diff options
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/xmon/xmon.c | 4371 |
1 files changed, 4371 insertions, 0 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c new file mode 100644 index 0000000000..b3b94cd377 --- /dev/null +++ b/arch/powerpc/xmon/xmon.c @@ -0,0 +1,4371 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Routines providing a simple monitor for use on the PowerMac. + * + * Copyright (C) 1996-2005 Paul Mackerras. + * Copyright (C) 2001 PPC64 Team, IBM Corp + * Copyrignt (C) 2006 Michael Ellerman, IBM Corp + */ + +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/sched/signal.h> +#include <linux/smp.h> +#include <linux/mm.h> +#include <linux/reboot.h> +#include <linux/delay.h> +#include <linux/kallsyms.h> +#include <linux/kmsg_dump.h> +#include <linux/cpumask.h> +#include <linux/export.h> +#include <linux/sysrq.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/bug.h> +#include <linux/nmi.h> +#include <linux/ctype.h> +#include <linux/highmem.h> +#include <linux/security.h> +#include <linux/debugfs.h> + +#include <asm/ptrace.h> +#include <asm/smp.h> +#include <asm/string.h> +#include <asm/machdep.h> +#include <asm/xmon.h> +#include <asm/processor.h> +#include <asm/mmu.h> +#include <asm/mmu_context.h> +#include <asm/plpar_wrappers.h> +#include <asm/cputable.h> +#include <asm/rtas.h> +#include <asm/sstep.h> +#include <asm/irq_regs.h> +#include <asm/spu.h> +#include <asm/spu_priv1.h> +#include <asm/setjmp.h> +#include <asm/reg.h> +#include <asm/debug.h> +#include <asm/hw_breakpoint.h> +#include <asm/xive.h> +#include <asm/opal.h> +#include <asm/firmware.h> +#include <asm/code-patching.h> +#include <asm/sections.h> +#include <asm/inst.h> +#include <asm/interrupt.h> + +#ifdef CONFIG_PPC64 +#include <asm/hvcall.h> +#include <asm/paca.h> +#include <asm/lppaca.h> +#endif + +#include "nonstdio.h" +#include "dis-asm.h" +#include "xmon_bpts.h" + +#ifdef CONFIG_SMP +static cpumask_t cpus_in_xmon = CPU_MASK_NONE; +static unsigned long xmon_taken = 1; +static int xmon_owner; +static int xmon_gate; +static int xmon_batch; +static unsigned long xmon_batch_start_cpu; +static cpumask_t xmon_batch_cpus = CPU_MASK_NONE; +#else +#define xmon_owner 0 +#endif /* CONFIG_SMP */ + +static unsigned long in_xmon __read_mostly = 0; +static int xmon_on = IS_ENABLED(CONFIG_XMON_DEFAULT); +static bool xmon_is_ro = IS_ENABLED(CONFIG_XMON_DEFAULT_RO_MODE); + +static unsigned long adrs; +static int size = 1; +#define MAX_DUMP (64 * 1024) +static unsigned long ndump = 64; +#define MAX_IDUMP (MAX_DUMP >> 2) +static unsigned long nidump = 16; +static unsigned long ncsum = 4096; +static int termch; +static char tmpstr[KSYM_NAME_LEN]; +static int tracing_enabled; + +static long bus_error_jmp[JMP_BUF_LEN]; +static int catch_memory_errors; +static int catch_spr_faults; +static long *xmon_fault_jmp[NR_CPUS]; + +/* Breakpoint stuff */ +struct bpt { + unsigned long address; + u32 *instr; + atomic_t ref_count; + int enabled; + unsigned long pad; +}; + +/* Bits in bpt.enabled */ +#define BP_CIABR 1 +#define BP_TRAP 2 +#define BP_DABR 4 + +static struct bpt bpts[NBPTS]; +static struct bpt dabr[HBP_NUM_MAX]; +static struct bpt *iabr; +static unsigned int bpinstr = PPC_RAW_TRAP(); + +#define BP_NUM(bp) ((bp) - bpts + 1) + +/* Prototypes */ +static int cmds(struct pt_regs *); +static int mread(unsigned long, void *, int); +static int mwrite(unsigned long, void *, int); +static int mread_instr(unsigned long, ppc_inst_t *); +static int handle_fault(struct pt_regs *); +static void byterev(unsigned char *, int); +static void memex(void); +static int bsesc(void); +static void dump(void); +static void show_pte(unsigned long); +static void prdump(unsigned long, long); +static int ppc_inst_dump(unsigned long, long, int); +static void dump_log_buf(void); + +#ifdef CONFIG_SMP +static int xmon_switch_cpu(unsigned long); +static int xmon_batch_next_cpu(void); +static int batch_cmds(struct pt_regs *); +#endif + +#ifdef CONFIG_PPC_POWERNV +static void dump_opal_msglog(void); +#else +static inline void dump_opal_msglog(void) +{ + printf("Machine is not running OPAL firmware.\n"); +} +#endif + +static void backtrace(struct pt_regs *); +static void excprint(struct pt_regs *); +static void prregs(struct pt_regs *); +static void memops(int); +static void memlocate(void); +static void memzcan(void); +static void memdiffs(unsigned char *, unsigned char *, unsigned, unsigned); +int skipbl(void); +int scanhex(unsigned long *valp); +static void scannl(void); +static int hexdigit(int); +void getstring(char *, int); +static void flush_input(void); +static int inchar(void); +static void take_input(char *); +static int read_spr(int, unsigned long *); +static void write_spr(int, unsigned long); +static void super_regs(void); +static void remove_bpts(void); +static void insert_bpts(void); +static void remove_cpu_bpts(void); +static void insert_cpu_bpts(void); +static struct bpt *at_breakpoint(unsigned long pc); +static struct bpt *in_breakpoint_table(unsigned long pc, unsigned long *offp); +static int do_step(struct pt_regs *); +static void bpt_cmds(void); +static void cacheflush(void); +static int cpu_cmd(void); +static void csum(void); +static void bootcmds(void); +static void proccall(void); +static void show_tasks(void); +void dump_segments(void); +static void symbol_lookup(void); +static void xmon_show_stack(unsigned long sp, unsigned long lr, + unsigned long pc); +static void xmon_print_symbol(unsigned long address, const char *mid, + const char *after); +static const char *getvecname(unsigned long vec); + +static int do_spu_cmd(void); + +#ifdef CONFIG_44x +static void dump_tlb_44x(void); +#endif +#ifdef CONFIG_PPC_BOOK3E_64 +static void dump_tlb_book3e(void); +#endif + +static void clear_all_bpt(void); + +#ifdef CONFIG_PPC64 +#define REG "%.16lx" +#else +#define REG "%.8lx" +#endif + +#ifdef __LITTLE_ENDIAN__ +#define GETWORD(v) (((v)[3] << 24) + ((v)[2] << 16) + ((v)[1] << 8) + (v)[0]) +#else +#define GETWORD(v) (((v)[0] << 24) + ((v)[1] << 16) + ((v)[2] << 8) + (v)[3]) +#endif + +static const char *xmon_ro_msg = "Operation disabled: xmon in read-only mode\n"; + +static char *help_string = "\ +Commands:\n\ + b show breakpoints\n\ + bd set data breakpoint\n\ + bi set instruction breakpoint\n\ + bc clear breakpoint\n" +#ifdef CONFIG_SMP + "\ + c print cpus stopped in xmon\n\ + c# try to switch to cpu number h (in hex)\n\ + c# $ run command '$' (one of 'r','S' or 't') on all cpus in xmon\n" +#endif + "\ + C checksum\n\ + d dump bytes\n\ + d1 dump 1 byte values\n\ + d2 dump 2 byte values\n\ + d4 dump 4 byte values\n\ + d8 dump 8 byte values\n\ + di dump instructions\n\ + df dump float values\n\ + dd dump double values\n\ + dl dump the kernel log buffer\n" +#ifdef CONFIG_PPC_POWERNV + "\ + do dump the OPAL message log\n" +#endif +#ifdef CONFIG_PPC64 + "\ + dp[#] dump paca for current cpu, or cpu #\n\ + dpa dump paca for all possible cpus\n" +#endif + "\ + dr dump stream of raw bytes\n\ + dv dump virtual address translation \n\ + dt dump the tracing buffers (uses printk)\n\ + dtc dump the tracing buffers for current CPU (uses printk)\n\ +" +#ifdef CONFIG_PPC_POWERNV +" dx# dump xive on CPU #\n\ + dxi# dump xive irq state #\n\ + dxa dump xive on all CPUs\n" +#endif +" e print exception information\n\ + f flush cache\n\ + la lookup symbol+offset of specified address\n\ + ls lookup address of specified symbol\n\ + lp s [#] lookup address of percpu symbol s for current cpu, or cpu #\n\ + m examine/change memory\n\ + mm move a block of memory\n\ + ms set a block of memory\n\ + md compare two blocks of memory\n\ + ml locate a block of memory\n\ + mz zero a block of memory\n\ + mi show information about memory allocation\n\ + p call a procedure\n\ + P list processes/tasks\n\ + r print registers\n\ + s single step\n" +#ifdef CONFIG_SPU_BASE +" ss stop execution on all spus\n\ + sr restore execution on stopped spus\n\ + sf # dump spu fields for spu # (in hex)\n\ + sd # dump spu local store for spu # (in hex)\n\ + sdi # disassemble spu local store for spu # (in hex)\n" +#endif +" S print special registers\n\ + Sa print all SPRs\n\ + Sr # read SPR #\n\ + Sw #v write v to SPR #\n\ + t print backtrace\n\ + x exit monitor and recover\n\ + X exit monitor and don't recover\n" +#if defined(CONFIG_PPC_BOOK3S_64) +" u dump segment table or SLB\n" +#elif defined(CONFIG_PPC_BOOK3S_32) +" u dump segment registers\n" +#elif defined(CONFIG_44x) || defined(CONFIG_PPC_BOOK3E_64) +" u dump TLB\n" +#endif +" U show uptime information\n" +" ? help\n" +" # n limit output to n lines per page (for dp, dpa, dl)\n" +" zr reboot\n" +" zh halt\n" +; + +#ifdef CONFIG_SECURITY +static bool xmon_is_locked_down(void) +{ + static bool lockdown; + + if (!lockdown) { + lockdown = !!security_locked_down(LOCKDOWN_XMON_RW); + if (lockdown) { + printf("xmon: Disabled due to kernel lockdown\n"); + xmon_is_ro = true; + } + } + + if (!xmon_is_ro) { + xmon_is_ro = !!security_locked_down(LOCKDOWN_XMON_WR); + if (xmon_is_ro) + printf("xmon: Read-only due to kernel lockdown\n"); + } + + return lockdown; +} +#else /* CONFIG_SECURITY */ +static inline bool xmon_is_locked_down(void) +{ + return false; +} +#endif + +static struct pt_regs *xmon_regs; + +static inline void sync(void) +{ + asm volatile("sync; isync"); +} + +static inline void cflush(void *p) +{ + asm volatile ("dcbf 0,%0; icbi 0,%0" : : "r" (p)); +} + +static inline void cinval(void *p) +{ + asm volatile ("dcbi 0,%0; icbi 0,%0" : : "r" (p)); +} + +/** + * write_ciabr() - write the CIABR SPR + * @ciabr: The value to write. + * + * This function writes a value to the CIARB register either directly + * through mtspr instruction if the kernel is in HV privilege mode or + * call a hypervisor function to achieve the same in case the kernel + * is in supervisor privilege mode. + */ +static void write_ciabr(unsigned long ciabr) +{ + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return; + + if (cpu_has_feature(CPU_FTR_HVMODE)) { + mtspr(SPRN_CIABR, ciabr); + return; + } + plpar_set_ciabr(ciabr); +} + +/** + * set_ciabr() - set the CIABR + * @addr: The value to set. + * + * This function sets the correct privilege value into the HW + * breakpoint address before writing it up in the CIABR register. + */ +static void set_ciabr(unsigned long addr) +{ + addr &= ~CIABR_PRIV; + + if (cpu_has_feature(CPU_FTR_HVMODE)) + addr |= CIABR_PRIV_HYPER; + else + addr |= CIABR_PRIV_SUPER; + write_ciabr(addr); +} + +/* + * Disable surveillance (the service processor watchdog function) + * while we are in xmon. + * XXX we should re-enable it when we leave. :) + */ +#define SURVEILLANCE_TOKEN 9000 + +static inline void disable_surveillance(void) +{ +#ifdef CONFIG_PPC_PSERIES + /* Since this can't be a module, args should end up below 4GB. */ + static struct rtas_args args; + const s32 token = rtas_function_token(RTAS_FN_SET_INDICATOR); + + /* + * At this point we have got all the cpus we can into + * xmon, so there is hopefully no other cpu calling RTAS + * at the moment, even though we don't take rtas.lock. + * If we did try to take rtas.lock there would be a + * real possibility of deadlock. + */ + if (token == RTAS_UNKNOWN_SERVICE) + return; + + rtas_call_unlocked(&args, token, 3, 1, NULL, + SURVEILLANCE_TOKEN, 0, 0); + +#endif /* CONFIG_PPC_PSERIES */ +} + +#ifdef CONFIG_SMP +static int xmon_speaker; + +static void get_output_lock(void) +{ + int me = smp_processor_id() + 0x100; + int last_speaker = 0, prev; + long timeout; + + if (xmon_speaker == me) + return; + + for (;;) { + last_speaker = cmpxchg(&xmon_speaker, 0, me); + if (last_speaker == 0) + return; + + /* + * Wait a full second for the lock, we might be on a slow + * console, but check every 100us. + */ + timeout = 10000; + while (xmon_speaker == last_speaker) { + if (--timeout > 0) { + udelay(100); + continue; + } + + /* hostile takeover */ + prev = cmpxchg(&xmon_speaker, last_speaker, me); + if (prev == last_speaker) + return; + break; + } + } +} + +static void release_output_lock(void) +{ + xmon_speaker = 0; +} + +int cpus_are_in_xmon(void) +{ + return !cpumask_empty(&cpus_in_xmon); +} + +static bool wait_for_other_cpus(int ncpus) +{ + unsigned long timeout; + + /* We wait for 2s, which is a metric "little while" */ + for (timeout = 20000; timeout != 0; --timeout) { + if (cpumask_weight(&cpus_in_xmon) >= ncpus) + return true; + udelay(100); + barrier(); + } + + return false; +} +#else /* CONFIG_SMP */ +static inline void get_output_lock(void) {} +static inline void release_output_lock(void) {} +#endif + +static void xmon_touch_watchdogs(void) +{ + touch_softlockup_watchdog_sync(); + rcu_cpu_stall_reset(); + touch_nmi_watchdog(); +} + +static int xmon_core(struct pt_regs *regs, volatile int fromipi) +{ + volatile int cmd = 0; + struct bpt *volatile bp; + long recurse_jmp[JMP_BUF_LEN]; + bool locked_down; + unsigned long offset; + unsigned long flags; +#ifdef CONFIG_SMP + int cpu; + int secondary; +#endif + + local_irq_save(flags); + hard_irq_disable(); + + locked_down = xmon_is_locked_down(); + + if (!fromipi) { + tracing_enabled = tracing_is_on(); + tracing_off(); + } + + bp = in_breakpoint_table(regs->nip, &offset); + if (bp != NULL) { + regs_set_return_ip(regs, bp->address + offset); + atomic_dec(&bp->ref_count); + } + + remove_cpu_bpts(); + +#ifdef CONFIG_SMP + cpu = smp_processor_id(); + if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { + /* + * We catch SPR read/write faults here because the 0x700, 0xf60 + * etc. handlers don't call debugger_fault_handler(). + */ + if (catch_spr_faults) + longjmp(bus_error_jmp, 1); + get_output_lock(); + excprint(regs); + printf("cpu 0x%x: Exception %lx %s in xmon, " + "returning to main loop\n", + cpu, regs->trap, getvecname(TRAP(regs))); + release_output_lock(); + longjmp(xmon_fault_jmp[cpu], 1); + } + + if (setjmp(recurse_jmp) != 0) { + if (!in_xmon || !xmon_gate) { + get_output_lock(); + printf("xmon: WARNING: bad recursive fault " + "on cpu 0x%x\n", cpu); + release_output_lock(); + goto waiting; + } + secondary = !(xmon_taken && cpu == xmon_owner); + goto cmdloop; + } + + xmon_fault_jmp[cpu] = recurse_jmp; + + bp = NULL; + if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) + bp = at_breakpoint(regs->nip); + if (bp || regs_is_unrecoverable(regs)) + fromipi = 0; + + if (!fromipi) { + get_output_lock(); + if (!locked_down) + excprint(regs); + if (bp) { + printf("cpu 0x%x stopped at breakpoint 0x%tx (", + cpu, BP_NUM(bp)); + xmon_print_symbol(regs->nip, " ", ")\n"); + } + if (regs_is_unrecoverable(regs)) + printf("WARNING: exception is not recoverable, " + "can't continue\n"); + release_output_lock(); + } + + cpumask_set_cpu(cpu, &cpus_in_xmon); + + waiting: + secondary = 1; + spin_begin(); + while (secondary && !xmon_gate) { + if (in_xmon == 0) { + if (fromipi) { + spin_end(); + goto leave; + } + secondary = test_and_set_bit(0, &in_xmon); + } + spin_cpu_relax(); + touch_nmi_watchdog(); + } + spin_end(); + + if (!secondary && !xmon_gate) { + /* we are the first cpu to come in */ + /* interrupt other cpu(s) */ + int ncpus = num_online_cpus(); + + xmon_owner = cpu; + mb(); + if (ncpus > 1) { + /* + * A system reset (trap == 0x100) can be triggered on + * all CPUs, so when we come in via 0x100 try waiting + * for the other CPUs to come in before we send the + * debugger break (IPI). This is similar to + * crash_kexec_secondary(). + */ + if (TRAP(regs) != INTERRUPT_SYSTEM_RESET || !wait_for_other_cpus(ncpus)) + smp_send_debugger_break(); + + wait_for_other_cpus(ncpus); + } + remove_bpts(); + disable_surveillance(); + + if (!locked_down) { + /* for breakpoint or single step, print curr insn */ + if (bp || TRAP(regs) == INTERRUPT_TRACE) + ppc_inst_dump(regs->nip, 1, 0); + printf("enter ? for help\n"); + } + + mb(); + xmon_gate = 1; + barrier(); + touch_nmi_watchdog(); + } + + cmdloop: + while (in_xmon) { + if (secondary) { + spin_begin(); + if (cpu == xmon_owner) { + if (!test_and_set_bit(0, &xmon_taken)) { + secondary = 0; + spin_end(); + continue; + } + /* missed it */ + while (cpu == xmon_owner) + spin_cpu_relax(); + } + spin_cpu_relax(); + touch_nmi_watchdog(); + } else { + cmd = 1; +#ifdef CONFIG_SMP + if (xmon_batch) + cmd = batch_cmds(regs); +#endif + if (!locked_down && cmd) + cmd = cmds(regs); + if (locked_down || cmd != 0) { + /* exiting xmon */ + insert_bpts(); + xmon_gate = 0; + wmb(); + in_xmon = 0; + break; + } + /* have switched to some other cpu */ + secondary = 1; + } + } + leave: + cpumask_clear_cpu(cpu, &cpus_in_xmon); + xmon_fault_jmp[cpu] = NULL; +#else + /* UP is simple... */ + if (in_xmon) { + printf("Exception %lx %s in xmon, returning to main loop\n", + regs->trap, getvecname(TRAP(regs))); + longjmp(xmon_fault_jmp[0], 1); + } + if (setjmp(recurse_jmp) == 0) { + xmon_fault_jmp[0] = recurse_jmp; + in_xmon = 1; + + excprint(regs); + bp = at_breakpoint(regs->nip); + if (bp) { + printf("Stopped at breakpoint %tx (", BP_NUM(bp)); + xmon_print_symbol(regs->nip, " ", ")\n"); + } + if (regs_is_unrecoverable(regs)) + printf("WARNING: exception is not recoverable, " + "can't continue\n"); + remove_bpts(); + disable_surveillance(); + if (!locked_down) { + /* for breakpoint or single step, print current insn */ + if (bp || TRAP(regs) == INTERRUPT_TRACE) + ppc_inst_dump(regs->nip, 1, 0); + printf("enter ? for help\n"); + } + } + + if (!locked_down) + cmd = cmds(regs); + + insert_bpts(); + in_xmon = 0; +#endif + +#ifdef CONFIG_BOOKE + if (regs->msr & MSR_DE) { + bp = at_breakpoint(regs->nip); + if (bp != NULL) { + regs_set_return_ip(regs, (unsigned long) &bp->instr[0]); + atomic_inc(&bp->ref_count); + } + } +#else + if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { + bp = at_breakpoint(regs->nip); + if (bp != NULL) { + int stepped = emulate_step(regs, ppc_inst_read(bp->instr)); + if (stepped == 0) { + regs_set_return_ip(regs, (unsigned long) &bp->instr[0]); + atomic_inc(&bp->ref_count); + } else if (stepped < 0) { + printf("Couldn't single-step %s instruction\n", + IS_RFID(ppc_inst_read(bp->instr))? "rfid": "mtmsrd"); + } + } + } +#endif + if (locked_down) + clear_all_bpt(); + else + insert_cpu_bpts(); + + xmon_touch_watchdogs(); + local_irq_restore(flags); + + return cmd != 'X' && cmd != EOF; +} + +int xmon(struct pt_regs *excp) +{ + struct pt_regs regs; + + if (excp == NULL) { + ppc_save_regs(®s); + excp = ®s; + } + + return xmon_core(excp, 0); +} +EXPORT_SYMBOL(xmon); + +irqreturn_t xmon_irq(int irq, void *d) +{ + unsigned long flags; + local_irq_save(flags); + printf("Keyboard interrupt\n"); + xmon(get_irq_regs()); + local_irq_restore(flags); + return IRQ_HANDLED; +} + +static int xmon_bpt(struct pt_regs *regs) +{ + struct bpt *bp; + unsigned long offset; + + if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) + return 0; + + /* Are we at the trap at bp->instr[1] for some bp? */ + bp = in_breakpoint_table(regs->nip, &offset); + if (bp != NULL && (offset == 4 || offset == 8)) { + regs_set_return_ip(regs, bp->address + offset); + atomic_dec(&bp->ref_count); + return 1; + } + + /* Are we at a breakpoint? */ + bp = at_breakpoint(regs->nip); + if (!bp) + return 0; + + xmon_core(regs, 0); + + return 1; +} + +static int xmon_sstep(struct pt_regs *regs) +{ + if (user_mode(regs)) + return 0; + xmon_core(regs, 0); + return 1; +} + +static int xmon_break_match(struct pt_regs *regs) +{ + int i; + + if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) + return 0; + for (i = 0; i < nr_wp_slots(); i++) { + if (dabr[i].enabled) + goto found; + } + return 0; + +found: + xmon_core(regs, 0); + return 1; +} + +static int xmon_iabr_match(struct pt_regs *regs) +{ + if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) != (MSR_IR|MSR_64BIT)) + return 0; + if (iabr == NULL) + return 0; + xmon_core(regs, 0); + return 1; +} + +static int xmon_ipi(struct pt_regs *regs) +{ +#ifdef CONFIG_SMP + if (in_xmon && !cpumask_test_cpu(smp_processor_id(), &cpus_in_xmon)) + xmon_core(regs, 1); +#endif + return 0; +} + +static int xmon_fault_handler(struct pt_regs *regs) +{ + struct bpt *bp; + unsigned long offset; + + if (in_xmon && catch_memory_errors) + handle_fault(regs); /* doesn't return */ + + if ((regs->msr & (MSR_IR|MSR_PR|MSR_64BIT)) == (MSR_IR|MSR_64BIT)) { + bp = in_breakpoint_table(regs->nip, &offset); + if (bp != NULL) { + regs_set_return_ip(regs, bp->address + offset); + atomic_dec(&bp->ref_count); + } + } + + return 0; +} + +/* Force enable xmon if not already enabled */ +static inline void force_enable_xmon(void) +{ + /* Enable xmon hooks if needed */ + if (!xmon_on) { + printf("xmon: Enabling debugger hooks\n"); + xmon_on = 1; + } +} + +static struct bpt *at_breakpoint(unsigned long pc) +{ + int i; + struct bpt *volatile bp; + + bp = bpts; + for (i = 0; i < NBPTS; ++i, ++bp) + if (bp->enabled && pc == bp->address) + return bp; + return NULL; +} + +static struct bpt *in_breakpoint_table(unsigned long nip, unsigned long *offp) +{ + unsigned long off; + + off = nip - (unsigned long)bpt_table; + if (off >= sizeof(bpt_table)) + return NULL; + *offp = off & (BPT_SIZE - 1); + if (off & 3) + return NULL; + return bpts + (off / BPT_SIZE); +} + +static struct bpt *new_breakpoint(unsigned long a) +{ + struct bpt *bp; + + a &= ~3UL; + bp = at_breakpoint(a); + if (bp) + return bp; + + for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { + if (!bp->enabled && atomic_read(&bp->ref_count) == 0) { + bp->address = a; + bp->instr = (void *)(bpt_table + ((bp - bpts) * BPT_WORDS)); + return bp; + } + } + + printf("Sorry, no free breakpoints. Please clear one first.\n"); + return NULL; +} + +static void insert_bpts(void) +{ + int i; + ppc_inst_t instr, instr2; + struct bpt *bp, *bp2; + + bp = bpts; + for (i = 0; i < NBPTS; ++i, ++bp) { + if ((bp->enabled & (BP_TRAP|BP_CIABR)) == 0) + continue; + if (!mread_instr(bp->address, &instr)) { + printf("Couldn't read instruction at %lx, " + "disabling breakpoint there\n", bp->address); + bp->enabled = 0; + continue; + } + if (!can_single_step(ppc_inst_val(instr))) { + printf("Breakpoint at %lx is on an instruction that can't be single stepped, disabling it\n", + bp->address); + bp->enabled = 0; + continue; + } + /* + * Check the address is not a suffix by looking for a prefix in + * front of it. + */ + if (mread_instr(bp->address - 4, &instr2) == 8) { + printf("Breakpoint at %lx is on the second word of a prefixed instruction, disabling it\n", + bp->address); + bp->enabled = 0; + continue; + } + /* + * We might still be a suffix - if the prefix has already been + * replaced by a breakpoint we won't catch it with the above + * test. + */ + bp2 = at_breakpoint(bp->address - 4); + if (bp2 && ppc_inst_prefixed(ppc_inst_read(bp2->instr))) { + printf("Breakpoint at %lx is on the second word of a prefixed instruction, disabling it\n", + bp->address); + bp->enabled = 0; + continue; + } + + patch_instruction(bp->instr, instr); + patch_instruction(ppc_inst_next(bp->instr, bp->instr), + ppc_inst(bpinstr)); + if (bp->enabled & BP_CIABR) + continue; + if (patch_instruction((u32 *)bp->address, + ppc_inst(bpinstr)) != 0) { + printf("Couldn't write instruction at %lx, " + "disabling breakpoint there\n", bp->address); + bp->enabled &= ~BP_TRAP; + continue; + } + } +} + +static void insert_cpu_bpts(void) +{ + int i; + struct arch_hw_breakpoint brk; + + for (i = 0; i < nr_wp_slots(); i++) { + if (dabr[i].enabled) { + brk.address = dabr[i].address; + brk.type = (dabr[i].enabled & HW_BRK_TYPE_DABR) | HW_BRK_TYPE_PRIV_ALL; + brk.len = 8; + brk.hw_len = 8; + __set_breakpoint(i, &brk); + } + } + + if (iabr) + set_ciabr(iabr->address); +} + +static void remove_bpts(void) +{ + int i; + struct bpt *bp; + ppc_inst_t instr; + + bp = bpts; + for (i = 0; i < NBPTS; ++i, ++bp) { + if ((bp->enabled & (BP_TRAP|BP_CIABR)) != BP_TRAP) + continue; + if (mread_instr(bp->address, &instr) + && ppc_inst_equal(instr, ppc_inst(bpinstr)) + && patch_instruction( + (u32 *)bp->address, ppc_inst_read(bp->instr)) != 0) + printf("Couldn't remove breakpoint at %lx\n", + bp->address); + } +} + +static void remove_cpu_bpts(void) +{ + hw_breakpoint_disable(); + write_ciabr(0); +} + +/* Based on uptime_proc_show(). */ +static void +show_uptime(void) +{ + struct timespec64 uptime; + + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + + ktime_get_coarse_boottime_ts64(&uptime); + printf("Uptime: %lu.%.2lu seconds\n", (unsigned long)uptime.tv_sec, + ((unsigned long)uptime.tv_nsec / (NSEC_PER_SEC/100))); + + sync(); + __delay(200); \ + } + catch_memory_errors = 0; +} + +static void set_lpp_cmd(void) +{ + unsigned long lpp; + + if (!scanhex(&lpp)) { + printf("Invalid number.\n"); + lpp = 0; + } + xmon_set_pagination_lpp(lpp); +} +/* Command interpreting routine */ +static char *last_cmd; + +static int +cmds(struct pt_regs *excp) +{ + int cmd = 0; + + last_cmd = NULL; + xmon_regs = excp; + + xmon_show_stack(excp->gpr[1], excp->link, excp->nip); + + for(;;) { +#ifdef CONFIG_SMP + printf("%x:", smp_processor_id()); +#endif /* CONFIG_SMP */ + printf("mon> "); + flush_input(); + termch = 0; + cmd = skipbl(); + if( cmd == '\n' ) { + if (last_cmd == NULL) + continue; + take_input(last_cmd); + last_cmd = NULL; + cmd = inchar(); + } + switch (cmd) { + case 'm': + cmd = inchar(); + switch (cmd) { + case 'm': + case 's': + case 'd': + memops(cmd); + break; + case 'l': + memlocate(); + break; + case 'z': + if (xmon_is_ro) { + printf(xmon_ro_msg); + break; + } + memzcan(); + break; + case 'i': + show_mem(); + break; + default: + termch = cmd; + memex(); + } + break; + case 'd': + dump(); + break; + case 'l': + symbol_lookup(); + break; + case 'r': + prregs(excp); /* print regs */ + break; + case 'e': + excprint(excp); + break; + case 'S': + super_regs(); + break; + case 't': + backtrace(excp); + break; + case 'f': + cacheflush(); + break; + case 's': + if (do_spu_cmd() == 0) + break; + if (do_step(excp)) + return cmd; + break; + case 'x': + case 'X': + if (tracing_enabled) + tracing_on(); + return cmd; + case EOF: + printf(" <no input ...>\n"); + mdelay(2000); + return cmd; + case '?': + xmon_puts(help_string); + break; + case '#': + set_lpp_cmd(); + break; + case 'b': + bpt_cmds(); + break; + case 'C': + csum(); + break; + case 'c': + if (cpu_cmd()) + return 0; + break; + case 'z': + bootcmds(); + break; + case 'p': + if (xmon_is_ro) { + printf(xmon_ro_msg); + break; + } + proccall(); + break; + case 'P': + show_tasks(); + break; +#if defined(CONFIG_PPC_BOOK3S_32) || defined(CONFIG_PPC_64S_HASH_MMU) + case 'u': + dump_segments(); + break; +#elif defined(CONFIG_44x) + case 'u': + dump_tlb_44x(); + break; +#elif defined(CONFIG_PPC_BOOK3E_64) + case 'u': + dump_tlb_book3e(); + break; +#endif + case 'U': + show_uptime(); + break; + default: + printf("Unrecognized command: "); + do { + if (' ' < cmd && cmd <= '~') + putchar(cmd); + else + printf("\\x%x", cmd); + cmd = inchar(); + } while (cmd != '\n'); + printf(" (type ? for help)\n"); + break; + } + } +} + +#ifdef CONFIG_BOOKE +static int do_step(struct pt_regs *regs) +{ + regs_set_return_msr(regs, regs->msr | MSR_DE); + mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) | DBCR0_IC | DBCR0_IDM); + return 1; +} +#else +/* + * Step a single instruction. + * Some instructions we emulate, others we execute with MSR_SE set. + */ +static int do_step(struct pt_regs *regs) +{ + ppc_inst_t instr; + int stepped; + + force_enable_xmon(); + /* check we are in 64-bit kernel mode, translation enabled */ + if ((regs->msr & (MSR_64BIT|MSR_PR|MSR_IR)) == (MSR_64BIT|MSR_IR)) { + if (mread_instr(regs->nip, &instr)) { + stepped = emulate_step(regs, instr); + if (stepped < 0) { + printf("Couldn't single-step %s instruction\n", + (IS_RFID(instr)? "rfid": "mtmsrd")); + return 0; + } + if (stepped > 0) { + set_trap(regs, 0xd00); + printf("stepped to "); + xmon_print_symbol(regs->nip, " ", "\n"); + ppc_inst_dump(regs->nip, 1, 0); + return 0; + } + } + } + regs_set_return_msr(regs, regs->msr | MSR_SE); + return 1; +} +#endif + +static void bootcmds(void) +{ + char tmp[64]; + int cmd; + + cmd = inchar(); + if (cmd == 'r') { + getstring(tmp, 64); + ppc_md.restart(tmp); + } else if (cmd == 'h') { + ppc_md.halt(); + } else if (cmd == 'p') { + do_kernel_power_off(); + } +} + +#ifdef CONFIG_SMP +static int xmon_switch_cpu(unsigned long cpu) +{ + int timeout; + + xmon_taken = 0; + mb(); + xmon_owner = cpu; + timeout = 10000000; + while (!xmon_taken) { + if (--timeout == 0) { + if (test_and_set_bit(0, &xmon_taken)) + break; + /* take control back */ + mb(); + xmon_owner = smp_processor_id(); + printf("cpu 0x%lx didn't take control\n", cpu); + return 0; + } + barrier(); + } + return 1; +} + +static int xmon_batch_next_cpu(void) +{ + unsigned long cpu; + + while (!cpumask_empty(&xmon_batch_cpus)) { + cpu = cpumask_next_wrap(smp_processor_id(), &xmon_batch_cpus, + xmon_batch_start_cpu, true); + if (cpu >= nr_cpu_ids) + break; + if (xmon_batch_start_cpu == -1) + xmon_batch_start_cpu = cpu; + if (xmon_switch_cpu(cpu)) + return 0; + cpumask_clear_cpu(cpu, &xmon_batch_cpus); + } + + xmon_batch = 0; + printf("%x:mon> \n", smp_processor_id()); + return 1; +} + +static int batch_cmds(struct pt_regs *excp) +{ + int cmd; + + /* simulate command entry */ + cmd = xmon_batch; + termch = '\n'; + + last_cmd = NULL; + xmon_regs = excp; + + printf("%x:", smp_processor_id()); + printf("mon> "); + printf("%c\n", (char)cmd); + + switch (cmd) { + case 'r': + prregs(excp); /* print regs */ + break; + case 'S': + super_regs(); + break; + case 't': + backtrace(excp); + break; + } + + cpumask_clear_cpu(smp_processor_id(), &xmon_batch_cpus); + + return xmon_batch_next_cpu(); +} + +static int cpu_cmd(void) +{ + unsigned long cpu, first_cpu, last_cpu; + + cpu = skipbl(); + if (cpu == '#') { + xmon_batch = skipbl(); + if (xmon_batch) { + switch (xmon_batch) { + case 'r': + case 'S': + case 't': + cpumask_copy(&xmon_batch_cpus, &cpus_in_xmon); + if (cpumask_weight(&xmon_batch_cpus) <= 1) { + printf("There are no other cpus in xmon\n"); + break; + } + xmon_batch_start_cpu = -1; + if (!xmon_batch_next_cpu()) + return 1; + break; + default: + printf("c# only supports 'r', 'S' and 't' commands\n"); + } + xmon_batch = 0; + return 0; + } + } + termch = cpu; + + if (!scanhex(&cpu)) { + /* print cpus waiting or in xmon */ + printf("cpus stopped:"); + last_cpu = first_cpu = NR_CPUS; + for_each_possible_cpu(cpu) { + if (cpumask_test_cpu(cpu, &cpus_in_xmon)) { + if (cpu == last_cpu + 1) { + last_cpu = cpu; + } else { + if (last_cpu != first_cpu) + printf("-0x%lx", last_cpu); + last_cpu = first_cpu = cpu; + printf(" 0x%lx", cpu); + } + } + } + if (last_cpu != first_cpu) + printf("-0x%lx", last_cpu); + printf("\n"); + return 0; + } + /* try to switch to cpu specified */ + if (!cpumask_test_cpu(cpu, &cpus_in_xmon)) { + printf("cpu 0x%lx isn't in xmon\n", cpu); +#ifdef CONFIG_PPC64 + printf("backtrace of paca[0x%lx].saved_r1 (possibly stale):\n", cpu); + xmon_show_stack(paca_ptrs[cpu]->saved_r1, 0, 0); +#endif + return 0; + } + + return xmon_switch_cpu(cpu); +} +#else +static int cpu_cmd(void) +{ + return 0; +} +#endif /* CONFIG_SMP */ + +static unsigned short fcstab[256] = { + 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, + 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, + 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, + 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, + 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, + 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, + 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, + 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, + 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, + 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, + 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, + 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, + 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, + 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, + 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, + 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, + 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, + 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, + 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, + 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, + 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, + 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, + 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, + 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, + 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, + 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, + 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, + 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, + 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, + 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, + 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, + 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; + +#define FCS(fcs, c) (((fcs) >> 8) ^ fcstab[((fcs) ^ (c)) & 0xff]) + +static void +csum(void) +{ + unsigned int i; + unsigned short fcs; + unsigned char v; + + if (!scanhex(&adrs)) + return; + if (!scanhex(&ncsum)) + return; + fcs = 0xffff; + for (i = 0; i < ncsum; ++i) { + if (mread(adrs+i, &v, 1) == 0) { + printf("csum stopped at "REG"\n", adrs+i); + break; + } + fcs = FCS(fcs, v); + } + printf("%x\n", fcs); +} + +/* + * Check if this is a suitable place to put a breakpoint. + */ +static long check_bp_loc(unsigned long addr) +{ + ppc_inst_t instr; + + addr &= ~3; + if (!is_kernel_addr(addr)) { + printf("Breakpoints may only be placed at kernel addresses\n"); + return 0; + } + if (!mread_instr(addr, &instr)) { + printf("Can't read instruction at address %lx\n", addr); + return 0; + } + if (!can_single_step(ppc_inst_val(instr))) { + printf("Breakpoints may not be placed on instructions that can't be single stepped\n"); + return 0; + } + return 1; +} + +static int find_free_data_bpt(void) +{ + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (!dabr[i].enabled) + return i; + } + printf("Couldn't find free breakpoint register\n"); + return -1; +} + +static void print_data_bpts(void) +{ + int i; + + for (i = 0; i < nr_wp_slots(); i++) { + if (!dabr[i].enabled) + continue; + + printf(" data "REG" [", dabr[i].address); + if (dabr[i].enabled & 1) + printf("r"); + if (dabr[i].enabled & 2) + printf("w"); + printf("]\n"); + } +} + +static char *breakpoint_help_string = + "Breakpoint command usage:\n" + "b show breakpoints\n" + "b <addr> [cnt] set breakpoint at given instr addr\n" + "bc clear all breakpoints\n" + "bc <n/addr> clear breakpoint number n or at addr\n" + "bi <addr> [cnt] set hardware instr breakpoint (POWER8 only)\n" + "bd <addr> [cnt] set hardware data breakpoint\n" + ""; + +static void +bpt_cmds(void) +{ + int cmd; + unsigned long a; + int i; + struct bpt *bp; + + cmd = inchar(); + + switch (cmd) { + case 'd': { /* bd - hardware data breakpoint */ + static const char badaddr[] = "Only kernel addresses are permitted for breakpoints\n"; + int mode; + if (xmon_is_ro) { + printf(xmon_ro_msg); + break; + } + if (!ppc_breakpoint_available()) { + printf("Hardware data breakpoint not supported on this cpu\n"); + break; + } + i = find_free_data_bpt(); + if (i < 0) + break; + mode = 7; + cmd = inchar(); + if (cmd == 'r') + mode = 5; + else if (cmd == 'w') + mode = 6; + else + termch = cmd; + dabr[i].address = 0; + dabr[i].enabled = 0; + if (scanhex(&dabr[i].address)) { + if (!is_kernel_addr(dabr[i].address)) { + printf(badaddr); + break; + } + dabr[i].address &= ~HW_BRK_TYPE_DABR; + dabr[i].enabled = mode | BP_DABR; + } + + force_enable_xmon(); + break; + } + + case 'i': /* bi - hardware instr breakpoint */ + if (xmon_is_ro) { + printf(xmon_ro_msg); + break; + } + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) { + printf("Hardware instruction breakpoint " + "not supported on this cpu\n"); + break; + } + if (iabr) { + iabr->enabled &= ~BP_CIABR; + iabr = NULL; + } + if (!scanhex(&a)) + break; + if (!check_bp_loc(a)) + break; + bp = new_breakpoint(a); + if (bp != NULL) { + bp->enabled |= BP_CIABR; + iabr = bp; + force_enable_xmon(); + } + break; + + case 'c': + if (!scanhex(&a)) { + /* clear all breakpoints */ + for (i = 0; i < NBPTS; ++i) + bpts[i].enabled = 0; + iabr = NULL; + for (i = 0; i < nr_wp_slots(); i++) + dabr[i].enabled = 0; + + printf("All breakpoints cleared\n"); + break; + } + + if (a <= NBPTS && a >= 1) { + /* assume a breakpoint number */ + bp = &bpts[a-1]; /* bp nums are 1 based */ + } else { + /* assume a breakpoint address */ + bp = at_breakpoint(a); + if (bp == NULL) { + printf("No breakpoint at %lx\n", a); + break; + } + } + + printf("Cleared breakpoint %tx (", BP_NUM(bp)); + xmon_print_symbol(bp->address, " ", ")\n"); + bp->enabled = 0; + break; + + default: + termch = cmd; + cmd = skipbl(); + if (cmd == '?') { + printf(breakpoint_help_string); + break; + } + termch = cmd; + + if (xmon_is_ro || !scanhex(&a)) { + /* print all breakpoints */ + printf(" type address\n"); + print_data_bpts(); + for (bp = bpts; bp < &bpts[NBPTS]; ++bp) { + if (!bp->enabled) + continue; + printf("%tx %s ", BP_NUM(bp), + (bp->enabled & BP_CIABR) ? "inst": "trap"); + xmon_print_symbol(bp->address, " ", "\n"); + } + break; + } + + if (!check_bp_loc(a)) + break; + bp = new_breakpoint(a); + if (bp != NULL) { + bp->enabled |= BP_TRAP; + force_enable_xmon(); + } + break; + } +} + +/* Very cheap human name for vector lookup. */ +static +const char *getvecname(unsigned long vec) +{ + char *ret; + + switch (vec) { + case 0x100: ret = "(System Reset)"; break; + case 0x200: ret = "(Machine Check)"; break; + case 0x300: ret = "(Data Access)"; break; + case 0x380: + if (radix_enabled()) + ret = "(Data Access Out of Range)"; + else + ret = "(Data SLB Access)"; + break; + case 0x400: ret = "(Instruction Access)"; break; + case 0x480: + if (radix_enabled()) + ret = "(Instruction Access Out of Range)"; + else + ret = "(Instruction SLB Access)"; + break; + case 0x500: ret = "(Hardware Interrupt)"; break; + case 0x600: ret = "(Alignment)"; break; + case 0x700: ret = "(Program Check)"; break; + case 0x800: ret = "(FPU Unavailable)"; break; + case 0x900: ret = "(Decrementer)"; break; + case 0x980: ret = "(Hypervisor Decrementer)"; break; + case 0xa00: ret = "(Doorbell)"; break; + case 0xc00: ret = "(System Call)"; break; + case 0xd00: ret = "(Single Step)"; break; + case 0xe40: ret = "(Emulation Assist)"; break; + case 0xe60: ret = "(HMI)"; break; + case 0xe80: ret = "(Hypervisor Doorbell)"; break; + case 0xf00: ret = "(Performance Monitor)"; break; + case 0xf20: ret = "(Altivec Unavailable)"; break; + case 0x1300: ret = "(Instruction Breakpoint)"; break; + case 0x1500: ret = "(Denormalisation)"; break; + case 0x1700: ret = "(Altivec Assist)"; break; + case 0x3000: ret = "(System Call Vectored)"; break; + default: ret = ""; + } + return ret; +} + +static void get_function_bounds(unsigned long pc, unsigned long *startp, + unsigned long *endp) +{ + unsigned long size, offset; + const char *name; + + *startp = *endp = 0; + if (pc == 0) + return; + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + name = kallsyms_lookup(pc, &size, &offset, NULL, tmpstr); + if (name != NULL) { + *startp = pc - offset; + *endp = pc - offset + size; + } + sync(); + } + catch_memory_errors = 0; +} + +#define LRSAVE_OFFSET (STACK_FRAME_LR_SAVE * sizeof(unsigned long)) + +static void xmon_show_stack(unsigned long sp, unsigned long lr, + unsigned long pc) +{ + int max_to_print = 64; + unsigned long ip; + unsigned long newsp; + unsigned long marker; + struct pt_regs regs; + + while (max_to_print--) { + if (!is_kernel_addr(sp)) { + if (sp != 0) + printf("SP (%lx) is in userspace\n", sp); + break; + } + + if (!mread(sp + LRSAVE_OFFSET, &ip, sizeof(unsigned long)) + || !mread(sp, &newsp, sizeof(unsigned long))) { + printf("Couldn't read stack frame at %lx\n", sp); + break; + } + + /* + * For the first stack frame, try to work out if + * LR and/or the saved LR value in the bottommost + * stack frame are valid. + */ + if ((pc | lr) != 0) { + unsigned long fnstart, fnend; + unsigned long nextip; + int printip = 1; + + get_function_bounds(pc, &fnstart, &fnend); + nextip = 0; + if (newsp > sp) + mread(newsp + LRSAVE_OFFSET, &nextip, + sizeof(unsigned long)); + if (lr == ip) { + if (!is_kernel_addr(lr) + || (fnstart <= lr && lr < fnend)) + printip = 0; + } else if (lr == nextip) { + printip = 0; + } else if (is_kernel_addr(lr) + && !(fnstart <= lr && lr < fnend)) { + printf("[link register ] "); + xmon_print_symbol(lr, " ", "\n"); + } + if (printip) { + printf("["REG"] ", sp); + xmon_print_symbol(ip, " ", " (unreliable)\n"); + } + pc = lr = 0; + + } else { + printf("["REG"] ", sp); + xmon_print_symbol(ip, " ", "\n"); + } + + /* Look for "regs" marker to see if this is + an exception frame. */ + if (mread(sp + STACK_INT_FRAME_MARKER, &marker, sizeof(unsigned long)) + && marker == STACK_FRAME_REGS_MARKER) { + if (mread(sp + STACK_INT_FRAME_REGS, ®s, sizeof(regs)) != sizeof(regs)) { + printf("Couldn't read registers at %lx\n", + sp + STACK_INT_FRAME_REGS); + break; + } + printf("--- Exception: %lx %s at ", regs.trap, + getvecname(TRAP(®s))); + pc = regs.nip; + lr = regs.link; + xmon_print_symbol(pc, " ", "\n"); + } + + if (newsp == 0) + break; + + sp = newsp; + } +} + +static void backtrace(struct pt_regs *excp) +{ + unsigned long sp; + + if (scanhex(&sp)) + xmon_show_stack(sp, 0, 0); + else + xmon_show_stack(excp->gpr[1], excp->link, excp->nip); + scannl(); +} + +static void print_bug_trap(struct pt_regs *regs) +{ +#ifdef CONFIG_BUG + const struct bug_entry *bug; + unsigned long addr; + + if (regs->msr & MSR_PR) + return; /* not in kernel */ + addr = regs->nip; /* address of trap instruction */ + if (!is_kernel_addr(addr)) + return; + bug = find_bug(regs->nip); + if (bug == NULL) + return; + if (is_warning_bug(bug)) + return; + +#ifdef CONFIG_DEBUG_BUGVERBOSE + printf("kernel BUG at %s:%u!\n", + (char *)bug + bug->file_disp, bug->line); +#else + printf("kernel BUG at %px!\n", (void *)bug + bug->bug_addr_disp); +#endif +#endif /* CONFIG_BUG */ +} + +static void excprint(struct pt_regs *fp) +{ + unsigned long trap; + +#ifdef CONFIG_SMP + printf("cpu 0x%x: ", smp_processor_id()); +#endif /* CONFIG_SMP */ + + trap = TRAP(fp); + printf("Vector: %lx %s at [%px]\n", fp->trap, getvecname(trap), fp); + printf(" pc: "); + xmon_print_symbol(fp->nip, ": ", "\n"); + + printf(" lr: "); + xmon_print_symbol(fp->link, ": ", "\n"); + + printf(" sp: %lx\n", fp->gpr[1]); + printf(" msr: %lx\n", fp->msr); + + if (trap == INTERRUPT_DATA_STORAGE || + trap == INTERRUPT_DATA_SEGMENT || + trap == INTERRUPT_ALIGNMENT || + trap == INTERRUPT_MACHINE_CHECK) { + printf(" dar: %lx\n", fp->dar); + if (trap != INTERRUPT_DATA_SEGMENT) + printf(" dsisr: %lx\n", fp->dsisr); + } + + printf(" current = 0x%px\n", current); +#ifdef CONFIG_PPC64 + printf(" paca = 0x%px\t irqmask: 0x%02x\t irq_happened: 0x%02x\n", + local_paca, local_paca->irq_soft_mask, local_paca->irq_happened); +#endif + if (current) { + printf(" pid = %d, comm = %s\n", + current->pid, current->comm); + } + + if (trap == INTERRUPT_PROGRAM) + print_bug_trap(fp); + + printf(linux_banner); +} + +static void prregs(struct pt_regs *fp) +{ + int n, trap; + unsigned long base; + struct pt_regs regs; + + if (scanhex(&base)) { + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + regs = *(struct pt_regs *)base; + sync(); + __delay(200); + } else { + catch_memory_errors = 0; + printf("*** Error reading registers from "REG"\n", + base); + return; + } + catch_memory_errors = 0; + fp = ®s; + } + +#ifdef CONFIG_PPC64 +#define R_PER_LINE 2 +#else +#define R_PER_LINE 4 +#endif + + for (n = 0; n < 32; ++n) { + printf("R%.2d = "REG"%s", n, fp->gpr[n], + (n % R_PER_LINE) == R_PER_LINE - 1 ? "\n" : " "); + } + + printf("pc = "); + xmon_print_symbol(fp->nip, " ", "\n"); + if (!trap_is_syscall(fp) && cpu_has_feature(CPU_FTR_CFAR)) { + printf("cfar= "); + xmon_print_symbol(fp->orig_gpr3, " ", "\n"); + } + printf("lr = "); + xmon_print_symbol(fp->link, " ", "\n"); + printf("msr = "REG" cr = %.8lx\n", fp->msr, fp->ccr); + printf("ctr = "REG" xer = "REG" trap = %4lx\n", + fp->ctr, fp->xer, fp->trap); + trap = TRAP(fp); + if (trap == INTERRUPT_DATA_STORAGE || + trap == INTERRUPT_DATA_SEGMENT || + trap == INTERRUPT_ALIGNMENT) + printf("dar = "REG" dsisr = %.8lx\n", fp->dar, fp->dsisr); +} + +static void cacheflush(void) +{ + int cmd; + unsigned long nflush; + + cmd = inchar(); + if (cmd != 'i') + termch = cmd; + scanhex((void *)&adrs); + if (termch != '\n') + termch = 0; + nflush = 1; + scanhex(&nflush); + nflush = (nflush + L1_CACHE_BYTES - 1) / L1_CACHE_BYTES; + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + + if (cmd != 'i' || IS_ENABLED(CONFIG_PPC_BOOK3S_64)) { + for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) + cflush((void *) adrs); + } else { + for (; nflush > 0; --nflush, adrs += L1_CACHE_BYTES) + cinval((void *) adrs); + } + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + } + catch_memory_errors = 0; +} + +extern unsigned long xmon_mfspr(int spr, unsigned long default_value); +extern void xmon_mtspr(int spr, unsigned long value); + +static int +read_spr(int n, unsigned long *vp) +{ + unsigned long ret = -1UL; + int ok = 0; + + if (setjmp(bus_error_jmp) == 0) { + catch_spr_faults = 1; + sync(); + + ret = xmon_mfspr(n, *vp); + + sync(); + *vp = ret; + ok = 1; + } + catch_spr_faults = 0; + + return ok; +} + +static void +write_spr(int n, unsigned long val) +{ + if (xmon_is_ro) { + printf(xmon_ro_msg); + return; + } + + if (setjmp(bus_error_jmp) == 0) { + catch_spr_faults = 1; + sync(); + + xmon_mtspr(n, val); + + sync(); + } else { + printf("SPR 0x%03x (%4d) Faulted during write\n", n, n); + } + catch_spr_faults = 0; +} + +static void dump_206_sprs(void) +{ +#ifdef CONFIG_PPC64 + if (!cpu_has_feature(CPU_FTR_ARCH_206)) + return; + + /* Actually some of these pre-date 2.06, but whatever */ + + printf("srr0 = %.16lx srr1 = %.16lx dsisr = %.8lx\n", + mfspr(SPRN_SRR0), mfspr(SPRN_SRR1), mfspr(SPRN_DSISR)); + printf("dscr = %.16lx ppr = %.16lx pir = %.8lx\n", + mfspr(SPRN_DSCR), mfspr(SPRN_PPR), mfspr(SPRN_PIR)); + printf("amr = %.16lx uamor = %.16lx\n", + mfspr(SPRN_AMR), mfspr(SPRN_UAMOR)); + + if (!(mfmsr() & MSR_HV)) + return; + + printf("sdr1 = %.16lx hdar = %.16lx hdsisr = %.8lx\n", + mfspr(SPRN_SDR1), mfspr(SPRN_HDAR), mfspr(SPRN_HDSISR)); + printf("hsrr0 = %.16lx hsrr1 = %.16lx hdec = %.16lx\n", + mfspr(SPRN_HSRR0), mfspr(SPRN_HSRR1), mfspr(SPRN_HDEC)); + printf("lpcr = %.16lx pcr = %.16lx lpidr = %.8lx\n", + mfspr(SPRN_LPCR), mfspr(SPRN_PCR), mfspr(SPRN_LPID)); + printf("hsprg0 = %.16lx hsprg1 = %.16lx amor = %.16lx\n", + mfspr(SPRN_HSPRG0), mfspr(SPRN_HSPRG1), mfspr(SPRN_AMOR)); + printf("dabr = %.16lx dabrx = %.16lx\n", + mfspr(SPRN_DABR), mfspr(SPRN_DABRX)); +#endif +} + +static void dump_207_sprs(void) +{ +#ifdef CONFIG_PPC64 + unsigned long msr; + + if (!cpu_has_feature(CPU_FTR_ARCH_207S)) + return; + + printf("dpdes = %.16lx tir = %.16lx cir = %.8lx\n", + mfspr(SPRN_DPDES), mfspr(SPRN_TIR), mfspr(SPRN_CIR)); + + printf("fscr = %.16lx tar = %.16lx pspb = %.8lx\n", + mfspr(SPRN_FSCR), mfspr(SPRN_TAR), mfspr(SPRN_PSPB)); + + msr = mfmsr(); + if (msr & MSR_TM) { + /* Only if TM has been enabled in the kernel */ + printf("tfhar = %.16lx tfiar = %.16lx texasr = %.16lx\n", + mfspr(SPRN_TFHAR), mfspr(SPRN_TFIAR), + mfspr(SPRN_TEXASR)); + } + + printf("mmcr0 = %.16lx mmcr1 = %.16lx mmcr2 = %.16lx\n", + mfspr(SPRN_MMCR0), mfspr(SPRN_MMCR1), mfspr(SPRN_MMCR2)); + printf("pmc1 = %.8lx pmc2 = %.8lx pmc3 = %.8lx pmc4 = %.8lx\n", + mfspr(SPRN_PMC1), mfspr(SPRN_PMC2), + mfspr(SPRN_PMC3), mfspr(SPRN_PMC4)); + printf("mmcra = %.16lx siar = %.16lx pmc5 = %.8lx\n", + mfspr(SPRN_MMCRA), mfspr(SPRN_SIAR), mfspr(SPRN_PMC5)); + printf("sdar = %.16lx sier = %.16lx pmc6 = %.8lx\n", + mfspr(SPRN_SDAR), mfspr(SPRN_SIER), mfspr(SPRN_PMC6)); + printf("ebbhr = %.16lx ebbrr = %.16lx bescr = %.16lx\n", + mfspr(SPRN_EBBHR), mfspr(SPRN_EBBRR), mfspr(SPRN_BESCR)); + printf("iamr = %.16lx\n", mfspr(SPRN_IAMR)); + + if (!(msr & MSR_HV)) + return; + + printf("hfscr = %.16lx dhdes = %.16lx rpr = %.16lx\n", + mfspr(SPRN_HFSCR), mfspr(SPRN_DHDES), mfspr(SPRN_RPR)); + printf("dawr0 = %.16lx dawrx0 = %.16lx\n", + mfspr(SPRN_DAWR0), mfspr(SPRN_DAWRX0)); + if (nr_wp_slots() > 1) { + printf("dawr1 = %.16lx dawrx1 = %.16lx\n", + mfspr(SPRN_DAWR1), mfspr(SPRN_DAWRX1)); + } + printf("ciabr = %.16lx\n", mfspr(SPRN_CIABR)); +#endif +} + +static void dump_300_sprs(void) +{ +#ifdef CONFIG_PPC64 + bool hv = mfmsr() & MSR_HV; + + if (!cpu_has_feature(CPU_FTR_ARCH_300)) + return; + + if (cpu_has_feature(CPU_FTR_P9_TIDR)) { + printf("pidr = %.16lx tidr = %.16lx\n", + mfspr(SPRN_PID), mfspr(SPRN_TIDR)); + } else { + printf("pidr = %.16lx\n", + mfspr(SPRN_PID)); + } + + printf("psscr = %.16lx\n", + hv ? mfspr(SPRN_PSSCR) : mfspr(SPRN_PSSCR_PR)); + + if (!hv) + return; + + printf("ptcr = %.16lx asdr = %.16lx\n", + mfspr(SPRN_PTCR), mfspr(SPRN_ASDR)); +#endif +} + +static void dump_310_sprs(void) +{ +#ifdef CONFIG_PPC64 + if (!cpu_has_feature(CPU_FTR_ARCH_31)) + return; + + printf("mmcr3 = %.16lx, sier2 = %.16lx, sier3 = %.16lx\n", + mfspr(SPRN_MMCR3), mfspr(SPRN_SIER2), mfspr(SPRN_SIER3)); + +#endif +} + +static void dump_one_spr(int spr, bool show_unimplemented) +{ + unsigned long val; + + val = 0xdeadbeef; + if (!read_spr(spr, &val)) { + printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr); + return; + } + + if (val == 0xdeadbeef) { + /* Looks like read was a nop, confirm */ + val = 0x0badcafe; + if (!read_spr(spr, &val)) { + printf("SPR 0x%03x (%4d) Faulted during read\n", spr, spr); + return; + } + + if (val == 0x0badcafe) { + if (show_unimplemented) + printf("SPR 0x%03x (%4d) Unimplemented\n", spr, spr); + return; + } + } + + printf("SPR 0x%03x (%4d) = 0x%lx\n", spr, spr, val); +} + +static void super_regs(void) +{ + static unsigned long regno; + int cmd; + int spr; + + cmd = skipbl(); + + switch (cmd) { + case '\n': { + unsigned long sp, toc; + asm("mr %0,1" : "=r" (sp) :); + asm("mr %0,2" : "=r" (toc) :); + + printf("msr = "REG" sprg0 = "REG"\n", + mfmsr(), mfspr(SPRN_SPRG0)); + printf("pvr = "REG" sprg1 = "REG"\n", + mfspr(SPRN_PVR), mfspr(SPRN_SPRG1)); + printf("dec = "REG" sprg2 = "REG"\n", + mfspr(SPRN_DEC), mfspr(SPRN_SPRG2)); + printf("sp = "REG" sprg3 = "REG"\n", sp, mfspr(SPRN_SPRG3)); + printf("toc = "REG" dar = "REG"\n", toc, mfspr(SPRN_DAR)); + + dump_206_sprs(); + dump_207_sprs(); + dump_300_sprs(); + dump_310_sprs(); + + return; + } + case 'w': { + unsigned long val; + scanhex(®no); + val = 0; + read_spr(regno, &val); + scanhex(&val); + write_spr(regno, val); + dump_one_spr(regno, true); + break; + } + case 'r': + scanhex(®no); + dump_one_spr(regno, true); + break; + case 'a': + /* dump ALL SPRs */ + for (spr = 1; spr < 1024; ++spr) + dump_one_spr(spr, false); + break; + } + + scannl(); +} + +/* + * Stuff for reading and writing memory safely + */ +static int +mread(unsigned long adrs, void *buf, int size) +{ + volatile int n; + char *p, *q; + + n = 0; + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + p = (char *)adrs; + q = (char *)buf; + switch (size) { + case 2: + *(u16 *)q = *(u16 *)p; + break; + case 4: + *(u32 *)q = *(u32 *)p; + break; + case 8: + *(u64 *)q = *(u64 *)p; + break; + default: + for( ; n < size; ++n) { + *q++ = *p++; + sync(); + } + } + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + n = size; + } + catch_memory_errors = 0; + return n; +} + +static int +mwrite(unsigned long adrs, void *buf, int size) +{ + volatile int n; + char *p, *q; + + n = 0; + + if (xmon_is_ro) { + printf(xmon_ro_msg); + return n; + } + + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + p = (char *) adrs; + q = (char *) buf; + switch (size) { + case 2: + *(u16 *)p = *(u16 *)q; + break; + case 4: + *(u32 *)p = *(u32 *)q; + break; + case 8: + *(u64 *)p = *(u64 *)q; + break; + default: + for ( ; n < size; ++n) { + *p++ = *q++; + sync(); + } + } + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + n = size; + } else { + printf("*** Error writing address "REG"\n", adrs + n); + } + catch_memory_errors = 0; + return n; +} + +static int +mread_instr(unsigned long adrs, ppc_inst_t *instr) +{ + volatile int n; + + n = 0; + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + *instr = ppc_inst_read((u32 *)adrs); + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + n = ppc_inst_len(*instr); + } + catch_memory_errors = 0; + return n; +} + +static int fault_type; +static int fault_except; +static char *fault_chars[] = { "--", "**", "##" }; + +static int handle_fault(struct pt_regs *regs) +{ + fault_except = TRAP(regs); + switch (TRAP(regs)) { + case 0x200: + fault_type = 0; + break; + case 0x300: + case 0x380: + fault_type = 1; + break; + default: + fault_type = 2; + } + + longjmp(bus_error_jmp, 1); + + return 0; +} + +#define SWAP(a, b, t) ((t) = (a), (a) = (b), (b) = (t)) + +static void +byterev(unsigned char *val, int size) +{ + int t; + + switch (size) { + case 2: + SWAP(val[0], val[1], t); + break; + case 4: + SWAP(val[0], val[3], t); + SWAP(val[1], val[2], t); + break; + case 8: /* is there really any use for this? */ + SWAP(val[0], val[7], t); + SWAP(val[1], val[6], t); + SWAP(val[2], val[5], t); + SWAP(val[3], val[4], t); + break; + } +} + +static int brev; +static int mnoread; + +static char *memex_help_string = + "Memory examine command usage:\n" + "m [addr] [flags] examine/change memory\n" + " addr is optional. will start where left off.\n" + " flags may include chars from this set:\n" + " b modify by bytes (default)\n" + " w modify by words (2 byte)\n" + " l modify by longs (4 byte)\n" + " d modify by doubleword (8 byte)\n" + " r toggle reverse byte order mode\n" + " n do not read memory (for i/o spaces)\n" + " . ok to read (default)\n" + "NOTE: flags are saved as defaults\n" + ""; + +static char *memex_subcmd_help_string = + "Memory examine subcommands:\n" + " hexval write this val to current location\n" + " 'string' write chars from string to this location\n" + " ' increment address\n" + " ^ decrement address\n" + " / increment addr by 0x10. //=0x100, ///=0x1000, etc\n" + " \\ decrement addr by 0x10. \\\\=0x100, \\\\\\=0x1000, etc\n" + " ` clear no-read flag\n" + " ; stay at this addr\n" + " v change to byte mode\n" + " w change to word (2 byte) mode\n" + " l change to long (4 byte) mode\n" + " u change to doubleword (8 byte) mode\n" + " m addr change current addr\n" + " n toggle no-read flag\n" + " r toggle byte reverse flag\n" + " < count back up count bytes\n" + " > count skip forward count bytes\n" + " x exit this mode\n" + ""; + +static void +memex(void) +{ + int cmd, inc, i, nslash; + unsigned long n; + unsigned char val[16]; + + scanhex((void *)&adrs); + cmd = skipbl(); + if (cmd == '?') { + printf(memex_help_string); + return; + } else { + termch = cmd; + } + last_cmd = "m\n"; + while ((cmd = skipbl()) != '\n') { + switch( cmd ){ + case 'b': size = 1; break; + case 'w': size = 2; break; + case 'l': size = 4; break; + case 'd': size = 8; break; + case 'r': brev = !brev; break; + case 'n': mnoread = 1; break; + case '.': mnoread = 0; break; + } + } + if( size <= 0 ) + size = 1; + else if( size > 8 ) + size = 8; + for(;;){ + if (!mnoread) + n = mread(adrs, val, size); + printf(REG"%c", adrs, brev? 'r': ' '); + if (!mnoread) { + if (brev) + byterev(val, size); + putchar(' '); + for (i = 0; i < n; ++i) + printf("%.2x", val[i]); + for (; i < size; ++i) + printf("%s", fault_chars[fault_type]); + } + putchar(' '); + inc = size; + nslash = 0; + for(;;){ + if( scanhex(&n) ){ + for (i = 0; i < size; ++i) + val[i] = n >> (i * 8); + if (!brev) + byterev(val, size); + mwrite(adrs, val, size); + inc = size; + } + cmd = skipbl(); + if (cmd == '\n') + break; + inc = 0; + switch (cmd) { + case '\'': + for(;;){ + n = inchar(); + if( n == '\\' ) + n = bsesc(); + else if( n == '\'' ) + break; + for (i = 0; i < size; ++i) + val[i] = n >> (i * 8); + if (!brev) + byterev(val, size); + mwrite(adrs, val, size); + adrs += size; + } + adrs -= size; + inc = size; + break; + case ',': + adrs += size; + break; + case '.': + mnoread = 0; + break; + case ';': + break; + case 'x': + case EOF: + scannl(); + return; + case 'b': + case 'v': + size = 1; + break; + case 'w': + size = 2; + break; + case 'l': + size = 4; + break; + case 'u': + size = 8; + break; + case '^': + adrs -= size; + break; + case '/': + if (nslash > 0) + adrs -= 1 << nslash; + else + nslash = 0; + nslash += 4; + adrs += 1 << nslash; + break; + case '\\': + if (nslash < 0) + adrs += 1 << -nslash; + else + nslash = 0; + nslash -= 4; + adrs -= 1 << -nslash; + break; + case 'm': + scanhex((void *)&adrs); + break; + case 'n': + mnoread = 1; + break; + case 'r': + brev = !brev; + break; + case '<': + n = size; + scanhex(&n); + adrs -= n; + break; + case '>': + n = size; + scanhex(&n); + adrs += n; + break; + case '?': + printf(memex_subcmd_help_string); + break; + } + } + adrs += inc; + } +} + +static int +bsesc(void) +{ + int c; + + c = inchar(); + switch( c ){ + case 'n': c = '\n'; break; + case 'r': c = '\r'; break; + case 'b': c = '\b'; break; + case 't': c = '\t'; break; + } + return c; +} + +static void xmon_rawdump (unsigned long adrs, long ndump) +{ + long n, m, r, nr; + unsigned char temp[16]; + + for (n = ndump; n > 0;) { + r = n < 16? n: 16; + nr = mread(adrs, temp, r); + adrs += nr; + for (m = 0; m < r; ++m) { + if (m < nr) + printf("%.2x", temp[m]); + else + printf("%s", fault_chars[fault_type]); + } + n -= r; + if (nr < r) + break; + } + printf("\n"); +} + +static void dump_tracing(void) +{ + int c; + + c = inchar(); + if (c == 'c') + ftrace_dump(DUMP_ORIG); + else + ftrace_dump(DUMP_ALL); +} + +#ifdef CONFIG_PPC64 +static void dump_one_paca(int cpu) +{ + struct paca_struct *p; +#ifdef CONFIG_PPC_64S_HASH_MMU + int i = 0; +#endif + + if (setjmp(bus_error_jmp) != 0) { + printf("*** Error dumping paca for cpu 0x%x!\n", cpu); + return; + } + + catch_memory_errors = 1; + sync(); + + p = paca_ptrs[cpu]; + + printf("paca for cpu 0x%x @ %px:\n", cpu, p); + + printf(" %-*s = %s\n", 25, "possible", cpu_possible(cpu) ? "yes" : "no"); + printf(" %-*s = %s\n", 25, "present", cpu_present(cpu) ? "yes" : "no"); + printf(" %-*s = %s\n", 25, "online", cpu_online(cpu) ? "yes" : "no"); + +#define DUMP(paca, name, format) \ + printf(" %-*s = "format"\t(0x%lx)\n", 25, #name, 18, paca->name, \ + offsetof(struct paca_struct, name)); + + DUMP(p, lock_token, "%#-*x"); + DUMP(p, paca_index, "%#-*x"); +#ifndef CONFIG_PPC_KERNEL_PCREL + DUMP(p, kernel_toc, "%#-*llx"); +#endif + DUMP(p, kernelbase, "%#-*llx"); + DUMP(p, kernel_msr, "%#-*llx"); + DUMP(p, emergency_sp, "%-*px"); +#ifdef CONFIG_PPC_BOOK3S_64 + DUMP(p, nmi_emergency_sp, "%-*px"); + DUMP(p, mc_emergency_sp, "%-*px"); + DUMP(p, in_nmi, "%#-*x"); + DUMP(p, in_mce, "%#-*x"); + DUMP(p, hmi_event_available, "%#-*x"); +#endif + DUMP(p, data_offset, "%#-*llx"); + DUMP(p, hw_cpu_id, "%#-*x"); + DUMP(p, cpu_start, "%#-*x"); + DUMP(p, kexec_state, "%#-*x"); +#ifdef CONFIG_PPC_BOOK3S_64 +#ifdef CONFIG_PPC_64S_HASH_MMU + if (!early_radix_enabled()) { + for (i = 0; i < SLB_NUM_BOLTED; i++) { + u64 esid, vsid; + + if (!p->slb_shadow_ptr) + continue; + + esid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].esid); + vsid = be64_to_cpu(p->slb_shadow_ptr->save_area[i].vsid); + + if (esid || vsid) { + printf(" %-*s[%d] = 0x%016llx 0x%016llx\n", + 22, "slb_shadow", i, esid, vsid); + } + } + DUMP(p, vmalloc_sllp, "%#-*x"); + DUMP(p, stab_rr, "%#-*x"); + DUMP(p, slb_used_bitmap, "%#-*x"); + DUMP(p, slb_kern_bitmap, "%#-*x"); + + if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { + DUMP(p, slb_cache_ptr, "%#-*x"); + for (i = 0; i < SLB_CACHE_ENTRIES; i++) + printf(" %-*s[%d] = 0x%016x\n", + 22, "slb_cache", i, p->slb_cache[i]); + } + } +#endif + + DUMP(p, rfi_flush_fallback_area, "%-*px"); +#endif + DUMP(p, dscr_default, "%#-*llx"); +#ifdef CONFIG_PPC_BOOK3E_64 + DUMP(p, pgd, "%-*px"); + DUMP(p, kernel_pgd, "%-*px"); + DUMP(p, tcd_ptr, "%-*px"); + DUMP(p, mc_kstack, "%-*px"); + DUMP(p, crit_kstack, "%-*px"); + DUMP(p, dbg_kstack, "%-*px"); +#endif + DUMP(p, __current, "%-*px"); + DUMP(p, kstack, "%#-*llx"); + printf(" %-*s = 0x%016llx\n", 25, "kstack_base", p->kstack & ~(THREAD_SIZE - 1)); +#ifdef CONFIG_STACKPROTECTOR + DUMP(p, canary, "%#-*lx"); +#endif + DUMP(p, saved_r1, "%#-*llx"); +#ifdef CONFIG_PPC_BOOK3E_64 + DUMP(p, trap_save, "%#-*x"); +#endif + DUMP(p, irq_soft_mask, "%#-*x"); + DUMP(p, irq_happened, "%#-*x"); +#ifdef CONFIG_MMIOWB + DUMP(p, mmiowb_state.nesting_count, "%#-*x"); + DUMP(p, mmiowb_state.mmiowb_pending, "%#-*x"); +#endif + DUMP(p, irq_work_pending, "%#-*x"); + DUMP(p, sprg_vdso, "%#-*llx"); + +#ifdef CONFIG_PPC_TRANSACTIONAL_MEM + DUMP(p, tm_scratch, "%#-*llx"); +#endif + +#ifdef CONFIG_PPC_POWERNV + DUMP(p, idle_state, "%#-*lx"); + if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { + DUMP(p, thread_idle_state, "%#-*x"); + DUMP(p, subcore_sibling_mask, "%#-*x"); + } else { +#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE + DUMP(p, requested_psscr, "%#-*llx"); + DUMP(p, dont_stop.counter, "%#-*x"); +#endif + } +#endif + + DUMP(p, accounting.utime, "%#-*lx"); + DUMP(p, accounting.stime, "%#-*lx"); +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + DUMP(p, accounting.utime_scaled, "%#-*lx"); +#endif + DUMP(p, accounting.starttime, "%#-*lx"); + DUMP(p, accounting.starttime_user, "%#-*lx"); +#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME + DUMP(p, accounting.startspurr, "%#-*lx"); + DUMP(p, accounting.utime_sspurr, "%#-*lx"); +#endif + DUMP(p, accounting.steal_time, "%#-*lx"); +#undef DUMP + + catch_memory_errors = 0; + sync(); +} + +static void dump_all_pacas(void) +{ + int cpu; + + if (num_possible_cpus() == 0) { + printf("No possible cpus, use 'dp #' to dump individual cpus\n"); + return; + } + + for_each_possible_cpu(cpu) + dump_one_paca(cpu); +} + +static void dump_pacas(void) +{ + unsigned long num; + int c; + + c = inchar(); + if (c == 'a') { + dump_all_pacas(); + return; + } + + termch = c; /* Put c back, it wasn't 'a' */ + + if (scanhex(&num)) + dump_one_paca(num); + else + dump_one_paca(xmon_owner); +} +#endif + +#ifdef CONFIG_PPC_POWERNV +static void dump_one_xive(int cpu) +{ + unsigned int hwid = get_hard_smp_processor_id(cpu); + bool hv = cpu_has_feature(CPU_FTR_HVMODE); + + if (hv) { + opal_xive_dump(XIVE_DUMP_TM_HYP, hwid); + opal_xive_dump(XIVE_DUMP_TM_POOL, hwid); + opal_xive_dump(XIVE_DUMP_TM_OS, hwid); + opal_xive_dump(XIVE_DUMP_TM_USER, hwid); + opal_xive_dump(XIVE_DUMP_VP, hwid); + opal_xive_dump(XIVE_DUMP_EMU_STATE, hwid); + } + + if (setjmp(bus_error_jmp) != 0) { + catch_memory_errors = 0; + printf("*** Error dumping xive on cpu %d\n", cpu); + return; + } + + catch_memory_errors = 1; + sync(); + xmon_xive_do_dump(cpu); + sync(); + __delay(200); + catch_memory_errors = 0; +} + +static void dump_all_xives(void) +{ + int cpu; + + if (num_online_cpus() == 0) { + printf("No possible cpus, use 'dx #' to dump individual cpus\n"); + return; + } + + for_each_online_cpu(cpu) + dump_one_xive(cpu); +} + +static void dump_xives(void) +{ + unsigned long num; + int c; + + if (!xive_enabled()) { + printf("Xive disabled on this system\n"); + return; + } + + c = inchar(); + if (c == 'a') { + dump_all_xives(); + return; + } else if (c == 'i') { + if (scanhex(&num)) + xmon_xive_get_irq_config(num, NULL); + else + xmon_xive_get_irq_all(); + return; + } + + termch = c; /* Put c back, it wasn't 'a' */ + + if (scanhex(&num)) + dump_one_xive(num); + else + dump_one_xive(xmon_owner); +} +#endif /* CONFIG_PPC_POWERNV */ + +static void dump_by_size(unsigned long addr, long count, int size) +{ + unsigned char temp[16]; + int i, j; + u64 val; + + count = ALIGN(count, 16); + + for (i = 0; i < count; i += 16, addr += 16) { + printf(REG, addr); + + if (mread(addr, temp, 16) != 16) { + printf("\nFaulted reading %d bytes from 0x"REG"\n", 16, addr); + return; + } + + for (j = 0; j < 16; j += size) { + putchar(' '); + switch (size) { + case 1: val = temp[j]; break; + case 2: val = *(u16 *)&temp[j]; break; + case 4: val = *(u32 *)&temp[j]; break; + case 8: val = *(u64 *)&temp[j]; break; + default: val = 0; + } + + printf("%0*llx", size * 2, val); + } + printf(" |"); + for (j = 0; j < 16; ++j) { + val = temp[j]; + putchar(' ' <= val && val <= '~' ? val : '.'); + } + printf("|\n"); + } +} + +static void +dump(void) +{ + static char last[] = { "d?\n" }; + int c; + + c = inchar(); + +#ifdef CONFIG_PPC64 + if (c == 'p') { + xmon_start_pagination(); + dump_pacas(); + xmon_end_pagination(); + return; + } +#endif +#ifdef CONFIG_PPC_POWERNV + if (c == 'x') { + xmon_start_pagination(); + dump_xives(); + xmon_end_pagination(); + return; + } +#endif + + if (c == 't') { + dump_tracing(); + return; + } + + if (c == '\n') + termch = c; + + scanhex((void *)&adrs); + if (termch != '\n') + termch = 0; + if (c == 'i') { + scanhex(&nidump); + if (nidump == 0) + nidump = 16; + else if (nidump > MAX_IDUMP) + nidump = MAX_IDUMP; + adrs += ppc_inst_dump(adrs, nidump, 1); + last_cmd = "di\n"; + } else if (c == 'l') { + dump_log_buf(); + } else if (c == 'o') { + dump_opal_msglog(); + } else if (c == 'v') { + /* dump virtual to physical translation */ + show_pte(adrs); + } else if (c == 'r') { + scanhex(&ndump); + if (ndump == 0) + ndump = 64; + xmon_rawdump(adrs, ndump); + adrs += ndump; + last_cmd = "dr\n"; + } else { + scanhex(&ndump); + if (ndump == 0) + ndump = 64; + else if (ndump > MAX_DUMP) + ndump = MAX_DUMP; + + switch (c) { + case '8': + case '4': + case '2': + case '1': + ndump = ALIGN(ndump, 16); + dump_by_size(adrs, ndump, c - '0'); + last[1] = c; + last_cmd = last; + break; + default: + prdump(adrs, ndump); + last_cmd = "d\n"; + } + + adrs += ndump; + } +} + +static void +prdump(unsigned long adrs, long ndump) +{ + long n, m, c, r, nr; + unsigned char temp[16]; + + for (n = ndump; n > 0;) { + printf(REG, adrs); + putchar(' '); + r = n < 16? n: 16; + nr = mread(adrs, temp, r); + adrs += nr; + for (m = 0; m < r; ++m) { + if ((m & (sizeof(long) - 1)) == 0 && m > 0) + putchar(' '); + if (m < nr) + printf("%.2x", temp[m]); + else + printf("%s", fault_chars[fault_type]); + } + for (; m < 16; ++m) { + if ((m & (sizeof(long) - 1)) == 0) + putchar(' '); + printf(" "); + } + printf(" |"); + for (m = 0; m < r; ++m) { + if (m < nr) { + c = temp[m]; + putchar(' ' <= c && c <= '~'? c: '.'); + } else + putchar(' '); + } + n -= r; + for (; m < 16; ++m) + putchar(' '); + printf("|\n"); + if (nr < r) + break; + } +} + +typedef int (*instruction_dump_func)(unsigned long inst, unsigned long addr); + +static int +generic_inst_dump(unsigned long adr, long count, int praddr, + instruction_dump_func dump_func) +{ + int nr, dotted; + unsigned long first_adr; + ppc_inst_t inst, last_inst = ppc_inst(0); + + dotted = 0; + for (first_adr = adr; count > 0; --count, adr += ppc_inst_len(inst)) { + nr = mread_instr(adr, &inst); + if (nr == 0) { + if (praddr) { + const char *x = fault_chars[fault_type]; + printf(REG" %s%s%s%s\n", adr, x, x, x, x); + } + break; + } + if (adr > first_adr && ppc_inst_equal(inst, last_inst)) { + if (!dotted) { + printf(" ...\n"); + dotted = 1; + } + continue; + } + dotted = 0; + last_inst = inst; + if (praddr) + printf(REG" %08lx", adr, ppc_inst_as_ulong(inst)); + printf("\t"); + if (!ppc_inst_prefixed(inst)) + dump_func(ppc_inst_val(inst), adr); + else + dump_func(ppc_inst_as_ulong(inst), adr); + printf("\n"); + } + return adr - first_adr; +} + +static int +ppc_inst_dump(unsigned long adr, long count, int praddr) +{ + return generic_inst_dump(adr, count, praddr, print_insn_powerpc); +} + +void +print_address(unsigned long addr) +{ + xmon_print_symbol(addr, "\t# ", ""); +} + +static void +dump_log_buf(void) +{ + struct kmsg_dump_iter iter; + static unsigned char buf[1024]; + size_t len; + + if (setjmp(bus_error_jmp) != 0) { + printf("Error dumping printk buffer!\n"); + return; + } + + catch_memory_errors = 1; + sync(); + + kmsg_dump_rewind(&iter); + xmon_start_pagination(); + while (kmsg_dump_get_line(&iter, false, buf, sizeof(buf), &len)) { + buf[len] = '\0'; + printf("%s", buf); + } + xmon_end_pagination(); + + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + catch_memory_errors = 0; +} + +#ifdef CONFIG_PPC_POWERNV +static void dump_opal_msglog(void) +{ + unsigned char buf[128]; + ssize_t res; + volatile loff_t pos = 0; + + if (!firmware_has_feature(FW_FEATURE_OPAL)) { + printf("Machine is not running OPAL firmware.\n"); + return; + } + + if (setjmp(bus_error_jmp) != 0) { + printf("Error dumping OPAL msglog!\n"); + return; + } + + catch_memory_errors = 1; + sync(); + + xmon_start_pagination(); + while ((res = opal_msglog_copy(buf, pos, sizeof(buf) - 1))) { + if (res < 0) { + printf("Error dumping OPAL msglog! Error: %zd\n", res); + break; + } + buf[res] = '\0'; + printf("%s", buf); + pos += res; + } + xmon_end_pagination(); + + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + catch_memory_errors = 0; +} +#endif + +/* + * Memory operations - move, set, print differences + */ +static unsigned long mdest; /* destination address */ +static unsigned long msrc; /* source address */ +static unsigned long mval; /* byte value to set memory to */ +static unsigned long mcount; /* # bytes to affect */ +static unsigned long mdiffs; /* max # differences to print */ + +static void +memops(int cmd) +{ + scanhex((void *)&mdest); + if( termch != '\n' ) + termch = 0; + scanhex((void *)(cmd == 's'? &mval: &msrc)); + if( termch != '\n' ) + termch = 0; + scanhex((void *)&mcount); + switch( cmd ){ + case 'm': + if (xmon_is_ro) { + printf(xmon_ro_msg); + break; + } + memmove((void *)mdest, (void *)msrc, mcount); + break; + case 's': + if (xmon_is_ro) { + printf(xmon_ro_msg); + break; + } + memset((void *)mdest, mval, mcount); + break; + case 'd': + if( termch != '\n' ) + termch = 0; + scanhex((void *)&mdiffs); + memdiffs((unsigned char *)mdest, (unsigned char *)msrc, mcount, mdiffs); + break; + } +} + +static void +memdiffs(unsigned char *p1, unsigned char *p2, unsigned nb, unsigned maxpr) +{ + unsigned n, prt; + + prt = 0; + for( n = nb; n > 0; --n ) + if( *p1++ != *p2++ ) + if( ++prt <= maxpr ) + printf("%px %.2x # %px %.2x\n", p1 - 1, + p1[-1], p2 - 1, p2[-1]); + if( prt > maxpr ) + printf("Total of %d differences\n", prt); +} + +static unsigned mend; +static unsigned mask; + +static void +memlocate(void) +{ + unsigned a, n; + unsigned char val[4]; + + last_cmd = "ml"; + scanhex((void *)&mdest); + if (termch != '\n') { + termch = 0; + scanhex((void *)&mend); + if (termch != '\n') { + termch = 0; + scanhex((void *)&mval); + mask = ~0; + if (termch != '\n') termch = 0; + scanhex((void *)&mask); + } + } + n = 0; + for (a = mdest; a < mend; a += 4) { + if (mread(a, val, 4) == 4 + && ((GETWORD(val) ^ mval) & mask) == 0) { + printf("%.16x: %.16x\n", a, GETWORD(val)); + if (++n >= 10) + break; + } + } +} + +static unsigned long mskip = 0x1000; +static unsigned long mlim = 0xffffffff; + +static void +memzcan(void) +{ + unsigned char v; + unsigned a; + int ok, ook; + + scanhex(&mdest); + if (termch != '\n') termch = 0; + scanhex(&mskip); + if (termch != '\n') termch = 0; + scanhex(&mlim); + ook = 0; + for (a = mdest; a < mlim; a += mskip) { + ok = mread(a, &v, 1); + if (ok && !ook) { + printf("%.8x .. ", a); + } else if (!ok && ook) + printf("%.8lx\n", a - mskip); + ook = ok; + if (a + mskip < a) + break; + } + if (ook) + printf("%.8lx\n", a - mskip); +} + +static void show_task(struct task_struct *volatile tsk) +{ + unsigned int p_state = READ_ONCE(tsk->__state); + char state; + + /* + * Cloned from kdb_task_state_char(), which is not entirely + * appropriate for calling from xmon. This could be moved + * to a common, generic, routine used by both. + */ + state = (p_state == TASK_RUNNING) ? 'R' : + (p_state & TASK_UNINTERRUPTIBLE) ? 'D' : + (p_state & TASK_STOPPED) ? 'T' : + (p_state & TASK_TRACED) ? 'C' : + (tsk->exit_state & EXIT_ZOMBIE) ? 'Z' : + (tsk->exit_state & EXIT_DEAD) ? 'E' : + (p_state & TASK_INTERRUPTIBLE) ? 'S' : '?'; + + printf("%16px %16lx %16px %6d %6d %c %2d %s\n", tsk, + tsk->thread.ksp, tsk->thread.regs, + tsk->pid, rcu_dereference(tsk->parent)->pid, + state, task_cpu(tsk), + tsk->comm); +} + +#ifdef CONFIG_PPC_BOOK3S_64 +static void format_pte(void *ptep, unsigned long pte) +{ + pte_t entry = __pte(pte); + + printf("ptep @ 0x%016lx = 0x%016lx\n", (unsigned long)ptep, pte); + printf("Maps physical address = 0x%016lx\n", pte & PTE_RPN_MASK); + + printf("Flags = %s%s%s%s%s\n", + pte_young(entry) ? "Accessed " : "", + pte_dirty(entry) ? "Dirty " : "", + pte_read(entry) ? "Read " : "", + pte_write(entry) ? "Write " : "", + pte_exec(entry) ? "Exec " : ""); +} + +static void show_pte(unsigned long addr) +{ + unsigned long tskv = 0; + struct task_struct *volatile tsk = NULL; + struct mm_struct *volatile mm; + pgd_t *pgdp; + p4d_t *p4dp; + pud_t *pudp; + pmd_t *pmdp; + pte_t *ptep; + + if (!scanhex(&tskv)) + mm = &init_mm; + else + tsk = (struct task_struct *)tskv; + + if (tsk == NULL) + mm = &init_mm; + else + mm = tsk->active_mm; + + if (setjmp(bus_error_jmp) != 0) { + catch_memory_errors = 0; + printf("*** Error dumping pte for task %px\n", tsk); + return; + } + + catch_memory_errors = 1; + sync(); + + if (mm == &init_mm) + pgdp = pgd_offset_k(addr); + else + pgdp = pgd_offset(mm, addr); + + p4dp = p4d_offset(pgdp, addr); + + if (p4d_none(*p4dp)) { + printf("No valid P4D\n"); + return; + } + + if (p4d_is_leaf(*p4dp)) { + format_pte(p4dp, p4d_val(*p4dp)); + return; + } + + printf("p4dp @ 0x%px = 0x%016lx\n", p4dp, p4d_val(*p4dp)); + + pudp = pud_offset(p4dp, addr); + + if (pud_none(*pudp)) { + printf("No valid PUD\n"); + return; + } + + if (pud_is_leaf(*pudp)) { + format_pte(pudp, pud_val(*pudp)); + return; + } + + printf("pudp @ 0x%px = 0x%016lx\n", pudp, pud_val(*pudp)); + + pmdp = pmd_offset(pudp, addr); + + if (pmd_none(*pmdp)) { + printf("No valid PMD\n"); + return; + } + + if (pmd_is_leaf(*pmdp)) { + format_pte(pmdp, pmd_val(*pmdp)); + return; + } + printf("pmdp @ 0x%px = 0x%016lx\n", pmdp, pmd_val(*pmdp)); + + ptep = pte_offset_map(pmdp, addr); + if (!ptep || pte_none(*ptep)) { + if (ptep) + pte_unmap(ptep); + printf("no valid PTE\n"); + return; + } + + format_pte(ptep, pte_val(*ptep)); + pte_unmap(ptep); + + sync(); + __delay(200); + catch_memory_errors = 0; +} +#else +static void show_pte(unsigned long addr) +{ + printf("show_pte not yet implemented\n"); +} +#endif /* CONFIG_PPC_BOOK3S_64 */ + +static void show_tasks(void) +{ + unsigned long tskv; + struct task_struct *volatile tsk = NULL; + + printf(" task_struct ->thread.ksp ->thread.regs PID PPID S P CMD\n"); + + if (scanhex(&tskv)) + tsk = (struct task_struct *)tskv; + + if (setjmp(bus_error_jmp) != 0) { + catch_memory_errors = 0; + printf("*** Error dumping task %px\n", tsk); + return; + } + + catch_memory_errors = 1; + sync(); + + if (tsk) + show_task(tsk); + else + for_each_process(tsk) + show_task(tsk); + + sync(); + __delay(200); + catch_memory_errors = 0; +} + +static void proccall(void) +{ + unsigned long args[8]; + unsigned long ret; + int i; + typedef unsigned long (*callfunc_t)(unsigned long, unsigned long, + unsigned long, unsigned long, unsigned long, + unsigned long, unsigned long, unsigned long); + callfunc_t func; + + if (!scanhex(&adrs)) + return; + if (termch != '\n') + termch = 0; + for (i = 0; i < 8; ++i) + args[i] = 0; + for (i = 0; i < 8; ++i) { + if (!scanhex(&args[i]) || termch == '\n') + break; + termch = 0; + } + func = (callfunc_t) adrs; + ret = 0; + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + ret = func(args[0], args[1], args[2], args[3], + args[4], args[5], args[6], args[7]); + sync(); + printf("return value is 0x%lx\n", ret); + } else { + printf("*** %x exception occurred\n", fault_except); + } + catch_memory_errors = 0; +} + +/* Input scanning routines */ +int +skipbl(void) +{ + int c; + + if( termch != 0 ){ + c = termch; + termch = 0; + } else + c = inchar(); + while( c == ' ' || c == '\t' ) + c = inchar(); + return c; +} + +#define N_PTREGS 44 +static const char *regnames[N_PTREGS] = { + "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", + "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", + "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", + "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", + "pc", "msr", "or3", "ctr", "lr", "xer", "ccr", +#ifdef CONFIG_PPC64 + "softe", +#else + "mq", +#endif + "trap", "dar", "dsisr", "res" +}; + +int +scanhex(unsigned long *vp) +{ + int c, d; + unsigned long v; + + c = skipbl(); + if (c == '%') { + /* parse register name */ + char regname[8]; + int i; + + for (i = 0; i < sizeof(regname) - 1; ++i) { + c = inchar(); + if (!isalnum(c)) { + termch = c; + break; + } + regname[i] = c; + } + regname[i] = 0; + i = match_string(regnames, N_PTREGS, regname); + if (i < 0) { + printf("invalid register name '%%%s'\n", regname); + return 0; + } + if (xmon_regs == NULL) { + printf("regs not available\n"); + return 0; + } + *vp = ((unsigned long *)xmon_regs)[i]; + return 1; + } + + /* skip leading "0x" if any */ + + if (c == '0') { + c = inchar(); + if (c == 'x') { + c = inchar(); + } else { + d = hexdigit(c); + if (d == EOF) { + termch = c; + *vp = 0; + return 1; + } + } + } else if (c == '$') { + int i; + for (i=0; i<63; i++) { + c = inchar(); + if (isspace(c) || c == '\0') { + termch = c; + break; + } + tmpstr[i] = c; + } + tmpstr[i++] = 0; + *vp = 0; + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + *vp = kallsyms_lookup_name(tmpstr); + sync(); + } + catch_memory_errors = 0; + if (!(*vp)) { + printf("unknown symbol '%s'\n", tmpstr); + return 0; + } + return 1; + } + + d = hexdigit(c); + if (d == EOF) { + termch = c; + return 0; + } + v = 0; + do { + v = (v << 4) + d; + c = inchar(); + d = hexdigit(c); + } while (d != EOF); + termch = c; + *vp = v; + return 1; +} + +static void +scannl(void) +{ + int c; + + c = termch; + termch = 0; + while( c != '\n' ) + c = inchar(); +} + +static int hexdigit(int c) +{ + if( '0' <= c && c <= '9' ) + return c - '0'; + if( 'A' <= c && c <= 'F' ) + return c - ('A' - 10); + if( 'a' <= c && c <= 'f' ) + return c - ('a' - 10); + return EOF; +} + +void +getstring(char *s, int size) +{ + int c; + + c = skipbl(); + if (c == '\n') { + *s = 0; + return; + } + + do { + if( size > 1 ){ + *s++ = c; + --size; + } + c = inchar(); + } while( c != ' ' && c != '\t' && c != '\n' ); + termch = c; + *s = 0; +} + +static char line[256]; +static char *lineptr; + +static void +flush_input(void) +{ + lineptr = NULL; +} + +static int +inchar(void) +{ + if (lineptr == NULL || *lineptr == 0) { + if (xmon_gets(line, sizeof(line)) == NULL) { + lineptr = NULL; + return EOF; + } + lineptr = line; + } + return *lineptr++; +} + +static void +take_input(char *str) +{ + lineptr = str; +} + + +static void +symbol_lookup(void) +{ + int type = inchar(); + unsigned long addr, cpu; + void __percpu *ptr = NULL; + static char tmp[64]; + + switch (type) { + case 'a': + if (scanhex(&addr)) + xmon_print_symbol(addr, ": ", "\n"); + termch = 0; + break; + case 's': + getstring(tmp, 64); + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + addr = kallsyms_lookup_name(tmp); + if (addr) + printf("%s: %lx\n", tmp, addr); + else + printf("Symbol '%s' not found.\n", tmp); + sync(); + } + catch_memory_errors = 0; + termch = 0; + break; + case 'p': + getstring(tmp, 64); + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + ptr = (void __percpu *)kallsyms_lookup_name(tmp); + sync(); + } + + if (ptr && + ptr >= (void __percpu *)__per_cpu_start && + ptr < (void __percpu *)__per_cpu_end) + { + if (scanhex(&cpu) && cpu < num_possible_cpus()) { + addr = (unsigned long)per_cpu_ptr(ptr, cpu); + } else { + cpu = raw_smp_processor_id(); + addr = (unsigned long)this_cpu_ptr(ptr); + } + + printf("%s for cpu 0x%lx: %lx\n", tmp, cpu, addr); + } else { + printf("Percpu symbol '%s' not found.\n", tmp); + } + + catch_memory_errors = 0; + termch = 0; + break; + } +} + + +/* Print an address in numeric and symbolic form (if possible) */ +static void xmon_print_symbol(unsigned long address, const char *mid, + const char *after) +{ + char *modname; + const char *volatile name = NULL; + unsigned long offset, size; + + printf(REG, address); + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + name = kallsyms_lookup(address, &size, &offset, &modname, + tmpstr); + sync(); + /* wait a little while to see if we get a machine check */ + __delay(200); + } + + catch_memory_errors = 0; + + if (name) { + printf("%s%s+%#lx/%#lx", mid, name, offset, size); + if (modname) + printf(" [%s]", modname); + } + printf("%s", after); +} + +#ifdef CONFIG_PPC_64S_HASH_MMU +void dump_segments(void) +{ + int i; + unsigned long esid,vsid; + unsigned long llp; + + printf("SLB contents of cpu 0x%x\n", smp_processor_id()); + + for (i = 0; i < mmu_slb_size; i++) { + asm volatile("slbmfee %0,%1" : "=r" (esid) : "r" (i)); + asm volatile("slbmfev %0,%1" : "=r" (vsid) : "r" (i)); + + if (!esid && !vsid) + continue; + + printf("%02d %016lx %016lx", i, esid, vsid); + + if (!(esid & SLB_ESID_V)) { + printf("\n"); + continue; + } + + llp = vsid & SLB_VSID_LLP; + if (vsid & SLB_VSID_B_1T) { + printf(" 1T ESID=%9lx VSID=%13lx LLP:%3lx \n", + GET_ESID_1T(esid), + (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT_1T, + llp); + } else { + printf(" 256M ESID=%9lx VSID=%13lx LLP:%3lx \n", + GET_ESID(esid), + (vsid & ~SLB_VSID_B) >> SLB_VSID_SHIFT, + llp); + } + } +} +#endif + +#ifdef CONFIG_PPC_BOOK3S_32 +void dump_segments(void) +{ + int i; + + printf("sr0-15 ="); + for (i = 0; i < 16; ++i) + printf(" %x", mfsr(i << 28)); + printf("\n"); +} +#endif + +#ifdef CONFIG_44x +static void dump_tlb_44x(void) +{ + int i; + + for (i = 0; i < PPC44x_TLB_SIZE; i++) { + unsigned long w0,w1,w2; + asm volatile("tlbre %0,%1,0" : "=r" (w0) : "r" (i)); + asm volatile("tlbre %0,%1,1" : "=r" (w1) : "r" (i)); + asm volatile("tlbre %0,%1,2" : "=r" (w2) : "r" (i)); + printf("[%02x] %08lx %08lx %08lx ", i, w0, w1, w2); + if (w0 & PPC44x_TLB_VALID) { + printf("V %08lx -> %01lx%08lx %c%c%c%c%c", + w0 & PPC44x_TLB_EPN_MASK, + w1 & PPC44x_TLB_ERPN_MASK, + w1 & PPC44x_TLB_RPN_MASK, + (w2 & PPC44x_TLB_W) ? 'W' : 'w', + (w2 & PPC44x_TLB_I) ? 'I' : 'i', + (w2 & PPC44x_TLB_M) ? 'M' : 'm', + (w2 & PPC44x_TLB_G) ? 'G' : 'g', + (w2 & PPC44x_TLB_E) ? 'E' : 'e'); + } + printf("\n"); + } +} +#endif /* CONFIG_44x */ + +#ifdef CONFIG_PPC_BOOK3E_64 +static void dump_tlb_book3e(void) +{ + u32 mmucfg; + u64 ramask; + int i, tlb, ntlbs, pidsz, lpidsz, rasz; + int mmu_version; + static const char *pgsz_names[] = { + " 1K", + " 2K", + " 4K", + " 8K", + " 16K", + " 32K", + " 64K", + "128K", + "256K", + "512K", + " 1M", + " 2M", + " 4M", + " 8M", + " 16M", + " 32M", + " 64M", + "128M", + "256M", + "512M", + " 1G", + " 2G", + " 4G", + " 8G", + " 16G", + " 32G", + " 64G", + "128G", + "256G", + "512G", + " 1T", + " 2T", + }; + + /* Gather some infos about the MMU */ + mmucfg = mfspr(SPRN_MMUCFG); + mmu_version = (mmucfg & 3) + 1; + ntlbs = ((mmucfg >> 2) & 3) + 1; + pidsz = ((mmucfg >> 6) & 0x1f) + 1; + lpidsz = (mmucfg >> 24) & 0xf; + rasz = (mmucfg >> 16) & 0x7f; + printf("Book3E MMU MAV=%d.0,%d TLBs,%d-bit PID,%d-bit LPID,%d-bit RA\n", + mmu_version, ntlbs, pidsz, lpidsz, rasz); + ramask = (1ull << rasz) - 1; + + for (tlb = 0; tlb < ntlbs; tlb++) { + u32 tlbcfg; + int nent, assoc, new_cc = 1; + printf("TLB %d:\n------\n", tlb); + switch(tlb) { + case 0: + tlbcfg = mfspr(SPRN_TLB0CFG); + break; + case 1: + tlbcfg = mfspr(SPRN_TLB1CFG); + break; + case 2: + tlbcfg = mfspr(SPRN_TLB2CFG); + break; + case 3: + tlbcfg = mfspr(SPRN_TLB3CFG); + break; + default: + printf("Unsupported TLB number !\n"); + continue; + } + nent = tlbcfg & 0xfff; + assoc = (tlbcfg >> 24) & 0xff; + for (i = 0; i < nent; i++) { + u32 mas0 = MAS0_TLBSEL(tlb); + u32 mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K); + u64 mas2 = 0; + u64 mas7_mas3; + int esel = i, cc = i; + + if (assoc != 0) { + cc = i / assoc; + esel = i % assoc; + mas2 = cc * 0x1000; + } + + mas0 |= MAS0_ESEL(esel); + mtspr(SPRN_MAS0, mas0); + mtspr(SPRN_MAS1, mas1); + mtspr(SPRN_MAS2, mas2); + asm volatile("tlbre 0,0,0" : : : "memory"); + mas1 = mfspr(SPRN_MAS1); + mas2 = mfspr(SPRN_MAS2); + mas7_mas3 = mfspr(SPRN_MAS7_MAS3); + if (assoc && (i % assoc) == 0) + new_cc = 1; + if (!(mas1 & MAS1_VALID)) + continue; + if (assoc == 0) + printf("%04x- ", i); + else if (new_cc) + printf("%04x-%c", cc, 'A' + esel); + else + printf(" |%c", 'A' + esel); + new_cc = 0; + printf(" %016llx %04x %s %c%c AS%c", + mas2 & ~0x3ffull, + (mas1 >> 16) & 0x3fff, + pgsz_names[(mas1 >> 7) & 0x1f], + mas1 & MAS1_IND ? 'I' : ' ', + mas1 & MAS1_IPROT ? 'P' : ' ', + mas1 & MAS1_TS ? '1' : '0'); + printf(" %c%c%c%c%c%c%c", + mas2 & MAS2_X0 ? 'a' : ' ', + mas2 & MAS2_X1 ? 'v' : ' ', + mas2 & MAS2_W ? 'w' : ' ', + mas2 & MAS2_I ? 'i' : ' ', + mas2 & MAS2_M ? 'm' : ' ', + mas2 & MAS2_G ? 'g' : ' ', + mas2 & MAS2_E ? 'e' : ' '); + printf(" %016llx", mas7_mas3 & ramask & ~0x7ffull); + if (mas1 & MAS1_IND) + printf(" %s\n", + pgsz_names[(mas7_mas3 >> 1) & 0x1f]); + else + printf(" U%c%c%c S%c%c%c\n", + mas7_mas3 & MAS3_UX ? 'x' : ' ', + mas7_mas3 & MAS3_UW ? 'w' : ' ', + mas7_mas3 & MAS3_UR ? 'r' : ' ', + mas7_mas3 & MAS3_SX ? 'x' : ' ', + mas7_mas3 & MAS3_SW ? 'w' : ' ', + mas7_mas3 & MAS3_SR ? 'r' : ' '); + } + } +} +#endif /* CONFIG_PPC_BOOK3E_64 */ + +static void xmon_init(int enable) +{ + if (enable) { + __debugger = xmon; + __debugger_ipi = xmon_ipi; + __debugger_bpt = xmon_bpt; + __debugger_sstep = xmon_sstep; + __debugger_iabr_match = xmon_iabr_match; + __debugger_break_match = xmon_break_match; + __debugger_fault_handler = xmon_fault_handler; + } else { + __debugger = NULL; + __debugger_ipi = NULL; + __debugger_bpt = NULL; + __debugger_sstep = NULL; + __debugger_iabr_match = NULL; + __debugger_break_match = NULL; + __debugger_fault_handler = NULL; + } +} + +#ifdef CONFIG_MAGIC_SYSRQ +static void sysrq_handle_xmon(u8 key) +{ + if (xmon_is_locked_down()) { + clear_all_bpt(); + xmon_init(0); + return; + } + /* ensure xmon is enabled */ + xmon_init(1); + debugger(get_irq_regs()); + if (!xmon_on) + xmon_init(0); +} + +static const struct sysrq_key_op sysrq_xmon_op = { + .handler = sysrq_handle_xmon, + .help_msg = "xmon(x)", + .action_msg = "Entering xmon", +}; + +static int __init setup_xmon_sysrq(void) +{ + register_sysrq_key('x', &sysrq_xmon_op); + return 0; +} +device_initcall(setup_xmon_sysrq); +#endif /* CONFIG_MAGIC_SYSRQ */ + +static void clear_all_bpt(void) +{ + int i; + + /* clear/unpatch all breakpoints */ + remove_bpts(); + remove_cpu_bpts(); + + /* Disable all breakpoints */ + for (i = 0; i < NBPTS; ++i) + bpts[i].enabled = 0; + + /* Clear any data or iabr breakpoints */ + iabr = NULL; + for (i = 0; i < nr_wp_slots(); i++) + dabr[i].enabled = 0; +} + +#ifdef CONFIG_DEBUG_FS +static int xmon_dbgfs_set(void *data, u64 val) +{ + xmon_on = !!val; + xmon_init(xmon_on); + + /* make sure all breakpoints removed when disabling */ + if (!xmon_on) { + clear_all_bpt(); + get_output_lock(); + printf("xmon: All breakpoints cleared\n"); + release_output_lock(); + } + + return 0; +} + +static int xmon_dbgfs_get(void *data, u64 *val) +{ + *val = xmon_on; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(xmon_dbgfs_ops, xmon_dbgfs_get, + xmon_dbgfs_set, "%llu\n"); + +static int __init setup_xmon_dbgfs(void) +{ + debugfs_create_file("xmon", 0600, arch_debugfs_dir, NULL, + &xmon_dbgfs_ops); + return 0; +} +device_initcall(setup_xmon_dbgfs); +#endif /* CONFIG_DEBUG_FS */ + +static int xmon_early __initdata; + +static int __init early_parse_xmon(char *p) +{ + if (xmon_is_locked_down()) { + xmon_init(0); + xmon_early = 0; + xmon_on = 0; + } else if (!p || strncmp(p, "early", 5) == 0) { + /* just "xmon" is equivalent to "xmon=early" */ + xmon_init(1); + xmon_early = 1; + xmon_on = 1; + } else if (strncmp(p, "on", 2) == 0) { + xmon_init(1); + xmon_on = 1; + } else if (strncmp(p, "rw", 2) == 0) { + xmon_init(1); + xmon_on = 1; + xmon_is_ro = false; + } else if (strncmp(p, "ro", 2) == 0) { + xmon_init(1); + xmon_on = 1; + xmon_is_ro = true; + } else if (strncmp(p, "off", 3) == 0) + xmon_on = 0; + else + return 1; + + return 0; +} +early_param("xmon", early_parse_xmon); + +void __init xmon_setup(void) +{ + if (xmon_on) + xmon_init(1); + if (xmon_early) + debugger(NULL); +} + +#ifdef CONFIG_SPU_BASE + +struct spu_info { + struct spu *spu; + u64 saved_mfc_sr1_RW; + u32 saved_spu_runcntl_RW; + unsigned long dump_addr; + u8 stopped_ok; +}; + +#define XMON_NUM_SPUS 16 /* Enough for current hardware */ + +static struct spu_info spu_info[XMON_NUM_SPUS]; + +void __init xmon_register_spus(struct list_head *list) +{ + struct spu *spu; + + list_for_each_entry(spu, list, full_list) { + if (spu->number >= XMON_NUM_SPUS) { + WARN_ON(1); + continue; + } + + spu_info[spu->number].spu = spu; + spu_info[spu->number].stopped_ok = 0; + spu_info[spu->number].dump_addr = (unsigned long) + spu_info[spu->number].spu->local_store; + } +} + +static void stop_spus(void) +{ + struct spu *spu; + volatile int i; + u64 tmp; + + for (i = 0; i < XMON_NUM_SPUS; i++) { + if (!spu_info[i].spu) + continue; + + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + + spu = spu_info[i].spu; + + spu_info[i].saved_spu_runcntl_RW = + in_be32(&spu->problem->spu_runcntl_RW); + + tmp = spu_mfc_sr1_get(spu); + spu_info[i].saved_mfc_sr1_RW = tmp; + + tmp &= ~MFC_STATE1_MASTER_RUN_CONTROL_MASK; + spu_mfc_sr1_set(spu, tmp); + + sync(); + __delay(200); + + spu_info[i].stopped_ok = 1; + + printf("Stopped spu %.2d (was %s)\n", i, + spu_info[i].saved_spu_runcntl_RW ? + "running" : "stopped"); + } else { + catch_memory_errors = 0; + printf("*** Error stopping spu %.2d\n", i); + } + catch_memory_errors = 0; + } +} + +static void restart_spus(void) +{ + struct spu *spu; + volatile int i; + + for (i = 0; i < XMON_NUM_SPUS; i++) { + if (!spu_info[i].spu) + continue; + + if (!spu_info[i].stopped_ok) { + printf("*** Error, spu %d was not successfully stopped" + ", not restarting\n", i); + continue; + } + + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + + spu = spu_info[i].spu; + spu_mfc_sr1_set(spu, spu_info[i].saved_mfc_sr1_RW); + out_be32(&spu->problem->spu_runcntl_RW, + spu_info[i].saved_spu_runcntl_RW); + + sync(); + __delay(200); + + printf("Restarted spu %.2d\n", i); + } else { + catch_memory_errors = 0; + printf("*** Error restarting spu %.2d\n", i); + } + catch_memory_errors = 0; + } +} + +#define DUMP_WIDTH 23 +#define DUMP_VALUE(format, field, value) \ +do { \ + if (setjmp(bus_error_jmp) == 0) { \ + catch_memory_errors = 1; \ + sync(); \ + printf(" %-*s = "format"\n", DUMP_WIDTH, \ + #field, value); \ + sync(); \ + __delay(200); \ + } else { \ + catch_memory_errors = 0; \ + printf(" %-*s = *** Error reading field.\n", \ + DUMP_WIDTH, #field); \ + } \ + catch_memory_errors = 0; \ +} while (0) + +#define DUMP_FIELD(obj, format, field) \ + DUMP_VALUE(format, field, obj->field) + +static void dump_spu_fields(struct spu *spu) +{ + printf("Dumping spu fields at address %p:\n", spu); + + DUMP_FIELD(spu, "0x%x", number); + DUMP_FIELD(spu, "%s", name); + DUMP_FIELD(spu, "0x%lx", local_store_phys); + DUMP_FIELD(spu, "0x%p", local_store); + DUMP_FIELD(spu, "0x%lx", ls_size); + DUMP_FIELD(spu, "0x%x", node); + DUMP_FIELD(spu, "0x%lx", flags); + DUMP_FIELD(spu, "%llu", class_0_pending); + DUMP_FIELD(spu, "0x%llx", class_0_dar); + DUMP_FIELD(spu, "0x%llx", class_1_dar); + DUMP_FIELD(spu, "0x%llx", class_1_dsisr); + DUMP_FIELD(spu, "0x%x", irqs[0]); + DUMP_FIELD(spu, "0x%x", irqs[1]); + DUMP_FIELD(spu, "0x%x", irqs[2]); + DUMP_FIELD(spu, "0x%x", slb_replace); + DUMP_FIELD(spu, "%d", pid); + DUMP_FIELD(spu, "0x%p", mm); + DUMP_FIELD(spu, "0x%p", ctx); + DUMP_FIELD(spu, "0x%p", rq); + DUMP_FIELD(spu, "0x%llx", timestamp); + DUMP_FIELD(spu, "0x%lx", problem_phys); + DUMP_FIELD(spu, "0x%p", problem); + DUMP_VALUE("0x%x", problem->spu_runcntl_RW, + in_be32(&spu->problem->spu_runcntl_RW)); + DUMP_VALUE("0x%x", problem->spu_status_R, + in_be32(&spu->problem->spu_status_R)); + DUMP_VALUE("0x%x", problem->spu_npc_RW, + in_be32(&spu->problem->spu_npc_RW)); + DUMP_FIELD(spu, "0x%p", priv2); + DUMP_FIELD(spu, "0x%p", pdata); +} + +static int spu_inst_dump(unsigned long adr, long count, int praddr) +{ + return generic_inst_dump(adr, count, praddr, print_insn_spu); +} + +static void dump_spu_ls(unsigned long num, int subcmd) +{ + unsigned long offset, addr, ls_addr; + + if (setjmp(bus_error_jmp) == 0) { + catch_memory_errors = 1; + sync(); + ls_addr = (unsigned long)spu_info[num].spu->local_store; + sync(); + __delay(200); + } else { + catch_memory_errors = 0; + printf("*** Error: accessing spu info for spu %ld\n", num); + return; + } + catch_memory_errors = 0; + + if (scanhex(&offset)) + addr = ls_addr + offset; + else + addr = spu_info[num].dump_addr; + + if (addr >= ls_addr + LS_SIZE) { + printf("*** Error: address outside of local store\n"); + return; + } + + switch (subcmd) { + case 'i': + addr += spu_inst_dump(addr, 16, 1); + last_cmd = "sdi\n"; + break; + default: + prdump(addr, 64); + addr += 64; + last_cmd = "sd\n"; + break; + } + + spu_info[num].dump_addr = addr; +} + +static int do_spu_cmd(void) +{ + static unsigned long num = 0; + int cmd, subcmd = 0; + + cmd = inchar(); + switch (cmd) { + case 's': + stop_spus(); + break; + case 'r': + restart_spus(); + break; + case 'd': + subcmd = inchar(); + if (isxdigit(subcmd) || subcmd == '\n') + termch = subcmd; + fallthrough; + case 'f': + scanhex(&num); + if (num >= XMON_NUM_SPUS || !spu_info[num].spu) { + printf("*** Error: invalid spu number\n"); + return 0; + } + + switch (cmd) { + case 'f': + dump_spu_fields(spu_info[num].spu); + break; + default: + dump_spu_ls(num, subcmd); + break; + } + + break; + default: + return -1; + } + + return 0; +} +#else /* ! CONFIG_SPU_BASE */ +static int do_spu_cmd(void) +{ + return -1; +} +#endif |