From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/x86/kernel/kgdb.c | 785 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 785 insertions(+) create mode 100644 arch/x86/kernel/kgdb.c (limited to 'arch/x86/kernel/kgdb.c') diff --git a/arch/x86/kernel/kgdb.c b/arch/x86/kernel/kgdb.c new file mode 100644 index 000000000..3a43a2dee --- /dev/null +++ b/arch/x86/kernel/kgdb.c @@ -0,0 +1,785 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + */ + +/* + * Copyright (C) 2004 Amit S. Kale + * Copyright (C) 2000-2001 VERITAS Software Corporation. + * Copyright (C) 2002 Andi Kleen, SuSE Labs + * Copyright (C) 2004 LinSysSoft Technologies Pvt. Ltd. + * Copyright (C) 2007 MontaVista Software, Inc. + * Copyright (C) 2007-2008 Jason Wessel, Wind River Systems, Inc. + */ +/**************************************************************************** + * Contributor: Lake Stevens Instrument Division$ + * Written by: Glenn Engel $ + * Updated by: Amit Kale + * Updated by: Tom Rini + * Updated by: Jason Wessel + * Modified for 386 by Jim Kingdon, Cygnus Support. + * Original kgdb, compatibility with 2.1.xx kernel by + * David Grothe + * Integrated into 2.2.5 kernel by Tigran Aivazian + * X86_64 changes from Andi Kleen's patch merged by Jim Houston + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include + +struct dbg_reg_def_t dbg_reg_def[DBG_MAX_REG_NUM] = +{ +#ifdef CONFIG_X86_32 + { "ax", 4, offsetof(struct pt_regs, ax) }, + { "cx", 4, offsetof(struct pt_regs, cx) }, + { "dx", 4, offsetof(struct pt_regs, dx) }, + { "bx", 4, offsetof(struct pt_regs, bx) }, + { "sp", 4, offsetof(struct pt_regs, sp) }, + { "bp", 4, offsetof(struct pt_regs, bp) }, + { "si", 4, offsetof(struct pt_regs, si) }, + { "di", 4, offsetof(struct pt_regs, di) }, + { "ip", 4, offsetof(struct pt_regs, ip) }, + { "flags", 4, offsetof(struct pt_regs, flags) }, + { "cs", 4, offsetof(struct pt_regs, cs) }, + { "ss", 4, offsetof(struct pt_regs, ss) }, + { "ds", 4, offsetof(struct pt_regs, ds) }, + { "es", 4, offsetof(struct pt_regs, es) }, +#else + { "ax", 8, offsetof(struct pt_regs, ax) }, + { "bx", 8, offsetof(struct pt_regs, bx) }, + { "cx", 8, offsetof(struct pt_regs, cx) }, + { "dx", 8, offsetof(struct pt_regs, dx) }, + { "si", 8, offsetof(struct pt_regs, si) }, + { "di", 8, offsetof(struct pt_regs, di) }, + { "bp", 8, offsetof(struct pt_regs, bp) }, + { "sp", 8, offsetof(struct pt_regs, sp) }, + { "r8", 8, offsetof(struct pt_regs, r8) }, + { "r9", 8, offsetof(struct pt_regs, r9) }, + { "r10", 8, offsetof(struct pt_regs, r10) }, + { "r11", 8, offsetof(struct pt_regs, r11) }, + { "r12", 8, offsetof(struct pt_regs, r12) }, + { "r13", 8, offsetof(struct pt_regs, r13) }, + { "r14", 8, offsetof(struct pt_regs, r14) }, + { "r15", 8, offsetof(struct pt_regs, r15) }, + { "ip", 8, offsetof(struct pt_regs, ip) }, + { "flags", 4, offsetof(struct pt_regs, flags) }, + { "cs", 4, offsetof(struct pt_regs, cs) }, + { "ss", 4, offsetof(struct pt_regs, ss) }, + { "ds", 4, -1 }, + { "es", 4, -1 }, +#endif + { "fs", 4, -1 }, + { "gs", 4, -1 }, +}; + +int dbg_set_reg(int regno, void *mem, struct pt_regs *regs) +{ + if ( +#ifdef CONFIG_X86_32 + regno == GDB_SS || regno == GDB_FS || regno == GDB_GS || +#endif + regno == GDB_SP || regno == GDB_ORIG_AX) + return 0; + + if (dbg_reg_def[regno].offset != -1) + memcpy((void *)regs + dbg_reg_def[regno].offset, mem, + dbg_reg_def[regno].size); + return 0; +} + +char *dbg_get_reg(int regno, void *mem, struct pt_regs *regs) +{ + if (regno == GDB_ORIG_AX) { + memcpy(mem, ®s->orig_ax, sizeof(regs->orig_ax)); + return "orig_ax"; + } + if (regno >= DBG_MAX_REG_NUM || regno < 0) + return NULL; + + if (dbg_reg_def[regno].offset != -1) + memcpy(mem, (void *)regs + dbg_reg_def[regno].offset, + dbg_reg_def[regno].size); + +#ifdef CONFIG_X86_32 + switch (regno) { + case GDB_GS: + case GDB_FS: + *(unsigned long *)mem = 0xFFFF; + break; + } +#endif + return dbg_reg_def[regno].name; +} + +/** + * sleeping_thread_to_gdb_regs - Convert ptrace regs to GDB regs + * @gdb_regs: A pointer to hold the registers in the order GDB wants. + * @p: The &struct task_struct of the desired process. + * + * Convert the register values of the sleeping process in @p to + * the format that GDB expects. + * This function is called when kgdb does not have access to the + * &struct pt_regs and therefore it should fill the gdb registers + * @gdb_regs with what has been saved in &struct thread_struct + * thread field during switch_to. + */ +void sleeping_thread_to_gdb_regs(unsigned long *gdb_regs, struct task_struct *p) +{ +#ifndef CONFIG_X86_32 + u32 *gdb_regs32 = (u32 *)gdb_regs; +#endif + gdb_regs[GDB_AX] = 0; + gdb_regs[GDB_BX] = 0; + gdb_regs[GDB_CX] = 0; + gdb_regs[GDB_DX] = 0; + gdb_regs[GDB_SI] = 0; + gdb_regs[GDB_DI] = 0; + gdb_regs[GDB_BP] = ((struct inactive_task_frame *)p->thread.sp)->bp; +#ifdef CONFIG_X86_32 + gdb_regs[GDB_DS] = __KERNEL_DS; + gdb_regs[GDB_ES] = __KERNEL_DS; + gdb_regs[GDB_PS] = 0; + gdb_regs[GDB_CS] = __KERNEL_CS; + gdb_regs[GDB_SS] = __KERNEL_DS; + gdb_regs[GDB_FS] = 0xFFFF; + gdb_regs[GDB_GS] = 0xFFFF; +#else + gdb_regs32[GDB_PS] = 0; + gdb_regs32[GDB_CS] = __KERNEL_CS; + gdb_regs32[GDB_SS] = __KERNEL_DS; + gdb_regs[GDB_R8] = 0; + gdb_regs[GDB_R9] = 0; + gdb_regs[GDB_R10] = 0; + gdb_regs[GDB_R11] = 0; + gdb_regs[GDB_R12] = 0; + gdb_regs[GDB_R13] = 0; + gdb_regs[GDB_R14] = 0; + gdb_regs[GDB_R15] = 0; +#endif + gdb_regs[GDB_PC] = 0; + gdb_regs[GDB_SP] = p->thread.sp; +} + +static struct hw_breakpoint { + unsigned enabled; + unsigned long addr; + int len; + int type; + struct perf_event * __percpu *pev; +} breakinfo[HBP_NUM]; + +static unsigned long early_dr7; + +static void kgdb_correct_hw_break(void) +{ + int breakno; + + for (breakno = 0; breakno < HBP_NUM; breakno++) { + struct perf_event *bp; + struct arch_hw_breakpoint *info; + int val; + int cpu = raw_smp_processor_id(); + if (!breakinfo[breakno].enabled) + continue; + if (dbg_is_early) { + set_debugreg(breakinfo[breakno].addr, breakno); + early_dr7 |= encode_dr7(breakno, + breakinfo[breakno].len, + breakinfo[breakno].type); + set_debugreg(early_dr7, 7); + continue; + } + bp = *per_cpu_ptr(breakinfo[breakno].pev, cpu); + info = counter_arch_bp(bp); + if (bp->attr.disabled != 1) + continue; + bp->attr.bp_addr = breakinfo[breakno].addr; + bp->attr.bp_len = breakinfo[breakno].len; + bp->attr.bp_type = breakinfo[breakno].type; + info->address = breakinfo[breakno].addr; + info->len = breakinfo[breakno].len; + info->type = breakinfo[breakno].type; + val = arch_install_hw_breakpoint(bp); + if (!val) + bp->attr.disabled = 0; + } + if (!dbg_is_early) + hw_breakpoint_restore(); +} + +static int hw_break_reserve_slot(int breakno) +{ + int cpu; + int cnt = 0; + struct perf_event **pevent; + + if (dbg_is_early) + return 0; + + for_each_online_cpu(cpu) { + cnt++; + pevent = per_cpu_ptr(breakinfo[breakno].pev, cpu); + if (dbg_reserve_bp_slot(*pevent)) + goto fail; + } + + return 0; + +fail: + for_each_online_cpu(cpu) { + cnt--; + if (!cnt) + break; + pevent = per_cpu_ptr(breakinfo[breakno].pev, cpu); + dbg_release_bp_slot(*pevent); + } + return -1; +} + +static int hw_break_release_slot(int breakno) +{ + struct perf_event **pevent; + int cpu; + + if (dbg_is_early) + return 0; + + for_each_online_cpu(cpu) { + pevent = per_cpu_ptr(breakinfo[breakno].pev, cpu); + if (dbg_release_bp_slot(*pevent)) + /* + * The debugger is responsible for handing the retry on + * remove failure. + */ + return -1; + } + return 0; +} + +static int +kgdb_remove_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype) +{ + int i; + + for (i = 0; i < HBP_NUM; i++) + if (breakinfo[i].addr == addr && breakinfo[i].enabled) + break; + if (i == HBP_NUM) + return -1; + + if (hw_break_release_slot(i)) { + printk(KERN_ERR "Cannot remove hw breakpoint at %lx\n", addr); + return -1; + } + breakinfo[i].enabled = 0; + + return 0; +} + +static void kgdb_remove_all_hw_break(void) +{ + int i; + int cpu = raw_smp_processor_id(); + struct perf_event *bp; + + for (i = 0; i < HBP_NUM; i++) { + if (!breakinfo[i].enabled) + continue; + bp = *per_cpu_ptr(breakinfo[i].pev, cpu); + if (!bp->attr.disabled) { + arch_uninstall_hw_breakpoint(bp); + bp->attr.disabled = 1; + continue; + } + if (dbg_is_early) + early_dr7 &= ~encode_dr7(i, breakinfo[i].len, + breakinfo[i].type); + else if (hw_break_release_slot(i)) + printk(KERN_ERR "KGDB: hw bpt remove failed %lx\n", + breakinfo[i].addr); + breakinfo[i].enabled = 0; + } +} + +static int +kgdb_set_hw_break(unsigned long addr, int len, enum kgdb_bptype bptype) +{ + int i; + + for (i = 0; i < HBP_NUM; i++) + if (!breakinfo[i].enabled) + break; + if (i == HBP_NUM) + return -1; + + switch (bptype) { + case BP_HARDWARE_BREAKPOINT: + len = 1; + breakinfo[i].type = X86_BREAKPOINT_EXECUTE; + break; + case BP_WRITE_WATCHPOINT: + breakinfo[i].type = X86_BREAKPOINT_WRITE; + break; + case BP_ACCESS_WATCHPOINT: + breakinfo[i].type = X86_BREAKPOINT_RW; + break; + default: + return -1; + } + switch (len) { + case 1: + breakinfo[i].len = X86_BREAKPOINT_LEN_1; + break; + case 2: + breakinfo[i].len = X86_BREAKPOINT_LEN_2; + break; + case 4: + breakinfo[i].len = X86_BREAKPOINT_LEN_4; + break; +#ifdef CONFIG_X86_64 + case 8: + breakinfo[i].len = X86_BREAKPOINT_LEN_8; + break; +#endif + default: + return -1; + } + breakinfo[i].addr = addr; + if (hw_break_reserve_slot(i)) { + breakinfo[i].addr = 0; + return -1; + } + breakinfo[i].enabled = 1; + + return 0; +} + +/** + * kgdb_disable_hw_debug - Disable hardware debugging while we in kgdb. + * @regs: Current &struct pt_regs. + * + * This function will be called if the particular architecture must + * disable hardware debugging while it is processing gdb packets or + * handling exception. + */ +static void kgdb_disable_hw_debug(struct pt_regs *regs) +{ + int i; + int cpu = raw_smp_processor_id(); + struct perf_event *bp; + + /* Disable hardware debugging while we are in kgdb: */ + set_debugreg(0UL, 7); + for (i = 0; i < HBP_NUM; i++) { + if (!breakinfo[i].enabled) + continue; + if (dbg_is_early) { + early_dr7 &= ~encode_dr7(i, breakinfo[i].len, + breakinfo[i].type); + continue; + } + bp = *per_cpu_ptr(breakinfo[i].pev, cpu); + if (bp->attr.disabled == 1) + continue; + arch_uninstall_hw_breakpoint(bp); + bp->attr.disabled = 1; + } +} + +#ifdef CONFIG_SMP +/** + * kgdb_roundup_cpus - Get other CPUs into a holding pattern + * + * On SMP systems, we need to get the attention of the other CPUs + * and get them be in a known state. This should do what is needed + * to get the other CPUs to call kgdb_wait(). Note that on some arches, + * the NMI approach is not used for rounding up all the CPUs. For example, + * in case of MIPS, smp_call_function() is used to roundup CPUs. + * + * On non-SMP systems, this is not called. + */ +void kgdb_roundup_cpus(void) +{ + apic_send_IPI_allbutself(NMI_VECTOR); +} +#endif + +/** + * kgdb_arch_handle_exception - Handle architecture specific GDB packets. + * @e_vector: The error vector of the exception that happened. + * @signo: The signal number of the exception that happened. + * @err_code: The error code of the exception that happened. + * @remcomInBuffer: The buffer of the packet we have read. + * @remcomOutBuffer: The buffer of %BUFMAX bytes to write a packet into. + * @linux_regs: The &struct pt_regs of the current process. + * + * This function MUST handle the 'c' and 's' command packets, + * as well packets to set / remove a hardware breakpoint, if used. + * If there are additional packets which the hardware needs to handle, + * they are handled here. The code should return -1 if it wants to + * process more packets, and a %0 or %1 if it wants to exit from the + * kgdb callback. + */ +int kgdb_arch_handle_exception(int e_vector, int signo, int err_code, + char *remcomInBuffer, char *remcomOutBuffer, + struct pt_regs *linux_regs) +{ + unsigned long addr; + char *ptr; + + switch (remcomInBuffer[0]) { + case 'c': + case 's': + /* try to read optional parameter, pc unchanged if no parm */ + ptr = &remcomInBuffer[1]; + if (kgdb_hex2long(&ptr, &addr)) + linux_regs->ip = addr; + fallthrough; + case 'D': + case 'k': + /* clear the trace bit */ + linux_regs->flags &= ~X86_EFLAGS_TF; + atomic_set(&kgdb_cpu_doing_single_step, -1); + + /* set the trace bit if we're stepping */ + if (remcomInBuffer[0] == 's') { + linux_regs->flags |= X86_EFLAGS_TF; + atomic_set(&kgdb_cpu_doing_single_step, + raw_smp_processor_id()); + } + + return 0; + } + + /* this means that we do not want to exit from the handler: */ + return -1; +} + +static inline int +single_step_cont(struct pt_regs *regs, struct die_args *args) +{ + /* + * Single step exception from kernel space to user space so + * eat the exception and continue the process: + */ + printk(KERN_ERR "KGDB: trap/step from kernel to user space, " + "resuming...\n"); + kgdb_arch_handle_exception(args->trapnr, args->signr, + args->err, "c", "", regs); + /* + * Reset the BS bit in dr6 (pointed by args->err) to + * denote completion of processing + */ + (*(unsigned long *)ERR_PTR(args->err)) &= ~DR_STEP; + + return NOTIFY_STOP; +} + +static DECLARE_BITMAP(was_in_debug_nmi, NR_CPUS); + +static int kgdb_nmi_handler(unsigned int cmd, struct pt_regs *regs) +{ + int cpu; + + switch (cmd) { + case NMI_LOCAL: + if (atomic_read(&kgdb_active) != -1) { + /* KGDB CPU roundup */ + cpu = raw_smp_processor_id(); + kgdb_nmicallback(cpu, regs); + set_bit(cpu, was_in_debug_nmi); + touch_nmi_watchdog(); + + return NMI_HANDLED; + } + break; + + case NMI_UNKNOWN: + cpu = raw_smp_processor_id(); + + if (__test_and_clear_bit(cpu, was_in_debug_nmi)) + return NMI_HANDLED; + + break; + default: + /* do nothing */ + break; + } + return NMI_DONE; +} + +static int __kgdb_notify(struct die_args *args, unsigned long cmd) +{ + struct pt_regs *regs = args->regs; + + switch (cmd) { + case DIE_DEBUG: + if (atomic_read(&kgdb_cpu_doing_single_step) != -1) { + if (user_mode(regs)) + return single_step_cont(regs, args); + break; + } else if (test_thread_flag(TIF_SINGLESTEP)) + /* This means a user thread is single stepping + * a system call which should be ignored + */ + return NOTIFY_DONE; + fallthrough; + default: + if (user_mode(regs)) + return NOTIFY_DONE; + } + + if (kgdb_handle_exception(args->trapnr, args->signr, cmd, regs)) + return NOTIFY_DONE; + + /* Must touch watchdog before return to normal operation */ + touch_nmi_watchdog(); + return NOTIFY_STOP; +} + +int kgdb_ll_trap(int cmd, const char *str, + struct pt_regs *regs, long err, int trap, int sig) +{ + struct die_args args = { + .regs = regs, + .str = str, + .err = err, + .trapnr = trap, + .signr = sig, + + }; + + if (!kgdb_io_module_registered) + return NOTIFY_DONE; + + return __kgdb_notify(&args, cmd); +} + +static int +kgdb_notify(struct notifier_block *self, unsigned long cmd, void *ptr) +{ + unsigned long flags; + int ret; + + local_irq_save(flags); + ret = __kgdb_notify(ptr, cmd); + local_irq_restore(flags); + + return ret; +} + +static struct notifier_block kgdb_notifier = { + .notifier_call = kgdb_notify, +}; + +/** + * kgdb_arch_init - Perform any architecture specific initialization. + * + * This function will handle the initialization of any architecture + * specific callbacks. + */ +int kgdb_arch_init(void) +{ + int retval; + + retval = register_die_notifier(&kgdb_notifier); + if (retval) + goto out; + + retval = register_nmi_handler(NMI_LOCAL, kgdb_nmi_handler, + 0, "kgdb"); + if (retval) + goto out1; + + retval = register_nmi_handler(NMI_UNKNOWN, kgdb_nmi_handler, + 0, "kgdb"); + + if (retval) + goto out2; + + return retval; + +out2: + unregister_nmi_handler(NMI_LOCAL, "kgdb"); +out1: + unregister_die_notifier(&kgdb_notifier); +out: + return retval; +} + +static void kgdb_hw_overflow_handler(struct perf_event *event, + struct perf_sample_data *data, struct pt_regs *regs) +{ + struct task_struct *tsk = current; + int i; + + for (i = 0; i < 4; i++) { + if (breakinfo[i].enabled) + tsk->thread.virtual_dr6 |= (DR_TRAP0 << i); + } +} + +void kgdb_arch_late(void) +{ + int i, cpu; + struct perf_event_attr attr; + struct perf_event **pevent; + + /* + * Pre-allocate the hw breakpoint instructions in the non-atomic + * portion of kgdb because this operation requires mutexs to + * complete. + */ + hw_breakpoint_init(&attr); + attr.bp_addr = (unsigned long)kgdb_arch_init; + attr.bp_len = HW_BREAKPOINT_LEN_1; + attr.bp_type = HW_BREAKPOINT_W; + attr.disabled = 1; + for (i = 0; i < HBP_NUM; i++) { + if (breakinfo[i].pev) + continue; + breakinfo[i].pev = register_wide_hw_breakpoint(&attr, NULL, NULL); + if (IS_ERR((void * __force)breakinfo[i].pev)) { + printk(KERN_ERR "kgdb: Could not allocate hw" + "breakpoints\nDisabling the kernel debugger\n"); + breakinfo[i].pev = NULL; + kgdb_arch_exit(); + return; + } + for_each_online_cpu(cpu) { + pevent = per_cpu_ptr(breakinfo[i].pev, cpu); + pevent[0]->hw.sample_period = 1; + pevent[0]->overflow_handler = kgdb_hw_overflow_handler; + if (pevent[0]->destroy != NULL) { + pevent[0]->destroy = NULL; + release_bp_slot(*pevent); + } + } + } +} + +/** + * kgdb_arch_exit - Perform any architecture specific uninitalization. + * + * This function will handle the uninitalization of any architecture + * specific callbacks, for dynamic registration and unregistration. + */ +void kgdb_arch_exit(void) +{ + int i; + for (i = 0; i < 4; i++) { + if (breakinfo[i].pev) { + unregister_wide_hw_breakpoint(breakinfo[i].pev); + breakinfo[i].pev = NULL; + } + } + unregister_nmi_handler(NMI_UNKNOWN, "kgdb"); + unregister_nmi_handler(NMI_LOCAL, "kgdb"); + unregister_die_notifier(&kgdb_notifier); +} + +/** + * + * kgdb_skipexception - Bail out of KGDB when we've been triggered. + * @exception: Exception vector number + * @regs: Current &struct pt_regs. + * + * On some architectures we need to skip a breakpoint exception when + * it occurs after a breakpoint has been removed. + * + * Skip an int3 exception when it occurs after a breakpoint has been + * removed. Backtrack eip by 1 since the int3 would have caused it to + * increment by 1. + */ +int kgdb_skipexception(int exception, struct pt_regs *regs) +{ + if (exception == 3 && kgdb_isremovedbreak(regs->ip - 1)) { + regs->ip -= 1; + return 1; + } + return 0; +} + +unsigned long kgdb_arch_pc(int exception, struct pt_regs *regs) +{ + if (exception == 3) + return instruction_pointer(regs) - 1; + return instruction_pointer(regs); +} + +void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip) +{ + regs->ip = ip; +} + +int kgdb_arch_set_breakpoint(struct kgdb_bkpt *bpt) +{ + int err; + + bpt->type = BP_BREAKPOINT; + err = copy_from_kernel_nofault(bpt->saved_instr, (char *)bpt->bpt_addr, + BREAK_INSTR_SIZE); + if (err) + return err; + err = copy_to_kernel_nofault((char *)bpt->bpt_addr, + arch_kgdb_ops.gdb_bpt_instr, BREAK_INSTR_SIZE); + if (!err) + return err; + /* + * It is safe to call text_poke_kgdb() because normal kernel execution + * is stopped on all cores, so long as the text_mutex is not locked. + */ + if (mutex_is_locked(&text_mutex)) + return -EBUSY; + text_poke_kgdb((void *)bpt->bpt_addr, arch_kgdb_ops.gdb_bpt_instr, + BREAK_INSTR_SIZE); + bpt->type = BP_POKE_BREAKPOINT; + + return 0; +} + +int kgdb_arch_remove_breakpoint(struct kgdb_bkpt *bpt) +{ + if (bpt->type != BP_POKE_BREAKPOINT) + goto knl_write; + /* + * It is safe to call text_poke_kgdb() because normal kernel execution + * is stopped on all cores, so long as the text_mutex is not locked. + */ + if (mutex_is_locked(&text_mutex)) + goto knl_write; + text_poke_kgdb((void *)bpt->bpt_addr, bpt->saved_instr, + BREAK_INSTR_SIZE); + return 0; + +knl_write: + return copy_to_kernel_nofault((char *)bpt->bpt_addr, + (char *)bpt->saved_instr, BREAK_INSTR_SIZE); +} + +const struct kgdb_arch arch_kgdb_ops = { + /* Breakpoint instruction: */ + .gdb_bpt_instr = { 0xcc }, + .flags = KGDB_HW_BREAKPOINT, + .set_hw_breakpoint = kgdb_set_hw_break, + .remove_hw_breakpoint = kgdb_remove_hw_break, + .disable_hw_break = kgdb_disable_hw_debug, + .remove_all_hw_break = kgdb_remove_all_hw_break, + .correct_hw_break = kgdb_correct_hw_break, +}; -- cgit v1.2.3