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-rw-r--r--arch/openrisc/kernel/traps.c465
1 files changed, 465 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c
new file mode 100644
index 000000000..fca5317f3
--- /dev/null
+++ b/arch/openrisc/kernel/traps.c
@@ -0,0 +1,465 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * OpenRISC traps.c
+ *
+ * Linux architectural port borrowing liberally from similar works of
+ * others. All original copyrights apply as per the original source
+ * declaration.
+ *
+ * Modifications for the OpenRISC architecture:
+ * Copyright (C) 2003 Matjaz Breskvar <phoenix@bsemi.com>
+ * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se>
+ *
+ * Here we handle the break vectors not used by the system call
+ * mechanism, as well as some general stack/register dumping
+ * things.
+ */
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/sched/debug.h>
+#include <linux/sched/task_stack.h>
+#include <linux/kernel.h>
+#include <linux/extable.h>
+#include <linux/kmod.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/ptrace.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/kallsyms.h>
+#include <linux/uaccess.h>
+
+#include <asm/io.h>
+#include <asm/unwinder.h>
+#include <asm/sections.h>
+
+int kstack_depth_to_print = 0x180;
+int lwa_flag;
+unsigned long __user *lwa_addr;
+
+void print_trace(void *data, unsigned long addr, int reliable)
+{
+ const char *loglvl = data;
+
+ printk("%s[<%p>] %s%pS\n", loglvl, (void *) addr, reliable ? "" : "? ",
+ (void *) addr);
+}
+
+/* displays a short stack trace */
+void show_stack(struct task_struct *task, unsigned long *esp, const char *loglvl)
+{
+ if (esp == NULL)
+ esp = (unsigned long *)&esp;
+
+ printk("%sCall trace:\n", loglvl);
+ unwind_stack((void *)loglvl, esp, print_trace);
+}
+
+void show_registers(struct pt_regs *regs)
+{
+ int i;
+ int in_kernel = 1;
+ unsigned long esp;
+
+ esp = (unsigned long)(regs->sp);
+ if (user_mode(regs))
+ in_kernel = 0;
+
+ printk("CPU #: %d\n"
+ " PC: %08lx SR: %08lx SP: %08lx\n",
+ smp_processor_id(), regs->pc, regs->sr, regs->sp);
+ printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
+ 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
+ printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
+ regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
+ printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
+ regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
+ printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
+ regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
+ printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
+ regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
+ printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
+ regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
+ printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
+ regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
+ printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
+ regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
+ printk(" RES: %08lx oGPR11: %08lx\n",
+ regs->gpr[11], regs->orig_gpr11);
+
+ printk("Process %s (pid: %d, stackpage=%08lx)\n",
+ current->comm, current->pid, (unsigned long)current);
+ /*
+ * When in-kernel, we also print out the stack and code at the
+ * time of the fault..
+ */
+ if (in_kernel) {
+
+ printk("\nStack: ");
+ show_stack(NULL, (unsigned long *)esp, KERN_EMERG);
+
+ printk("\nCode: ");
+ if (regs->pc < PAGE_OFFSET)
+ goto bad;
+
+ for (i = -24; i < 24; i++) {
+ unsigned char c;
+ if (__get_user(c, &((unsigned char *)regs->pc)[i])) {
+bad:
+ printk(" Bad PC value.");
+ break;
+ }
+
+ if (i == 0)
+ printk("(%02x) ", c);
+ else
+ printk("%02x ", c);
+ }
+ }
+ printk("\n");
+}
+
+void nommu_dump_state(struct pt_regs *regs,
+ unsigned long ea, unsigned long vector)
+{
+ int i;
+ unsigned long addr, stack = regs->sp;
+
+ printk("\n\r[nommu_dump_state] :: ea %lx, vector %lx\n\r", ea, vector);
+
+ printk("CPU #: %d\n"
+ " PC: %08lx SR: %08lx SP: %08lx\n",
+ 0, regs->pc, regs->sr, regs->sp);
+ printk("GPR00: %08lx GPR01: %08lx GPR02: %08lx GPR03: %08lx\n",
+ 0L, regs->gpr[1], regs->gpr[2], regs->gpr[3]);
+ printk("GPR04: %08lx GPR05: %08lx GPR06: %08lx GPR07: %08lx\n",
+ regs->gpr[4], regs->gpr[5], regs->gpr[6], regs->gpr[7]);
+ printk("GPR08: %08lx GPR09: %08lx GPR10: %08lx GPR11: %08lx\n",
+ regs->gpr[8], regs->gpr[9], regs->gpr[10], regs->gpr[11]);
+ printk("GPR12: %08lx GPR13: %08lx GPR14: %08lx GPR15: %08lx\n",
+ regs->gpr[12], regs->gpr[13], regs->gpr[14], regs->gpr[15]);
+ printk("GPR16: %08lx GPR17: %08lx GPR18: %08lx GPR19: %08lx\n",
+ regs->gpr[16], regs->gpr[17], regs->gpr[18], regs->gpr[19]);
+ printk("GPR20: %08lx GPR21: %08lx GPR22: %08lx GPR23: %08lx\n",
+ regs->gpr[20], regs->gpr[21], regs->gpr[22], regs->gpr[23]);
+ printk("GPR24: %08lx GPR25: %08lx GPR26: %08lx GPR27: %08lx\n",
+ regs->gpr[24], regs->gpr[25], regs->gpr[26], regs->gpr[27]);
+ printk("GPR28: %08lx GPR29: %08lx GPR30: %08lx GPR31: %08lx\n",
+ regs->gpr[28], regs->gpr[29], regs->gpr[30], regs->gpr[31]);
+ printk(" RES: %08lx oGPR11: %08lx\n",
+ regs->gpr[11], regs->orig_gpr11);
+
+ printk("Process %s (pid: %d, stackpage=%08lx)\n",
+ ((struct task_struct *)(__pa(current)))->comm,
+ ((struct task_struct *)(__pa(current)))->pid,
+ (unsigned long)current);
+
+ printk("\nStack: ");
+ printk("Stack dump [0x%08lx]:\n", (unsigned long)stack);
+ for (i = 0; i < kstack_depth_to_print; i++) {
+ if (((long)stack & (THREAD_SIZE - 1)) == 0)
+ break;
+ stack++;
+
+ printk("%lx :: sp + %02d: 0x%08lx\n", stack, i * 4,
+ *((unsigned long *)(__pa(stack))));
+ }
+ printk("\n");
+
+ printk("Call Trace: ");
+ i = 1;
+ while (((long)stack & (THREAD_SIZE - 1)) != 0) {
+ addr = *((unsigned long *)__pa(stack));
+ stack++;
+
+ if (kernel_text_address(addr)) {
+ if (i && ((i % 6) == 0))
+ printk("\n ");
+ printk(" [<%08lx>]", addr);
+ i++;
+ }
+ }
+ printk("\n");
+
+ printk("\nCode: ");
+
+ for (i = -24; i < 24; i++) {
+ unsigned char c;
+ c = ((unsigned char *)(__pa(regs->pc)))[i];
+
+ if (i == 0)
+ printk("(%02x) ", c);
+ else
+ printk("%02x ", c);
+ }
+ printk("\n");
+}
+
+/* This is normally the 'Oops' routine */
+void die(const char *str, struct pt_regs *regs, long err)
+{
+
+ console_verbose();
+ printk("\n%s#: %04lx\n", str, err & 0xffff);
+ show_registers(regs);
+#ifdef CONFIG_JUMP_UPON_UNHANDLED_EXCEPTION
+ printk("\n\nUNHANDLED_EXCEPTION: entering infinite loop\n");
+
+ /* shut down interrupts */
+ local_irq_disable();
+
+ __asm__ __volatile__("l.nop 1");
+ do {} while (1);
+#endif
+ make_task_dead(SIGSEGV);
+}
+
+/* This is normally the 'Oops' routine */
+void die_if_kernel(const char *str, struct pt_regs *regs, long err)
+{
+ if (user_mode(regs))
+ return;
+
+ die(str, regs, err);
+}
+
+void unhandled_exception(struct pt_regs *regs, int ea, int vector)
+{
+ printk("Unable to handle exception at EA =0x%x, vector 0x%x",
+ ea, vector);
+ die("Oops", regs, 9);
+}
+
+void __init trap_init(void)
+{
+ /* Nothing needs to be done */
+}
+
+asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
+{
+ force_sig_fault(SIGTRAP, TRAP_TRACE, (void __user *)address);
+
+ regs->pc += 4;
+}
+
+asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address)
+{
+ if (user_mode(regs)) {
+ /* Send a SIGBUS */
+ force_sig_fault(SIGBUS, BUS_ADRALN, (void __user *)address);
+ } else {
+ printk("KERNEL: Unaligned Access 0x%.8lx\n", address);
+ show_registers(regs);
+ die("Die:", regs, address);
+ }
+
+}
+
+asmlinkage void do_bus_fault(struct pt_regs *regs, unsigned long address)
+{
+ if (user_mode(regs)) {
+ /* Send a SIGBUS */
+ force_sig_fault(SIGBUS, BUS_ADRERR, (void __user *)address);
+ } else { /* Kernel mode */
+ printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address);
+ show_registers(regs);
+ die("Die:", regs, address);
+ }
+}
+
+static inline int in_delay_slot(struct pt_regs *regs)
+{
+#ifdef CONFIG_OPENRISC_NO_SPR_SR_DSX
+ /* No delay slot flag, do the old way */
+ unsigned int op, insn;
+
+ insn = *((unsigned int *)regs->pc);
+ op = insn >> 26;
+ switch (op) {
+ case 0x00: /* l.j */
+ case 0x01: /* l.jal */
+ case 0x03: /* l.bnf */
+ case 0x04: /* l.bf */
+ case 0x11: /* l.jr */
+ case 0x12: /* l.jalr */
+ return 1;
+ default:
+ return 0;
+ }
+#else
+ return mfspr(SPR_SR) & SPR_SR_DSX;
+#endif
+}
+
+static inline void adjust_pc(struct pt_regs *regs, unsigned long address)
+{
+ int displacement;
+ unsigned int rb, op, jmp;
+
+ if (unlikely(in_delay_slot(regs))) {
+ /* In delay slot, instruction at pc is a branch, simulate it */
+ jmp = *((unsigned int *)regs->pc);
+
+ displacement = sign_extend32(((jmp) & 0x3ffffff) << 2, 27);
+ rb = (jmp & 0x0000ffff) >> 11;
+ op = jmp >> 26;
+
+ switch (op) {
+ case 0x00: /* l.j */
+ regs->pc += displacement;
+ return;
+ case 0x01: /* l.jal */
+ regs->pc += displacement;
+ regs->gpr[9] = regs->pc + 8;
+ return;
+ case 0x03: /* l.bnf */
+ if (regs->sr & SPR_SR_F)
+ regs->pc += 8;
+ else
+ regs->pc += displacement;
+ return;
+ case 0x04: /* l.bf */
+ if (regs->sr & SPR_SR_F)
+ regs->pc += displacement;
+ else
+ regs->pc += 8;
+ return;
+ case 0x11: /* l.jr */
+ regs->pc = regs->gpr[rb];
+ return;
+ case 0x12: /* l.jalr */
+ regs->pc = regs->gpr[rb];
+ regs->gpr[9] = regs->pc + 8;
+ return;
+ default:
+ break;
+ }
+ } else {
+ regs->pc += 4;
+ }
+}
+
+static inline void simulate_lwa(struct pt_regs *regs, unsigned long address,
+ unsigned int insn)
+{
+ unsigned int ra, rd;
+ unsigned long value;
+ unsigned long orig_pc;
+ long imm;
+
+ const struct exception_table_entry *entry;
+
+ orig_pc = regs->pc;
+ adjust_pc(regs, address);
+
+ ra = (insn >> 16) & 0x1f;
+ rd = (insn >> 21) & 0x1f;
+ imm = (short)insn;
+ lwa_addr = (unsigned long __user *)(regs->gpr[ra] + imm);
+
+ if ((unsigned long)lwa_addr & 0x3) {
+ do_unaligned_access(regs, address);
+ return;
+ }
+
+ if (get_user(value, lwa_addr)) {
+ if (user_mode(regs)) {
+ force_sig(SIGSEGV);
+ return;
+ }
+
+ if ((entry = search_exception_tables(orig_pc))) {
+ regs->pc = entry->fixup;
+ return;
+ }
+
+ /* kernel access in kernel space, load it directly */
+ value = *((unsigned long *)lwa_addr);
+ }
+
+ lwa_flag = 1;
+ regs->gpr[rd] = value;
+}
+
+static inline void simulate_swa(struct pt_regs *regs, unsigned long address,
+ unsigned int insn)
+{
+ unsigned long __user *vaddr;
+ unsigned long orig_pc;
+ unsigned int ra, rb;
+ long imm;
+
+ const struct exception_table_entry *entry;
+
+ orig_pc = regs->pc;
+ adjust_pc(regs, address);
+
+ ra = (insn >> 16) & 0x1f;
+ rb = (insn >> 11) & 0x1f;
+ imm = (short)(((insn & 0x2200000) >> 10) | (insn & 0x7ff));
+ vaddr = (unsigned long __user *)(regs->gpr[ra] + imm);
+
+ if (!lwa_flag || vaddr != lwa_addr) {
+ regs->sr &= ~SPR_SR_F;
+ return;
+ }
+
+ if ((unsigned long)vaddr & 0x3) {
+ do_unaligned_access(regs, address);
+ return;
+ }
+
+ if (put_user(regs->gpr[rb], vaddr)) {
+ if (user_mode(regs)) {
+ force_sig(SIGSEGV);
+ return;
+ }
+
+ if ((entry = search_exception_tables(orig_pc))) {
+ regs->pc = entry->fixup;
+ return;
+ }
+
+ /* kernel access in kernel space, store it directly */
+ *((unsigned long *)vaddr) = regs->gpr[rb];
+ }
+
+ lwa_flag = 0;
+ regs->sr |= SPR_SR_F;
+}
+
+#define INSN_LWA 0x1b
+#define INSN_SWA 0x33
+
+asmlinkage void do_illegal_instruction(struct pt_regs *regs,
+ unsigned long address)
+{
+ unsigned int op;
+ unsigned int insn = *((unsigned int *)address);
+
+ op = insn >> 26;
+
+ switch (op) {
+ case INSN_LWA:
+ simulate_lwa(regs, address, insn);
+ return;
+
+ case INSN_SWA:
+ simulate_swa(regs, address, insn);
+ return;
+
+ default:
+ break;
+ }
+
+ if (user_mode(regs)) {
+ /* Send a SIGILL */
+ force_sig_fault(SIGILL, ILL_ILLOPC, (void __user *)address);
+ } else { /* Kernel mode */
+ printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n",
+ address);
+ show_registers(regs);
+ die("Die:", regs, address);
+ }
+}
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