mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2025-09-04 20:19:47 +08:00
024b58f3d9
Noticed this when workin on warnings. As unhandled_exception is used in entry.S we should attribute it with asmlinkage. Signed-off-by: Stafford Horne <shorne@gmail.com>
470 lines
12 KiB
C
470 lines
12 KiB
C
// 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>
|
|
|
|
static int kstack_depth_to_print = 0x180;
|
|
int lwa_flag;
|
|
static unsigned long __user *lwa_addr;
|
|
|
|
static 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);
|
|
}
|
|
|
|
static void print_data(unsigned long base_addr, unsigned long word, int i)
|
|
{
|
|
if (i == 0)
|
|
printk("(%08lx:)\t%08lx", base_addr + (i * 4), word);
|
|
else
|
|
printk(" %08lx:\t%08lx", base_addr + (i * 4), word);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
if (esp < PAGE_OFFSET)
|
|
goto bad_stack;
|
|
|
|
printk("\n");
|
|
for (i = -8; i < 24; i += 1) {
|
|
unsigned long word;
|
|
|
|
if (__get_user(word, &((unsigned long *)esp)[i])) {
|
|
bad_stack:
|
|
printk(" Bad Stack value.");
|
|
break;
|
|
}
|
|
|
|
print_data(esp, word, i);
|
|
}
|
|
|
|
printk("\nCode: ");
|
|
if (regs->pc < PAGE_OFFSET)
|
|
goto bad;
|
|
|
|
for (i = -6; i < 6; i += 1) {
|
|
unsigned long word;
|
|
|
|
if (__get_user(word, &((unsigned long *)regs->pc)[i])) {
|
|
bad:
|
|
printk(" Bad PC value.");
|
|
break;
|
|
}
|
|
|
|
print_data(regs->pc, word, i);
|
|
}
|
|
}
|
|
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 long word;
|
|
|
|
word = ((unsigned long *)(__pa(regs->pc)))[i];
|
|
|
|
print_data(regs->pc, word, i);
|
|
}
|
|
printk("\n");
|
|
}
|
|
|
|
/* This is normally the 'Oops' routine */
|
|
void __noreturn 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);
|
|
}
|
|
|
|
asmlinkage 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);
|
|
}
|
|
|
|
asmlinkage void do_trap(struct pt_regs *regs, unsigned long address)
|
|
{
|
|
force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->pc);
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|