forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
458 lines
11 KiB
458 lines
11 KiB
// 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 <[email protected]> |
|
* Copyright (C) 2010-2011 Jonas Bonn <[email protected]> |
|
* |
|
* 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 |
|
do_exit(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); |
|
} |
|
|
|
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); |
|
} |
|
}
|
|
|