diff options
author | Jonas Bonn <jonas@southpole.se> | 2011-06-04 19:35:30 (GMT) |
---|---|---|
committer | Jonas Bonn <jonas@southpole.se> | 2011-07-22 16:46:38 (GMT) |
commit | 769a8a96229e6b2f1e3a2b3b38e27981f7fb9902 (patch) | |
tree | 5581b5cdf41f79bae25a2c933a26ec61a15bbc56 /arch/openrisc/kernel | |
parent | 5a2bbb8f64848b5cf9d626f3f17bac6718c91874 (diff) | |
download | linux-769a8a96229e6b2f1e3a2b3b38e27981f7fb9902.tar.xz |
OpenRISC: Traps
Signed-off-by: Jonas Bonn <jonas@southpole.se>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/openrisc/kernel')
-rw-r--r-- | arch/openrisc/kernel/traps.c | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/arch/openrisc/kernel/traps.c b/arch/openrisc/kernel/traps.c new file mode 100644 index 0000000..a4ec44a --- /dev/null +++ b/arch/openrisc/kernel/traps.c @@ -0,0 +1,366 @@ +/* + * 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> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + * 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/kernel.h> +#include <linux/module.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 <asm/uaccess.h> + +#include <asm/system.h> +#include <asm/segment.h> +#include <asm/io.h> +#include <asm/pgtable.h> + +extern char _etext, _stext; + +int kstack_depth_to_print = 0x180; + +static inline int valid_stack_ptr(struct thread_info *tinfo, void *p) +{ + return p > (void *)tinfo && p < (void *)tinfo + THREAD_SIZE - 3; +} + +void show_trace(struct task_struct *task, unsigned long *stack) +{ + struct thread_info *context; + unsigned long addr; + + context = (struct thread_info *) + ((unsigned long)stack & (~(THREAD_SIZE - 1))); + + while (valid_stack_ptr(context, stack)) { + addr = *stack++; + if (__kernel_text_address(addr)) { + printk(" [<%08lx>]", addr); + print_symbol(" %s", addr); + printk("\n"); + } + } + printk(" =======================\n"); +} + +/* displays a short stack trace */ +void show_stack(struct task_struct *task, unsigned long *esp) +{ + unsigned long addr, *stack; + int i; + + if (esp == NULL) + esp = (unsigned long *)&esp; + + stack = esp; + + printk("Stack dump [0x%08lx]:\n", (unsigned long)esp); + for (i = 0; i < kstack_depth_to_print; i++) { + if (kstack_end(stack)) + break; + if (__get_user(addr, stack)) { + /* This message matches "failing address" marked + s390 in ksymoops, so lines containing it will + not be filtered out by ksymoops. */ + printk("Failing address 0x%lx\n", (unsigned long)stack); + break; + } + stack++; + + printk("sp + %02d: 0x%08lx\n", i * 4, addr); + } + printk("\n"); + + show_trace(task, esp); + + return; +} + +void show_trace_task(struct task_struct *tsk) +{ + /* + * TODO: SysRq-T trace dump... + */ +} + +/* + * The architecture-independent backtrace generator + */ +void dump_stack(void) +{ + unsigned long stack; + + show_stack(current, &stack); +} + +void show_registers(struct pt_regs *regs) +{ + int i; + int in_kernel = 1; + unsigned long esp; + + esp = (unsigned long)(®s->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 syscallno: %08lx\n", + regs->gpr[11], regs->orig_gpr11, regs->syscallno); + + 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); + + 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 syscallno: %08lx\n", + regs->gpr[11], regs->orig_gpr11, regs->syscallno); + + 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); +} + +void __init trap_init(void) +{ + /* Nothing needs to be done */ +} + +asmlinkage void do_trap(struct pt_regs *regs, unsigned long address) +{ + siginfo_t info; + memset(&info, 0, sizeof(info)); + info.si_signo = SIGTRAP; + info.si_code = TRAP_TRACE; + info.si_addr = (void *)address; + force_sig_info(SIGTRAP, &info, current); + + regs->pc += 4; +} + +asmlinkage void do_unaligned_access(struct pt_regs *regs, unsigned long address) +{ + siginfo_t info; + + if (user_mode(regs)) { + /* Send a SIGSEGV */ + info.si_signo = SIGSEGV; + info.si_errno = 0; + /* info.si_code has been set above */ + info.si_addr = (void *)address; + force_sig_info(SIGSEGV, &info, current); + } 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) +{ + siginfo_t info; + + if (user_mode(regs)) { + /* Send a SIGBUS */ + info.si_signo = SIGBUS; + info.si_errno = 0; + info.si_code = BUS_ADRERR; + info.si_addr = (void *)address; + force_sig_info(SIGBUS, &info, current); + } else { /* Kernel mode */ + printk("KERNEL: Bus error (SIGBUS) 0x%.8lx\n", address); + show_registers(regs); + die("Die:", regs, address); + } +} + +asmlinkage void do_illegal_instruction(struct pt_regs *regs, + unsigned long address) +{ + siginfo_t info; + + if (user_mode(regs)) { + /* Send a SIGILL */ + info.si_signo = SIGILL; + info.si_errno = 0; + info.si_code = ILL_ILLOPC; + info.si_addr = (void *)address; + force_sig_info(SIGBUS, &info, current); + } else { /* Kernel mode */ + printk("KERNEL: Illegal instruction (SIGILL) 0x%.8lx\n", + address); + show_registers(regs); + die("Die:", regs, address); + } +} |