diff options
Diffstat (limited to 'arch/xtensa/kernel/traps.c')
| -rw-r--r-- | arch/xtensa/kernel/traps.c | 102 |
1 files changed, 81 insertions, 21 deletions
diff --git a/arch/xtensa/kernel/traps.c b/arch/xtensa/kernel/traps.c index f0a7d1c2641e..17eb180eff7c 100644 --- a/arch/xtensa/kernel/traps.c +++ b/arch/xtensa/kernel/traps.c @@ -54,9 +54,10 @@ static void do_interrupt(struct pt_regs *regs); #if XTENSA_FAKE_NMI static void do_nmi(struct pt_regs *regs); #endif -#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION -static void do_unaligned_user(struct pt_regs *regs); +#ifdef CONFIG_XTENSA_LOAD_STORE +static void do_load_store(struct pt_regs *regs); #endif +static void do_unaligned_user(struct pt_regs *regs); static void do_multihit(struct pt_regs *regs); #if XTENSA_HAVE_COPROCESSORS static void do_coprocessor(struct pt_regs *regs); @@ -91,7 +92,10 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = { { EXCCAUSE_SYSTEM_CALL, USER, fast_syscall_user }, { EXCCAUSE_SYSTEM_CALL, 0, system_call }, /* EXCCAUSE_INSTRUCTION_FETCH unhandled */ -/* EXCCAUSE_LOAD_STORE_ERROR unhandled*/ +#ifdef CONFIG_XTENSA_LOAD_STORE +{ EXCCAUSE_LOAD_STORE_ERROR, USER|KRNL, fast_load_store }, +{ EXCCAUSE_LOAD_STORE_ERROR, 0, do_load_store }, +#endif { EXCCAUSE_LEVEL1_INTERRUPT, 0, do_interrupt }, #ifdef SUPPORT_WINDOWED { EXCCAUSE_ALLOCA, USER|KRNL, fast_alloca }, @@ -102,9 +106,9 @@ static dispatch_init_table_t __initdata dispatch_init_table[] = { #ifdef CONFIG_XTENSA_UNALIGNED_USER { EXCCAUSE_UNALIGNED, USER, fast_unaligned }, #endif -{ EXCCAUSE_UNALIGNED, 0, do_unaligned_user }, { EXCCAUSE_UNALIGNED, KRNL, fast_unaligned }, #endif +{ EXCCAUSE_UNALIGNED, 0, do_unaligned_user }, #ifdef CONFIG_MMU { EXCCAUSE_ITLB_MISS, 0, do_page_fault }, { EXCCAUSE_ITLB_MISS, USER|KRNL, fast_second_level_miss}, @@ -171,6 +175,23 @@ __die_if_kernel(const char *str, struct pt_regs *regs, long err) die(str, regs, err); } +#ifdef CONFIG_PRINT_USER_CODE_ON_UNHANDLED_EXCEPTION +static inline void dump_user_code(struct pt_regs *regs) +{ + char buf[32]; + + if (copy_from_user(buf, (void __user *)(regs->pc & -16), sizeof(buf)) == 0) { + print_hex_dump(KERN_INFO, " ", DUMP_PREFIX_NONE, + 32, 1, buf, sizeof(buf), false); + + } +} +#else +static inline void dump_user_code(struct pt_regs *regs) +{ +} +#endif + /* * Unhandled Exceptions. Kill user task or panic if in kernel space. */ @@ -186,6 +207,7 @@ void do_unhandled(struct pt_regs *regs) "\tEXCCAUSE is %ld\n", current->comm, task_pid_nr(current), regs->pc, regs->exccause); + dump_user_code(regs); force_sig(SIGILL); } @@ -349,6 +371,19 @@ static void do_div0(struct pt_regs *regs) force_sig_fault(SIGFPE, FPE_INTDIV, (void __user *)regs->pc); } +#ifdef CONFIG_XTENSA_LOAD_STORE +static void do_load_store(struct pt_regs *regs) +{ + __die_if_kernel("Unhandled load/store exception in kernel", + regs, SIGKILL); + + pr_info_ratelimited("Load/store error to %08lx in '%s' (pid = %d, pc = %#010lx)\n", + regs->excvaddr, current->comm, + task_pid_nr(current), regs->pc); + force_sig_fault(SIGBUS, BUS_ADRERR, (void *)regs->excvaddr); +} +#endif + /* * Handle unaligned memory accesses from user space. Kill task. * @@ -356,7 +391,6 @@ static void do_div0(struct pt_regs *regs) * accesses causes from user space. */ -#if XCHAL_UNALIGNED_LOAD_EXCEPTION || XCHAL_UNALIGNED_STORE_EXCEPTION static void do_unaligned_user(struct pt_regs *regs) { __die_if_kernel("Unhandled unaligned exception in kernel", @@ -368,7 +402,6 @@ static void do_unaligned_user(struct pt_regs *regs) task_pid_nr(current), regs->pc); force_sig_fault(SIGBUS, BUS_ADRALN, (void *) regs->excvaddr); } -#endif #if XTENSA_HAVE_COPROCESSORS static void do_coprocessor(struct pt_regs *regs) @@ -534,31 +567,58 @@ static void show_trace(struct task_struct *task, unsigned long *sp, } #define STACK_DUMP_ENTRY_SIZE 4 -#define STACK_DUMP_LINE_SIZE 32 +#define STACK_DUMP_LINE_SIZE 16 static size_t kstack_depth_to_print = CONFIG_PRINT_STACK_DEPTH; -void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl) +struct stack_fragment { - size_t len, off = 0; - - if (!sp) - sp = stack_pointer(task); + size_t len; + size_t off; + u8 *sp; + const char *loglvl; +}; - len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE), - kstack_depth_to_print * STACK_DUMP_ENTRY_SIZE); +static int show_stack_fragment_cb(struct stackframe *frame, void *data) +{ + struct stack_fragment *sf = data; - printk("%sStack:\n", loglvl); - while (off < len) { + while (sf->off < sf->len) { u8 line[STACK_DUMP_LINE_SIZE]; - size_t line_len = len - off > STACK_DUMP_LINE_SIZE ? - STACK_DUMP_LINE_SIZE : len - off; + size_t line_len = sf->len - sf->off > STACK_DUMP_LINE_SIZE ? + STACK_DUMP_LINE_SIZE : sf->len - sf->off; + bool arrow = sf->off == 0; - __memcpy(line, (u8 *)sp + off, line_len); - print_hex_dump(loglvl, " ", DUMP_PREFIX_NONE, + if (frame && frame->sp == (unsigned long)(sf->sp + sf->off)) + arrow = true; + + __memcpy(line, sf->sp + sf->off, line_len); + print_hex_dump(sf->loglvl, arrow ? "> " : " ", DUMP_PREFIX_NONE, STACK_DUMP_LINE_SIZE, STACK_DUMP_ENTRY_SIZE, line, line_len, false); - off += STACK_DUMP_LINE_SIZE; + sf->off += STACK_DUMP_LINE_SIZE; + if (arrow) + return 0; } + return 1; +} + +void show_stack(struct task_struct *task, unsigned long *sp, const char *loglvl) +{ + struct stack_fragment sf; + + if (!sp) + sp = stack_pointer(task); + + sf.len = min((-(size_t)sp) & (THREAD_SIZE - STACK_DUMP_ENTRY_SIZE), + kstack_depth_to_print * STACK_DUMP_ENTRY_SIZE); + sf.off = 0; + sf.sp = (u8 *)sp; + sf.loglvl = loglvl; + + printk("%sStack:\n", loglvl); + walk_stackframe(sp, show_stack_fragment_cb, &sf); + while (sf.off < sf.len) + show_stack_fragment_cb(NULL, &sf); show_trace(task, sp, loglvl); } |