From 176a2718f408ce92788b29127050b04dfd6e4f68 Mon Sep 17 00:00:00 2001 From: Jan Beulich Date: Mon, 26 Jun 2006 13:57:41 +0200 Subject: [PATCH] i386: reliable stack trace support (i386) These are the i386-specific pieces to enable reliable stack traces. This is going to be even more useful once CFI annotations get added to he assembly code, namely to entry.S. Signed-off-by: Jan Beulich Signed-off-by: Andi Kleen Signed-off-by: Linus Torvalds --- arch/i386/kernel/entry.S | 29 ++++++++++++++++++++++++ arch/i386/kernel/process.c | 2 +- arch/i386/kernel/traps.c | 50 +++++++++++++++++++++++++++++++++--------- arch/i386/kernel/vmlinux.lds.S | 9 ++++++++ 4 files changed, 79 insertions(+), 11 deletions(-) (limited to 'arch/i386') diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S index cfc683f153b..e802f3cac7e 100644 --- a/arch/i386/kernel/entry.S +++ b/arch/i386/kernel/entry.S @@ -663,6 +663,35 @@ ENTRY(spurious_interrupt_bug) pushl $do_spurious_interrupt_bug jmp error_code +#ifdef CONFIG_STACK_UNWIND +ENTRY(arch_unwind_init_running) + movl 4(%esp), %edx + movl (%esp), %ecx + leal 4(%esp), %eax + movl %ebx, EBX(%edx) + xorl %ebx, %ebx + movl %ebx, ECX(%edx) + movl %ebx, EDX(%edx) + movl %esi, ESI(%edx) + movl %edi, EDI(%edx) + movl %ebp, EBP(%edx) + movl %ebx, EAX(%edx) + movl $__USER_DS, DS(%edx) + movl $__USER_DS, ES(%edx) + movl %ebx, ORIG_EAX(%edx) + movl %ecx, EIP(%edx) + movl 12(%esp), %ecx + movl $__KERNEL_CS, CS(%edx) + movl %ebx, EFLAGS(%edx) + movl %eax, OLDESP(%edx) + movl 8(%esp), %eax + movl %ecx, 8(%esp) + movl EBX(%edx), %ebx + movl $__KERNEL_DS, OLDSS(%edx) + jmpl *%eax +ENDPROC(arch_unwind_init_running) +#endif + .section .rodata,"a" #include "syscall_table.S" diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c index 6259afea46d..525432e3fef 100644 --- a/arch/i386/kernel/process.c +++ b/arch/i386/kernel/process.c @@ -312,7 +312,7 @@ void show_regs(struct pt_regs * regs) cr3 = read_cr3(); cr4 = read_cr4_safe(); printk("CR0: %08lx CR2: %08lx CR3: %08lx CR4: %08lx\n", cr0, cr2, cr3, cr4); - show_trace(NULL, ®s->esp); + show_trace(NULL, regs, ®s->esp); } /* diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c index dcc14477af1..28658466786 100644 --- a/arch/i386/kernel/traps.c +++ b/arch/i386/kernel/traps.c @@ -28,6 +28,7 @@ #include #include #include +#include #ifdef CONFIG_EISA #include @@ -47,7 +48,7 @@ #include #include #include - +#include #include #include #include @@ -170,14 +171,43 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo, return ebp; } -static void show_trace_log_lvl(struct task_struct *task, +static asmlinkage void show_trace_unwind(struct unwind_frame_info *info, void *log_lvl) +{ + int printed = 0; /* nr of entries already printed on current line */ + + while (unwind(info) == 0 && UNW_PC(info)) { + printed = print_addr_and_symbol(UNW_PC(info), log_lvl, printed); + if (arch_unw_user_mode(info)) + break; + } + if (printed) + printk("\n"); +} + +static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs, unsigned long *stack, char *log_lvl) { unsigned long ebp; + struct unwind_frame_info info; if (!task) task = current; + if (regs) { + if (unwind_init_frame_info(&info, task, regs) == 0) { + show_trace_unwind(&info, log_lvl); + return; + } + } else if (task == current) { + if (unwind_init_running(&info, show_trace_unwind, log_lvl) == 0) + return; + } else { + if (unwind_init_blocked(&info, task) == 0) { + show_trace_unwind(&info, log_lvl); + return; + } + } + if (task == current) { /* Grab ebp right from our regs */ asm ("movl %%ebp, %0" : "=r" (ebp) : ); @@ -198,13 +228,13 @@ static void show_trace_log_lvl(struct task_struct *task, } } -void show_trace(struct task_struct *task, unsigned long * stack) +void show_trace(struct task_struct *task, struct pt_regs *regs, unsigned long * stack) { - show_trace_log_lvl(task, stack, ""); + show_trace_log_lvl(task, regs, stack, ""); } -static void show_stack_log_lvl(struct task_struct *task, unsigned long *esp, - char *log_lvl) +static void show_stack_log_lvl(struct task_struct *task, struct pt_regs *regs, + unsigned long *esp, char *log_lvl) { unsigned long *stack; int i; @@ -225,13 +255,13 @@ static void show_stack_log_lvl(struct task_struct *task, unsigned long *esp, printk("%08lx ", *stack++); } printk("\n%sCall Trace:\n", log_lvl); - show_trace_log_lvl(task, esp, log_lvl); + show_trace_log_lvl(task, regs, esp, log_lvl); } void show_stack(struct task_struct *task, unsigned long *esp) { printk(" "); - show_stack_log_lvl(task, esp, ""); + show_stack_log_lvl(task, NULL, esp, ""); } /* @@ -241,7 +271,7 @@ void dump_stack(void) { unsigned long stack; - show_trace(current, &stack); + show_trace(current, NULL, &stack); } EXPORT_SYMBOL(dump_stack); @@ -285,7 +315,7 @@ void show_registers(struct pt_regs *regs) u8 __user *eip; printk("\n" KERN_EMERG "Stack: "); - show_stack_log_lvl(NULL, (unsigned long *)esp, KERN_EMERG); + show_stack_log_lvl(NULL, regs, (unsigned long *)esp, KERN_EMERG); printk(KERN_EMERG "Code: "); diff --git a/arch/i386/kernel/vmlinux.lds.S b/arch/i386/kernel/vmlinux.lds.S index 7512f39c9f2..2d4f1386e2b 100644 --- a/arch/i386/kernel/vmlinux.lds.S +++ b/arch/i386/kernel/vmlinux.lds.S @@ -71,6 +71,15 @@ SECTIONS .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) { *(.data.read_mostly) } _edata = .; /* End of data section */ +#ifdef CONFIG_STACK_UNWIND + . = ALIGN(4); + .eh_frame : AT(ADDR(.eh_frame) - LOAD_OFFSET) { + __start_unwind = .; + *(.eh_frame) + __end_unwind = .; + } +#endif + . = ALIGN(THREAD_SIZE); /* init_task */ .data.init_task : AT(ADDR(.data.init_task) - LOAD_OFFSET) { *(.data.init_task) -- cgit v1.2.2