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authorJan Beulich <jbeulich@novell.com>2006-06-26 13:57:41 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 10:48:17 -0700
commit176a2718f408ce92788b29127050b04dfd6e4f68 (patch)
treebb637b13098f821551d07d3a13d140a908e7bc04 /arch
parentdffead4e421e289c8434351400d24fd35723e874 (diff)
[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 <jbeulich@novell.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/i386/kernel/entry.S29
-rw-r--r--arch/i386/kernel/process.c2
-rw-r--r--arch/i386/kernel/traps.c50
-rw-r--r--arch/i386/kernel/vmlinux.lds.S9
4 files changed, 79 insertions, 11 deletions
diff --git a/arch/i386/kernel/entry.S b/arch/i386/kernel/entry.S
index cfc683f153b9..e802f3cac7e3 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 6259afea46d1..525432e3fef7 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, &regs->esp);
+ show_trace(NULL, regs, &regs->esp);
}
/*
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index dcc14477af1f..286584667865 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -28,6 +28,7 @@
#include <linux/utsname.h>
#include <linux/kprobes.h>
#include <linux/kexec.h>
+#include <linux/unwind.h>
#ifdef CONFIG_EISA
#include <linux/ioport.h>
@@ -47,7 +48,7 @@
#include <asm/desc.h>
#include <asm/i387.h>
#include <asm/nmi.h>
-
+#include <asm/unwind.h>
#include <asm/smp.h>
#include <asm/arch_hooks.h>
#include <asm/kdebug.h>
@@ -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 7512f39c9f25..2d4f1386e2b1 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)