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Diffstat (limited to 'arch/um/kernel/sysrq.c')
-rw-r--r--arch/um/kernel/sysrq.c32
1 files changed, 23 insertions, 9 deletions
diff --git a/arch/um/kernel/sysrq.c b/arch/um/kernel/sysrq.c
index 33cc72e26c6e..7122bf9c753e 100644
--- a/arch/um/kernel/sysrq.c
+++ b/arch/um/kernel/sysrq.c
@@ -12,6 +12,7 @@
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/sysrq.h>
+#include <os.h>
struct stack_frame {
struct stack_frame *next_frame;
@@ -48,29 +49,42 @@ static void print_stack_trace(unsigned long *sp, unsigned long bp)
/*Stolen from arch/i386/kernel/traps.c */
static const int kstack_depth_to_print = 24;
-static unsigned long get_frame_pointer(struct task_struct *task)
+static unsigned long get_frame_pointer(struct task_struct *task,
+ struct pt_regs *segv_regs)
{
if (!task || task == current)
- return current_bp();
+ return segv_regs ? PT_REGS_BP(segv_regs) : current_bp();
else
return KSTK_EBP(task);
}
+static unsigned long *get_stack_pointer(struct task_struct *task,
+ struct pt_regs *segv_regs)
+{
+ if (!task || task == current)
+ return segv_regs ? (unsigned long *)PT_REGS_SP(segv_regs) : current_sp();
+ else
+ return (unsigned long *)KSTK_ESP(task);
+}
+
void show_stack(struct task_struct *task, unsigned long *stack)
{
unsigned long *sp = stack, bp = 0;
+ struct pt_regs *segv_regs = current->thread.segv_regs;
int i;
+ if (!segv_regs && os_is_signal_stack()) {
+ printk(KERN_ERR "Received SIGSEGV in SIGSEGV handler,"
+ " aborting stack trace!\n");
+ return;
+ }
+
#ifdef CONFIG_FRAME_POINTER
- bp = get_frame_pointer(task);
+ bp = get_frame_pointer(task, segv_regs);
#endif
- if (!stack) {
- if (!task || task == current)
- sp = current_sp();
- else
- sp = (unsigned long *)KSTK_ESP(task);
- }
+ if (!stack)
+ sp = get_stack_pointer(task, segv_regs);
printk(KERN_INFO "Stack:\n");
stack = sp;