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Diffstat (limited to 'arch/x86/kernel/dumpstack.c')
-rw-r--r--arch/x86/kernel/dumpstack.c31
1 files changed, 22 insertions, 9 deletions
diff --git a/arch/x86/kernel/dumpstack.c b/arch/x86/kernel/dumpstack.c
index 5fa110699ed2..afbecff161d1 100644
--- a/arch/x86/kernel/dumpstack.c
+++ b/arch/x86/kernel/dumpstack.c
@@ -76,12 +76,23 @@ void show_iret_regs(struct pt_regs *regs)
regs->sp, regs->flags);
}
-static void show_regs_safe(struct stack_info *info, struct pt_regs *regs)
+static void show_regs_if_on_stack(struct stack_info *info, struct pt_regs *regs,
+ bool partial)
{
- if (on_stack(info, regs, sizeof(*regs)))
+ /*
+ * These on_stack() checks aren't strictly necessary: the unwind code
+ * has already validated the 'regs' pointer. The checks are done for
+ * ordering reasons: if the registers are on the next stack, we don't
+ * want to print them out yet. Otherwise they'll be shown as part of
+ * the wrong stack. Later, when show_trace_log_lvl() switches to the
+ * next stack, this function will be called again with the same regs so
+ * they can be printed in the right context.
+ */
+ if (!partial && on_stack(info, regs, sizeof(*regs))) {
__show_regs(regs, 0);
- else if (on_stack(info, (void *)regs + IRET_FRAME_OFFSET,
- IRET_FRAME_SIZE)) {
+
+ } else if (partial && on_stack(info, (void *)regs + IRET_FRAME_OFFSET,
+ IRET_FRAME_SIZE)) {
/*
* When an interrupt or exception occurs in entry code, the
* full pt_regs might not have been saved yet. In that case
@@ -98,11 +109,13 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
struct stack_info stack_info = {0};
unsigned long visit_mask = 0;
int graph_idx = 0;
+ bool partial;
printk("%sCall Trace:\n", log_lvl);
unwind_start(&state, task, regs, stack);
stack = stack ? : get_stack_pointer(task, regs);
+ regs = unwind_get_entry_regs(&state, &partial);
/*
* Iterate through the stacks, starting with the current stack pointer.
@@ -120,7 +133,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
* - hardirq stack
* - entry stack
*/
- for (regs = NULL; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
+ for ( ; stack; stack = PTR_ALIGN(stack_info.next_sp, sizeof(long))) {
const char *stack_name;
if (get_stack_info(stack, task, &stack_info, &visit_mask)) {
@@ -140,7 +153,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
printk("%s <%s>\n", log_lvl, stack_name);
if (regs)
- show_regs_safe(&stack_info, regs);
+ show_regs_if_on_stack(&stack_info, regs, partial);
/*
* Scan the stack, printing any text addresses we find. At the
@@ -164,7 +177,7 @@ void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
/*
* Don't print regs->ip again if it was already printed
- * by show_regs_safe() below.
+ * by show_regs_if_on_stack().
*/
if (regs && stack == &regs->ip)
goto next;
@@ -199,9 +212,9 @@ next:
unwind_next_frame(&state);
/* if the frame has entry regs, print them */
- regs = unwind_get_entry_regs(&state);
+ regs = unwind_get_entry_regs(&state, &partial);
if (regs)
- show_regs_safe(&stack_info, regs);
+ show_regs_if_on_stack(&stack_info, regs, partial);
}
if (stack_name)