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[ARM] Add stacktrace support and make oprofile use it

Forráskód böngészése 
Add support for stacktrace.  Use the new stacktrace code with
oprofile instead of it's version; there's no point having
multiple versions of stacktracing in the kernel.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2007-04-28 09:59:37 +01:00
committed by Russell King
szülő ed519dede3
commit f16fb1ecc5
5 fájl változott, egészen pontosan 109 új sor hozzáadva és 54 régi sor törölve
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69
arch/arm/oprofile/backtrace.c
Fájl megtekintése

@@ -19,6 +19,19 @@
#include <asm/ptrace.h>
#include <asm/uaccess.h>
#include "../kernel/stacktrace.h"
static int report_trace(struct stackframe *frame, void *d)
{
unsigned int *depth = d;
if (*depth) {
oprofile_add_trace(frame->lr);
(*depth)--;
}
return *depth == 0;
}
/*
* The registers we're interested in are at the end of the variable
@@ -32,21 +45,6 @@ struct frame_tail {
unsigned long lr;
} __attribute__((packed));
#ifdef CONFIG_FRAME_POINTER
static struct frame_tail* kernel_backtrace(struct frame_tail *tail)
{
oprofile_add_trace(tail->lr);
/* frame pointers should strictly progress back up the stack
* (towards higher addresses) */
if (tail >= tail->fp)
return NULL;
return tail->fp-1;
}
#endif
static struct frame_tail* user_backtrace(struct frame_tail *tail)
{
struct frame_tail buftail[2];
@@ -67,47 +65,14 @@ static struct frame_tail* user_backtrace(struct frame_tail *tail)
return buftail[0].fp-1;
}
/*
* | | /\ Higher addresses
* | |
* --------------- stack base (address of current_thread_info)
* | thread info |
* . .
* | stack |
* --------------- saved regs->ARM_fp value if valid (frame_tail address)
* . .
* --------------- struct pt_regs stored on stack (struct pt_regs *)
* | |
* . .
* | |
* --------------- %esp
* | |
* | | \/ Lower addresses
*
* Thus, &pt_regs <-> stack base restricts the valid(ish) fp values
*/
static int valid_kernel_stack(struct frame_tail *tail, struct pt_regs *regs)
{
unsigned long tailaddr = (unsigned long)tail;
unsigned long stack = (unsigned long)regs;
unsigned long stack_base = (stack & ~(THREAD_SIZE - 1)) + THREAD_SIZE;
return (tailaddr > stack) && (tailaddr < stack_base);
}
void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
{
struct frame_tail *tail;
tail = ((struct frame_tail *) regs->ARM_fp) - 1;
struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1;
if (!user_mode(regs)) {
#ifdef CONFIG_FRAME_POINTER
while (depth-- && tail && valid_kernel_stack(tail, regs)) {
tail = kernel_backtrace(tail);
}
#endif
unsigned long base = ((unsigned long)regs) & ~(THREAD_SIZE - 1);
walk_stackframe(regs->ARM_fp, base, base + THREAD_SIZE,
report_trace, &depth);
return;
}