mirror of
https://github.com/torvalds/linux.git
synced 2024-12-29 14:21:47 +00:00
55205c916e
This change fixes a linking problem, which happens if oprofile
is selected to be compiled as built-in:
`oprofile_arch_exit' referenced in section `.init.text' of
arch/arm/oprofile/built-in.o: defined in discarded section
`.exit.text' of arch/arm/oprofile/built-in.o
The problem is appeared after commit 87121ca504, which
introduced oprofile_arch_exit() calls from __init function. Note
that the aforementioned commit has been backported to stable
branches, and the problem is known to be reproduced at least
with 3.0.13 and 3.1.5 kernels.
Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@nokia.com>
Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: oprofile-list <oprofile-list@lists.sourceforge.net>
Cc: <stable@kernel.org>
Link: http://lkml.kernel.org/r/20111222151540.GB16765@erda.amd.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
123 lines
2.7 KiB
C
123 lines
2.7 KiB
C
/**
|
|
* @file common.c
|
|
*
|
|
* @remark Copyright 2004 Oprofile Authors
|
|
* @remark Copyright 2010 ARM Ltd.
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author Zwane Mwaikambo
|
|
* @author Will Deacon [move to perf]
|
|
*/
|
|
|
|
#include <linux/cpumask.h>
|
|
#include <linux/init.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/oprofile.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <asm/stacktrace.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <asm/perf_event.h>
|
|
#include <asm/ptrace.h>
|
|
|
|
#ifdef CONFIG_HW_PERF_EVENTS
|
|
char *op_name_from_perf_id(void)
|
|
{
|
|
enum arm_perf_pmu_ids id = armpmu_get_pmu_id();
|
|
|
|
switch (id) {
|
|
case ARM_PERF_PMU_ID_XSCALE1:
|
|
return "arm/xscale1";
|
|
case ARM_PERF_PMU_ID_XSCALE2:
|
|
return "arm/xscale2";
|
|
case ARM_PERF_PMU_ID_V6:
|
|
return "arm/armv6";
|
|
case ARM_PERF_PMU_ID_V6MP:
|
|
return "arm/mpcore";
|
|
case ARM_PERF_PMU_ID_CA8:
|
|
return "arm/armv7";
|
|
case ARM_PERF_PMU_ID_CA9:
|
|
return "arm/armv7-ca9";
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static int report_trace(struct stackframe *frame, void *d)
|
|
{
|
|
unsigned int *depth = d;
|
|
|
|
if (*depth) {
|
|
oprofile_add_trace(frame->pc);
|
|
(*depth)--;
|
|
}
|
|
|
|
return *depth == 0;
|
|
}
|
|
|
|
/*
|
|
* The registers we're interested in are at the end of the variable
|
|
* length saved register structure. The fp points at the end of this
|
|
* structure so the address of this struct is:
|
|
* (struct frame_tail *)(xxx->fp)-1
|
|
*/
|
|
struct frame_tail {
|
|
struct frame_tail *fp;
|
|
unsigned long sp;
|
|
unsigned long lr;
|
|
} __attribute__((packed));
|
|
|
|
static struct frame_tail* user_backtrace(struct frame_tail *tail)
|
|
{
|
|
struct frame_tail buftail[2];
|
|
|
|
/* Also check accessibility of one struct frame_tail beyond */
|
|
if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
|
|
return NULL;
|
|
if (__copy_from_user_inatomic(buftail, tail, sizeof(buftail)))
|
|
return NULL;
|
|
|
|
oprofile_add_trace(buftail[0].lr);
|
|
|
|
/* frame pointers should strictly progress back up the stack
|
|
* (towards higher addresses) */
|
|
if (tail + 1 >= buftail[0].fp)
|
|
return NULL;
|
|
|
|
return buftail[0].fp-1;
|
|
}
|
|
|
|
static void arm_backtrace(struct pt_regs * const regs, unsigned int depth)
|
|
{
|
|
struct frame_tail *tail = ((struct frame_tail *) regs->ARM_fp) - 1;
|
|
|
|
if (!user_mode(regs)) {
|
|
struct stackframe frame;
|
|
frame.fp = regs->ARM_fp;
|
|
frame.sp = regs->ARM_sp;
|
|
frame.lr = regs->ARM_lr;
|
|
frame.pc = regs->ARM_pc;
|
|
walk_stackframe(&frame, report_trace, &depth);
|
|
return;
|
|
}
|
|
|
|
while (depth-- && tail && !((unsigned long) tail & 3))
|
|
tail = user_backtrace(tail);
|
|
}
|
|
|
|
int __init oprofile_arch_init(struct oprofile_operations *ops)
|
|
{
|
|
/* provide backtrace support also in timer mode: */
|
|
ops->backtrace = arm_backtrace;
|
|
|
|
return oprofile_perf_init(ops);
|
|
}
|
|
|
|
void oprofile_arch_exit(void)
|
|
{
|
|
oprofile_perf_exit();
|
|
}
|