+++ /dev/null
-/**
- * @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
-
-/*
- * OProfile has a curious naming scheme for the ARM PMUs, but they are
- * part of the user ABI so we need to map from the perf PMU name for
- * supported PMUs.
- */
-static struct op_perf_name {
- char *perf_name;
- char *op_name;
-} op_perf_name_map[] = {
- { "armv5_xscale1", "arm/xscale1" },
- { "armv5_xscale2", "arm/xscale2" },
- { "armv6_1136", "arm/armv6" },
- { "armv6_1156", "arm/armv6" },
- { "armv6_1176", "arm/armv6" },
- { "armv6_11mpcore", "arm/mpcore" },
- { "armv7_cortex_a8", "arm/armv7" },
- { "armv7_cortex_a9", "arm/armv7-ca9" },
-};
-
-char *op_name_from_perf_id(void)
-{
- int i;
- struct op_perf_name names;
- const char *perf_name = perf_pmu_name();
-
- for (i = 0; i < ARRAY_SIZE(op_perf_name_map); ++i) {
- names = op_perf_name_map[i];
- if (!strcmp(names.perf_name, perf_name))
- return names.op_name;
- }
-
- 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(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;
- arm_get_current_stackframe(regs, &frame);
- 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();
-}
projects / thirdparty / kernel / linux.git / commitdiff
