projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 14f70012 DCZ |
1 | /* |
| 2 | * Linux performance counter support for MIPS. | |
| 3 | * | |
| 4 | * Copyright (C) 2010 MIPS Technologies, Inc. | |
| 5 | * Author: Deng-Cheng Zhu | |
| 6 | * | |
| 7 | * This code is based on the implementation for ARM, which is in turn | |
| 8 | * based on the sparc64 perf event code and the x86 code. Performance | |
| 7e788d96 DCZ |
9 | * counter access is based on the MIPS Oprofile code. And the callchain |
| 10 | * support references the code of MIPS stacktrace.c. | |
| 14f70012 DCZ |
11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify | |
| 13 | * it under the terms of the GNU General Public License version 2 as | |
| 14 | * published by the Free Software Foundation. | |
| 15 | */ | |
| 16 | ||
| 14f70012 | 17 | #include <linux/perf_event.h> |
| 14f70012 | 18 | |
| 14f70012 | 19 | #include <asm/stacktrace.h> |
| 3a9ab99e | 20 | |
| 7e788d96 | 21 | /* Callchain handling code. */ |
| 7e788d96 DCZ |
22 | |
| 23 | /* | |
| 24 | * Leave userspace callchain empty for now. When we find a way to trace | |
| e5dcb58a | 25 | * the user stack callchains, we will add it here. |
| 7e788d96 | 26 | */ |
| 7e788d96 DCZ |
27 | |
| 28 | static void save_raw_perf_callchain(struct perf_callchain_entry *entry, | |
| 29 | unsigned long reg29) | |
| 30 | { | |
| 31 | unsigned long *sp = (unsigned long *)reg29; | |
| 32 | unsigned long addr; | |
| 33 | ||
| 34 | while (!kstack_end(sp)) { | |
| 35 | addr = *sp++; | |
| 36 | if (__kernel_text_address(addr)) { | |
| 98f92f2f | 37 | perf_callchain_store(entry, addr); |
| 7e788d96 DCZ |
38 | if (entry->nr >= PERF_MAX_STACK_DEPTH) |
| 39 | break; | |
| 40 | } | |
| 41 | } | |
| 42 | } | |
| 43 | ||
| 98f92f2f DCZ |
44 | void perf_callchain_kernel(struct perf_callchain_entry *entry, |
| 45 | struct pt_regs *regs) | |
| 7e788d96 DCZ |
46 | { |
| 47 | unsigned long sp = regs->regs[29]; | |
| 48 | #ifdef CONFIG_KALLSYMS | |
| 49 | unsigned long ra = regs->regs[31]; | |
| 50 | unsigned long pc = regs->cp0_epc; | |
| 51 | ||
| 7e788d96 DCZ |
52 | if (raw_show_trace || !__kernel_text_address(pc)) { |
| 53 | unsigned long stack_page = | |
| 54 | (unsigned long)task_stack_page(current); | |
| 55 | if (stack_page && sp >= stack_page && | |
| 56 | sp <= stack_page + THREAD_SIZE - 32) | |
| 57 | save_raw_perf_callchain(entry, sp); | |
| 58 | return; | |
| 59 | } | |
| 60 | do { | |
| 98f92f2f | 61 | perf_callchain_store(entry, pc); |
| 7e788d96 DCZ |
62 | if (entry->nr >= PERF_MAX_STACK_DEPTH) |
| 63 | break; | |
| 64 | pc = unwind_stack(current, &sp, pc, &ra); | |
| 65 | } while (pc); | |
| 66 | #else | |
| 7e788d96 DCZ |
67 | save_raw_perf_callchain(entry, sp); |
| 68 | #endif | |
| 69 | } |