4018994f3d
Introducing PERF_SAMPLE_REGS_USER sample type bit to trigger the dump of user level registers on sample. Registers we want to dump are specified by sample_regs_user bitmask. Only user level registers are dumped at the moment. Meaning the register values of the user space context as it was before the user entered the kernel for whatever reason (syscall, irq, exception, or a PMI happening in userspace). The layout of the sample_regs_user bitmap is described in asm/perf_regs.h for archs that support register dump. This is going to be useful to bring Dwarf CFI based stack unwinding on top of samples. Original-patch-by: Frederic Weisbecker <fweisbec@gmail.com> [ Dump registers ABI specification. ] Signed-off-by: Jiri Olsa <jolsa@redhat.com> Suggested-by: Stephane Eranian <eranian@google.com> Cc: "Frank Ch. Eigler" <fche@redhat.com> Cc: Arun Sharma <asharma@fb.com> Cc: Benjamin Redelings <benjamin.redelings@nescent.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Frank Ch. Eigler <fche@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Robert Richter <robert.richter@amd.com> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> Cc: Ulrich Drepper <drepper@gmail.com> Link: http://lkml.kernel.org/r/1344345647-11536-3-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/perf_event.h>
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#include <linux/bug.h>
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#include <linux/stddef.h>
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#include <asm/perf_regs.h>
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#include <asm/ptrace.h>
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#ifdef CONFIG_X86_32
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#define PERF_REG_X86_MAX PERF_REG_X86_32_MAX
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#else
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#define PERF_REG_X86_MAX PERF_REG_X86_64_MAX
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#endif
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#define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r)
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static unsigned int pt_regs_offset[PERF_REG_X86_MAX] = {
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PT_REGS_OFFSET(PERF_REG_X86_AX, ax),
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PT_REGS_OFFSET(PERF_REG_X86_BX, bx),
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PT_REGS_OFFSET(PERF_REG_X86_CX, cx),
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PT_REGS_OFFSET(PERF_REG_X86_DX, dx),
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PT_REGS_OFFSET(PERF_REG_X86_SI, si),
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PT_REGS_OFFSET(PERF_REG_X86_DI, di),
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PT_REGS_OFFSET(PERF_REG_X86_BP, bp),
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PT_REGS_OFFSET(PERF_REG_X86_SP, sp),
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PT_REGS_OFFSET(PERF_REG_X86_IP, ip),
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PT_REGS_OFFSET(PERF_REG_X86_FLAGS, flags),
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PT_REGS_OFFSET(PERF_REG_X86_CS, cs),
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PT_REGS_OFFSET(PERF_REG_X86_SS, ss),
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#ifdef CONFIG_X86_32
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PT_REGS_OFFSET(PERF_REG_X86_DS, ds),
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PT_REGS_OFFSET(PERF_REG_X86_ES, es),
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PT_REGS_OFFSET(PERF_REG_X86_FS, fs),
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PT_REGS_OFFSET(PERF_REG_X86_GS, gs),
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#else
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/*
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* The pt_regs struct does not store
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* ds, es, fs, gs in 64 bit mode.
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*/
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(unsigned int) -1,
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(unsigned int) -1,
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(unsigned int) -1,
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(unsigned int) -1,
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#endif
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#ifdef CONFIG_X86_64
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PT_REGS_OFFSET(PERF_REG_X86_R8, r8),
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PT_REGS_OFFSET(PERF_REG_X86_R9, r9),
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PT_REGS_OFFSET(PERF_REG_X86_R10, r10),
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PT_REGS_OFFSET(PERF_REG_X86_R11, r11),
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PT_REGS_OFFSET(PERF_REG_X86_R12, r12),
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PT_REGS_OFFSET(PERF_REG_X86_R13, r13),
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PT_REGS_OFFSET(PERF_REG_X86_R14, r14),
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PT_REGS_OFFSET(PERF_REG_X86_R15, r15),
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#endif
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};
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u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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if (WARN_ON_ONCE(idx > ARRAY_SIZE(pt_regs_offset)))
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return 0;
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return regs_get_register(regs, pt_regs_offset[idx]);
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}
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#define REG_RESERVED (~((1ULL << PERF_REG_X86_MAX) - 1ULL))
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#ifdef CONFIG_X86_32
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int perf_reg_validate(u64 mask)
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{
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if (!mask || mask & REG_RESERVED)
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_abi(struct task_struct *task)
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{
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return PERF_SAMPLE_REGS_ABI_32;
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}
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#else /* CONFIG_X86_64 */
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#define REG_NOSUPPORT ((1ULL << PERF_REG_X86_DS) | \
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(1ULL << PERF_REG_X86_ES) | \
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(1ULL << PERF_REG_X86_FS) | \
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(1ULL << PERF_REG_X86_GS))
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int perf_reg_validate(u64 mask)
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{
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if (!mask || mask & REG_RESERVED)
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return -EINVAL;
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if (mask & REG_NOSUPPORT)
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return -EINVAL;
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return 0;
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}
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u64 perf_reg_abi(struct task_struct *task)
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{
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if (test_tsk_thread_flag(task, TIF_IA32))
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return PERF_SAMPLE_REGS_ABI_32;
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else
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return PERF_SAMPLE_REGS_ABI_64;
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}
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#endif /* CONFIG_X86_32 */
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