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88a7c26af8
On x86_64, at least, task_pt_regs may be only partially initialized in many contexts, so x86_64 should not use it without extra care from interrupt context, let alone NMI context. This will allow x86_64 to override the logic and will supply some scratch space to use to make a cleaner copy of user regs. Tested-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: chenggang.qcg@taobao.com Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Namhyung Kim <namhyung@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Jean Pihet <jean.pihet@linaro.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mark Salter <msalter@redhat.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/e431cd4c18c2e1c44c774f10758527fb2d1025c4.1420396372.git.luto@amacapital.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
121 lines
2.9 KiB
C
121 lines
2.9 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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void perf_get_regs_user(struct perf_regs *regs_user,
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struct pt_regs *regs,
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struct pt_regs *regs_user_copy)
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{
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regs_user->regs = task_pt_regs(current);
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regs_user->abi = perf_reg_abi(current);
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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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void perf_get_regs_user(struct perf_regs *regs_user,
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struct pt_regs *regs,
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struct pt_regs *regs_user_copy)
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{
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regs_user->regs = task_pt_regs(current);
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regs_user->abi = perf_reg_abi(current);
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}
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#endif /* CONFIG_X86_32 */
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