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Andy Lutomirski
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 <[email protected]> Signed-off-by: Andy Lutomirski <[email protected]> Signed-off-by: Peter Zijlstra (Intel) <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: [email protected] Cc: Wu Fengguang <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Arjan van de Ven <[email protected]> Cc: David Ahern <[email protected]> Cc: Arnaldo Carvalho de Melo <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Jean Pihet <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Mark Salter <[email protected]> Cc: Russell King <[email protected]> Cc: Will Deacon <[email protected]> Cc: [email protected] Link: http://lkml.kernel.org/r/e431cd4c18c2e1c44c774f10758527fb2d1025c4.1420396372.git.luto@amacapital.net Signed-off-by: Ingo Molnar <[email protected]>
42 lines
969 B
C
42 lines
969 B
C
#ifndef _LINUX_PERF_REGS_H
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#define _LINUX_PERF_REGS_H
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struct perf_regs {
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__u64 abi;
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struct pt_regs *regs;
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};
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#ifdef CONFIG_HAVE_PERF_REGS
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#include <asm/perf_regs.h>
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u64 perf_reg_value(struct pt_regs *regs, int idx);
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int perf_reg_validate(u64 mask);
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u64 perf_reg_abi(struct task_struct *task);
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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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#else
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static inline u64 perf_reg_value(struct pt_regs *regs, int idx)
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{
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return 0;
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}
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static inline int perf_reg_validate(u64 mask)
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{
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return mask ? -ENOSYS : 0;
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}
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static inline u64 perf_reg_abi(struct task_struct *task)
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{
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return PERF_SAMPLE_REGS_ABI_NONE;
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}
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static inline 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_HAVE_PERF_REGS */
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#endif /* _LINUX_PERF_REGS_H */
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