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| author | Will Deacon <will.deacon@arm.com> | 2014-08-22 17:25:21 +0400 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2014-08-28 23:01:50 +0400 |
| commit | 5b75a6af11357813a7eeb4a29d0261adbbfab556 (patch) | |
| tree | f9b1c90258e8e5bf43308ee76eb123860e313225 | |
| parent | 85487edd252fa04718dcd735bc0f41213bbb9546 (diff) | |
| download | linux-5b75a6af11357813a7eeb4a29d0261adbbfab556.tar.xz | |
arm64: perf: don't rely on layout of pt_regs when grabbing sp or pc
The current perf_regs code relies on sp and pc sitting just off the end
of the pt_regs->regs array. This is ugly and fragile, so this patch
checks for these register explicitly and returns the appropriate field.
Acked-by: Jean Pihet <jean.pihet@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | arch/arm64/kernel/perf_regs.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/arm64/kernel/perf_regs.c b/arch/arm64/kernel/perf_regs.c index 422ebd63b619..6762ad705587 100644 --- a/arch/arm64/kernel/perf_regs.c +++ b/arch/arm64/kernel/perf_regs.c @@ -24,6 +24,12 @@ u64 perf_reg_value(struct pt_regs *regs, int idx) return regs->compat_lr; } + if ((u32)idx == PERF_REG_ARM64_SP) + return regs->sp; + + if ((u32)idx == PERF_REG_ARM64_PC) + return regs->pc; + return regs->regs[idx]; } |