forked from Minki/linux
49863894db
This patch implements the functions required for the perf registers API, allowing the perf tool to interface kernel register dumps with libunwind in order to provide userspace backtracing. Cc: Jean Pihet <jean.pihet@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
31 lines
540 B
C
31 lines
540 B
C
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/perf_event.h>
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#include <linux/bug.h>
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#include <asm/perf_regs.h>
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#include <asm/ptrace.h>
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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((u32)idx >= PERF_REG_ARM_MAX))
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return 0;
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return regs->uregs[idx];
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}
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#define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
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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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