5b75a6af11
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>
52 lines
1 KiB
C
52 lines
1 KiB
C
#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/compat.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_ARM64_MAX))
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return 0;
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/*
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* Compat (i.e. 32 bit) mode:
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* - PC has been set in the pt_regs struct in kernel_entry,
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* - Handle SP and LR here.
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*/
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if (compat_user_mode(regs)) {
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if ((u32)idx == PERF_REG_ARM64_SP)
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return regs->compat_sp;
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if ((u32)idx == PERF_REG_ARM64_LR)
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return regs->compat_lr;
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}
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if ((u32)idx == PERF_REG_ARM64_SP)
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return regs->sp;
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if ((u32)idx == PERF_REG_ARM64_PC)
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return regs->pc;
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return regs->regs[idx];
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}
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#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_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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if (is_compat_thread(task_thread_info(task)))
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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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