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Linux/arch/arm/kernel/perf_regs.c

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  1 
  2 #include <linux/errno.h>
  3 #include <linux/kernel.h>
  4 #include <linux/perf_event.h>
  5 #include <linux/bug.h>
  6 #include <asm/perf_regs.h>
  7 #include <asm/ptrace.h>
  8 
  9 u64 perf_reg_value(struct pt_regs *regs, int idx)
 10 {
 11         if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM_MAX))
 12                 return 0;
 13 
 14         return regs->uregs[idx];
 15 }
 16 
 17 #define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
 18 
 19 int perf_reg_validate(u64 mask)
 20 {
 21         if (!mask || mask & REG_RESERVED)
 22                 return -EINVAL;
 23 
 24         return 0;
 25 }
 26 
 27 u64 perf_reg_abi(struct task_struct *task)
 28 {
 29         return PERF_SAMPLE_REGS_ABI_32;
 30 }
 31 
 32 void perf_get_regs_user(struct perf_regs *regs_user,
 33                         struct pt_regs *regs,
 34                         struct pt_regs *regs_user_copy)
 35 {
 36         regs_user->regs = task_pt_regs(current);
 37         regs_user->abi = perf_reg_abi(current);
 38 }
 39 

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