arch/arm/kernel/perf_regs.c

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