arch/arm/kernel/perf_regs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/errno.h>
   4 #include <linux/kernel.h>
   5 #include <linux/perf_event.h>
   6 #include <linux/bug.h>
   7 #include <linux/sched/task_stack.h>
   8 #include <asm/perf_regs.h>
   9 #include <asm/ptrace.h>
  10
  11 u64 perf_reg_value(struct pt_regs *regs, int idx)
  12 {
  13         if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM_MAX))
  14                 return 0;
  15
  16         return regs->uregs[idx];
  17 }
  18
  19 #define REG_RESERVED (~((1ULL << PERF_REG_ARM_MAX) - 1))
  20
  21 int perf_reg_validate(u64 mask)
  22 {
  23         if (!mask || mask & REG_RESERVED)
  24                 return -EINVAL;
  25
  26         return 0;
  27 }
  28
  29 u64 perf_reg_abi(struct task_struct *task)
  30 {
  31         return PERF_SAMPLE_REGS_ABI_32;
  32 }
  33
  34 void perf_get_regs_user(struct perf_regs *regs_user,
  35                         struct pt_regs *regs)
  36 {
  37         regs_user->regs = task_pt_regs(current);
  38         regs_user->abi = perf_reg_abi(current);
  39 }