arch/riscv/kernel/perf_regs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */
   3
   4 #include <linux/errno.h>
   5 #include <linux/kernel.h>
   6 #include <linux/perf_event.h>
   7 #include <linux/bug.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_RISCV_MAX))
  14                 return 0;
  15
  16         return ((unsigned long *)regs)[idx];
  17 }
  18
  19 #define REG_RESERVED (~((1ULL << PERF_REG_RISCV_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 #if __riscv_xlen == 64
  32         return PERF_SAMPLE_REGS_ABI_64;
  33 #else
  34         return PERF_SAMPLE_REGS_ABI_32;
  35 #endif
  36 }
  37
  38 void perf_get_regs_user(struct perf_regs *regs_user,
  39                         struct pt_regs *regs,
  40                         struct pt_regs *regs_user_copy)
  41 {
  42         regs_user->regs = task_pt_regs(current);
  43         regs_user->abi = perf_reg_abi(current);
  44 }