LXR linux/arch/riscv/kernel/perf

   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
  11u64 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
  21int perf_reg_validate(u64 mask)
  22{
  23        if (!mask || mask & REG_RESERVED)
  24                return -EINVAL;
  25
  26        return 0;
  27}
  28
  29u64 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
  38void perf_get_regs_user(struct perf_regs *regs_user,
  39                        struct pt_regs *regs)
  40{
  41        regs_user->regs = task_pt_regs(current);
  42        regs_user->abi = perf_reg_abi(current);
  43}
  44