linux/arch/s390/kernel/perf_regs.c
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   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/perf_event.h>
   3#include <linux/perf_regs.h>
   4#include <linux/kernel.h>
   5#include <linux/errno.h>
   6#include <linux/bug.h>
   7#include <asm/ptrace.h>
   8#include <asm/fpu/api.h>
   9#include <asm/fpu/types.h>
  10
  11u64 perf_reg_value(struct pt_regs *regs, int idx)
  12{
  13        freg_t fp;
  14
  15        if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
  16                return regs->gprs[idx];
  17
  18        if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
  19                if (!user_mode(regs))
  20                        return 0;
  21
  22                idx -= PERF_REG_S390_FP0;
  23                fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx)
  24                                    : current->thread.fpu.fprs[idx];
  25                return fp.ui;
  26        }
  27
  28        if (idx == PERF_REG_S390_MASK)
  29                return regs->psw.mask;
  30        if (idx == PERF_REG_S390_PC)
  31                return regs->psw.addr;
  32
  33        WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX);
  34        return 0;
  35}
  36
  37#define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
  38
  39int perf_reg_validate(u64 mask)
  40{
  41        if (!mask || mask & REG_RESERVED)
  42                return -EINVAL;
  43
  44        return 0;
  45}
  46
  47u64 perf_reg_abi(struct task_struct *task)
  48{
  49        if (test_tsk_thread_flag(task, TIF_31BIT))
  50                return PERF_SAMPLE_REGS_ABI_32;
  51
  52        return PERF_SAMPLE_REGS_ABI_64;
  53}
  54
  55void perf_get_regs_user(struct perf_regs *regs_user,
  56                        struct pt_regs *regs)
  57{
  58        /*
  59         * Use the regs from the first interruption and let
  60         * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
  61         *
  62         * Also save FPU registers for user-space tasks only.
  63         */
  64        regs_user->regs = task_pt_regs(current);
  65        if (user_mode(regs_user->regs))
  66                save_fpu_regs();
  67        regs_user->abi = perf_reg_abi(current);
  68}
  69