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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 
 11 u64 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 
 39 int perf_reg_validate(u64 mask)
 40 {
 41         if (!mask || mask & REG_RESERVED)
 42                 return -EINVAL;
 43 
 44         return 0;
 45 }
 46 
 47 u64 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 
 55 void perf_get_regs_user(struct perf_regs *regs_user,
 56                         struct pt_regs *regs,
 57                         struct pt_regs *regs_user_copy)
 58 {
 59         /*
 60          * Use the regs from the first interruption and let
 61          * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
 62          *
 63          * Also save FPU registers for user-space tasks only.
 64          */
 65         regs_user->regs = task_pt_regs(current);
 66         if (user_mode(regs_user->regs))
 67                 save_fpu_regs();
 68         regs_user->abi = perf_reg_abi(current);
 69 }
 70 

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