arch/s390/kernel/perf_regs.c

   1 #include <linux/perf_event.h>
   2 #include <linux/perf_regs.h>
   3 #include <linux/kernel.h>
   4 #include <linux/errno.h>
   5 #include <linux/bug.h>
   6 #include <asm/ptrace.h>
   7 #include <asm/fpu/api.h>
   8 #include <asm/fpu/types.h>
   9
  10 u64 perf_reg_value(struct pt_regs *regs, int idx)
  11 {
  12         freg_t fp;
  13
  14         if (WARN_ON_ONCE((u32)idx >= PERF_REG_S390_MAX))
  15                 return 0;
  16
  17         if (idx >= PERF_REG_S390_R0 && idx <= PERF_REG_S390_R15)
  18                 return regs->gprs[idx];
  19
  20         if (idx >= PERF_REG_S390_FP0 && idx <= PERF_REG_S390_FP15) {
  21                 if (!user_mode(regs))
  22                         return 0;
  23
  24                 idx -= PERF_REG_S390_FP0;
  25                 fp = MACHINE_HAS_VX ? *(freg_t *)(current->thread.fpu.vxrs + idx)
  26                                     : current->thread.fpu.fprs[idx];
  27                 return fp.ui;
  28         }
  29
  30         if (idx == PERF_REG_S390_MASK)
  31                 return regs->psw.mask;
  32         if (idx == PERF_REG_S390_PC)
  33                 return regs->psw.addr;
  34
  35         return regs->gprs[idx];
  36 }
  37
  38 #define REG_RESERVED (~((1UL << PERF_REG_S390_MAX) - 1))
  39
  40 int perf_reg_validate(u64 mask)
  41 {
  42         if (!mask || mask & REG_RESERVED)
  43                 return -EINVAL;
  44
  45         return 0;
  46 }
  47
  48 u64 perf_reg_abi(struct task_struct *task)
  49 {
  50         if (test_tsk_thread_flag(task, TIF_31BIT))
  51                 return PERF_SAMPLE_REGS_ABI_32;
  52
  53         return PERF_SAMPLE_REGS_ABI_64;
  54 }
  55
  56 void perf_get_regs_user(struct perf_regs *regs_user,
  57                         struct pt_regs *regs,
  58                         struct pt_regs *regs_user_copy)
  59 {
  60         /*
  61          * Use the regs from the first interruption and let
  62          * perf_sample_regs_intr() handle interrupts (regs == get_irq_regs()).
  63          *
  64          * Also save FPU registers for user-space tasks only.
  65          */
  66         regs_user->regs = task_pt_regs(current);
  67         if (user_mode(regs_user->regs))
  68                 save_fpu_regs();
  69         regs_user->abi = perf_reg_abi(current);
  70 }