arch/powerpc/perf/perf_regs.c

   1 /*
   2  * Copyright 2016 Anju T, IBM Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/errno.h>
  11 #include <linux/kernel.h>
  12 #include <linux/sched.h>
  13 #include <linux/sched/task_stack.h>
  14 #include <linux/perf_event.h>
  15 #include <linux/bug.h>
  16 #include <linux/stddef.h>
  17 #include <asm/ptrace.h>
  18 #include <asm/perf_regs.h>
  19
  20 #define PT_REGS_OFFSET(id, r) [id] = offsetof(struct pt_regs, r)
  21
  22 #define REG_RESERVED (~((1ULL << PERF_REG_POWERPC_MAX) - 1))
  23
  24 static unsigned int pt_regs_offset[PERF_REG_POWERPC_MAX] = {
  25         PT_REGS_OFFSET(PERF_REG_POWERPC_R0,  gpr[0]),
  26         PT_REGS_OFFSET(PERF_REG_POWERPC_R1,  gpr[1]),
  27         PT_REGS_OFFSET(PERF_REG_POWERPC_R2,  gpr[2]),
  28         PT_REGS_OFFSET(PERF_REG_POWERPC_R3,  gpr[3]),
  29         PT_REGS_OFFSET(PERF_REG_POWERPC_R4,  gpr[4]),
  30         PT_REGS_OFFSET(PERF_REG_POWERPC_R5,  gpr[5]),
  31         PT_REGS_OFFSET(PERF_REG_POWERPC_R6,  gpr[6]),
  32         PT_REGS_OFFSET(PERF_REG_POWERPC_R7,  gpr[7]),
  33         PT_REGS_OFFSET(PERF_REG_POWERPC_R8,  gpr[8]),
  34         PT_REGS_OFFSET(PERF_REG_POWERPC_R9,  gpr[9]),
  35         PT_REGS_OFFSET(PERF_REG_POWERPC_R10, gpr[10]),
  36         PT_REGS_OFFSET(PERF_REG_POWERPC_R11, gpr[11]),
  37         PT_REGS_OFFSET(PERF_REG_POWERPC_R12, gpr[12]),
  38         PT_REGS_OFFSET(PERF_REG_POWERPC_R13, gpr[13]),
  39         PT_REGS_OFFSET(PERF_REG_POWERPC_R14, gpr[14]),
  40         PT_REGS_OFFSET(PERF_REG_POWERPC_R15, gpr[15]),
  41         PT_REGS_OFFSET(PERF_REG_POWERPC_R16, gpr[16]),
  42         PT_REGS_OFFSET(PERF_REG_POWERPC_R17, gpr[17]),
  43         PT_REGS_OFFSET(PERF_REG_POWERPC_R18, gpr[18]),
  44         PT_REGS_OFFSET(PERF_REG_POWERPC_R19, gpr[19]),
  45         PT_REGS_OFFSET(PERF_REG_POWERPC_R20, gpr[20]),
  46         PT_REGS_OFFSET(PERF_REG_POWERPC_R21, gpr[21]),
  47         PT_REGS_OFFSET(PERF_REG_POWERPC_R22, gpr[22]),
  48         PT_REGS_OFFSET(PERF_REG_POWERPC_R23, gpr[23]),
  49         PT_REGS_OFFSET(PERF_REG_POWERPC_R24, gpr[24]),
  50         PT_REGS_OFFSET(PERF_REG_POWERPC_R25, gpr[25]),
  51         PT_REGS_OFFSET(PERF_REG_POWERPC_R26, gpr[26]),
  52         PT_REGS_OFFSET(PERF_REG_POWERPC_R27, gpr[27]),
  53         PT_REGS_OFFSET(PERF_REG_POWERPC_R28, gpr[28]),
  54         PT_REGS_OFFSET(PERF_REG_POWERPC_R29, gpr[29]),
  55         PT_REGS_OFFSET(PERF_REG_POWERPC_R30, gpr[30]),
  56         PT_REGS_OFFSET(PERF_REG_POWERPC_R31, gpr[31]),
  57         PT_REGS_OFFSET(PERF_REG_POWERPC_NIP, nip),
  58         PT_REGS_OFFSET(PERF_REG_POWERPC_MSR, msr),
  59         PT_REGS_OFFSET(PERF_REG_POWERPC_ORIG_R3, orig_gpr3),
  60         PT_REGS_OFFSET(PERF_REG_POWERPC_CTR, ctr),
  61         PT_REGS_OFFSET(PERF_REG_POWERPC_LINK, link),
  62         PT_REGS_OFFSET(PERF_REG_POWERPC_XER, xer),
  63         PT_REGS_OFFSET(PERF_REG_POWERPC_CCR, ccr),
  64 #ifdef CONFIG_PPC64
  65         PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, softe),
  66 #else
  67         PT_REGS_OFFSET(PERF_REG_POWERPC_SOFTE, mq),
  68 #endif
  69         PT_REGS_OFFSET(PERF_REG_POWERPC_TRAP, trap),
  70         PT_REGS_OFFSET(PERF_REG_POWERPC_DAR, dar),
  71         PT_REGS_OFFSET(PERF_REG_POWERPC_DSISR, dsisr),
  72 };
  73
  74 u64 perf_reg_value(struct pt_regs *regs, int idx)
  75 {
  76         if (WARN_ON_ONCE(idx >= PERF_REG_POWERPC_MAX))
  77                 return 0;
  78
  79         return regs_get_register(regs, pt_regs_offset[idx]);
  80 }
  81
  82 int perf_reg_validate(u64 mask)
  83 {
  84         if (!mask || mask & REG_RESERVED)
  85                 return -EINVAL;
  86         return 0;
  87 }
  88
  89 u64 perf_reg_abi(struct task_struct *task)
  90 {
  91 #ifdef CONFIG_PPC64
  92         if (!test_tsk_thread_flag(task, TIF_32BIT))
  93                 return PERF_SAMPLE_REGS_ABI_64;
  94         else
  95 #endif
  96         return PERF_SAMPLE_REGS_ABI_32;
  97 }
  98
  99 void perf_get_regs_user(struct perf_regs *regs_user,
 100                         struct pt_regs *regs,
 101                         struct pt_regs *regs_user_copy)
 102 {
 103         regs_user->regs = task_pt_regs(current);
 104         regs_user->abi = (regs_user->regs) ? perf_reg_abi(current) :
 105                          PERF_SAMPLE_REGS_ABI_NONE;
 106 }