tools/perf/arch/powerpc/util/unwind-libdw.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <elfutils/libdwfl.h>
   3 #include <linux/kernel.h>
   4 #include "../../util/unwind-libdw.h"
   5 #include "../../util/perf_regs.h"
   6 #include "../../util/event.h"
   7
   8 /* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils.  */
   9 static const int special_regs[3][2] = {
  10         { 65, PERF_REG_POWERPC_LINK },
  11         { 101, PERF_REG_POWERPC_XER },
  12         { 109, PERF_REG_POWERPC_CTR },
  13 };
  14
  15 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
  16 {
  17         struct unwind_info *ui = arg;
  18         struct regs_dump *user_regs = &ui->sample->user_regs;
  19         Dwarf_Word dwarf_regs[32], dwarf_nip;
  20         size_t i;
  21
  22 #define REG(r) ({                                               \
  23         Dwarf_Word val = 0;                                     \
  24         perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r);  \
  25         val;                                                    \
  26 })
  27
  28         dwarf_regs[0]  = REG(R0);
  29         dwarf_regs[1]  = REG(R1);
  30         dwarf_regs[2]  = REG(R2);
  31         dwarf_regs[3]  = REG(R3);
  32         dwarf_regs[4]  = REG(R4);
  33         dwarf_regs[5]  = REG(R5);
  34         dwarf_regs[6]  = REG(R6);
  35         dwarf_regs[7]  = REG(R7);
  36         dwarf_regs[8]  = REG(R8);
  37         dwarf_regs[9]  = REG(R9);
  38         dwarf_regs[10] = REG(R10);
  39         dwarf_regs[11] = REG(R11);
  40         dwarf_regs[12] = REG(R12);
  41         dwarf_regs[13] = REG(R13);
  42         dwarf_regs[14] = REG(R14);
  43         dwarf_regs[15] = REG(R15);
  44         dwarf_regs[16] = REG(R16);
  45         dwarf_regs[17] = REG(R17);
  46         dwarf_regs[18] = REG(R18);
  47         dwarf_regs[19] = REG(R19);
  48         dwarf_regs[20] = REG(R20);
  49         dwarf_regs[21] = REG(R21);
  50         dwarf_regs[22] = REG(R22);
  51         dwarf_regs[23] = REG(R23);
  52         dwarf_regs[24] = REG(R24);
  53         dwarf_regs[25] = REG(R25);
  54         dwarf_regs[26] = REG(R26);
  55         dwarf_regs[27] = REG(R27);
  56         dwarf_regs[28] = REG(R28);
  57         dwarf_regs[29] = REG(R29);
  58         dwarf_regs[30] = REG(R30);
  59         dwarf_regs[31] = REG(R31);
  60         if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))
  61                 return false;
  62
  63         dwarf_nip = REG(NIP);
  64         dwfl_thread_state_register_pc(thread, dwarf_nip);
  65         for (i = 0; i < ARRAY_SIZE(special_regs); i++) {
  66                 Dwarf_Word val = 0;
  67                 perf_reg_value(&val, user_regs, special_regs[i][1]);
  68                 if (!dwfl_thread_state_registers(thread,
  69                                                  special_regs[i][0], 1,
  70                                                  &val))
  71                         return false;
  72         }
  73
  74         return true;
  75 }