root/tools/perf/arch/arm64/util/unwind-libdw.c

DEFINITIONS

1. libdw__arch_set_initial_registers

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <elfutils/libdwfl.h>
   3 #include "../../util/unwind-libdw.h"
   4 #include "../../util/perf_regs.h"
   5 #include "../../util/event.h"
   6 
   7 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
   8 {
   9         struct unwind_info *ui = arg;
  10         struct regs_dump *user_regs = &ui->sample->user_regs;
  11         Dwarf_Word dwarf_regs[PERF_REG_ARM64_MAX], dwarf_pc;
  12 
  13 #define REG(r) ({                                               \
  14         Dwarf_Word val = 0;                                     \
  15         perf_reg_value(&val, user_regs, PERF_REG_ARM64_##r);    \
  16         val;                                                    \
  17 })
  18 
  19         dwarf_regs[0]  = REG(X0);
  20         dwarf_regs[1]  = REG(X1);
  21         dwarf_regs[2]  = REG(X2);
  22         dwarf_regs[3]  = REG(X3);
  23         dwarf_regs[4]  = REG(X4);
  24         dwarf_regs[5]  = REG(X5);
  25         dwarf_regs[6]  = REG(X6);
  26         dwarf_regs[7]  = REG(X7);
  27         dwarf_regs[8]  = REG(X8);
  28         dwarf_regs[9]  = REG(X9);
  29         dwarf_regs[10] = REG(X10);
  30         dwarf_regs[11] = REG(X11);
  31         dwarf_regs[12] = REG(X12);
  32         dwarf_regs[13] = REG(X13);
  33         dwarf_regs[14] = REG(X14);
  34         dwarf_regs[15] = REG(X15);
  35         dwarf_regs[16] = REG(X16);
  36         dwarf_regs[17] = REG(X17);
  37         dwarf_regs[18] = REG(X18);
  38         dwarf_regs[19] = REG(X19);
  39         dwarf_regs[20] = REG(X20);
  40         dwarf_regs[21] = REG(X21);
  41         dwarf_regs[22] = REG(X22);
  42         dwarf_regs[23] = REG(X23);
  43         dwarf_regs[24] = REG(X24);
  44         dwarf_regs[25] = REG(X25);
  45         dwarf_regs[26] = REG(X26);
  46         dwarf_regs[27] = REG(X27);
  47         dwarf_regs[28] = REG(X28);
  48         dwarf_regs[29] = REG(X29);
  49         dwarf_regs[30] = REG(LR);
  50         dwarf_regs[31] = REG(SP);
  51 
  52         if (!dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX,
  53                                          dwarf_regs))
  54                 return false;
  55 
  56         dwarf_pc = REG(PC);
  57         dwfl_thread_state_register_pc(thread, dwarf_pc);
  58 
  59         return true;
  60 }