linux/tools/perf/arch/x86/util/unwind-libdw.c
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   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
   7bool 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[17];
  12        unsigned nregs;
  13
  14#define REG(r) ({                                               \
  15        Dwarf_Word val = 0;                                     \
  16        perf_reg_value(&val, user_regs, PERF_REG_X86_##r);      \
  17        val;                                                    \
  18})
  19
  20        if (user_regs->abi == PERF_SAMPLE_REGS_ABI_32) {
  21                dwarf_regs[0] = REG(AX);
  22                dwarf_regs[1] = REG(CX);
  23                dwarf_regs[2] = REG(DX);
  24                dwarf_regs[3] = REG(BX);
  25                dwarf_regs[4] = REG(SP);
  26                dwarf_regs[5] = REG(BP);
  27                dwarf_regs[6] = REG(SI);
  28                dwarf_regs[7] = REG(DI);
  29                dwarf_regs[8] = REG(IP);
  30                nregs = 9;
  31        } else {
  32                dwarf_regs[0]  = REG(AX);
  33                dwarf_regs[1]  = REG(DX);
  34                dwarf_regs[2]  = REG(CX);
  35                dwarf_regs[3]  = REG(BX);
  36                dwarf_regs[4]  = REG(SI);
  37                dwarf_regs[5]  = REG(DI);
  38                dwarf_regs[6]  = REG(BP);
  39                dwarf_regs[7]  = REG(SP);
  40                dwarf_regs[8]  = REG(R8);
  41                dwarf_regs[9]  = REG(R9);
  42                dwarf_regs[10] = REG(R10);
  43                dwarf_regs[11] = REG(R11);
  44                dwarf_regs[12] = REG(R12);
  45                dwarf_regs[13] = REG(R13);
  46                dwarf_regs[14] = REG(R14);
  47                dwarf_regs[15] = REG(R15);
  48                dwarf_regs[16] = REG(IP);
  49                nregs = 17;
  50        }
  51
  52        return dwfl_thread_state_registers(thread, 0, nregs, dwarf_regs);
  53}
  54