1// SPDX-License-Identifier: GPL-2.0
2#include <elfutils/libdwfl.h>
3#include "perf_regs.h"
4#include "../../../util/unwind-libdw.h"
5#include "../../../util/perf_regs.h"
6#include "util/sample.h"
7
8bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
9{
10 struct unwind_info *ui = arg;
11 struct regs_dump *user_regs = perf_sample__user_regs(ui->sample);
12 Dwarf_Word dwarf_regs[17];
13 unsigned nregs;
14
15#define REG(r) ({ \
16 Dwarf_Word val = 0; \
17 perf_reg_value(&val, user_regs, PERF_REG_X86_##r); \
18 val; \
19})
20
21 if (user_regs->abi == PERF_SAMPLE_REGS_ABI_32) {
22 dwarf_regs[0] = REG(AX);
23 dwarf_regs[1] = REG(CX);
24 dwarf_regs[2] = REG(DX);
25 dwarf_regs[3] = REG(BX);
26 dwarf_regs[4] = REG(SP);
27 dwarf_regs[5] = REG(BP);
28 dwarf_regs[6] = REG(SI);
29 dwarf_regs[7] = REG(DI);
30 dwarf_regs[8] = REG(IP);
31 nregs = 9;
32 } else {
33 dwarf_regs[0] = REG(AX);
34 dwarf_regs[1] = REG(DX);
35 dwarf_regs[2] = REG(CX);
36 dwarf_regs[3] = REG(BX);
37 dwarf_regs[4] = REG(SI);
38 dwarf_regs[5] = REG(DI);
39 dwarf_regs[6] = REG(BP);
40 dwarf_regs[7] = REG(SP);
41 dwarf_regs[8] = REG(R8);
42 dwarf_regs[9] = REG(R9);
43 dwarf_regs[10] = REG(R10);
44 dwarf_regs[11] = REG(R11);
45 dwarf_regs[12] = REG(R12);
46 dwarf_regs[13] = REG(R13);
47 dwarf_regs[14] = REG(R14);
48 dwarf_regs[15] = REG(R15);
49 dwarf_regs[16] = REG(IP);
50 nregs = 17;
51 }
52
53 return dwfl_thread_state_registers(thread, 0, nregs, dwarf_regs);
54}
55

source code of linux/tools/perf/arch/x86/util/unwind-libdw.c