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