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[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