1// SPDX-License-Identifier: GPL-2.0
2#include <elfutils/libdwfl.h>
3#include <linux/kernel.h>
4#include "perf_regs.h"
5#include "../../../util/unwind-libdw.h"
6#include "../../../util/perf_regs.h"
7#include "../../../util/sample.h"
8
9/* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils.  */
10static const int special_regs[3][2] = {
11	{ 65, PERF_REG_POWERPC_LINK },
12	{ 101, PERF_REG_POWERPC_XER },
13	{ 109, PERF_REG_POWERPC_CTR },
14};
15
16bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
17{
18	struct unwind_info *ui = arg;
19	struct regs_dump *user_regs = &ui->sample->user_regs;
20	Dwarf_Word dwarf_regs[32], dwarf_nip;
21	size_t i;
22
23#define REG(r) ({						\
24	Dwarf_Word val = 0;					\
25	perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r);	\
26	val;							\
27})
28
29	dwarf_regs[0]  = REG(R0);
30	dwarf_regs[1]  = REG(R1);
31	dwarf_regs[2]  = REG(R2);
32	dwarf_regs[3]  = REG(R3);
33	dwarf_regs[4]  = REG(R4);
34	dwarf_regs[5]  = REG(R5);
35	dwarf_regs[6]  = REG(R6);
36	dwarf_regs[7]  = REG(R7);
37	dwarf_regs[8]  = REG(R8);
38	dwarf_regs[9]  = REG(R9);
39	dwarf_regs[10] = REG(R10);
40	dwarf_regs[11] = REG(R11);
41	dwarf_regs[12] = REG(R12);
42	dwarf_regs[13] = REG(R13);
43	dwarf_regs[14] = REG(R14);
44	dwarf_regs[15] = REG(R15);
45	dwarf_regs[16] = REG(R16);
46	dwarf_regs[17] = REG(R17);
47	dwarf_regs[18] = REG(R18);
48	dwarf_regs[19] = REG(R19);
49	dwarf_regs[20] = REG(R20);
50	dwarf_regs[21] = REG(R21);
51	dwarf_regs[22] = REG(R22);
52	dwarf_regs[23] = REG(R23);
53	dwarf_regs[24] = REG(R24);
54	dwarf_regs[25] = REG(R25);
55	dwarf_regs[26] = REG(R26);
56	dwarf_regs[27] = REG(R27);
57	dwarf_regs[28] = REG(R28);
58	dwarf_regs[29] = REG(R29);
59	dwarf_regs[30] = REG(R30);
60	dwarf_regs[31] = REG(R31);
61	if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))
62		return false;
63
64	dwarf_nip = REG(NIP);
65	dwfl_thread_state_register_pc(thread, dwarf_nip);
66	for (i = 0; i < ARRAY_SIZE(special_regs); i++) {
67		Dwarf_Word val = 0;
68		perf_reg_value(&val, user_regs, special_regs[i][1]);
69		if (!dwfl_thread_state_registers(thread,
70						 special_regs[i][0], 1,
71						 &val))
72			return false;
73	}
74
75	return true;
76}
77