GNU Linux-libre 4.14.290-gnu1
[releases.git] / tools / perf / arch / powerpc / util / unwind-libdw.c
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 /* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils.  */
8 static const int special_regs[3][2] = {
9         { 65, PERF_REG_POWERPC_LINK },
10         { 101, PERF_REG_POWERPC_XER },
11         { 109, PERF_REG_POWERPC_CTR },
12 };
13
14 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)
15 {
16         struct unwind_info *ui = arg;
17         struct regs_dump *user_regs = &ui->sample->user_regs;
18         Dwarf_Word dwarf_regs[32], dwarf_nip;
19         size_t i;
20
21 #define REG(r) ({                                               \
22         Dwarf_Word val = 0;                                     \
23         perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r);  \
24         val;                                                    \
25 })
26
27         dwarf_regs[0]  = REG(R0);
28         dwarf_regs[1]  = REG(R1);
29         dwarf_regs[2]  = REG(R2);
30         dwarf_regs[3]  = REG(R3);
31         dwarf_regs[4]  = REG(R4);
32         dwarf_regs[5]  = REG(R5);
33         dwarf_regs[6]  = REG(R6);
34         dwarf_regs[7]  = REG(R7);
35         dwarf_regs[8]  = REG(R8);
36         dwarf_regs[9]  = REG(R9);
37         dwarf_regs[10] = REG(R10);
38         dwarf_regs[11] = REG(R11);
39         dwarf_regs[12] = REG(R12);
40         dwarf_regs[13] = REG(R13);
41         dwarf_regs[14] = REG(R14);
42         dwarf_regs[15] = REG(R15);
43         dwarf_regs[16] = REG(R16);
44         dwarf_regs[17] = REG(R17);
45         dwarf_regs[18] = REG(R18);
46         dwarf_regs[19] = REG(R19);
47         dwarf_regs[20] = REG(R20);
48         dwarf_regs[21] = REG(R21);
49         dwarf_regs[22] = REG(R22);
50         dwarf_regs[23] = REG(R23);
51         dwarf_regs[24] = REG(R24);
52         dwarf_regs[25] = REG(R25);
53         dwarf_regs[26] = REG(R26);
54         dwarf_regs[27] = REG(R27);
55         dwarf_regs[28] = REG(R28);
56         dwarf_regs[29] = REG(R29);
57         dwarf_regs[30] = REG(R30);
58         dwarf_regs[31] = REG(R31);
59         if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))
60                 return false;
61
62         dwarf_nip = REG(NIP);
63         dwfl_thread_state_register_pc(thread, dwarf_nip);
64         for (i = 0; i < ARRAY_SIZE(special_regs); i++) {
65                 Dwarf_Word val = 0;
66                 perf_reg_value(&val, user_regs, special_regs[i][1]);
67                 if (!dwfl_thread_state_registers(thread,
68                                                  special_regs[i][0], 1,
69                                                  &val))
70                         return false;
71         }
72
73         return true;
74 }