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 
libdw__arch_set_initial_registers(Dwfl_Thread * thread,void * arg)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[PERF_REG_ARM64_MAX], dwarf_pc;
12 
13 #define REG(r) ({						\
14 	Dwarf_Word val = 0;					\
15 	perf_reg_value(&val, user_regs, PERF_REG_ARM64_##r);	\
16 	val;							\
17 })
18 
19 	dwarf_regs[0]  = REG(X0);
20 	dwarf_regs[1]  = REG(X1);
21 	dwarf_regs[2]  = REG(X2);
22 	dwarf_regs[3]  = REG(X3);
23 	dwarf_regs[4]  = REG(X4);
24 	dwarf_regs[5]  = REG(X5);
25 	dwarf_regs[6]  = REG(X6);
26 	dwarf_regs[7]  = REG(X7);
27 	dwarf_regs[8]  = REG(X8);
28 	dwarf_regs[9]  = REG(X9);
29 	dwarf_regs[10] = REG(X10);
30 	dwarf_regs[11] = REG(X11);
31 	dwarf_regs[12] = REG(X12);
32 	dwarf_regs[13] = REG(X13);
33 	dwarf_regs[14] = REG(X14);
34 	dwarf_regs[15] = REG(X15);
35 	dwarf_regs[16] = REG(X16);
36 	dwarf_regs[17] = REG(X17);
37 	dwarf_regs[18] = REG(X18);
38 	dwarf_regs[19] = REG(X19);
39 	dwarf_regs[20] = REG(X20);
40 	dwarf_regs[21] = REG(X21);
41 	dwarf_regs[22] = REG(X22);
42 	dwarf_regs[23] = REG(X23);
43 	dwarf_regs[24] = REG(X24);
44 	dwarf_regs[25] = REG(X25);
45 	dwarf_regs[26] = REG(X26);
46 	dwarf_regs[27] = REG(X27);
47 	dwarf_regs[28] = REG(X28);
48 	dwarf_regs[29] = REG(X29);
49 	dwarf_regs[30] = REG(LR);
50 	dwarf_regs[31] = REG(SP);
51 
52 	if (!dwfl_thread_state_registers(thread, 0, PERF_REG_ARM64_MAX,
53 					 dwarf_regs))
54 		return false;
55 
56 	dwarf_pc = REG(PC);
57 	dwfl_thread_state_register_pc(thread, dwarf_pc);
58 
59 	return true;
60 }
61