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