55 lines · c
1// SPDX-License-Identifier: GPL-2.02#include <elfutils/libdwfl.h>3#include "perf_regs.h"4#include "../../../util/unwind-libdw.h"5#include "../../../util/perf_regs.h"6#include "util/sample.h"7 8bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)9{10 struct unwind_info *ui = arg;11 struct regs_dump *user_regs = &ui->sample->user_regs;12 Dwarf_Word dwarf_regs[17];13 unsigned nregs;14 15#define REG(r) ({ \16 Dwarf_Word val = 0; \17 perf_reg_value(&val, user_regs, PERF_REG_X86_##r); \18 val; \19})20 21 if (user_regs->abi == PERF_SAMPLE_REGS_ABI_32) {22 dwarf_regs[0] = REG(AX);23 dwarf_regs[1] = REG(CX);24 dwarf_regs[2] = REG(DX);25 dwarf_regs[3] = REG(BX);26 dwarf_regs[4] = REG(SP);27 dwarf_regs[5] = REG(BP);28 dwarf_regs[6] = REG(SI);29 dwarf_regs[7] = REG(DI);30 dwarf_regs[8] = REG(IP);31 nregs = 9;32 } else {33 dwarf_regs[0] = REG(AX);34 dwarf_regs[1] = REG(DX);35 dwarf_regs[2] = REG(CX);36 dwarf_regs[3] = REG(BX);37 dwarf_regs[4] = REG(SI);38 dwarf_regs[5] = REG(DI);39 dwarf_regs[6] = REG(BP);40 dwarf_regs[7] = REG(SP);41 dwarf_regs[8] = REG(R8);42 dwarf_regs[9] = REG(R9);43 dwarf_regs[10] = REG(R10);44 dwarf_regs[11] = REG(R11);45 dwarf_regs[12] = REG(R12);46 dwarf_regs[13] = REG(R13);47 dwarf_regs[14] = REG(R14);48 dwarf_regs[15] = REG(R15);49 dwarf_regs[16] = REG(IP);50 nregs = 17;51 }52 53 return dwfl_thread_state_registers(thread, 0, nregs, dwarf_regs);54}55