// SPDX-License-Identifier: GPL-2.0 #include <elfutils/libdwfl.h> #include <linux/kernel.h> #include "../../util/unwind-libdw.h" #include "../../util/perf_regs.h" #include "../../util/event.h" /* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils. */ static const int special_regs[3][2] = { { 65, PERF_REG_POWERPC_LINK }, { 101, PERF_REG_POWERPC_XER }, { 109, PERF_REG_POWERPC_CTR }, }; bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg) { struct unwind_info *ui = arg; struct regs_dump *user_regs = &ui->sample->user_regs; Dwarf_Word dwarf_regs[32], dwarf_nip; size_t i; #define REG(r) ({ \ Dwarf_Word val = 0; \ perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r); \ val; \ }) dwarf_regs[0] = REG(R0); dwarf_regs[1] = REG(R1); dwarf_regs[2] = REG(R2); dwarf_regs[3] = REG(R3); dwarf_regs[4] = REG(R4); dwarf_regs[5] = REG(R5); dwarf_regs[6] = REG(R6); dwarf_regs[7] = REG(R7); dwarf_regs[8] = REG(R8); dwarf_regs[9] = REG(R9); dwarf_regs[10] = REG(R10); dwarf_regs[11] = REG(R11); dwarf_regs[12] = REG(R12); dwarf_regs[13] = REG(R13); dwarf_regs[14] = REG(R14); dwarf_regs[15] = REG(R15); dwarf_regs[16] = REG(R16); dwarf_regs[17] = REG(R17); dwarf_regs[18] = REG(R18); dwarf_regs[19] = REG(R19); dwarf_regs[20] = REG(R20); dwarf_regs[21] = REG(R21); dwarf_regs[22] = REG(R22); dwarf_regs[23] = REG(R23); dwarf_regs[24] = REG(R24); dwarf_regs[25] = REG(R25); dwarf_regs[26] = REG(R26); dwarf_regs[27] = REG(R27); dwarf_regs[28] = REG(R28); dwarf_regs[29] = REG(R29); dwarf_regs[30] = REG(R30); dwarf_regs[31] = REG(R31); if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs)) return false; dwarf_nip = REG(NIP); dwfl_thread_state_register_pc(thread, dwarf_nip); for (i = 0; i < ARRAY_SIZE(special_regs); i++) { Dwarf_Word val = 0; perf_reg_value(&val, user_regs, special_regs[i][1]); if (!dwfl_thread_state_registers(thread, special_regs[i][0], 1, &val)) return false; } return true; }