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1// SPDX-License-Identifier: GPL-2.02#include <elfutils/libdwfl.h>3#include <linux/kernel.h>4#include "perf_regs.h"5#include "../../../util/unwind-libdw.h"6#include "../../../util/perf_regs.h"7#include "../../../util/sample.h"8 9/* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils. */10static const int special_regs[3][2] = {11 { 65, PERF_REG_POWERPC_LINK },12 { 101, PERF_REG_POWERPC_XER },13 { 109, PERF_REG_POWERPC_CTR },14};15 16bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg)17{18 struct unwind_info *ui = arg;19 struct regs_dump *user_regs = &ui->sample->user_regs;20 Dwarf_Word dwarf_regs[32], dwarf_nip;21 size_t i;22 23#define REG(r) ({ \24 Dwarf_Word val = 0; \25 perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r); \26 val; \27})28 29 dwarf_regs[0] = REG(R0);30 dwarf_regs[1] = REG(R1);31 dwarf_regs[2] = REG(R2);32 dwarf_regs[3] = REG(R3);33 dwarf_regs[4] = REG(R4);34 dwarf_regs[5] = REG(R5);35 dwarf_regs[6] = REG(R6);36 dwarf_regs[7] = REG(R7);37 dwarf_regs[8] = REG(R8);38 dwarf_regs[9] = REG(R9);39 dwarf_regs[10] = REG(R10);40 dwarf_regs[11] = REG(R11);41 dwarf_regs[12] = REG(R12);42 dwarf_regs[13] = REG(R13);43 dwarf_regs[14] = REG(R14);44 dwarf_regs[15] = REG(R15);45 dwarf_regs[16] = REG(R16);46 dwarf_regs[17] = REG(R17);47 dwarf_regs[18] = REG(R18);48 dwarf_regs[19] = REG(R19);49 dwarf_regs[20] = REG(R20);50 dwarf_regs[21] = REG(R21);51 dwarf_regs[22] = REG(R22);52 dwarf_regs[23] = REG(R23);53 dwarf_regs[24] = REG(R24);54 dwarf_regs[25] = REG(R25);55 dwarf_regs[26] = REG(R26);56 dwarf_regs[27] = REG(R27);57 dwarf_regs[28] = REG(R28);58 dwarf_regs[29] = REG(R29);59 dwarf_regs[30] = REG(R30);60 dwarf_regs[31] = REG(R31);61 if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs))62 return false;63 64 dwarf_nip = REG(NIP);65 dwfl_thread_state_register_pc(thread, dwarf_nip);66 for (i = 0; i < ARRAY_SIZE(special_regs); i++) {67 Dwarf_Word val = 0;68 perf_reg_value(&val, user_regs, special_regs[i][1]);69 if (!dwfl_thread_state_registers(thread,70 special_regs[i][0], 1,71 &val))72 return false;73 }74 75 return true;76}77