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