1 // SPDX-License-Identifier: GPL-2.0 2 #include <elfutils/libdwfl.h> 3 #include <linux/kernel.h> 4 #include "../../../util/unwind-libdw.h" 5 #include "../../../util/perf_regs.h" 6 #include "../../../util/sample.h" 7 8 /* See backends/ppc_initreg.c and backends/ppc_regs.c in elfutils. */ 9 static const int special_regs[3][2] = { 10 { 65, PERF_REG_POWERPC_LINK }, 11 { 101, PERF_REG_POWERPC_XER }, 12 { 109, PERF_REG_POWERPC_CTR }, 13 }; 14 15 bool libdw__arch_set_initial_registers(Dwfl_Thread *thread, void *arg) 16 { 17 struct unwind_info *ui = arg; 18 struct regs_dump *user_regs = &ui->sample->user_regs; 19 Dwarf_Word dwarf_regs[32], dwarf_nip; 20 size_t i; 21 22 #define REG(r) ({ \ 23 Dwarf_Word val = 0; \ 24 perf_reg_value(&val, user_regs, PERF_REG_POWERPC_##r); \ 25 val; \ 26 }) 27 28 dwarf_regs[0] = REG(R0); 29 dwarf_regs[1] = REG(R1); 30 dwarf_regs[2] = REG(R2); 31 dwarf_regs[3] = REG(R3); 32 dwarf_regs[4] = REG(R4); 33 dwarf_regs[5] = REG(R5); 34 dwarf_regs[6] = REG(R6); 35 dwarf_regs[7] = REG(R7); 36 dwarf_regs[8] = REG(R8); 37 dwarf_regs[9] = REG(R9); 38 dwarf_regs[10] = REG(R10); 39 dwarf_regs[11] = REG(R11); 40 dwarf_regs[12] = REG(R12); 41 dwarf_regs[13] = REG(R13); 42 dwarf_regs[14] = REG(R14); 43 dwarf_regs[15] = REG(R15); 44 dwarf_regs[16] = REG(R16); 45 dwarf_regs[17] = REG(R17); 46 dwarf_regs[18] = REG(R18); 47 dwarf_regs[19] = REG(R19); 48 dwarf_regs[20] = REG(R20); 49 dwarf_regs[21] = REG(R21); 50 dwarf_regs[22] = REG(R22); 51 dwarf_regs[23] = REG(R23); 52 dwarf_regs[24] = REG(R24); 53 dwarf_regs[25] = REG(R25); 54 dwarf_regs[26] = REG(R26); 55 dwarf_regs[27] = REG(R27); 56 dwarf_regs[28] = REG(R28); 57 dwarf_regs[29] = REG(R29); 58 dwarf_regs[30] = REG(R30); 59 dwarf_regs[31] = REG(R31); 60 if (!dwfl_thread_state_registers(thread, 0, 32, dwarf_regs)) 61 return false; 62 63 dwarf_nip = REG(NIP); 64 dwfl_thread_state_register_pc(thread, dwarf_nip); 65 for (i = 0; i < ARRAY_SIZE(special_regs); i++) { 66 Dwarf_Word val = 0; 67 perf_reg_value(&val, user_regs, special_regs[i][1]); 68 if (!dwfl_thread_state_registers(thread, 69 special_regs[i][0], 1, 70 &val)) 71 return false; 72 } 73 74 return true; 75 } 76