189 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2#include <linux/objtool_types.h>3#include <asm/orc_types.h>4 5#include <objtool/check.h>6#include <objtool/orc.h>7#include <objtool/warn.h>8#include <objtool/endianness.h>9 10int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn)11{12 struct cfi_reg *bp = &cfi->regs[CFI_BP];13 14 memset(orc, 0, sizeof(*orc));15 16 if (!cfi) {17 /*18 * This is usually either unreachable nops/traps (which don't19 * trigger unreachable instruction warnings), or20 * STACK_FRAME_NON_STANDARD functions.21 */22 orc->type = ORC_TYPE_UNDEFINED;23 return 0;24 }25 26 switch (cfi->type) {27 case UNWIND_HINT_TYPE_UNDEFINED:28 orc->type = ORC_TYPE_UNDEFINED;29 return 0;30 case UNWIND_HINT_TYPE_END_OF_STACK:31 orc->type = ORC_TYPE_END_OF_STACK;32 return 0;33 case UNWIND_HINT_TYPE_CALL:34 orc->type = ORC_TYPE_CALL;35 break;36 case UNWIND_HINT_TYPE_REGS:37 orc->type = ORC_TYPE_REGS;38 break;39 case UNWIND_HINT_TYPE_REGS_PARTIAL:40 orc->type = ORC_TYPE_REGS_PARTIAL;41 break;42 default:43 WARN_INSN(insn, "unknown unwind hint type %d", cfi->type);44 return -1;45 }46 47 orc->signal = cfi->signal;48 49 switch (cfi->cfa.base) {50 case CFI_SP:51 orc->sp_reg = ORC_REG_SP;52 break;53 case CFI_SP_INDIRECT:54 orc->sp_reg = ORC_REG_SP_INDIRECT;55 break;56 case CFI_BP:57 orc->sp_reg = ORC_REG_BP;58 break;59 case CFI_BP_INDIRECT:60 orc->sp_reg = ORC_REG_BP_INDIRECT;61 break;62 case CFI_R10:63 orc->sp_reg = ORC_REG_R10;64 break;65 case CFI_R13:66 orc->sp_reg = ORC_REG_R13;67 break;68 case CFI_DI:69 orc->sp_reg = ORC_REG_DI;70 break;71 case CFI_DX:72 orc->sp_reg = ORC_REG_DX;73 break;74 default:75 WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base);76 return -1;77 }78 79 switch (bp->base) {80 case CFI_UNDEFINED:81 orc->bp_reg = ORC_REG_UNDEFINED;82 break;83 case CFI_CFA:84 orc->bp_reg = ORC_REG_PREV_SP;85 break;86 case CFI_BP:87 orc->bp_reg = ORC_REG_BP;88 break;89 default:90 WARN_INSN(insn, "unknown BP base reg %d", bp->base);91 return -1;92 }93 94 orc->sp_offset = cfi->cfa.offset;95 orc->bp_offset = bp->offset;96 97 return 0;98}99 100int write_orc_entry(struct elf *elf, struct section *orc_sec,101 struct section *ip_sec, unsigned int idx,102 struct section *insn_sec, unsigned long insn_off,103 struct orc_entry *o)104{105 struct orc_entry *orc;106 107 /* populate ORC data */108 orc = (struct orc_entry *)orc_sec->data->d_buf + idx;109 memcpy(orc, o, sizeof(*orc));110 orc->sp_offset = bswap_if_needed(elf, orc->sp_offset);111 orc->bp_offset = bswap_if_needed(elf, orc->bp_offset);112 113 /* populate reloc for ip */114 if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx,115 insn_sec, insn_off))116 return -1;117 118 return 0;119}120 121static const char *reg_name(unsigned int reg)122{123 switch (reg) {124 case ORC_REG_PREV_SP:125 return "prevsp";126 case ORC_REG_DX:127 return "dx";128 case ORC_REG_DI:129 return "di";130 case ORC_REG_BP:131 return "bp";132 case ORC_REG_SP:133 return "sp";134 case ORC_REG_R10:135 return "r10";136 case ORC_REG_R13:137 return "r13";138 case ORC_REG_BP_INDIRECT:139 return "bp(ind)";140 case ORC_REG_SP_INDIRECT:141 return "sp(ind)";142 default:143 return "?";144 }145}146 147static const char *orc_type_name(unsigned int type)148{149 switch (type) {150 case ORC_TYPE_UNDEFINED:151 return "(und)";152 case ORC_TYPE_END_OF_STACK:153 return "end";154 case ORC_TYPE_CALL:155 return "call";156 case ORC_TYPE_REGS:157 return "regs";158 case ORC_TYPE_REGS_PARTIAL:159 return "regs (partial)";160 default:161 return "?";162 }163}164 165static void print_reg(unsigned int reg, int offset)166{167 if (reg == ORC_REG_BP_INDIRECT)168 printf("(bp%+d)", offset);169 else if (reg == ORC_REG_SP_INDIRECT)170 printf("(sp)%+d", offset);171 else if (reg == ORC_REG_UNDEFINED)172 printf("(und)");173 else174 printf("%s%+d", reg_name(reg), offset);175}176 177void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i)178{179 printf("type:%s", orc_type_name(orc[i].type));180 181 printf(" sp:");182 print_reg(orc[i].sp_reg, bswap_if_needed(dummy_elf, orc[i].sp_offset));183 184 printf(" bp:");185 print_reg(orc[i].bp_reg, bswap_if_needed(dummy_elf, orc[i].bp_offset));186 187 printf(" signal:%d\n", orc[i].signal);188}189