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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | // SPDX-License-Identifier: GPL-2.0-or-later #include <linux/objtool_types.h> #include <asm/orc_types.h> #include <objtool/check.h> #include <objtool/orc.h> #include <objtool/warn.h> #include <objtool/endianness.h> int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi, struct instruction *insn) { struct cfi_reg *fp = &cfi->regs[CFI_FP]; struct cfi_reg *ra = &cfi->regs[CFI_RA]; memset(orc, 0, sizeof(*orc)); if (!cfi) { /* * This is usually either unreachable nops/traps (which don't * trigger unreachable instruction warnings), or * STACK_FRAME_NON_STANDARD functions. */ orc->type = ORC_TYPE_UNDEFINED; return 0; } switch (cfi->type) { case UNWIND_HINT_TYPE_UNDEFINED: orc->type = ORC_TYPE_UNDEFINED; return 0; case UNWIND_HINT_TYPE_END_OF_STACK: orc->type = ORC_TYPE_END_OF_STACK; return 0; case UNWIND_HINT_TYPE_CALL: orc->type = ORC_TYPE_CALL; break; case UNWIND_HINT_TYPE_REGS: orc->type = ORC_TYPE_REGS; break; case UNWIND_HINT_TYPE_REGS_PARTIAL: orc->type = ORC_TYPE_REGS_PARTIAL; break; default: WARN_INSN(insn, "unknown unwind hint type %d", cfi->type); return -1; } orc->signal = cfi->signal; switch (cfi->cfa.base) { case CFI_SP: orc->sp_reg = ORC_REG_SP; break; case CFI_FP: orc->sp_reg = ORC_REG_FP; break; default: WARN_INSN(insn, "unknown CFA base reg %d", cfi->cfa.base); return -1; } switch (fp->base) { case CFI_UNDEFINED: orc->fp_reg = ORC_REG_UNDEFINED; orc->fp_offset = 0; break; case CFI_CFA: orc->fp_reg = ORC_REG_PREV_SP; orc->fp_offset = fp->offset; break; case CFI_FP: orc->fp_reg = ORC_REG_FP; break; default: WARN_INSN(insn, "unknown FP base reg %d", fp->base); return -1; } switch (ra->base) { case CFI_UNDEFINED: orc->ra_reg = ORC_REG_UNDEFINED; orc->ra_offset = 0; break; case CFI_CFA: orc->ra_reg = ORC_REG_PREV_SP; orc->ra_offset = ra->offset; break; case CFI_FP: orc->ra_reg = ORC_REG_FP; break; default: WARN_INSN(insn, "unknown RA base reg %d", ra->base); return -1; } orc->sp_offset = cfi->cfa.offset; return 0; } int write_orc_entry(struct elf *elf, struct section *orc_sec, struct section *ip_sec, unsigned int idx, struct section *insn_sec, unsigned long insn_off, struct orc_entry *o) { struct orc_entry *orc; /* populate ORC data */ orc = (struct orc_entry *)orc_sec->data->d_buf + idx; memcpy(orc, o, sizeof(*orc)); /* populate reloc for ip */ if (!elf_init_reloc_text_sym(elf, ip_sec, idx * sizeof(int), idx, insn_sec, insn_off)) return -1; return 0; } static const char *reg_name(unsigned int reg) { switch (reg) { case ORC_REG_SP: return "sp"; case ORC_REG_FP: return "fp"; case ORC_REG_PREV_SP: return "prevsp"; default: return "?"; } } static const char *orc_type_name(unsigned int type) { switch (type) { case UNWIND_HINT_TYPE_CALL: return "call"; case UNWIND_HINT_TYPE_REGS: return "regs"; case UNWIND_HINT_TYPE_REGS_PARTIAL: return "regs (partial)"; default: return "?"; } } static void print_reg(unsigned int reg, int offset) { if (reg == ORC_REG_UNDEFINED) printf(" (und) "); else printf("%s + %3d", reg_name(reg), offset); } void orc_print_dump(struct elf *dummy_elf, struct orc_entry *orc, int i) { printf("type:%s", orc_type_name(orc[i].type)); printf(" sp:"); print_reg(orc[i].sp_reg, orc[i].sp_offset); printf(" fp:"); print_reg(orc[i].fp_reg, orc[i].fp_offset); printf(" ra:"); print_reg(orc[i].ra_reg, orc[i].ra_offset); printf(" signal:%d\n", orc[i].signal); } |