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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - tools/objtool/orc_gen.c
3f98dcfbc177b12147f491d9fd577916c02b2076
2 * Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses/>.
25 int create_orc(struct objtool_file
*file
)
27 struct instruction
*insn
;
29 for_each_insn(file
, insn
) {
30 struct orc_entry
*orc
= &insn
->orc
;
31 struct cfi_reg
*cfa
= &insn
->state
.cfa
;
32 struct cfi_reg
*bp
= &insn
->state
.regs
[CFI_BP
];
34 orc
->end
= insn
->state
.end
;
36 if (cfa
->base
== CFI_UNDEFINED
) {
37 orc
->sp_reg
= ORC_REG_UNDEFINED
;
43 orc
->sp_reg
= ORC_REG_SP
;
46 orc
->sp_reg
= ORC_REG_SP_INDIRECT
;
49 orc
->sp_reg
= ORC_REG_BP
;
52 orc
->sp_reg
= ORC_REG_BP_INDIRECT
;
55 orc
->sp_reg
= ORC_REG_R10
;
58 orc
->sp_reg
= ORC_REG_R13
;
61 orc
->sp_reg
= ORC_REG_DI
;
64 orc
->sp_reg
= ORC_REG_DX
;
67 WARN_FUNC("unknown CFA base reg %d",
68 insn
->sec
, insn
->offset
, cfa
->base
);
74 orc
->bp_reg
= ORC_REG_UNDEFINED
;
77 orc
->bp_reg
= ORC_REG_PREV_SP
;
80 orc
->bp_reg
= ORC_REG_BP
;
83 WARN_FUNC("unknown BP base reg %d",
84 insn
->sec
, insn
->offset
, bp
->base
);
88 orc
->sp_offset
= cfa
->offset
;
89 orc
->bp_offset
= bp
->offset
;
90 orc
->type
= insn
->state
.type
;
96 static int create_orc_entry(struct section
*u_sec
, struct section
*ip_relasec
,
97 unsigned int idx
, struct section
*insn_sec
,
98 unsigned long insn_off
, struct orc_entry
*o
)
100 struct orc_entry
*orc
;
103 if (!insn_sec
->sym
) {
104 WARN("missing symbol for section %s", insn_sec
->name
);
108 /* populate ORC data */
109 orc
= (struct orc_entry
*)u_sec
->data
->d_buf
+ idx
;
110 memcpy(orc
, o
, sizeof(*orc
));
112 /* populate rela for ip */
113 rela
= malloc(sizeof(*rela
));
118 memset(rela
, 0, sizeof(*rela
));
120 rela
->sym
= insn_sec
->sym
;
121 rela
->addend
= insn_off
;
122 rela
->type
= R_X86_64_PC32
;
123 rela
->offset
= idx
* sizeof(int);
125 list_add_tail(&rela
->list
, &ip_relasec
->rela_list
);
126 hash_add(ip_relasec
->rela_hash
, &rela
->hash
, rela
->offset
);
131 int create_orc_sections(struct objtool_file
*file
)
133 struct instruction
*insn
, *prev_insn
;
134 struct section
*sec
, *u_sec
, *ip_relasec
;
137 struct orc_entry empty
= {
138 .sp_reg
= ORC_REG_UNDEFINED
,
139 .bp_reg
= ORC_REG_UNDEFINED
,
140 .type
= ORC_TYPE_CALL
,
143 sec
= find_section_by_name(file
->elf
, ".orc_unwind");
145 WARN("file already has .orc_unwind section, skipping");
149 /* count the number of needed orcs */
151 for_each_sec(file
, sec
) {
156 sec_for_each_insn(file
, sec
, insn
) {
158 memcmp(&insn
->orc
, &prev_insn
->orc
,
159 sizeof(struct orc_entry
))) {
165 /* section terminator */
173 /* create .orc_unwind_ip and .rela.orc_unwind_ip sections */
174 sec
= elf_create_section(file
->elf
, ".orc_unwind_ip", sizeof(int), idx
);
178 ip_relasec
= elf_create_rela_section(file
->elf
, sec
);
182 /* create .orc_unwind section */
183 u_sec
= elf_create_section(file
->elf
, ".orc_unwind",
184 sizeof(struct orc_entry
), idx
);
186 /* populate sections */
188 for_each_sec(file
, sec
) {
193 sec_for_each_insn(file
, sec
, insn
) {
194 if (!prev_insn
|| memcmp(&insn
->orc
, &prev_insn
->orc
,
195 sizeof(struct orc_entry
))) {
197 if (create_orc_entry(u_sec
, ip_relasec
, idx
,
198 insn
->sec
, insn
->offset
,
207 /* section terminator */
209 if (create_orc_entry(u_sec
, ip_relasec
, idx
,
211 prev_insn
->offset
+ prev_insn
->len
,
219 if (elf_rebuild_rela_section(ip_relasec
))