From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file
---
kernel/tools/objtool/orc_gen.c | 394 ++++++++++++++++++++++++++++----------------------------
1 files changed, 197 insertions(+), 197 deletions(-)
diff --git a/kernel/tools/objtool/orc_gen.c b/kernel/tools/objtool/orc_gen.c
index 0b1ba8e..812b33e 100644
--- a/kernel/tools/objtool/orc_gen.c
+++ b/kernel/tools/objtool/orc_gen.c
@@ -1,242 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2017 Josh Poimboeuf <jpoimboe@redhat.com>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2
- * of the License, or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
-#include "orc.h"
+#include <linux/objtool.h>
+#include <asm/orc_types.h>
+
#include "check.h"
#include "warn.h"
-int create_orc(struct objtool_file *file)
+static int init_orc_entry(struct orc_entry *orc, struct cfi_state *cfi,
+ struct instruction *insn)
{
- struct instruction *insn;
+ struct cfi_reg *bp = &cfi->regs[CFI_BP];
- for_each_insn(file, insn) {
- struct orc_entry *orc = &insn->orc;
- struct cfi_reg *cfa = &insn->state.cfa;
- struct cfi_reg *bp = &insn->state.regs[CFI_BP];
+ memset(orc, 0, sizeof(*orc));
- orc->end = insn->state.end;
-
- if (cfa->base == CFI_UNDEFINED) {
- orc->sp_reg = ORC_REG_UNDEFINED;
- continue;
- }
-
- switch (cfa->base) {
- case CFI_SP:
- orc->sp_reg = ORC_REG_SP;
- break;
- case CFI_SP_INDIRECT:
- orc->sp_reg = ORC_REG_SP_INDIRECT;
- break;
- case CFI_BP:
- orc->sp_reg = ORC_REG_BP;
- break;
- case CFI_BP_INDIRECT:
- orc->sp_reg = ORC_REG_BP_INDIRECT;
- break;
- case CFI_R10:
- orc->sp_reg = ORC_REG_R10;
- break;
- case CFI_R13:
- orc->sp_reg = ORC_REG_R13;
- break;
- case CFI_DI:
- orc->sp_reg = ORC_REG_DI;
- break;
- case CFI_DX:
- orc->sp_reg = ORC_REG_DX;
- break;
- default:
- WARN_FUNC("unknown CFA base reg %d",
- insn->sec, insn->offset, cfa->base);
- return -1;
- }
-
- switch(bp->base) {
- case CFI_UNDEFINED:
- orc->bp_reg = ORC_REG_UNDEFINED;
- break;
- case CFI_CFA:
- orc->bp_reg = ORC_REG_PREV_SP;
- break;
- case CFI_BP:
- orc->bp_reg = ORC_REG_BP;
- break;
- default:
- WARN_FUNC("unknown BP base reg %d",
- insn->sec, insn->offset, bp->base);
- return -1;
- }
-
- orc->sp_offset = cfa->offset;
- orc->bp_offset = bp->offset;
- orc->type = insn->state.type;
+ if (!cfi) {
+ orc->end = 0;
+ orc->sp_reg = ORC_REG_UNDEFINED;
+ return 0;
}
- return 0;
-}
+ orc->end = cfi->end;
-static int create_orc_entry(struct section *u_sec, struct section *ip_relasec,
- unsigned int idx, struct section *insn_sec,
- unsigned long insn_off, struct orc_entry *o)
-{
- struct orc_entry *orc;
- struct rela *rela;
+ if (cfi->cfa.base == CFI_UNDEFINED) {
+ orc->sp_reg = ORC_REG_UNDEFINED;
+ return 0;
+ }
- /* populate ORC data */
- orc = (struct orc_entry *)u_sec->data->d_buf + idx;
- memcpy(orc, o, sizeof(*orc));
-
- /* populate rela for ip */
- rela = malloc(sizeof(*rela));
- if (!rela) {
- perror("malloc");
+ switch (cfi->cfa.base) {
+ case CFI_SP:
+ orc->sp_reg = ORC_REG_SP;
+ break;
+ case CFI_SP_INDIRECT:
+ orc->sp_reg = ORC_REG_SP_INDIRECT;
+ break;
+ case CFI_BP:
+ orc->sp_reg = ORC_REG_BP;
+ break;
+ case CFI_BP_INDIRECT:
+ orc->sp_reg = ORC_REG_BP_INDIRECT;
+ break;
+ case CFI_R10:
+ orc->sp_reg = ORC_REG_R10;
+ break;
+ case CFI_R13:
+ orc->sp_reg = ORC_REG_R13;
+ break;
+ case CFI_DI:
+ orc->sp_reg = ORC_REG_DI;
+ break;
+ case CFI_DX:
+ orc->sp_reg = ORC_REG_DX;
+ break;
+ default:
+ WARN_FUNC("unknown CFA base reg %d",
+ insn->sec, insn->offset, cfi->cfa.base);
return -1;
}
- memset(rela, 0, sizeof(*rela));
- if (insn_sec->sym) {
- rela->sym = insn_sec->sym;
- rela->addend = insn_off;
- } else {
- /*
- * The Clang assembler doesn't produce section symbols, so we
- * have to reference the function symbol instead:
- */
- rela->sym = find_symbol_containing(insn_sec, insn_off);
- if (!rela->sym) {
- /*
- * Hack alert. This happens when we need to reference
- * the NOP pad insn immediately after the function.
- */
- rela->sym = find_symbol_containing(insn_sec,
- insn_off - 1);
- }
- if (!rela->sym) {
- WARN("missing symbol for insn at offset 0x%lx\n",
- insn_off);
- return -1;
- }
-
- rela->addend = insn_off - rela->sym->offset;
+ switch (bp->base) {
+ case CFI_UNDEFINED:
+ orc->bp_reg = ORC_REG_UNDEFINED;
+ break;
+ case CFI_CFA:
+ orc->bp_reg = ORC_REG_PREV_SP;
+ break;
+ case CFI_BP:
+ orc->bp_reg = ORC_REG_BP;
+ break;
+ default:
+ WARN_FUNC("unknown BP base reg %d",
+ insn->sec, insn->offset, bp->base);
+ return -1;
}
- rela->type = R_X86_64_PC32;
- rela->offset = idx * sizeof(int);
-
- list_add_tail(&rela->list, &ip_relasec->rela_list);
- hash_add(ip_relasec->rela_hash, &rela->hash, rela->offset);
+ orc->sp_offset = cfi->cfa.offset;
+ orc->bp_offset = bp->offset;
+ orc->type = cfi->type;
return 0;
}
-int create_orc_sections(struct objtool_file *file)
+static 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 instruction *insn, *prev_insn;
- struct section *sec, *u_sec, *ip_relasec;
- unsigned int idx;
+ struct orc_entry *orc;
- struct orc_entry empty = {
- .sp_reg = ORC_REG_UNDEFINED,
+ /* populate ORC data */
+ orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
+ memcpy(orc, o, sizeof(*orc));
+
+ /* populate reloc for ip */
+ if (elf_add_reloc_to_insn(elf, ip_sec, idx * sizeof(int), R_X86_64_PC32,
+ insn_sec, insn_off))
+ return -1;
+
+ return 0;
+}
+
+struct orc_list_entry {
+ struct list_head list;
+ struct orc_entry orc;
+ struct section *insn_sec;
+ unsigned long insn_off;
+};
+
+static int orc_list_add(struct list_head *orc_list, struct orc_entry *orc,
+ struct section *sec, unsigned long offset)
+{
+ struct orc_list_entry *entry = malloc(sizeof(*entry));
+
+ if (!entry) {
+ WARN("malloc failed");
+ return -1;
+ }
+
+ entry->orc = *orc;
+ entry->insn_sec = sec;
+ entry->insn_off = offset;
+
+ list_add_tail(&entry->list, orc_list);
+ return 0;
+}
+
+static unsigned long alt_group_len(struct alt_group *alt_group)
+{
+ return alt_group->last_insn->offset +
+ alt_group->last_insn->len -
+ alt_group->first_insn->offset;
+}
+
+int orc_create(struct objtool_file *file)
+{
+ struct section *sec, *orc_sec;
+ unsigned int nr = 0, idx = 0;
+ struct orc_list_entry *entry;
+ struct list_head orc_list;
+
+ struct orc_entry null = {
+ .sp_reg = ORC_REG_UNDEFINED,
.bp_reg = ORC_REG_UNDEFINED,
- .type = ORC_TYPE_CALL,
+ .type = UNWIND_HINT_TYPE_CALL,
};
+ /* Build a deduplicated list of ORC entries: */
+ INIT_LIST_HEAD(&orc_list);
+ for_each_sec(file, sec) {
+ struct orc_entry orc, prev_orc = {0};
+ struct instruction *insn;
+ bool empty = true;
+
+ if (!sec->text)
+ continue;
+
+ sec_for_each_insn(file, sec, insn) {
+ struct alt_group *alt_group = insn->alt_group;
+ int i;
+
+ if (!alt_group) {
+ if (init_orc_entry(&orc, insn->cfi, insn))
+ return -1;
+ if (!memcmp(&prev_orc, &orc, sizeof(orc)))
+ continue;
+ if (orc_list_add(&orc_list, &orc, sec,
+ insn->offset))
+ return -1;
+ nr++;
+ prev_orc = orc;
+ empty = false;
+ continue;
+ }
+
+ /*
+ * Alternatives can have different stack layout
+ * possibilities (but they shouldn't conflict).
+ * Instead of traversing the instructions, use the
+ * alt_group's flattened byte-offset-addressed CFI
+ * array.
+ */
+ for (i = 0; i < alt_group_len(alt_group); i++) {
+ struct cfi_state *cfi = alt_group->cfi[i];
+ if (!cfi)
+ continue;
+ /* errors are reported on the original insn */
+ if (init_orc_entry(&orc, cfi, insn))
+ return -1;
+ if (!memcmp(&prev_orc, &orc, sizeof(orc)))
+ continue;
+ if (orc_list_add(&orc_list, &orc, insn->sec,
+ insn->offset + i))
+ return -1;
+ nr++;
+ prev_orc = orc;
+ empty = false;
+ }
+
+ /* Skip to the end of the alt_group */
+ insn = alt_group->last_insn;
+ }
+
+ /* Add a section terminator */
+ if (!empty) {
+ orc_list_add(&orc_list, &null, sec, sec->len);
+ nr++;
+ }
+ }
+ if (!nr)
+ return 0;
+
+ /* Create .orc_unwind, .orc_unwind_ip and .rela.orc_unwind_ip sections: */
sec = find_section_by_name(file->elf, ".orc_unwind");
if (sec) {
WARN("file already has .orc_unwind section, skipping");
return -1;
}
-
- /* count the number of needed orcs */
- idx = 0;
- for_each_sec(file, sec) {
- if (!sec->text)
- continue;
-
- prev_insn = NULL;
- sec_for_each_insn(file, sec, insn) {
- if (!prev_insn ||
- memcmp(&insn->orc, &prev_insn->orc,
- sizeof(struct orc_entry))) {
- idx++;
- }
- prev_insn = insn;
- }
-
- /* section terminator */
- if (prev_insn)
- idx++;
- }
- if (!idx)
+ orc_sec = elf_create_section(file->elf, ".orc_unwind", 0,
+ sizeof(struct orc_entry), nr);
+ if (!orc_sec)
return -1;
-
- /* create .orc_unwind_ip and .rela.orc_unwind_ip sections */
- sec = elf_create_section(file->elf, ".orc_unwind_ip", sizeof(int), idx);
+ sec = elf_create_section(file->elf, ".orc_unwind_ip", 0, sizeof(int), nr);
if (!sec)
return -1;
- ip_relasec = elf_create_rela_section(file->elf, sec);
- if (!ip_relasec)
- return -1;
-
- /* create .orc_unwind section */
- u_sec = elf_create_section(file->elf, ".orc_unwind",
- sizeof(struct orc_entry), idx);
-
- /* populate sections */
- idx = 0;
- for_each_sec(file, sec) {
- if (!sec->text)
- continue;
-
- prev_insn = NULL;
- sec_for_each_insn(file, sec, insn) {
- if (!prev_insn || memcmp(&insn->orc, &prev_insn->orc,
- sizeof(struct orc_entry))) {
-
- if (create_orc_entry(u_sec, ip_relasec, idx,
- insn->sec, insn->offset,
- &insn->orc))
- return -1;
-
- idx++;
- }
- prev_insn = insn;
- }
-
- /* section terminator */
- if (prev_insn) {
- if (create_orc_entry(u_sec, ip_relasec, idx,
- prev_insn->sec,
- prev_insn->offset + prev_insn->len,
- &empty))
- return -1;
-
- idx++;
- }
+ /* Write ORC entries to sections: */
+ list_for_each_entry(entry, &orc_list, list) {
+ if (write_orc_entry(file->elf, orc_sec, sec, idx++,
+ entry->insn_sec, entry->insn_off,
+ &entry->orc))
+ return -1;
}
-
- if (elf_rebuild_rela_section(ip_relasec))
- return -1;
return 0;
}
--
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