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objtool: Refactor ORC section generation

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commit ab4e0744e99b87e1a223e89fc3c9ae44f727c9a6 upstream.

Decouple ORC entries from instructions.  This simplifies the
control/data flow, and is going to make it easier to support alternative
instructions which change the stack layout.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Josh Poimboeuf 2020-12-17 15:02:42 -06:00 committed by Greg Kroah-Hartman
parent dd87aa5f61
commit 1d516bd72a
7 changed files with 146 additions and 165 deletions
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4
tools/objtool/Makefile
View File

@ -46,10 +46,6 @@ ifeq ($(SRCARCH),x86)
SUBCMD_ORC := y
endif
ifeq ($(SUBCMD_ORC),y)
CFLAGS += -DINSN_USE_ORC
endif
export SUBCMD_CHECK SUBCMD_ORC
export srctree OUTPUT CFLAGS SRCARCH AWK
include $(srctree)/tools/build/Makefile.include

4
tools/objtool/arch.h
View File

@ -11,10 +11,6 @@
#include "objtool.h"
#include "cfi.h"
#ifdef INSN_USE_ORC
#include <asm/orc_types.h>
#endif
enum insn_type {
INSN_JUMP_CONDITIONAL,
INSN_JUMP_UNCONDITIONAL,

6
tools/objtool/builtin-orc.c
View File

@ -51,11 +51,7 @@ int cmd_orc(int argc, const char **argv)
if (list_empty(&file->insn_list))
return 0;
ret = create_orc(file);
if (ret)
return ret;
ret = create_orc_sections(file);
ret = orc_create(file);
if (ret)
return ret;

3
tools/objtool/check.h
View File

@ -43,9 +43,6 @@ struct instruction {
struct symbol *func;
struct list_head stack_ops;
struct cfi_state cfi;
#ifdef INSN_USE_ORC
struct orc_entry orc;
#endif
};
static inline bool is_static_jump(struct instruction *insn)

3
tools/objtool/objtool.h
View File

@ -26,7 +26,6 @@ struct objtool_file *objtool_open_read(const char *_objname);
int check(struct objtool_file *file);
int orc_dump(const char *objname);
int create_orc(struct objtool_file *file);
int create_orc_sections(struct objtool_file *file);
int orc_create(struct objtool_file *file);
#endif /* _OBJTOOL_H */

184
tools/objtool/orc_gen.c
View File

@ -12,26 +12,21 @@
#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 = container_of(cfi, struct instruction, cfi);
struct cfi_reg *bp = &cfi->regs[CFI_BP];
for_each_insn(file, insn) {
struct orc_entry *orc = &insn->orc;
struct cfi_reg *cfa = &insn->cfi.cfa;
struct cfi_reg *bp = &insn->cfi.regs[CFI_BP];
memset(orc, 0, sizeof(*orc));
if (!insn->sec->text)
continue;
orc->end = cfi->end;
orc->end = insn->cfi.end;
if (cfa->base == CFI_UNDEFINED) {
if (cfi->cfa.base == CFI_UNDEFINED) {
orc->sp_reg = ORC_REG_UNDEFINED;
continue;
return 0;
}
switch (cfa->base) {
switch (cfi->cfa.base) {
case CFI_SP:
orc->sp_reg = ORC_REG_SP;
break;
@ -58,7 +53,7 @@ int create_orc(struct objtool_file *file)
break;
default:
WARN_FUNC("unknown CFA base reg %d",
insn->sec, insn->offset, cfa->base);
insn->sec, insn->offset, cfi->cfa.base);
return -1;
}
@ -78,23 +73,23 @@ int create_orc(struct objtool_file *file)
return -1;
}
orc->sp_offset = cfa->offset;
orc->sp_offset = cfi->cfa.offset;
orc->bp_offset = bp->offset;
orc->type = insn->cfi.type;
}
orc->type = cfi->type;
return 0;
}
static int create_orc_entry(struct elf *elf, struct section *u_sec, struct section *ip_relocsec,
unsigned int idx, struct section *insn_sec,
unsigned long insn_off, struct orc_entry *o)
static int write_orc_entry(struct elf *elf, struct section *orc_sec,
struct section *ip_rsec, unsigned int idx,
struct section *insn_sec, unsigned long insn_off,
struct orc_entry *o)
{
struct orc_entry *orc;
struct reloc *reloc;
/* populate ORC data */
orc = (struct orc_entry *)u_sec->data->d_buf + idx;
orc = (struct orc_entry *)orc_sec->data->d_buf + idx;
memcpy(orc, o, sizeof(*orc));
/* populate reloc for ip */
@ -114,102 +109,109 @@ static int create_orc_entry(struct elf *elf, struct section *u_sec, struct secti
reloc->type = R_X86_64_PC32;
reloc->offset = idx * sizeof(int);
reloc->sec = ip_relocsec;
reloc->sec = ip_rsec;
elf_add_reloc(elf, reloc);
return 0;
}
int create_orc_sections(struct objtool_file *file)
{
struct instruction *insn, *prev_insn;
struct section *sec, *u_sec, *ip_relocsec;
unsigned int idx;
struct orc_list_entry {
struct list_head list;
struct orc_entry orc;
struct section *insn_sec;
unsigned long insn_off;
};
struct orc_entry empty = {
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;
}
int orc_create(struct objtool_file *file)
{
struct section *sec, *ip_rsec, *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 = 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) {
if (init_orc_entry(&orc, &insn->cfi))
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;
}
/* 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", 0, sizeof(int), idx);
sec = elf_create_section(file->elf, ".orc_unwind_ip", 0, sizeof(int), nr);
if (!sec)
return -1;
ip_relocsec = elf_create_reloc_section(file->elf, sec, SHT_RELA);
if (!ip_relocsec)
ip_rsec = elf_create_reloc_section(file->elf, sec, SHT_RELA);
if (!ip_rsec)
return -1;
/* create .orc_unwind section */
u_sec = elf_create_section(file->elf, ".orc_unwind", 0,
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(file->elf, u_sec, ip_relocsec, idx,
insn->sec, insn->offset,
&insn->orc))
/* Write ORC entries to sections: */
list_for_each_entry(entry, &orc_list, list) {
if (write_orc_entry(file->elf, orc_sec, ip_rsec, idx++,
entry->insn_sec, entry->insn_off,
&entry->orc))
return -1;
idx++;
}
prev_insn = insn;
}
/* section terminator */
if (prev_insn) {
if (create_orc_entry(file->elf, u_sec, ip_relocsec, idx,
prev_insn->sec,
prev_insn->offset + prev_insn->len,
&empty))
return -1;
idx++;
}
}
if (elf_rebuild_reloc_section(file->elf, ip_relocsec))
if (elf_rebuild_reloc_section(file->elf, ip_rsec))
return -1;
return 0;

7
tools/objtool/weak.c
View File

@ -25,12 +25,7 @@ int __weak orc_dump(const char *_objname)
UNSUPPORTED("orc");
}
int __weak create_orc(struct objtool_file *file)
{
UNSUPPORTED("orc");
}
int __weak create_orc_sections(struct objtool_file *file)
int __weak orc_create(struct objtool_file *file)
{
UNSUPPORTED("orc");
}