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Subject[PATCH v3 4/4] objtool: orc_gen: Move orc_entry out of instruction structure
Date
One orc_entry is associated with each instruction in the object file,
but having the orc_entry contained by the instruction structure forces
architectures not implementing the orc subcommands to provide a dummy
definition of the orc_entry.

Avoid that by having orc_entries in a separate list, part of the
objtool_file.

Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
tools/objtool/check.h | 1 -
tools/objtool/objtool.c | 1 +
tools/objtool/objtool.h | 1 +
tools/objtool/orc_gen.c | 80 ++++++++++++++++++++++-------------------
4 files changed, 46 insertions(+), 37 deletions(-)

diff --git a/tools/objtool/check.h b/tools/objtool/check.h
index 061aa96e15d3..059c43bfeb18 100644
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -42,7 +42,6 @@ struct instruction {
struct symbol *func;
struct list_head stack_ops;
struct cfi_state cfi;
- struct orc_entry orc;
};

struct instruction *find_insn(struct objtool_file *file,
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index d935522c7359..fb66126b00b6 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -61,6 +61,7 @@ struct objtool_file *objtool_setup_file(const char *_objname)

INIT_LIST_HEAD(&file.insn_list);
hash_init(file.insn_hash);
+ INIT_LIST_HEAD(&file.orc_data_list);
file.c_file = find_section_by_name(file.elf, ".comment");
file.ignore_unreachables = no_unreachable;
file.hints = false;
diff --git a/tools/objtool/objtool.h b/tools/objtool/objtool.h
index 44415ed8c7be..e61b486d4c05 100644
--- a/tools/objtool/objtool.h
+++ b/tools/objtool/objtool.h
@@ -16,6 +16,7 @@ struct objtool_file {
struct elf *elf;
struct list_head insn_list;
DECLARE_HASHTABLE(insn_hash, 20);
+ struct list_head orc_data_list;
bool ignore_unreachables, c_file, hints, rodata;
};

diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c
index 66fd56c33303..00f1efd05653 100644
--- a/tools/objtool/orc_gen.c
+++ b/tools/objtool/orc_gen.c
@@ -9,18 +9,33 @@
#include "check.h"
#include "warn.h"

+struct orc_data {
+ struct list_head list;
+ struct instruction *insn;
+ struct orc_entry orc;
+};
+
int create_orc(struct objtool_file *file)
{
struct instruction *insn;

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];
+ struct orc_entry *orc;
+ struct orc_data *od;

if (!insn->sec->text)
continue;

+ od = calloc(1, sizeof(*od));
+ if (!od)
+ return -1;
+ od->insn = insn;
+ list_add_tail(&od->list, &file->orc_data_list);
+
+ orc = &od->orc;
+
orc->end = insn->cfi.end;

if (cfa->base == CFI_UNDEFINED) {
@@ -139,7 +154,7 @@ static int create_orc_entry(struct elf *elf, struct section *u_sec, struct secti

int create_orc_sections(struct objtool_file *file)
{
- struct instruction *insn, *prev_insn;
+ struct orc_data *od, *prev_od;
struct section *sec, *u_sec, *ip_relocsec;
unsigned int idx;

@@ -157,23 +172,21 @@ int create_orc_sections(struct objtool_file *file)

/* 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;
+ prev_od = NULL;
+ list_for_each_entry(od, &file->orc_data_list, list) {
+ if (!prev_od ||
+ memcmp(&od->orc, &prev_od->orc, sizeof(struct orc_entry))) {
+ idx++;
}

+ prev_od = od;
+
/* section terminator */
- if (prev_insn)
+ if (list_is_last(&od->insn->list, &file->insn_list) ||
+ list_next_entry(od->insn, list)->sec != od->insn->sec) {
+ prev_od = NULL;
idx++;
+ }
}
if (!idx)
return -1;
@@ -194,33 +207,28 @@ int create_orc_sections(struct objtool_file *file)

/* 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))
- return -1;
-
- idx++;
- }
- prev_insn = insn;
+ prev_od = NULL;
+ list_for_each_entry(od, &file->orc_data_list, list) {
+ if (!prev_od ||
+ memcmp(&od->orc, &prev_od->orc, sizeof(struct orc_entry))) {
+ if (create_orc_entry(file->elf, u_sec, ip_relocsec, idx,
+ od->insn->sec, od->insn->offset,
+ &od->orc))
+ return -1;
+ idx++;
}

+ prev_od = od;
+
/* section terminator */
- if (prev_insn) {
+ if (list_is_last(&od->insn->list, &file->insn_list) ||
+ list_next_entry(od->insn, list)->sec != od->insn->sec) {
if (create_orc_entry(file->elf, u_sec, ip_relocsec, idx,
- prev_insn->sec,
- prev_insn->offset + prev_insn->len,
+ prev_od->insn->sec,
+ prev_od->insn->offset + prev_od->insn->len,
&empty))
return -1;
-
+ prev_od = NULL;
idx++;
}
}
--
2.21.3
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