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Subject[PATCH v3 1/4] objtool: Move object file loading out of check
Date
Structure objtool_file can be used by different subcommands. In fact
it already is, by check and orc.

Provide a function that allows to initialize objtool_file, that builtin
can call, without relying on check to do the correct setup for them and
explicitly hand the objtool_file to them.

Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Julien Thierry <jthierry@redhat.com>
---
tools/objtool/builtin-check.c | 7 ++++++-
tools/objtool/builtin-orc.c | 8 ++++++-
tools/objtool/check.c | 39 +++++++++++------------------------
tools/objtool/objtool.c | 29 ++++++++++++++++++++++++++
tools/objtool/objtool.h | 4 +++-
tools/objtool/weak.c | 4 +---
6 files changed, 58 insertions(+), 33 deletions(-)

diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 7a44174967b5..698df1fa57f4 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -41,6 +41,7 @@ const struct option check_options[] = {
int cmd_check(int argc, const char **argv)
{
const char *objname, *s;
+ struct objtool_file *file;

argc = parse_options(argc, argv, check_options, check_usage, 0);

@@ -53,5 +54,9 @@ int cmd_check(int argc, const char **argv)
if (s && !s[9])
vmlinux = true;

- return check(objname, false);
+ file = objtool_setup_file(objname);
+ if (!file)
+ return 1;
+
+ return check(file, false);
}
diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c
index b1dfe2007962..5641d759f7a3 100644
--- a/tools/objtool/builtin-orc.c
+++ b/tools/objtool/builtin-orc.c
@@ -31,13 +31,19 @@ int cmd_orc(int argc, const char **argv)
usage_with_options(orc_usage, check_options);

if (!strncmp(argv[0], "gen", 3)) {
+ struct objtool_file *file;
+
argc = parse_options(argc, argv, check_options, orc_usage, 0);
if (argc != 1)
usage_with_options(orc_usage, check_options);

objname = argv[0];

- return check(objname, true);
+ file = objtool_setup_file(objname);
+ if (!file)
+ return 1;
+
+ return check(file, true);
}

if (!strcmp(argv[0], "dump")) {
diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index a2313ecce6d1..051f2ee6b4bc 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -27,7 +27,6 @@ struct alternative {
bool skip_orig;
};

-const char *objname;
struct cfi_init_state initial_func_cfi;

struct instruction *find_insn(struct objtool_file *file,
@@ -2751,36 +2750,22 @@ static int validate_reachable_instructions(struct objtool_file *file)
return 0;
}

-static struct objtool_file file;
-
-int check(const char *_objname, bool orc)
+int check(struct objtool_file *file, bool orc)
{
int ret, warnings = 0;

- objname = _objname;
-
- file.elf = elf_open_read(objname, O_RDWR);
- if (!file.elf)
- return 1;
-
- INIT_LIST_HEAD(&file.insn_list);
- hash_init(file.insn_hash);
- file.c_file = find_section_by_name(file.elf, ".comment");
- file.ignore_unreachables = no_unreachable;
- file.hints = false;
-
arch_initial_func_cfi_state(&initial_func_cfi);

- ret = decode_sections(&file);
+ ret = decode_sections(file);
if (ret < 0)
goto out;
warnings += ret;

- if (list_empty(&file.insn_list))
+ if (list_empty(&file->insn_list))
goto out;

if (vmlinux && !validate_dup) {
- ret = validate_vmlinux_functions(&file);
+ ret = validate_vmlinux_functions(file);
if (ret < 0)
goto out;

@@ -2789,41 +2774,41 @@ int check(const char *_objname, bool orc)
}

if (retpoline) {
- ret = validate_retpoline(&file);
+ ret = validate_retpoline(file);
if (ret < 0)
return ret;
warnings += ret;
}

- ret = validate_functions(&file);
+ ret = validate_functions(file);
if (ret < 0)
goto out;
warnings += ret;

- ret = validate_unwind_hints(&file, NULL);
+ ret = validate_unwind_hints(file, NULL);
if (ret < 0)
goto out;
warnings += ret;

if (!warnings) {
- ret = validate_reachable_instructions(&file);
+ ret = validate_reachable_instructions(file);
if (ret < 0)
goto out;
warnings += ret;
}

if (orc) {
- ret = create_orc(&file);
+ ret = create_orc(file);
if (ret < 0)
goto out;

- ret = create_orc_sections(&file);
+ ret = create_orc_sections(file);
if (ret < 0)
goto out;
}

- if (file.elf->changed) {
- ret = elf_write(file.elf);
+ if (file->elf->changed) {
+ ret = elf_write(file->elf);
if (ret < 0)
goto out;
}
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index 58fdda510653..d935522c7359 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -22,6 +22,8 @@
#include <linux/kernel.h>

#include "builtin.h"
+#include "objtool.h"
+#include "warn.h"

struct cmd_struct {
const char *name;
@@ -39,6 +41,33 @@ static struct cmd_struct objtool_cmds[] = {

bool help;

+const char *objname;
+static struct objtool_file file;
+
+struct objtool_file *objtool_setup_file(const char *_objname)
+{
+ if (objname) {
+ if (strcmp(objname, _objname)) {
+ WARN("won't handle more than one file at a time");
+ return NULL;
+ }
+ return &file;
+ }
+ objname = _objname;
+
+ file.elf = elf_open_read(objname, O_RDWR);
+ if (!file.elf)
+ return NULL;
+
+ INIT_LIST_HEAD(&file.insn_list);
+ hash_init(file.insn_hash);
+ file.c_file = find_section_by_name(file.elf, ".comment");
+ file.ignore_unreachables = no_unreachable;
+ file.hints = false;
+
+ return &file;
+}
+
static void cmd_usage(void)
{
unsigned int i, longest = 0;
diff --git a/tools/objtool/objtool.h b/tools/objtool/objtool.h
index 528028a66816..62f0ab49dc0c 100644
--- a/tools/objtool/objtool.h
+++ b/tools/objtool/objtool.h
@@ -19,7 +19,9 @@ struct objtool_file {
bool ignore_unreachables, c_file, hints, rodata;
};

-int check(const char *objname, bool orc);
+struct objtool_file *objtool_setup_file(const char *_objname);
+
+int check(struct objtool_file *file, bool orc);
int orc_dump(const char *objname);
int create_orc(struct objtool_file *file);
int create_orc_sections(struct objtool_file *file);
diff --git a/tools/objtool/weak.c b/tools/objtool/weak.c
index 942ea5e8ac36..82698319f008 100644
--- a/tools/objtool/weak.c
+++ b/tools/objtool/weak.c
@@ -17,9 +17,7 @@
return ENOSYS; \
})

-const char __weak *objname;
-
-int __weak check(const char *_objname, bool orc)
+int __weak check(struct objtool_file *file, bool orc)
{
UNSUPPORTED("check subcommand");
}
--
2.21.3
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