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Message-ID: <38a0c7a1ec8d98238379a322866c0432befc259b.1588888003.git.mhelsley@vmware.com>
Date: Mon, 11 May 2020 10:35:13 -0700
From: Matt Helsley <mhelsley@...are.com>
To: <linux-kernel@...r.kernel.org>
CC: Josh Poimboeuf <jpoimboe@...hat.com>,
Peter Zijlstra <peterz@...radead.org>,
Julien Thierry <jthierry@...hat.com>,
Miroslav Benes <mbenes@...e.cz>,
Steven Rostedt <rostedt@...dmis.org>,
Matt Helsley <mhelsley@...are.com>
Subject: [RFC][PATCH 5/5] objtool: Report missing support for subcommands
The check and orc-related subcommands for objtool are x86-specific.
To make this clear to anyone using the tool return a non-zero exit
code and indicate in the help and usage output which commands are
(and are not) available.
Signed-off-by: Matt Helsley <mhelsley@...are.com>
---
tools/objtool/Build | 1 +
tools/objtool/arch/missing/check.c | 4 +++-
tools/objtool/arch/missing/orc_dump.c | 4 +++-
tools/objtool/builtin-check.c | 5 ++++
tools/objtool/builtin-orc.c | 7 ++++++
tools/objtool/builtin.h | 2 ++
tools/objtool/check.h | 1 +
tools/objtool/objtool.c | 34 +++++++++++++++++++++++----
tools/objtool/orc.h | 1 +
9 files changed, 52 insertions(+), 7 deletions(-)
diff --git a/tools/objtool/Build b/tools/objtool/Build
index fb6e6faf6f10..8e5ad5c238ba 100644
--- a/tools/objtool/Build
+++ b/tools/objtool/Build
@@ -1,3 +1,4 @@
+objtool-y += arch/missing/
objtool-y += arch/$(SRCARCH)/
objtool-$(SUBCMD_CHECK) += check.o
diff --git a/tools/objtool/arch/missing/check.c b/tools/objtool/arch/missing/check.c
index 5eac14c8c6a5..7f9deb0451bb 100644
--- a/tools/objtool/arch/missing/check.c
+++ b/tools/objtool/arch/missing/check.c
@@ -8,7 +8,9 @@
const char *objname;
-int __attribute__ ((weak)) check(const char *_objname, bool orc)
+int missing_check(const char *_objname, bool orc)
{
return 127;
}
+
+int __attribute__ ((weak, alias("missing_check"))) check(const char *_objname, bool orc);
diff --git a/tools/objtool/arch/missing/orc_dump.c b/tools/objtool/arch/missing/orc_dump.c
index f7ebb3a2ce9e..45367ddd08a4 100644
--- a/tools/objtool/arch/missing/orc_dump.c
+++ b/tools/objtool/arch/missing/orc_dump.c
@@ -5,7 +5,9 @@
#include "../../orc.h"
-int __attribute__ ((weak)) orc_dump(const char *_objname)
+int missing_orc_dump(const char *_objname)
{
return 127;
}
+
+int __attribute__ ((weak, alias("missing_orc_dump"))) orc_dump(const char *_objname);
diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c
index 10fbe75ab43d..7e7ad576ebc0 100644
--- a/tools/objtool/builtin-check.c
+++ b/tools/objtool/builtin-check.c
@@ -35,6 +35,11 @@ const struct option check_options[] = {
OPT_END(),
};
+bool is_cmd_check_available(void)
+{
+ return check != missing_check;
+}
+
int cmd_check(int argc, const char **argv)
{
const char *objname;
diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c
index e6e54ae4ab75..043b93f68e83 100644
--- a/tools/objtool/builtin-orc.c
+++ b/tools/objtool/builtin-orc.c
@@ -23,6 +23,13 @@ static const char *orc_usage[] = {
NULL,
};
+bool is_cmd_orc_available(void)
+{
+ if (check == missing_check)
+ return false;
+ return orc_dump != missing_orc_dump;
+}
+
int cmd_orc(int argc, const char **argv)
{
const char *objname;
diff --git a/tools/objtool/builtin.h b/tools/objtool/builtin.h
index 0b907902ee79..478558d38007 100644
--- a/tools/objtool/builtin.h
+++ b/tools/objtool/builtin.h
@@ -10,7 +10,9 @@
extern const struct option check_options[];
extern bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats;
+extern bool is_cmd_check_available(void);
extern int cmd_check(int argc, const char **argv);
+extern bool is_cmd_orc_available(void);
extern int cmd_orc(int argc, const char **argv);
#endif /* _BUILTIN_H */
diff --git a/tools/objtool/check.h b/tools/objtool/check.h
index 4d34bfc84dc7..c54fb9f5c8e6 100644
--- a/tools/objtool/check.h
+++ b/tools/objtool/check.h
@@ -9,6 +9,7 @@
#include <stdbool.h>
#include "objtool.h"
+int missing_check(const char *objname, bool orc);
int check(const char *objname, bool orc);
struct instruction *find_insn(struct objtool_file *file,
diff --git a/tools/objtool/objtool.c b/tools/objtool/objtool.c
index 593ec85915a9..e901c40c76ef 100644
--- a/tools/objtool/objtool.c
+++ b/tools/objtool/objtool.c
@@ -27,21 +27,22 @@ struct cmd_struct {
const char *name;
int (*fn)(int, const char **);
const char *help;
+ bool (*is_available)(void);
};
static const char objtool_usage_string[] =
"objtool COMMAND [ARGS]";
static struct cmd_struct objtool_cmds[] = {
- {"check", cmd_check, "Perform stack metadata validation on an object file" },
- {"orc", cmd_orc, "Generate in-place ORC unwind tables for an object file" },
+ {"check", cmd_check, "Perform stack metadata validation on an object file", is_cmd_check_available },
+ {"orc", cmd_orc, "Generate in-place ORC unwind tables for an object file", is_cmd_orc_available },
};
bool help;
static void cmd_usage(void)
{
- unsigned int i, longest = 0;
+ unsigned int i, longest = 0, num_unavail = 0;
printf("\n usage: %s\n\n", objtool_usage_string);
@@ -52,8 +53,26 @@ static void cmd_usage(void)
puts(" Commands:");
for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
- printf(" %-*s ", longest, objtool_cmds[i].name);
- puts(objtool_cmds[i].help);
+ struct cmd_struct *p = objtool_cmds+i;
+
+ if (!p->is_available()) {
+ num_unavail++;
+ continue;
+ }
+ printf(" %-*s ", longest, p->name);
+ puts(p->help);
+ }
+
+ if (num_unavail > 0) {
+ puts("\n Unavailable commands on this architecture:");
+ for (i = 0; i < ARRAY_SIZE(objtool_cmds); i++) {
+ struct cmd_struct *p = objtool_cmds+i;
+
+ if (p->is_available())
+ continue;
+ printf(" %-*s ", longest, p->name);
+ puts(p->help);
+ }
}
printf("\n");
@@ -96,6 +115,11 @@ static void handle_internal_command(int argc, const char **argv)
if (strcmp(p->name, cmd))
continue;
+ if (!p->is_available()) {
+ fprintf(stderr, "command %s is not available on this architecture\n", cmd);
+ exit(127);
+ }
+
ret = p->fn(argc, argv);
exit(ret);
diff --git a/tools/objtool/orc.h b/tools/objtool/orc.h
index c67f451d7610..9174356ba0fa 100644
--- a/tools/objtool/orc.h
+++ b/tools/objtool/orc.h
@@ -11,6 +11,7 @@ struct objtool_file;
int create_orc(struct objtool_file *file);
int create_orc_sections(struct objtool_file *file);
+int missing_orc_dump(const char *objname);
int orc_dump(const char *objname);
#endif /* _ORC_H */
--
2.20.1
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