From: Matt Helsley Date: Tue, 19 May 2020 20:55:33 +0000 (-0700) Subject: objtool: Enable compilation of objtool for all architectures X-Git-Tag: v5.15~3783^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0decf1f8de919782b152daf9c991967a2bac54f0;p=platform%2Fkernel%2Flinux-starfive.git objtool: Enable compilation of objtool for all architectures Objtool currently only compiles for x86 architectures. This is fine as it presently does not support tooling for other architectures. However, we would like to be able to convert other kernel tools to run as objtool sub commands because they too process ELF object files. This will allow us to convert tools such as recordmcount to use objtool's ELF code. Since much of recordmcount's ELF code is copy-paste code to/from a variety of other kernel tools (look at modpost for example) this means that if we can convert recordmcount we can convert more. We define weak definitions for subcommand entry functions and other weak definitions for shared functions critical to building existing subcommands. These return 127 when the command is missing which signify tools that do not exist on all architectures. In this case the "check" and "orc" tools do not exist on all architectures so we only add them for x86. Future changes adding support for "check", to arm64 for example, can then modify the SUBCMD_CHECK variable when building for arm64. Objtool is not currently wired in to KConfig to be built for other architectures because it's not needed for those architectures and there are no commands it supports other than those for x86. As more command support is enabled on various architectures the necessary KConfig changes can be made (e.g. adding "STACK_VALIDATION") to trigger building objtool. [ jpoimboe: remove aliases, add __weak macro, add error messages ] Cc: Julien Thierry Signed-off-by: Matt Helsley Signed-off-by: Josh Poimboeuf --- diff --git a/tools/objtool/Build b/tools/objtool/Build index 66f44f5c..b7222d5 100644 --- a/tools/objtool/Build +++ b/tools/objtool/Build @@ -1,11 +1,16 @@ objtool-y += arch/$(SRCARCH)/ + +objtool-y += weak.o + +objtool-$(SUBCMD_CHECK) += check.o +objtool-$(SUBCMD_CHECK) += special.o +objtool-$(SUBCMD_ORC) += check.o +objtool-$(SUBCMD_ORC) += orc_gen.o +objtool-$(SUBCMD_ORC) += orc_dump.o + objtool-y += builtin-check.o objtool-y += builtin-orc.o -objtool-y += check.o -objtool-y += orc_gen.o -objtool-y += orc_dump.o objtool-y += elf.o -objtool-y += special.o objtool-y += objtool.o objtool-y += libstring.o diff --git a/tools/objtool/Makefile b/tools/objtool/Makefile index 6b91388..7770edc 100644 --- a/tools/objtool/Makefile +++ b/tools/objtool/Makefile @@ -46,6 +46,16 @@ elfshdr := $(shell echo '$(pound)include ' | $(CC) $(CFLAGS) -x c -E - CFLAGS += $(if $(elfshdr),,-DLIBELF_USE_DEPRECATED) AWK = awk + +SUBCMD_CHECK := n +SUBCMD_ORC := n + +ifeq ($(SRCARCH),x86) + SUBCMD_CHECK := y + SUBCMD_ORC := y +endif + +export SUBCMD_CHECK SUBCMD_ORC export srctree OUTPUT CFLAGS SRCARCH AWK include $(srctree)/tools/build/Makefile.include diff --git a/tools/objtool/arch.h b/tools/objtool/arch.h index cd118eb..eda15a5 100644 --- a/tools/objtool/arch.h +++ b/tools/objtool/arch.h @@ -8,9 +8,11 @@ #include #include -#include "elf.h" +#include "objtool.h" #include "cfi.h" +#include + enum insn_type { INSN_JUMP_CONDITIONAL, INSN_JUMP_UNCONDITIONAL, diff --git a/tools/objtool/builtin-check.c b/tools/objtool/builtin-check.c index be42b71..7a44174 100644 --- a/tools/objtool/builtin-check.c +++ b/tools/objtool/builtin-check.c @@ -16,7 +16,7 @@ #include #include #include "builtin.h" -#include "check.h" +#include "objtool.h" bool no_fp, no_unreachable, retpoline, module, backtrace, uaccess, stats, validate_dup, vmlinux; diff --git a/tools/objtool/builtin-orc.c b/tools/objtool/builtin-orc.c index 5f7cc61..b1dfe20 100644 --- a/tools/objtool/builtin-orc.c +++ b/tools/objtool/builtin-orc.c @@ -14,8 +14,7 @@ #include #include "builtin.h" -#include "check.h" - +#include "objtool.h" static const char *orc_usage[] = { "objtool orc generate [] file.o", diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 7a47ff9..63d65a7 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -7,10 +7,10 @@ #include #include "builtin.h" +#include "cfi.h" +#include "arch.h" #include "check.h" -#include "elf.h" #include "special.h" -#include "arch.h" #include "warn.h" #include diff --git a/tools/objtool/check.h b/tools/objtool/check.h index 3b59a1c..906b521 100644 --- a/tools/objtool/check.h +++ b/tools/objtool/check.h @@ -7,10 +7,8 @@ #define _CHECK_H #include -#include "objtool.h" #include "cfi.h" #include "arch.h" -#include "orc.h" struct insn_state { struct cfi_state cfi; @@ -47,8 +45,6 @@ struct instruction { struct orc_entry orc; }; -int check(const char *objname, bool orc); - struct instruction *find_insn(struct objtool_file *file, struct section *sec, unsigned long offset); diff --git a/tools/objtool/objtool.h b/tools/objtool/objtool.h index d89616b..528028a 100644 --- a/tools/objtool/objtool.h +++ b/tools/objtool/objtool.h @@ -19,4 +19,9 @@ struct objtool_file { bool ignore_unreachables, c_file, hints, rodata; }; +int check(const char *objname, bool orc); +int orc_dump(const char *objname); +int create_orc(struct objtool_file *file); +int create_orc_sections(struct objtool_file *file); + #endif /* _OBJTOOL_H */ diff --git a/tools/objtool/orc.h b/tools/objtool/orc.h deleted file mode 100644 index ee28322..0000000 --- a/tools/objtool/orc.h +++ /dev/null @@ -1,18 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ -/* - * Copyright (C) 2017 Josh Poimboeuf - */ - -#ifndef _ORC_H -#define _ORC_H - -#include - -struct objtool_file; - -int create_orc(struct objtool_file *file); -int create_orc_sections(struct objtool_file *file); - -int orc_dump(const char *objname); - -#endif /* _ORC_H */ diff --git a/tools/objtool/orc_dump.c b/tools/objtool/orc_dump.c index ba4cbb1..fca46e0 100644 --- a/tools/objtool/orc_dump.c +++ b/tools/objtool/orc_dump.c @@ -4,7 +4,8 @@ */ #include -#include "orc.h" +#include +#include "objtool.h" #include "warn.h" static const char *reg_name(unsigned int reg) diff --git a/tools/objtool/orc_gen.c b/tools/objtool/orc_gen.c index 9d2bf2d..c954998 100644 --- a/tools/objtool/orc_gen.c +++ b/tools/objtool/orc_gen.c @@ -6,7 +6,6 @@ #include #include -#include "orc.h" #include "check.h" #include "warn.h" diff --git a/tools/objtool/weak.c b/tools/objtool/weak.c new file mode 100644 index 0000000..942ea5e --- /dev/null +++ b/tools/objtool/weak.c @@ -0,0 +1,40 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2020 Matt Helsley + * Weak definitions necessary to compile objtool without + * some subcommands (e.g. check, orc). + */ + +#include +#include +#include "objtool.h" + +#define __weak __attribute__((weak)) + +#define UNSUPPORTED(name) \ +({ \ + fprintf(stderr, "error: objtool: " name " not implemented\n"); \ + return ENOSYS; \ +}) + +const char __weak *objname; + +int __weak check(const char *_objname, bool orc) +{ + UNSUPPORTED("check subcommand"); +} + +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) +{ + UNSUPPORTED("orc"); +}