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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 <jthierry@redhat.com> Signed-off-by: Matt Helsley <mhelsley@vmware.com> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
41 lines
789 B
C
41 lines
789 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2020 Matt Helsley <mhelsley@vmware.com>
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* Weak definitions necessary to compile objtool without
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* some subcommands (e.g. check, orc).
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*/
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#include <stdbool.h>
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#include <errno.h>
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#include "objtool.h"
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#define __weak __attribute__((weak))
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#define UNSUPPORTED(name) \
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({ \
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fprintf(stderr, "error: objtool: " name " not implemented\n"); \
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return ENOSYS; \
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})
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const char __weak *objname;
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int __weak check(const char *_objname, bool orc)
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{
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UNSUPPORTED("check subcommand");
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}
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int __weak orc_dump(const char *_objname)
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{
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UNSUPPORTED("orc");
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}
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int __weak create_orc(struct objtool_file *file)
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{
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UNSUPPORTED("orc");
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}
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int __weak create_orc_sections(struct objtool_file *file)
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{
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UNSUPPORTED("orc");
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}
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