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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-09-17 09:03:58 -0700 |
|---|---|---|
| committer | Josh Poimboeuf <jpoimboe@kernel.org> | 2025-10-14 14:50:18 -0700 |
| commit | a3493b33384a01a1f0e38b420d1a4766aec903a6 (patch) | |
| tree | ba6afc1289615358ad7c7d080e5bf0b99dc34e2b /tools/objtool/include | |
| parent | 0d83da43b1e1c8ce19f2bb10f54a0fdf795364f7 (diff) | |
| download | linux-a3493b33384a01a1f0e38b420d1a4766aec903a6.tar.gz linux-a3493b33384a01a1f0e38b420d1a4766aec903a6.tar.bz2 linux-a3493b33384a01a1f0e38b420d1a4766aec903a6.zip | |
objtool/klp: Add --debug-checksum=<funcs> to show per-instruction checksums
Add a --debug-checksum=<funcs> option to the check subcommand to print
the calculated checksum of each instruction in the given functions.
This is useful for determining where two versions of a function begin to
diverge.
Acked-by: Petr Mladek <pmladek@suse.com>
Tested-by: Joe Lawrence <joe.lawrence@redhat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Diffstat (limited to 'tools/objtool/include')
| -rw-r--r-- | tools/objtool/include/objtool/builtin.h | 1 | ||||
| -rw-r--r-- | tools/objtool/include/objtool/checksum.h | 1 | ||||
| -rw-r--r-- | tools/objtool/include/objtool/elf.h | 1 | ||||
| -rw-r--r-- | tools/objtool/include/objtool/warn.h | 19 |
4 files changed, 22 insertions, 0 deletions
diff --git a/tools/objtool/include/objtool/builtin.h b/tools/objtool/include/objtool/builtin.h index 338bdab6b9ad..cee9fc031877 100644 --- a/tools/objtool/include/objtool/builtin.h +++ b/tools/objtool/include/objtool/builtin.h @@ -32,6 +32,7 @@ struct opts { /* options: */ bool backtrace; bool backup; + const char *debug_checksum; bool dryrun; bool link; bool mnop; diff --git a/tools/objtool/include/objtool/checksum.h b/tools/objtool/include/objtool/checksum.h index 927ca74b5c39..7fe21608722a 100644 --- a/tools/objtool/include/objtool/checksum.h +++ b/tools/objtool/include/objtool/checksum.h @@ -19,6 +19,7 @@ static inline void checksum_update(struct symbol *func, const void *data, size_t size) { XXH3_64bits_update(func->csum.state, data, size); + dbg_checksum(func, insn, XXH3_64bits_digest(func->csum.state)); } static inline void checksum_finish(struct symbol *func) diff --git a/tools/objtool/include/objtool/elf.h b/tools/objtool/include/objtool/elf.h index bc7d8a6167f8..a1f1762f89c4 100644 --- a/tools/objtool/include/objtool/elf.h +++ b/tools/objtool/include/objtool/elf.h @@ -82,6 +82,7 @@ struct symbol { u8 nocfi : 1; u8 cold : 1; u8 prefix : 1; + u8 debug_checksum : 1; struct list_head pv_target; struct reloc *relocs; struct section *group_sec; diff --git a/tools/objtool/include/objtool/warn.h b/tools/objtool/include/objtool/warn.h index cb8fe846d9dd..29173a1368d7 100644 --- a/tools/objtool/include/objtool/warn.h +++ b/tools/objtool/include/objtool/warn.h @@ -102,4 +102,23 @@ static inline char *offstr(struct section *sec, unsigned long offset) #define ERROR_FUNC(sec, offset, format, ...) __WARN_FUNC(ERROR_STR, sec, offset, format, ##__VA_ARGS__) #define ERROR_INSN(insn, format, ...) WARN_FUNC(insn->sec, insn->offset, format, ##__VA_ARGS__) + +#define __dbg(format, ...) \ + fprintf(stderr, \ + "DEBUG: %s%s" format "\n", \ + objname ?: "", \ + objname ? ": " : "", \ + ##__VA_ARGS__) + +#define dbg_checksum(func, insn, checksum) \ +({ \ + if (unlikely(insn->sym && insn->sym->pfunc && \ + insn->sym->pfunc->debug_checksum)) { \ + char *insn_off = offstr(insn->sec, insn->offset); \ + __dbg("checksum: %s %s %016lx", \ + func->name, insn_off, checksum); \ + free(insn_off); \ + } \ +}) + #endif /* _WARN_H */ |