From: Josh Poimboeuf <jpoimboe@redhat.com>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org,
Peter Zijlstra <peterz@infradead.org>,
Sami Tolvanen <samitolvanen@google.com>,
Sedat Dilek <sedat.dilek@gmail.com>,
Kees Cook <keescook@chromium.org>,
Nick Desaulniers <ndesaulniers@google.com>,
clang-built-linux@googlegroups.com,
Miroslav Benes <mbenes@suse.cz>
Subject: [PATCH v2 10/20] objtool: Move unsuffixed symbol conversion to a helper function
Date: Thu, 21 Jan 2021 15:29:26 -0600 [thread overview]
Message-ID: <693bc87431d1fb498e93a43ea2640e4512c39144.1611263462.git.jpoimboe@redhat.com> (raw)
In-Reply-To: <cover.1611263461.git.jpoimboe@redhat.com>
This logic will also be needed for the CONFIG_CFI_CLANG support.
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
tools/objtool/elf.c | 60 ++++++++++++++++++++++++++++-----------------
1 file changed, 37 insertions(+), 23 deletions(-)
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index 43714ecd09f7..e7d9c29fe78c 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -262,6 +262,38 @@ struct reloc *find_reloc_by_dest(const struct elf *elf, struct section *sec, uns
return find_reloc_by_dest_range(elf, sec, offset, 1);
}
+static int find_unsuffixed_func(const struct elf *elf, struct symbol *sym,
+ const char *suffix, struct symbol **func)
+{
+ char name[MAX_NAME_LEN + 1];
+ const char *loc;
+ size_t len;
+
+ *func = NULL;
+
+ loc = strstr(sym->name, suffix);
+ if (!loc)
+ return 0;
+
+ len = loc - sym->name;
+ if (len > MAX_NAME_LEN) {
+ WARN("%s(): unsuffixed function name exceeds maximum length of %d characters",
+ sym->name, MAX_NAME_LEN);
+ return -1;
+ }
+
+ strncpy(name, sym->name, len);
+ name[len] = '\0';
+
+ *func = find_symbol_by_name(elf, name);
+ if (!*func || (*func)->type != STT_FUNC) {
+ WARN("%s(): can't find unsuffixed function", sym->name);
+ return -1;
+ }
+
+ return 0;
+}
+
void insn_to_reloc_sym_addend(struct section *sec, unsigned long offset,
struct reloc *reloc)
{
@@ -374,7 +406,6 @@ static int read_symbols(struct elf *elf)
struct list_head *entry;
struct rb_node *pnode;
int symbols_nr, i;
- char *coldstr;
Elf_Data *shndx_data = NULL;
Elf32_Word shndx;
@@ -456,37 +487,20 @@ static int read_symbols(struct elf *elf)
/* Create parent/child links for any cold subfunctions */
list_for_each_entry(sec, &elf->sections, list) {
list_for_each_entry(sym, &sec->symbol_list, list) {
- char pname[MAX_NAME_LEN + 1];
- size_t pnamelen;
if (sym->type != STT_FUNC)
continue;
- if (sym->pfunc == NULL)
+ if (!sym->pfunc)
sym->pfunc = sym;
- if (sym->cfunc == NULL)
+ if (!sym->cfunc)
sym->cfunc = sym;
- coldstr = strstr(sym->name, ".cold");
- if (!coldstr)
- continue;
-
- pnamelen = coldstr - sym->name;
- if (pnamelen > MAX_NAME_LEN) {
- WARN("%s(): parent function name exceeds maximum length of %d characters",
- sym->name, MAX_NAME_LEN);
+ if (find_unsuffixed_func(elf, sym, ".cold", &pfunc))
return -1;
- }
- strncpy(pname, sym->name, pnamelen);
- pname[pnamelen] = '\0';
- pfunc = find_symbol_by_name(elf, pname);
-
- if (!pfunc) {
- WARN("%s(): can't find parent function",
- sym->name);
- return -1;
- }
+ if (!pfunc)
+ continue;
sym->pfunc = pfunc;
pfunc->cfunc = sym;
--
2.29.2
next prev parent reply other threads:[~2021-01-21 21:37 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-21 21:29 [PATCH v2 00/20] objtool: vmlinux.o and CLANG LTO support Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 01/20] objtool: Fix error handling for STD/CLD warnings Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 02/20] objtool: Fix retpoline detection in asm code Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 03/20] objtool: Fix ".cold" section suffix check for newer versions of GCC Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 04/20] objtool: Support retpoline jump detection for vmlinux.o Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 05/20] x86/ftrace: Add UNWIND_HINT_FUNC annotation for ftrace_stub Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 06/20] objtool: Assume only ELF functions do sibling calls Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 07/20] objtool: Add asm version of STACK_FRAME_NON_STANDARD Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 08/20] objtool: Combine UNWIND_HINT_RET_OFFSET and UNWIND_HINT_FUNC Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 09/20] objtool: Add xen_start_kernel() to noreturn list Josh Poimboeuf
2021-01-21 21:29 ` Josh Poimboeuf [this message]
2021-01-21 21:29 ` [PATCH v2 11/20] objtool: Add CONFIG_CFI_CLANG support Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 12/20] x86/xen: Support objtool validation in xen-asm.S Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 13/20] x86/xen: Support objtool vmlinux.o validation in xen-head.S Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 14/20] x86/xen/pvh: Annotate indirect branch as safe Josh Poimboeuf
2021-01-22 5:17 ` Jürgen Groß
2021-01-21 21:29 ` [PATCH v2 15/20] x86/ftrace: Support objtool vmlinux.o validation in ftrace_64.S Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 16/20] x86/acpi: Annotate indirect branch as safe Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 17/20] x86/acpi: Support objtool validation in wakeup_64.S Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 18/20] x86/power: Annotate indirect branches as safe Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 19/20] x86/power: Move restore_registers() to top of the file Josh Poimboeuf
2021-01-21 21:29 ` [PATCH v2 20/20] x86/power: Support objtool validation in hibernate_asm_64.S Josh Poimboeuf
2021-01-21 22:38 ` [PATCH v2 00/20] objtool: vmlinux.o and CLANG LTO support Sedat Dilek
2021-01-22 15:41 ` Josh Poimboeuf
2021-01-22 21:17 ` Sami Tolvanen
2021-01-23 1:32 ` Nick Desaulniers
2021-01-23 2:26 ` Josh Poimboeuf
2021-01-23 2:31 ` Sedat Dilek
2021-01-23 2:46 ` Josh Poimboeuf
2021-01-23 2:50 ` Sedat Dilek
2021-01-25 22:43 ` Sami Tolvanen
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