[PATCH v4 04/15] objtool: Fix JUMP_ENTRY_SIZE for bi-arch like powerpc
From: Christophe Leroy <hidden>
Date: 2023-07-11 16:10:38
Also in:
lkml
Subsystem:
objtool, the rest · Maintainers:
Josh Poimboeuf, Peter Zijlstra, Linus Torvalds
struct jump_entry {
s32 code;
s32 target;
long key;
};
It means that the size of the third argument depends on
whether we are building a 32 bits or 64 bits kernel.
Therefore JUMP_ENTRY_SIZE must depend on elf_class_addrsize(elf).
To allow that, entries[] table must be initialised at runtime. This is
easily done by moving it into its only user which is special_get_alts().
Signed-off-by: Christophe Leroy <redacted>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
.../arch/powerpc/include/arch/special.h | 2 +-
tools/objtool/special.c | 55 +++++++++----------
2 files changed, 28 insertions(+), 29 deletions(-)
diff --git a/tools/objtool/arch/powerpc/include/arch/special.h b/tools/objtool/arch/powerpc/include/arch/special.h
index ffef9ada7133..b17802dcf436 100644
--- a/tools/objtool/arch/powerpc/include/arch/special.h
+++ b/tools/objtool/arch/powerpc/include/arch/special.h@@ -6,7 +6,7 @@ #define EX_ORIG_OFFSET 0 #define EX_NEW_OFFSET 4 -#define JUMP_ENTRY_SIZE 16 +#define JUMP_ENTRY_SIZE (8 + elf_addr_size(elf)) /* 12 on PPC32, 16 on PPC64 */ #define JUMP_ORIG_OFFSET 0 #define JUMP_NEW_OFFSET 4 #define JUMP_KEY_OFFSET 8
diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index 91b1950f5bd8..b3f07e8beb85 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c@@ -26,34 +26,6 @@ struct special_entry { unsigned char key; /* jump_label key */ }; -static const struct special_entry entries[] = { - { - .sec = ".altinstructions", - .group = true, - .size = ALT_ENTRY_SIZE, - .orig = ALT_ORIG_OFFSET, - .orig_len = ALT_ORIG_LEN_OFFSET, - .new = ALT_NEW_OFFSET, - .new_len = ALT_NEW_LEN_OFFSET, - .feature = ALT_FEATURE_OFFSET, - }, - { - .sec = "__jump_table", - .jump_or_nop = true, - .size = JUMP_ENTRY_SIZE, - .orig = JUMP_ORIG_OFFSET, - .new = JUMP_NEW_OFFSET, - .key = JUMP_KEY_OFFSET, - }, - { - .sec = "__ex_table", - .size = EX_ENTRY_SIZE, - .orig = EX_ORIG_OFFSET, - .new = EX_NEW_OFFSET, - }, - {}, -}; - void __weak arch_handle_alternative(unsigned short feature, struct special_alt *alt) { }
@@ -144,6 +116,33 @@ int special_get_alts(struct elf *elf, struct list_head *alts) unsigned int nr_entries; struct special_alt *alt; int idx, ret; + const struct special_entry entries[] = { + { + .sec = ".altinstructions", + .group = true, + .size = ALT_ENTRY_SIZE, + .orig = ALT_ORIG_OFFSET, + .orig_len = ALT_ORIG_LEN_OFFSET, + .new = ALT_NEW_OFFSET, + .new_len = ALT_NEW_LEN_OFFSET, + .feature = ALT_FEATURE_OFFSET, + }, + { + .sec = "__jump_table", + .jump_or_nop = true, + .size = JUMP_ENTRY_SIZE, + .orig = JUMP_ORIG_OFFSET, + .new = JUMP_NEW_OFFSET, + .key = JUMP_KEY_OFFSET, + }, + { + .sec = "__ex_table", + .size = EX_ENTRY_SIZE, + .orig = EX_ORIG_OFFSET, + .new = EX_NEW_OFFSET, + }, + {}, + }; INIT_LIST_HEAD(alts);
--
2.41.0