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authorVasily Gorbik <gor@linux.ibm.com>2020-11-13 00:03:29 +0100
committerJosh Poimboeuf <jpoimboe@redhat.com>2021-01-13 18:13:13 -0600
commit8bfe273238d77d3cee18e4c03b2f26ae360b5661 (patch)
treecd0313607796a23f9adf6f5f60a441f84ffc69dd /tools/objtool/special.c
parenta1a664ece586457e9f7652b0bc5b08386259e358 (diff)
objtool: Fix x86 orc generation on big endian cross-compiles
Correct objtool orc generation endianness problems to enable fully functional x86 cross-compiles on big endian hardware. Introduce bswap_if_needed() macro, which does a byte swap if target endianness doesn't match the host, i.e. cross-compilation for little endian on big endian and vice versa. The macro is used for conversion of multi-byte values which are read from / about to be written to a target native endianness ELF file. Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Masami Hiramatsu <mhiramat@kernel.org> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Diffstat (limited to 'tools/objtool/special.c')
-rw-r--r--tools/objtool/special.c6
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/objtool/special.c b/tools/objtool/special.c
index 1a2420febd08..ab7cb1e13411 100644
--- a/tools/objtool/special.c
+++ b/tools/objtool/special.c
@@ -15,6 +15,7 @@
#include "special.h"
#include "warn.h"
#include "arch_special.h"
+#include "endianness.h"
struct special_entry {
const char *sec;
@@ -77,8 +78,9 @@ static int get_alt_entry(struct elf *elf, struct special_entry *entry,
if (entry->feature) {
unsigned short feature;
- feature = *(unsigned short *)(sec->data->d_buf + offset +
- entry->feature);
+ feature = bswap_if_needed(*(unsigned short *)(sec->data->d_buf +
+ offset +
+ entry->feature));
arch_handle_alternative(feature, alt);
}