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objtool: Fix x86 orc generation on big endian cross-compiles

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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>
This commit is contained in:
Vasily Gorbik
2020-11-13 00:03:29 +01:00
committed by Josh Poimboeuf
parent a1a664ece5
commit 8bfe273238
8 changed files with 80 additions and 6 deletions
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6
tools/objtool/special.c
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@@ -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);
}