From: Martin Schwidefsky
Currently objtool seems to be the only tool from build tools needed
which breaks x86 cross compilation on big endian systems. Make the x86
instruction decoder of the objtool usable on big endian machines.
Signed-off-by: Martin Schwidefsky
Co-developed-by: Vasily Gorbik
Signed-off-by: Vasily Gorbik
---
arch/x86/include/asm/insn.h | 35 ++
arch/x86/lib/insn.c | 108 +++---
tools/arch/x86/include/asm/insn.h | 35 ++
tools/arch/x86/lib/insn.c | 108 +++---
4 files changed, 178 insertions(+), 108 deletions(-)
diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h
index 5c1ae3eff9d4..bff79b22da54 100644
--- a/arch/x86/include/asm/insn.h
+++ b/arch/x86/include/asm/insn.h
@@ -7,9 +7,12 @@
* Copyright (C) IBM Corporation, 2009
*/
+#include
/* insn_attr_t is defined in inat.h */
#include
+#if defined(__BYTE_ORDER) ? __BYTE_ORDER == __LITTLE_ENDIAN :
defined(__LITTLE_ENDIAN)
+
struct insn_field {
union {
insn_value_t value;
@@ -20,6 +23,38 @@ struct insn_field {
unsigned char nbytes;
};
+static inline void insn_field_set(struct insn_field *p, insn_value_t v,
+ unsigned char n)
+{
+ p->value = v;
+ p->nbytes = n;
+}
+
+#else
+
+struct insn_field {
+ insn_value_t value;
+ union {
+ insn_value_t little;
+ insn_byte_t bytes[4];
+ };
+ /* !0 if we've run insn_get_xxx() for this field */
+ unsigned char got;
+ unsigned char nbytes;
+};
+
+static inline void insn_field_set(struct insn_field *p, insn_value_t v,
+ unsigned char n)
+{
+ p->value = v;
+#ifndef __KERNEL__
+ p->little = __bswap_32(v);
+#endif
+ p->nbytes = n;
+}
+
+#endif
+
struct insn {
struct insn_field prefixes; /*
* Prefixes
diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c
index 404279563891..bbd4a5f15d83 100644
--- a/arch/x86/lib/insn.c
+++ b/arch/x86/lib/insn.c
@@ -5,6 +5,7 @@
* Copyright (C) IBM Corporation, 2002, 2004, 2009
*/
+#include
#ifdef __KERNEL__
#include
#else
@@ -15,15 +16,35 @@
#include
+#define leXX_to_cpu(t, r) \
+({ \
+ __typeof__(t) v;\
+ switch (sizeof(t)) {\
+ case 4: \
+ v = le32_to_cpu(r); \
+ break; \
+ case 2: \
+ v = le16_to_cpu(r); \
+ break; \
+ case 1: \
+ v = r; \
+ break; \
+ default:\
+ BUILD_BUG();\
+ break; \
+ } \
+ v; \
+})
+
/* Verify next sizeof(t) bytes can be on the same instruction */
#define validate_next(t, insn, n) \
((insn)->next_byte + sizeof(t) + n <= (insn)->end_kaddr)
#define __get_next(t, insn)\
- ({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t); r; })
+ ({ t r = *(t*)insn->next_byte; insn->next_byte += sizeof(t);
leXX_to_cpu(t, r); })
#define __peek_nbyte_next(t, insn, n) \
- ({ t r = *(t*)((insn)->next_byte + n); r; })
+ ({ t r = *(t*)((insn)->next_byte + n); leXX_to_cpu(t, r); })
#define get_next(t, insn) \
({ if (unlikely(!validate_next(t, insn, 0))) goto err_out;
__get_next(t, insn); })
@@ -157,8 +178,7 @@ void insn_get_prefixes(struct insn *insn)
b = peek_next(insn_byte_t, insn);
attr = inat_get_opcode_attribute(b);
if (inat_is_rex_prefix(attr)) {
- insn->rex_prefix.value = b;
- insn->rex_prefix.nbytes = 1;
+ insn_field_set(>rex_prefix, b, 1);
insn->next_byte++;
if (X86_REX_W(b))
/* REX.W overrides opnd_size */
@@ -295,8 +315,7 @@ void insn_get_modrm(struct insn *insn)
if (inat_has_modrm(insn->attr)) {
mod = get_next(insn_byte_t, insn);
-
