From 577e4aa1ec5462ead3af4ba2236881ed4672f01e Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Sat, 4 Dec 2004 21:20:42 +0000
Subject: * sysdeps/arm/sysdep.h: Define __USE_BX__ if bx is available.

	Use it instead of __THUMB_INTERWORK__.  Make RETINSTR take
	only a condition and a register.
	* sysdeps/arm/dl-machine.h: Use __USE_BX__ instead of
	__THUMB_INTERWORK__.
	(_dl_start_user): Use BX.
	* sysdeps/arm/strlen.S: Use DO_RET.
	* sysdeps/unix/arm/brk.S, sysdeps/unix/arm/fork.S,
	sysdeps/unix/arm/sysdep.S, sysdeps/unix/arm/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/arm/clone.S,
	sysdeps/unix/sysv/linux/arm/mmap.S,
	sysdeps/unix/sysv/linux/arm/mmap64.S,
	sysdeps/unix/sysv/linux/arm/socket.S,
	sysdeps/unix/sysv/linux/arm/sysdep.h,
	sysdeps/unix/sysv/linux/arm/vfork.S: Update uses of RETINSTR.
---
 sysdeps/arm/dl-machine.h |  4 ++--
 sysdeps/arm/strlen.S     |  2 +-
 sysdeps/arm/sysdep.h     | 17 ++++++++++++-----
 3 files changed, 15 insertions(+), 8 deletions(-)

(limited to 'sysdeps/arm')

diff --git a/sysdeps/arm/dl-machine.h b/sysdeps/arm/dl-machine.h
index 5dfe3346f5..761f8daeaa 100644
--- a/sysdeps/arm/dl-machine.h
+++ b/sysdeps/arm/dl-machine.h
@@ -123,7 +123,7 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
   return lazy;
 }
 
-#if defined(__THUMB_INTERWORK__)
+#if defined(__USE_BX__)
 #define BX(x) "bx\t" #x
 #else
 #define BX(x) "mov\tpc, " #x
@@ -293,7 +293,7 @@ _dl_start_user:\n\
 	ldr	r0, .L_FINI_PROC\n\
 	add	r0, sl, r0\n\
 	@ jump to the user_s entry point\n\
-	mov	pc, r6\n\
+	" BX(r6) "\n\
 .L_GET_GOT:\n\
 	.word	_GLOBAL_OFFSET_TABLE_ - .L_GOT_GOT - 4\n\
 .L_SKIP_ARGS:\n\
diff --git a/sysdeps/arm/strlen.S b/sysdeps/arm/strlen.S
index a83c41d26a..86e16652e4 100644
--- a/sysdeps/arm/strlen.S
+++ b/sysdeps/arm/strlen.S
@@ -68,6 +68,6 @@ Llastword:				@ drop through to here once we find a
 	tstne   r2, $0x00ff0000         @ (if first three all non-zero, 4th
 	addne   r0, r0, $1              @  must be zero)
 #endif
-	RETINSTR(mov,pc,lr)
+	DO_RET(lr)
 END(strlen)
 libc_hidden_builtin_def (strlen)
diff --git a/sysdeps/arm/sysdep.h b/sysdeps/arm/sysdep.h
index cb3f105afe..8ca77a60cb 100644
--- a/sysdeps/arm/sysdep.h
+++ b/sysdeps/arm/sysdep.h
@@ -19,6 +19,11 @@
 
 #include <sysdeps/generic/sysdep.h>
 
+#if (!defined (__ARM_ARCH_2__) && !defined (__ARM_ARCH_3__) \
+     && !defined (__ARM_ARCH_3M__) && !defined (__ARM_ARCH_4__))
+# define __USE_BX__
+#endif
+
 #ifdef	__ASSEMBLER__
 
 /* Syntactic details of assembler.  */
@@ -50,20 +55,22 @@
 #ifdef __APCS_32__
 #define LOADREGS(cond, base, reglist...)\
 	ldm##cond	base,reglist
-#define RETINSTR(instr, regs...)\
-	instr	regs
-#ifdef __THUMB_INTERWORK__
+#ifdef __USE_BX__
+#define RETINSTR(cond, reg)	\
+	bx##cond	reg
 #define DO_RET(_reg)		\
 	bx _reg
 #else
+#define RETINSTR(cond, reg)	\
+	mov##cond	pc, reg
 #define DO_RET(_reg)		\
 	mov pc, _reg
 #endif
 #else  /* APCS-26 */
 #define LOADREGS(cond, base, reglist...)\
 	ldm##cond	base,reglist^
-#define RETINSTR(instr, regs...)\
-	instr##s	regs
+#define RETINSTR(cond, reg)	\
+	mov##cond##s	pc, reg
 #define DO_RET(_reg)		\
 	movs pc, _reg
 #endif
-- 
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