arm: Add BX and BXC macros

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

5 files changed, 9 insertions, 47 deletions

diff --git a/libc/string/arm/_memcpy.S b/libc/string/arm/_memcpy.S
index c59f5b808..2999e8ee6 100644
--- a/libc/string/arm/_memcpy.S
+++ b/libc/string/arm/_memcpy.S
@@ -111,11 +111,7 @@ _memcpy:
 	bcc	.Lmemcpy_backwards
 
 	IT(t, eq)			/* Quick abort for src=dst */
-#if defined(__USE_BX__)
-        bxeq    lr
-#else
-        moveq   pc, lr
-#endif
+	BXC(eq, lr)
 	stmdb	sp!, {r0, lr}		/* memcpy() returns dest addr */
 	subs	r2, r2, #4
 	blt	.Lmemcpy_fl4		/* less than 4 bytes */
@@ -455,11 +451,7 @@ _memcpy:
 	/* less than 4 bytes to go */
 	adds	r2, r2, #4
 	IT(t, eq)
-#if defined(__USE_BX__)
-        bxeq    lr
-#else
-	moveq	pc, lr			/* done */
-#endif
+	BXC(eq, lr)			/* done */
 	/* copy the crud byte at a time */
 	cmp	r2, #2
 	ldrb	r3, [r1, #-1]!
@@ -477,11 +469,7 @@ _memcpy:
 	ldrgtb	r3, [r1, #-1]!
 	strgtb	r3, [r0, #-1]!
 #endif
-#if defined(__USE_BX__)
-        bx      lr
-#else
-	mov	pc, lr
-#endif
+	BX(lr)
 	/* erg - unaligned destination */
 .Lmemcpy_bdestul:
 	cmp	r12, #2
diff --git a/libc/string/arm/memcmp.S b/libc/string/arm/memcmp.S
index 9f7841559..5b9473cd0 100644
--- a/libc/string/arm/memcmp.S
+++ b/libc/string/arm/memcmp.S
@@ -67,11 +67,7 @@ memcmp:
 	subs	r2, r2, #1
 	IT(tt, mi)
 	movmi	r0, #0
-#if defined(__USE_BX__)
-        bxmi    lr
-#else
-	movmi	pc, lr
-#endif
+	BXC(mi, lr)
 	/* ip == last src address to compare */
 	add	ip, r0, r2
 1:
@@ -82,11 +78,7 @@ memcmp:
 	cmpcs	r2, r3
 	beq	1b
 	sub	r0, r2, r3
-#if defined(__USE_BX__)
-        bx      lr
-#else
- 	mov	pc, lr
-#endif
+	BX(lr)
 #endif
 
 .size memcmp,.-memcmp
diff --git a/libc/string/arm/memset.S b/libc/string/arm/memset.S
index 8ddc47eb1..2be4850e4 100644
--- a/libc/string/arm/memset.S
+++ b/libc/string/arm/memset.S
@@ -17,7 +17,6 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <features.h>
-#include <sys/syscall.h>
 #include <bits/arm_asm.h>
 #include <bits/arm_bx.h>
 
@@ -109,11 +108,7 @@ memset:
 2:
 	movs	a3, a3		@ anything left?
 	IT(t, eq)
-#if defined(__USE_BX__)
-        bxeq    lr
-#else
-        moveq	pc, lr		@ nope
-#endif
+	BXC(eq, lr)			@ nope
 #if defined (__thumb2__)
 1:
 	strb	a2, [a4], #1
@@ -131,11 +126,7 @@ memset:
 	strb	a2, [a4], $1
 	strb	a2, [a4], $1
 	strb	a2, [a4], $1
-#if defined(__USE_BX__)
-        bx      lr
-#else
- 	mov	pc, lr
-#endif
+	BX(lr)
 #endif
 #endif
 
diff --git a/libc/string/arm/strcmp.S b/libc/string/arm/strcmp.S
index 8b77ab0f1..81416a9a5 100644
--- a/libc/string/arm/strcmp.S
+++ b/libc/string/arm/strcmp.S
@@ -63,11 +63,7 @@ strcmp:
 	cmpcs	r2, r3
 	beq	1b
 	sub	r0, r2, r3
-#if defined(__USE_BX__)
-        bx      lr
-#else
-  	mov	pc, lr
-#endif
+	BX(lr)
 #endif
 
 .size strcmp,.-strcmp
diff --git a/libc/string/arm/strlen.S b/libc/string/arm/strlen.S
index 0e7737e23..9995d768c 100644
--- a/libc/string/arm/strlen.S
+++ b/libc/string/arm/strlen.S
@@ -18,7 +18,6 @@
 
 #include <features.h>
 #include <endian.h>
-#include <sys/syscall.h>
 #include <bits/arm_asm.h>
 #include <bits/arm_bx.h>
 
@@ -99,11 +98,7 @@ Llastword:				@ drop through to here once we find a
 	IT(t, ne)
 	addne   r0, r0, $1              @  must be zero)
 #endif
-#if defined(__USE_BX__)
-        bx      lr
-#else
-  	mov	pc,lr
-#endif
+	BX(lr)
 #endif
 
 .size strlen,.-strlen