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authorBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2015-04-18 22:41:46 +0200
committerBernhard Reutner-Fischer <rep.dot.nop@gmail.com>2015-04-22 20:00:24 +0200
commite71fc570caec4f2d4bbe729dfe9eb41bfe5a732a (patch)
tree3e9036c730288367ef489989e05b4452ca1116c8 /libc/sysdeps/linux
parent298f58e073b2782bd264edea969769b7b5e7cf41 (diff)
arm: Add BX and BXC macros
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux')
-rw-r--r--libc/sysdeps/linux/arm/__longjmp.S7
-rw-r--r--libc/sysdeps/linux/arm/bits/arm_bx.h12
-rw-r--r--libc/sysdeps/linux/arm/bits/uClibc_arch_features.h26
-rw-r--r--libc/sysdeps/linux/arm/clone.S6
-rw-r--r--libc/sysdeps/linux/arm/mmap64.S6
-rw-r--r--libc/sysdeps/linux/arm/syscall-eabi.S8
-rw-r--r--libc/sysdeps/linux/arm/sysdep.h14
-rw-r--r--libc/sysdeps/linux/arm/vfork.S12
8 files changed, 45 insertions, 46 deletions
diff --git a/libc/sysdeps/linux/arm/__longjmp.S b/libc/sysdeps/linux/arm/__longjmp.S
index 853b906f8..58ae8ab58 100644
--- a/libc/sysdeps/linux/arm/__longjmp.S
+++ b/libc/sysdeps/linux/arm/__longjmp.S
@@ -98,12 +98,7 @@ __longjmp:
ldcl p1, cr14, [r12], #8
ldcl p1, cr15, [r12], #8
#endif
-
-#if defined(__USE_BX__)
- bx lr
-#else
- mov pc, lr
-#endif
+ BX(lr)
#endif
.size __longjmp,.-__longjmp
diff --git a/libc/sysdeps/linux/arm/bits/arm_bx.h b/libc/sysdeps/linux/arm/bits/arm_bx.h
index 321490e55..2c290896d 100644
--- a/libc/sysdeps/linux/arm/bits/arm_bx.h
+++ b/libc/sysdeps/linux/arm/bits/arm_bx.h
@@ -24,11 +24,17 @@
#endif /* features.h not yet included */
#if defined(__USE_BX__)
-# if ( defined (__ARM_ARCH_2__) || defined (__ARM_ARCH_3__) \
- || defined (__ARM_ARCH_3M__) || defined (__ARM_ARCH_4__) \
- )
+# if (__ARM_ARCH <= 4 && !defined __ARM_ARCH_4T__)
# error Use of BX was requested, but is not available on the target processor.
# endif /* ARCH level */
#endif /* __USE_BX__ */
+#if defined(__USE_BX__) && (__ARM_ARCH > 4 || (__ARM_ARCH == 4 && defined __ARM_ARCH_4T__))
+# define BX(reg) bx reg
+# define BXC(cond, reg) bx##cond reg
+#else
+# define BX(reg) mov pc, reg
+# define BXC(cond, reg) mov##cond pc, reg
+#endif
+
#endif /* _ARM_BX_H */
diff --git a/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h b/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h
index b01d79c5c..e85aa52fe 100644
--- a/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h
+++ b/libc/sysdeps/linux/arm/bits/uClibc_arch_features.h
@@ -48,6 +48,32 @@
/* only weird assemblers generally need this */
#undef __UCLIBC_ASM_LINE_SEP__
+
+/* The __ARM_ARCH define is provided by gcc 4.8. Construct it otherwise. */
+#ifndef __ARM_ARCH
+# ifdef __ARM_ARCH_2__
+# define __ARM_ARCH 2
+# elif defined (__ARM_ARCH_3__) || defined (__ARM_ARCH_3M__)
+# define __ARM_ARCH 3
+# elif defined (__ARM_ARCH_4__) || defined (__ARM_ARCH_4T__)
+# define __ARM_ARCH 4
+# elif defined (__ARM_ARCH_5__) || defined (__ARM_ARCH_5E__) \
+ || defined(__ARM_ARCH_5T__) || defined(__ARM_ARCH_5TE__) \
+ || defined(__ARM_ARCH_5TEJ__)
+# define __ARM_ARCH 5
+# elif defined (__ARM_ARCH_6__) || defined(__ARM_ARCH_6J__) \
+ || defined (__ARM_ARCH_6Z__) || defined(__ARM_ARCH_6ZK__) \
+ || defined (__ARM_ARCH_6K__) || defined(__ARM_ARCH_6T2__)
+# define __ARM_ARCH 6
+# elif defined (__ARM_ARCH_7__) || defined(__ARM_ARCH_7A__) \
+ || defined(__ARM_ARCH_7R__) || defined(__ARM_ARCH_7M__) \
+ || defined(__ARM_ARCH_7EM__)
+# define __ARM_ARCH 7
+# else
+# error unknown arm architecture
+# endif
+#endif
+
#ifdef __GNUC__
# define __need_uClibc_config_h
# include <bits/uClibc_config.h>
diff --git a/libc/sysdeps/linux/arm/clone.S b/libc/sysdeps/linux/arm/clone.S
index 03cd10e62..63eca31c1 100644
--- a/libc/sysdeps/linux/arm/clone.S
+++ b/libc/sysdeps/linux/arm/clone.S
@@ -115,11 +115,7 @@ __clone:
ldmnefd sp!, {r4}
blt __error
IT(t, ne)
-#if defined(__USE_BX__)
- bxne lr
-#else
- movne pc, lr
-#endif
+ BXC(ne, lr)
@ pick the function arg and call address off the stack and execute
ldr r0, [sp, #4]
diff --git a/libc/sysdeps/linux/arm/mmap64.S b/libc/sysdeps/linux/arm/mmap64.S
index f4c491aac..c9f2bd2f7 100644
--- a/libc/sysdeps/linux/arm/mmap64.S
+++ b/libc/sysdeps/linux/arm/mmap64.S
@@ -92,11 +92,7 @@ mmap64:
cmn r0, $4096
ldmfd sp!, {r4, r5}
IT(t, cc)
-#if defined(__USE_BX__)
- bxcc lr
-#else
- movcc pc, lr
-#endif
+ BXC(cc, lr)
b __syscall_error
.Linval:
mov r0, $-EINVAL
diff --git a/libc/sysdeps/linux/arm/syscall-eabi.S b/libc/sysdeps/linux/arm/syscall-eabi.S
index 005cfe357..534c6e988 100644
--- a/libc/sysdeps/linux/arm/syscall-eabi.S
+++ b/libc/sysdeps/linux/arm/syscall-eabi.S
@@ -15,7 +15,7 @@
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <sys/syscall.h>
+#include <features.h>
#include <bits/arm_asm.h>
#include <bits/arm_bx.h>
@@ -62,11 +62,7 @@ syscall:
ldmfd sp!, {r4, r5, r6, r7}
cmn r0, #4096
IT(t, cc)
-#if defined(__USE_BX__)
- bxcc lr
-#else
- movcc pc, lr
-#endif
+ BXC(cc, lr)
b __syscall_error
#endif
diff --git a/libc/sysdeps/linux/arm/sysdep.h b/libc/sysdeps/linux/arm/sysdep.h
index 64f40407e..019dc3762 100644
--- a/libc/sysdeps/linux/arm/sysdep.h
+++ b/libc/sysdeps/linux/arm/sysdep.h
@@ -21,7 +21,6 @@
#include <common/sysdep.h>
#include <bits/arm_bx.h>
-
#include <sys/syscall.h>
/* For Linux we can use the system call table in the header file
/usr/include/asm/unistd.h
@@ -50,17 +49,10 @@
#ifdef __APCS_32__
#define LOADREGS(cond, base, reglist...)\
ldm##cond base,reglist
-#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 RETINSTR(cond, reg) \
+ BXC(cond, reg)
#define DO_RET(_reg) \
- mov pc, _reg
-#endif
+ BX(_reg)
#else /* APCS-26 */
#define LOADREGS(cond, base, reglist...) \
ldm##cond base,reglist^
diff --git a/libc/sysdeps/linux/arm/vfork.S b/libc/sysdeps/linux/arm/vfork.S
index 99fb6cb1f..221a90c40 100644
--- a/libc/sysdeps/linux/arm/vfork.S
+++ b/libc/sysdeps/linux/arm/vfork.S
@@ -74,11 +74,7 @@ __vfork:
RESTORE_PID
cmn r0, #4096
IT(t, cc)
-#if defined(__USE_BX__)
- bxcc lr
-#else
- movcc pc, lr
-#endif
+ BXC(cc, lr)
/* Check if vfork even exists. */
ldr r1, =-ENOSYS
@@ -92,11 +88,7 @@ __vfork:
/* Syscall worked. Return to child/parent */
IT(t, cc)
-#if defined(__USE_BX__)
- bxcc lr
-#else
- movcc pc, lr
-#endif
+ BXC(cc, lr)
__error:
b __syscall_error