Add syscalls.h for ARM

1 files changed, 119 insertions, 0 deletions

diff --git a/libc/sysdeps/linux/arm/bits/syscalls.h b/libc/sysdeps/linux/arm/bits/syscalls.h
new file mode 100644
index 000000000..42b20ffea
--- /dev/null
+++ b/libc/sysdeps/linux/arm/bits/syscalls.h
@@ -0,0 +1,119 @@
+/* Unlike the asm/unistd.h kernel header file (which this is partly based on),
+ * this file must be able to cope with PIC and non-PIC code.  For some arches
+ * there is no difference.  For x86 (which has far too few registers) there is
+ * a difference.   Regardless, including asm/unistd.h is hereby officially
+ * forbidden.  Don't do it.  It is bad for you.  */
+
+#include <features.h>
+
+// TODO -- Add support for __UCLIBC_USE_UNIFIED_SYSCALL__
+
+
+#define __sys2(x) #x
+#define __sys1(x) __sys2(x)
+
+#ifndef __syscall
+#define __syscall(name) "swi\t" __sys1(__NR_##name) "\n\t"
+#endif
+
+#define __syscall_return(type, res)					\
+do {									\
+	if ((unsigned long)(res) >= (unsigned long)(-125)) {		\
+		errno = -(res);						\
+		res = -1;						\
+	}								\
+	return (type) (res);						\
+} while (0)
+
+
+#define _syscall0(type,name)						\
+type name(void) {							\
+  long __res;								\
+  __asm__ __volatile__ (						\
+  __syscall(name)							\
+  "mov %0,r0"								\
+  :"=r" (__res) : : "r0","lr");						\
+  __syscall_return(type,__res);						\
+}
+
+#define _syscall1(type,name,type1,arg1)					\
+type name(type1 arg1) {							\
+  long __res;								\
+  __asm__ __volatile__ (						\
+  "mov\tr0,%1\n\t"							\
+  __syscall(name)							\
+  "mov %0,r0"								\
+        : "=r" (__res)							\
+        : "r" ((long)(arg1))						\
+	: "r0","lr");							\
+  __syscall_return(type,__res);						\
+}
+
+#define _syscall2(type,name,type1,arg1,type2,arg2)			\
+type name(type1 arg1,type2 arg2) {					\
+  long __res;								\
+  __asm__ __volatile__ (						\
+  "mov\tr0,%1\n\t"							\
+  "mov\tr1,%2\n\t"							\
+  __syscall(name)							\
+  "mov\t%0,r0"								\
+        : "=r" (__res)							\
+        : "r" ((long)(arg1)),"r" ((long)(arg2))				\
+	: "r0","r1","lr");						\
+  __syscall_return(type,__res);						\
+}
+
+
+#define _syscall3(type,name,type1,arg1,type2,arg2,type3,arg3)		\
+type name(type1 arg1,type2 arg2,type3 arg3) {				\
+  long __res;								\
+  __asm__ __volatile__ (						\
+  "mov\tr0,%1\n\t"							\
+  "mov\tr1,%2\n\t"							\
+  "mov\tr2,%3\n\t"							\
+  __syscall(name)							\
+  "mov\t%0,r0"								\
+        : "=r" (__res)							\
+        : "r" ((long)(arg1)),"r" ((long)(arg2)),"r" ((long)(arg3))	\
+        : "r0","r1","r2","lr");						\
+  __syscall_return(type,__res);						\
+}
+
+#undef _syscall4
+#define _syscall4(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4)\
+type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4) {		\
+  long __res;								\
+  __asm__ __volatile__ (						\
+  "mov\tr0,%1\n\t"							\
+  "mov\tr1,%2\n\t"							\
+  "mov\tr2,%3\n\t"							\
+  "mov\tr3,%4\n\t"							\
+  __syscall(name)							\
+  "mov\t%0,r0"								\
+  	: "=r" (__res)							\
+  	: "r" ((long)(arg1)),"r" ((long)(arg2)),                        \
+	  "r" ((long)(arg3)),"r" ((long)(arg4))	                        \
+  	: "r0","r1","r2","r3","lr");					\
+  __syscall_return(type,__res);						\
+}
+
+#undef _syscall5
+#define _syscall5(type,name,type1,arg1,type2,arg2,type3,arg3,type4,arg4,type5,arg5)\
+type name(type1 arg1, type2 arg2, type3 arg3, type4 arg4, type5 arg5) {		\
+  long __res;								\
+  __asm__ __volatile__ (						\
+  "mov\tr0,%1\n\t"							\
+  "mov\tr1,%2\n\t"							\
+  "mov\tr2,%3\n\t"							\
+  "mov\tr3,%4\n\t"							\
+  "mov\tr4,%5\n\t"							\
+  __syscall(name)							\
+  "mov\t%0,r0"								\
+  	: "=r" (__res)							\
+  	: "r" ((long)(arg1)),"r" ((long)(arg2)),                        \
+	  "r" ((long)(arg3)),"r" ((long)(arg4)),                        \
+	  "r" ((long)(arg5))                   	                        \
+  	: "r0","r1","r2","r3","r4","lr");				\
+  __syscall_return(type,__res);						\
+}
+