svn commit: r245650 - head/lib/libc/arm
Andrew Turner
andrew at FreeBSD.org
Sat Jan 19 04:03:19 UTC 2013
Author: andrew
Date: Sat Jan 19 04:03:18 2013
New Revision: 245650
URL: http://svnweb.freebsd.org/changeset/base/245650
Log:
Update the syscall calling convention for ARM EABI. We store the syscall
in r7 and use ip to store the old version of r7 as it is not guaranteed to
be kept when calling a subroutine. The kernel will preserve the register
across system calls.
Modified:
head/lib/libc/arm/SYS.h
Modified: head/lib/libc/arm/SYS.h
==============================================================================
--- head/lib/libc/arm/SYS.h Sat Jan 19 03:47:18 2013 (r245649)
+++ head/lib/libc/arm/SYS.h Sat Jan 19 04:03:18 2013 (r245650)
@@ -39,7 +39,15 @@
#include <sys/syscall.h>
#include <machine/swi.h>
+#ifdef __ARM_EABI__
+#define SYSTRAP(x) \
+ mov ip, r7; \
+ ldr r7, =SYS_ ## x; \
+ swi 0; \
+ mov r7, ip
+#else
#define SYSTRAP(x) swi 0 | SYS_ ## x
+#endif
#define CERROR _C_LABEL(cerror)
#define CURBRK _C_LABEL(curbrk)
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