update syscalls with off_t arguments to handle argument alignment, if needed

the arm syscall abi requires 64-bit arguments to be aligned on an even
register boundary. these new macros facilitate meeting the abi
requirement without imposing significant ugliness on the code.

arch/arm/bits/syscall.h

@@ -1,6 +1,7 @@
-#define __SYSCALL_LL(x) \
+#define __SYSCALL_LL_E(x) \
 ((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
+#define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
 long (__syscall)(long, ...);
 

arch/i386/bits/syscall.h

@@ -1,6 +1,7 @@
-#define __SYSCALL_LL(x) \
+#define __SYSCALL_LL_E(x) \
 ((union { long long ll; long l[2]; }){ .ll = x }).l[0], \
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
+#define __SYSCALL_LL_O(x) __SYSCALL_LL_E((x))
 
 static inline long __syscall0(long __n)
 {

arch/x86_64/bits/syscall.h

@@ -1,4 +1,5 @@
-#define __SYSCALL_LL(x) (x)
+#define __SYSCALL_LL_E(x) (x)
+#define __SYSCALL_LL_O(x) (x)
 
 static inline long __syscall0(long __n)
 {

src/fcntl/posix_fadvise.c

@@ -3,6 +3,6 @@
 
 int posix_fadvise(int fd, off_t base, off_t len, int advice)
 {
-	return -__syscall(SYS_fadvise, fd, __SYSCALL_LL(base),
-		__SYSCALL_LL(len), advice);
+	return -(__syscall)(SYS_fadvise, fd, __SYSCALL_LL_O(base),
+		__SYSCALL_LL_E(len), advice);
 }

src/fcntl/posix_fallocate.c

@@ -3,6 +3,6 @@
 
 int posix_fallocate(int fd, off_t base, off_t len)
 {
-	return -__syscall(SYS_fallocate, fd, __SYSCALL_LL(base),
-		__SYSCALL_LL(len));
+	return -__syscall(SYS_fallocate, fd, __SYSCALL_LL_O(base),
+		__SYSCALL_LL_E(len));
 }

src/unistd/ftruncate.c

@@ -4,7 +4,7 @@
 
 int ftruncate(int fd, off_t length)
 {
-	return syscall(SYS_ftruncate, fd, __SYSCALL_LL(length));
+	return syscall(SYS_ftruncate, fd, __SYSCALL_LL_O(length));
 }
 
 LFS64(ftruncate);

src/unistd/pread.c

@@ -4,7 +4,7 @@
 
 ssize_t pread(int fd, void *buf, size_t size, off_t ofs)
 {
-	return syscall_cp(SYS_pread, fd, buf, size, __SYSCALL_LL(ofs));
+	return syscall_cp(SYS_pread, fd, buf, size, __SYSCALL_LL_O(ofs));
 }
 
 LFS64(pread);

src/unistd/pwrite.c

@@ -4,7 +4,7 @@
 
 ssize_t pwrite(int fd, const void *buf, size_t size, off_t ofs)
 {
-	return syscall_cp(SYS_pwrite, fd, buf, size, __SYSCALL_LL(ofs));
+	return syscall_cp(SYS_pwrite, fd, buf, size, __SYSCALL_LL_O(ofs));
 }
 
 LFS64(pwrite);

src/unistd/truncate.c

@@ -4,7 +4,7 @@
 
 int truncate(const char *path, off_t length)
 {
-	return syscall(SYS_truncate, path, __SYSCALL_LL(length));
+	return syscall(SYS_truncate, path, __SYSCALL_LL_O(length));
 }
 
 LFS64(truncate);