[ARM] 3109/1: old ABI compat: syscall wrappers for ABI impedance matching
Patch from Nicolas Pitre
The difference between EABI and the legacy ABI may affect either
structure member alignment and/or argument register selection.
The patch has the details.
Included are wrappers for the following syscalls:
sys_stat64
sys_lstat64
sys_fstat64
sys_fcntl64
sys_epoll_ctl
sys_epoll_wait
sys_ipc
sys_semop
sys_semtimedop
sys_pread64
sys_pwrite64
sys_truncate64
sys_ftruncate64
sys_readahead
Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index ee63ee7..59ce1bc 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -288,3 +288,35 @@
str r5, [sp, #4]
b do_mmap2
#endif
+
+#ifdef CONFIG_OABI_COMPAT
+/*
+ * These are syscalls with argument register differences
+ */
+
+sys_oabi_pread64:
+ stmia sp, {r3, r4}
+ b sys_pread64
+
+sys_oabi_pwrite64:
+ stmia sp, {r3, r4}
+ b sys_pwrite64
+
+sys_oabi_truncate64:
+ mov r3, r2
+ mov r2, r1
+ b sys_truncate64
+
+sys_oabi_ftruncate64:
+ mov r3, r2
+ mov r2, r1
+ b sys_ftruncate64
+
+sys_oabi_readahead:
+ str r3, [sp]
+ mov r3, r2
+ mov r2, r1
+ b sys_readahead
+
+#endif
+
