[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>

1 files changed, 32 insertions, 0 deletions

diff --git a/arch/arm/kernel/entry-common.S b/arch/arm/kernel/entry-common.S
index ee63ee78d84f..59ce1bcec42b 100644
--- a/arch/arm/kernel/entry-common.S
+++ b/arch/arm/kernel/entry-common.S
@@ -288,3 +288,35 @@ sys_mmap2:
                 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
+