commit 9aceab50155b17741faded1fb22e2daa51a07fb1
author Elliott Hughes <enh@google.com> Tue Mar 12 14:57:30 2013 -0700
committer Elliott Hughes <enh@google.com> Tue Mar 12 17:43:58 2013 -0700
tree d1a976cb41c6aa807c6b07f0e858f92ea5763b4f
parent 94a34010c1f989032c0a4dc7a7a68d069ca23b1e

Use the kernel's MAX_ERRNO in the syscall stubs.

Bug: http://code.google.com/p/android/issues/detail?id=53104
Change-Id: Iaabf7025b153e96dc5eca231a33a32d4cb7d8116

libc/arch-arm/bionic/syscall.S

diff --git a/libc/arch-arm/bionic/syscall.S b/libc/arch-arm/bionic/syscall.S
index 69f3bec..be9591e 100644
--- a/libc/arch-arm/bionic/syscall.S
+++ b/libc/arch-arm/bionic/syscall.S
@@ -26,6 +26,7 @@
  * SUCH DAMAGE.
  */
 
+#include <linux/err.h>
 #include <machine/asm.h>
 #include <sys/linux-syscalls.h>
 
@@ -39,7 +40,8 @@
     ldmfd   ip, {r3, r4, r5, r6}
     swi     #0
     ldmfd   sp!, {r4, r5, r6, r7}
-    movs    r0, r0
-    bxpl    lr
-    b       __set_syscall_errno
+    cmn     r0, #(MAX_ERRNO + 1)
+    bxls    lr
+    neg     r0, r0
+    b       __set_errno
 END(syscall)