[MIPS] Check error status from pipe system call
Change-Id: Iaaea0e826c2678aa7f6fad9d46b16302a4d3b876
diff --git a/libc/arch-mips/bionic/pipe.S b/libc/arch-mips/bionic/pipe.S
index 8556569..0baf246 100644
--- a/libc/arch-mips/bionic/pipe.S
+++ b/libc/arch-mips/bionic/pipe.S
@@ -26,6 +26,12 @@
* SUCH DAMAGE.
*/
+/*
+ * The MIPS pipe syscall returns results in two registers, which
+ * we have to copy into the supplied array. This prevents us from
+ * using an auto-generated stub.
+ */
+
#include <asm/unistd.h>
.text
@@ -38,12 +44,17 @@
.ent pipe
pipe:
.set noreorder
-
+ .cpload $t9
li $v0,__NR_pipe
syscall /* syscall returns results in v0,v1 */
-
- sw $v0,0($a0)
- sw $v1,4($a0)
+ bnez $a3, 1f /* check errno */
+ nop
+ sw $v0, 0($a0)
+ sw $v1, 4($a0)
j $ra
- move $v0,$zero
+ move $v0, $zero
+1:
+ la $t9, __set_errno
+ j $t9
+ move $a0, $v0 /* delay slot, prepare args for __set_errno */
.end pipe