sreadahead: adding readahead system call into bionic libc
Add bionic libc to support readahead system call.
This is needed to enable sreadahead to work.
Change-Id: I3856e1a3833db82e6cf42fd34af7631bd40cc723
Author: Winson Yung <winson.w.yung@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
diff --git a/libc/arch-sh/syscalls/readahead.S b/libc/arch-sh/syscalls/readahead.S
new file mode 100644
index 0000000..df64b5f
--- /dev/null
+++ b/libc/arch-sh/syscalls/readahead.S
@@ -0,0 +1,32 @@
+/* autogenerated by gensyscalls.py */
+#include <sys/linux-syscalls.h>
+
+ .text
+ .type readahead, @function
+ .globl readahead
+ .align 4
+
+readahead:
+
+ /* invoke trap */
+ mov.l 0f, r3 /* trap num */
+ trapa #(4 + 0x10)
+
+ /* check return value */
+ cmp/pz r0
+ bt __NR_readahead_end
+
+ /* keep error number */
+ sts.l pr, @-r15
+ mov.l 1f, r1
+ jsr @r1
+ mov r0, r4
+ lds.l @r15+, pr
+
+__NR_readahead_end:
+ rts
+ nop
+
+ .align 2
+0: .long __NR_readahead
+1: .long __set_syscall_errno