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>

libc/SYSCALLS.TXT

@@ -50,6 +50,7 @@ gid_t   getegid:getegid32 ()       202
 uid_t   getresuid:getresuid32 ()   209
 gid_t   getresgid:getresgid32 ()   211
 pid_t   gettid()                   224
+ssize_t readahead(int, off64_t, size_t)     225
 int     getgroups:getgroups32(int, gid_t *)    205
 pid_t   getpgid(pid_t)             132
 pid_t   getppid()		   64

libc/arch-arm/syscalls.mk

@@ -14,6 +14,7 @@ syscall_src += arch-arm/syscalls/getegid.S
 syscall_src += arch-arm/syscalls/getresuid.S
 syscall_src += arch-arm/syscalls/getresgid.S
 syscall_src += arch-arm/syscalls/gettid.S
+syscall_src += arch-arm/syscalls/readahead.S
 syscall_src += arch-arm/syscalls/getgroups.S
 syscall_src += arch-arm/syscalls/getpgid.S
 syscall_src += arch-arm/syscalls/getppid.S

libc/arch-arm/syscalls/readahead.S

@@ -0,0 +1,16 @@
+/* autogenerated by gensyscalls.py */
+#include <machine/asm.h>
+#include <sys/linux-syscalls.h>
+
+ENTRY(readahead)
+    mov     ip, sp
+    .save   {r4, r5, r6, r7}
+    stmfd   sp!, {r4, r5, r6, r7}
+    ldmfd   ip, {r4, r5, r6}
+    ldr     r7, =__NR_readahead
+    swi     #0
+    ldmfd   sp!, {r4, r5, r6, r7}
+    movs    r0, r0
+    bxpl    lr
+    b       __set_syscall_errno
+END(readahead)

libc/arch-sh/syscalls.mk

@@ -15,6 +15,7 @@ syscall_src += arch-sh/syscalls/getegid.S
 syscall_src += arch-sh/syscalls/getresuid.S
 syscall_src += arch-sh/syscalls/getresgid.S
 syscall_src += arch-sh/syscalls/gettid.S
+syscall_src += arch-sh/syscalls/readahead.S
 syscall_src += arch-sh/syscalls/getgroups.S
 syscall_src += arch-sh/syscalls/getpgid.S
 syscall_src += arch-sh/syscalls/getppid.S

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

libc/arch-x86/syscalls.mk

@@ -15,6 +15,7 @@ syscall_src += arch-x86/syscalls/getegid.S
 syscall_src += arch-x86/syscalls/getresuid.S
 syscall_src += arch-x86/syscalls/getresgid.S
 syscall_src += arch-x86/syscalls/gettid.S
+syscall_src += arch-x86/syscalls/readahead.S
 syscall_src += arch-x86/syscalls/getgroups.S
 syscall_src += arch-x86/syscalls/getpgid.S
 syscall_src += arch-x86/syscalls/getppid.S

libc/arch-x86/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:
+    pushl   %ebx
+    pushl   %ecx
+    pushl   %edx
+    pushl   %esi
+    mov     20(%esp), %ebx
+    mov     24(%esp), %ecx
+    mov     28(%esp), %edx
+    mov     32(%esp), %esi
+    movl    $__NR_readahead, %eax
+    int     $0x80
+    cmpl    $-129, %eax
+    jb      1f
+    negl    %eax
+    pushl   %eax
+    call    __set_errno
+    addl    $4, %esp
+    orl     $-1, %eax
+1:
+    popl    %esi
+    popl    %edx
+    popl    %ecx
+    popl    %ebx
+    ret

libc/include/sys/linux-syscalls.h

@@ -20,6 +20,7 @@
 #define __NR_getresuid32                  (__NR_SYSCALL_BASE + 209)
 #define __NR_getresgid32                  (__NR_SYSCALL_BASE + 211)
 #define __NR_gettid                       (__NR_SYSCALL_BASE + 224)
+#define __NR_readahead                    (__NR_SYSCALL_BASE + 225)
 #define __NR_getgroups32                  (__NR_SYSCALL_BASE + 205)
 #define __NR_getpgid                      (__NR_SYSCALL_BASE + 132)
 #define __NR_getppid                      (__NR_SYSCALL_BASE + 64)

libc/include/sys/linux-unistd.h

@@ -20,6 +20,7 @@ gid_t            getegid (void);
 uid_t            getresuid (void);
 gid_t            getresgid (void);
 pid_t            gettid (void);
+ssize_t          readahead (int, off64_t, size_t);
 int              getgroups (int, gid_t *);
 pid_t            getpgid (pid_t);
 pid_t            getppid (void);