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/SYSCALLS.TXT b/libc/SYSCALLS.TXT
index 46e7b1f..5c1e36e 100644
--- a/libc/SYSCALLS.TXT
+++ b/libc/SYSCALLS.TXT
@@ -50,6 +50,7 @@
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
diff --git a/libc/arch-arm/syscalls.mk b/libc/arch-arm/syscalls.mk
index e6c84f6..1f2a1cd 100644
--- a/libc/arch-arm/syscalls.mk
+++ b/libc/arch-arm/syscalls.mk
@@ -14,6 +14,7 @@
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
diff --git a/libc/arch-arm/syscalls/readahead.S b/libc/arch-arm/syscalls/readahead.S
new file mode 100644
index 0000000..6aa8265
--- /dev/null
+++ b/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)
diff --git a/libc/arch-sh/syscalls.mk b/libc/arch-sh/syscalls.mk
index 1d87600..9970fcf 100644
--- a/libc/arch-sh/syscalls.mk
+++ b/libc/arch-sh/syscalls.mk
@@ -15,6 +15,7 @@
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
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
diff --git a/libc/arch-x86/syscalls.mk b/libc/arch-x86/syscalls.mk
index 3b85025..48d1731 100644
--- a/libc/arch-x86/syscalls.mk
+++ b/libc/arch-x86/syscalls.mk
@@ -15,6 +15,7 @@
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
diff --git a/libc/arch-x86/syscalls/readahead.S b/libc/arch-x86/syscalls/readahead.S
new file mode 100644
index 0000000..b89314f
--- /dev/null
+++ b/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
diff --git a/libc/include/sys/linux-syscalls.h b/libc/include/sys/linux-syscalls.h
index 7b74a4b..2fa5d3a 100644
--- a/libc/include/sys/linux-syscalls.h
+++ b/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)
diff --git a/libc/include/sys/linux-unistd.h b/libc/include/sys/linux-unistd.h
index ae9077f..f060374 100644
--- a/libc/include/sys/linux-unistd.h
+++ b/libc/include/sys/linux-unistd.h
@@ -20,6 +20,7 @@
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);
