summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/arm/syscall-eabi.S
diff options
context:
space:
mode:
authorKhem Raj <raj.khem@gmail.com>2009-09-06 01:02:02 -0700
committerKhem Raj <raj.khem@gmail.com>2009-09-06 01:02:50 -0700
commit3e151bdde55f608385099d761a22c2e8951448b0 (patch)
treeeb5cd670707f50fe7050793ab977c94d2924d899 /libc/sysdeps/linux/arm/syscall-eabi.S
parent6943b8336ed253a2ad90816f8d16aa392d0de606 (diff)
Revert "syscall.c: Use common syscall.c for ARM"
This reverts commit b1913a876059949e6c309bafade55e9425ef33fb. OABI is still a requirement. So we override the common syscall implementation specifically for arm port. Signed-off-by: Khem Raj <raj.khem@gmail.com>
Diffstat (limited to 'libc/sysdeps/linux/arm/syscall-eabi.S')
-rw-r--r--libc/sysdeps/linux/arm/syscall-eabi.S73
1 files changed, 73 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/arm/syscall-eabi.S b/libc/sysdeps/linux/arm/syscall-eabi.S
new file mode 100644
index 000000000..b9318821b
--- /dev/null
+++ b/libc/sysdeps/linux/arm/syscall-eabi.S
@@ -0,0 +1,73 @@
+/* Copyright (C) 2005 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <sys/syscall.h>
+#include <bits/arm_asm.h>
+
+/* In the EABI syscall interface, we don't need a special syscall to
+ implement syscall(). It won't work reliably with 64-bit arguments
+ (but that is true on many modern platforms). */
+
+.text
+.global syscall
+.type syscall,%function
+.align 4
+#if defined(THUMB1_ONLY)
+.thumb_func
+syscall:
+ push {r4, r5, r6, r7}
+ mov ip, r0
+ mov r0, r1
+ mov r1, r2
+ mov r2, r3
+ add r7, sp, #(4 * 4)
+ ldmia r7!, {r3, r4, r5, r6}
+ mov r7, ip
+ swi 0x0
+ pop {r4, r5, r6, r7}
+ ldr r1, =0xfffff000
+ cmp r0, r1
+ bcs 1f
+ bx lr
+1:
+ push {r3, lr}
+ bl __syscall_error
+ POP_RET
+.pool
+#else
+syscall:
+ mov ip, sp
+ stmfd sp!, {r4, r5, r6, r7}
+ mov r7, r0
+ mov r0, r1
+ mov r1, r2
+ mov r2, r3
+ ldmfd ip, {r3, r4, r5, r6}
+ swi 0x0
+ ldmfd sp!, {r4, r5, r6, r7}
+ cmn r0, #4096
+ IT(t, cc)
+#if defined(__USE_BX__)
+ bxcc lr
+#else
+ movcc pc, lr
+#endif
+ b __syscall_error
+#endif
+
+.size syscall,.-syscall