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authorEric Andersen <andersen@codepoet.org>2003-06-27 08:37:55 +0000
committerEric Andersen <andersen@codepoet.org>2003-06-27 08:37:55 +0000
commit5c47d5a02a975e14a1ddf867d8632add0085b47c (patch)
treef4df20b00ce1808701ef233ddbffbd3f16957bdf
parentbd18f549e7e88c9b3121d7db6502ecb362149004 (diff)
Implement mmap64 for arm
-rw-r--r--libc/sysdeps/linux/arm/Makefile2
-rw-r--r--libc/sysdeps/linux/arm/mmap64.S79
2 files changed, 80 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/arm/Makefile b/libc/sysdeps/linux/arm/Makefile
index 02a0cedc1..5fd0bbe85 100644
--- a/libc/sysdeps/linux/arm/Makefile
+++ b/libc/sysdeps/linux/arm/Makefile
@@ -25,7 +25,7 @@ CRT0_OBJ = crt0.o crt1.o gcrt1.o
CRT0_DEPS=gmon-start.S
SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \
- bsd-_setjmp.S sigrestorer.S
+ bsd-_setjmp.S sigrestorer.S mmap64.S
SOBJS=$(patsubst %.S,%.o, $(SSRC))
CSRC=brk.c syscall.c ioperm.c sigaction.c
diff --git a/libc/sysdeps/linux/arm/mmap64.S b/libc/sysdeps/linux/arm/mmap64.S
new file mode 100644
index 000000000..0da4afbb0
--- /dev/null
+++ b/libc/sysdeps/linux/arm/mmap64.S
@@ -0,0 +1,79 @@
+/* Copyright (C) 2000 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. */
+
+#define _ERRNO_H 1
+#include <features.h>
+#include <bits/errno.h>
+#include <sys/syscall.h>
+
+#if defined __UCLIBC_HAS_LFS__ && defined __NR_mmap2
+
+
+ /* The mmap2 system call takes six arguments, all in registers. */
+ .text
+ .global mmap64;
+ .type mmap64,%function
+ .align 4;
+
+mmap64:
+ stmfd sp!, {r4, r5, lr}
+ ldr r5, [sp, $16]
+ ldr r4, [sp, $12]
+ movs ip, r5, lsl $20 @ check that offset is page-aligned
+ bne .Linval
+ ldr ip, [sp, $20]
+ mov r5, r5, lsr $12
+ orr r5, r5, ip, lsl $20 @ compose page offset
+ movs ip, ip, lsr $12
+ bne .Linval @ check for overflow
+ mov ip, r0
+ swi __NR_mmap2
+ cmn r0, $4096
+ ldmccfd sp!, {r4, r5, pc}
+ cmn r0, $ENOSYS
+ ldmnefd sp!, {r4, r5, lr}
+ bne __syscall_error (PLT)
+ /* The current kernel does not support mmap2. Fall back to plain
+ mmap if the offset is small enough. */
+ ldr r5, [sp, $20]
+ mov r0, ip @ first arg was clobbered
+ teq r5, $0
+ ldmeqfd sp!, {r4, r5, lr}
+ beq mmap (PLT)
+.Linval:
+ mov r0, $-EINVAL
+ ldmfd sp!, {r4, r5, lr}
+ b __syscall_error (PLT)
+
+__syscall_error:
+ /* Looks like the syscall choked -- set errno */
+ ldr r3, .L4
+ /* Calculate the - of the syscall result, in case we need it */
+ rsb r2, r0, $0
+
+ /* errno = -result */
+ str r2, [r9,r3]
+
+ /* return -1 */
+ mvn r0, $0
+ mov pc, lr
+.size mmap64,.-mmap64;
+
+.L4: .word errno
+
+#endif