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authorMike Frysinger <vapier@gentoo.org>2005-09-07 22:16:43 +0000
committerMike Frysinger <vapier@gentoo.org>2005-09-07 22:16:43 +0000
commit27f04c4b3ed2ec3d3469615d303e41ed61b1c32f (patch)
tree08df2c091e379682dda6346275d4588426b09de4
parentbc5829aeab779ceb1389e218e641f14412483f16 (diff)
grab a tiny mmap implementation from glibc
-rw-r--r--libc/sysdeps/linux/i386/Makefile2
-rw-r--r--libc/sysdeps/linux/i386/mmap.S49
2 files changed, 50 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile
index e7cee0c0b..bde820b2b 100644
--- a/libc/sysdeps/linux/i386/Makefile
+++ b/libc/sysdeps/linux/i386/Makefile
@@ -25,7 +25,7 @@ SCRT_OBJ = $(patsubst %,S%, $(CRT_OBJ))
CTOR_TARGETS=$(TOPDIR)lib/crti.o $(TOPDIR)lib/crtn.o
SSRC=__longjmp.S vfork.S clone.S setjmp.S bsd-setjmp.S \
- bsd-_setjmp.S syscall.S mmap64.S
+ bsd-_setjmp.S syscall.S mmap.S mmap64.S
SOBJS=$(patsubst %.S,%.o, $(SSRC))
CSRC=brk.c sigaction.c __syscall_error.c
diff --git a/libc/sysdeps/linux/i386/mmap.S b/libc/sysdeps/linux/i386/mmap.S
new file mode 100644
index 000000000..5dde939bf
--- /dev/null
+++ b/libc/sysdeps/linux/i386/mmap.S
@@ -0,0 +1,49 @@
+/* Copyright (C) 1995,96,97,98,99,2000,2002,2005 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. */
+
+#define _ERRNO_H 1
+#include <features.h>
+#include <bits/errno.h>
+#include <sys/syscall.h>
+
+.text
+.global mmap
+.type mmap,%function
+mmap:
+
+ /* Save registers. */
+ movl %ebx, %edx
+
+ movl $__NR_mmap, %eax /* System call number in %eax. */
+
+ lea 4(%esp), %ebx /* Address of args is 1st arg. */
+
+ /* Do the system call trap. */
+ int $0x80
+
+ /* Restore registers. */
+ movl %edx, %ebx
+
+ /* If 0 > %eax > -4096 there was an error. */
+ cmpl $-4096, %eax
+ ja __syscall_error
+
+ /* Successful; return the syscall's value. */
+ ret
+
+.size mmap,.-mmap