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-rw-r--r--libc/sysdeps/linux/i386/mmap64.S112
1 files changed, 112 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/i386/mmap64.S b/libc/sysdeps/linux/i386/mmap64.S
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+++ b/libc/sysdeps/linux/i386/mmap64.S
@@ -0,0 +1,112 @@
+/* Copyright (C) 1995,96,97,98,99,2000,2002 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
+
+
+#define LINKAGE 4
+#define PTR_SIZE 4
+#define SVRSP 16 /* saved register space */
+#define PARMS LINKAGE+SVRSP /* space for 4 saved regs */
+#define ADDR PARMS
+#define LEN ADDR+PTR_SIZE
+#define PROT LEN+4
+#define FLAGS PROT+4
+#define FD FLAGS+4
+#define OFFLO FD+4
+#define OFFHI OFFLO+4
+
+ .text
+ .globl mmap64;
+ .type mmap64,@function;
+ .align 1<<4;
+
+mmap64:
+ /* Save registers. */
+ pushl %ebp
+ pushl %ebx
+ pushl %esi
+ pushl %edi
+
+ movl OFFLO(%esp), %edx
+ movl OFFHI(%esp), %ecx
+ testl $0xfff, %edx
+ jne L_einval
+ shrdl $12, %ecx, %edx /* mmap2 takes the offset in pages. */
+ shrl $12, %ecx
+ jne L_einval
+ movl %edx, %ebp
+
+ movl ADDR(%esp), %ebx
+ movl LEN(%esp), %ecx
+ movl PROT(%esp), %edx
+ movl FLAGS(%esp), %esi
+ movl FD(%esp), %edi
+
+ movl $_NR_mmap2, %eax /* System call number in %eax. */
+ int $0x80
+
+ /* Restore registers. */
+ popl %edi
+ popl %esi
+ popl %ebx
+ popl %ebp
+
+ /* If 0 > %eax > -4096 there was an error. */
+ cmpl $-4095,%eax
+ jae __syscall_error
+ ret
+
+ /* This means the offset value is too large. */
+L_einval:
+ popl %edi
+ popl %esi
+ popl %ebx
+ popl %ebp
+ movl $-EINVAL, %eax
+ jmp __syscall_error
+
+
+__syscall_error:
+ negl %eax
+ pushl %eax
+#ifdef __PIC__
+ call .Lthere
+.Lthere:
+ popl %ebx
+ addl $_GLOBAL_OFFSET_TABLE_+[.- .Lthere ], %ebx
+ call __errno_location@PLT
+#else
+ call __errno_location
+#endif
+ popl %ecx
+ movl %ecx, (%eax)
+ xorl %eax, %eax
+ decl %eax
+
+.Lsize:
+ .size mmap64,.Lsize-mmap64
+
+#endif
+