diff options
| -rw-r--r-- | libc/sysdeps/linux/i386/Makefile | 2 | ||||
| -rw-r--r-- | libc/sysdeps/linux/i386/mmap64.S | 112 |
2 files changed, 113 insertions, 1 deletions
diff --git a/libc/sysdeps/linux/i386/Makefile b/libc/sysdeps/linux/i386/Makefile index c7e1db947..b3bb06df6 100644 --- a/libc/sysdeps/linux/i386/Makefile +++ b/libc/sysdeps/linux/i386/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 syscall.S + bsd-_setjmp.S syscall.S mmap64.S ifeq ($(strip $(UCLIBC_PROFILING)),y) SSRC+=mcount.S endif diff --git a/libc/sysdeps/linux/i386/mmap64.S b/libc/sysdeps/linux/i386/mmap64.S new file mode 100644 index 000000000..b5d948878 --- /dev/null +++ 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 + |