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/* Copyright (C) 2003, 2004 Red Hat, Inc.
Contributed by Alexandre Oliva <aoliva@redhat.com>
This file is part of uClibc.
uClibc 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.
uClibc 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
Library General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with uClibc; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139,
USA. */
/* We can't use the real errno in ldso, since it has not yet
* been dynamicly linked in yet. */
#include "sys/syscall.h"
extern int _dl_errno;
#undef __set_errno
#define __set_errno(X) {(_dl_errno) = (X);}
#include <sys/mman.h>
/* The code below is extracted from libc/sysdeps/linux/frv/_mmap.c */
#if DYNAMIC_LOADER_IN_SIMULATOR
#define __NR___syscall_mmap2 __NR_mmap2
static inline _syscall6(__ptr_t, __syscall_mmap2, __ptr_t, addr,
size_t, len, int, prot, int, flags, int, fd, off_t, offset);
/* Make sure we don't get another definition of _dl_mmap from the
machine-independent code. */
#undef __NR_mmap
#undef __NR_mmap2
/* This is always 12, even on architectures where PAGE_SHIFT != 12. */
# ifndef MMAP2_PAGE_SHIFT
# define MMAP2_PAGE_SHIFT 12
# endif
#include <bits/uClibc_page.h> /* for PAGE_SIZE */
inline static void *_dl_memset(void*,int,size_t);
inline static ssize_t _dl_pread(int fd, void *buf, size_t count, off_t offset);
static __ptr_t
_dl_mmap(__ptr_t addr, size_t len, int prot, int flags, int fd, __off_t offset)
{
size_t plen = (len + PAGE_SIZE - 1) & -PAGE_SIZE;
/* This is a hack to enable the dynamic loader to run within a
simulator that doesn't support mmap, with a number of very ugly
tricks. Also, it's not as useful as it sounds, since only dynamic
executables without DT_NEEDED dependencies can be run. AFAIK, they
can only be created with -pie. This trick suffices to enable the
dynamic loader to obtain a blank page that it maps early in the
bootstrap. */
if ((flags & MAP_FIXED) == 0)
{
void *_dl_mmap_base = 0;
__ptr_t *ret = 0;
if (! _dl_mmap_base)
{
void *stack;
__asm__ ("mov sp, %0" : "=r" (stack));
_dl_mmap_base = (void *)(((long)stack + 2 * PAGE_SIZE) & -PAGE_SIZE);
retry:
if (((void **)_dl_mmap_base)[0] == _dl_mmap_base
&& ((void **)_dl_mmap_base)[1023] == _dl_mmap_base
&& (((void **)_dl_mmap_base)[177]
== ((void **)_dl_mmap_base)[771]))
{
while (((void**)_dl_mmap_base)[177])
{
_dl_mmap_base = ((void**)_dl_mmap_base)[177];
if (!(((void **)_dl_mmap_base)[0] == _dl_mmap_base
&& ((void **)_dl_mmap_base)[1023] == _dl_mmap_base
&& (((void **)_dl_mmap_base)[177]
== ((void**)_dl_mmap_base)[771])))
((void(*)())0)();
}
}
else
{
int i;
for (i = 0; i < (int)PAGE_SIZE; i++)
if (*(char*)(_dl_mmap_base + i))
break;
if (i != PAGE_SIZE)
{
_dl_mmap_base = (void*)((long)_dl_mmap_base + PAGE_SIZE);
goto retry;
}
((void**)_dl_mmap_base)[-1] =
((void**)_dl_mmap_base)[0] =
((void**)_dl_mmap_base)[1023] =
_dl_mmap_base;
}
}
if (_dl_mmap_base)
{
if (!(((void **)_dl_mmap_base)[0] == _dl_mmap_base
&& ((void **)_dl_mmap_base)[1023] == _dl_mmap_base
&& (((void **)_dl_mmap_base)[177]
== ((void**)_dl_mmap_base)[771])))
((void(*)())0)();
ret = (__ptr_t)((char*)_dl_mmap_base + PAGE_SIZE);
_dl_mmap_base =
((void**)_dl_mmap_base)[177] =
((void**)_dl_mmap_base)[771] =
(char*)_dl_mmap_base + plen + PAGE_SIZE;
((void**)_dl_mmap_base)[0] =
((void**)_dl_mmap_base)[1023] =
_dl_mmap_base;
}
if ((flags & MAP_ANONYMOUS) != 0)
{
_dl_memset (ret, 0, plen);
return ret;
}
flags |= MAP_FIXED;
addr = ret;
}
if (offset & ((1 << MMAP2_PAGE_SHIFT) - 1)) {
#if 0
__set_errno (EINVAL);
#endif
return MAP_FAILED;
}
if ((flags & MAP_FIXED) != 0)
{
if (_dl_pread(fd, addr, len, offset) != (ssize_t)len)
return (void*)MAP_FAILED;
if (plen != len)
_dl_memset (addr + len, 0, plen - len);
return addr;
}
return(__syscall_mmap2(addr, len, prot, flags, fd, (off_t) (offset >> MMAP2_PAGE_SHIFT)));
}
#endif
#ifdef __NR_pread
#ifdef DYNAMIC_LOADER_IN_SIMULATOR
#include <unistd.h>
#define __NR___syscall_lseek __NR_lseek
inline static unsigned long _dl_read(int fd, const void *buf, unsigned long count);
inline static _syscall3(__off_t, __syscall_lseek, int, fd, __off_t, offset,
int, whence);
inline static ssize_t
_dl_pread(int fd, void *buf, size_t count, off_t offset)
{
__off_t orig = __syscall_lseek (fd, 0, SEEK_CUR);
ssize_t ret;
if (orig == -1)
return -1;
if (__syscall_lseek (fd, offset, SEEK_SET) != offset)
return -1;
ret = _dl_read (fd, buf, count);
if (__syscall_lseek (fd, orig, SEEK_SET) != orig)
((void(*)())0)();
return ret;
}
#else
#define __NR___syscall_pread __NR_pread
inline static _syscall5(ssize_t, __syscall_pread, int, fd, void *, buf,
size_t, count, off_t, offset_hi, off_t, offset_lo);
inline static ssize_t
_dl_pread(int fd, void *buf, size_t count, off_t offset)
{
return(__syscall_pread(fd,buf,count,__LONG_LONG_PAIR (offset >> 31, offset)));
}
#endif
#endif
#ifdef __NR_sram_alloc
#define __NR__dl_sram_alloc __NR_sram_alloc
inline static _syscall2(__ptr_t, _dl_sram_alloc,
size_t, len, unsigned long, flags);
#endif
#ifdef __NR_sram_free
#define __NR__dl_sram_free __NR_sram_free
inline static _syscall1(int, _dl_sram_free, __ptr_t, addr);
#endif
#ifdef __NR_dma_memcpy
#define __NR__dl_dma_memcpy __NR_dma_memcpy
inline static _syscall3(__ptr_t, _dl_dma_memcpy,
__ptr_t, dest, __ptr_t, src, size_t, len);
#endif
#define __UCLIBC_MMAP_HAS_6_ARGS__
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