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ntdll: Get rid of the unaligned_mmap wrapper.

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This commit is contained in:
Alexandre Julliard 2008-11-17 20:34:19 +01:00
parent 04eb1e6a63
commit 28c411b627
1 changed files with 1 additions and 58 deletions
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59
dlls/ntdll/virtual.c
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@ -754,63 +754,6 @@ done:
} }
/***********************************************************************
* unaligned_mmap
*
* Linux kernels before 2.4.x can support non page-aligned offsets, as
* long as the offset is aligned to the filesystem block size. This is
* a big performance gain so we want to take advantage of it.
*
* However, when we use 64-bit file support this doesn't work because
* glibc rejects unaligned offsets. Also glibc 2.1.3 mmap64 is broken
* in that it rounds unaligned offsets down to a page boundary. For
* these reasons we do a direct system call here.
*/
static void *unaligned_mmap( void *addr, size_t length, unsigned int prot,
unsigned int flags, int fd, off_t offset )
{
#if defined(linux) && defined(__i386__) && defined(__GNUC__)
if (!(offset >> 32) && (offset & page_mask))
{
int ret;
struct
{
void *addr;
unsigned int length;
unsigned int prot;
unsigned int flags;
unsigned int fd;
unsigned int offset;
} args;
args.addr = addr;
args.length = length;
args.prot = prot;
args.flags = flags;
args.fd = fd;
args.offset = offset;
__asm__ __volatile__("push %%ebx\n\t"
"movl %2,%%ebx\n\t"
"int $0x80\n\t"
"popl %%ebx"
: "=a" (ret)
: "0" (90), /* SYS_mmap */
"q" (&args)
: "memory" );
if (ret < 0 && ret > -4096)
{
errno = -ret;
ret = -1;
}
return (void *)ret;
}
#endif
return mmap( addr, length, prot, flags, fd, offset );
}
/*********************************************************************** /***********************************************************************
* map_file_into_view * map_file_into_view
* *
@ -832,7 +775,7 @@ static NTSTATUS map_file_into_view( struct file_view *view, int fd, size_t start
{ {
int flags = MAP_FIXED | (shared_write ? MAP_SHARED : MAP_PRIVATE); int flags = MAP_FIXED | (shared_write ? MAP_SHARED : MAP_PRIVATE);
if (unaligned_mmap( (char *)view->base + start, size, prot, flags, fd, offset ) != (void *)-1) if (mmap( (char *)view->base + start, size, prot, flags, fd, offset ) != (void *)-1)
goto done; goto done;
/* mmap() failed; if this is because the file offset is not */ /* mmap() failed; if this is because the file offset is not */