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Wed Sep 27 00:27:25 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

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* config.make.in (AS): New variable; set to `$(CC) -c'.

	* posix/unistd.h [__USE_BSD]: Declare profil.

	* elf/dl-load.c (_dl_map_object_from_fd): New function, broken out
	of _dl_map_object.
	(_dl_map_object): Call it.
	* elf/link.h (_dl_map_object_from_fd): Declare it.
This commit is contained in:
Roland McGrath
1995-09-27 06:49:48 +00:00
parent c709e372e8
commit ea03559a9d
5 changed files with 75 additions and 35 deletions
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83
elf/dl-load.c
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@ -108,40 +108,8 @@ _dl_map_object (struct link_map *loader, const char *name,
Elf32_Addr *entry_point)
{
int fd;
struct link_map *l = NULL;
char *realname;
const size_t pagesize = getpagesize ();
void *file_mapping = NULL;
size_t mapping_size = 0;
void lose (int code, const char *msg)
{
(void) close (fd);
if (file_mapping)
munmap (file_mapping, mapping_size);
_dl_signal_error (code, l ? l->l_name : name, msg);
}
/* Make sure LOCATION is mapped in. */
void *map (off_t location, size_t size)
{
if ((off_t) mapping_size <= location + (off_t) size)
{
void *result;
if (file_mapping)
munmap (file_mapping, mapping_size);
mapping_size = (location + size + 1 + pagesize - 1);
mapping_size &= ~(pagesize - 1);
result = mmap (file_mapping, mapping_size, PROT_READ,
MAP_COPY|MAP_FILE, fd, 0);
if (result == (void *) -1)
lose (errno, "cannot map file data");
file_mapping = result;
}
return file_mapping + location;
}
const Elf32_Ehdr *header;
struct link_map *l;
/* Look for this name among those already loaded. */
for (l = _dl_loaded; l; l = l->l_next)
@ -182,7 +150,52 @@ _dl_map_object (struct link_map *loader, const char *name,
}
if (fd == -1)
lose (errno, "cannot open shared object file");
_dl_signal_error (errno, name, "cannot open shared object file");
return _dl_map_object_from_fd (name, fd, realname, entry_point);
}
/* Map in the shared object NAME, actually located in REALNAME, and already
opened on FD. */
struct link_map *
_dl_map_object_from_fd (const char *name, int fd, char *realname,
Elf32_Addr *entry_point)
{
struct link_map *l = NULL;
const size_t pagesize = getpagesize ();
void *file_mapping = NULL;
size_t mapping_size = 0;
void lose (int code, const char *msg)
{
(void) close (fd);
if (file_mapping)
munmap (file_mapping, mapping_size);
_dl_signal_error (code, l ? l->l_name : name, msg);
}
/* Make sure LOCATION is mapped in. */
void *map (off_t location, size_t size)
{
if ((off_t) mapping_size <= location + (off_t) size)
{
void *result;
if (file_mapping)
munmap (file_mapping, mapping_size);
mapping_size = (location + size + 1 + pagesize - 1);
mapping_size &= ~(pagesize - 1);
result = mmap (file_mapping, mapping_size, PROT_READ,
MAP_COPY|MAP_FILE, fd, 0);
if (result == (void *) -1)
lose (errno, "cannot map file data");
file_mapping = result;
}
return file_mapping + location;
}
const Elf32_Ehdr *header;
/* Look again to see if the real name matched another already loaded. */
for (l = _dl_loaded; l; l = l->l_next)
@ -191,11 +204,11 @@ _dl_map_object (struct link_map *loader, const char *name,
/* The object is already loaded.
Just bump its reference count and return it. */
close (fd);
free (realname);
++l->l_opencount;
return l;
}
/* Map in the first page to read the header. */
header = map (0, sizeof *header);