glibc/sysdeps/mach/hurd/dl-sysdep.c

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/* Operating system support for run-time dynamic linker. Hurd version.
Copyright (C) 1995, 1996 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include <hurd.h>
#include <link.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <sys/wait.h>
#include <assert.h>
#include <sysdep.h>
#include <mach/mig_support.h>
#include "hurdstartup.h"
#include <mach/host_info.h>
#include "../stdio-common/_itoa.h"
#include <hurd/auth.h>
#include <hurd/term.h>
#include <stdarg.h>
#include <ctype.h>
#include <sys/stat.h>
#include "dl-machine.h"
extern void __mach_init (void);
extern int _dl_argc;
extern char **_dl_argv;
extern char **_environ;
int __libc_enable_secure;
struct hurd_startup_data *_dl_hurd_data;
unsigned int __hurd_threadvar_max = _HURD_THREADVAR_MAX;
static unsigned long int threadvars[_HURD_THREADVAR_MAX];
unsigned long int __hurd_threadvar_stack_offset
= (unsigned long int) &threadvars;
unsigned long int __hurd_sigthread_stack_base;
unsigned long int __hurd_sigthread_stack_end;
unsigned long int *__hurd_sigthread_variables;
unsigned long int __hurd_threadvar_stack_mask;
/* XXX loser kludge for vm_map kernel bug */
static vm_address_t fmha;
static vm_size_t fmhs;
static void unfmh(void){
__vm_deallocate(__mach_task_self(),fmha,fmhs);}
static void fmh(void) {
error_t err;int x;mach_port_t p;
vm_address_t a=0x08000000U,max=VM_MAX_ADDRESS;
while (!(err=__vm_region(__mach_task_self(),&a,&fmhs,&x,&x,&x,&x,&p,&x))){
__mach_port_deallocate(__mach_task_self(),p);
if (a+fmhs>=0x80000000U){
max=a; break;}
fmha=a+=fmhs;}
if (err) assert(err==KERN_NO_SPACE);
if (!fmha)fmhs=0;else{
fmhs=max-fmha;
err = __vm_map (__mach_task_self (),
&fmha, fmhs, 0, 0, MACH_PORT_NULL, 0, 1,
VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
assert_perror(err);}
}
/* XXX loser kludge for vm_map kernel bug */
Elf32_Addr
_dl_sysdep_start (void **start_argptr,
void (*dl_main) (const Elf32_Phdr *phdr, Elf32_Word phent,
Elf32_Addr *user_entry))
{
extern void _start ();
void go (int *argdata)
{
extern unsigned int _dl_skip_args; /* rtld.c */
char **p;
/* Cache the information in various global variables. */
_dl_argc = *argdata;
_dl_argv = 1 + (char **) argdata;
_environ = &_dl_argv[_dl_argc + 1];
for (p = _environ; *p++;); /* Skip environ pointers and terminator. */
if ((void *) p == _dl_argv[0])
{
static struct hurd_startup_data nodata;
_dl_hurd_data = &nodata;
nodata.user_entry = (vm_address_t) &_start;
}
else
_dl_hurd_data = (void *) p;
__libc_enable_secure = _dl_hurd_data->flags & EXEC_SECURE;
if (_dl_hurd_data->flags & EXEC_STACK_ARGS &&
_dl_hurd_data->user_entry == 0)
_dl_hurd_data->user_entry = (vm_address_t) &_start;
unfmh(); /* XXX */
if (_dl_hurd_data->user_entry == (vm_address_t) &_start)
/* We were invoked as a command, not as the program interpreter.
The generic ld.so code supports this: it will parse the args
as "ld.so PROGRAM [ARGS...]". For booting the Hurd, we
support an additional special syntax:
ld.so [-LIBS...] PROGRAM [ARGS...]
Each LIBS word consists of "FILENAME=MEMOBJ";
for example "-/lib/libc.so=123" says that the contents of
/lib/libc.so are found in a memory object whose port name
in our task is 123. */
while (_dl_argc > 2 && _dl_argv[1][0] == '-' && _dl_argv[1][1] != '-')
{
char *lastslash, *memobjname, *p;
struct link_map *l;
mach_port_t memobj;
error_t err;
++_dl_skip_args;
--_dl_argc;
p = _dl_argv++[1] + 1;
memobjname = strchr (p, '=');
if (! memobjname)
_dl_sysdep_fatal ("Bogus library spec: ", p, "\n", NULL);
*memobjname++ = '\0';
memobj = 0;
while (*memobjname != '\0')
memobj = (memobj * 10) + (*memobjname++ - '0');
/* Add a user reference on the memory object port, so we will
still have one after _dl_map_object_from_fd calls our
`close'. */
err = __mach_port_mod_refs (__mach_task_self (), memobj,
MACH_PORT_RIGHT_SEND, +1);
assert_perror (err);
lastslash = strrchr (p, '/');
l = _dl_map_object_from_fd (lastslash ? lastslash + 1 : p,
memobj, strdup (p));
/* Squirrel away the memory object port where it
can be retrieved by the program later. */
l->l_info[DT_NULL] = (void *) memobj;
}
/* Call elf/rtld.c's main program. It will set everything
up and leave us to transfer control to USER_ENTRY. */
(*dl_main) ((const Elf32_Phdr *) _dl_hurd_data->phdr,
_dl_hurd_data->phdrsz / sizeof (Elf32_Phdr),
&_dl_hurd_data->user_entry);
if (_dl_skip_args && _dl_argv[-_dl_skip_args] == (char *) p)
{
/* We are ignoring the first few arguments, but we have no Hurd
startup data. It is magical convention that ARGV[0] == P in
this case. The startup code in init-first.c will get confused
if this is not the case, so we must rearrange things to make
it so. Overwrite the original ARGV[0] at P with
ARGV[_dl_skip_args]. */
assert ((char *) p < _dl_argv[0]);
_dl_argv[0] = strcpy ((char *) p, _dl_argv[0]);
}
{
extern void _dl_start_user (void);
/* Unwind the stack to ARGDATA and simulate a return from _dl_start
to the RTLD_START code which will run the user's entry point. */
RETURN_TO (argdata, &_dl_start_user, _dl_hurd_data->user_entry);
}
}
/* Set up so we can do RPCs. */
__mach_init ();
fmh(); /* XXX */
/* See hurd/hurdstartup.c; this deals with getting information
from the exec server and slicing up the arguments.
Then it will call `go', above. */
_hurd_startup (start_argptr, &go);
LOSE;
abort ();
}
void
_dl_sysdep_start_cleanup (void)
{
/* Deallocate the reply port and task port rights acquired by
__mach_init. We are done with them now, and the user will
reacquire them for himself when he wants them. */
__mig_dealloc_reply_port (MACH_PORT_NULL);
__mach_port_deallocate (__mach_task_self (), __mach_task_self_);
}
void
_dl_sysdep_fatal (const char *msg, ...)
{
va_list ap;
va_start (ap, msg);
do
{
size_t len = strlen (msg);
mach_msg_type_number_t nwrote;
do
{
if (__io_write (_hurd_init_dtable[2], msg, len, -1, &nwrote))
break;
len -= nwrote;
msg += nwrote;
} while (nwrote > 0);
msg = va_arg (ap, const char *);
} while (msg);
va_end (ap);
_exit (127);
}
void
_dl_sysdep_message (const char *msg, ...)
{
va_list ap;
va_start (ap, msg);
do
{
size_t len = strlen (msg);
mach_msg_type_number_t nwrote;
do
{
if (__io_write (_hurd_init_dtable[1], msg, len, -1, &nwrote))
break;
len -= nwrote;
msg += nwrote;
} while (nwrote > 0);
msg = va_arg (ap, const char *);
} while (msg);
va_end (ap);
}
/* Minimal open/close/mmap implementation sufficient for initial loading of
shared libraries. These are weak definitions so that when the
dynamic linker re-relocates itself to be user-visible (for -ldl),
it will get the user's definition (i.e. usually libc's). */
/* Open FILE_NAME and return a read-mmapable port in MEMOBJ_RD for it, or
return an error. If STAT is non-zero, stat the file into that stat buffer. */
static error_t
open_file (const char *file_name, int mode,
mach_port_t *memobj_rd, struct stat *stat)
{
enum retry_type doretry;
char retryname[1024]; /* XXX string_t LOSES! */
file_t startdir, newpt, fileport;
int dealloc_dir;
int nloops;
error_t err;
assert (mode == O_RDONLY);
startdir = _dl_hurd_data->portarray[file_name[0] == '/' ?
INIT_PORT_CRDIR : INIT_PORT_CWDIR];
while (file_name[0] == '/')
file_name++;
if (err = __dir_lookup (startdir, (char *)file_name, mode, 0,
&doretry, retryname, &fileport))
return err;
dealloc_dir = 0;
nloops = 0;
while (1)
{
if (dealloc_dir)
__mach_port_deallocate (__mach_task_self (), startdir);
if (err)
return err;
switch (doretry)
{
case FS_RETRY_REAUTH:
{
mach_port_t ref = __mach_reply_port ();
err = __io_reauthenticate (fileport, ref, MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = __auth_user_authenticate
(_dl_hurd_data->portarray[INIT_PORT_AUTH],
ref, MACH_MSG_TYPE_MAKE_SEND,
&newpt);
__mach_port_destroy (__mach_task_self (), ref);
}
__mach_port_deallocate (__mach_task_self (), fileport);
if (err)
return err;
fileport = newpt;
/* Fall through. */
case FS_RETRY_NORMAL:
#ifdef SYMLOOP_MAX
if (nloops++ >= SYMLOOP_MAX)
return ELOOP;
#endif
/* An empty RETRYNAME indicates we have the final port. */
if (retryname[0] == '\0')
{
mach_port_t memobj_wr;
dealloc_dir = 1;
opened:
/* We have the file open. Now map it. */
if (stat)
err = __io_stat (fileport, stat);
if (! err)
err = __io_map (fileport, memobj_rd, &memobj_wr);
if (dealloc_dir)
__mach_port_deallocate (__mach_task_self (), fileport);
if (err)
return err;
if (memobj_wr != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), memobj_wr);
return 0;
}
startdir = fileport;
dealloc_dir = 1;
file_name = retryname;
break;
case FS_RETRY_MAGICAL:
switch (retryname[0])
{
case '/':
startdir = _dl_hurd_data->portarray[INIT_PORT_CRDIR];
dealloc_dir = 0;
if (fileport != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), fileport);
file_name = &retryname[1];
break;
case 'f':
if (retryname[1] == 'd' && retryname[2] == '/' &&
isdigit (retryname[3]))
{
/* We can't use strtol for the decoding here
because it brings in hairy locale bloat. */
char *p;
int fd = 0;
for (p = &retryname[3]; isdigit (*p); ++p)
fd = (fd * 10) + (*p - '0');
/* Check for excess text after the number. A slash is
valid; it ends the component. Anything else does not
name a numeric file descriptor. */
if (*p != '/' && *p != '\0')
return ENOENT;
if (fd < 0 || fd >= _dl_hurd_data->dtablesize ||
_dl_hurd_data->dtable[fd] == MACH_PORT_NULL)
/* If the name was a proper number, but the file
descriptor does not exist, we return EBADF instead
of ENOENT. */
return EBADF;
fileport = _dl_hurd_data->dtable[fd];
if (*p == '\0')
{
/* This descriptor is the file port we want. */
dealloc_dir = 0;
goto opened;
}
else
{
/* Do a normal retry on the remaining components. */
startdir = fileport;
dealloc_dir = 1;
file_name = p + 1; /* Skip the slash. */
break;
}
}
else
goto bad_magic;
break;
case 'm':
if (retryname[1] == 'a' && retryname[2] == 'c' &&
retryname[3] == 'h' && retryname[4] == 't' &&
retryname[5] == 'y' && retryname[6] == 'p' &&
retryname[7] == 'e')
{
error_t err;
struct host_basic_info hostinfo;
mach_msg_type_number_t hostinfocnt = HOST_BASIC_INFO_COUNT;
char *p;
if (err = __host_info (__mach_host_self (), HOST_BASIC_INFO,
(natural_t *) &hostinfo,
&hostinfocnt))
return err;
if (hostinfocnt != HOST_BASIC_INFO_COUNT)
return EGRATUITOUS;
p = _itoa (hostinfo.cpu_subtype, &retryname[8], 10, 0);
*--p = '/';
p = _itoa (hostinfo.cpu_type, &retryname[8], 10, 0);
if (p < retryname)
abort (); /* XXX write this right if this ever happens */
if (p > retryname)
strcpy (retryname, p);
startdir = fileport;
dealloc_dir = 1;
}
else
goto bad_magic;
break;
case 't':
if (retryname[1] == 't' && retryname[2] == 'y')
switch (retryname[3])
{
error_t opentty (file_t *result)
{
error_t err;
file_t unauth;
err = __termctty_open_terminal
(_dl_hurd_data->portarray[INIT_PORT_CTTYID],
mode, &unauth);
if (! err)
{
mach_port_t ref = __mach_reply_port ();
err = __io_reauthenticate
(unauth, ref, MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = __auth_user_authenticate
(_dl_hurd_data->portarray[INIT_PORT_AUTH],
ref, MACH_MSG_TYPE_MAKE_SEND,
result);
__mach_port_deallocate (__mach_task_self (),
unauth);
__mach_port_destroy (__mach_task_self (), ref);
}
return err;
}
case '\0':
if (err = opentty (&fileport))
return err;
dealloc_dir = 1;
goto opened;
case '/':
if (err = opentty (&startdir))
return err;
dealloc_dir = 1;
strcpy (retryname, &retryname[4]);
break;
default:
goto bad_magic;
}
else
goto bad_magic;
break;
default:
bad_magic:
return EGRATUITOUS;
}
break;
default:
return EGRATUITOUS;
}
err = __dir_lookup (startdir, (char *)file_name, mode, 0,
&doretry, retryname, &fileport);
}
}
int weak_function
__open (const char *file_name, int mode, ...)
{
mach_port_t memobj_rd;
error_t err = open_file (file_name, mode, &memobj_rd, 0);
if (err)
return __hurd_fail (err);
else
return (int)memobj_rd;
}
int weak_function
__close (int fd)
{
if (fd != (int) MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), (mach_port_t) fd);
return 0;
}
caddr_t weak_function
__mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
{
error_t err;
vm_prot_t vmprot;
vm_address_t mapaddr;
vmprot = VM_PROT_NONE;
if (prot & PROT_READ)
vmprot |= VM_PROT_READ;
if (prot & PROT_WRITE)
vmprot |= VM_PROT_WRITE;
if (prot & PROT_EXEC)
vmprot |= VM_PROT_EXECUTE;
mapaddr = (vm_address_t) addr;
err = __vm_map (__mach_task_self (),
&mapaddr, (vm_size_t) len, 0 /*ELF_MACHINE_USER_ADDRESS_MASK*/,
!(flags & MAP_FIXED),
(flags & MAP_ANON) ? MACH_PORT_NULL : (mach_port_t) fd,
(vm_offset_t) offset,
flags & (MAP_COPY|MAP_PRIVATE),
vmprot, VM_PROT_ALL,
(flags & MAP_SHARED) ? VM_INHERIT_SHARE : VM_INHERIT_COPY);
if (err == KERN_NO_SPACE && (flags & MAP_FIXED))
{
/* XXX this is not atomic as it is in unix! */
/* The region is already allocated; deallocate it first. */
err = __vm_deallocate (__mach_task_self (), mapaddr, len);
if (! err)
err = __vm_map (__mach_task_self (),
&mapaddr, (vm_size_t) len, 0 /*ELF_MACHINE_USER_ADDRESS_MASK*/,
!(flags & MAP_FIXED),
(mach_port_t) fd, (vm_offset_t) offset,
flags & (MAP_COPY|MAP_PRIVATE),
vmprot, VM_PROT_ALL,
(flags & MAP_SHARED)
? VM_INHERIT_SHARE : VM_INHERIT_COPY);
}
return err ? (caddr_t) __hurd_fail (err) : (caddr_t) mapaddr;
}
void weak_function
_exit (int status)
{
__proc_mark_exit (_dl_hurd_data->portarray[INIT_PORT_PROC],
W_EXITCODE (status, 0), 0);
while (__task_terminate (__mach_task_self ()))
__mach_task_self_ = (__mach_task_self) ();
}
/* Read the whole contents of FILE into new mmap'd space with given
protections. The size of the file is returned in SIZE. */
void *
_dl_sysdep_read_whole_file (const char *file, size_t *size, int prot)
{
struct stat stat;
mach_port_t memobj_rd;
void *contents;
error_t err = open_file (file, O_RDONLY, &memobj_rd, &stat);
if (! err)
{
/* Map a copy of the file contents. */
contents = __mmap (0, stat.st_size, prot, MAP_COPY, memobj_rd, 0);
if (contents == (void *)-1)
contents = 0;
else
*size = stat.st_size;
__mach_port_deallocate (__mach_task_self (), memobj_rd);
}
else
{
__hurd_fail (err);
contents = 0;
}
return contents;
}
/* This function is called by interruptible RPC stubs. For initial
dynamic linking, just use the normal mach_msg. Since this defn is
weak, the real defn in libc.so will override it if we are linked into
the user program (-ldl). */
error_t weak_function
_hurd_intr_rpc_mach_msg (mach_msg_header_t *msg,
mach_msg_option_t option,
mach_msg_size_t send_size,
mach_msg_size_t rcv_size,
mach_port_t rcv_name,
mach_msg_timeout_t timeout,
mach_port_t notify)
{
return __mach_msg (msg, option, send_size, rcv_size, rcv_name,
timeout, notify);
}