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Wed May 10 21:00:47 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

Browse Source 
* sysdeps/mach/i386/sysdep.h (RETURN_TO): New macro.

	* Makerules (install-lib.so): Add %.so for each %_pic.a.

	* sysdeps/mach/hurd/i386/init-first.c: New file.
This commit is contained in:
Roland McGrath 1995-05-11 01:02:23 +00:00
parent 87220b3563
commit 99b306dc44
5 changed files with 763 additions and 155 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ChangeLog
View File

@ -1,5 +1,11 @@
Wed May 10 21:00:47 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* sysdeps/mach/i386/sysdep.h (RETURN_TO): New macro.
Tue May 9 01:26:52 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* Makerules (install-lib.so): Add %.so for each %_pic.a.
* sysdeps/i386/elf/start.S (__data_start): Define this symbol as
the first thing in .data.
@ -108,6 +114,7 @@ Tue May 2 01:52:58 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>
* sysdeps/i386/elf/start.S: New file.
* sysdeps/generic/dl-sysdep.c: New file.
* sysdeps/mach/hurd/dl-sysdep.c: New file.
* sysdeps/mach/hurd/i386/init-first.c: New file.
* sysdeps/i386/init-first.c: New file.
* sysdeps/stub/init-first.c: New file.

240
hurd/hurdstartup.c
View File

@ -26,8 +26,10 @@ Cambridge, MA 02139, USA. */
#include <sysdep.h>
#include <hurd/threadvar.h>
#include <unistd.h>
#include <elf.h>
#include "set-hooks.h"
#include "hurdmalloc.h" /* XXX */
#include "hurdstartup.h"
mach_port_t *_hurd_init_dtable;
mach_msg_type_number_t _hurd_init_dtablesize;
@ -41,39 +43,10 @@ unsigned long int __hurd_sigthread_stack_base;
unsigned long int __hurd_sigthread_stack_end;
unsigned long int *__hurd_sigthread_variables;
vm_address_t _hurd_stack_base;
vm_size_t _hurd_stack_size;
/* Things that want to be run before _hurd_init or much anything else.
Importantly, these are called before anything tries to use malloc. */
DEFINE_HOOK (_hurd_preinit_hook, (void));
extern void __mach_init (void);
extern void __libc_init (int argc, char **argv, char **envp);
void *(*_cthread_init_routine) (void); /* Returns new SP to use. */
void (*_cthread_exit_routine) (int status) __attribute__ ((__noreturn__));
int _hurd_split_args (char *, size_t, char **);
/* These communicate values from _hurd_startup to start1,
where we cannot use the stack for anything. */
struct info
{
char *args, *env;
mach_port_t *portarray;
int *intarray;
mach_msg_type_number_t argslen, envlen, portarraysize, intarraysize;
int flags;
char **argv, **envp;
int argc;
void (*hurd_main) (int, char **, char **,
mach_port_t *, mach_msg_type_number_t,
int *, mach_msg_type_number_t);
};
static void start1 (struct info *) __attribute__ ((__noreturn__));
/* Entry point. This is the first thing in the text segment.
@ -92,25 +65,22 @@ static void start1 (struct info *) __attribute__ ((__noreturn__));
This is unfortunate but preferable to machine-dependent frobnication to copy
the state from the old stack to the new one. */
void
_hurd_startup (void **argptr,
void (*main) (int, char **, char **,
mach_port_t *, mach_msg_type_number_t,
int *, mach_msg_type_number_t))
_hurd_startup (void **argptr, void (*main) (int *data))
{
error_t err;
mach_port_t in_bootstrap;
struct info i;
char *args, *env;
mach_msg_type_number_t argslen, envlen;
struct hurd_startup_data data;
char **argv, **envp;
int argc, envc;
int *argcptr;
/* Basic Mach initialization, must be done before RPCs can be done. */
__mach_init ();
/* Run things that want to do initialization as soon as possible. We do
this before exec_startup so that no out of line data arrives and
clutters up the address space before brk initialization. */
RUN_HOOK (_hurd_preinit_hook, ());
if (err = __task_get_special_port (__mach_task_self (), TASK_BOOTSTRAP_PORT,
&in_bootstrap))
LOSE;
@ -120,153 +90,113 @@ _hurd_startup (void **argptr,
/* Call the exec server on our bootstrap port and
get all our standard information from it. */
i.argslen = i.envlen = 0;
_hurd_init_dtablesize = i.portarraysize = i.intarraysize = 0;
argslen = envlen = 0;
data.dtablesize = data.portarraysize = data.intarraysize = 0;
err = __exec_startup (in_bootstrap,
&_hurd_stack_base, &_hurd_stack_size,
&i.flags,
&i.args, &i.argslen, &i.env, &i.envlen,
&_hurd_init_dtable, &_hurd_init_dtablesize,
&i.portarray, &i.portarraysize,
&i.intarray, &i.intarraysize);
&data.stack_base, &data.stack_size,
&data.flags, &args, &argslen, &env, &envlen,
&data.dtable, &data.dtablesize,
&data.portarray, &data.portarraysize,
&data.intarray, &data.intarraysize);
__mach_port_deallocate (__mach_task_self (), in_bootstrap);
}
if (err || in_bootstrap == MACH_PORT_NULL)
{
#if 0
/* Either we have no bootstrap port, or the RPC to the exec server
failed. Try to snarf the args in the canonical Mach way.
Hopefully either they will be on the stack as expected, or the
stack will be zeros so we don't crash. Set all our other
variables to have empty information. */
ENTRY_SP (argptr);
/* SNARF_ARGS (ARGPTR, ARGC, ARGV, ENVP) snarfs the arguments and
environment from the stack, assuming they were put there by the
microkernel. */
SNARF_ARGS (argptr, i.argc, i.argv, i.envp);
XXX XXX XXX
SNARF_ARGS (argptr, argc, argv, envp);
#endif
i.flags = 0;
i.args = i.env = NULL;
i.argslen = i.envlen = 0;
_hurd_init_dtable = NULL;
_hurd_init_dtablesize = 0;
i.portarray = NULL;
i.portarraysize = 0;
i.intarray = NULL;
i.intarraysize = 0;
data.flags = 0;
args = env = NULL;
argslen = envlen = 0;
data.dtable = NULL;
data.dtablesize = 0;
data.portarray = NULL;
data.portarraysize = 0;
data.intarray = NULL;
data.intarraysize = 0;
}
else
i.argv = i.envp = NULL;
i.hurd_main = main;
/* The user might have defined a value for this, to get more variables.
Otherwise it will be zero on startup. We must make sure it is set
properly before before cthreads initialization, so cthreads can know
how much space to leave for thread variables. */
if (__hurd_threadvar_max < _HURD_THREADVAR_MAX)
__hurd_threadvar_max = _HURD_THREADVAR_MAX;
/* Do cthreads initialization and switch to the cthread stack. */
if (_cthread_init_routine != NULL)
CALL_WITH_SP (start1, i, (*_cthread_init_routine) ());
else
start1 (&i);
/* Should never get here. */
LOSE;
}
static void
start1 (struct info *info)
{
register int envc = 0;
{
/* Check if the stack we are now on is different from
the one described by _hurd_stack_{base,size}. */
char dummy;
const vm_address_t newsp = (vm_address_t) &dummy;
if (_hurd_stack_size != 0 && (newsp < _hurd_stack_base ||
newsp - _hurd_stack_base > _hurd_stack_size))
/* The new stack pointer does not intersect with the
stack the exec server set up for us, so free that stack. */
__vm_deallocate (__mach_task_self (),
_hurd_stack_base, _hurd_stack_size);
}
if (__hurd_threadvar_stack_mask == 0)
{
/* We are not using cthreads, so we will have just a single allocated
area for the per-thread variables of the main user thread. */
unsigned long int i;
__hurd_threadvar_stack_offset
= (unsigned long int) malloc (__hurd_threadvar_max *
sizeof (unsigned long int));
if (__hurd_threadvar_stack_offset == 0)
__libc_fatal ("Can't allocate single-threaded per-thread variables.");
for (i = 0; i < __hurd_threadvar_max; ++i)
((unsigned long int *) __hurd_threadvar_stack_offset)[i] = 0;
}
argv = envp = NULL;
/* Turn the block of null-separated strings we were passed for the
arguments and environment into vectors of pointers to strings. */
if (! info->argv)
{
if (info->args)
/* Count up the arguments so we can allocate ARGV. */
info->argc = _hurd_split_args (args, argslen, NULL);
if (! info->args || info->argc == 0)
{
/* No arguments passed; set argv to { NULL }. */
info->argc = 0;
info->args = NULL;
info->argv = (char **) &info->args;
}
}
if (! info->envp)
{
if (info->env)
/* Count up the environment variables so we can allocate ENVP. */
envc = _hurd_split_args (info->env, info->envlen, NULL);
if (! info->env || envc == 0)
{
/* No environment passed; set __environ to { NULL }. */
info->env = NULL;
info->envp = (char **) &env;
}
}
if (! info->argv)
{
/* There were some arguments.
Allocate space for the vectors of pointers and fill them in. */
info->argv = __alloca ((info->argc + 1) * sizeof (char *));
_hurd_split_args (info->args, info->argslen, info->argv);
}
if (! info->envp)
if (! argv)
{
/* There was some environment.
Allocate space for the vectors of pointers and fill them in. */
info->envp = __alloca ((envc + 1) * sizeof (char *));
_hurd_split_args (info->env, info->envlen, info->envp);
/* Count up the arguments so we can allocate ARGV. */
argc = _hurd_split_args (args, argslen, NULL);
/* Count up the environment variables so we can allocate ENVP. */
envc = _hurd_split_args (env, envlen, NULL);
/* There were some arguments. Allocate space for the vectors of
pointers and fill them in. We allocate the space for the
environment pointers immediately after the argv pointers because
the ELF ABI will expect it. */
argcptr = __alloca (sizeof (int) +
(argc + 1 + envc + 1) * sizeof (char *) +
sizeof (struct hurd_startup_data));
*argcptr = argc;
argv = (void *) (argcptr + 1);
_hurd_split_args (args, argslen, argv);
/* There was some environment. */
envp = &argv[argc + 1];
_hurd_split_args (env, envlen, envp);
}
(*info->hurd_main) (info->argc, info->argv, info->envp,
info->portarray, info->portarraysize,
info->intarray, info->intarraysize);
{
struct hurd_startup_data *d = (void *) &envp[envc + 1];
/* XXX hardcoded until exec_startup changes */
#ifdef PIC
#if 0
const Elf32_Ehdr *ehdr = (const void *) 0x08000000;
vm_address_t phdr = 0x08000000 + ehdr->e_phoff;
vm_size_t phdrsz = ehdr->e_phnum * ehdr->e_phentsize;
vm_address_t user_entry = ehdr->e_entry;
#else
vm_address_t phdr = 0;
vm_size_t phdrsz = 0;
extern void _start();
vm_address_t user_entry = (vm_address_t) &_start;
#endif
#else
vm_address_t phdr = 0;
vm_size_t phdrsz = 0;
vm_address_t user_entry = 0;
#endif
*d = data;
_hurd_init_dtable = d->dtable;
_hurd_init_dtablesize = d->dtablesize;
d->phdr = phdr;
d->phdrsz = phdrsz;
d->user_entry = user_entry;
(*main) (argcptr);
}
/* Should never get here. */
LOSE;
abort ();
}
/* Split ARGSLEN bytes at ARGS into words, breaking at NUL characters. If

494
sysdeps/mach/hurd/dl-sysdep.c Normal file
View File

@ -0,0 +1,494 @@
/* Operating system support for run-time dynamic linker. Hurd version.
Copyright (C) 1995 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/_itoa.h"
#include <hurd/auth.h>
#include <hurd/term.h>
#include <stdarg.h>
#include "dl-machine.h"
extern int _dl_argc;
extern char **_dl_argv;
extern char **_environ;
struct hurd_startup_data *_dl_hurd_data;
Elf32_Addr
_dl_sysdep_start (void **start_argptr,
void (*dl_main) (const Elf32_Phdr *phdr, Elf32_Word phent,
Elf32_Addr *user_entry))
{
void go (int *argdata)
{
char **p;
/* Cache the information in various global variables. */
_dl_argc = *argdata++;
_dl_argv = (void *) argdata;
_environ = &_dl_argv[_dl_argc + 1];
for (p = _environ; *p; ++p);
_dl_hurd_data = (void *) ++p;
_dl_secure = _dl_hurd_data->flags & EXEC_SECURE;
/* 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);
{
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);
}
}
/* 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;
}
/* This is called when all other dynamic linking is finished, before the
dynamic linker re-relocates itself when ld.so itself appears in a
DT_NEEDED entry. It is called whether of not ld.so is being linked in.
We take this opportunity to deallocate the reply port and task-self send
right user reference we have acquired, since they will not be used again
before the library and user code runs. The C library will acquire its
own ports in its initialization. */
void
_dl_sysdep_prepare_for_ld_reloc (void)
{
__mig_dealloc_reply_port (__mig_get_reply_port ());
__mach_port_deallocate (__mach_task_self (), __mach_task_self ());
}
int
_dl_sysdep_open_zero_fill (void)
{
return (int) MACH_PORT_NULL;
}
void
_dl_sysdep_fatal (const char *msg, ...)
{
extern __typeof (__io_write) __hurd_intr_rpc_io_write;
va_list ap;
va_start (ap, msg);
do
{
size_t len = strlen (msg);
mach_msg_type_number_t nwrote;
do
{
if (__hurd_intr_rpc_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);
}
/* 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). */
int
open (const char *file_name, int mode, ...)
{
extern __typeof (__dir_lookup) __hurd_intr_rpc_dir_lookup;
extern __typeof (__io_reauthenticate) __hurd_intr_rpc_io_reauthenticate;
enum retry_type doretry;
char retryname[1024]; /* XXX string_t LOSES! */
file_t startdir, newpt, fileport;
int dealloc_dir;
int nloops;
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 (errno = __hurd_intr_rpc_dir_lookup (startdir, file_name, mode, 0,
&doretry, retryname, &fileport))
return -1;
dealloc_dir = 0;
nloops = 0;
errno = 0;
while (1)
{
if (dealloc_dir)
__mach_port_deallocate (__mach_task_self (), startdir);
if (errno)
return -1;
switch (doretry)
{
case FS_RETRY_REAUTH:
{
mach_port_t ref = __mach_reply_port ();
errno = __hurd_intr_rpc_io_reauthenticate
(fileport, ref, MACH_MSG_TYPE_MAKE_SEND);
if (! errno)
errno = __auth_user_authenticate
(_dl_hurd_data->portarray[INIT_PORT_AUTH],
fileport,
ref, MACH_MSG_TYPE_MAKE_SEND,
&newpt);
__mach_port_destroy (__mach_task_self (), ref);
}
__mach_port_deallocate (__mach_task_self (), fileport);
if (errno)
return -1;
fileport = newpt;
/* Fall through. */
case FS_RETRY_NORMAL:
#ifdef SYMLOOP_MAX
if (nloops++ >= SYMLOOP_MAX)
{
errno = ELOOP;
return -1;
}
#endif
/* An empty RETRYNAME indicates we have the final port. */
if (retryname[0] == '\0')
{
mach_port_t memobj_rd, memobj_wr;
extern __typeof (__io_map) __hurd_intr_rpc_io_map;
dealloc_dir = 1;
opened:
/* We have the file open. Now map it. */
errno = __hurd_intr_rpc_io_map (fileport,
&memobj_rd, &memobj_wr);
if (dealloc_dir)
__mach_port_deallocate (__mach_task_self (), fileport);
if (errno)
return -1;
if (memobj_wr != MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), memobj_wr);
return (int) memobj_rd;
}
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] == '/')
{
int fd;
char *end;
errno = 0;
fd = (int) strtol (retryname, &end, 10);
if (end == NULL || errno || /* Malformed number. */
/* Check for excess text after the number. A slash
is valid; it ends the component. Anything else
does not name a numeric file descriptor. */
(*end != '/' && *end != '\0'))
{
errno = ENOENT;
return -1;
}
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. */
errno = EBADF;
return -1;
}
fileport = _dl_hurd_data->dtable[fd];
if (*end == '\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 = end + 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 = __hurd_intr_rpc_io_reauthenticate
(unauth, ref, MACH_MSG_TYPE_MAKE_SEND);
if (! err)
err = __auth_user_authenticate
(_dl_hurd_data->portarray[INIT_PORT_AUTH],
unauth,
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 (errno = opentty (&fileport))
return -1;
dealloc_dir = 1;
goto opened;
case '/':
if (errno = opentty (&startdir))
return -1;
dealloc_dir = 1;
strcpy (retryname, &retryname[4]);
break;
default:
goto bad_magic;
}
else
goto bad_magic;
break;
default:
bad_magic:
errno = EGRATUITOUS;
return -1;
}
break;
default:
errno = EGRATUITOUS;
return -1;
}
errno = __hurd_intr_rpc_dir_lookup (startdir, file_name, mode, 0,
&doretry, retryname, &fileport);
}
}
int
close (int fd)
{
if (fd != (int) MACH_PORT_NULL)
__mach_port_deallocate (__mach_task_self (), (mach_port_t) fd);
return 0;
}
caddr_t
mmap (caddr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
{
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;
errno = __vm_map (__mach_task_self (),
&mapaddr, (vm_size_t) len, (vm_address_t) 0,
!(flags & MAP_FIXED),
(mach_port_t) fd, (vm_offset_t) offset,
flags & (MAP_COPY|MAP_PRIVATE),
vmprot, VM_PROT_ALL,
(flags & MAP_INHERIT) ? VM_INHERIT_COPY : VM_INHERIT_NONE);
return errno ? (caddr_t) -1 : (caddr_t) mapaddr;
}
void
_exit (int status)
{
extern __typeof (__proc_mark_exit) __hurd_intr_rpc_proc_mark_exit;
__hurd_intr_rpc_proc_mark_exit (_dl_hurd_data->portarray[INIT_PORT_PROC],
W_EXITCODE (status, 0));
while (__task_terminate (__mach_task_self ()))
__mach_task_self_ = (__mach_task_self) ();
}
weak_symbol (_exit)
weak_symbol (open)
weak_symbol (close)
weak_symbol (mmap)
/* Minimal `malloc' allocator for use while loading shared libraries.
Only small blocks are allocated, and none are ever freed. */
void *
malloc (size_t n)
{
static vm_address_t ptr, end;
void *block;
if (end == 0)
{
/* Consume any unused space in the last page of our data segment. */
extern char _end;
ptr = (vm_address_t) &_end;
end = round_page (ptr);
}
/* Make sure the allocation pointer is ideally aligned. */
ptr += sizeof (double) - 1;
ptr &= ~(sizeof (double) - 1);
if (ptr + n >= end)
{
/* Insufficient space left; allocate another page. */
vm_address_t page;
assert (n <= __vm_page_size);
__vm_allocate (__mach_task_self (), &page, __vm_page_size, 1);
if (page != end)
ptr = page;
end = page + __vm_page_size;
}
block = (void *) ptr;
ptr += n;
return block;
}
weak_symbol (malloc)
/* These should never be called. */
void *realloc (void *ptr, size_t n) { ptr += n; abort (); }
void free (void *ptr) { ptr = ptr; abort (); }
weak_symbol (realloc)
weak_symbol (free)
/* Avoid signal frobnication in setjmp/longjmp. */
int __sigjmp_save (sigjmp_buf env, int savemask)
{ env[0].__mask_was_saved = savemask; return 0; }
weak_symbol (__sigjmp_save)
void
longjmp (jmp_buf env, int val) { __longjmp (env[0].__jmpbuf, val); }
weak_symbol (longjmp)
/* Stub out this function that is called by interruptible RPC stubs. It
should never get called during initial dynamic linking, because we use
only the raw MiG stub functions __hurd_intr_rpc_*. Since this defn is
weak, the real defn in libc.so will override it if we are linked into
the user program (-ldl). */
struct hurd_sigstate *
_hurd_thread_sigstate (thread_t thread) { thread = thread; abort (); }
weak_symbol (_hurd_thread_sigstate)

172
sysdeps/mach/hurd/i386/init-first.c Normal file
View File

@ -0,0 +1,172 @@
/* Initialization code run first thing by the ELF startup code. For i386/Hurd.
Copyright (C) 1995 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 <stdio.h>
#include <unistd.h>
#include "hurdstartup.h"
#include "set-hooks.h"
#include "hurdmalloc.h" /* XXX */
extern void __mach_init (void);
extern void __libc_init (int, char **, char **);
void *(*_cthread_init_routine) (void); /* Returns new SP to use. */
void (*_cthread_exit_routine) (int status) __attribute__ ((__noreturn__));
/* Things that want to be run before _hurd_init or much anything else.
Importantly, these are called before anything tries to use malloc. */
DEFINE_HOOK (_hurd_preinit_hook, (void));
static void
init1 (int argc, char *arg0, ...)
{
char **argv = &arg0;
char **envp = &argv[argc + 1];
struct hurd_startup_data *d;
__environ = envp;
while (*envp)
++envp;
d = (void *) ++envp;
/* If we are the bootstrap task started by the kernel,
then after the environment pointers there is no Hurd
data block; the argument strings start there. */
if ((void *) d != argv[0])
{
_hurd_init_dtable = d->dtable;
_hurd_init_dtablesize = d->dtablesize;
{
/* Check if the stack we are now on is different from
the one described by _hurd_stack_{base,size}. */
char dummy;
const vm_address_t newsp = (vm_address_t) &dummy;
if (d->stack_size != 0 && (newsp < d->stack_base ||
newsp - d->stack_base > d->stack_size))
/* The new stack pointer does not intersect with the
stack the exec server set up for us, so free that stack. */
__vm_deallocate (__mach_task_self (), d->stack_base, d->stack_size);
}
}
if (__hurd_threadvar_stack_mask == 0)
{
/* We are not using cthreads, so we will have just a single allocated
area for the per-thread variables of the main user thread. */
unsigned long int i;
__hurd_threadvar_stack_offset
= (unsigned long int) malloc (__hurd_threadvar_max *
sizeof (unsigned long int));
if (__hurd_threadvar_stack_offset == 0)
__libc_fatal ("Can't allocate single-threaded per-thread variables.");
for (i = 0; i < __hurd_threadvar_max; ++i)
((unsigned long int *) __hurd_threadvar_stack_offset)[i] = 0;
}
if ((void *) d != argv[0] && (d->portarray || d->intarray))
/* Initialize library data structures, start signal processing, etc. */
_hurd_init (d->flags, argv,
d->portarray, d->portarraysize,
d->intarray, d->intarraysize);
__libc_init (argc, argv, __environ);
}
static void
init (int *data, int retaddr)
{
int argc = *data;
char **argv = (void *) (data + 1);
char **envp = &argv[argc + 1];
struct hurd_startup_data *d;
__environ = envp;
while (*envp)
++envp;
d = (void *) ++envp;
/* The user might have defined a value for this, to get more variables.
Otherwise it will be zero on startup. We must make sure it is set
properly before before cthreads initialization, so cthreads can know
how much space to leave for thread variables. */
if (__hurd_threadvar_max < _HURD_THREADVAR_MAX)
__hurd_threadvar_max = _HURD_THREADVAR_MAX;
if (_cthread_init_routine)
{
/* Initialize cthreads, which will allocate us a new stack to run on. */
void *newsp = (*_cthread_init_routine) ();
/* Copy the argdata from the old stack to the new one. */
newsp = memcpy (newsp - ((char *) &d[1] - (char *) data), data,
(char *) &d[1] - (char *) data);
data = newsp;
}
/* Call `init1' (above) with the user code as the return address,
and the argument data immediately above that on the stack. */
*--data = retaddr;
asm volatile ("movl %0, %%esp; jmp %*%1" : : "g" (data), "r" (&init1));
}
#ifdef PIC
/* This function is called to initialize the shared C library.
It is called just before the user _start code from i386/elf/start.S,
with the stack set up as that code gets it. */
static void soinit (int argc, ...) __attribute__ ((unused, section (".init")));
static void
soinit (int argc, ...)
{
/* Initialize data structures so we can do RPCs. */
__mach_init ();
RUN_HOOK (_hurd_preinit_hook, ());
init (&argc, (&argc)[-1]);
(void) &soinit; /* Avoid gcc optimizing this fn out. */
}
#endif
void
__libc_init_first (int argc, ...)
{
#ifndef PIC
void doinit (int *data)
{
init (data, (&argc)[-1]);
}
/* Initialize data structures so we can do RPCs. */
__mach_init ();
RUN_HOOK (_hurd_preinit_hook, ());
_hurd_startup ((void **) &argc, &doinit);
#endif
}

5
sysdeps/mach/i386/sysdep.h
View File

@ -44,6 +44,11 @@ Cambridge, MA 02139, USA. */
"g" (ptr), "m" (*(long int *) (fn)) : "%esp"); \
} while (0)
#define RETURN_TO(sp, pc, retval) \
asm volatile ("movl %0, %%esp; jmp %*%1 # %2" \
: : "g" (sp), "r" (pc), "a" (retval))
#define STACK_GROWTH_DOWN
#include_next <sysdep.h>