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