1 /* Initial program startup for running under the GNU Hurd.
2 Copyright (C) 1991, 92, 93, 94, 95, 96, 97 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
25 #include <hurd/exec_startup.h>
27 #include <hurd/threadvar.h>
30 #include "set-hooks.h"
31 #include "hurdmalloc.h" /* XXX */
32 #include "hurdstartup.h"
35 mach_port_t *_hurd_init_dtable;
36 mach_msg_type_number_t _hurd_init_dtablesize;
38 unsigned int __hurd_threadvar_max;
39 unsigned long int __hurd_threadvar_stack_mask;
40 unsigned long int __hurd_threadvar_stack_offset;
42 /* These are set up by _hurdsig_init. */
43 unsigned long int __hurd_sigthread_stack_base;
44 unsigned long int __hurd_sigthread_stack_end;
45 unsigned long int *__hurd_sigthread_variables;
47 extern void __mach_init (void);
49 /* Entry point. This is the first thing in the text segment.
51 The exec server started the initial thread in our task with this spot the
52 PC, and a stack that is presumably big enough. We do basic Mach
53 initialization so mig-generated stubs work, and then do an exec_startup
54 RPC on our bootstrap port, to which the exec server responds with the
55 information passed in the exec call, as well as our original bootstrap
56 port, and the base address and size of the preallocated stack.
58 If using cthreads, we are given a new stack by cthreads initialization and
59 deallocate the stack set up by the exec server. On the new stack we call
60 `start1' (above) to do the rest of the startup work. Since the stack may
61 disappear out from under us in a machine-dependent way, we use a pile of
62 static variables to communicate the information from exec_startup to start1.
63 This is unfortunate but preferable to machine-dependent frobnication to copy
64 the state from the old stack to the new one. */
68 _hurd_startup (void **argptr, void (*main) (int *data))
71 mach_port_t in_bootstrap;
73 mach_msg_type_number_t argslen, envlen;
74 struct hurd_startup_data data;
80 /* Attempt to map page zero redzoned before we receive any RPC
81 data that might get allocated there. We can ignore errors. */
83 __vm_map (__mach_task_self (),
84 &addr, __vm_page_size, 0, 0, MACH_PORT_NULL, 0, 1,
85 VM_PROT_NONE, VM_PROT_NONE, VM_INHERIT_COPY);
87 if (err = __task_get_special_port (__mach_task_self (), TASK_BOOTSTRAP_PORT,
91 if (in_bootstrap != MACH_PORT_NULL)
93 /* Call the exec server on our bootstrap port and
94 get all our standard information from it. */
97 data.dtablesize = data.portarraysize = data.intarraysize = 0;
99 err = __exec_startup_get_info (in_bootstrap,
101 &data.phdr, &data.phdrsz,
102 &data.stack_base, &data.stack_size,
106 &data.dtable, &data.dtablesize,
107 &data.portarray, &data.portarraysize,
108 &data.intarray, &data.intarraysize);
109 __mach_port_deallocate (__mach_task_self (), in_bootstrap);
112 if (err || in_bootstrap == MACH_PORT_NULL || (data.flags & EXEC_STACK_ARGS))
114 /* Either we have no bootstrap port, or the RPC to the exec server
115 failed, or whoever started us up passed the flag saying args are
116 on the stack. Try to snarf the args in the canonical Mach way.
117 Hopefully either they will be on the stack as expected, or the
118 stack will be zeros so we don't crash. */
120 argcptr = (int *) argptr;
122 argv = (char **) &argcptr[1];
123 envp = &argv[argc + 1];
130 /* Turn the block of null-separated strings we were passed for the
131 arguments and environment into vectors of pointers to strings. */
133 /* Count up the arguments so we can allocate ARGV. */
134 argc = __argz_count (args, argslen);
135 /* Count up the environment variables so we can allocate ENVP. */
136 envc = __argz_count (env, envlen);
138 /* There were some arguments. Allocate space for the vectors of
139 pointers and fill them in. We allocate the space for the
140 environment pointers immediately after the argv pointers because
141 the ELF ABI will expect it. */
142 argcptr = __alloca (sizeof (int) +
143 (argc + 1 + envc + 1) * sizeof (char *) +
144 sizeof (struct hurd_startup_data));
146 argv = (void *) (argcptr + 1);
147 __argz_extract (args, argslen, argv);
149 /* There was some environment. */
150 envp = &argv[argc + 1];
151 __argz_extract (env, envlen, envp);
154 if (err || in_bootstrap == MACH_PORT_NULL)
156 /* Either we have no bootstrap port, or the RPC to the exec server
157 failed. Set all our other variables to have empty information. */
161 argslen = envlen = 0;
164 data.portarray = NULL;
165 data.portarraysize = 0;
166 data.intarray = NULL;
167 data.intarraysize = 0;
169 else if ((void *) &envp[envc + 1] == argv[0])
171 /* The arguments arrived on the stack from the kernel, but our
172 protocol requires some space after them for a `struct
173 hurd_startup_data'. Move them. */
177 char *argv[argc + 1];
178 char *envp[envc + 1];
179 struct hurd_startup_data data;
180 } *args = alloca (sizeof *args);
181 if ((void *) &args[1] == (void *) argcptr)
182 args = alloca (-((char *) &args->data - (char *) args));
183 memmove (args, argcptr, (char *) &args->data - (char *) args);
184 argcptr = (void *) args;
190 struct hurd_startup_data *d = (void *) &envp[envc + 1];
192 if ((void *) d != argv[0])
195 _hurd_init_dtable = d->dtable;
196 _hurd_init_dtablesize = d->dtablesize;
202 /* Should never get here. */