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Diffstat (limited to 'sysdeps/mach/hurd/alpha/init-first.c')
| -rw-r--r-- | sysdeps/mach/hurd/alpha/init-first.c | 304 |
1 files changed, 304 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/alpha/init-first.c b/sysdeps/mach/hurd/alpha/init-first.c new file mode 100644 index 0000000000..bb60cd07d2 --- /dev/null +++ b/sysdeps/mach/hurd/alpha/init-first.c @@ -0,0 +1,304 @@ +/* Initialization code run first thing by the ELF startup code. Alpha/Hurd. + Copyright (C) 1995,96,97,98,99,2000,2001,02 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 Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <assert.h> +#include <hurd.h> +#include <stdio.h> +#include <unistd.h> +#include <string.h> +#include <sysdep.h> +#include <set-hooks.h> +#include "hurdstartup.h" +#include "hurdmalloc.h" /* XXX */ + +extern void __mach_init (void); +extern void __libc_init (int, char **, char **); +extern void __init_misc (int, char **, char **); +#ifdef USE_NONOPTION_FLAGS +extern void __getopt_clean_environment (char **); +#endif +#ifndef SHARED +extern void _dl_non_dynamic_init (void) internal_function; +#endif +extern void __libc_global_ctors (void); + +unsigned int __hurd_threadvar_max; +unsigned long int __hurd_threadvar_stack_offset; +unsigned long int __hurd_threadvar_stack_mask; + +#ifndef SHARED +int __libc_enable_secure; +#endif +int __libc_multiple_libcs attribute_hidden = 1; + +extern int __libc_argc attribute_hidden; +extern char **__libc_argv attribute_hidden; +extern char **_dl_argv; + +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)); + + +/* We call this once the Hurd magic is all set up and we are ready to be a + Posixoid program. This does the same things the generic version does. */ +static void +posixland_init (int argc, char **argv, char **envp) +{ + __libc_argc = argc; + __libc_argv = argv; + __environ = envp; + +#ifndef SHARED + _dl_non_dynamic_init (); +#endif + __init_misc (argc, argv, envp); + __libc_init (argc, argv, envp); + +#ifdef USE_NONOPTION_FLAGS + /* This is a hack to make the special getopt in GNU libc working. */ + __getopt_clean_environment (envp); +#endif + +#ifdef SHARED + __libc_global_ctors (); +#endif +} + + +static void +init1 (intptr_t *data) +{ + int argc = (intptr_t) *data; + char **argv = &data[1]; + char **envp = &argv[argc + 1]; + struct hurd_startup_data *d; + + 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. */ + /* OSF Mach starts the bootstrap task with argc == 0. + XXX This fails if a non-bootstrap task gets started + with argc == 0. */ + if (argc && (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 ((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); + +#ifndef SHARED + __libc_enable_secure = d->flags & EXEC_SECURE; +#endif +} + + +static inline void +init (int *data) +{ + int argc = *data; + char **argv = (void *) (data + 1); + char **envp = &argv[argc + 1]; + struct hurd_startup_data *d; + unsigned long int threadvars[_HURD_THREADVAR_MAX]; + + /* Provide temporary storage for thread-specific variables on the + startup stack so the cthreads initialization code can use them + for malloc et al, or so we can use malloc below for the real + threadvars array. */ + memset (threadvars, 0, sizeof threadvars); + __hurd_threadvar_stack_offset = (unsigned long int) threadvars; + + /* Since the cthreads initialization code uses malloc, and the + malloc initialization code needs to get at the environment, make + sure we can find it. We'll need to do this again later on since + switching stacks changes the location where the environment is + stored. */ + __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; + + + /* After possibly switching stacks, call `init1' (above) with the user + code as the return address, and the argument data immediately above + that on the stack. */ + + if (_cthread_init_routine) + { + /* Initialize cthreads, which will allocate us a new stack to run on. */ + void *newsp = (*_cthread_init_routine) (); + struct hurd_startup_data *od; + + void switch_stacks (void); + + /* Copy per-thread variables from that temporary + area onto the new cthread stack. */ + memcpy (__hurd_threadvar_location_from_sp (0, newsp), + threadvars, sizeof threadvars); + + /* Copy the argdata from the old stack to the new one. */ + newsp = memcpy (newsp - ((char *) &d[1] - (char *) data), data, + (char *) d - (char *) data); + +#ifdef SHARED + /* And readjust the dynamic linker's idea of where the argument + vector lives. */ + assert (_dl_argv == argv); + _dl_argv = (void *) ((int *) newsp + 1); +#endif + + /* Set up the Hurd startup data block immediately following + the argument and environment pointers on the new stack. */ + od = (newsp + ((char *) d - (char *) data)); + if ((void *) argv[0] == d) + /* We were started up by the kernel with arguments on the stack. + There is no Hurd startup data, so zero the block. */ + memset (od, 0, sizeof *od); + else + /* Copy the Hurd startup data block to the new stack. */ + *od = *d; + + /* + Force NEWSP into sp and &init1 into pv, then branch to pv (call init1). + */ + asm volatile ("lda $30,0(%0); lda $27,0(%1); jsr $26,($27)" + : : "r" (newsp), "r" (&init1)); + } + else + { + /* 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 *array; + unsigned int i; + + array = malloc (__hurd_threadvar_max * sizeof (unsigned long int)); + if (array == NULL) + __libc_fatal ("Can't allocate single-threaded thread variables."); + + /* Copy per-thread variables from the temporary array into the + newly malloc'd space. */ + memcpy (array, threadvars, sizeof threadvars); + __hurd_threadvar_stack_offset = (unsigned long int) array; + for (i = _HURD_THREADVAR_MAX; i < __hurd_threadvar_max; ++i) + array[i] = 0; + + init1 (data); + } +} + + +/* Do the first essential initializations that must precede all else. */ +static inline void +first_init (void) +{ + /* Initialize data structures so we can do RPCs. */ + __mach_init (); + + RUN_HOOK (_hurd_preinit_hook, ()); +} + +#ifdef SHARED +/* This function is called specially by the dynamic linker to do early + initialization of the shared C library before normal initializers + expecting a Posixoid environment can run. It gets called with the + stack set up just as the user will see it, so it can switch stacks. */ + +void +_dl_init_first (int argc, ...) +{ + first_init (); + + init (&argc); +} +#endif + + +#ifdef SHARED +/* The regular posixland initialization is what goes into libc's + normal initializer. */ +/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT + pointer in the dynamic section based solely on that. It is convention + for this function to be in the `.init' section, but the symbol name is + the only thing that really matters!! */ +strong_alias (posixland_init, _init); + +void +__libc_init_first (int argc, char **argv, char **envp) +{ + /* Everything was done in the shared library initializer, _init. */ +} +#else +strong_alias (posixland_init, __libc_init_first); + + +void +_hurd_stack_setup (volatile int argc, ...) +{ + first_init (); + + _hurd_startup ((void **) &argc, &init); +} +#endif + + +/* This function is defined here so that if this file ever gets into + ld.so we will get a link error. Having this file silently included + in ld.so causes disaster, because the _init definition above will + cause ld.so to gain an init function, which is not a cool thing. */ + +void +_dl_start (void) +{ + abort (); +} |