diff options
Diffstat (limited to 'sysdeps/unix/sysv/aix/start-libc.c')
| -rw-r--r-- | sysdeps/unix/sysv/aix/start-libc.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/aix/start-libc.c b/sysdeps/unix/sysv/aix/start-libc.c new file mode 100644 index 0000000000..e3582e3892 --- /dev/null +++ b/sysdeps/unix/sysv/aix/start-libc.c @@ -0,0 +1,271 @@ +/* Initialization code run first thing by the XCOFF startup code. AIX version. + Copyright (C) 2001 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 <stdlib.h> +#include <unistd.h> +#include <sys/types.h> + +/* hack to use uchar's */ +typedef unsigned char uchar; +#include <xcoff.h> +#include <rtinit.h> +#include <dlldr.h> +#include <bits/libc-lock.h> + +extern void __libc_init_first (int argc, char **argv, char **envp); + +/* XXX disable for now +extern int _dl_starting_up; +weak_extern (_dl_starting_up) +extern int __libc_multiple_libcs; */ + +/* XXX normally defined in generic/dl-sydep.c, hack it into existance +extern void *__libc_stack_end; */ +void *__libc_stack_end; + +struct __libc_start_data_rec +{ + void *stack; + void *toc; + int argc; + char **argv; + char **envp; + char *data; + char *text; + unsigned int mcount; + unsigned int special; + int (*main) (int, char **, char **); + void (*init) (void); + void (*fini) (void); + void (*rtld_fini) (void); +}; + +extern struct __libc_start_data_rec __libc_start_data; +extern int errno; + +/* The first piece of initialized data. */ +int __data_start = 0; + +#ifndef HAVE_ELF +/* Since gcc/crtstuff.c won't define it unless the ELF format is used + we will need to define it here. */ +void *__dso_handle = NULL; +#endif + +/* AIX kernel function */ +extern int __loadx (int flag, void *module, void *arg1, void *arg2, + void *arg3); +/* Needed by setenv */ +char **__environ; + +/* Needed by dl-support.c */ +/* XXX stubbing out dl-support.c for now.. + size_t _dl_pagesize = 0; */ + +/* + Find __rtinit symbol + + __RTINIT *find_rtinit() + + __RTINIT *rti - pointer to __rtinit data structure + */ + +static __RTINIT * +find_rtinit (void) +{ + struct xcoffhdr *xcoff_hdr; + SCNHDR *sec_hdr; + SCNHDR *ldr_sec_hdr; + SCNHDR *data_sec_hdr; + LDSYM *ldsym_hdr; + __RTINIT *rtl; + + xcoff_hdr = (struct xcoffhdr *) __libc_start_data.text; + sec_hdr = (SCNHDR *) ((caddr_t) &xcoff_hdr->aouthdr + + xcoff_hdr->filehdr.f_opthdr); + ldr_sec_hdr = (SCNHDR *) (sec_hdr + (xcoff_hdr->aouthdr.o_snloader - 1)); + ldsym_hdr = (LDSYM *) ((caddr_t)xcoff_hdr + ldr_sec_hdr->s_scnptr + + LDHDRSZ); + + if ( __libc_start_data.mcount <= 0) + { + if (!ldr_sec_hdr->s_scnptr) + return (__RTINIT *) 0; + + if (memcmp (ldsym_hdr, RTINIT_NAME, sizeof (RTINIT_NAME) - 1)) + return (__RTINIT *) 0; + } + + data_sec_hdr = (SCNHDR *) (sec_hdr + (xcoff_hdr->aouthdr.o_sndata - 1)); + rtl = (__RTINIT *) (ldsym_hdr->l_value + + (__libc_start_data.data - data_sec_hdr->s_vaddr)); + return rtl; +} + +/* + The mod_init1 calls every initialization function for a given module. + + void mod_init1(handler, rti) + + void *handler - if NULL init funtions for modules loaded at exec time + are being executed. Otherwise, the handler points to the + module loaded. + + __RTINIT *rti - pointer to __rtinit data structure (with rti->init_offset + not equal to zero) + */ + +static void +mod_init1 (void *handler,__RTINIT *rtl) +{ + __RTINIT_DESCRIPTOR *descriptor; + + descriptor = (__RTINIT_DESCRIPTOR *) ((caddr_t) &rtl->rtl + + rtl->init_offset); + while (descriptor->f != NULL) + { + if (!(descriptor->flags & _RT_CALLED)) + { + descriptor->flags |= _RT_CALLED; + (descriptor->f) (handler, rtl, descriptor); /* execute init/fini */ + } + descriptor = (__RTINIT_DESCRIPTOR *) ((caddr_t) descriptor + + rtl->__rtinit_descriptor_size); + } +} + +/* The modinit() function performs run-time linking, if enabled, and calling + the init() function for all loaded modules. */ + +#define DL_BUFFER_SIZE 1000 + +static int +modinit (void) +{ + int *handler = 0; + __RTINIT *rtinit_info = 0; + int flag; + DL_INFO dl_buffer[DL_BUFFER_SIZE]; + DL_INFO *dl_info = dl_buffer; + int i; + + /* Find __rtinit symbols */ + rtinit_info = find_rtinit (); + + flag = DL_EXECQ; + if (rtinit_info && rtinit_info->rtl) + flag |= DL_LOAD_RTL; + + /* Get a list of modules that have __rtinit */ + if (__loadx (flag, dl_info, (void *) sizeof (dl_buffer), NULL, NULL)) + exit (0x90); + + if (dl_info[0].dlinfo_xflags & DL_INFO_OK) + { + rtinit_info = find_rtinit (); + if ((rtinit_info != NULL) & (rtinit_info->rtl != NULL)) + { + if ((*rtinit_info->rtl) (dl_info, 0)) + exit (0x90); + } + } + + /* Initialization each module loaded that has __rtinit. */ + if (dl_info[0].dlinfo_xflags & DL_INFO_OK) + { + for (i = 1; i < dl_info[0].dlinfo_arraylen + 1; ++i) + if (dl_info[i].dlinfo_flags & DL_HAS_RTINIT) + { + rtinit_info = find_rtini t(); + if (rtinit_info) + mod_init1 (handler, rtinit_info); + } + } + + return 0; +} + + +void +__libc_start_init (void) +{ + /* Do run-time linking, if enabled and call the init() + for all loaded modules. */ + if (__libc_start_data.mcount != __libc_start_data.special) + modinit (); +} + +/* For now these are just stubs. */ +void +__libc_start_fini (void) +{ +} + +void +__libc_start_rtld_fini (void) +{ +} + + +int +__libc_start_main (void) +{ + /* Store the lowest stack address. */ + __libc_stack_end = __libc_start_data.stack; + + /* Used by setenv */ + __environ = __libc_start_data.envp; + +#ifndef SHARED + /* Clear errno. */ + errno = 0; + + /* Some security at this point. Prevent starting a SUID binary where + the standard file descriptors are not opened. We have to do this + only for statically linked applications since otherwise the dynamic + loader did the work already. */ + if (__builtin_expect (__libc_enable_secure, 0)) + __libc_check_standard_fds (); + +#endif + + /* Register the destructor of the dynamic linker if there is any. */ + if (__builtin_expect (__libc_start_data.rtld_fini != NULL, 1)) + __cxa_atexit ((void (*) (void *)) __libc_start_data.rtld_fini, NULL, NULL); + + /* Call the initializer of the libc. This is only needed here if we + are compiling for the static library in which case we haven't + run the constructors in `_dl_start_user'. */ +#ifndef SHARED + __libc_init_first (__libc_start_data.argc, __libc_start_data.argv, + __libc_start_data.envp); +#endif + + /* Register the destructor of the program, if any. */ + if (__libc_start_data.fini) + __cxa_atexit ((void (*) (void *)) __libc_start_data.fini, NULL, NULL); + + /* Call the initializer of the program, if any. */ + if (__libc_start_data.init) + (*__libc_start_data.init) (); + + exit ((*__libc_start_data.main) (__libc_start_data.argc, + __libc_start_data.argv, + __libc_start_data.envp)); +} |