Program startup code for AIX.

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));
+}