libgcc/config/vms/vms-ucrt0.c

   1 /* VMS crt0 returning Unix style condition codes.
   2    Copyright (C) 2001-2024 Free Software Foundation, Inc.
   3    Contributed by Douglas B. Rupp (rupp@gnat.com).
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3, or (at your option)
  10    any later version.
  11
  12    GCC is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    Under Section 7 of GPL version 3, you are granted additional
  18    permissions described in the GCC Runtime Library Exception, version
  19    3.1, as published by the Free Software Foundation.
  20
  21    You should have received a copy of the GNU General Public License and
  22    a copy of the GCC Runtime Library Exception along with this program;
  23    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24    <http://www.gnu.org/licenses/>.  */
  25
  26 #include <stdlib.h>
  27
  28 /* Sanity check.  */
  29 #if __INITIAL_POINTER_SIZE != 64
  30 #error "vms-ucrt0.c must be compiled with -mpointer-size=64"
  31 #endif
  32
  33 /* Lots of cheat to handle 32bits/64bits pointer conversions.
  34    We use 'long long' for 64 bits pointers and 'int' for 32 bits pointers.  */
  35
  36 extern void decc$main (void *, void *, void *, void *, unsigned int,
  37                        unsigned int, int *, int *, int *);
  38 extern int main (int, char **, char **);
  39 extern int _malloc32 (int);
  40
  41 #ifdef __ia64__
  42 #define MAIN_ASM_NAME asm ("ELF$TFRADR")
  43 #else
  44 #define MAIN_ASM_NAME
  45 #endif
  46
  47 int __main (void *, void *, void *, void *,
  48             unsigned int, unsigned int) MAIN_ASM_NAME;
  49
  50 /* From errnodef.h, but we need to emulate the globalval.  */
  51 extern int C$_EXIT1;
  52
  53 /* From stsdef.h  */
  54 #define STS$V_MSG_NO 0x03
  55 #define STS$M_INHIB_MSG 0x10000000
  56 /* Symbol defined while main() is compiled to record the flags used.
  57    (Note that the symbol defines the value, ie extract the bits from the
  58     address).
  59    bit 0 set for 64 bit pointers
  60    bit 1 set for posix return value.  */
  61 extern char __gcc_main_flags;
  62
  63 /* From ssdef.h  */
  64 #define SS$_NORMAL 1
  65 #define MAIN_FLAG_64BIT (1 << 0)
  66 #define MAIN_FLAG_POSIX (1 << 1)
  67
  68 int
  69 __main (void *progxfer, void *cli_util, void *imghdr, void *image_file_desc,
  70         unsigned int linkflag, unsigned int cliflag)
  71 {
  72   int argc;
  73   int argv;
  74   int envp;
  75   int status;
  76   char **argv64;
  77   char **envp64;
  78   unsigned int flags = (unsigned __int64)&__gcc_main_flags;
  79
  80   /* The argv and envp arrays are 32 bits pointers to 32 bits pointers.  */
  81   decc$main (progxfer, cli_util, imghdr, image_file_desc,
  82              linkflag, cliflag, &argc, &argv, &envp);
  83
  84   if (flags & MAIN_FLAG_64BIT)
  85     {
  86       int i;
  87
  88       /* Reallocate argv and envp with 64 bit pointers.  */
  89       argv64 = (char **) _malloc32 (sizeof (char *) * (argc + 1));
  90
  91       for (i = 0; i < argc; i++)
  92         argv64[i] = (char *) (__int64)(((int *) (__int64) argv)[i]);
  93
  94       argv64[argc] = NULL;
  95
  96       for (i = 0; ((int *) (__int64) envp)[i]; i++)
  97         ;
  98       envp64 = (char **) _malloc32 (sizeof (char *) * (i + 1));
  99
 100       for (i = 0; ((int *) (__int64) envp)[i]; i++)
 101         envp64[i] = (char *)(__int64)(((int *) (__int64) envp)[i]);
 102
 103       envp64[i] = NULL;
 104     }
 105   else
 106     {
 107       argv64 = (char **)(__int64)argv;
 108       envp64 = (char **)(__int64)envp;
 109     }
 110
 111   status = main (argc, argv64, envp64);
 112
 113   if (flags & MAIN_FLAG_POSIX)
 114     {
 115       /* Map into a range of 0 - 255.  */
 116       status &= 255;
 117
 118       if (status != 0)
 119         {
 120           int save_status = status;
 121
 122           status = (__int64) &C$_EXIT1 + ((status - 1) << STS$V_MSG_NO);
 123
 124           /* An exit failure status requires a "severe" error.  All
 125              status values are defined in errno with a successful (1)
 126              severity but can be changed to an error (2) severity by
 127              adding 1.  In addition for compatibility with UNIX exit()
 128              routines we inhibit a run-time error message from being
 129              generated on exit(1).  */
 130
 131           if (save_status == 1)
 132             {
 133               status++;
 134               status |= STS$M_INHIB_MSG;
 135             }
 136         }
 137       else
 138         status = SS$_NORMAL;
 139     }
 140
 141   return status;
 142 }