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135 lines
3.7 KiB
C
135 lines
3.7 KiB
C
/* Startup code for A/UX
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option) any
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later version.
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In addition to the permissions in the GNU General Public License, the
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Free Software Foundation gives you unlimited permission to link the
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compiled version of this file with other programs, and to distribute
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those programs without any restriction coming from the use of this
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file. (The General Public License restrictions do apply in other
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respects; for example, they cover modification of the file, and
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distribution when not linked into another program.)
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This file is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with files
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compiled with GCC to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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/* This file is compiled three times to produce crt1.o, mcrt1.o, and
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maccrt1.o. The final two are created by defining MCRT1 and MACCRT1
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respectively. */
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#include <stdlib.h>
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#ifdef MCRT1
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#include <unistd.h>
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#include <mon.h>
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#endif
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/* Extern function declarations */
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extern void initfpu(void);
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extern void __istart(void);
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extern void __compatmode(void);
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extern void _cleanup(void);
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extern int main(int, char **, char **);
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extern void exit(int) __attribute__((noreturn));
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extern void _exit(int) __attribute__((noreturn));
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#ifdef MACCRT1
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extern void InitMac(void);
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#endif
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#ifdef MCRT1
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static void monitor_start(void);
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#endif
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/* Global variables */
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char **environ;
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char *__splimit; /* address of top of stack */
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/* Initialize system and run */
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void _start() __attribute__((noreturn));
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void _start()
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{
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register int *fp __asm__("%a6");
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register char *d0 __asm__("%d0");
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char **argv;
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int argc;
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__splimit = d0;
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argc = fp[1];
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argv = (char **)&fp[2];
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environ = &argv[argc+1];
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initfpu();
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__istart();
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__compatmode();
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atexit(_cleanup);
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#ifdef MCRT1
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monitor_start();
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#endif
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#ifdef MACCRT1
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InitMac();
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#endif
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exit(main(argc, argv, environ));
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}
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#ifdef MCRT1
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/* Start/Stop program monitor */
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extern void monitor(void *, void *, WORD *, int, int);
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static WORD *monitor_buffer;
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static void monitor_cleanup(void)
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{
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monitor(NULL, NULL, NULL, 0, 0);
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free(monitor_buffer);
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}
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static void monitor_start(void)
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{
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extern int etext;
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extern int stext __asm__(".text");
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/* Choice of buffer size should be "no more than a few times
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smaller than the program size" -- I don't believe that there
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are any (useful) functions smaller than two insns (4 bytes)
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so that is the scale factor used here */
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int len = (&etext - &stext + 1) / 4;
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monitor_buffer = (WORD *)calloc(len, sizeof(WORD));
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if (monitor_buffer == NULL)
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{
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static const char msg[] = "mcrt1: could not allocate monitor buffer\n";
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write(2, msg, sizeof(msg)-1);
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_exit(-1);
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}
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/* I'm not sure why the count cap at 600 -- but that is what A/UX does */
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monitor(&stext, &etext, monitor_buffer, len, 600);
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atexit(monitor_cleanup);
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}
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#endif /* MCRT1 */
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