/* $OpenBSD: as.c,v 1.4 2002/04/20 01:13:44 deraadt Exp $ */ /* as.c - GAS main program. Copyright (C) 1987, 1990, 1991, 1992 Free Software Foundation, Inc. This file is part of GAS, the GNU Assembler. GAS is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GAS 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 General Public License for more details. You should have received a copy of the GNU General Public License along with GAS; see the file COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ /* * Main program for AS; a 32-bit assembler of GNU. * Understands command arguments. * Has a few routines that don't fit in other modules because they * are shared. * * * bugs * * : initialisers * Since no-one else says they will support them in future: I * don't support them now. * */ #ifndef lint static char rcsid[] = "$OpenBSD: as.c,v 1.4 2002/04/20 01:13:44 deraadt Exp $"; #endif #include #include #ifdef _POSIX_SOURCE #include /* For pid_t in signal.h */ #endif #include #define COMMON #include "as.h" #include "subsegs.h" #if __STDC__ == 1 /* This prototype for got_sig() is ansi. If you want anything else, then your compiler is lying to you when it says that it is __STDC__. If you want to change it, #ifdef protect it from those of us with real ansi compilers. */ #define SIGTY void static void got_sig(int sig); static char *stralloc(char *str); static void perform_an_assembly_pass(int argc, char **argv); #else /* __STDC__ */ #ifndef SIGTY #define SIGTY int #endif static SIGTY got_sig(); static char *stralloc(); /* Make a (safe) copy of a string. */ static void perform_an_assembly_pass(); #endif /* not __STDC__ */ #ifdef DONTDEF static char * gdb_symbol_file_name; long gdb_begin(); #endif int listing; /* true if a listing is wanted */ char *myname; /* argv[0] */ extern const char version_string[]; int main(argc,argv) int argc; char **argv; { int work_argc; /* variable copy of argc */ char **work_argv; /* variable copy of argv */ char *arg; /* an arg to program */ char a; /* an arg flag (after -) */ static const int sig[] = { SIGHUP, SIGINT, SIGPIPE, SIGTERM, 0}; for (a=0;sig[a] != 0;a++) if (signal(sig[a], SIG_IGN) != SIG_IGN) signal(sig[a], got_sig); myname=argv[0]; memset(flagseen, '\0', sizeof(flagseen)); /* aint seen nothing yet */ #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out" #endif /* OBJ_DEFAULT_OUTPUT_FILE_NAME */ out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME; symbol_begin(); /* symbols.c */ subsegs_begin(); /* subsegs.c */ read_begin(); /* read.c */ md_begin(); /* MACHINE.c */ input_scrub_begin(); /* input_scrub.c */ #ifdef DONTDEF gdb_symbol_file_name = 0; #endif /* * Parse arguments, but we are only interested in flags. * When we find a flag, we process it then make it's argv[] NULL. * This helps any future argv[] scanners avoid what we processed. * Since it is easy to do here we interpret the special arg "-" * to mean "use stdin" and we set that argv[] pointing to "". * After we have munged argv[], the only things left are source file * name(s) and ""(s) denoting stdin. These file names are used * (perhaps more than once) later. */ /* FIXME-SOMEDAY this should use getopt. */ work_argc = argc-1; /* don't count argv[0] */ work_argv = argv+1; /* skip argv[0] */ for (;work_argc--;work_argv++) { arg = * work_argv; /* work_argv points to this argument */ if (*arg != '-') /* Filename. We need it later. */ continue; /* Keep scanning args looking for flags. */ if (arg[1] == '-' && arg[2] == 0) { /* "--" as an argument means read STDIN */ /* on this scan, we don't want to think about filenames */ * work_argv = ""; /* Code that means 'use stdin'. */ continue; } /* This better be a switch. */ arg ++; /*->letter. */ while ((a = * arg) != '\0') {/* scan all the 1-char flags */ arg ++; /* arg->after letter. */ a &= 0x7F; /* ascii only please */ /* if (flagseen[a]) as_tsktsk("%s: Flag option - %c has already been seen.", myname, a); */ flagseen[a] = 1; switch (a) { case 'a': { int loop =1; while (loop) { switch (*arg) { case 'l': listing |= LISTING_LISTING; arg++; break; case 's': listing |= LISTING_SYMBOLS; arg++; break; case 'h': listing |= LISTING_HLL; arg++; break; case 'n': listing |= LISTING_NOFORM; arg++; break; case 'd': listing |= LISTING_NODEBUG; arg++; break; default: if (!listing) listing= LISTING_DEFAULT; loop = 0; break; } } } break; case 'f': break; /* -f means fast - no need for "app" preprocessor. */ case 'D': /* DEBUG is implemented: it debugs different */ /* things to other people's assemblers. */ break; #ifdef DONTDEF case 'G': /* GNU AS switch: include gdbsyms. */ if (*arg) /* Rest of argument is file-name. */ gdb_symbol_file_name = stralloc (arg); else if (work_argc) { /* Next argument is file-name. */ work_argc --; * work_argv = NULL; /* Not a source file-name. */ gdb_symbol_file_name = * ++ work_argv; } else as_warn("%s: I expected a filename after -G", myname); arg = ""; /* Finished with this arg. */ break; #endif case 'I': { /* Include file directory */ char *temp = NULL; if (*arg) temp = stralloc (arg); else if (work_argc) { * work_argv = NULL; work_argc--; temp = * ++ work_argv; } if (temp) { add_include_dir (temp); arg = ""; /* Finished with this arg. */ } else as_warn("%s: I expected a filename after -I", myname); break; } case 'L': /* -L means keep L* symbols */ break; case 'o': if (*arg) /* Rest of argument is object file-name. */ out_file_name = stralloc (arg); else if (work_argc) { /* Want next arg for a file-name. */ * work_argv = NULL; /* This is not a file-name. */ work_argc--; out_file_name = * ++ work_argv; } else as_warn("%s: I expected a filename after -o. \"%s\" assumed.", myname, out_file_name); arg = ""; /* Finished with this arg. */ break; case 'R': /* -R means put data into text segment */ break; case 'v': #ifdef OBJ_VMS { extern char *compiler_version_string; compiler_version_string = arg; } #else /* not OBJ_VMS */ fprintf(stderr,version_string); if (*arg && strcmp(arg,"ersion")) as_warn("Unknown -v option ignored"); #endif /* not OBJ_VMS */ while (*arg) arg++; /* Skip the rest */ break; case 'W': /* -W means don't warn about things */ case 'X': /* -X means treat warnings as errors */ case 'Z': /* -Z means attempt to generate object file even after errors. */ break; default: --arg; if (md_parse_option(&arg,&work_argc,&work_argv) == 0) as_warn("%s: I don't understand '%c' flag.", myname, a); if (arg && *arg) arg++; break; } } /* * We have just processed a "-..." arg, which was not a * file-name. Smash it so the * things that look for filenames won't ever see it. * * Whatever work_argv points to, it has already been used * as part of a flag, so DON'T re-use it as a filename. */ *work_argv = NULL; /* NULL means 'not a file-name' */ } #ifdef PIC if (flagseen['K'] || flagseen['k']) picmode = 1; #endif #ifdef DONTDEF if (gdb_begin(gdb_symbol_file_name) == 0) flagseen['G'] = 0; /* Don't do any gdbsym stuff. */ #endif /* Here with flags set up in flagseen[]. */ perform_an_assembly_pass(argc,argv); /* Assemble it. */ #ifdef TC_I960 brtab_emit(); #endif if (seen_at_least_1_file() && !((had_warnings() && flagseen['Z']) || had_errors() > 0)) { write_object_file(); /* relax() addresses then emit object file */ } /* we also check in write_object_file() just before emit. */ input_scrub_end(); md_end(); /* MACHINE.c */ #ifndef NO_LISTING listing_print(""); #endif #ifndef HO_VMS return((had_warnings() && flagseen['Z']) || had_errors() > 0); /* WIN */ #else /* HO_VMS */ return(!((had_warnings() && flagseen['Z']) || had_errors() > 0)); /* WIN */ #endif /* HO_VMS */ } /* main() */ /* perform_an_assembly_pass() * * Here to attempt 1 pass over each input file. * We scan argv[*] looking for filenames or exactly "" which is * shorthand for stdin. Any argv that is NULL is not a file-name. * We set need_pass_2 TRUE if, after this, we still have unresolved * expressions of the form (unknown value)+-(unknown value). * * Note the un*x semantics: there is only 1 logical input file, but it * may be a catenation of many 'physical' input files. */ static void perform_an_assembly_pass(argc, argv) int argc; char **argv; { int saw_a_file = 0; need_pass_2 = 0; #ifdef MANY_SEGMENTS unsigned int i; for (i= SEG_E0; i < SEG_UNKNOWN; i++) { segment_info[i].fix_root = 0; } /* Create the three fixed ones */ subseg_new (SEG_E0, 0); subseg_new (SEG_E1, 0); subseg_new (SEG_E2, 0); strcpy(segment_info[SEG_E0].scnhdr.s_name,".text"); strcpy(segment_info[SEG_E1].scnhdr.s_name,".data"); strcpy(segment_info[SEG_E2].scnhdr.s_name,".bss"); subseg_new (SEG_E0, 0); #else /* not MANY_SEGMENTS */ text_fix_root = NULL; data_fix_root = NULL; bss_fix_root = NULL; subseg_new (SEG_TEXT, 0); #endif /* not MANY_SEGMENTS */ argv++; /* skip argv[0] */ argc--; /* skip argv[0] */ while (argc--) { if (*argv) { /* Is it a file-name argument? */ saw_a_file++; /* argv->"" if stdin desired, else->filename */ read_a_source_file(*argv); } argv++; /* completed that argv */ } if (!saw_a_file) read_a_source_file(""); } /* perform_an_assembly_pass() */ /* * stralloc() * * Allocate memory for a new copy of a string. Copy the string. * Return the address of the new string. Die if there is any error. */ static char * stralloc (str) char * str; { register char * retval; register long len; len = strlen (str) + 1; retval = xmalloc (len); (void) strcpy(retval, str); return(retval); } #ifdef comment static void lose() { as_fatal("%s: 2nd pass not implemented - get your code from random(3)", myname); return; } /* lose() */ #endif /* comment */ static SIGTY got_sig(sig) int sig; { static here_before = 0; as_bad("Interrupted by signal %d", sig); if (here_before++) _exit(1); return((SIGTY) 0); } /* * Local Variables: * comment-column: 0 * fill-column: 131 * End: */ /* end of as.c */