diff options
Diffstat (limited to 'gas/as.c')
-rw-r--r-- | gas/as.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/gas/as.c b/gas/as.c new file mode 100644 index 0000000..a885f0d --- /dev/null +++ b/gas/as.c @@ -0,0 +1,361 @@ +/* as.c - GAS main program. + Copyright (C) 1987, 1990, 1991 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 1, 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. */ + +/* static const char rcsid[] = "$Id$"; */ + +/* + * 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. + * + */ + +#include <stdio.h> +#include <string.h> + +#ifdef _POSIX_SOURCE +#include <sys/types.h> /* For pid_t in signal.h */ +#endif +#include <signal.h> + +#define COMMON + +#include "as.h" + +#ifdef __STDC__ + + /* 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 /* __STDC__ */ + +#ifdef DONTDEF +static char * gdb_symbol_file_name; +long gdb_begin(); +#endif + +char *myname; /* argv[0] */ +extern 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]; + bzero (flagseen, 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 '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; + if (*arg) + temp = stralloc (arg); + else if (work_argc) { + * work_argv = NULL; + work_argc--; + temp = * ++ work_argv; + } else + as_warn("%s: I expected a filename after -I", myname); + add_include_dir (temp); + arg = ""; /* Finished with this arg. */ + break; + } + +#ifndef WORKING_DOT_WORD + case 'k': + break; +#endif + + 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 VMS + { + extern char *compiler_version_string; + compiler_version_string = arg; + } +#else /* not VMS */ + fprintf(stderr,version_string); + if(*arg && strcmp(arg,"ersion")) + as_warn("Unknown -v option ignored"); +#endif + 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 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 VMS + return((had_warnings() && flagseen['Z']) + || had_errors() > 0); /* WIN */ +#else /* VMS */ + return(!((had_warnings() && flagseen['Z']) + || had_errors() > 0)); /* WIN */ +#endif /* 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; + + text_fix_root = NULL; + data_fix_root = NULL; + need_pass_2 = 0; + + subseg_new (SEG_TEXT, 0); + + 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: as.c */ |