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- /* as.c - GAS main program.
- Copyright (C) 1987, 90, 91, 92, 93, 94, 95, 1996
- 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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.
- *
- */
-
- #include "ansidecl.h"
- #include "libiberty.h"
-
- #define COMMON
-
- #include "as.h"
- #include "subsegs.h"
- #include "output-file.h"
- #include "sb.h"
- #include "macro.h"
-
- static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
- static int macro_expr PARAMS ((const char *, int, sb *, int *));
-
- int listing; /* true if a listing is wanted */
-
- static char *listing_filename = NULL; /* Name of listing file. */
-
- /* Maximum level of macro nesting. */
-
- int max_macro_nest = 100;
-
- char *myname; /* argv[0] */
- #ifdef BFD_ASSEMBLER
- segT reg_section, expr_section;
- segT text_section, data_section, bss_section;
- #endif
-
- int chunksize = 5000;
-
- /* To monitor memory allocation more effectively, make this non-zero.
- Then the chunk sizes for gas and bfd will be reduced. */
- int debug_memory = 0;
-
- /* We build a list of defsyms as we read the options, and then define
- them after we have initialized everything. */
-
- struct defsym_list
- {
- struct defsym_list *next;
- char *name;
- valueT value;
- };
-
- static struct defsym_list *defsyms;
-
- void
- print_version_id ()
- {
- static int printed;
- if (printed)
- return;
- printed = 1;
-
- fprintf (stderr, "GNU assembler version %s (%s)", GAS_VERSION, TARGET_ALIAS);
- #ifdef BFD_ASSEMBLER
- fprintf (stderr, ", using BFD version %s", BFD_VERSION);
- #endif
- fprintf (stderr, "\n");
- }
-
- void
- show_usage (stream)
- FILE *stream;
- {
- fprintf (stream, "Usage: %s [option...] [asmfile...]\n", myname);
-
- fprintf (stream, "\
- Options:\n\
- -a[sub-option...] turn on listings\n\
- Sub-options [default hls]:\n\
- d omit debugging directives\n\
- h include high-level source\n\
- l include assembly\n\
- n omit forms processing\n\
- s include symbols\n\
- =file set listing file name (must be last sub-option)\n");
- fprintf (stream, "\
- -D produce assembler debugging messages\n\
- --defsym SYM=VAL define symbol SYM to given value\n\
- -f skip whitespace and comment preprocessing\n\
- --help show this message and exit\n\
- -I DIR add DIR to search list for .include directives\n\
- -J don't warn about signed overflow\n\
- -K warn when differences altered for long displacements\n\
- -L keep local symbols (starting with `L')\n");
- fprintf (stream, "\
- -M,--mri assemble in MRI compatibility mode\n\
- -nocpp ignored\n\
- -o OBJFILE name the object-file output OBJFILE (default a.out)\n\
- -R fold data section into text section\n\
- --statistics print various measured statistics from execution\n\
- --version print assembler version number and exit\n\
- -W suppress warnings\n\
- -w ignored\n\
- -X ignored\n\
- -Z generate object file even after errors\n");
-
- md_show_usage (stream);
- }
-
- #ifdef USE_EMULATIONS
- #define EMULATION_ENVIRON "AS_EMULATION"
-
- extern struct emulation mipsbelf, mipslelf, mipself;
- extern struct emulation mipsbecoff, mipslecoff, mipsecoff;
-
- static struct emulation *const emulations[] = { EMULATIONS };
- static const int n_emulations = sizeof (emulations) / sizeof (emulations[0]);
-
- static void
- select_emulation_mode (argc, argv)
- int argc;
- char **argv;
- {
- int i;
- char *p, *em = 0;
-
- for (i = 1; i < argc; i++)
- if (!strncmp ("--em", argv[i], 4))
- break;
-
- if (i == argc)
- goto do_default;
-
- p = strchr (argv[i], '=');
- if (p)
- p++;
- else
- p = argv[i+1];
-
- if (!p || !*p)
- as_fatal ("missing emulation mode name");
- em = p;
-
- do_default:
- if (em == 0)
- em = getenv (EMULATION_ENVIRON);
- if (em == 0)
- em = DEFAULT_EMULATION;
-
- if (em)
- {
- for (i = 0; i < n_emulations; i++)
- if (!strcmp (emulations[i]->name, em))
- break;
- if (i == n_emulations)
- as_fatal ("unrecognized emulation name `%s'", em);
- this_emulation = emulations[i];
- }
- else
- this_emulation = emulations[0];
-
- this_emulation->init ();
- }
-
- const char *
- default_emul_bfd_name ()
- {
- abort ();
- return NULL;
- }
-
- void
- common_emul_init ()
- {
- this_format = this_emulation->format;
-
- if (this_emulation->leading_underscore == 2)
- this_emulation->leading_underscore = this_format->dfl_leading_underscore;
-
- if (this_emulation->default_endian != 2)
- target_big_endian = this_emulation->default_endian;
-
- if (this_emulation->fake_label_name == 0)
- {
- if (this_emulation->leading_underscore)
- this_emulation->fake_label_name = "L0\001";
- else
- /* What other parameters should we test? */
- this_emulation->fake_label_name = ".L0\001";
- }
- }
- #endif
-
- /*
- * 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.
- *
- * check for new machine-dep cmdline options in
- * md_parse_option definitions in config/tc-*.c
- */
-
- void
- parse_args (pargc, pargv)
- int *pargc;
- char ***pargv;
- {
- int old_argc, new_argc;
- char **old_argv, **new_argv;
-
- /* Starting the short option string with '-' is for programs that
- expect options and other ARGV-elements in any order and that care about
- the ordering of the two. We describe each non-option ARGV-element
- as if it were the argument of an option with character code 1. */
-
- char *shortopts;
- extern CONST char *md_shortopts;
- static const char std_shortopts[] =
- {
- '-', 'J',
- #ifndef WORKING_DOT_WORD
- /* -K is not meaningful if .word is not being hacked. */
- 'K',
- #endif
- 'L', 'M', 'R', 'W', 'Z', 'f', 'a', ':', ':', 'D', 'I', ':', 'o', ':',
- #ifndef VMS
- /* -v takes an argument on VMS, so we don't make it a generic
- option. */
- 'v',
- #endif
- 'w', 'X',
- '\0'
- };
- struct option *longopts;
- extern struct option md_longopts[];
- extern size_t md_longopts_size;
- static const struct option std_longopts[] = {
- #define OPTION_HELP (OPTION_STD_BASE)
- {"help", no_argument, NULL, OPTION_HELP},
- {"mri", no_argument, NULL, 'M'},
- #define OPTION_NOCPP (OPTION_STD_BASE + 1)
- {"nocpp", no_argument, NULL, OPTION_NOCPP},
- #define OPTION_STATISTICS (OPTION_STD_BASE + 2)
- {"statistics", no_argument, NULL, OPTION_STATISTICS},
- #define OPTION_VERSION (OPTION_STD_BASE + 3)
- {"version", no_argument, NULL, OPTION_VERSION},
- #define OPTION_DUMPCONFIG (OPTION_STD_BASE + 4)
- {"dump-config", no_argument, NULL, OPTION_DUMPCONFIG},
- #define OPTION_VERBOSE (OPTION_STD_BASE + 5)
- {"verbose", no_argument, NULL, OPTION_VERBOSE},
- #define OPTION_EMULATION (OPTION_STD_BASE + 6)
- {"emulation", required_argument, NULL, OPTION_EMULATION},
- #define OPTION_DEFSYM (OPTION_STD_BASE + 7)
- {"defsym", required_argument, NULL, OPTION_DEFSYM}
- };
-
- /* Construct the option lists from the standard list and the
- target dependent list. */
- shortopts = concat (std_shortopts, md_shortopts, (char *) NULL);
- longopts = (struct option *) xmalloc (sizeof (std_longopts) + md_longopts_size);
- memcpy (longopts, std_longopts, sizeof (std_longopts));
- memcpy ((char *) longopts + sizeof (std_longopts),
- md_longopts, md_longopts_size);
-
- /* Make a local copy of the old argv. */
- old_argc = *pargc;
- old_argv = *pargv;
-
- /* Initialize a new argv that contains no options. */
- new_argv = (char **) xmalloc (sizeof (char *) * (old_argc + 1));
- new_argv[0] = old_argv[0];
- new_argc = 1;
- new_argv[new_argc] = NULL;
-
- while (1)
- {
- /* getopt_long_only is like getopt_long, but '-' as well as '--' can
- indicate a long option. */
- int longind;
- int optc = getopt_long_only (old_argc, old_argv, shortopts, longopts,
- &longind);
-
- if (optc == -1)
- break;
-
- switch (optc)
- {
- default:
- /* md_parse_option should return 1 if it recognizes optc,
- 0 if not. */
- if (md_parse_option (optc, optarg) != 0)
- break;
- /* `-v' isn't included in the general short_opts list, so check for
- it explicity here before deciding we've gotten a bad argument. */
- if (optc == 'v')
- {
- #ifdef VMS
- /* Telling getopt to treat -v's value as optional can result
- in it picking up a following filename argument here. The
- VMS code in md_parse_option can return 0 in that case,
- but it has no way of pushing the filename argument back. */
- if (optarg && *optarg)
- new_argv[new_argc++] = optarg, new_argv[new_argc] = NULL;
- else
- #else
- case 'v':
- #endif
- case OPTION_VERBOSE:
- print_version_id ();
- break;
- }
- /*FALLTHRU*/
-
- case '?':
- exit (EXIT_FAILURE);
-
- case 1: /* File name. */
- if (!strcmp (optarg, "-"))
- optarg = "";
- new_argv[new_argc++] = optarg;
- new_argv[new_argc] = NULL;
- break;
-
- case OPTION_HELP:
- show_usage (stdout);
- exit (EXIT_SUCCESS);
-
- case OPTION_NOCPP:
- break;
-
- case OPTION_STATISTICS:
- flag_print_statistics = 1;
- break;
-
- case OPTION_VERSION:
- print_version_id ();
- exit (EXIT_SUCCESS);
-
- case OPTION_EMULATION:
- #ifdef USE_EMULATIONS
- if (strcmp (optarg, this_emulation->name))
- as_fatal ("multiple emulation names specified");
- #else
- as_fatal ("emulations not handled in this configuration");
- #endif
- break;
-
- case OPTION_DUMPCONFIG:
- fprintf (stderr, "alias = %s\n", TARGET_ALIAS);
- fprintf (stderr, "canonical = %s\n", TARGET_CANONICAL);
- fprintf (stderr, "cpu-type = %s\n", TARGET_CPU);
- #ifdef TARGET_OBJ_FORMAT
- fprintf (stderr, "format = %s\n", TARGET_OBJ_FORMAT);
- #endif
- #ifdef TARGET_FORMAT
- fprintf (stderr, "bfd-target = %s\n", TARGET_FORMAT);
- #endif
- exit (EXIT_SUCCESS);
-
- case OPTION_DEFSYM:
- {
- char *s;
- long i;
- struct defsym_list *n;
-
- for (s = optarg; *s != '\0' && *s != '='; s++)
- ;
- if (*s == '\0')
- as_fatal ("bad defsym; format is --defsym name=value");
- *s++ = '\0';
- i = strtol (s, (char **) NULL, 0);
- n = (struct defsym_list *) xmalloc (sizeof *n);
- n->next = defsyms;
- n->name = optarg;
- n->value = i;
- defsyms = n;
- }
- break;
-
- case 'J':
- flag_signed_overflow_ok = 1;
- break;
-
- #ifndef WORKING_DOT_WORD
- case 'K':
- flag_warn_displacement = 1;
- break;
- #endif
-
- case 'L':
- flag_keep_locals = 1;
- break;
-
- case 'M':
- flag_mri = 1;
- #ifdef TC_M68K
- flag_m68k_mri = 1;
- #endif
- break;
-
- case 'R':
- flag_readonly_data_in_text = 1;
- break;
-
- case 'W':
- flag_no_warnings = 1;
- break;
-
- case 'Z':
- flag_always_generate_output = 1;
- break;
-
- case 'a':
- if (optarg)
- {
- while (*optarg)
- {
- switch (*optarg)
- {
- case 'd':
- listing |= LISTING_NODEBUG;
- break;
- case 'h':
- listing |= LISTING_HLL;
- break;
- case 'l':
- listing |= LISTING_LISTING;
- break;
- case 'n':
- listing |= LISTING_NOFORM;
- break;
- case 's':
- listing |= LISTING_SYMBOLS;
- break;
- case '=':
- listing_filename = xstrdup (optarg + 1);
- optarg += strlen (listing_filename);
- break;
- default:
- as_fatal ("invalid listing option `%c'", *optarg);
- break;
- }
- optarg++;
- }
- }
- if (!listing)
- listing = LISTING_DEFAULT;
- break;
-
- case 'D':
- /* DEBUG is implemented: it debugs different */
- /* things from other people's assemblers. */
- flag_debug = 1;
- break;
-
- case 'f':
- flag_no_comments = 1;
- break;
-
- case 'I':
- { /* Include file directory */
- char *temp = xstrdup (optarg);
- add_include_dir (temp);
- break;
- }
-
- case 'o':
- out_file_name = xstrdup (optarg);
- break;
-
- case 'w':
- break;
-
- case 'X':
- /* -X means treat warnings as errors */
- break;
- }
- }
-
- free (shortopts);
- free (longopts);
-
- *pargc = new_argc;
- *pargv = new_argv;
- }
-
- static void dump_statistics ();
- static long start_time;
-
- int
- main (argc, argv)
- int argc;
- char **argv;
- {
- int macro_alternate;
- int macro_strip_at;
- int keep_it;
-
- start_time = get_run_time ();
-
- if (debug_memory)
- {
- #ifdef BFD_ASSEMBLER
- extern long _bfd_chunksize;
- _bfd_chunksize = 64;
- #endif
- chunksize = 64;
- }
-
- #ifdef HOST_SPECIAL_INIT
- HOST_SPECIAL_INIT (argc, argv);
- #endif
-
- myname = argv[0];
- xmalloc_set_program_name (myname);
-
- START_PROGRESS (myname, 0);
-
- #ifndef OBJ_DEFAULT_OUTPUT_FILE_NAME
- #define OBJ_DEFAULT_OUTPUT_FILE_NAME "a.out"
- #endif
-
- out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
-
- hex_init ();
- #ifdef BFD_ASSEMBLER
- bfd_init ();
- bfd_set_error_program_name (myname);
- #endif
-
- #ifdef USE_EMULATIONS
- select_emulation_mode (argc, argv);
- #endif
-
- PROGRESS (1);
- symbol_begin ();
- frag_init ();
- subsegs_begin ();
- parse_args (&argc, &argv);
- read_begin ();
- input_scrub_begin ();
- expr_begin ();
-
- if (flag_print_statistics)
- xatexit (dump_statistics);
-
- macro_alternate = 0;
- macro_strip_at = 0;
- #ifdef TC_I960
- macro_strip_at = flag_mri;
- #endif
- #ifdef TC_A29K
- /* For compatibility with the AMD 29K family macro assembler
- specification. */
- macro_alternate = 1;
- macro_strip_at = 1;
- #endif
-
- macro_init (macro_alternate, flag_mri, macro_strip_at, macro_expr);
-
- PROGRESS (1);
-
- #ifdef BFD_ASSEMBLER
- output_file_create (out_file_name);
- assert (stdoutput != 0);
- #endif
-
- #ifdef tc_init_after_args
- tc_init_after_args ();
- #endif
-
- /* Now that we have fully initialized, and have created the output
- file, define any symbols requested by --defsym command line
- arguments. */
- while (defsyms != NULL)
- {
- symbolS *sym;
- struct defsym_list *next;
-
- sym = symbol_new (defsyms->name, absolute_section, defsyms->value,
- &zero_address_frag);
- symbol_table_insert (sym);
- next = defsyms->next;
- free (defsyms);
- defsyms = next;
- }
-
- PROGRESS (1);
-
- perform_an_assembly_pass (argc, argv); /* Assemble it. */
-
- #ifdef md_end
- md_end ();
- #endif
-
- if (seen_at_least_1_file ()
- && !((had_warnings () && flag_always_generate_output)
- || had_errors () > 0))
- keep_it = 1;
- else
- keep_it = 0;
-
- if (keep_it)
- write_object_file ();
-
- #ifndef NO_LISTING
- listing_print (listing_filename);
- #endif
-
- #ifndef OBJ_VMS /* does its own file handling */
- #ifndef BFD_ASSEMBLER
- if (keep_it)
- #endif
- output_file_close (out_file_name);
- #endif
-
- if (!keep_it)
- unlink (out_file_name);
-
- input_scrub_end ();
-
- END_PROGRESS (myname);
-
- /* Use xexit instead of return, because under VMS environments they
- may not place the same interpretation on the value given. */
- if ((had_warnings () && flag_always_generate_output)
- || had_errors () > 0)
- xexit (EXIT_FAILURE);
- xexit (EXIT_SUCCESS);
- }
-
- static void
- dump_statistics ()
- {
- extern char **environ;
- #ifdef HAVE_SBRK
- char *lim = (char *) sbrk (0);
- #endif
- long run_time = get_run_time () - start_time;
-
- fprintf (stderr, "%s: total time in assembly: %ld.%06ld\n",
- myname, run_time / 1000000, run_time % 1000000);
- #ifdef HAVE_SBRK
- fprintf (stderr, "%s: data size %ld\n",
- myname, (long) (lim - (char *) &environ));
- #endif
-
- subsegs_print_statistics (stderr);
- write_print_statistics (stderr);
- symbol_print_statistics (stderr);
- read_print_statistics (stderr);
-
- #ifdef tc_print_statistics
- tc_print_statistics (stderr);
- #endif
- #ifdef obj_print_statistics
- obj_print_statistics (stderr);
- #endif
- }
-
-
- /* 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;
- #ifdef BFD_ASSEMBLER
- flagword applicable;
- #endif
-
- need_pass_2 = 0;
-
- #ifndef BFD_ASSEMBLER
- #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 */
- {
- segT seg;
-
- #ifdef TE_APOLLO
- seg = subseg_new (".wtext", 0);
- #else
- seg = subseg_new (".text", 0);
- #endif
- assert (seg == SEG_E0);
- seg = subseg_new (".data", 0);
- assert (seg == SEG_E1);
- seg = subseg_new (".bss", 0);
- assert (seg == SEG_E2);
- #ifdef TE_APOLLO
- create_target_segments ();
- #endif
- }
-
- #else /* not MANY_SEGMENTS */
- text_fix_root = NULL;
- data_fix_root = NULL;
- bss_fix_root = NULL;
- #endif /* not MANY_SEGMENTS */
- #else /* BFD_ASSEMBLER */
- /* Create the standard sections, and those the assembler uses
- internally. */
- text_section = subseg_new (".text", 0);
- data_section = subseg_new (".data", 0);
- bss_section = subseg_new (".bss", 0);
- /* @@ FIXME -- we're setting the RELOC flag so that sections are assumed
- to have relocs, otherwise we don't find out in time. */
- applicable = bfd_applicable_section_flags (stdoutput);
- bfd_set_section_flags (stdoutput, text_section,
- applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC
- | SEC_CODE | SEC_READONLY));
- /* @@ FIXME -- SEC_CODE seems to mean code only, rather than code possibly.*/
- bfd_set_section_flags (stdoutput, data_section,
- applicable & (SEC_ALLOC | SEC_LOAD | SEC_RELOC));
- bfd_set_section_flags (stdoutput, bss_section, applicable & SEC_ALLOC);
- seg_info (bss_section)->bss = 1;
- subseg_new (BFD_ABS_SECTION_NAME, 0);
- subseg_new (BFD_UND_SECTION_NAME, 0);
- reg_section = subseg_new ("*GAS `reg' section*", 0);
- expr_section = subseg_new ("*GAS `expr' section*", 0);
-
- #endif /* BFD_ASSEMBLER */
-
- subseg_set (text_section, 0);
-
- /* This may add symbol table entries, which requires having an open BFD,
- and sections already created, in BFD_ASSEMBLER mode. */
- md_begin ();
-
- argv++; /* skip argv[0] */
- argc--; /* skip argv[0] */
- while (argc--)
- {
- if (*argv)
- { /* Is it a file-name argument? */
- PROGRESS (1);
- 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() */
-
- /* The interface between the macro code and gas expression handling. */
-
- static int
- macro_expr (emsg, idx, in, val)
- const char *emsg;
- int idx;
- sb *in;
- int *val;
- {
- char *hold;
- expressionS ex;
-
- sb_terminate (in);
-
- hold = input_line_pointer;
- input_line_pointer = in->ptr + idx;
- expression (&ex);
- idx = input_line_pointer - in->ptr;
- input_line_pointer = hold;
-
- if (ex.X_op != O_constant)
- as_bad ("%s", emsg);
-
- *val = (int) ex.X_add_number;
-
- return idx;
- }
-
- /* end of as.c */
-