mirror of
https://sourceware.org/git/binutils-gdb.git
synced 2024-12-15 04:31:49 +08:00
482 lines
12 KiB
C
482 lines
12 KiB
C
/* 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.
|
||
*
|
||
*/
|
||
|
||
#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"
|
||
#include "config.h"
|
||
#include "subsegs.h"
|
||
#include "output-file.h"
|
||
|
||
#ifndef SIGTY
|
||
#ifdef __STDC__
|
||
#define SIGTY void
|
||
#else
|
||
#define SIGTY int
|
||
#endif /* __STDC__ */
|
||
#endif /* SIGTY */
|
||
|
||
#if 0
|
||
/* Not currently used. */
|
||
static SIGTY got_sig PARAMS ((int sig));
|
||
#endif
|
||
static void perform_an_assembly_pass PARAMS ((int argc, char **argv));
|
||
|
||
#ifndef EXIT_SUCCESS
|
||
#define EXIT_SUCCESS 0
|
||
#define EXIT_FAILURE 1
|
||
#endif
|
||
|
||
int listing; /* true if a listing is wanted */
|
||
|
||
char *myname; /* argv[0] */
|
||
#ifdef BFD_ASSEMBLER
|
||
segT reg_section, expr_section;
|
||
segT text_section, data_section, bss_section;
|
||
#endif
|
||
|
||
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");
|
||
}
|
||
|
||
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 -) */
|
||
|
||
#if 0 /* do we need any of this?? */
|
||
{
|
||
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);
|
||
}
|
||
#endif
|
||
|
||
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
|
||
out_file_name = OBJ_DEFAULT_OUTPUT_FILE_NAME;
|
||
|
||
#ifdef BFD_ASSEMBLER
|
||
bfd_init ();
|
||
#endif
|
||
|
||
symbol_begin ();
|
||
subsegs_begin ();
|
||
read_begin ();
|
||
input_scrub_begin ();
|
||
frag_init ();
|
||
/*
|
||
* 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 */
|
||
flagseen[(unsigned char) 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;
|
||
|
||
case 'I':
|
||
{ /* Include file directory */
|
||
|
||
char *temp = NULL;
|
||
if (*arg)
|
||
{
|
||
temp = strdup (arg);
|
||
if (!temp)
|
||
as_fatal ("virtual memory exhausted");
|
||
}
|
||
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;
|
||
}
|
||
|
||
#ifdef WARN_SIGNED_OVERFLOW_WORD
|
||
/* Don't warn about signed overflow. */
|
||
case 'J':
|
||
break;
|
||
#endif
|
||
|
||
#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 = strdup (arg);
|
||
if (!out_file_name)
|
||
as_fatal ("virtual memory exhausted");
|
||
}
|
||
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 */
|
||
#ifdef NO_FOLD_DATA_AND_TEXT
|
||
as_warn ("-R option not supported on this target.");
|
||
flag_readonly_data_in_text = 0;
|
||
flagseen['R'] = 0;
|
||
#else
|
||
flag_readonly_data_in_text = 1;
|
||
#endif
|
||
break;
|
||
|
||
case 'v':
|
||
#ifdef VMS
|
||
{
|
||
extern char *compiler_version_string;
|
||
compiler_version_string = arg;
|
||
}
|
||
#else /* not VMS */
|
||
if (*arg && strcmp (arg, "ersion"))
|
||
{
|
||
as_warn ("Unknown option `-v%s' ignored", arg);
|
||
arg += strlen (arg);
|
||
break;
|
||
}
|
||
|
||
print_version_id ();
|
||
#endif /* not VMS */
|
||
while (*arg)
|
||
arg++; /* Skip the rest */
|
||
break;
|
||
|
||
case 'W':
|
||
/* -W means don't warn about things */
|
||
flag_suppress_warnings = 1;
|
||
break;
|
||
|
||
case 'w':
|
||
case 'X':
|
||
/* -X means treat warnings as errors */
|
||
break;
|
||
case 'Z':
|
||
/* -Z means attempt to generate object file even after errors. */
|
||
flag_always_generate_output = 1;
|
||
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 BFD_ASSEMBLER
|
||
output_file_create (out_file_name);
|
||
assert (stdoutput != 0);
|
||
#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 () && flag_always_generate_output)
|
||
|| had_errors () > 0))
|
||
{
|
||
write_object_file (); /* relax() addresses then emit object file */
|
||
} /* we also check in write_object_file() just before emit. */
|
||
#ifdef BFD_ASSEMBLER
|
||
else
|
||
{
|
||
output_file_close (out_file_name);
|
||
unlink (out_file_name);
|
||
}
|
||
#endif
|
||
|
||
input_scrub_end ();
|
||
md_end (); /* MACHINE.c */
|
||
|
||
#ifndef NO_LISTING
|
||
listing_print ("");
|
||
#endif
|
||
|
||
if ((had_warnings () && flagseen['Z'])
|
||
|| had_errors () > 0)
|
||
return EXIT_FAILURE;
|
||
return EXIT_SUCCESS;
|
||
}
|
||
|
||
|
||
/* 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;
|
||
|
||
seg = subseg_new (".text", 0);
|
||
assert (seg == SEG_E0);
|
||
seg = subseg_new (".data", 0);
|
||
assert (seg == SEG_E1);
|
||
seg = subseg_new (".bss", 0);
|
||
assert (seg == SEG_E2);
|
||
}
|
||
|
||
#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);
|
||
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? */
|
||
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() */
|
||
|
||
#if 0
|
||
/* This is not currently used. */
|
||
static SIGTY
|
||
got_sig (sig)
|
||
int sig;
|
||
{
|
||
static here_before = 0;
|
||
|
||
as_bad ("Interrupted by signal %d", sig);
|
||
if (here_before++)
|
||
exit (EXIT_FAILURE);
|
||
#if 0 /* If SIGTY is void, this produces warnings. */
|
||
return ((SIGTY) 0);
|
||
#endif
|
||
}
|
||
#endif
|
||
|
||
/* end of as.c */
|