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ad9bd833d4
When the command line option --scfi=experimenta is passed to the GNU
assembler, it will synthesize DWARF call frame information (CFI) for the
input assembly.
The option --scfi=experimental will also ignore most of the existing
.cfi_* directives, if already contained in the provided input file.
Only the following CFI directives will not be ignored:
- .cfi_sections,
- .cfi_label,
- .cfi_signal_frame
To use SCFI, a target will need to:
- define TARGET_USE_SCFI and TARGET_USE_GINSN, and other necessary
definitions,
- provide means to help GAS understand the target specific instruction
semantics by creating ginsns.
The upcoming support for SCFI is inteded to be experimental, hence the
option --scfi=experimental. The --scfi= may see more options like
--scfi=[all,none] added in future, once the SCFI support in GAS is
mature and robust. The offering may also see for example, an
--scfi=inline option for dealing with inline asm may be added in the
future. In --scfi=inline option, the GNU assembler may consume (and not
ignore) the compiler generated CFI for the code surrounding the inline
asm.
Also document the option.
gas/
* as.c (show_usage): Add support for --scfi=experimental.
(parse_args): Likewise.
* as.h (enum synth_cfi_type): Define new type.
* doc/as.texi: Document the new option.
679 lines
18 KiB
C
679 lines
18 KiB
C
/* as.h - global header file
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Copyright (C) 1987-2024 Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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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 GAS; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef GAS
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#define GAS 1
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/* I think this stuff is largely out of date. xoxorich.
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CAPITALISED names are #defined.
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"lowercaseH" is #defined if "lowercase.h" has been #include-d.
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"lowercaseT" is a typedef of "lowercase" objects.
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"lowercaseP" is type "pointer to object of type 'lowercase'".
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"lowercaseS" is typedef struct ... lowercaseS.
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#define DEBUG to enable all the "know" assertion tests.
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#define SUSPECT when debugging hash code.
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#define COMMON as "extern" for all modules except one, where you #define
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COMMON as "".
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If TEST is #defined, then we are testing a module: #define COMMON as "". */
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#include "config.h"
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/* Now, tend to the rest of the configuration. */
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/* System include files first... */
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_TYPES_H
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/* for size_t, pid_t */
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#include <sys/types.h>
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#endif
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#include <errno.h>
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#include <stdarg.h>
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#include "getopt.h"
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/* The first getopt value for machine-independent long options.
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150 isn't special; it's just an arbitrary non-ASCII char value. */
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#define OPTION_STD_BASE 150
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/* The first getopt value for machine-dependent long options.
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290 gives the standard options room to grow. */
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#define OPTION_MD_BASE 290
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#ifdef DEBUG
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#undef NDEBUG
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#endif
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#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 6)
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#define __PRETTY_FUNCTION__ ((char *) NULL)
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#endif
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#define gas_assert(P) ((void) ((P) ? 0 : (abort (), 0)))
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#undef abort
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#define abort() as_abort (__FILE__, __LINE__, __PRETTY_FUNCTION__)
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/* Now GNU header files... */
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#include "ansidecl.h"
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#include "bfd.h"
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#include "libiberty.h"
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/* Other stuff from config.h. */
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#ifdef NEED_DECLARATION_ENVIRON
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extern char **environ;
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#endif
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#ifdef NEED_DECLARATION_FFS
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extern int ffs (int);
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#endif
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#if !HAVE_DECL_MEMPCPY
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void *mempcpy(void *, const void *, size_t);
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#endif
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#ifndef __LINE__
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#define __LINE__ "unknown"
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#endif /* __LINE__ */
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#ifndef __FILE__
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#define __FILE__ "unknown"
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#endif /* __FILE__ */
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#ifndef FOPEN_WB
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#ifdef USE_BINARY_FOPEN
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#include "fopen-bin.h"
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#else
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#include "fopen-same.h"
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#endif
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#endif
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#ifndef EXIT_SUCCESS
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#define EXIT_SUCCESS 0
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#define EXIT_FAILURE 1
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#endif
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#ifndef SEEK_SET
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#define SEEK_SET 0
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#endif
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#define obstack_chunk_alloc xmalloc
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#define obstack_chunk_free xfree
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#define xfree free
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#if GCC_VERSION >= 7000
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#define gas_mul_overflow(a, b, res) __builtin_mul_overflow (a, b, res)
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#else
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/* Assumes unsigned values. Careful! Args evaluated multiple times. */
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#define gas_mul_overflow(a, b, res) \
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((*res) = (a), (*res) *= (b), (b) != 0 && (*res) / (b) != (a))
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#endif
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#include "asintl.h"
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#define BAD_CASE(val) \
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{ \
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as_fatal (_("Case value %ld unexpected at line %d of file \"%s\"\n"), \
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(long) val, __LINE__, __FILE__); \
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}
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#include "flonum.h"
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/* These are assembler-wide concepts */
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extern bfd *stdoutput;
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typedef bfd_vma addressT;
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typedef bfd_signed_vma offsetT;
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/* Type of symbol value, etc. For use in prototypes. */
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typedef addressT valueT;
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#ifndef COMMON
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#ifdef TEST
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#define COMMON /* Declare our COMMONs storage here. */
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#else
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#define COMMON extern /* Our commons live elsewhere. */
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#endif
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#endif
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/* COMMON now defined */
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#ifndef ENABLE_CHECKING
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#define ENABLE_CHECKING 0
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#endif
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#if ENABLE_CHECKING || defined (DEBUG)
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#ifndef know
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#define know(p) gas_assert(p) /* Verify our assumptions! */
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#endif /* not yet defined */
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#else
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#define know(p) do {} while (0) /* know() checks are no-op.ed */
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#endif
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/* input_scrub.c */
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/* Supplies sanitised buffers to read.c.
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Also understands printing line-number part of error messages. */
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/* subsegs.c Sub-segments. Also, segment(=expression type)s.*/
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typedef asection *segT;
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#define SEG_NORMAL(SEG) ( (SEG) != absolute_section \
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&& (SEG) != undefined_section \
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&& (SEG) != reg_section \
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&& (SEG) != expr_section)
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typedef int subsegT;
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/* What subseg we are accessing now? */
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COMMON subsegT now_subseg;
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/* Segment our instructions emit to. */
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COMMON segT now_seg;
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#define segment_name(SEG) bfd_section_name (SEG)
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extern segT reg_section, expr_section;
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/* Shouldn't these be eliminated someday? */
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extern segT text_section, data_section, bss_section;
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#define absolute_section bfd_abs_section_ptr
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#define undefined_section bfd_und_section_ptr
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enum _relax_state
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{
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/* Dummy frag used by listing code. */
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rs_dummy = 0,
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/* Variable chars to be repeated fr_offset times.
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Fr_symbol unused. Used with fr_offset == 0 for a
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constant length frag. */
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rs_fill,
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/* Align. The fr_offset field holds the power of 2 to which to
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align. The fr_var field holds the number of characters in the
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fill pattern. The fr_subtype field holds the maximum number of
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bytes to skip when aligning, or 0 if there is no maximum. */
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rs_align,
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/* Align code. The fr_offset field holds the power of 2 to which
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to align. This type is only generated by machine specific
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code, which is normally responsible for handling the fill
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pattern. The fr_subtype field holds the maximum number of
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bytes to skip when aligning, or 0 if there is no maximum. */
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rs_align_code,
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/* Test for alignment. Like rs_align, but used by several targets
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to warn if data is not properly aligned. */
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rs_align_test,
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/* Org: Fr_offset, fr_symbol: address. 1 variable char: fill
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character. */
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rs_org,
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#ifndef WORKING_DOT_WORD
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/* JF: gunpoint */
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rs_broken_word,
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#endif
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/* Machine specific relaxable (or similarly alterable) instruction. */
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rs_machine_dependent,
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/* .space directive with expression operand that needs to be computed
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later. Similar to rs_org, but different.
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fr_symbol: operand
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1 variable char: fill character */
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rs_space,
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/* .nop directive with expression operand that needs to be computed
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later. Similar to rs_space, but different. It fills with no-op
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instructions.
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fr_symbol: operand
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1 constant byte: no-op fill control byte. */
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rs_space_nop,
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/* Similar to rs_fill. It is used to implement .nops directive.
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When listings are enabled, fr_opcode gets the buffer assigned, once
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that's available. */
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rs_fill_nop,
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/* A DWARF leb128 value; only ELF uses this. The subtype is 0 for
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unsigned, 1 for signed. */
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rs_leb128,
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/* Exception frame information which we may be able to optimize. */
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rs_cfa,
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/* Cross-fragment dwarf2 line number optimization. */
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rs_dwarf2dbg,
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/* SFrame FRE type selection optimization. */
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rs_sframe
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};
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typedef enum _relax_state relax_stateT;
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/* This type is used in prototypes, so it can't be a type that will be
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widened for argument passing. */
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typedef unsigned int relax_substateT;
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/* Enough bits for address, but still an integer type.
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Could be a problem, cross-assembling for 64-bit machines. */
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typedef addressT relax_addressT;
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struct relax_type
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{
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/* Forward reach. Signed number. > 0. */
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offsetT rlx_forward;
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/* Backward reach. Signed number. < 0. */
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offsetT rlx_backward;
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/* Bytes length of this address. */
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unsigned char rlx_length;
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/* Next longer relax-state. 0 means there is no 'next' relax-state. */
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relax_substateT rlx_more;
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};
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typedef struct relax_type relax_typeS;
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/* main program "as.c" (command arguments etc). */
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COMMON unsigned char flag_no_comments; /* -f */
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COMMON unsigned char flag_debug; /* -D */
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COMMON unsigned char flag_signed_overflow_ok; /* -J */
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#ifndef WORKING_DOT_WORD
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COMMON unsigned char flag_warn_displacement; /* -K */
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#endif
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/* True if local symbols should be retained. */
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COMMON int flag_keep_locals; /* -L */
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/* True if we are assembling in MRI mode. */
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COMMON int flag_mri;
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/* True if alternate macro mode is in effect. */
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COMMON bool flag_macro_alternate;
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/* Should the data section be made read-only and appended to the text
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section? */
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COMMON unsigned char flag_readonly_data_in_text; /* -R */
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/* True if warnings should be inhibited. */
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COMMON int flag_no_warnings; /* -W */
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/* True if warnings count as errors. */
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COMMON int flag_fatal_warnings; /* --fatal-warnings */
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/* True if we should attempt to generate output even if non-fatal errors
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are detected. */
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COMMON unsigned char flag_always_generate_output; /* -Z */
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enum synth_cfi_type
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{
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SYNTH_CFI_NONE = 0,
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SYNTH_CFI_EXPERIMENTAL,
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};
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COMMON enum synth_cfi_type flag_synth_cfi;
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/* This is true if the assembler should output time and space usage. */
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COMMON unsigned char flag_print_statistics;
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/* True if local absolute symbols are to be stripped. */
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COMMON int flag_strip_local_absolute;
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/* True if we should generate a traditional format object file. */
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COMMON int flag_traditional_format;
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/* Type of compressed debug sections we should generate. */
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COMMON enum compressed_debug_section_type flag_compress_debug;
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/* TRUE if .note.GNU-stack section with SEC_CODE should be created */
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COMMON int flag_execstack;
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/* TRUE if .note.GNU-stack section with SEC_CODE should be created */
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COMMON int flag_noexecstack;
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/* TRUE if .sframe section should be created. */
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COMMON int flag_gen_sframe;
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/* name of emitted object file */
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COMMON const char *out_file_name;
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/* Keep the output file. */
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COMMON int keep_it;
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/* name of file defining extensions to the basic instruction set */
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COMMON char *insttbl_file_name;
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/* TRUE if we need a second pass. */
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COMMON int need_pass_2;
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/* TRUE if we should do no relaxing, and
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leave lots of padding. */
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COMMON int linkrelax;
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COMMON int do_not_pad_sections_to_alignment;
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enum multibyte_input_handling
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{
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multibyte_allow = 0,
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multibyte_warn,
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multibyte_warn_syms
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};
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COMMON enum multibyte_input_handling multibyte_handling;
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/* TRUE if we should produce a listing. */
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extern int listing;
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/* Type of debugging information we should generate. We currently support
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stabs, ECOFF, and DWARF2.
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NOTE! This means debug information about the assembly source code itself
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and _not_ about possible debug information from a high-level language.
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This is especially relevant to DWARF2, since the compiler may emit line
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number directives that the assembler resolves. */
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enum debug_info_type
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{
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DEBUG_UNSPECIFIED,
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DEBUG_NONE,
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DEBUG_STABS,
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DEBUG_ECOFF,
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DEBUG_DWARF,
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DEBUG_DWARF2,
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DEBUG_CODEVIEW
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};
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extern enum debug_info_type debug_type;
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extern int use_gnu_debug_info_extensions;
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COMMON bool flag_dwarf_sections;
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extern int flag_dwarf_cie_version;
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extern unsigned int dwarf_level;
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/* Maximum level of macro nesting. */
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extern int max_macro_nest;
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/* Verbosity level. */
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extern int verbose;
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struct obstack;
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/* Obstack chunk size. Keep large for efficient space use, make small to
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increase malloc calls for monitoring memory allocation. */
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extern int chunksize;
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struct _pseudo_type
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{
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/* assembler mnemonic, lower case, no '.' */
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const char *poc_name;
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/* Do the work */
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void (*poc_handler) (int);
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/* Value to pass to handler */
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int poc_val;
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};
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typedef struct _pseudo_type pseudo_typeS;
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#if (__GNUC__ >= 2) && !defined(VMS)
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/* for use with -Wformat */
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#if __GNUC__ == 2 && __GNUC_MINOR__ < 6
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/* Support for double underscores in attribute names was added in gcc
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2.6, so avoid them if we are using an earlier version. */
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#define __printf__ printf
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#define __format__ format
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#endif
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#define PRINTF_LIKE(FCN) \
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void FCN (const char *format, ...) \
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__attribute__ ((__format__ (__printf__, 1, 2)))
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#define PRINTF_WHERE_LIKE(FCN) \
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void FCN (const char *file, unsigned int line, const char *format, ...) \
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__attribute__ ((__format__ (__printf__, 3, 4)))
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#define PRINTF_INDENT_LIKE(FCN) \
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void FCN (const char *file, unsigned int line, unsigned int indent, \
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const char *format, ...) \
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__attribute__ ((__format__ (__printf__, 4, 5)))
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#else /* __GNUC__ < 2 || defined(VMS) */
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#define PRINTF_LIKE(FCN) void FCN (const char *format, ...)
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#define PRINTF_WHERE_LIKE(FCN) void FCN (const char *file, \
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unsigned int line, \
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const char *format, ...)
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#define PRINTF_INDENT_LIKE(FCN) void FCN (const char *file, \
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unsigned int line, \
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unsigned int indent, \
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const char *format, ...)
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#endif /* __GNUC__ < 2 || defined(VMS) */
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PRINTF_LIKE (as_bad);
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PRINTF_LIKE (as_fatal) ATTRIBUTE_NORETURN;
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PRINTF_LIKE (as_tsktsk);
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PRINTF_LIKE (as_warn);
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PRINTF_WHERE_LIKE (as_bad_where);
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PRINTF_WHERE_LIKE (as_warn_where);
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PRINTF_INDENT_LIKE (as_info_where);
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void as_abort (const char *, int, const char *) ATTRIBUTE_NORETURN;
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void signal_init (void);
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int had_errors (void);
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int had_warnings (void);
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void as_warn_value_out_of_range (const char *, offsetT, offsetT, offsetT,
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const char *, unsigned);
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void as_bad_value_out_of_range (const char *, offsetT, offsetT, offsetT,
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const char *, unsigned);
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void print_version_id (void);
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char * app_push (void);
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/* Number of littlenums required to hold an extended precision number. */
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#define MAX_LITTLENUMS 6
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char * atof_ieee (char *, int, LITTLENUM_TYPE *);
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char * atof_ieee_detail (char *, int, int, LITTLENUM_TYPE *, FLONUM_TYPE *);
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const char * ieee_md_atof (int, char *, int *, bool);
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const char * vax_md_atof (int, char *, int *);
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char * input_scrub_include_file (const char *, char *);
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void input_scrub_insert_line (const char *);
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void input_scrub_insert_file (char *);
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char * input_scrub_new_file (const char *);
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char * input_scrub_next_buffer (char **bufp);
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||
size_t do_scrub_chars (size_t (*get) (char *, size_t), char *, size_t);
|
||
size_t do_scrub_pending (void);
|
||
bool scan_for_multibyte_characters (const unsigned char *, const unsigned char *, bool);
|
||
int gen_to_words (LITTLENUM_TYPE *, int, long);
|
||
int had_err (void);
|
||
int ignore_input (void);
|
||
void cond_finish_check (int);
|
||
void cond_exit_macro (int);
|
||
int seen_at_least_1_file (void);
|
||
void app_pop (char *);
|
||
void as_report_context (void);
|
||
const char * as_where (unsigned int *);
|
||
const char * as_where_top (unsigned int *);
|
||
const char * as_where_physical (unsigned int *);
|
||
void bump_line_counters (void);
|
||
void do_scrub_begin (int);
|
||
void input_scrub_begin (void);
|
||
void input_scrub_close (void);
|
||
void input_scrub_end (void);
|
||
void new_logical_line (const char *, int);
|
||
void new_logical_line_flags (const char *, int, int);
|
||
void subsegs_begin (void);
|
||
void subsegs_end (struct obstack **);
|
||
void subseg_change (segT, int);
|
||
segT subseg_new (const char *, subsegT);
|
||
segT subseg_force_new (const char *, subsegT);
|
||
void subseg_set (segT, subsegT);
|
||
int subseg_text_p (segT);
|
||
int seg_not_empty_p (segT);
|
||
void start_dependencies (char *);
|
||
void register_dependency (const char *);
|
||
void print_dependencies (void);
|
||
segT subseg_get (const char *, int);
|
||
|
||
char *remap_debug_filename (const char *);
|
||
void add_debug_prefix_map (const char *);
|
||
|
||
static inline char *
|
||
xmemdup0 (const char *in, size_t len)
|
||
{
|
||
return xmemdup (in, len, len + 1);
|
||
}
|
||
|
||
struct expressionS;
|
||
struct fix;
|
||
typedef struct symbol symbolS;
|
||
typedef struct frag fragS;
|
||
|
||
/* literal.c */
|
||
valueT add_to_literal_pool (symbolS *, valueT, segT, int);
|
||
|
||
int check_eh_frame (struct expressionS *, unsigned int *);
|
||
int eh_frame_estimate_size_before_relax (fragS *);
|
||
int eh_frame_relax_frag (fragS *);
|
||
void eh_frame_convert_frag (fragS *);
|
||
void eh_begin (void);
|
||
int generic_force_reloc (struct fix *);
|
||
|
||
/* SFrame FRE optimization. */
|
||
int sframe_estimate_size_before_relax (fragS *);
|
||
int sframe_relax_frag (fragS *);
|
||
void sframe_convert_frag (fragS *);
|
||
|
||
#include "expr.h" /* Before targ-*.h */
|
||
|
||
/* This one starts the chain of target dependent headers. */
|
||
#include "targ-env.h"
|
||
|
||
#ifdef OBJ_MAYBE_ELF
|
||
#define IS_ELF (OUTPUT_FLAVOR == bfd_target_elf_flavour)
|
||
#else
|
||
#ifdef OBJ_ELF
|
||
#define IS_ELF 1
|
||
#else
|
||
#define IS_ELF 0
|
||
#endif
|
||
#endif
|
||
|
||
#include "write.h"
|
||
#include "frags.h"
|
||
#include "read.h"
|
||
#include "symbols.h"
|
||
#include "hashtab.h"
|
||
#include "hash.h"
|
||
|
||
#include "tc.h"
|
||
#include "obj.h"
|
||
|
||
#ifdef USE_EMULATIONS
|
||
#include "emul.h"
|
||
#endif
|
||
#include "listing.h"
|
||
|
||
#ifdef H_TICK_HEX
|
||
extern int enable_h_tick_hex;
|
||
#endif
|
||
|
||
#ifdef TC_M68K
|
||
/* True if we are assembling in m68k MRI mode. */
|
||
COMMON int flag_m68k_mri;
|
||
#define DOLLAR_AMBIGU flag_m68k_mri
|
||
#else
|
||
#define flag_m68k_mri 0
|
||
#endif
|
||
|
||
#ifndef TC_STRING_ESCAPES
|
||
#define TC_STRING_ESCAPES 1
|
||
#endif
|
||
|
||
#ifdef WARN_COMMENTS
|
||
COMMON int warn_comment;
|
||
COMMON unsigned int found_comment;
|
||
COMMON const char * found_comment_file;
|
||
#endif
|
||
|
||
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
|
||
/* If .size directive failure should be error or warning. */
|
||
COMMON int flag_allow_nonconst_size;
|
||
|
||
/* If we should generate ELF common symbols with the STT_COMMON type. */
|
||
extern int flag_use_elf_stt_common;
|
||
|
||
/* TRUE iff GNU Build attribute notes should
|
||
be generated if none are in the input files. */
|
||
extern bool flag_generate_build_notes;
|
||
|
||
/* If section name substitution sequences should be honored */
|
||
COMMON int flag_sectname_subst;
|
||
#endif
|
||
|
||
#ifndef DOLLAR_AMBIGU
|
||
#define DOLLAR_AMBIGU 0
|
||
#endif
|
||
|
||
#ifndef NUMBERS_WITH_SUFFIX
|
||
#define NUMBERS_WITH_SUFFIX 0
|
||
#endif
|
||
|
||
#ifndef LOCAL_LABELS_DOLLAR
|
||
#define LOCAL_LABELS_DOLLAR 0
|
||
#endif
|
||
|
||
#ifndef LOCAL_LABELS_FB
|
||
#define LOCAL_LABELS_FB 0
|
||
#endif
|
||
|
||
#ifndef LABELS_WITHOUT_COLONS
|
||
#define LABELS_WITHOUT_COLONS 0
|
||
#endif
|
||
|
||
#ifndef NO_PSEUDO_DOT
|
||
#define NO_PSEUDO_DOT 0
|
||
#endif
|
||
|
||
#ifndef TEXT_SECTION_NAME
|
||
#define TEXT_SECTION_NAME ".text"
|
||
#define DATA_SECTION_NAME ".data"
|
||
#define BSS_SECTION_NAME ".bss"
|
||
#endif
|
||
|
||
#ifndef OCTETS_PER_BYTE_POWER
|
||
#define OCTETS_PER_BYTE_POWER 0
|
||
#endif
|
||
#ifndef OCTETS_PER_BYTE
|
||
#define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
|
||
#endif
|
||
#if OCTETS_PER_BYTE != (1<<OCTETS_PER_BYTE_POWER)
|
||
#error "Octets per byte conflicts with its power-of-two definition!"
|
||
#endif
|
||
|
||
#if defined OBJ_ELF || defined OBJ_MAYBE_ELF
|
||
/* On ELF platforms, mark debug sections with SEC_ELF_OCTETS */
|
||
#define SEC_OCTETS (IS_ELF ? SEC_ELF_OCTETS : 0)
|
||
#else
|
||
#define SEC_OCTETS 0
|
||
#endif
|
||
|
||
#define POISON_BFD_BOOLEAN 1
|
||
|
||
#endif /* GAS */
|