/* tc-mmix.c -- Assembler for Don Knuth's MMIX.
- Copyright (C) 2001 Free Software Foundation.
+ Copyright (C) 2001, 2002 Free Software Foundation.
This file is part of GAS, the GNU Assembler.
/* Should we merge non-zero GREG register definitions? */
static int merge_gregs = 1;
+/* Should we pass on undefined BFD_RELOC_MMIX_BASE_PLUS_OFFSET relocs
+ (missing suitable GREG definitions) to the linker? */
+static int allocate_undefined_gregs_in_linker = 0;
+
/* Should we emit built-in symbols? */
static int predefined_syms = 1;
-/* Should we anything but the listed special register name (e.g. equated
- symbols)? */
+/* Should we allow anything but the listed special register name
+ (e.g. equated symbols)? */
static int equated_spec_regs = 1;
/* Do we require standard GNU syntax? */
#define OPTION_GNU_SYNTAX (OPTION_NOSYMS + 1)
#define OPTION_GLOBALIZE_SYMBOLS (OPTION_GNU_SYNTAX + 1)
#define OPTION_FIXED_SPEC_REGS (OPTION_GLOBALIZE_SYMBOLS + 1)
+#define OPTION_LINKER_ALLOCATED_GREGS (OPTION_FIXED_SPEC_REGS + 1)
{"linkrelax", no_argument, NULL, OPTION_RELAX},
{"no-expand", no_argument, NULL, OPTION_NOEXPAND},
{"no-merge-gregs", no_argument, NULL, OPTION_NOMERGEGREG},
{"globalize-symbols", no_argument, NULL, OPTION_GLOBALIZE_SYMBOLS},
{"fixed-special-register-names", no_argument, NULL,
OPTION_FIXED_SPEC_REGS},
+ {"linker-allocated-gregs", no_argument, NULL,
+ OPTION_LINKER_ALLOCATED_GREGS},
{NULL, no_argument, NULL, 0}
};
{
case 'x':
warn_on_expansion = 0;
+ allocate_undefined_gregs_in_linker = 1;
break;
case OPTION_RELAX:
equated_spec_regs = 0;
break;
+ case OPTION_LINKER_ALLOCATED_GREGS:
+ allocate_undefined_gregs_in_linker = 1;
+ break;
+
default:
return 0;
}
fprintf (stream, _("\
-no-merge-gregs Do not merge GREG definitions with nearby values.\n"));
fprintf (stream, _("\
+ -linker-allocated-gregs If there's no suitable GREG definition for the\
+ operands of an instruction, let the linker resolve.\n"));
+ fprintf (stream, _("\
-x Do not warn when an operand to GETA, a branch,\n\
PUSHJ or JUMP is not known to be within range.\n\
- The linker will catch any errors.\n"));
+ The linker will catch any errors. Implies\n\
+ -linker-allocated-gregs."));
}
/* Step to end of line, but don't step over the end of the line. */
current_fb_label = -1;
}
- /* We also assume that the length of the instruction is determinable
- from the first format character. Currently *all* the information is
- in the first character. We need a self-contained frag since we want
- the relocation to point to the instruction, not the variant part. */
+ /* We also assume that the length of the instruction is at least 4, the
+ size of an unexpanded instruction. We need a self-contained frag
+ since we want the relocation to point to the instruction, not the
+ variant part. */
opcodep = frag_more (4);
mmix_opcode_frag = opc_fragP = frag_now;
char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
symbolS *addsy = fixP->fx_addsy;
asection *addsec = addsy == NULL ? NULL : S_GET_SEGMENT (addsy);
- bfd_vma addend = fixP->fx_offset;
asymbol *baddsy = addsy != NULL ? symbol_get_bfdsym (addsy) : NULL;
+ bfd_vma addend = val - (baddsy == NULL ? 0 : bfd_asymbol_value (baddsy));
/* A single " LOCAL expression" in the wrong section will not work when
linking to MMO; relocations for zero-content sections are then
case BFD_RELOC_8:
code = fixP->fx_r_type;
- if (addsy == NULL
- || bfd_is_abs_section (S_GET_SEGMENT (addsy)))
+ if (addsy == NULL || bfd_is_abs_section (addsec))
{
/* Resolve this reloc now, as md_apply_fix3 would have done (not
called if -linkrelax). There is no point in keeping a reloc
register contents section (that is, to a register), then we can't
resolve the relocation here. */
if (addsy != NULL
- && (bfd_is_und_section (S_GET_SEGMENT (addsy))
+ && (bfd_is_und_section (addsec)
|| strcmp (bfd_get_section_name (addsec->owner, addsec),
MMIX_REG_CONTENTS_SECTION_NAME) == 0))
{
&& (S_GET_SEGMENT (addsy) != real_reg_section
|| val > 255
|| val < 0)
- && ! bfd_is_abs_section (S_GET_SEGMENT (addsy)))
+ && ! bfd_is_abs_section (addsec))
goto badop;
/* Set the "immediate" bit of the insn if this relocation is to Z
field when the value is a numeric value, i.e. not a register. */
if ((fixP->fx_where & 3) == 3
- && (addsy == NULL
- || S_GET_SEGMENT (addsy) == absolute_section))
+ && (addsy == NULL || bfd_is_abs_section (addsec)))
buf[-3] |= IMM_OFFSET_BIT;
buf[0] = val;
case BFD_RELOC_MMIX_BASE_PLUS_OFFSET:
if (addsy != NULL
- && strcmp (bfd_get_section_name (addsec->owner, addsec),
- MMIX_REG_CONTENTS_SECTION_NAME) == 0)
+ && strcmp (bfd_get_section_name (addsec->owner, addsec),
+ MMIX_REG_CONTENTS_SECTION_NAME) == 0)
{
/* This changed into a register; the relocation is for the
register-contents section. The constant part remains zero. */
If we encounter any other defined symbol, then we must find a
suitable register and emit a reloc. */
- if (addsy == NULL
- || S_GET_SEGMENT (addsy) != real_reg_section)
+ if (addsy == NULL || addsec != real_reg_section)
{
struct mmix_symbol_gregs *gregs;
struct mmix_symbol_greg_fixes *fix;
if (S_IS_DEFINED (addsy))
{
- if (! symbol_section_p (addsy)
- && ! bfd_is_abs_section (S_GET_SEGMENT (addsy)))
+ if (! symbol_section_p (addsy) && ! bfd_is_abs_section (addsec))
as_fatal (_("internal: BFD_RELOC_MMIX_BASE_PLUS_OFFSET not resolved to section"));
/* If this is an absolute symbol sufficiently near
comparisons. */
if (lowest_data_loc != (bfd_vma) -1
&& (bfd_vma) val + 256 > lowest_data_loc
- && bfd_is_abs_section (S_GET_SEGMENT (addsy)))
+ && bfd_is_abs_section (addsec))
{
val -= (offsetT) lowest_data_loc;
addsy = section_symbol (data_section);
/* Likewise text section. */
else if (lowest_text_loc != (bfd_vma) -1
&& (bfd_vma) val + 256 > lowest_text_loc
- && bfd_is_abs_section (S_GET_SEGMENT (addsy)))
+ && bfd_is_abs_section (addsec))
{
val -= (offsetT) lowest_text_loc;
addsy = section_symbol (text_section);
gregs = *symbol_get_tc (addsy);
/* If that symbol does not have any associated GREG definitions,
- we can't do anything. FIXME: implement allocate-on-demand in
- the linker. */
+ we can't do anything. */
if (gregs == NULL
|| (fix = bsearch (&val, gregs->greg_fixes, gregs->n_gregs,
sizeof (gregs->greg_fixes[0]),
before the address we want. */
|| fix->offs + 255 < val)
{
- as_bad_where (fixP->fx_file, fixP->fx_line,
- _("no suitable GREG definition for operands"));
+ /* We can either let the linker allocate GREGs
+ automatically, or emit an error. */
+ if (allocate_undefined_gregs_in_linker)
+ {
+ /* The values in baddsy and addend are right. */
+ code = fixP->fx_r_type;
+ break;
+ }
+ else
+ as_bad_where (fixP->fx_file, fixP->fx_line,
+ _("no suitable GREG definition for operands"));
return NULL;
}
else
case BFD_RELOC_MMIX_REG:
if (addsy != NULL
- && (bfd_is_und_section (S_GET_SEGMENT (addsy))
+ && (bfd_is_und_section (addsec)
|| strcmp (bfd_get_section_name (addsec->owner, addsec),
MMIX_REG_CONTENTS_SECTION_NAME) == 0))
{
}
if (addsy != NULL
- && (S_GET_SEGMENT (addsy) != real_reg_section
+ && (addsec != real_reg_section
|| val > 255
|| val < 0)
- && ! bfd_is_und_section (S_GET_SEGMENT (addsy)))
+ && ! bfd_is_und_section (addsec))
/* Drop through to error message. */
;
else
\input texinfo @c -*-Texinfo-*-
@c Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
-@c 2001
+@c 2001, 2002
@c Free Software Foundation, Inc.
@c UPDATE!! On future updates--
@c (1) check for new machine-dep cmdline options in
This file documents the GNU Assembler "@value{AS}".
@c man begin COPYRIGHT
-Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001 Free Software Foundation, Inc.
+Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1
@end tex
@vskip 0pt plus 1filll
-Copyright @copyright{} 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001 Free Software Foundation, Inc.
+Copyright @copyright{} 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1
[@b{--fixed-special-register-names}] [@b{--globalize-symbols}]
[@b{--gnu-syntax}] [@b{--relax}] [@b{--no-predefined-symbols}]
[@b{--no-expand}] [@b{--no-merge-gregs}] [@b{-x}]
+ [@b{--linker-allocated-gregs}]
@end ifset
@ifset PDP11
-@c Copyright 2001 Free Software Foundation, Inc.
+@c Copyright 2001, 2002 Free Software Foundation, Inc.
@c This is part of the GAS manual.
@c For copying conditions, see the file as.texinfo.
@c MMIX description by Hans-Peter Nilsson, hp@bitrange.com
be expanded. It needs to be kept in mind that @code{mmixal} is both an
assembler and linker, while @code{@value{AS}} will expand instructions
that at link stage can be contracted. (Though linker relaxation isn't yet
-implemented in @code{@value{LD}}.)
+implemented in @code{@value{LD}}.) The option @samp{-x} also imples
+@samp{--linker-allocated-gregs}.
+
+@cindex @samp{--linker-allocated-gregs} command line option, MMIX
+Usually a two-operand-expression (@pxref{GREG-base}) without a matching
+@samp{GREG} directive is treated as an error by @code{@value{AS}}. When
+the option @samp{--linker-allocated-gregs} is in effect, they are instead
+passed through to the linker, which will allocate as many global registers
+as is needed.
@node MMIX-Expand
@section Instruction expansion
higher-to-lower within a file. Other than that, the exact order of
register allocation and elimination is undefined. For example, the order
is undefined when more than one file with such directives are linked
-together.
+together. With the options @samp{-x} and @samp{--linker-allocated-gregs},
+@samp{GREG} directives for two-operand cases like the one mentioned above
+can be omitted. Sufficient global registers will then be allocated by the
+linker.
@item BYTE
@cindex assembler directive BYTE, MMIX
There's no unicode support.
-The following is a list of programs in
-@url{http://www-cs-faculty.stanford.edu/~knuth/mmix-news.html} dated
-2001-08-25 (md5sum c393470cfc86fac040487d22d2bf0172) that assemble with
-@code{mmixal} but do not assemble with @code{@value{AS}}:
+The following is a list of programs in @samp{mmix.tar.gz}, available at
+@url{http://www-cs-faculty.stanford.edu/~knuth/mmix-news.html}, last
+checked with the version dated 2001-08-25 (md5sum
+c393470cfc86fac040487d22d2bf0172) that assemble with @code{mmixal} but do
+not assemble with @code{@value{AS}}:
@table @code
@item silly.mms
projects / external / binutils.git / commitdiff