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925c058e93
* config/tc-m32r.c (enable_m32rx): New static global. (enable_special,warn_explicit_parallel_conflicts,optimize): Ditto. (allow_m32rx): New function. (M32R_SHORTOPTS): Add `O'. (md_longopts): Add --m32rx plus several warning options. (md_parse_option): Handle new options. (md_show_usage): Print them. (md_begin): Enable m32rx. (OPERAND_IS_COND_BIT): New macro. (first_writes_to_seconds_operands): New function. (writes_to_pc,can_make_parallel,make_parallel): New functions. (target_make_parallel,assemble_two_insns): New functions. (md_assemble): Recognize "insn1 -> insn2" and "insn1 || insn2". If optimizing and m32rx, try to make consecutive insns parallel.
1899 lines
53 KiB
C
1899 lines
53 KiB
C
/* tc-m32r.c -- Assembler for the Mitsubishi M32R.
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Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation.
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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 2, 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,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public 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
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <stdio.h>
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#include <ctype.h>
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#include "as.h"
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#include "subsegs.h"
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#include "symcat.h"
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#include "opcodes/m32r-desc.h"
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#include "opcodes/m32r-opc.h"
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#include "cgen.h"
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/* Linked list of symbols that are debugging symbols to be defined as the
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beginning of the current instruction. */
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typedef struct sym_link
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{
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struct sym_link *next;
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symbolS *symbol;
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} sym_linkS;
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static sym_linkS *debug_sym_link = (sym_linkS *)0;
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/* Structure to hold all of the different components describing
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an individual instruction. */
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typedef struct
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{
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const CGEN_INSN * insn;
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const CGEN_INSN * orig_insn;
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CGEN_FIELDS fields;
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#if CGEN_INT_INSN_P
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CGEN_INSN_INT buffer [1];
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#define INSN_VALUE(buf) (*(buf))
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#else
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unsigned char buffer [CGEN_MAX_INSN_SIZE];
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#define INSN_VALUE(buf) (buf)
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#endif
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char * addr;
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fragS * frag;
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int num_fixups;
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fixS * fixups [GAS_CGEN_MAX_FIXUPS];
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int indices [MAX_OPERAND_INSTANCES];
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sym_linkS *debug_sym_link;
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}
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m32r_insn;
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/* prev_insn.insn is non-null if last insn was a 16 bit insn on a 32 bit
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boundary (i.e. was the first of two 16 bit insns). */
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static m32r_insn prev_insn;
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/* Non-zero if we've seen a relaxable insn since the last 32 bit
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alignment request. */
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static int seen_relaxable_p = 0;
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/* Non-zero if -relax specified, in which case sufficient relocs are output
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for the linker to do relaxing.
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We do simple forms of relaxing internally, but they are always done.
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This flag does not apply to them. */
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static int m32r_relax;
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#if 0 /* not supported yet */
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/* If non-NULL, pointer to cpu description file to read.
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This allows runtime additions to the assembler. */
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static const char * m32r_cpu_desc;
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#endif
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/* Non-zero if warn when a high/shigh reloc has no matching low reloc.
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Each high/shigh reloc must be paired with it's low cousin in order to
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properly calculate the addend in a relocatable link (since there is a
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potential carry from the low to the high/shigh).
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This option is off by default though for user-written assembler code it
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might make sense to make the default be on (i.e. have gcc pass a flag
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to turn it off). This warning must not be on for GCC created code as
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optimization may delete the low but not the high/shigh (at least we
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shouldn't assume or require it to). */
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static int warn_unmatched_high = 0;
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/* Non-zero if -m32rx has been specified, in which case support for the
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extended M32RX instruction set should be enabled. */
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static int enable_m32rx = 0;
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/* Non-zero if -m32rx -hidden has been specified, in which case support for
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the special M32RX instruction set should be enabled. */
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static int enable_special = 0;
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/* Non-zero if the programmer should be warned when an explicit parallel
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instruction might have constraint violations. */
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static int warn_explicit_parallel_conflicts = 1;
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/* Non-zero if insns can be made parallel. */
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static int optimize;
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/* stuff for .scomm symbols. */
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static segT sbss_section;
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static asection scom_section;
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static asymbol scom_symbol;
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const char comment_chars[] = ";";
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const char line_comment_chars[] = "#";
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const char line_separator_chars[] = "";
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const char EXP_CHARS[] = "eE";
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const char FLT_CHARS[] = "dD";
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/* Relocations against symbols are done in two
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parts, with a HI relocation and a LO relocation. Each relocation
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has only 16 bits of space to store an addend. This means that in
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order for the linker to handle carries correctly, it must be able
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to locate both the HI and the LO relocation. This means that the
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relocations must appear in order in the relocation table.
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In order to implement this, we keep track of each unmatched HI
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relocation. We then sort them so that they immediately precede the
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corresponding LO relocation. */
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struct m32r_hi_fixup
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{
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struct m32r_hi_fixup * next; /* Next HI fixup. */
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fixS * fixp; /* This fixup. */
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segT seg; /* The section this fixup is in. */
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};
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/* The list of unmatched HI relocs. */
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static struct m32r_hi_fixup * m32r_hi_fixup_list;
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static void
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allow_m32rx (on)
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int on;
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{
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enable_m32rx = on;
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if (stdoutput != NULL)
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bfd_set_arch_mach (stdoutput, TARGET_ARCH,
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enable_m32rx ? bfd_mach_m32rx : bfd_mach_m32r);
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}
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#define M32R_SHORTOPTS "O"
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const char * md_shortopts = M32R_SHORTOPTS;
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struct option md_longopts[] =
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{
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#define OPTION_M32RX (OPTION_MD_BASE)
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{"m32rx", no_argument, NULL, OPTION_M32RX},
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#define OPTION_WARN_PARALLEL (OPTION_MD_BASE + 1)
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{"warn-explicit-parallel-conflicts", no_argument, NULL, OPTION_WARN_PARALLEL},
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{"Wp", no_argument, NULL, OPTION_WARN_PARALLEL},
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#define OPTION_NO_WARN_PARALLEL (OPTION_MD_BASE + 2)
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{"no-warn-explicit-parallel-conflicts", no_argument, NULL, OPTION_NO_WARN_PARALLEL},
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{"Wnp", no_argument, NULL, OPTION_NO_WARN_PARALLEL},
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#define OPTION_SPECIAL (OPTION_MD_BASE + 3)
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{"hidden", no_argument, NULL, OPTION_SPECIAL},
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/* Sigh. I guess all warnings must now have both variants. */
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#define OPTION_WARN_UNMATCHED (OPTION_MD_BASE + 4)
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{"warn-unmatched-high", no_argument, NULL, OPTION_WARN_UNMATCHED},
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{"Wuh", no_argument, NULL, OPTION_WARN_UNMATCHED},
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#define OPTION_NO_WARN_UNMATCHED (OPTION_MD_BASE + 5)
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{"no-warn-unmatched-high", no_argument, NULL, OPTION_NO_WARN_UNMATCHED},
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{"Wnuh", no_argument, NULL, OPTION_NO_WARN_UNMATCHED},
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#if 0 /* not supported yet */
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#define OPTION_RELAX (OPTION_MD_BASE + 6)
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{"relax", no_argument, NULL, OPTION_RELAX},
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#define OPTION_CPU_DESC (OPTION_MD_BASE + 7)
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{"cpu-desc", required_argument, NULL, OPTION_CPU_DESC},
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#endif
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{NULL, no_argument, NULL, 0}
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};
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size_t md_longopts_size = sizeof (md_longopts);
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int
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md_parse_option (c, arg)
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int c;
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char * arg;
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{
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switch (c)
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{
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case 'O':
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optimize = 1;
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break;
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case OPTION_M32RX:
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allow_m32rx (1);
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break;
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case OPTION_WARN_PARALLEL:
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warn_explicit_parallel_conflicts = 1;
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break;
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case OPTION_NO_WARN_PARALLEL:
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warn_explicit_parallel_conflicts = 0;
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break;
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case OPTION_SPECIAL:
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if (enable_m32rx)
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enable_special = 1;
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else
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{
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/* Pretend that we do not recognise this option. */
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as_bad (_("Unrecognised option: -hidden"));
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return 0;
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}
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break;
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case OPTION_WARN_UNMATCHED:
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warn_unmatched_high = 1;
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break;
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case OPTION_NO_WARN_UNMATCHED:
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warn_unmatched_high = 0;
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break;
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#if 0 /* not supported yet */
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case OPTION_RELAX:
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m32r_relax = 1;
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break;
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case OPTION_CPU_DESC:
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m32r_cpu_desc = arg;
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break;
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#endif
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default:
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return 0;
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}
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return 1;
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}
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void
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md_show_usage (stream)
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FILE * stream;
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{
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fprintf (stream, _(" M32R specific command line options:\n"));
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fprintf (stream, _("\
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-m32rx support the extended m32rx instruction set\n"));
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fprintf (stream, _("\
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-O try to combine instructions in parallel\n"));
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fprintf (stream, _("\
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-warn-explicit-parallel-conflicts warn when parallel instructions\n"));
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fprintf (stream, _("\
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violate contraints\n"));
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fprintf (stream, _("\
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-no-warn-explicit-parallel-conflicts do not warn when parallel\n"));
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fprintf (stream, _("\
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instructions violate contraints\n"));
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fprintf (stream, _("\
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-Wp synonym for -warn-explicit-parallel-conflicts\n"));
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fprintf (stream, _("\
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-Wnp synonym for -no-warn-explicit-parallel-conflicts\n"));
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fprintf (stream, _("\
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-warn-unmatched-high warn when an (s)high reloc has no matching low reloc\n"));
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fprintf (stream, _("\
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-no-warn-unmatched-high do not warn about missing low relocs\n"));
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fprintf (stream, _("\
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-Wuh synonym for -warn-unmatched-high\n"));
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fprintf (stream, _("\
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-Wnuh synonym for -no-warn-unmatched-high\n"));
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#if 0
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fprintf (stream, _("\
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-relax create linker relaxable code\n"));
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fprintf (stream, _("\
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-cpu-desc provide runtime cpu description file\n"));
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#endif
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}
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static void fill_insn PARAMS ((int));
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static void m32r_scomm PARAMS ((int));
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static void debug_sym PARAMS ((int));
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static void expand_debug_syms PARAMS ((sym_linkS *, int));
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/* Set by md_assemble for use by m32r_fill_insn. */
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static subsegT prev_subseg;
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static segT prev_seg;
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/* The target specific pseudo-ops which we support. */
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const pseudo_typeS md_pseudo_table[] =
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{
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{ "word", cons, 4 },
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{ "fillinsn", fill_insn, 0 },
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{ "scomm", m32r_scomm, 0 },
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{ "debugsym", debug_sym, 0 },
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/* Not documented as so far there is no need for them.... */
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{ "m32r", allow_m32rx, 0 },
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{ "m32rx", allow_m32rx, 1 },
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{ NULL, NULL, 0 }
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};
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/* FIXME: Should be machine generated. */
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#define NOP_INSN 0x7000
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#define PAR_NOP_INSN 0xf000 /* can only be used in 2nd slot */
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/* When we align the .text section, insert the correct NOP pattern.
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N is the power of 2 alignment. LEN is the length of pattern FILL.
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MAX is the maximum number of characters to skip when doing the alignment,
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or 0 if there is no maximum. */
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int
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m32r_do_align (n, fill, len, max)
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int n;
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const char * fill;
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int len;
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int max;
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{
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/* Only do this if the fill pattern wasn't specified. */
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if (fill == NULL
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&& subseg_text_p (now_seg)
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/* Only do this special handling if aligning to at least a
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4 byte boundary. */
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&& n > 1
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/* Only do this special handling if we're allowed to emit at
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least two bytes. */
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&& (max == 0 || max > 1))
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{
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static const unsigned char nop_pattern[] = { 0xf0, 0x00 };
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#if 0
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/* First align to a 2 byte boundary, in case there is an odd .byte. */
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/* FIXME: How much memory will cause gas to use when assembling a big
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program? Perhaps we can avoid the frag_align call? */
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frag_align (1, 0, 0);
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#endif
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/* Next align to a 4 byte boundary (we know n >= 2) using a parallel
|
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nop. */
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frag_align_pattern (2, nop_pattern, sizeof nop_pattern, 0);
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/* If doing larger alignments use a repeating sequence of appropriate
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nops. */
|
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if (n > 2)
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{
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static const unsigned char multi_nop_pattern[] =
|
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{ 0x70, 0x00, 0xf0, 0x00 };
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frag_align_pattern (n, multi_nop_pattern, sizeof multi_nop_pattern,
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max ? max - 2 : 0);
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}
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prev_insn.insn = NULL;
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return 1;
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}
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return 0;
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}
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/* If the last instruction was the first of 2 16 bit insns,
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output a nop to move the PC to a 32 bit boundary.
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This is done via an alignment specification since branch relaxing
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may make it unnecessary.
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Internally, we need to output one of these each time a 32 bit insn is
|
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seen after an insn that is relaxable. */
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static void
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fill_insn (ignore)
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int ignore;
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{
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(void) m32r_do_align (2, NULL, 0, 0);
|
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prev_insn.insn = NULL;
|
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seen_relaxable_p = 0;
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}
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|
||
/* Record the symbol so that when we output the insn, we can create
|
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a symbol that is at the start of the instruction. This is used
|
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to emit the label for the start of a breakpoint without causing
|
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the assembler to emit a NOP if the previous instruction was a
|
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16 bit instruction. */
|
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|
||
static void
|
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debug_sym (ignore)
|
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int ignore;
|
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{
|
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register char *name;
|
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register char delim;
|
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register char *end_name;
|
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register symbolS *symbolP;
|
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register sym_linkS *link;
|
||
|
||
name = input_line_pointer;
|
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delim = get_symbol_end ();
|
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end_name = input_line_pointer;
|
||
|
||
if ((symbolP = symbol_find (name)) == NULL
|
||
&& (symbolP = md_undefined_symbol (name)) == NULL)
|
||
{
|
||
symbolP = symbol_new (name, undefined_section, 0, &zero_address_frag);
|
||
}
|
||
|
||
symbol_table_insert (symbolP);
|
||
if (S_IS_DEFINED (symbolP) && S_GET_SEGMENT (symbolP) != reg_section)
|
||
/* xgettext:c-format */
|
||
as_bad (_("symbol `%s' already defined"), S_GET_NAME (symbolP));
|
||
|
||
else
|
||
{
|
||
link = (sym_linkS *) xmalloc (sizeof (sym_linkS));
|
||
link->symbol = symbolP;
|
||
link->next = debug_sym_link;
|
||
debug_sym_link = link;
|
||
symbol_get_obj (symbolP)->local = 1;
|
||
}
|
||
|
||
*end_name = delim;
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
/* Second pass to expanding the debug symbols, go through linked
|
||
list of symbols and reassign the address. */
|
||
|
||
static void
|
||
expand_debug_syms (syms, align)
|
||
sym_linkS *syms;
|
||
int align;
|
||
{
|
||
char *save_input_line = input_line_pointer;
|
||
sym_linkS *next_syms;
|
||
|
||
if (!syms)
|
||
return;
|
||
|
||
(void) m32r_do_align (align, NULL, 0, 0);
|
||
for (; syms != (sym_linkS *)0; syms = next_syms)
|
||
{
|
||
symbolS *symbolP = syms->symbol;
|
||
next_syms = syms->next;
|
||
input_line_pointer = ".\n";
|
||
pseudo_set (symbolP);
|
||
free ((char *)syms);
|
||
}
|
||
|
||
input_line_pointer = save_input_line;
|
||
}
|
||
|
||
/* Cover function to fill_insn called after a label and at end of assembly.
|
||
The result is always 1: we're called in a conditional to see if the
|
||
current line is a label. */
|
||
|
||
int
|
||
m32r_fill_insn (done)
|
||
int done;
|
||
{
|
||
if (prev_seg != NULL)
|
||
{
|
||
segT seg = now_seg;
|
||
subsegT subseg = now_subseg;
|
||
|
||
subseg_set (prev_seg, prev_subseg);
|
||
|
||
fill_insn (0);
|
||
|
||
subseg_set (seg, subseg);
|
||
}
|
||
|
||
if (done && debug_sym_link)
|
||
{
|
||
expand_debug_syms (debug_sym_link, 1);
|
||
debug_sym_link = (sym_linkS *)0;
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
void
|
||
md_begin ()
|
||
{
|
||
flagword applicable;
|
||
segT seg;
|
||
subsegT subseg;
|
||
|
||
/* Initialize the `cgen' interface. */
|
||
|
||
/* Set the machine number and endian. */
|
||
gas_cgen_cpu_desc = m32r_cgen_cpu_open (CGEN_CPU_OPEN_MACHS, 0,
|
||
CGEN_CPU_OPEN_ENDIAN,
|
||
CGEN_ENDIAN_BIG,
|
||
CGEN_CPU_OPEN_END);
|
||
m32r_cgen_init_asm (gas_cgen_cpu_desc);
|
||
|
||
/* The operand instance table is used during optimization to determine
|
||
which insns can be executed in parallel. It is also used to give
|
||
warnings regarding operand interference in parallel insns. */
|
||
m32r_cgen_init_opinst_table (gas_cgen_cpu_desc);
|
||
|
||
/* This is a callback from cgen to gas to parse operands. */
|
||
cgen_set_parse_operand_fn (gas_cgen_cpu_desc, gas_cgen_parse_operand);
|
||
|
||
#if 0 /* not supported yet */
|
||
/* If a runtime cpu description file was provided, parse it. */
|
||
if (m32r_cpu_desc != NULL)
|
||
{
|
||
const char * errmsg;
|
||
|
||
errmsg = cgen_read_cpu_file (gas_cgen_cpu_desc, m32r_cpu_desc);
|
||
if (errmsg != NULL)
|
||
as_bad ("%s: %s", m32r_cpu_desc, errmsg);
|
||
}
|
||
#endif
|
||
|
||
/* Save the current subseg so we can restore it [it's the default one and
|
||
we don't want the initial section to be .sbss]. */
|
||
seg = now_seg;
|
||
subseg = now_subseg;
|
||
|
||
/* The sbss section is for local .scomm symbols. */
|
||
sbss_section = subseg_new (".sbss", 0);
|
||
|
||
/* This is copied from perform_an_assembly_pass. */
|
||
applicable = bfd_applicable_section_flags (stdoutput);
|
||
bfd_set_section_flags (stdoutput, sbss_section, applicable & SEC_ALLOC);
|
||
|
||
#if 0 /* What does this do? [see perform_an_assembly_pass] */
|
||
seg_info (bss_section)->bss = 1;
|
||
#endif
|
||
|
||
subseg_set (seg, subseg);
|
||
|
||
/* We must construct a fake section similar to bfd_com_section
|
||
but with the name .scommon. */
|
||
scom_section = bfd_com_section;
|
||
scom_section.name = ".scommon";
|
||
scom_section.output_section = & scom_section;
|
||
scom_section.symbol = & scom_symbol;
|
||
scom_section.symbol_ptr_ptr = & scom_section.symbol;
|
||
scom_symbol = * bfd_com_section.symbol;
|
||
scom_symbol.name = ".scommon";
|
||
scom_symbol.section = & scom_section;
|
||
|
||
allow_m32rx (enable_m32rx);
|
||
}
|
||
|
||
#define OPERAND_IS_COND_BIT(operand, indices, index) \
|
||
((operand)->hw_type == HW_H_COND \
|
||
|| ((operand)->hw_type == HW_H_PSW) \
|
||
|| ((operand)->hw_type == HW_H_CR \
|
||
&& (indices [index] == 0 || indices [index] == 1)))
|
||
|
||
/* Returns true if an output of instruction 'a' is referenced by an operand
|
||
of instruction 'b'. If 'check_outputs' is true then b's outputs are
|
||
checked, otherwise its inputs are examined. */
|
||
|
||
static int
|
||
first_writes_to_seconds_operands (a, b, check_outputs)
|
||
m32r_insn * a;
|
||
m32r_insn * b;
|
||
const int check_outputs;
|
||
{
|
||
const CGEN_OPINST * a_operands = CGEN_INSN_OPERANDS (a->insn);
|
||
const CGEN_OPINST * b_ops = CGEN_INSN_OPERANDS (b->insn);
|
||
int a_index;
|
||
|
||
/* If at least one of the instructions takes no operands, then there is
|
||
nothing to check. There really are instructions without operands,
|
||
eg 'nop'. */
|
||
if (a_operands == NULL || b_ops == NULL)
|
||
return 0;
|
||
|
||
/* Scan the operand list of 'a' looking for an output operand. */
|
||
for (a_index = 0;
|
||
a_operands->type != CGEN_OPINST_END;
|
||
a_index ++, a_operands ++)
|
||
{
|
||
if (a_operands->type == CGEN_OPINST_OUTPUT)
|
||
{
|
||
int b_index;
|
||
const CGEN_OPINST * b_operands = b_ops;
|
||
|
||
/* Special Case:
|
||
The Condition bit 'C' is a shadow of the CBR register (control
|
||
register 1) and also a shadow of bit 31 of the program status
|
||
word (control register 0). For now this is handled here, rather
|
||
than by cgen.... */
|
||
|
||
if (OPERAND_IS_COND_BIT (a_operands, a->indices, a_index))
|
||
{
|
||
/* Scan operand list of 'b' looking for another reference to the
|
||
condition bit, which goes in the right direction. */
|
||
for (b_index = 0;
|
||
b_operands->type != CGEN_OPINST_END;
|
||
b_index ++, b_operands ++)
|
||
{
|
||
if ((b_operands->type
|
||
== (check_outputs
|
||
? CGEN_OPINST_OUTPUT
|
||
: CGEN_OPINST_INPUT))
|
||
&& OPERAND_IS_COND_BIT (b_operands, b->indices, b_index))
|
||
return 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Scan operand list of 'b' looking for an operand that
|
||
references the same hardware element, and which goes in the
|
||
right direction. */
|
||
for (b_index = 0;
|
||
b_operands->type != CGEN_OPINST_END;
|
||
b_index ++, b_operands ++)
|
||
{
|
||
if ((b_operands->type
|
||
== (check_outputs
|
||
? CGEN_OPINST_OUTPUT
|
||
: CGEN_OPINST_INPUT))
|
||
&& (b_operands->hw_type == a_operands->hw_type)
|
||
&& (a->indices [a_index] == b->indices [b_index]))
|
||
return 1;
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
/* Returns true if the insn can (potentially) alter the program counter. */
|
||
|
||
static int
|
||
writes_to_pc (a)
|
||
m32r_insn * a;
|
||
{
|
||
#if 0 /* Once PC operands are working.... */
|
||
const CGEN_OPINST * a_operands == CGEN_INSN_OPERANDS (gas_cgen_cpu_desc,
|
||
a->insn);
|
||
|
||
if (a_operands == NULL)
|
||
return 0;
|
||
|
||
while (a_operands->type != CGEN_OPINST_END)
|
||
{
|
||
if (a_operands->operand != NULL
|
||
&& CGEN_OPERAND_INDEX (gas_cgen_cpu_desc, a_operands->operand) == M32R_OPERAND_PC)
|
||
return 1;
|
||
|
||
a_operands ++;
|
||
}
|
||
#else
|
||
if (CGEN_INSN_ATTR_VALUE (a->insn, CGEN_INSN_UNCOND_CTI)
|
||
|| CGEN_INSN_ATTR_VALUE (a->insn, CGEN_INSN_COND_CTI))
|
||
return 1;
|
||
#endif
|
||
return 0;
|
||
}
|
||
|
||
/* Returns NULL if the two 16 bit insns can be executed in parallel,
|
||
otherwise it returns a pointer to an error message explaining why not. */
|
||
|
||
static const char *
|
||
can_make_parallel (a, b)
|
||
m32r_insn * a;
|
||
m32r_insn * b;
|
||
{
|
||
PIPE_ATTR a_pipe;
|
||
PIPE_ATTR b_pipe;
|
||
|
||
/* Make sure the instructions are the right length. */
|
||
if ( CGEN_FIELDS_BITSIZE (& a->fields) != 16
|
||
|| CGEN_FIELDS_BITSIZE (& b->fields) != 16)
|
||
abort();
|
||
|
||
if (first_writes_to_seconds_operands (a, b, true))
|
||
return _("Instructions write to the same destination register.");
|
||
|
||
a_pipe = CGEN_INSN_ATTR_VALUE (a->insn, CGEN_INSN_PIPE);
|
||
b_pipe = CGEN_INSN_ATTR_VALUE (b->insn, CGEN_INSN_PIPE);
|
||
|
||
/* Make sure that the instructions use the correct execution pipelines. */
|
||
if ( a_pipe == PIPE_NONE
|
||
|| b_pipe == PIPE_NONE)
|
||
return _("Instructions do not use parallel execution pipelines.");
|
||
|
||
/* Leave this test for last, since it is the only test that can
|
||
go away if the instructions are swapped, and we want to make
|
||
sure that any other errors are detected before this happens. */
|
||
if ( a_pipe == PIPE_S
|
||
|| b_pipe == PIPE_O)
|
||
return _("Instructions share the same execution pipeline");
|
||
|
||
return NULL;
|
||
}
|
||
|
||
/* Force the top bit of the second 16-bit insn to be set. */
|
||
|
||
static void
|
||
make_parallel (buffer)
|
||
CGEN_INSN_BYTES_PTR buffer;
|
||
{
|
||
#if CGEN_INT_INSN_P
|
||
*buffer |= 0x8000;
|
||
#else
|
||
buffer [CGEN_CPU_ENDIAN (gas_cgen_cpu_desc) == CGEN_ENDIAN_BIG ? 0 : 1]
|
||
|= 0x80;
|
||
#endif
|
||
}
|
||
|
||
/* Same as make_parallel except buffer contains the bytes in target order. */
|
||
|
||
static void
|
||
target_make_parallel (buffer)
|
||
char *buffer;
|
||
{
|
||
buffer [CGEN_CPU_ENDIAN (gas_cgen_cpu_desc) == CGEN_ENDIAN_BIG ? 0 : 1]
|
||
|= 0x80;
|
||
}
|
||
|
||
/* Assemble two instructions with an explicit parallel operation (||) or
|
||
sequential operation (->). */
|
||
|
||
static void
|
||
assemble_two_insns (str, str2, parallel_p)
|
||
char * str;
|
||
char * str2;
|
||
int parallel_p;
|
||
{
|
||
char * str3;
|
||
m32r_insn first;
|
||
m32r_insn second;
|
||
char * errmsg;
|
||
char save_str2 = *str2;
|
||
|
||
* str2 = 0; /* Seperate the two instructions. */
|
||
|
||
/* Make sure the two insns begin on a 32 bit boundary.
|
||
This is also done for the serial case (foo -> bar), relaxing doesn't
|
||
affect insns written like this.
|
||
Note that we must always do this as we can't assume anything about
|
||
whether we're currently on a 32 bit boundary or not. Relaxing may
|
||
change this. */
|
||
fill_insn (0);
|
||
|
||
first.debug_sym_link = debug_sym_link;
|
||
debug_sym_link = (sym_linkS *)0;
|
||
|
||
/* Parse the first instruction. */
|
||
if (! (first.insn = m32r_cgen_assemble_insn
|
||
(gas_cgen_cpu_desc, str, & first.fields, first.buffer, & errmsg)))
|
||
{
|
||
as_bad (errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Check it. */
|
||
if (CGEN_FIELDS_BITSIZE (&first.fields) != 16)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("not a 16 bit instruction '%s'"), str);
|
||
return;
|
||
}
|
||
else if (! enable_special
|
||
&& CGEN_INSN_ATTR_VALUE (first.insn, CGEN_INSN_SPECIAL))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("unknown instruction '%s'"), str);
|
||
return;
|
||
}
|
||
else if (! enable_m32rx
|
||
/* FIXME: Need standard macro to perform this test. */
|
||
&& CGEN_INSN_ATTR_VALUE (first.insn, CGEN_INSN_MACH) == (1 << MACH_M32RX))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("instruction '%s' is for the M32RX only"), str);
|
||
return;
|
||
}
|
||
|
||
/* Check to see if this is an allowable parallel insn. */
|
||
if (parallel_p && CGEN_INSN_ATTR_VALUE (first.insn, CGEN_INSN_PIPE) == PIPE_NONE)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("instruction '%s' cannot be executed in parallel."), str);
|
||
return;
|
||
}
|
||
|
||
*str2 = save_str2; /* Restore the original assembly text, just in case it is needed. */
|
||
str3 = str; /* Save the original string pointer. */
|
||
str = str2 + 2; /* Advanced past the parsed string. */
|
||
str2 = str3; /* Remember the entire string in case it is needed for error messages. */
|
||
|
||
/* Convert the opcode to lower case. */
|
||
{
|
||
char *s2 = str;
|
||
|
||
while (isspace (*s2 ++))
|
||
continue;
|
||
|
||
--s2;
|
||
|
||
while (isalnum (*s2))
|
||
{
|
||
if (isupper ((unsigned char) *s2))
|
||
*s2 = tolower (*s2);
|
||
s2 ++;
|
||
}
|
||
}
|
||
|
||
/* Preserve any fixups that have been generated and reset the list to empty. */
|
||
gas_cgen_save_fixups ();
|
||
|
||
/* Get the indices of the operands of the instruction. */
|
||
/* FIXME: CGEN_FIELDS is already recorded, but relying on that fact
|
||
doesn't seem right. Perhaps allow passing fields like we do insn. */
|
||
/* FIXME: ALIAS insns do not have operands, so we use this function
|
||
to find the equivalent insn and overwrite the value stored in our
|
||
structure. We still need the original insn, however, since this
|
||
may have certain attributes that are not present in the unaliased
|
||
version (eg relaxability). When aliases behave differently this
|
||
may have to change. */
|
||
first.orig_insn = first.insn;
|
||
{
|
||
CGEN_FIELDS tmp_fields;
|
||
first.insn = cgen_lookup_get_insn_operands
|
||
(gas_cgen_cpu_desc, NULL, INSN_VALUE (first.buffer), NULL, 16,
|
||
first.indices, &tmp_fields);
|
||
}
|
||
|
||
if (first.insn == NULL)
|
||
as_fatal (_("internal error: lookup/get operands failed"));
|
||
|
||
second.debug_sym_link = NULL;
|
||
|
||
/* Parse the second instruction. */
|
||
if (! (second.insn = m32r_cgen_assemble_insn
|
||
(gas_cgen_cpu_desc, str, & second.fields, second.buffer, & errmsg)))
|
||
{
|
||
as_bad (errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Check it. */
|
||
if (CGEN_FIELDS_BITSIZE (&second.fields) != 16)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("not a 16 bit instruction '%s'"), str);
|
||
return;
|
||
}
|
||
else if (! enable_special
|
||
&& CGEN_INSN_ATTR_VALUE (second.insn, CGEN_INSN_SPECIAL))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("unknown instruction '%s'"), str);
|
||
return;
|
||
}
|
||
else if (! enable_m32rx
|
||
&& CGEN_INSN_ATTR_VALUE (second.insn, CGEN_INSN_MACH) == (1 << MACH_M32RX))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("instruction '%s' is for the M32RX only"), str);
|
||
return;
|
||
}
|
||
|
||
/* Check to see if this is an allowable parallel insn. */
|
||
if (parallel_p && CGEN_INSN_ATTR_VALUE (second.insn, CGEN_INSN_PIPE) == PIPE_NONE)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("instruction '%s' cannot be executed in parallel."), str);
|
||
return;
|
||
}
|
||
|
||
if (parallel_p && ! enable_m32rx)
|
||
{
|
||
if (CGEN_INSN_NUM (first.insn) != M32R_INSN_NOP
|
||
&& CGEN_INSN_NUM (second.insn) != M32R_INSN_NOP)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("'%s': only the NOP instruction can be issued in parallel on the m32r"), str2);
|
||
return;
|
||
}
|
||
}
|
||
|
||
/* Get the indices of the operands of the instruction. */
|
||
second.orig_insn = second.insn;
|
||
{
|
||
CGEN_FIELDS tmp_fields;
|
||
second.insn = cgen_lookup_get_insn_operands
|
||
(gas_cgen_cpu_desc, NULL, INSN_VALUE (second.buffer), NULL, 16,
|
||
second.indices, &tmp_fields);
|
||
}
|
||
|
||
if (second.insn == NULL)
|
||
as_fatal (_("internal error: lookup/get operands failed"));
|
||
|
||
/* We assume that if the first instruction writes to a register that is
|
||
read by the second instruction it is because the programmer intended
|
||
this to happen, (after all they have explicitly requested that these
|
||
two instructions be executed in parallel). Although if the global
|
||
variable warn_explicit_parallel_conflicts is true then we do generate
|
||
a warning message. Similarly we assume that parallel branch and jump
|
||
instructions are deliberate and should not produce errors. */
|
||
|
||
if (parallel_p && warn_explicit_parallel_conflicts)
|
||
{
|
||
if (first_writes_to_seconds_operands (& first, & second, false))
|
||
/* xgettext:c-format */
|
||
as_warn (_("%s: output of 1st instruction is the same as an input to 2nd instruction - is this intentional ?"), str2);
|
||
|
||
if (first_writes_to_seconds_operands (& second, & first, false))
|
||
/* xgettext:c-format */
|
||
as_warn (_("%s: output of 2nd instruction is the same as an input to 1st instruction - is this intentional ?"), str2);
|
||
}
|
||
|
||
if (!parallel_p
|
||
|| (errmsg = (char *) can_make_parallel (& first, & second)) == NULL)
|
||
{
|
||
/* Get the fixups for the first instruction. */
|
||
gas_cgen_swap_fixups ();
|
||
|
||
/* Write it out. */
|
||
expand_debug_syms (first.debug_sym_link, 1);
|
||
gas_cgen_finish_insn (first.orig_insn, first.buffer,
|
||
CGEN_FIELDS_BITSIZE (& first.fields), 0, NULL);
|
||
|
||
/* Force the top bit of the second insn to be set. */
|
||
if (parallel_p)
|
||
make_parallel (second.buffer);
|
||
|
||
/* Get its fixups. */
|
||
gas_cgen_restore_fixups ();
|
||
|
||
/* Write it out. */
|
||
expand_debug_syms (second.debug_sym_link, 1);
|
||
gas_cgen_finish_insn (second.orig_insn, second.buffer,
|
||
CGEN_FIELDS_BITSIZE (& second.fields), 0, NULL);
|
||
}
|
||
/* Try swapping the instructions to see if they work that way. */
|
||
else if (can_make_parallel (& second, & first) == NULL)
|
||
{
|
||
/* Write out the second instruction first. */
|
||
expand_debug_syms (second.debug_sym_link, 1);
|
||
gas_cgen_finish_insn (second.orig_insn, second.buffer,
|
||
CGEN_FIELDS_BITSIZE (& second.fields), 0, NULL);
|
||
|
||
/* Force the top bit of the first instruction to be set. */
|
||
make_parallel (first.buffer);
|
||
|
||
/* Get the fixups for the first instruction. */
|
||
gas_cgen_restore_fixups ();
|
||
|
||
/* Write out the first instruction. */
|
||
expand_debug_syms (first.debug_sym_link, 1);
|
||
gas_cgen_finish_insn (first.orig_insn, first.buffer,
|
||
CGEN_FIELDS_BITSIZE (& first.fields), 0, NULL);
|
||
}
|
||
else
|
||
{
|
||
as_bad ("'%s': %s", str2, errmsg);
|
||
return;
|
||
}
|
||
|
||
/* Set these so m32r_fill_insn can use them. */
|
||
prev_seg = now_seg;
|
||
prev_subseg = now_subseg;
|
||
}
|
||
|
||
void
|
||
md_assemble (str)
|
||
char * str;
|
||
{
|
||
m32r_insn insn;
|
||
char * errmsg;
|
||
char * str2 = NULL;
|
||
|
||
/* Initialize GAS's cgen interface for a new instruction. */
|
||
gas_cgen_init_parse ();
|
||
|
||
/* Look for a parallel instruction seperator. */
|
||
if ((str2 = strstr (str, "||")) != NULL)
|
||
{
|
||
assemble_two_insns (str, str2, 1);
|
||
return;
|
||
}
|
||
|
||
/* Also look for a sequential instruction seperator. */
|
||
if ((str2 = strstr (str, "->")) != NULL)
|
||
{
|
||
assemble_two_insns (str, str2, 0);
|
||
return;
|
||
}
|
||
|
||
insn.debug_sym_link = debug_sym_link;
|
||
debug_sym_link = (sym_linkS *)0;
|
||
|
||
insn.insn = m32r_cgen_assemble_insn
|
||
(gas_cgen_cpu_desc, str, & insn.fields, insn.buffer, & errmsg);
|
||
|
||
if (!insn.insn)
|
||
{
|
||
as_bad (errmsg);
|
||
return;
|
||
}
|
||
|
||
if (! enable_special
|
||
&& CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_SPECIAL))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("unknown instruction '%s'"), str);
|
||
return;
|
||
}
|
||
else if (! enable_m32rx
|
||
&& CGEN_INSN_ATTR_VALUE (insn.insn, CGEN_INSN_MACH) == (1 << MACH_M32RX))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("instruction '%s' is for the M32RX only"), str);
|
||
return;
|
||
}
|
||
|
||
if (CGEN_INSN_BITSIZE (insn.insn) == 32)
|
||
{
|
||
/* 32 bit insns must live on 32 bit boundaries. */
|
||
if (prev_insn.insn || seen_relaxable_p)
|
||
{
|
||
/* ??? If calling fill_insn too many times turns us into a memory
|
||
pig, can we call a fn to assemble a nop instead of
|
||
!seen_relaxable_p? */
|
||
fill_insn (0);
|
||
}
|
||
|
||
expand_debug_syms (insn.debug_sym_link, 2);
|
||
|
||
/* Doesn't really matter what we pass for RELAX_P here. */
|
||
gas_cgen_finish_insn (insn.insn, insn.buffer,
|
||
CGEN_FIELDS_BITSIZE (& insn.fields), 1, NULL);
|
||
}
|
||
else
|
||
{
|
||
int on_32bit_boundary_p;
|
||
int swap = false;
|
||
|
||
if (CGEN_INSN_BITSIZE (insn.insn) != 16)
|
||
abort();
|
||
|
||
insn.orig_insn = insn.insn;
|
||
|
||
/* If the previous insn was relaxable, then it may be expanded
|
||
to fill the current 16 bit slot. Emit a NOP here to occupy
|
||
this slot, so that we can start at optimizing at a 32 bit
|
||
boundary. */
|
||
if (prev_insn.insn && seen_relaxable_p && optimize)
|
||
fill_insn (0);
|
||
|
||
if (enable_m32rx)
|
||
{
|
||
/* Get the indices of the operands of the instruction.
|
||
FIXME: See assemble_parallel for notes on orig_insn. */
|
||
{
|
||
CGEN_FIELDS tmp_fields;
|
||
insn.insn = cgen_lookup_get_insn_operands
|
||
(gas_cgen_cpu_desc, NULL, INSN_VALUE (insn.buffer), NULL,
|
||
16, insn.indices, &tmp_fields);
|
||
}
|
||
|
||
if (insn.insn == NULL)
|
||
as_fatal (_("internal error: lookup/get operands failed"));
|
||
}
|
||
|
||
/* Compute whether we're on a 32 bit boundary or not.
|
||
prev_insn.insn is NULL when we're on a 32 bit boundary. */
|
||
on_32bit_boundary_p = prev_insn.insn == NULL;
|
||
|
||
/* Look to see if this instruction can be combined with the
|
||
previous instruction to make one, parallel, 32 bit instruction.
|
||
If the previous instruction (potentially) changed the flow of
|
||
program control, then it cannot be combined with the current
|
||
instruction. If the current instruction is relaxable, then it
|
||
might be replaced with a longer version, so we cannot combine it.
|
||
Also if the output of the previous instruction is used as an
|
||
input to the current instruction then it cannot be combined.
|
||
Otherwise call can_make_parallel() with both orderings of the
|
||
instructions to see if they can be combined. */
|
||
if ( ! on_32bit_boundary_p
|
||
&& enable_m32rx
|
||
&& optimize
|
||
&& CGEN_INSN_ATTR_VALUE (insn.orig_insn, CGEN_INSN_RELAXABLE) == 0
|
||
&& ! writes_to_pc (& prev_insn)
|
||
&& ! first_writes_to_seconds_operands (& prev_insn, &insn, false)
|
||
)
|
||
{
|
||
if (can_make_parallel (& prev_insn, & insn) == NULL)
|
||
make_parallel (insn.buffer);
|
||
else if (can_make_parallel (& insn, & prev_insn) == NULL)
|
||
swap = true;
|
||
}
|
||
|
||
expand_debug_syms (insn.debug_sym_link, 1);
|
||
|
||
{
|
||
int i;
|
||
finished_insnS fi;
|
||
|
||
/* Ensure each pair of 16 bit insns is in the same frag. */
|
||
frag_grow (4);
|
||
|
||
gas_cgen_finish_insn (insn.orig_insn, insn.buffer,
|
||
CGEN_FIELDS_BITSIZE (& insn.fields),
|
||
1 /*relax_p*/, &fi);
|
||
insn.addr = fi.addr;
|
||
insn.frag = fi.frag;
|
||
insn.num_fixups = fi.num_fixups;
|
||
for (i = 0; i < fi.num_fixups; ++i)
|
||
insn.fixups[i] = fi.fixups[i];
|
||
}
|
||
|
||
if (swap)
|
||
{
|
||
int i,tmp;
|
||
|
||
#define SWAP_BYTES(a,b) tmp = a; a = b; b = tmp
|
||
|
||
/* Swap the two insns */
|
||
SWAP_BYTES (prev_insn.addr [0], insn.addr [0]);
|
||
SWAP_BYTES (prev_insn.addr [1], insn.addr [1]);
|
||
|
||
target_make_parallel (insn.addr);
|
||
|
||
/* Swap any relaxable frags recorded for the two insns. */
|
||
/* FIXME: Clarify. relaxation precludes parallel insns */
|
||
if (prev_insn.frag->fr_opcode == prev_insn.addr)
|
||
prev_insn.frag->fr_opcode = insn.addr;
|
||
else if (insn.frag->fr_opcode == insn.addr)
|
||
insn.frag->fr_opcode = prev_insn.addr;
|
||
|
||
/* Update the addresses in any fixups.
|
||
Note that we don't have to handle the case where each insn is in
|
||
a different frag as we ensure they're in the same frag above. */
|
||
for (i = 0; i < prev_insn.num_fixups; ++i)
|
||
prev_insn.fixups[i]->fx_where += 2;
|
||
for (i = 0; i < insn.num_fixups; ++i)
|
||
insn.fixups[i]->fx_where -= 2;
|
||
}
|
||
|
||
/* Keep track of whether we've seen a pair of 16 bit insns.
|
||
prev_insn.insn is NULL when we're on a 32 bit boundary. */
|
||
if (on_32bit_boundary_p)
|
||
prev_insn = insn;
|
||
else
|
||
prev_insn.insn = NULL;
|
||
|
||
/* If the insn needs the following one to be on a 32 bit boundary
|
||
(e.g. subroutine calls), fill this insn's slot. */
|
||
if (on_32bit_boundary_p
|
||
&& CGEN_INSN_ATTR_VALUE (insn.orig_insn, CGEN_INSN_FILL_SLOT) != 0)
|
||
fill_insn (0);
|
||
|
||
/* If this is a relaxable insn (can be replaced with a larger version)
|
||
mark the fact so that we can emit an alignment directive for a
|
||
following 32 bit insn if we see one. */
|
||
if (CGEN_INSN_ATTR_VALUE (insn.orig_insn, CGEN_INSN_RELAXABLE) != 0)
|
||
seen_relaxable_p = 1;
|
||
}
|
||
|
||
/* Set these so m32r_fill_insn can use them. */
|
||
prev_seg = now_seg;
|
||
prev_subseg = now_subseg;
|
||
}
|
||
|
||
/* The syntax in the manual says constants begin with '#'.
|
||
We just ignore it. */
|
||
|
||
void
|
||
md_operand (expressionP)
|
||
expressionS * expressionP;
|
||
{
|
||
if (* input_line_pointer == '#')
|
||
{
|
||
input_line_pointer ++;
|
||
expression (expressionP);
|
||
}
|
||
}
|
||
|
||
valueT
|
||
md_section_align (segment, size)
|
||
segT segment;
|
||
valueT size;
|
||
{
|
||
int align = bfd_get_section_alignment (stdoutput, segment);
|
||
return ((size + (1 << align) - 1) & (-1 << align));
|
||
}
|
||
|
||
symbolS *
|
||
md_undefined_symbol (name)
|
||
char * name;
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
/* .scomm pseudo-op handler.
|
||
|
||
This is a new pseudo-op to handle putting objects in .scommon.
|
||
By doing this the linker won't need to do any work and more importantly
|
||
it removes the implicit -G arg necessary to correctly link the object file.
|
||
*/
|
||
|
||
static void
|
||
m32r_scomm (ignore)
|
||
int ignore;
|
||
{
|
||
register char * name;
|
||
register char c;
|
||
register char * p;
|
||
offsetT size;
|
||
register symbolS * symbolP;
|
||
offsetT align;
|
||
int align2;
|
||
|
||
name = input_line_pointer;
|
||
c = get_symbol_end ();
|
||
|
||
/* just after name is now '\0' */
|
||
p = input_line_pointer;
|
||
* p = c;
|
||
SKIP_WHITESPACE ();
|
||
if (* input_line_pointer != ',')
|
||
{
|
||
as_bad (_("Expected comma after symbol-name: rest of line ignored."));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
input_line_pointer ++; /* skip ',' */
|
||
if ((size = get_absolute_expression ()) < 0)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_warn (_(".SCOMMon length (%ld.) <0! Ignored."), (long) size);
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
/* The third argument to .scomm is the alignment. */
|
||
if (* input_line_pointer != ',')
|
||
align = 8;
|
||
else
|
||
{
|
||
++ input_line_pointer;
|
||
align = get_absolute_expression ();
|
||
if (align <= 0)
|
||
{
|
||
as_warn (_("ignoring bad alignment"));
|
||
align = 8;
|
||
}
|
||
}
|
||
/* Convert to a power of 2 alignment. */
|
||
if (align)
|
||
{
|
||
for (align2 = 0; (align & 1) == 0; align >>= 1, ++ align2)
|
||
continue;
|
||
if (align != 1)
|
||
{
|
||
as_bad (_("Common alignment not a power of 2"));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
}
|
||
else
|
||
align2 = 0;
|
||
|
||
* p = 0;
|
||
symbolP = symbol_find_or_make (name);
|
||
* p = c;
|
||
|
||
if (S_IS_DEFINED (symbolP))
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("Ignoring attempt to re-define symbol `%s'."),
|
||
S_GET_NAME (symbolP));
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
if (S_GET_VALUE (symbolP) && S_GET_VALUE (symbolP) != (valueT) size)
|
||
{
|
||
/* xgettext:c-format */
|
||
as_bad (_("Length of .scomm \"%s\" is already %ld. Not changed to %ld."),
|
||
S_GET_NAME (symbolP),
|
||
(long) S_GET_VALUE (symbolP),
|
||
(long) size);
|
||
|
||
ignore_rest_of_line ();
|
||
return;
|
||
}
|
||
|
||
if (symbol_get_obj (symbolP)->local)
|
||
{
|
||
segT old_sec = now_seg;
|
||
int old_subsec = now_subseg;
|
||
char * pfrag;
|
||
|
||
record_alignment (sbss_section, align2);
|
||
subseg_set (sbss_section, 0);
|
||
|
||
if (align2)
|
||
frag_align (align2, 0, 0);
|
||
|
||
if (S_GET_SEGMENT (symbolP) == sbss_section)
|
||
symbol_get_frag (symbolP)->fr_symbol = 0;
|
||
|
||
symbol_set_frag (symbolP, frag_now);
|
||
|
||
pfrag = frag_var (rs_org, 1, 1, (relax_substateT) 0, symbolP, size,
|
||
(char *) 0);
|
||
* pfrag = 0;
|
||
S_SET_SIZE (symbolP, size);
|
||
S_SET_SEGMENT (symbolP, sbss_section);
|
||
S_CLEAR_EXTERNAL (symbolP);
|
||
subseg_set (old_sec, old_subsec);
|
||
}
|
||
else
|
||
{
|
||
S_SET_VALUE (symbolP, (valueT) size);
|
||
S_SET_ALIGN (symbolP, align2);
|
||
S_SET_EXTERNAL (symbolP);
|
||
S_SET_SEGMENT (symbolP, & scom_section);
|
||
}
|
||
|
||
demand_empty_rest_of_line ();
|
||
}
|
||
|
||
/* Interface to relax_segment. */
|
||
|
||
/* FIXME: Build table by hand, get it working, then machine generate. */
|
||
|
||
const relax_typeS md_relax_table[] =
|
||
{
|
||
/* The fields are:
|
||
1) most positive reach of this state,
|
||
2) most negative reach of this state,
|
||
3) how many bytes this mode will add to the size of the current frag
|
||
4) which index into the table to try if we can't fit into this one. */
|
||
|
||
/* The first entry must be unused because an `rlx_more' value of zero ends
|
||
each list. */
|
||
{1, 1, 0, 0},
|
||
|
||
/* The displacement used by GAS is from the end of the 2 byte insn,
|
||
so we subtract 2 from the following. */
|
||
/* 16 bit insn, 8 bit disp -> 10 bit range.
|
||
This doesn't handle a branch in the right slot at the border:
|
||
the "& -4" isn't taken into account. It's not important enough to
|
||
complicate things over it, so we subtract an extra 2 (or + 2 in -ve
|
||
case). */
|
||
{511 - 2 - 2, -512 - 2 + 2, 0, 2 },
|
||
/* 32 bit insn, 24 bit disp -> 26 bit range. */
|
||
{0x2000000 - 1 - 2, -0x2000000 - 2, 2, 0 },
|
||
/* Same thing, but with leading nop for alignment. */
|
||
{0x2000000 - 1 - 2, -0x2000000 - 2, 4, 0 }
|
||
};
|
||
|
||
long
|
||
m32r_relax_frag (fragP, stretch)
|
||
fragS * fragP;
|
||
long stretch;
|
||
{
|
||
/* Address of branch insn. */
|
||
long address = fragP->fr_address + fragP->fr_fix - 2;
|
||
long growth = 0;
|
||
|
||
/* Keep 32 bit insns aligned on 32 bit boundaries. */
|
||
if (fragP->fr_subtype == 2)
|
||
{
|
||
if ((address & 3) != 0)
|
||
{
|
||
fragP->fr_subtype = 3;
|
||
growth = 2;
|
||
}
|
||
}
|
||
else if (fragP->fr_subtype == 3)
|
||
{
|
||
if ((address & 3) == 0)
|
||
{
|
||
fragP->fr_subtype = 2;
|
||
growth = -2;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
growth = relax_frag (fragP, stretch);
|
||
|
||
/* Long jump on odd halfword boundary? */
|
||
if (fragP->fr_subtype == 2 && (address & 3) != 0)
|
||
{
|
||
fragP->fr_subtype = 3;
|
||
growth += 2;
|
||
}
|
||
}
|
||
|
||
return growth;
|
||
}
|
||
|
||
/* Return an initial guess of the length by which a fragment must grow to
|
||
hold a branch to reach its destination.
|
||
Also updates fr_type/fr_subtype as necessary.
|
||
|
||
Called just before doing relaxation.
|
||
Any symbol that is now undefined will not become defined.
|
||
The guess for fr_var is ACTUALLY the growth beyond fr_fix.
|
||
Whatever we do to grow fr_fix or fr_var contributes to our returned value.
|
||
Although it may not be explicit in the frag, pretend fr_var starts with a
|
||
0 value. */
|
||
|
||
int
|
||
md_estimate_size_before_relax (fragP, segment)
|
||
fragS * fragP;
|
||
segT segment;
|
||
{
|
||
int old_fr_fix = fragP->fr_fix;
|
||
|
||
/* The only thing we have to handle here are symbols outside of the
|
||
current segment. They may be undefined or in a different segment in
|
||
which case linker scripts may place them anywhere.
|
||
However, we can't finish the fragment here and emit the reloc as insn
|
||
alignment requirements may move the insn about. */
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != segment)
|
||
{
|
||
/* The symbol is undefined in this segment.
|
||
Change the relaxation subtype to the max allowable and leave
|
||
all further handling to md_convert_frag. */
|
||
fragP->fr_subtype = 2;
|
||
|
||
#if 0 /* Can't use this, but leave in for illustration. */
|
||
/* Change 16 bit insn to 32 bit insn. */
|
||
fragP->fr_opcode[0] |= 0x80;
|
||
|
||
/* Increase known (fixed) size of fragment. */
|
||
fragP->fr_fix += 2;
|
||
|
||
/* Create a relocation for it. */
|
||
fix_new (fragP, old_fr_fix, 4,
|
||
fragP->fr_symbol,
|
||
fragP->fr_offset, 1 /* pcrel */,
|
||
/* FIXME: Can't use a real BFD reloc here.
|
||
gas_cgen_md_apply_fix3 can't handle it. */
|
||
BFD_RELOC_M32R_26_PCREL);
|
||
|
||
/* Mark this fragment as finished. */
|
||
frag_wane (fragP);
|
||
#else
|
||
{
|
||
const CGEN_INSN * insn;
|
||
int i;
|
||
|
||
/* Update the recorded insn.
|
||
Fortunately we don't have to look very far.
|
||
FIXME: Change this to record in the instruction the next higher
|
||
relaxable insn to use. */
|
||
for (i = 0, insn = fragP->fr_cgen.insn; i < 4; i++, insn++)
|
||
{
|
||
if ((strcmp (CGEN_INSN_MNEMONIC (insn),
|
||
CGEN_INSN_MNEMONIC (fragP->fr_cgen.insn))
|
||
== 0)
|
||
&& CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_RELAX))
|
||
break;
|
||
}
|
||
if (i == 4)
|
||
abort ();
|
||
|
||
fragP->fr_cgen.insn = insn;
|
||
return 2;
|
||
}
|
||
#endif
|
||
}
|
||
|
||
return (fragP->fr_var + fragP->fr_fix - old_fr_fix);
|
||
}
|
||
|
||
/* *fragP has been relaxed to its final size, and now needs to have
|
||
the bytes inside it modified to conform to the new size.
|
||
|
||
Called after relaxation is finished.
|
||
fragP->fr_type == rs_machine_dependent.
|
||
fragP->fr_subtype is the subtype of what the address relaxed to. */
|
||
|
||
void
|
||
md_convert_frag (abfd, sec, fragP)
|
||
bfd * abfd;
|
||
segT sec;
|
||
fragS * fragP;
|
||
{
|
||
char * opcode;
|
||
char * displacement;
|
||
int target_address;
|
||
int opcode_address;
|
||
int extension;
|
||
int addend;
|
||
|
||
opcode = fragP->fr_opcode;
|
||
|
||
/* Address opcode resides at in file space. */
|
||
opcode_address = fragP->fr_address + fragP->fr_fix - 2;
|
||
|
||
switch (fragP->fr_subtype)
|
||
{
|
||
case 1 :
|
||
extension = 0;
|
||
displacement = & opcode[1];
|
||
break;
|
||
case 2 :
|
||
opcode[0] |= 0x80;
|
||
extension = 2;
|
||
displacement = & opcode[1];
|
||
break;
|
||
case 3 :
|
||
opcode[2] = opcode[0] | 0x80;
|
||
md_number_to_chars (opcode, PAR_NOP_INSN, 2);
|
||
opcode_address += 2;
|
||
extension = 4;
|
||
displacement = & opcode[3];
|
||
break;
|
||
default :
|
||
abort ();
|
||
}
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
|
||
{
|
||
/* symbol must be resolved by linker */
|
||
if (fragP->fr_offset & 3)
|
||
as_warn (_("Addend to unresolved symbol not on word boundary."));
|
||
addend = fragP->fr_offset >> 2;
|
||
}
|
||
else
|
||
{
|
||
/* Address we want to reach in file space. */
|
||
target_address = S_GET_VALUE (fragP->fr_symbol) + fragP->fr_offset;
|
||
target_address += symbol_get_frag (fragP->fr_symbol)->fr_address;
|
||
addend = (target_address - (opcode_address & -4)) >> 2;
|
||
}
|
||
|
||
/* Create a relocation for symbols that must be resolved by the linker.
|
||
Otherwise output the completed insn. */
|
||
|
||
if (S_GET_SEGMENT (fragP->fr_symbol) != sec)
|
||
{
|
||
assert (fragP->fr_subtype != 1);
|
||
assert (fragP->fr_cgen.insn != 0);
|
||
gas_cgen_record_fixup (fragP,
|
||
/* Offset of branch insn in frag. */
|
||
fragP->fr_fix + extension - 4,
|
||
fragP->fr_cgen.insn,
|
||
4 /*length*/,
|
||
/* FIXME: quick hack */
|
||
#if 0
|
||
cgen_operand_lookup_by_num (gas_cgen_cpu_desc,
|
||
fragP->fr_cgen.opindex),
|
||
#else
|
||
cgen_operand_lookup_by_num (gas_cgen_cpu_desc,
|
||
M32R_OPERAND_DISP24),
|
||
#endif
|
||
fragP->fr_cgen.opinfo,
|
||
fragP->fr_symbol, fragP->fr_offset);
|
||
}
|
||
|
||
#define SIZE_FROM_RELAX_STATE(n) ((n) == 1 ? 1 : 3)
|
||
|
||
md_number_to_chars (displacement, (valueT) addend,
|
||
SIZE_FROM_RELAX_STATE (fragP->fr_subtype));
|
||
|
||
fragP->fr_fix += extension;
|
||
}
|
||
|
||
/* Functions concerning relocs. */
|
||
|
||
/* The location from which a PC relative jump should be calculated,
|
||
given a PC relative reloc. */
|
||
|
||
long
|
||
md_pcrel_from_section (fixP, sec)
|
||
fixS * fixP;
|
||
segT sec;
|
||
{
|
||
if (fixP->fx_addsy != (symbolS *) NULL
|
||
&& (! S_IS_DEFINED (fixP->fx_addsy)
|
||
|| S_GET_SEGMENT (fixP->fx_addsy) != sec))
|
||
{
|
||
/* The symbol is undefined (or is defined but not in this section).
|
||
Let the linker figure it out. */
|
||
return 0;
|
||
}
|
||
|
||
return (fixP->fx_frag->fr_address + fixP->fx_where) & -4L;
|
||
}
|
||
|
||
/* Return the bfd reloc type for OPERAND of INSN at fixup FIXP.
|
||
Returns BFD_RELOC_NONE if no reloc type can be found.
|
||
*FIXP may be modified if desired. */
|
||
|
||
bfd_reloc_code_real_type
|
||
md_cgen_lookup_reloc (insn, operand, fixP)
|
||
const CGEN_INSN * insn;
|
||
const CGEN_OPERAND * operand;
|
||
fixS * fixP;
|
||
{
|
||
switch (operand->type)
|
||
{
|
||
case M32R_OPERAND_DISP8 : return BFD_RELOC_M32R_10_PCREL;
|
||
case M32R_OPERAND_DISP16 : return BFD_RELOC_M32R_18_PCREL;
|
||
case M32R_OPERAND_DISP24 : return BFD_RELOC_M32R_26_PCREL;
|
||
case M32R_OPERAND_UIMM24 : return BFD_RELOC_M32R_24;
|
||
case M32R_OPERAND_HI16 :
|
||
case M32R_OPERAND_SLO16 :
|
||
case M32R_OPERAND_ULO16 :
|
||
/* If low/high/shigh/sda was used, it is recorded in `opinfo'. */
|
||
if (fixP->fx_cgen.opinfo != 0)
|
||
return fixP->fx_cgen.opinfo;
|
||
break;
|
||
default : /* avoid -Wall warning */
|
||
break;
|
||
}
|
||
return BFD_RELOC_NONE;
|
||
}
|
||
|
||
/* Record a HI16 reloc for later matching with its LO16 cousin. */
|
||
|
||
static void
|
||
m32r_record_hi16 (reloc_type, fixP, seg)
|
||
int reloc_type;
|
||
fixS * fixP;
|
||
segT seg;
|
||
{
|
||
struct m32r_hi_fixup * hi_fixup;
|
||
|
||
assert (reloc_type == BFD_RELOC_M32R_HI16_SLO
|
||
|| reloc_type == BFD_RELOC_M32R_HI16_ULO);
|
||
|
||
hi_fixup = ((struct m32r_hi_fixup *)
|
||
xmalloc (sizeof (struct m32r_hi_fixup)));
|
||
hi_fixup->fixp = fixP;
|
||
hi_fixup->seg = now_seg;
|
||
hi_fixup->next = m32r_hi_fixup_list;
|
||
|
||
m32r_hi_fixup_list = hi_fixup;
|
||
}
|
||
|
||
/* Called while parsing an instruction to create a fixup.
|
||
We need to check for HI16 relocs and queue them up for later sorting. */
|
||
|
||
fixS *
|
||
m32r_cgen_record_fixup_exp (frag, where, insn, length, operand, opinfo, exp)
|
||
fragS * frag;
|
||
int where;
|
||
const CGEN_INSN * insn;
|
||
int length;
|
||
const CGEN_OPERAND * operand;
|
||
int opinfo;
|
||
expressionS * exp;
|
||
{
|
||
fixS * fixP = gas_cgen_record_fixup_exp (frag, where, insn, length,
|
||
operand, opinfo, exp);
|
||
|
||
switch (operand->type)
|
||
{
|
||
case M32R_OPERAND_HI16 :
|
||
/* If low/high/shigh/sda was used, it is recorded in `opinfo'. */
|
||
if (fixP->fx_cgen.opinfo == BFD_RELOC_M32R_HI16_SLO
|
||
|| fixP->fx_cgen.opinfo == BFD_RELOC_M32R_HI16_ULO)
|
||
m32r_record_hi16 (fixP->fx_cgen.opinfo, fixP, now_seg);
|
||
break;
|
||
default : /* avoid -Wall warning */
|
||
break;
|
||
}
|
||
|
||
return fixP;
|
||
}
|
||
|
||
/* Return BFD reloc type from opinfo field in a fixS.
|
||
It's tricky using fx_r_type in m32r_frob_file because the values
|
||
are BFD_RELOC_UNUSED + operand number. */
|
||
#define FX_OPINFO_R_TYPE(f) ((f)->fx_cgen.opinfo)
|
||
|
||
/* Sort any unmatched HI16 relocs so that they immediately precede
|
||
the corresponding LO16 reloc. This is called before md_apply_fix and
|
||
tc_gen_reloc. */
|
||
|
||
void
|
||
m32r_frob_file ()
|
||
{
|
||
struct m32r_hi_fixup * l;
|
||
|
||
for (l = m32r_hi_fixup_list; l != NULL; l = l->next)
|
||
{
|
||
segment_info_type * seginfo;
|
||
int pass;
|
||
|
||
assert (FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_M32R_HI16_SLO
|
||
|| FX_OPINFO_R_TYPE (l->fixp) == BFD_RELOC_M32R_HI16_ULO);
|
||
|
||
/* Check quickly whether the next fixup happens to be a matching low. */
|
||
if (l->fixp->fx_next != NULL
|
||
&& FX_OPINFO_R_TYPE (l->fixp->fx_next) == BFD_RELOC_M32R_LO16
|
||
&& l->fixp->fx_addsy == l->fixp->fx_next->fx_addsy
|
||
&& l->fixp->fx_offset == l->fixp->fx_next->fx_offset)
|
||
continue;
|
||
|
||
/* Look through the fixups for this segment for a matching `low'.
|
||
When we find one, move the high/shigh just in front of it. We do
|
||
this in two passes. In the first pass, we try to find a
|
||
unique `low'. In the second pass, we permit multiple high's
|
||
relocs for a single `low'. */
|
||
seginfo = seg_info (l->seg);
|
||
for (pass = 0; pass < 2; pass++)
|
||
{
|
||
fixS * f;
|
||
fixS * prev;
|
||
|
||
prev = NULL;
|
||
for (f = seginfo->fix_root; f != NULL; f = f->fx_next)
|
||
{
|
||
/* Check whether this is a `low' fixup which matches l->fixp. */
|
||
if (FX_OPINFO_R_TYPE (f) == BFD_RELOC_M32R_LO16
|
||
&& f->fx_addsy == l->fixp->fx_addsy
|
||
&& f->fx_offset == l->fixp->fx_offset
|
||
&& (pass == 1
|
||
|| prev == NULL
|
||
|| (FX_OPINFO_R_TYPE (prev) != BFD_RELOC_M32R_HI16_SLO
|
||
&& FX_OPINFO_R_TYPE (prev) != BFD_RELOC_M32R_HI16_ULO)
|
||
|| prev->fx_addsy != f->fx_addsy
|
||
|| prev->fx_offset != f->fx_offset))
|
||
{
|
||
fixS ** pf;
|
||
|
||
/* Move l->fixp before f. */
|
||
for (pf = &seginfo->fix_root;
|
||
* pf != l->fixp;
|
||
pf = & (* pf)->fx_next)
|
||
assert (* pf != NULL);
|
||
|
||
* pf = l->fixp->fx_next;
|
||
|
||
l->fixp->fx_next = f;
|
||
if (prev == NULL)
|
||
seginfo->fix_root = l->fixp;
|
||
else
|
||
prev->fx_next = l->fixp;
|
||
|
||
break;
|
||
}
|
||
|
||
prev = f;
|
||
}
|
||
|
||
if (f != NULL)
|
||
break;
|
||
|
||
if (pass == 1
|
||
&& warn_unmatched_high)
|
||
as_warn_where (l->fixp->fx_file, l->fixp->fx_line,
|
||
_("Unmatched high/shigh reloc"));
|
||
}
|
||
}
|
||
}
|
||
|
||
/* See whether we need to force a relocation into the output file.
|
||
This is used to force out switch and PC relative relocations when
|
||
relaxing. */
|
||
|
||
int
|
||
m32r_force_relocation (fix)
|
||
fixS * fix;
|
||
{
|
||
if (fix->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|
||
|| fix->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
|
||
return 1;
|
||
|
||
if (! m32r_relax)
|
||
return 0;
|
||
|
||
return (fix->fx_pcrel
|
||
|| 0 /* ??? */);
|
||
}
|
||
|
||
/* Write a value out to the object file, using the appropriate endianness. */
|
||
|
||
void
|
||
md_number_to_chars (buf, val, n)
|
||
char * buf;
|
||
valueT val;
|
||
int n;
|
||
{
|
||
if (target_big_endian)
|
||
number_to_chars_bigendian (buf, val, n);
|
||
else
|
||
number_to_chars_littleendian (buf, val, n);
|
||
}
|
||
|
||
/* Turn a string in input_line_pointer into a floating point constant of type
|
||
type, and store the appropriate bytes in *litP. The number of LITTLENUMS
|
||
emitted is stored in *sizeP . An error message is returned, or NULL on OK.
|
||
*/
|
||
|
||
/* Equal to MAX_PRECISION in atof-ieee.c */
|
||
#define MAX_LITTLENUMS 6
|
||
|
||
char *
|
||
md_atof (type, litP, sizeP)
|
||
char type;
|
||
char *litP;
|
||
int *sizeP;
|
||
{
|
||
int i;
|
||
int prec;
|
||
LITTLENUM_TYPE words [MAX_LITTLENUMS];
|
||
char * t;
|
||
char * atof_ieee ();
|
||
|
||
switch (type)
|
||
{
|
||
case 'f':
|
||
case 'F':
|
||
case 's':
|
||
case 'S':
|
||
prec = 2;
|
||
break;
|
||
|
||
case 'd':
|
||
case 'D':
|
||
case 'r':
|
||
case 'R':
|
||
prec = 4;
|
||
break;
|
||
|
||
/* FIXME: Some targets allow other format chars for bigger sizes here. */
|
||
|
||
default:
|
||
* sizeP = 0;
|
||
return _("Bad call to md_atof()");
|
||
}
|
||
|
||
t = atof_ieee (input_line_pointer, type, words);
|
||
if (t)
|
||
input_line_pointer = t;
|
||
* sizeP = prec * sizeof (LITTLENUM_TYPE);
|
||
|
||
if (target_big_endian)
|
||
{
|
||
for (i = 0; i < prec; i++)
|
||
{
|
||
md_number_to_chars (litP, (valueT) words[i],
|
||
sizeof (LITTLENUM_TYPE));
|
||
litP += sizeof (LITTLENUM_TYPE);
|
||
}
|
||
}
|
||
else
|
||
{
|
||
for (i = prec - 1; i >= 0; i--)
|
||
{
|
||
md_number_to_chars (litP, (valueT) words[i],
|
||
sizeof (LITTLENUM_TYPE));
|
||
litP += sizeof (LITTLENUM_TYPE);
|
||
}
|
||
}
|
||
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
m32r_elf_section_change_hook ()
|
||
{
|
||
/* If we have reached the end of a section and we have just emitted a
|
||
16 bit insn, then emit a nop to make sure that the section ends on
|
||
a 32 bit boundary. */
|
||
|
||
if (prev_insn.insn || seen_relaxable_p)
|
||
(void) m32r_fill_insn (0);
|
||
}
|
||
|
||
boolean
|
||
m32r_fix_adjustable (fixP)
|
||
fixS *fixP;
|
||
{
|
||
|
||
if (fixP->fx_addsy == NULL)
|
||
return 1;
|
||
|
||
/* Prevent all adjustments to global symbols. */
|
||
if (S_IS_EXTERN (fixP->fx_addsy))
|
||
return 0;
|
||
if (S_IS_WEAK (fixP->fx_addsy))
|
||
return 0;
|
||
|
||
/* We need the symbol name for the VTABLE entries */
|
||
if (fixP->fx_r_type == BFD_RELOC_VTABLE_INHERIT
|
||
|| fixP->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
|
||
return 0;
|
||
|
||
return 1;
|
||
}
|