968 lines
24 KiB
C
968 lines
24 KiB
C
/* Assembly backend for the OpenRISC 1000.
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Copyright (C) 2002, 2003, 2005, 2007, 2009, 2010
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Free Software Foundation, Inc.
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Contributed by Damjan Lampret <lampret@opencores.org>.
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Modified bu Johan Rydberg, <johan.rydberg@netinsight.se>.
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Based upon a29k port.
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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,
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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, 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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/* tc-a29k.c used as a template. */
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#include "safe-ctype.h"
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#include "as.h"
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#include "opcode/or32.h"
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#include "elf/or32.h"
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#define DEBUG 0
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#ifndef REGISTER_PREFIX
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#define REGISTER_PREFIX '%'
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#endif
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/* Make it easier to clone this machine desc into another one. */
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#define machine_opcode or32_opcode
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#define machine_opcodes or32_opcodes
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#define machine_ip or32_ip
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#define machine_it or32_it
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/* Handle of the OPCODE hash table. */
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static struct hash_control *op_hash = NULL;
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struct machine_it
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{
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char * error;
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unsigned long opcode;
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struct nlist * nlistp;
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expressionS exp;
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int pcrel;
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int reloc_offset; /* Offset of reloc within insn. */
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int reloc;
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}
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the_insn;
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const pseudo_typeS md_pseudo_table[] =
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{
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{"align", s_align_bytes, 4 },
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{"space", s_space, 0 },
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{"cputype", s_ignore, 0 },
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{"reg", s_lsym, 0 }, /* Register equate, same as equ. */
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{"sect", s_ignore, 0 }, /* Creation of coff sections. */
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{"proc", s_ignore, 0 }, /* Start of a function. */
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{"endproc", s_ignore, 0 }, /* Function end. */
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{"word", cons, 4 },
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{NULL, 0, 0 },
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};
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int md_short_jump_size = 4;
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int md_long_jump_size = 4;
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/* This array holds the chars that always start a comment.
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If the pre-processor is disabled, these aren't very useful. */
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const char comment_chars[] = "#";
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/* This array holds the chars that only start a comment at the beginning of
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a line. If the line seems to have the form '# 123 filename'
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.line and .file directives will appear in the pre-processed output. */
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/* Note that input_file.c hand checks for '#' at the beginning of the
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first line of the input file. This is because the compiler outputs
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#NO_APP at the beginning of its output. */
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/* Also note that comments like this one will always work. */
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const char line_comment_chars[] = "#";
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/* We needed an unused char for line separation to work around the
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lack of macros, using sed and such. */
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const char line_separator_chars[] = ";";
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/* Chars that can be used to separate mant from exp in floating point nums. */
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const char EXP_CHARS[] = "eE";
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/* Chars that mean this number is a floating point constant.
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As in 0f12.456
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or 0d1.2345e12. */
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const char FLT_CHARS[] = "rRsSfFdDxXpP";
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/* "l.jalr r9" precalculated opcode. */
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static unsigned long jalr_r9_opcode;
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static void machine_ip (char *);
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/* Set bits in machine opcode according to insn->encoding
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description and passed operand. */
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static void
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encode (const struct machine_opcode *insn,
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unsigned long *opcode,
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signed long param_val,
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char param_ch)
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{
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int opc_pos = 0;
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int param_pos = 0;
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char *enc;
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#if DEBUG
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printf (" encode: opcode=%.8lx param_val=%.8lx abs=%.8lx param_ch=%c\n",
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*opcode, param_val, abs (param_val), param_ch);
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#endif
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for (enc = insn->encoding; *enc != '\0'; enc++)
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if (*enc == param_ch)
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{
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if (enc - 2 >= insn->encoding && (*(enc - 2) == '0') && (*(enc - 1) == 'x'))
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continue;
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else
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param_pos ++;
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}
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opc_pos = 32;
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for (enc = insn->encoding; *enc != '\0';)
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{
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if ((*enc == '0') && (*(enc + 1) == 'x'))
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{
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int tmp = strtol (enc, NULL, 16);
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opc_pos -= 4;
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*opcode |= tmp << opc_pos;
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enc += 3;
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}
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else if ((*enc == '0') || (*enc == '-'))
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{
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opc_pos--;
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enc++;
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}
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else if (*enc == '1')
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{
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opc_pos--;
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*opcode |= 1 << opc_pos;
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enc++;
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}
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else if (*enc == param_ch)
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{
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opc_pos--;
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param_pos--;
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*opcode |= ((param_val >> param_pos) & 0x1) << opc_pos;
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enc++;
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}
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else if (ISALPHA (*enc))
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{
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opc_pos--;
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enc++;
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}
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else
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enc++;
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}
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#if DEBUG
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printf (" opcode=%.8lx\n", *opcode);
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#endif
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}
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/* This function is called once, at assembler startup time. It should
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set up all the tables, etc., that the MD part of the assembler will
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need. */
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void
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md_begin (void)
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{
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const char *retval = NULL;
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int lose = 0;
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int skipnext = 0;
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unsigned int i;
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/* Hash up all the opcodes for fast use later. */
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op_hash = hash_new ();
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for (i = 0; i < or32_num_opcodes; i++)
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{
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const char *name = machine_opcodes[i].name;
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if (skipnext)
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{
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skipnext = 0;
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continue;
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}
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retval = hash_insert (op_hash, name, (void *) &machine_opcodes[i]);
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if (retval != NULL)
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{
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fprintf (stderr, "internal error: can't hash `%s': %s\n",
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machine_opcodes[i].name, retval);
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lose = 1;
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}
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}
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if (lose)
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as_fatal (_("Broken assembler. No assembly attempted."));
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encode (&machine_opcodes[insn_index ("l.jalr")], &jalr_r9_opcode, 9, 'B');
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}
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/* Returns non zero if instruction is to be used. */
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static int
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check_invalid_opcode (unsigned long opcode)
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{
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return opcode == jalr_r9_opcode;
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}
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/* Assemble a single instruction. Its label has already been handled
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by the generic front end. We just parse opcode and operands, and
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produce the bytes of data and relocation. */
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void
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md_assemble (char *str)
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{
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char *toP;
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#if DEBUG
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printf ("NEW INSTRUCTION\n");
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#endif
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know (str);
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machine_ip (str);
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toP = frag_more (4);
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/* Put out the opcode. */
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md_number_to_chars (toP, the_insn.opcode, 4);
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/* Put out the symbol-dependent stuff. */
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if (the_insn.reloc != BFD_RELOC_NONE)
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{
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fix_new_exp (frag_now,
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(toP - frag_now->fr_literal + the_insn.reloc_offset),
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4, /* size */
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&the_insn.exp,
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the_insn.pcrel,
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the_insn.reloc);
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}
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}
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/* This is true of the we have issued a "lo(" or "hi"(. */
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static int waiting_for_shift = 0;
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static int mask_or_shift = 0;
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static char *
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parse_operand (char *s, expressionS *operandp, int opt)
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{
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char *save = input_line_pointer;
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char *new_pointer;
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#if DEBUG
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printf (" PROCESS NEW OPERAND(%s) == %c (%d)\n", s, opt ? opt : '!', opt);
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#endif
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input_line_pointer = s;
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if (strncasecmp (s, "HI(", 3) == 0)
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{
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waiting_for_shift = 1;
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mask_or_shift = BFD_RELOC_HI16;
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input_line_pointer += 3;
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}
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else if (strncasecmp (s, "LO(", 3) == 0)
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{
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mask_or_shift = BFD_RELOC_LO16;
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input_line_pointer += 3;
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}
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else
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mask_or_shift = 0;
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if ((*s == '(') && (*(s+1) == 'r'))
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s++;
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if ((*s == 'r') && ISDIGIT (*(s + 1)))
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{
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operandp->X_add_number = strtol (s + 1, NULL, 10);
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operandp->X_op = O_register;
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for (; (*s != ',') && (*s != '\0');)
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s++;
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input_line_pointer = save;
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return s;
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}
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expression (operandp);
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if (operandp->X_op == O_absent)
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{
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if (! opt)
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as_bad (_("missing operand"));
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else
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{
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operandp->X_add_number = 0;
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operandp->X_op = O_constant;
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}
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}
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new_pointer = input_line_pointer;
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input_line_pointer = save;
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#if DEBUG
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printf (" %s=parse_operand(%s): operandp->X_op = %u\n", new_pointer, s,
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operandp->X_op);
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#endif
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return new_pointer;
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}
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/* Instruction parsing. Takes a string containing the opcode.
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Operands are at input_line_pointer. Output is in the_insn.
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Warnings or errors are generated. */
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static void
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machine_ip (char *str)
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{
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char *s;
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const char *args;
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const struct machine_opcode *insn;
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unsigned long opcode;
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expressionS the_operand;
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expressionS *operand = &the_operand;
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unsigned int regno;
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int reloc = BFD_RELOC_NONE;
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||
|
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#if DEBUG
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printf ("machine_ip(%s)\n", str);
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#endif
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s = str;
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for (; ISALNUM (*s) || *s == '.'; ++s)
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if (ISUPPER (*s))
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*s = TOLOWER (*s);
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||
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switch (*s)
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{
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||
case '\0':
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break;
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||
|
||
case ' ': /* FIXME-SOMEDAY more whitespace. */
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*s++ = '\0';
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break;
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default:
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as_bad (_("unknown opcode1: `%s'"), str);
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return;
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||
}
|
||
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if ((insn = (struct machine_opcode *) hash_find (op_hash, str)) == NULL)
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{
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||
as_bad (_("unknown opcode2 `%s'."), str);
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return;
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||
}
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||
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||
opcode = 0;
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memset (&the_insn, '\0', sizeof (the_insn));
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the_insn.reloc = BFD_RELOC_NONE;
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||
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||
reloc = BFD_RELOC_NONE;
|
||
|
||
/* Build the opcode, checking as we go to make sure that the
|
||
operands match.
|
||
|
||
If an operand matches, we modify the_insn or opcode appropriately,
|
||
and do a "continue". If an operand fails to match, we "break". */
|
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if (insn->args[0] != '\0')
|
||
/* Prime the pump. */
|
||
s = parse_operand (s, operand, insn->args[0] == 'I');
|
||
|
||
for (args = insn->args;; ++args)
|
||
{
|
||
#if DEBUG
|
||
printf (" args = %s\n", args);
|
||
#endif
|
||
switch (*args)
|
||
{
|
||
case '\0': /* End of args. */
|
||
/* We have have 0 args, do the bazoooka! */
|
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if (args == insn->args)
|
||
encode (insn, &opcode, 0, 0);
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||
|
||
if (*s == '\0')
|
||
{
|
||
/* We are truly done. */
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||
the_insn.opcode = opcode;
|
||
if (check_invalid_opcode (opcode))
|
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as_bad (_("instruction not allowed: %s"), str);
|
||
return;
|
||
}
|
||
as_bad (_("too many operands: %s"), s);
|
||
break;
|
||
|
||
case ',': /* Must match a comma. */
|
||
if (*s++ == ',')
|
||
{
|
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reloc = BFD_RELOC_NONE;
|
||
|
||
/* Parse next operand. */
|
||
s = parse_operand (s, operand, args[1] == 'I');
|
||
#if DEBUG
|
||
printf (" ',' case: operand->X_add_number = %d, *args = %s, *s = %s\n",
|
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operand->X_add_number, args, s);
|
||
#endif
|
||
continue;
|
||
}
|
||
break;
|
||
|
||
case '(': /* Must match a (. */
|
||
s = parse_operand (s, operand, args[1] == 'I');
|
||
continue;
|
||
|
||
case ')': /* Must match a ). */
|
||
continue;
|
||
|
||
case 'r': /* A general register. */
|
||
args++;
|
||
|
||
if (operand->X_op != O_register)
|
||
break; /* Only registers. */
|
||
|
||
know (operand->X_add_symbol == 0);
|
||
know (operand->X_op_symbol == 0);
|
||
regno = operand->X_add_number;
|
||
encode (insn, &opcode, regno, *args);
|
||
#if DEBUG
|
||
printf (" r: operand->X_op = %d\n", operand->X_op);
|
||
#endif
|
||
continue;
|
||
|
||
default:
|
||
/* if (! ISALPHA (*args))
|
||
break; */ /* Only immediate values. */
|
||
|
||
if (mask_or_shift)
|
||
{
|
||
#if DEBUG
|
||
printf ("mask_or_shift = %d\n", mask_or_shift);
|
||
#endif
|
||
reloc = mask_or_shift;
|
||
}
|
||
mask_or_shift = 0;
|
||
|
||
if (strncasecmp (args, "LO(", 3) == 0)
|
||
{
|
||
#if DEBUG
|
||
printf ("reloc_const\n");
|
||
#endif
|
||
reloc = BFD_RELOC_LO16;
|
||
}
|
||
else if (strncasecmp (args, "HI(", 3) == 0)
|
||
{
|
||
#if DEBUG
|
||
printf ("reloc_consth\n");
|
||
#endif
|
||
reloc = BFD_RELOC_HI16;
|
||
}
|
||
|
||
if (*s == '(')
|
||
operand->X_op = O_constant;
|
||
else if (*s == ')')
|
||
s += 1;
|
||
#if DEBUG
|
||
printf (" default case: operand->X_add_number = %d, *args = %s, *s = %s\n", operand->X_add_number, args, s);
|
||
#endif
|
||
if (operand->X_op == O_constant)
|
||
{
|
||
if (reloc == BFD_RELOC_NONE)
|
||
{
|
||
bfd_vma v, mask;
|
||
|
||
mask = 0x3ffffff;
|
||
v = abs (operand->X_add_number) & ~ mask;
|
||
if (v)
|
||
as_bad (_("call/jmp target out of range (1)"));
|
||
}
|
||
|
||
if (reloc == BFD_RELOC_HI16)
|
||
operand->X_add_number = ((operand->X_add_number >> 16) & 0xffff);
|
||
|
||
the_insn.pcrel = 0;
|
||
encode (insn, &opcode, operand->X_add_number, *args);
|
||
/* the_insn.reloc = BFD_RELOC_NONE; */
|
||
continue;
|
||
}
|
||
|
||
if (reloc == BFD_RELOC_NONE)
|
||
the_insn.reloc = BFD_RELOC_32_GOT_PCREL;
|
||
else
|
||
the_insn.reloc = reloc;
|
||
|
||
/* the_insn.reloc = insn->reloc; */
|
||
#if DEBUG
|
||
printf (" reloc sym=%d\n", the_insn.reloc);
|
||
printf (" BFD_RELOC_NONE=%d\n", BFD_RELOC_NONE);
|
||
#endif
|
||
the_insn.exp = *operand;
|
||
|
||
/* the_insn.reloc_offset = 1; */
|
||
the_insn.pcrel = 1; /* Assume PC-relative jump. */
|
||
|
||
/* FIXME-SOON, Do we figure out whether abs later, after
|
||
know sym val? */
|
||
if (reloc == BFD_RELOC_LO16 || reloc == BFD_RELOC_HI16)
|
||
the_insn.pcrel = 0;
|
||
|
||
encode (insn, &opcode, operand->X_add_number, *args);
|
||
continue;
|
||
}
|
||
|
||
/* Types or values of args don't match. */
|
||
as_bad (_("invalid operands"));
|
||
return;
|
||
}
|
||
}
|
||
|
||
char *
|
||
md_atof (int type, char * litP, int * sizeP)
|
||
{
|
||
return ieee_md_atof (type, litP, sizeP, TRUE);
|
||
}
|
||
|
||
/* Write out big-endian. */
|
||
|
||
void
|
||
md_number_to_chars (char *buf, valueT val, int n)
|
||
{
|
||
number_to_chars_bigendian (buf, val, n);
|
||
}
|
||
|
||
void
|
||
md_apply_fix (fixS * fixP, valueT * val, segT seg ATTRIBUTE_UNUSED)
|
||
{
|
||
char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
|
||
long t_val;
|
||
|
||
t_val = (long) *val;
|
||
|
||
#if DEBUG
|
||
printf ("md_apply_fix val:%x\n", t_val);
|
||
#endif
|
||
|
||
fixP->fx_addnumber = t_val; /* Remember value for emit_reloc. */
|
||
|
||
switch (fixP->fx_r_type)
|
||
{
|
||
case BFD_RELOC_32: /* XXXXXXXX pattern in a word. */
|
||
#if DEBUG
|
||
printf ("reloc_const: val=%x\n", t_val);
|
||
#endif
|
||
buf[0] = t_val >> 24;
|
||
buf[1] = t_val >> 16;
|
||
buf[2] = t_val >> 8;
|
||
buf[3] = t_val;
|
||
break;
|
||
|
||
case BFD_RELOC_16: /* XXXX0000 pattern in a word. */
|
||
#if DEBUG
|
||
printf ("reloc_const: val=%x\n", t_val);
|
||
#endif
|
||
buf[0] = t_val >> 8;
|
||
buf[1] = t_val;
|
||
break;
|
||
|
||
case BFD_RELOC_8: /* XX000000 pattern in a word. */
|
||
#if DEBUG
|
||
printf ("reloc_const: val=%x\n", t_val);
|
||
#endif
|
||
buf[0] = t_val;
|
||
break;
|
||
|
||
case BFD_RELOC_LO16: /* 0000XXXX pattern in a word. */
|
||
#if DEBUG
|
||
printf ("reloc_const: val=%x\n", t_val);
|
||
#endif
|
||
buf[2] = t_val >> 8; /* Holds bits 0000XXXX. */
|
||
buf[3] = t_val;
|
||
break;
|
||
|
||
case BFD_RELOC_HI16: /* 0000XXXX pattern in a word. */
|
||
#if DEBUG
|
||
printf ("reloc_consth: val=%x\n", t_val);
|
||
#endif
|
||
buf[2] = t_val >> 24; /* Holds bits XXXX0000. */
|
||
buf[3] = t_val >> 16;
|
||
break;
|
||
|
||
case BFD_RELOC_32_GOT_PCREL: /* 0000XXXX pattern in a word. */
|
||
if (!fixP->fx_done)
|
||
;
|
||
else if (fixP->fx_pcrel)
|
||
{
|
||
long v = t_val >> 28;
|
||
|
||
if (v != 0 && v != -1)
|
||
as_bad_where (fixP->fx_file, fixP->fx_line,
|
||
_("call/jmp target out of range (2)"));
|
||
}
|
||
else
|
||
/* This case was supposed to be handled in machine_ip. */
|
||
abort ();
|
||
|
||
buf[0] |= (t_val >> 26) & 0x03; /* Holds bits 0FFFFFFC of address. */
|
||
buf[1] = t_val >> 18;
|
||
buf[2] = t_val >> 10;
|
||
buf[3] = t_val >> 2;
|
||
break;
|
||
|
||
case BFD_RELOC_VTABLE_INHERIT:
|
||
case BFD_RELOC_VTABLE_ENTRY:
|
||
fixP->fx_done = 0;
|
||
break;
|
||
|
||
case BFD_RELOC_NONE:
|
||
default:
|
||
as_bad (_("bad relocation type: 0x%02x"), fixP->fx_r_type);
|
||
break;
|
||
}
|
||
|
||
if (fixP->fx_addsy == (symbolS *) NULL)
|
||
fixP->fx_done = 1;
|
||
}
|
||
|
||
/* Should never be called for or32. */
|
||
|
||
void
|
||
md_create_short_jump (char * ptr ATTRIBUTE_UNUSED,
|
||
addressT from_addr ATTRIBUTE_UNUSED,
|
||
addressT to_addr ATTRIBUTE_UNUSED,
|
||
fragS * frag ATTRIBUTE_UNUSED,
|
||
symbolS * to_symbol ATTRIBUTE_UNUSED)
|
||
{
|
||
as_fatal ("or32_create_short_jmp\n");
|
||
}
|
||
|
||
/* Should never be called for or32. */
|
||
|
||
void
|
||
md_convert_frag (bfd * headers ATTRIBUTE_UNUSED,
|
||
segT seg ATTRIBUTE_UNUSED,
|
||
fragS * fragP ATTRIBUTE_UNUSED)
|
||
{
|
||
as_fatal ("or32_convert_frag\n");
|
||
}
|
||
|
||
/* Should never be called for or32. */
|
||
|
||
void
|
||
md_create_long_jump (char * ptr ATTRIBUTE_UNUSED,
|
||
addressT from_addr ATTRIBUTE_UNUSED,
|
||
addressT to_addr ATTRIBUTE_UNUSED,
|
||
fragS * frag ATTRIBUTE_UNUSED,
|
||
symbolS * to_symbol ATTRIBUTE_UNUSED)
|
||
{
|
||
as_fatal ("or32_create_long_jump\n");
|
||
}
|
||
|
||
/* Should never be called for or32. */
|
||
|
||
int
|
||
md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED,
|
||
segT segtype ATTRIBUTE_UNUSED)
|
||
{
|
||
as_fatal ("or32_estimate_size_before_relax\n");
|
||
return 0;
|
||
}
|
||
|
||
/* Translate internal representation of relocation info to target format.
|
||
|
||
On sparc/29k: first 4 bytes are normal unsigned long address, next three
|
||
bytes are index, most sig. byte first. Byte 7 is broken up with
|
||
bit 7 as external, bits 6 & 5 unused, and the lower
|
||
five bits as relocation type. Next 4 bytes are long addend. */
|
||
/* Thanx and a tip of the hat to Michael Bloom, mb@ttidca.tti.com. */
|
||
|
||
#ifdef OBJ_AOUT
|
||
void
|
||
tc_aout_fix_to_chars (char *where,
|
||
fixS *fixP,
|
||
relax_addressT segment_address_in_file)
|
||
{
|
||
long r_symbolnum;
|
||
|
||
#if DEBUG
|
||
printf ("tc_aout_fix_to_chars\n");
|
||
#endif
|
||
|
||
know (fixP->fx_r_type < BFD_RELOC_NONE);
|
||
know (fixP->fx_addsy != NULL);
|
||
|
||
md_number_to_chars
|
||
(where,
|
||
fixP->fx_frag->fr_address + fixP->fx_where - segment_address_in_file,
|
||
4);
|
||
|
||
r_symbolnum = (S_IS_DEFINED (fixP->fx_addsy)
|
||
? S_GET_TYPE (fixP->fx_addsy)
|
||
: fixP->fx_addsy->sy_number);
|
||
|
||
where[4] = (r_symbolnum >> 16) & 0x0ff;
|
||
where[5] = (r_symbolnum >> 8) & 0x0ff;
|
||
where[6] = r_symbolnum & 0x0ff;
|
||
where[7] = (((!S_IS_DEFINED (fixP->fx_addsy)) << 7) & 0x80) | (0 & 0x60) | (fixP->fx_r_type & 0x1F);
|
||
|
||
/* Also easy. */
|
||
md_number_to_chars (&where[8], fixP->fx_addnumber, 4);
|
||
}
|
||
|
||
#endif /* OBJ_AOUT */
|
||
|
||
const char *md_shortopts = "";
|
||
|
||
struct option md_longopts[] =
|
||
{
|
||
{ NULL, no_argument, NULL, 0 }
|
||
};
|
||
size_t md_longopts_size = sizeof (md_longopts);
|
||
|
||
int
|
||
md_parse_option (int c ATTRIBUTE_UNUSED, char * arg ATTRIBUTE_UNUSED)
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
void
|
||
md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
|
||
{
|
||
}
|
||
|
||
/* This is called when a line is unrecognized. This is used to handle
|
||
definitions of or32 style local labels. */
|
||
|
||
int
|
||
or32_unrecognized_line (int c)
|
||
{
|
||
int lab;
|
||
char *s;
|
||
|
||
if (c != '$'
|
||
|| ! ISDIGIT ((unsigned char) input_line_pointer[0]))
|
||
return 0;
|
||
|
||
s = input_line_pointer;
|
||
|
||
lab = 0;
|
||
while (ISDIGIT ((unsigned char) *s))
|
||
{
|
||
lab = lab * 10 + *s - '0';
|
||
++s;
|
||
}
|
||
|
||
if (*s != ':')
|
||
/* Not a label definition. */
|
||
return 0;
|
||
|
||
if (dollar_label_defined (lab))
|
||
{
|
||
as_bad (_("label \"$%d\" redefined"), lab);
|
||
return 0;
|
||
}
|
||
|
||
define_dollar_label (lab);
|
||
colon (dollar_label_name (lab, 0));
|
||
input_line_pointer = s + 1;
|
||
|
||
return 1;
|
||
}
|
||
|
||
/* Default the values of symbols known that should be "predefined". We
|
||
don't bother to predefine them unless you actually use one, since there
|
||
are a lot of them. */
|
||
|
||
symbolS *
|
||
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
|
||
{
|
||
return NULL;
|
||
}
|
||
|
||
/* Parse an operand that is machine-specific. */
|
||
|
||
void
|
||
md_operand (expressionS *expressionP)
|
||
{
|
||
#if DEBUG
|
||
printf (" md_operand(input_line_pointer = %s)\n", input_line_pointer);
|
||
#endif
|
||
|
||
if (input_line_pointer[0] == REGISTER_PREFIX && input_line_pointer[1] == 'r')
|
||
{
|
||
/* We have a numeric register expression. No biggy. */
|
||
input_line_pointer += 2; /* Skip %r */
|
||
(void) expression (expressionP);
|
||
|
||
if (expressionP->X_op != O_constant
|
||
|| expressionP->X_add_number > 255)
|
||
as_bad (_("Invalid expression after %%%%\n"));
|
||
expressionP->X_op = O_register;
|
||
}
|
||
else if (input_line_pointer[0] == '&')
|
||
{
|
||
/* We are taking the 'address' of a register...this one is not
|
||
in the manual, but it *is* in traps/fpsymbol.h! What they
|
||
seem to want is the register number, as an absolute number. */
|
||
input_line_pointer++; /* Skip & */
|
||
(void) expression (expressionP);
|
||
|
||
if (expressionP->X_op != O_register)
|
||
as_bad (_("invalid register in & expression"));
|
||
else
|
||
expressionP->X_op = O_constant;
|
||
}
|
||
else if (input_line_pointer[0] == '$'
|
||
&& ISDIGIT ((unsigned char) input_line_pointer[1]))
|
||
{
|
||
long lab;
|
||
char *name;
|
||
symbolS *sym;
|
||
|
||
/* This is a local label. */
|
||
++input_line_pointer;
|
||
lab = (long) get_absolute_expression ();
|
||
|
||
if (dollar_label_defined (lab))
|
||
{
|
||
name = dollar_label_name (lab, 0);
|
||
sym = symbol_find (name);
|
||
}
|
||
else
|
||
{
|
||
name = dollar_label_name (lab, 1);
|
||
sym = symbol_find_or_make (name);
|
||
}
|
||
|
||
expressionP->X_op = O_symbol;
|
||
expressionP->X_add_symbol = sym;
|
||
expressionP->X_add_number = 0;
|
||
}
|
||
else if (input_line_pointer[0] == '$')
|
||
{
|
||
char *s;
|
||
char type;
|
||
int fieldnum, fieldlimit;
|
||
LITTLENUM_TYPE floatbuf[8];
|
||
|
||
/* $float(), $doubleN(), or $extendN() convert floating values
|
||
to integers. */
|
||
s = input_line_pointer;
|
||
|
||
++s;
|
||
|
||
fieldnum = 0;
|
||
if (strncmp (s, "double", sizeof "double" - 1) == 0)
|
||
{
|
||
s += sizeof "double" - 1;
|
||
type = 'd';
|
||
fieldlimit = 2;
|
||
}
|
||
else if (strncmp (s, "float", sizeof "float" - 1) == 0)
|
||
{
|
||
s += sizeof "float" - 1;
|
||
type = 'f';
|
||
fieldlimit = 1;
|
||
}
|
||
else if (strncmp (s, "extend", sizeof "extend" - 1) == 0)
|
||
{
|
||
s += sizeof "extend" - 1;
|
||
type = 'x';
|
||
fieldlimit = 4;
|
||
}
|
||
else
|
||
return;
|
||
|
||
if (ISDIGIT (*s))
|
||
{
|
||
fieldnum = *s - '0';
|
||
++s;
|
||
}
|
||
if (fieldnum >= fieldlimit)
|
||
return;
|
||
|
||
SKIP_WHITESPACE ();
|
||
if (*s != '(')
|
||
return;
|
||
++s;
|
||
SKIP_WHITESPACE ();
|
||
|
||
s = atof_ieee (s, type, floatbuf);
|
||
if (s == NULL)
|
||
return;
|
||
s = s;
|
||
|
||
SKIP_WHITESPACE ();
|
||
if (*s != ')')
|
||
return;
|
||
++s;
|
||
SKIP_WHITESPACE ();
|
||
|
||
input_line_pointer = s;
|
||
expressionP->X_op = O_constant;
|
||
expressionP->X_unsigned = 1;
|
||
expressionP->X_add_number = ((floatbuf[fieldnum * 2]
|
||
<< LITTLENUM_NUMBER_OF_BITS)
|
||
+ floatbuf[fieldnum * 2 + 1]);
|
||
}
|
||
}
|
||
|
||
/* Round up a section size to the appropriate boundary. */
|
||
|
||
valueT
|
||
md_section_align (segT segment ATTRIBUTE_UNUSED, valueT size ATTRIBUTE_UNUSED)
|
||
{
|
||
return size; /* Byte alignment is fine. */
|
||
}
|
||
|
||
/* Exactly what point is a PC-relative offset relative TO?
|
||
On the 29000, they're relative to the address of the instruction,
|
||
which we have set up as the address of the fixup too. */
|
||
|
||
long
|
||
md_pcrel_from (fixS *fixP)
|
||
{
|
||
return fixP->fx_where + fixP->fx_frag->fr_address;
|
||
}
|
||
|
||
/* Generate a reloc for a fixup. */
|
||
|
||
arelent *
|
||
tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED, fixS *fixp)
|
||
{
|
||
arelent *reloc;
|
||
|
||
reloc = xmalloc (sizeof (arelent));
|
||
reloc->sym_ptr_ptr = xmalloc (sizeof (asymbol *));
|
||
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
|
||
reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
|
||
/* reloc->address = fixp->fx_frag->fr_address + fixp->fx_where + fixp->fx_addnumber;*/
|
||
reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
|
||
|
||
if (reloc->howto == (reloc_howto_type *) NULL)
|
||
{
|
||
as_bad_where (fixp->fx_file, fixp->fx_line,
|
||
_("reloc %d not supported by object file format"),
|
||
(int) fixp->fx_r_type);
|
||
return NULL;
|
||
}
|
||
|
||
if (fixp->fx_r_type == BFD_RELOC_VTABLE_ENTRY)
|
||
reloc->address = fixp->fx_offset;
|
||
|
||
reloc->addend = fixp->fx_addnumber;
|
||
return reloc;
|
||
}
|