644 lines
14 KiB
C
644 lines
14 KiB
C
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/* tc-v850.c -- Assembler code for the NEC V850
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Copyright (C) 1996 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 "opcode/v850.h"
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/* Generic assembler global variables which must be defined by all targets. */
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/* Characters which always start a comment. */
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const char comment_chars[] = "#";
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/* Characters which start a comment at the beginning of a line. */
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const char line_comment_chars[] = "#";
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/* Characters which may be used to separate multiple commands on a
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single line. */
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const char line_separator_chars[] = ";";
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/* Characters which are used to indicate an exponent in a floating
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point number. */
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const char EXP_CHARS[] = "eE";
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/* Characters which mean that a number is a floating point constant,
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as in 0d1.0. */
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const char FLT_CHARS[] = "dD";
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/* local functions */
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static unsigned long v850_insert_operand
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PARAMS ((unsigned long insn, const struct v850_operand *operand,
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offsetT val, char *file, unsigned int line));
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static int reg_name_search PARAMS ((char *name));
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static boolean register_name PARAMS ((expressionS *expressionP));
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static int postfix PARAMS ((char *p));
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static bfd_reloc_code_real_type get_reloc PARAMS ((struct v850_operand *op));
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static unsigned long build_insn PARAMS ((struct v850_opcode *opcode, expressionS *opers));
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/* fixups */
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#define MAX_INSN_FIXUPS (5)
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struct v850_fixup
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{
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expressionS exp;
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int opindex;
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bfd_reloc_code_real_type reloc;
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};
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struct v850_fixup fixups[MAX_INSN_FIXUPS];
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static int fc;
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const char *md_shortopts = "";
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struct option md_longopts[] = {
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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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/* 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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/*
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{ "byte", ppc_byte, 0 },
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{ "long", ppc_elf_cons, 4 },
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{ "word", ppc_elf_cons, 2 },
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{ "short", ppc_elf_cons, 2 },
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{ "rdata", ppc_elf_rdata, 0 },
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{ "rodata", ppc_elf_rdata, 0 },
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{ "lcomm", ppc_elf_lcomm, 0 },
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*/
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{ NULL, NULL, 0 }
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};
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/* Opcode hash table. */
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static struct hash_control *v850_hash;
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/* Structure to hold information about predefined registers. */
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struct pd_reg
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{
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char *name;
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int value;
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};
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/* an expressionS only has one register type, so we fake it */
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/* by setting high bits to indicate type */
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#define REGISTER_MASK 0xFF
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/* The table is sorted. Suitable for searching by a binary search. */
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static const struct pd_reg pre_defined_registers[] =
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{
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{ "ep", 30 }, /* ep - element ptr */
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{ "gp", 4 }, /* gp - global ptr */
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{ "lp", 31 }, /* lp - link ptr */
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{ "r0", 0 },
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{ "r1", 1 },
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{ "r10", 10 },
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{ "r11", 11 },
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{ "r12", 12 },
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{ "r13", 13 },
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{ "r14", 14 },
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{ "r15", 15 },
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{ "r16", 16 },
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{ "r17", 17 },
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{ "r18", 18 },
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{ "r19", 19 },
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{ "r2", 2 },
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{ "r20", 20 },
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{ "r21", 21 },
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{ "r22", 22 },
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{ "r23", 23 },
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{ "r24", 24 },
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{ "r25", 25 },
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{ "r26", 26 },
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{ "r27", 27 },
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{ "r28", 28 },
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{ "r29", 29 },
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{ "r3", 3 },
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{ "r30", 30 },
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{ "r31", 31 },
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{ "r4", 4 },
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{ "r5", 5 },
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{ "r6", 6 },
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{ "r7", 7 },
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{ "r8", 8 },
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{ "r9", 9 },
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{ "sp", 3 }, /* sp - stack ptr */
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{ "tp", 5 }, /* tp - text ptr */
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{ "zero", 0 },
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};
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#define REG_NAME_CNT (sizeof(pre_defined_registers) / sizeof(struct pd_reg))
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/* reg_name_search does a binary search of the pre_defined_registers
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array to see if "name" is a valid regiter name. Returns the register
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number from the array on success, or -1 on failure. */
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static int
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reg_name_search (name)
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char *name;
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{
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int middle, low, high;
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int cmp;
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low = 0;
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high = REG_NAME_CNT - 1;
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do
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{
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middle = (low + high) / 2;
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cmp = strcasecmp (name, pre_defined_registers[middle].name);
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if (cmp < 0)
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high = middle - 1;
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else if (cmp > 0)
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low = middle + 1;
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else
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return pre_defined_registers[middle].value;
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}
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while (low <= high);
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return -1;
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}
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/* Summary of register_name().
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*
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* in: Input_line_pointer points to 1st char of operand.
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*
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* out: A expressionS.
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* The operand may have been a register: in this case, X_op == O_register,
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* X_add_number is set to the register number, and truth is returned.
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* Input_line_pointer->(next non-blank) char after operand, or is in
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* its original state.
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*/
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static boolean
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register_name (expressionP)
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expressionS *expressionP;
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{
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int reg_number;
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char *name;
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char *start;
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char c;
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/* Find the spelling of the operand */
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start = name = input_line_pointer;
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c = get_symbol_end ();
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reg_number = reg_name_search (name);
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/* look to see if it's in the register table */
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if (reg_number >= 0)
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{
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expressionP->X_op = O_register;
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expressionP->X_add_number = reg_number;
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/* make the rest nice */
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expressionP->X_add_symbol = NULL;
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expressionP->X_op_symbol = NULL;
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*input_line_pointer = c; /* put back the delimiting char */
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return true;
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}
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else
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{
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/* reset the line as if we had not done anything */
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*input_line_pointer = c; /* put back the delimiting char */
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input_line_pointer = start; /* reset input_line pointer */
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return false;
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}
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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, "V850 options:\n\
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none yet\n");
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}
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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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return 0;
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}
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symbolS *
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md_undefined_symbol (name)
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char *name;
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{
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return 0;
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}
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char *
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md_atof (type, litp, sizep)
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int type;
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char *litp;
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int *sizep;
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{
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int prec;
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LITTLENUM_TYPE words[4];
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char *t;
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int i;
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switch (type)
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{
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case 'f':
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prec = 2;
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break;
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case 'd':
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prec = 4;
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break;
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default:
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*sizep = 0;
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return "bad call to md_atof";
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}
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t = atof_ieee (input_line_pointer, type, words);
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if (t)
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input_line_pointer = t;
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*sizep = prec * 2;
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for (i = prec - 1; i >= 0; i--)
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{
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md_number_to_chars (litp, (valueT) words[i], 2);
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litp += 2;
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}
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return NULL;
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}
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void
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md_convert_frag (abfd, sec, fragP)
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bfd *abfd;
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asection *sec;
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fragS *fragP;
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{
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/* printf ("call to md_convert_frag \n"); */
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abort ();
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}
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valueT
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md_section_align (seg, addr)
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asection *seg;
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valueT addr;
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{
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int align = bfd_get_section_alignment (stdoutput, seg);
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return ((addr + (1 << align) - 1) & (-1 << align));
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}
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void
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md_begin ()
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{
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char *prev_name = "";
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register const struct v850_opcode *op;
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const struct v850_opcode *op_end;
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v850_hash = hash_new();
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/* Insert unique names into hash table. The V850 instruction set
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has many identical opcode names that have different opcodes based
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on the operands. This hash table then provides a quick index to
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the first opcode with a particular name in the opcode table. */
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op = v850_opcodes;
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op_end = v850_opcodes + v850_num_opcodes;
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for (; op < op_end; op++)
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{
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if (strcmp (prev_name, op->name))
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{
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prev_name = (char *) op->name;
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hash_insert (v850_hash, op->name, (char *) op);
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}
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}
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}
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static bfd_reloc_code_real_type
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get_reloc (op)
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struct v850_operand *op;
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{
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abort ();
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}
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/* get_operands parses a string of operands and returns and array of
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expressions. */
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static int
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get_operands (exp)
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expressionS exp[];
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{
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char *p = input_line_pointer;
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int numops = 0;
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while (*p)
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{
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while (*p == ' ' || *p == '\t' || *p == ',')
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p++;
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if (*p==0 || *p=='\n' || *p=='\r')
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break;
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input_line_pointer = p;
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if (!register_name(&exp[numops]))
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expression(&exp[numops]);
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numops++;
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p = input_line_pointer;
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}
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exp[numops].X_op = 0;
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return (numops);
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}
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void
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md_assemble (str)
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char *str;
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{
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char *s;
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struct v850_opcode *opcode;
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struct v850_opcode *next_opcode;
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const unsigned char *opindex_ptr;
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int next_opindex;
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unsigned long insn;
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char *f;
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int i;
|
|||
|
|
int numops;
|
|||
|
|
int match;
|
|||
|
|
|
|||
|
|
int numopts;
|
|||
|
|
expressionS myops[5];
|
|||
|
|
|
|||
|
|
/* Get the opcode. */
|
|||
|
|
for (s = str; *s != '\0' && ! isspace (*s); s++)
|
|||
|
|
;
|
|||
|
|
if (*s != '\0')
|
|||
|
|
*s++ = '\0';
|
|||
|
|
|
|||
|
|
/* find the first opcode with the proper name */
|
|||
|
|
opcode = (struct v850_opcode *)hash_find (v850_hash, str);
|
|||
|
|
if (opcode == NULL)
|
|||
|
|
{
|
|||
|
|
as_bad ("Unrecognized opcode: `%s'", str);
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
str = s;
|
|||
|
|
while (isspace (*str))
|
|||
|
|
++str;
|
|||
|
|
|
|||
|
|
input_line_pointer = str;
|
|||
|
|
|
|||
|
|
/* get all the operands and save them as expressions */
|
|||
|
|
numops = get_operands (myops);
|
|||
|
|
|
|||
|
|
/* now search the opcode table for one with operands that matches
|
|||
|
|
what we've got */
|
|||
|
|
match = 0;
|
|||
|
|
while (!match)
|
|||
|
|
{
|
|||
|
|
match = 1;
|
|||
|
|
for (i = 0; opcode->operands[i]; i++)
|
|||
|
|
{
|
|||
|
|
int flags = v850_operands[opcode->operands[i]].flags;
|
|||
|
|
int X_op = myops[i].X_op;
|
|||
|
|
int num = myops[i].X_add_number;
|
|||
|
|
|
|||
|
|
if (X_op == 0)
|
|||
|
|
{
|
|||
|
|
match = 0;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (flags & OPERAND_REG)
|
|||
|
|
{
|
|||
|
|
if (X_op != O_register)
|
|||
|
|
{
|
|||
|
|
match = 0;
|
|||
|
|
break;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* we're only done if the operands matched so far AND there are
|
|||
|
|
no more to check. */
|
|||
|
|
if (match && myops[i].X_op == 0)
|
|||
|
|
break;
|
|||
|
|
|
|||
|
|
next_opcode = opcode + 1;
|
|||
|
|
if (next_opcode->opcode == 0)
|
|||
|
|
break;
|
|||
|
|
if (strcmp (next_opcode->name, opcode->name))
|
|||
|
|
break;
|
|||
|
|
opcode = next_opcode;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
if (!match)
|
|||
|
|
{
|
|||
|
|
as_bad ("Unrecognized operands");
|
|||
|
|
return;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
insn = opcode->opcode;
|
|||
|
|
|
|||
|
|
#if 0
|
|||
|
|
while (isspace (*str))
|
|||
|
|
++str;
|
|||
|
|
|
|||
|
|
if (*str != '\0')
|
|||
|
|
as_bad ("junk at end of line: `%s'", str);
|
|||
|
|
#endif
|
|||
|
|
|
|||
|
|
/* Write out the instruction. */
|
|||
|
|
f = frag_more (2);
|
|||
|
|
md_number_to_chars (f, insn, 2);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
/* if while processing a fixup, a reloc really needs to be created */
|
|||
|
|
/* then it is done here */
|
|||
|
|
|
|||
|
|
arelent *
|
|||
|
|
tc_gen_reloc (seg, fixp)
|
|||
|
|
asection *seg;
|
|||
|
|
fixS *fixp;
|
|||
|
|
{
|
|||
|
|
arelent *reloc;
|
|||
|
|
reloc = (arelent *) bfd_alloc_by_size_t (stdoutput, sizeof (arelent));
|
|||
|
|
reloc->sym_ptr_ptr = &fixp->fx_addsy->bsym;
|
|||
|
|
reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
|
|||
|
|
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;
|
|||
|
|
}
|
|||
|
|
reloc->addend = fixp->fx_addnumber;
|
|||
|
|
/* printf("tc_gen_reloc: addr=%x addend=%x\n", reloc->address, reloc->addend); */
|
|||
|
|
return reloc;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
int
|
|||
|
|
md_estimate_size_before_relax (fragp, seg)
|
|||
|
|
fragS *fragp;
|
|||
|
|
asection *seg;
|
|||
|
|
{
|
|||
|
|
abort ();
|
|||
|
|
return 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
long
|
|||
|
|
md_pcrel_from_section (fixp, sec)
|
|||
|
|
fixS *fixp;
|
|||
|
|
segT sec;
|
|||
|
|
{
|
|||
|
|
return 0;
|
|||
|
|
/* return fixp->fx_frag->fr_address + fixp->fx_where; */
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
int
|
|||
|
|
md_apply_fix3 (fixp, valuep, seg)
|
|||
|
|
fixS *fixp;
|
|||
|
|
valueT *valuep;
|
|||
|
|
segT seg;
|
|||
|
|
{
|
|||
|
|
abort();
|
|||
|
|
#if 0
|
|||
|
|
valueT value;
|
|||
|
|
char *where;
|
|||
|
|
unsigned long insn;
|
|||
|
|
int op_type;
|
|||
|
|
|
|||
|
|
if (fixp->fx_addsy == (symbolS *) NULL)
|
|||
|
|
{
|
|||
|
|
value = *valuep;
|
|||
|
|
fixp->fx_done = 1;
|
|||
|
|
}
|
|||
|
|
else if (fixp->fx_pcrel)
|
|||
|
|
value = *valuep;
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
value = fixp->fx_offset;
|
|||
|
|
if (fixp->fx_subsy != (symbolS *) NULL)
|
|||
|
|
{
|
|||
|
|
if (S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
|
|||
|
|
value -= S_GET_VALUE (fixp->fx_subsy);
|
|||
|
|
else
|
|||
|
|
{
|
|||
|
|
/* We don't actually support subtracting a symbol. */
|
|||
|
|
as_bad_where (fixp->fx_file, fixp->fx_line,
|
|||
|
|
"expression too complex");
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/* printf("md_apply_fix: value=0x%x type=%d\n", value, fixp->fx_r_type); */
|
|||
|
|
|
|||
|
|
op_type = fixp->fx_r_type;
|
|||
|
|
fixp->fx_r_type = get_reloc((struct v850_operand *)&v850_operands[op_type]);
|
|||
|
|
|
|||
|
|
/* printf("reloc=%d\n",fixp->fx_r_type); */
|
|||
|
|
|
|||
|
|
/* Fetch the instruction, insert the fully resolved operand
|
|||
|
|
value, and stuff the instruction back again. */
|
|||
|
|
where = fixp->fx_frag->fr_literal + fixp->fx_where;
|
|||
|
|
insn = bfd_getb32 ((unsigned char *) where);
|
|||
|
|
/* printf(" insn=%x value=%x\n",insn,value); */
|
|||
|
|
|
|||
|
|
insn = v850_insert_operand (insn, op_type, (offsetT) value);
|
|||
|
|
|
|||
|
|
/* printf(" new insn=%x\n",insn); */
|
|||
|
|
|
|||
|
|
bfd_putb32 ((bfd_vma) insn, (unsigned char *) where);
|
|||
|
|
|
|||
|
|
if (fixp->fx_done)
|
|||
|
|
return 1;
|
|||
|
|
|
|||
|
|
fixp->fx_addnumber = value;
|
|||
|
|
return 1;
|
|||
|
|
#endif
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
|
|||
|
|
/* Insert an operand value into an instruction. */
|
|||
|
|
|
|||
|
|
static unsigned long
|
|||
|
|
v850_insert_operand (insn, operand, val, file, line)
|
|||
|
|
unsigned long insn;
|
|||
|
|
const struct v850_operand *operand;
|
|||
|
|
offsetT val;
|
|||
|
|
char *file;
|
|||
|
|
unsigned int line;
|
|||
|
|
{
|
|||
|
|
if (operand->bits != 32)
|
|||
|
|
{
|
|||
|
|
long min, max;
|
|||
|
|
offsetT test;
|
|||
|
|
|
|||
|
|
#if 0
|
|||
|
|
if ((operand->flags & PPC_OPERAND_SIGNED) != 0)
|
|||
|
|
{
|
|||
|
|
if ((operand->flags & PPC_OPERAND_SIGNOPT) != 0
|
|||
|
|
&& ppc_size == PPC_OPCODE_32)
|
|||
|
|
max = (1 << operand->bits) - 1;
|
|||
|
|
else
|
|||
|
|
max = (1 << (operand->bits - 1)) - 1;
|
|||
|
|
min = - (1 << (operand->bits - 1));
|
|||
|
|
}
|
|||
|
|
else
|
|||
|
|
#endif
|
|||
|
|
{
|
|||
|
|
max = (1 << operand->bits) - 1;
|
|||
|
|
min = 0;
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#if 0
|
|||
|
|
if ((operand->flags & PPC_OPERAND_NEGATIVE) != 0)
|
|||
|
|
test = - val;
|
|||
|
|
else
|
|||
|
|
#endif
|
|||
|
|
test = val;
|
|||
|
|
|
|||
|
|
|
|||
|
|
if (test < (offsetT) min || test > (offsetT) max)
|
|||
|
|
{
|
|||
|
|
const char *err =
|
|||
|
|
"operand out of range (%s not between %ld and %ld)";
|
|||
|
|
char buf[100];
|
|||
|
|
|
|||
|
|
sprint_value (buf, test);
|
|||
|
|
if (file == (char *) NULL)
|
|||
|
|
as_warn (err, buf, min, max);
|
|||
|
|
else
|
|||
|
|
as_warn_where (file, line, err, buf, min, max);
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
insn |= (((long) val & ((1 << operand->bits) - 1)) << operand->shift);
|
|||
|
|
return insn;
|
|||
|
|
}
|