817 lines
18 KiB
C
817 lines
18 KiB
C
/* tc-rl78.c -- Assembler for the Renesas RL78
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Copyright 2011
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Free Software Foundation, Inc.
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This file is part of GAS, the GNU Assembler.
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GAS is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3, or (at your option)
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any later version.
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GAS is distributed in the hope that it will be useful,
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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 the Free
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Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "as.h"
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#include "struc-symbol.h"
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#include "obstack.h"
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#include "safe-ctype.h"
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#include "dwarf2dbg.h"
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#include "libbfd.h"
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#include "elf/common.h"
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#include "elf/rl78.h"
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#include "rl78-defs.h"
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#include "filenames.h"
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#include "listing.h"
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#include "sb.h"
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#include "macro.h"
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const char comment_chars[] = ";";
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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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const char line_comment_chars[] = "#";
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/* Use something that isn't going to be needed by any expressions or
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other syntax. */
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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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/*------------------------------------------------------------------*/
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char * rl78_lex_start;
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char * rl78_lex_end;
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typedef struct rl78_bytesT
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{
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char prefix[1];
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int n_prefix;
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char base[4];
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int n_base;
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char ops[8];
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int n_ops;
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struct
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{
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expressionS exp;
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char offset;
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char nbits;
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char type; /* RL78REL_*. */
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int reloc;
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fixS * fixP;
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} fixups[2];
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int n_fixups;
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struct
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{
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char type;
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char field_pos;
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char val_ofs;
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} relax[2];
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int n_relax;
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int link_relax;
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fixS *link_relax_fixP;
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char times_grown;
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char times_shrank;
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} rl78_bytesT;
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static rl78_bytesT rl78_bytes;
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void
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rl78_linkrelax_addr16 (void)
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{
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rl78_bytes.link_relax |= RL78_RELAXA_ADDR16;
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}
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void
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rl78_linkrelax_branch (void)
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{
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rl78_bytes.link_relax |= RL78_RELAXA_BRA;
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}
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static void
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rl78_fixup (expressionS exp, int offsetbits, int nbits, int type)
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{
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rl78_bytes.fixups[rl78_bytes.n_fixups].exp = exp;
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rl78_bytes.fixups[rl78_bytes.n_fixups].offset = offsetbits;
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rl78_bytes.fixups[rl78_bytes.n_fixups].nbits = nbits;
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rl78_bytes.fixups[rl78_bytes.n_fixups].type = type;
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rl78_bytes.fixups[rl78_bytes.n_fixups].reloc = exp.X_md;
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rl78_bytes.n_fixups ++;
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}
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#define rl78_field_fixup(exp, offset, nbits, type) \
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rl78_fixup (exp, offset + 8 * rl78_bytes.n_prefix), nbits, type)
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#define rl78_op_fixup(exp, offset, nbits, type) \
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rl78_fixup (exp, offset + 8 * (rl78_bytes.n_prefix + rl78_bytes.n_base), nbits, type)
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void
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rl78_prefix (int p)
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{
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rl78_bytes.prefix[0] = p;
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rl78_bytes.n_prefix = 1;
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}
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int
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rl78_has_prefix ()
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{
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return rl78_bytes.n_prefix;
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}
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void
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rl78_base1 (int b1)
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{
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rl78_bytes.base[0] = b1;
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rl78_bytes.n_base = 1;
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}
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void
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rl78_base2 (int b1, int b2)
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{
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rl78_bytes.base[0] = b1;
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rl78_bytes.base[1] = b2;
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rl78_bytes.n_base = 2;
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}
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void
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rl78_base3 (int b1, int b2, int b3)
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{
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rl78_bytes.base[0] = b1;
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rl78_bytes.base[1] = b2;
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rl78_bytes.base[2] = b3;
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rl78_bytes.n_base = 3;
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}
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void
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rl78_base4 (int b1, int b2, int b3, int b4)
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{
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rl78_bytes.base[0] = b1;
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rl78_bytes.base[1] = b2;
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rl78_bytes.base[2] = b3;
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rl78_bytes.base[3] = b4;
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rl78_bytes.n_base = 4;
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}
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#define F_PRECISION 2
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void
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rl78_op (expressionS exp, int nbytes, int type)
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{
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int v = 0;
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if ((exp.X_op == O_constant || exp.X_op == O_big)
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&& type != RL78REL_PCREL)
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{
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if (exp.X_op == O_big && exp.X_add_number <= 0)
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{
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LITTLENUM_TYPE w[2];
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char * ip = rl78_bytes.ops + rl78_bytes.n_ops;
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gen_to_words (w, F_PRECISION, 8);
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ip[3] = w[0] >> 8;
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ip[2] = w[0];
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ip[1] = w[1] >> 8;
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ip[0] = w[1];
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rl78_bytes.n_ops += 4;
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}
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else
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{
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v = exp.X_add_number;
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while (nbytes)
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{
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rl78_bytes.ops[rl78_bytes.n_ops++] =v & 0xff;
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v >>= 8;
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nbytes --;
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}
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}
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}
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else
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{
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rl78_op_fixup (exp, rl78_bytes.n_ops * 8, nbytes * 8, type);
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memset (rl78_bytes.ops + rl78_bytes.n_ops, 0, nbytes);
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rl78_bytes.n_ops += nbytes;
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}
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}
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/* This gets complicated when the field spans bytes, because fields
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are numbered from the MSB of the first byte as zero, and bits are
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stored LSB towards the LSB of the byte. Thus, a simple four-bit
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insertion of 12 at position 4 of 0x00 yields: 0x0b. A three-bit
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insertion of b'MXL at position 7 is like this:
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- - - - - - - - - - - - - - - -
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M X L */
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void
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rl78_field (int val, int pos, int sz)
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{
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int valm;
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int bytep, bitp;
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if (sz > 0)
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{
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if (val < 0 || val >= (1 << sz))
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as_bad (_("Value %d doesn't fit in unsigned %d-bit field"), val, sz);
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}
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else
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{
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sz = - sz;
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if (val < -(1 << (sz - 1)) || val >= (1 << (sz - 1)))
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as_bad (_("Value %d doesn't fit in signed %d-bit field"), val, sz);
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}
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/* This code points at 'M' in the above example. */
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bytep = pos / 8;
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bitp = pos % 8;
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while (bitp + sz > 8)
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{
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int ssz = 8 - bitp;
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int svalm;
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svalm = val >> (sz - ssz);
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svalm = svalm & ((1 << ssz) - 1);
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svalm = svalm << (8 - bitp - ssz);
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gas_assert (bytep < rl78_bytes.n_base);
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rl78_bytes.base[bytep] |= svalm;
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bitp = 0;
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sz -= ssz;
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bytep ++;
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}
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valm = val & ((1 << sz) - 1);
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valm = valm << (8 - bitp - sz);
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gas_assert (bytep < rl78_bytes.n_base);
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rl78_bytes.base[bytep] |= valm;
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}
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/*------------------------------------------------------------------*/
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enum options
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{
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OPTION_RELAX = OPTION_MD_BASE,
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};
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#define RL78_SHORTOPTS ""
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const char * md_shortopts = RL78_SHORTOPTS;
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/* Assembler options. */
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struct option md_longopts[] =
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{
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{"relax", no_argument, NULL, OPTION_RELAX},
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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 (int c, char * arg ATTRIBUTE_UNUSED)
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{
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switch (c)
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{
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case OPTION_RELAX:
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linkrelax = 1;
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return 1;
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}
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return 0;
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}
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void
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md_show_usage (FILE * stream ATTRIBUTE_UNUSED)
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{
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}
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static void
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s_bss (int ignore ATTRIBUTE_UNUSED)
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{
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int temp;
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temp = get_absolute_expression ();
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subseg_set (bss_section, (subsegT) temp);
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demand_empty_rest_of_line ();
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}
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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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/* Our "standard" pseudos. */
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{ "double", float_cons, 'd' },
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{ "bss", s_bss, 0 },
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{ "3byte", cons, 3 },
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{ "int", cons, 4 },
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{ "word", cons, 4 },
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/* End of list marker. */
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{ NULL, NULL, 0 }
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};
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void
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md_begin (void)
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{
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}
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void
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rl78_md_end (void)
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{
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}
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/* Write a value out to the object file, using the appropriate endianness. */
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void
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md_number_to_chars (char * buf, valueT val, int n)
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{
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number_to_chars_littleendian (buf, val, n);
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}
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static struct
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{
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char * fname;
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int reloc;
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}
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reloc_functions[] =
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{
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{ "lo16", BFD_RELOC_RL78_LO16 },
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{ "hi16", BFD_RELOC_RL78_HI16 },
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{ "hi8", BFD_RELOC_RL78_HI8 },
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{ 0, 0 }
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};
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void
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md_operand (expressionS * exp ATTRIBUTE_UNUSED)
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{
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int reloc = 0;
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int i;
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for (i = 0; reloc_functions[i].fname; i++)
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{
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int flen = strlen (reloc_functions[i].fname);
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if (input_line_pointer[0] == '%'
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&& strncasecmp (input_line_pointer + 1, reloc_functions[i].fname, flen) == 0
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&& input_line_pointer[flen + 1] == '(')
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{
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reloc = reloc_functions[i].reloc;
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input_line_pointer += flen + 2;
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break;
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}
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}
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if (reloc == 0)
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return;
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expression (exp);
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if (* input_line_pointer == ')')
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input_line_pointer ++;
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exp->X_md = reloc;
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}
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void
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rl78_frag_init (fragS * fragP)
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{
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if (rl78_bytes.n_relax || rl78_bytes.link_relax)
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{
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fragP->tc_frag_data = malloc (sizeof (rl78_bytesT));
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memcpy (fragP->tc_frag_data, & rl78_bytes, sizeof (rl78_bytesT));
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}
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else
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fragP->tc_frag_data = 0;
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}
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/* When relaxing, we need to output a reloc for any .align directive
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so that we can retain this alignment as we adjust opcode sizes. */
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void
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rl78_handle_align (fragS * frag)
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{
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if (linkrelax
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&& (frag->fr_type == rs_align
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|| frag->fr_type == rs_align_code)
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&& frag->fr_address + frag->fr_fix > 0
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&& frag->fr_offset > 0
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&& now_seg != bss_section)
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{
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fix_new (frag, frag->fr_fix, 0,
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&abs_symbol, RL78_RELAXA_ALIGN + frag->fr_offset,
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0, BFD_RELOC_RL78_RELAX);
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/* For the purposes of relaxation, this relocation is attached
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to the byte *after* the alignment - i.e. the byte that must
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remain aligned. */
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fix_new (frag->fr_next, 0, 0,
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&abs_symbol, RL78_RELAXA_ELIGN + frag->fr_offset,
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0, BFD_RELOC_RL78_RELAX);
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}
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}
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char *
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md_atof (int type, char * litP, int * sizeP)
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{
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return ieee_md_atof (type, litP, sizeP, target_big_endian);
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}
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symbolS *
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md_undefined_symbol (char * name ATTRIBUTE_UNUSED)
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{
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return NULL;
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}
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#define APPEND(B, N_B) \
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if (rl78_bytes.N_B) \
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{ \
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memcpy (bytes + idx, rl78_bytes.B, rl78_bytes.N_B); \
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idx += rl78_bytes.N_B; \
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}
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void
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md_assemble (char * str)
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{
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char * bytes;
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fragS * frag_then = frag_now;
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int idx = 0;
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int i;
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int rel;
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expressionS *exp;
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/*printf("\033[32mASM: %s\033[0m\n", str);*/
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dwarf2_emit_insn (0);
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memset (& rl78_bytes, 0, sizeof (rl78_bytes));
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rl78_lex_init (str, str + strlen (str));
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rl78_parse ();
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/* This simplifies the relaxation code. */
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if (rl78_bytes.link_relax)
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{
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int olen = rl78_bytes.n_prefix + rl78_bytes.n_base + rl78_bytes.n_ops;
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/* We do it this way because we want the frag to have the
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rl78_bytes in it, which we initialize above. */
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bytes = frag_more (olen);
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frag_then = frag_now;
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frag_variant (rs_machine_dependent,
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olen /* max_chars */,
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0 /* var */,
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olen /* subtype */,
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0 /* symbol */,
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0 /* offset */,
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0 /* opcode */);
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frag_then->fr_opcode = bytes;
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frag_then->fr_fix = olen + (bytes - frag_then->fr_literal);
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frag_then->fr_subtype = olen;
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frag_then->fr_var = 0;
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}
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else
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{
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bytes = frag_more (rl78_bytes.n_prefix + rl78_bytes.n_base + rl78_bytes.n_ops);
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frag_then = frag_now;
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}
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APPEND (prefix, n_prefix);
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APPEND (base, n_base);
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APPEND (ops, n_ops);
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if (rl78_bytes.link_relax)
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{
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fixS * f;
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f = fix_new (frag_then,
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(char *) bytes - frag_then->fr_literal,
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0,
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abs_section_sym,
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rl78_bytes.link_relax | rl78_bytes.n_fixups,
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0,
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BFD_RELOC_RL78_RELAX);
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frag_then->tc_frag_data->link_relax_fixP = f;
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}
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for (i = 0; i < rl78_bytes.n_fixups; i ++)
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{
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/* index: [nbytes][type] */
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static int reloc_map[5][4] =
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{
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{ 0, 0 },
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{ BFD_RELOC_8, BFD_RELOC_8_PCREL },
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{ BFD_RELOC_16, BFD_RELOC_16_PCREL },
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{ BFD_RELOC_24, BFD_RELOC_24_PCREL },
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{ BFD_RELOC_32, BFD_RELOC_32_PCREL },
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};
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fixS * f;
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idx = rl78_bytes.fixups[i].offset / 8;
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rel = reloc_map [rl78_bytes.fixups[i].nbits / 8][(int) rl78_bytes.fixups[i].type];
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if (rl78_bytes.fixups[i].reloc)
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rel = rl78_bytes.fixups[i].reloc;
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if (frag_then->tc_frag_data)
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exp = & frag_then->tc_frag_data->fixups[i].exp;
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else
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exp = & rl78_bytes.fixups[i].exp;
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f = fix_new_exp (frag_then,
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(char *) bytes + idx - frag_then->fr_literal,
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rl78_bytes.fixups[i].nbits / 8,
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exp,
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rl78_bytes.fixups[i].type == RL78REL_PCREL ? 1 : 0,
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rel);
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if (frag_then->tc_frag_data)
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frag_then->tc_frag_data->fixups[i].fixP = f;
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}
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}
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void
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rl78_cons_fix_new (fragS * frag,
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int where,
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int size,
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expressionS * exp)
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{
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bfd_reloc_code_real_type type;
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switch (size)
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|
{
|
|
case 1:
|
|
type = BFD_RELOC_8;
|
|
break;
|
|
case 2:
|
|
type = BFD_RELOC_16;
|
|
break;
|
|
case 3:
|
|
type = BFD_RELOC_24;
|
|
break;
|
|
case 4:
|
|
type = BFD_RELOC_32;
|
|
break;
|
|
default:
|
|
as_bad (_("unsupported constant size %d\n"), size);
|
|
return;
|
|
}
|
|
|
|
switch (exp->X_md)
|
|
{
|
|
case BFD_RELOC_RL78_LO16:
|
|
case BFD_RELOC_RL78_HI16:
|
|
if (size != 2)
|
|
as_bad (_("%%hi16/%%lo16 only applies to .short or .hword"));
|
|
type = exp->X_md;
|
|
break;
|
|
case BFD_RELOC_RL78_HI8:
|
|
if (size != 1)
|
|
as_bad (_("%%hi8 only applies to .byte"));
|
|
type = exp->X_md;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (exp->X_op == O_subtract && exp->X_op_symbol)
|
|
{
|
|
if (size != 4 && size != 2 && size != 1)
|
|
as_bad (_("difference of two symbols only supported with .long, .short, or .byte"));
|
|
else
|
|
type = BFD_RELOC_RL78_DIFF;
|
|
}
|
|
|
|
fix_new_exp (frag, where, (int) size, exp, 0, type);
|
|
}
|
|
|
|
/* No relaxation just yet */
|
|
int
|
|
md_estimate_size_before_relax (fragS * fragP ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
arelent **
|
|
tc_gen_reloc (asection * seg ATTRIBUTE_UNUSED, fixS * fixp)
|
|
{
|
|
static arelent * reloc[8];
|
|
int rp;
|
|
|
|
if (fixp->fx_r_type == BFD_RELOC_NONE)
|
|
{
|
|
reloc[0] = NULL;
|
|
return reloc;
|
|
}
|
|
|
|
if (fixp->fx_subsy
|
|
&& S_GET_SEGMENT (fixp->fx_subsy) == absolute_section)
|
|
{
|
|
fixp->fx_offset -= S_GET_VALUE (fixp->fx_subsy);
|
|
fixp->fx_subsy = NULL;
|
|
}
|
|
|
|
reloc[0] = (arelent *) xmalloc (sizeof (arelent));
|
|
reloc[0]->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *));
|
|
* reloc[0]->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
|
|
reloc[0]->address = fixp->fx_frag->fr_address + fixp->fx_where;
|
|
reloc[0]->addend = fixp->fx_offset;
|
|
|
|
if (fixp->fx_r_type == BFD_RELOC_RL78_32_OP
|
|
&& fixp->fx_subsy)
|
|
{
|
|
fixp->fx_r_type = BFD_RELOC_RL78_DIFF;
|
|
}
|
|
|
|
#define OPX(REL,SYM,ADD) \
|
|
reloc[rp] = (arelent *) xmalloc (sizeof (arelent)); \
|
|
reloc[rp]->sym_ptr_ptr = (asymbol **) xmalloc (sizeof (asymbol *)); \
|
|
reloc[rp]->howto = bfd_reloc_type_lookup (stdoutput, REL); \
|
|
reloc[rp]->addend = ADD; \
|
|
* reloc[rp]->sym_ptr_ptr = SYM; \
|
|
reloc[rp]->address = fixp->fx_frag->fr_address + fixp->fx_where; \
|
|
reloc[++rp] = NULL
|
|
#define OPSYM(SYM) OPX(BFD_RELOC_RL78_SYM, SYM, 0)
|
|
#define OPIMM(IMM) OPX(BFD_RELOC_RL78_SYM, abs_symbol.bsym, IMM)
|
|
#define OP(OP) OPX(BFD_RELOC_RL78_##OP, *reloc[0]->sym_ptr_ptr, 0)
|
|
#define SYM0() reloc[0]->howto = bfd_reloc_type_lookup (stdoutput, BFD_RELOC_RL78_SYM)
|
|
|
|
rp = 1;
|
|
|
|
/* Certain BFD relocations cannot be translated directly into
|
|
a single (non-Red Hat) RL78 relocation, but instead need
|
|
multiple RL78 relocations - handle them here. */
|
|
switch (fixp->fx_r_type)
|
|
{
|
|
case BFD_RELOC_RL78_DIFF:
|
|
SYM0 ();
|
|
OPSYM (symbol_get_bfdsym (fixp->fx_subsy));
|
|
OP(OP_SUBTRACT);
|
|
|
|
switch (fixp->fx_size)
|
|
{
|
|
case 1:
|
|
OP(ABS8);
|
|
break;
|
|
case 2:
|
|
OP (ABS16);
|
|
break;
|
|
case 4:
|
|
OP (ABS32);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case BFD_RELOC_RL78_NEG32:
|
|
SYM0 ();
|
|
OP (OP_NEG);
|
|
OP (ABS32);
|
|
break;
|
|
|
|
case BFD_RELOC_RL78_LO16:
|
|
SYM0 ();
|
|
OPIMM (0xffff);
|
|
OP (OP_AND);
|
|
OP (ABS16);
|
|
break;
|
|
|
|
case BFD_RELOC_RL78_HI16:
|
|
SYM0 ();
|
|
OPIMM (16);
|
|
OP (OP_SHRA);
|
|
OP (ABS16);
|
|
break;
|
|
|
|
case BFD_RELOC_RL78_HI8:
|
|
SYM0 ();
|
|
OPIMM (16);
|
|
OP (OP_SHRA);
|
|
OPIMM (0xff);
|
|
OP (OP_AND);
|
|
OP (ABS8);
|
|
break;
|
|
|
|
default:
|
|
reloc[0]->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
|
|
reloc[1] = NULL;
|
|
break;
|
|
}
|
|
|
|
return reloc;
|
|
}
|
|
|
|
int
|
|
rl78_validate_fix_sub (struct fix * f)
|
|
{
|
|
/* We permit the subtraction of two symbols in a few cases. */
|
|
/* mov #sym1-sym2, R3 */
|
|
if (f->fx_r_type == BFD_RELOC_RL78_32_OP)
|
|
return 1;
|
|
/* .long sym1-sym2 */
|
|
if (f->fx_r_type == BFD_RELOC_RL78_DIFF
|
|
&& ! f->fx_pcrel
|
|
&& (f->fx_size == 4 || f->fx_size == 2 || f->fx_size == 1))
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
long
|
|
md_pcrel_from_section (fixS * fixP, segT sec)
|
|
{
|
|
long rv;
|
|
|
|
if (fixP->fx_addsy != 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;
|
|
|
|
rv = fixP->fx_frag->fr_address + fixP->fx_where;
|
|
switch (fixP->fx_r_type)
|
|
{
|
|
case BFD_RELOC_8_PCREL:
|
|
rv += 1;
|
|
break;
|
|
case BFD_RELOC_16_PCREL:
|
|
rv += 2;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
md_apply_fix (struct fix * f ATTRIBUTE_UNUSED,
|
|
valueT * t ATTRIBUTE_UNUSED,
|
|
segT s ATTRIBUTE_UNUSED)
|
|
{
|
|
char * op;
|
|
unsigned long val;
|
|
|
|
if (f->fx_addsy && S_FORCE_RELOC (f->fx_addsy, 1))
|
|
return;
|
|
if (f->fx_subsy && S_FORCE_RELOC (f->fx_subsy, 1))
|
|
return;
|
|
|
|
op = f->fx_frag->fr_literal + f->fx_where;
|
|
val = (unsigned long) * t;
|
|
|
|
switch (f->fx_r_type)
|
|
{
|
|
case BFD_RELOC_NONE:
|
|
break;
|
|
|
|
case BFD_RELOC_RL78_RELAX:
|
|
f->fx_done = 1;
|
|
break;
|
|
|
|
case BFD_RELOC_8:
|
|
case BFD_RELOC_8_PCREL:
|
|
op[0] = val;
|
|
break;
|
|
|
|
case BFD_RELOC_16:
|
|
case BFD_RELOC_16_PCREL:
|
|
op[0] = val;
|
|
op[1] = val >> 8;
|
|
break;
|
|
|
|
case BFD_RELOC_24:
|
|
op[0] = val;
|
|
op[1] = val >> 8;
|
|
op[2] = val >> 16;
|
|
break;
|
|
|
|
case BFD_RELOC_32:
|
|
case BFD_RELOC_RL78_DIFF:
|
|
op[0] = val;
|
|
op[1] = val >> 8;
|
|
op[2] = val >> 16;
|
|
op[3] = val >> 24;
|
|
break;
|
|
|
|
default:
|
|
as_bad (_("Unknown reloc in md_apply_fix: %s"),
|
|
bfd_get_reloc_code_name (f->fx_r_type));
|
|
break;
|
|
}
|
|
|
|
if (f->fx_addsy == NULL)
|
|
f->fx_done = 1;
|
|
}
|
|
|
|
valueT
|
|
md_section_align (segT segment, valueT size)
|
|
{
|
|
int align = bfd_get_section_alignment (stdoutput, segment);
|
|
return ((size + (1 << align) - 1) & (-1 << align));
|
|
}
|
|
|
|
void
|
|
md_convert_frag (bfd * abfd ATTRIBUTE_UNUSED,
|
|
segT segment ATTRIBUTE_UNUSED,
|
|
fragS * fragP ATTRIBUTE_UNUSED)
|
|
{
|
|
/* No relaxation yet */
|
|
fragP->fr_var = 0;
|
|
}
|