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binutils-gdb/gas/config/tc-z80.c
Nick Clifton ec2655a6a7 Switch to GPLv3
2007-07-03 11:01:12 +00:00

2032 lines
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/* tc-z80.c -- Assemble code for the Zilog Z80 and ASCII R800
Copyright 2005, 2006, 2007 Free Software Foundation, Inc.
Contributed by Arnold Metselaar <arnold_m@operamail.com>
This file is part of GAS, the GNU Assembler.
GAS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GAS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GAS; see the file COPYING. If not, write to the Free
Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA
02110-1301, USA. */
#include "as.h"
#include "safe-ctype.h"
#include "subsegs.h"
/* Exported constants. */
const char comment_chars[] = ";\0";
const char line_comment_chars[] = "#;\0";
const char line_separator_chars[] = "\0";
const char EXP_CHARS[] = "eE\0";
const char FLT_CHARS[] = "RrFf\0";
/* For machine specific options. */
const char * md_shortopts = ""; /* None yet. */
enum options
{
OPTION_MACH_Z80 = OPTION_MD_BASE,
OPTION_MACH_R800,
OPTION_MACH_IUD,
OPTION_MACH_WUD,
OPTION_MACH_FUD,
OPTION_MACH_IUP,
OPTION_MACH_WUP,
OPTION_MACH_FUP
};
#define INS_Z80 1
#define INS_UNDOC 2
#define INS_UNPORT 4
#define INS_R800 8
struct option md_longopts[] =
{
{ "z80", no_argument, NULL, OPTION_MACH_Z80},
{ "r800", no_argument, NULL, OPTION_MACH_R800},
{ "ignore-undocumented-instructions", no_argument, NULL, OPTION_MACH_IUD },
{ "Wnud", no_argument, NULL, OPTION_MACH_IUD },
{ "warn-undocumented-instructions", no_argument, NULL, OPTION_MACH_WUD },
{ "Wud", no_argument, NULL, OPTION_MACH_WUD },
{ "forbid-undocumented-instructions", no_argument, NULL, OPTION_MACH_FUD },
{ "Fud", no_argument, NULL, OPTION_MACH_FUD },
{ "ignore-unportable-instructions", no_argument, NULL, OPTION_MACH_IUP },
{ "Wnup", no_argument, NULL, OPTION_MACH_IUP },
{ "warn-unportable-instructions", no_argument, NULL, OPTION_MACH_WUP },
{ "Wup", no_argument, NULL, OPTION_MACH_WUP },
{ "forbid-unportable-instructions", no_argument, NULL, OPTION_MACH_FUP },
{ "Fup", no_argument, NULL, OPTION_MACH_FUP },
{ NULL, no_argument, NULL, 0 }
} ;
size_t md_longopts_size = sizeof (md_longopts);
extern int coff_flags;
/* Instruction classes that silently assembled. */
static int ins_ok = INS_Z80 | INS_UNDOC;
/* Instruction classes that generate errors. */
static int ins_err = INS_R800;
/* Instruction classes actually used, determines machine type. */
static int ins_used = INS_Z80;
int
md_parse_option (int c, char* arg ATTRIBUTE_UNUSED)
{
switch (c)
{
default:
return 0;
case OPTION_MACH_Z80:
ins_ok &= ~INS_R800;
ins_err |= INS_R800;
break;
case OPTION_MACH_R800:
ins_ok = INS_Z80 | INS_UNDOC | INS_R800;
ins_err = INS_UNPORT;
break;
case OPTION_MACH_IUD:
ins_ok |= INS_UNDOC;
ins_err &= ~INS_UNDOC;
break;
case OPTION_MACH_IUP:
ins_ok |= INS_UNDOC | INS_UNPORT;
ins_err &= ~(INS_UNDOC | INS_UNPORT);
break;
case OPTION_MACH_WUD:
if ((ins_ok & INS_R800) == 0)
{
ins_ok &= ~(INS_UNDOC|INS_UNPORT);
ins_err &= ~INS_UNDOC;
}
break;
case OPTION_MACH_WUP:
ins_ok &= ~INS_UNPORT;
ins_err &= ~(INS_UNDOC|INS_UNPORT);
break;
case OPTION_MACH_FUD:
if ((ins_ok & INS_R800) == 0)
{
ins_ok &= (INS_UNDOC | INS_UNPORT);
ins_err |= INS_UNDOC | INS_UNPORT;
}
break;
case OPTION_MACH_FUP:
ins_ok &= ~INS_UNPORT;
ins_err |= INS_UNPORT;
break;
}
return 1;
}
void
md_show_usage (FILE * f)
{
fprintf (f, "\n\
CPU model/instruction set options:\n\
\n\
-z80\t\t assemble for Z80\n\
-ignore-undocumented-instructions\n\
-Wnud\n\
\tsilently assemble undocumented Z80-instructions that work on R800\n\
-ignore-unportable-instructions\n\
-Wnup\n\
\tsilently assemble all undocumented Z80-instructions\n\
-warn-undocumented-instructions\n\
-Wud\n\
\tissue warnings for undocumented Z80-instructions that work on R800\n\
-warn-unportable-instructions\n\
-Wup\n\
\tissue warnings for other undocumented Z80-instructions\n\
-forbid-undocumented-instructions\n\
-Fud\n\
\ttreat all undocumented z80-instructions as errors\n\
-forbid-unportable-instructions\n\
-Fup\n\
\ttreat undocumented z80-instructions that do not work on R800 as errors\n\
-r800\t assemble for R800\n\n\
Default: -z80 -ignore-undocument-instructions -warn-unportable-instructions.\n");
}
static symbolS * zero;
void
md_begin (void)
{
expressionS nul;
char * p;
p = input_line_pointer;
input_line_pointer = "0";
nul.X_md=0;
expression (& nul);
input_line_pointer = p;
zero = make_expr_symbol (& nul);
/* We do not use relaxation (yet). */
linkrelax = 0;
}
void
z80_md_end (void)
{
int mach_type;
if (ins_used & (INS_UNPORT | INS_R800))
ins_used |= INS_UNDOC;
switch (ins_used)
{
case INS_Z80:
mach_type = bfd_mach_z80strict;
break;
case INS_Z80|INS_UNDOC:
mach_type = bfd_mach_z80;
break;
case INS_Z80|INS_UNDOC|INS_UNPORT:
mach_type = bfd_mach_z80full;
break;
case INS_Z80|INS_UNDOC|INS_R800:
mach_type = bfd_mach_r800;
break;
default:
mach_type = 0;
}
bfd_set_arch_mach (stdoutput, TARGET_ARCH, mach_type);
}
static const char *
skip_space (const char *s)
{
while (*s == ' ' || *s == '\t')
++s;
return s;
}
/* A non-zero return-value causes a continue in the
function read_a_source_file () in ../read.c. */
int
z80_start_line_hook (void)
{
char *p, quote;
char buf[4];
/* Convert one character constants. */
for (p = input_line_pointer; *p && *p != '\n'; ++p)
{
switch (*p)
{
case '\'':
if (p[1] != 0 && p[1] != '\'' && p[2] == '\'')
{
snprintf (buf, 4, "%3d", (unsigned char)p[1]);
*p++ = buf[0];
*p++ = buf[1];
*p++ = buf[2];
break;
}
case '"':
for (quote = *p++; quote != *p && '\n' != *p; ++p)
/* No escapes. */ ;
if (quote != *p)
{
as_bad (_("-- unterminated string"));
ignore_rest_of_line ();
return 1;
}
break;
}
}
/* Check for <label>[:] [.](EQU|DEFL) <value>. */
if (is_name_beginner (*input_line_pointer))
{
char c, *rest, *line_start;
int len;
symbolS * symbolP;
line_start = input_line_pointer;
LISTING_NEWLINE ();
if (ignore_input ())
return 0;
c = get_symbol_end ();
rest = input_line_pointer + 1;
if (*rest == ':')
++rest;
if (*rest == ' ' || *rest == '\t')
++rest;
if (*rest == '.')
++rest;
if (strncasecmp (rest, "EQU", 3) == 0)
len = 3;
else if (strncasecmp (rest, "DEFL", 4) == 0)
len = 4;
else
len = 0;
if (len && (rest[len] == ' ' || rest[len] == '\t'))
{
/* Handle assignment here. */
input_line_pointer = rest + len;
if (line_start[-1] == '\n')
bump_line_counters ();
/* Most Z80 assemblers require the first definition of a
label to use "EQU" and redefinitions to have "DEFL". */
if (len == 3 && (symbolP = symbol_find (line_start)) != NULL)
{
if (S_IS_DEFINED (symbolP) || symbol_equated_p (symbolP))
as_bad (_("symbol `%s' is already defined"), line_start);
}
equals (line_start, 1);
return 1;
}
else
{
/* Restore line and pointer. */
*input_line_pointer = c;
input_line_pointer = line_start;
}
}
return 0;
}
symbolS *
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
{
return NULL;
}
char *
md_atof (int type ATTRIBUTE_UNUSED, char *litP ATTRIBUTE_UNUSED,
int *sizeP ATTRIBUTE_UNUSED)
{
return _("floating point numbers are not implemented");
}
valueT
md_section_align (segT seg ATTRIBUTE_UNUSED, valueT size)
{
return size;
}
long
md_pcrel_from (fixS * fixp)
{
return fixp->fx_where +
fixp->fx_frag->fr_address + 1;
}
typedef const char * (asfunc)(char, char, const char*);
typedef struct _table_t
{
char* name;
char prefix;
char opcode;
asfunc * fp;
} table_t;
/* Compares the key for structs that start with a char * to the key. */
static int
key_cmp (const void * a, const void * b)
{
const char *str_a, *str_b;
str_a = *((const char**)a);
str_b = *((const char**)b);
return strcmp (str_a, str_b);
}
#define BUFLEN 8 /* Large enough for any keyword. */
char buf[BUFLEN];
const char *key = buf;
#define R_STACKABLE (0x80)
#define R_ARITH (0x40)
#define R_IX (0x20)
#define R_IY (0x10)
#define R_INDEX (R_IX | R_IY)
#define REG_A (7)
#define REG_B (0)
#define REG_C (1)
#define REG_D (2)
#define REG_E (3)
#define REG_H (4)
#define REG_L (5)
#define REG_F (6 | 8)
#define REG_I (9)
#define REG_R (10)
#define REG_AF (3 | R_STACKABLE)
#define REG_BC (0 | R_STACKABLE | R_ARITH)
#define REG_DE (1 | R_STACKABLE | R_ARITH)
#define REG_HL (2 | R_STACKABLE | R_ARITH)
#define REG_SP (3 | R_ARITH)
static const struct reg_entry
{
char* name;
int number;
} regtable[] =
{
{"a", REG_A },
{"af", REG_AF },
{"b", REG_B },
{"bc", REG_BC },
{"c", REG_C },
{"d", REG_D },
{"de", REG_DE },
{"e", REG_E },
{"f", REG_F },
{"h", REG_H },
{"hl", REG_HL },
{"i", REG_I },
{"ix", REG_HL | R_IX },
{"ixh",REG_H | R_IX },
{"ixl",REG_L | R_IX },
{"iy", REG_HL | R_IY },
{"iyh",REG_H | R_IY },
{"iyl",REG_L | R_IY },
{"l", REG_L },
{"r", REG_R },
{"sp", REG_SP },
} ;
/* Prevent an error on a line from also generating
a "junk at end of line" error message. */
static char err_flag;
static void
error (const char * message)
{
as_bad (message);
err_flag = 1;
}
static void
ill_op (void)
{
error (_("illegal operand"));
}
static void
wrong_mach (int ins_type)
{
const char *p;
switch (ins_type)
{
case INS_UNDOC:
p = "undocumented instruction";
break;
case INS_UNPORT:
p = "instruction does not work on R800";
break;
case INS_R800:
p = "instruction only works R800";
break;
default:
p = 0; /* Not reachable. */
}
if (ins_type & ins_err)
error (_(p));
else
as_warn (_(p));
}
static void
check_mach (int ins_type)
{
if ((ins_type & ins_ok) == 0)
wrong_mach (ins_type);
ins_used |= ins_type;
}
/* Check whether an expression is indirect. */
static int
is_indir (const char *s)
{
char quote;
const char *p;
int indir, depth;
/* Indirection is indicated with parentheses. */
indir = (*s == '(');
for (p = s, depth = 0; *p && *p != ','; ++p)
{
switch (*p)
{
case '"':
case '\'':
for (quote = *p++; quote != *p && *p != '\n'; ++p)
if (*p == '\\' && p[1])
++p;
break;
case '(':
++ depth;
break;
case ')':
-- depth;
if (depth == 0)
{
p = skip_space (p + 1);
if (*p && *p != ',')
indir = 0;
--p;
}
if (depth < 0)
error (_("mismatched parentheses"));
break;
}
}
if (depth != 0)
error (_("mismatched parentheses"));
return indir;
}
/* Parse general expression. */
static const char *
parse_exp2 (const char *s, expressionS *op, segT *pseg)
{
const char *p;
int indir;
int i;
const struct reg_entry * regp;
expressionS offset;
p = skip_space (s);
op->X_md = indir = is_indir (p);
if (indir)
p = skip_space (p + 1);
for (i = 0; i < BUFLEN; ++i)
{
if (!ISALPHA (p[i])) /* Register names consist of letters only. */
break;
buf[i] = TOLOWER (p[i]);
}
if ((i < BUFLEN) && ((p[i] == 0) || (strchr (")+-, \t", p[i]))))
{
buf[i] = 0;
regp = bsearch (& key, regtable, ARRAY_SIZE (regtable),
sizeof (regtable[0]), key_cmp);
if (regp)
{
*pseg = reg_section;
op->X_add_symbol = op->X_op_symbol = 0;
op->X_add_number = regp->number;
op->X_op = O_register;
p += strlen (regp->name);
p = skip_space (p);
if (indir)
{
if (*p == ')')
++p;
if ((regp->number & R_INDEX) && (regp->number & R_ARITH))
{
op->X_op = O_md1;
if ((*p == '+') || (*p == '-'))
{
input_line_pointer = (char*) p;
expression (& offset);
p = skip_space (input_line_pointer);
if (*p != ')')
error (_("bad offset expression syntax"));
else
++ p;
op->X_add_symbol = make_expr_symbol (& offset);
return p;
}
/* We treat (i[xy]) as (i[xy]+0), which is how it will
end up anyway, unless we're processing jp (i[xy]). */
op->X_add_symbol = zero;
}
}
p = skip_space (p);
if ((*p == 0) || (*p == ','))
return p;
}
}
/* Not an argument involving a register; use the generic parser. */
input_line_pointer = (char*) s ;
*pseg = expression (op);
if (op->X_op == O_absent)
error (_("missing operand"));
if (op->X_op == O_illegal)
error (_("bad expression syntax"));
return input_line_pointer;
}
static const char *
parse_exp (const char *s, expressionS *op)
{
segT dummy;
return parse_exp2 (s, op, & dummy);
}
/* Condition codes, including some synonyms provided by HiTech zas. */
static const struct reg_entry cc_tab[] =
{
{ "age", 6 << 3 },
{ "alt", 7 << 3 },
{ "c", 3 << 3 },
{ "di", 4 << 3 },
{ "ei", 5 << 3 },
{ "lge", 2 << 3 },
{ "llt", 3 << 3 },
{ "m", 7 << 3 },
{ "nc", 2 << 3 },
{ "nz", 0 << 3 },
{ "p", 6 << 3 },
{ "pe", 5 << 3 },
{ "po", 4 << 3 },
{ "z", 1 << 3 },
} ;
/* Parse condition code. */
static const char *
parse_cc (const char *s, char * op)
{
const char *p;
int i;
struct reg_entry * cc_p;
for (i = 0; i < BUFLEN; ++i)
{
if (!ISALPHA (s[i])) /* Condition codes consist of letters only. */
break;
buf[i] = TOLOWER (s[i]);
}
if ((i < BUFLEN)
&& ((s[i] == 0) || (s[i] == ',')))
{
buf[i] = 0;
cc_p = bsearch (&key, cc_tab, ARRAY_SIZE (cc_tab),
sizeof (cc_tab[0]), key_cmp);
}
else
cc_p = NULL;
if (cc_p)
{
*op = cc_p->number;
p = s + i;
}
else
p = NULL;
return p;
}
static const char *
emit_insn (char prefix, char opcode, const char * args)
{
char *p;
if (prefix)
{
p = frag_more (2);
*p++ = prefix;
}
else
p = frag_more (1);
*p = opcode;
return args;
}
void z80_cons_fix_new (fragS *frag_p, int offset, int nbytes, expressionS *exp)
{
bfd_reloc_code_real_type r[4] =
{
BFD_RELOC_8,
BFD_RELOC_16,
BFD_RELOC_24,
BFD_RELOC_32
};
if (nbytes < 1 || nbytes > 4)
{
as_bad (_("unsupported BFD relocation size %u"), nbytes);
}
else
{
fix_new_exp (frag_p, offset, nbytes, exp, 0, r[nbytes-1]);
}
}
static void
emit_byte (expressionS * val, bfd_reloc_code_real_type r_type)
{
char *p;
int lo, hi;
fixS * fixp;
p = frag_more (1);
*p = val->X_add_number;
if ((r_type == BFD_RELOC_8_PCREL) && (val->X_op == O_constant))
{
as_bad(_("cannot make a relative jump to an absolute location"));
}
else if (val->X_op == O_constant)
{
lo = -128;
hi = (BFD_RELOC_8 == r_type) ? 255 : 127;
if ((val->X_add_number < lo) || (val->X_add_number > hi))
{
if (r_type == BFD_RELOC_Z80_DISP8)
as_bad (_("offset too large"));
else
as_warn (_("overflow"));
}
}
else
{
fixp = fix_new_exp (frag_now, p - frag_now->fr_literal, 1, val,
(r_type == BFD_RELOC_8_PCREL) ? TRUE : FALSE, r_type);
/* FIXME : Process constant offsets immediately. */
}
}
static void
emit_word (expressionS * val)
{
char *p;
p = frag_more (2);
if ( (val->X_op == O_register)
|| (val->X_op == O_md1))
ill_op ();
else
{
*p = val->X_add_number;
p[1] = (val->X_add_number>>8);
if (val->X_op != O_constant)
fix_new_exp (frag_now, p - frag_now->fr_literal, 2,
val, FALSE, BFD_RELOC_16);
}
}
static void
emit_mx (char prefix, char opcode, int shift, expressionS * arg)
/* The operand m may be r, (hl), (ix+d), (iy+d),
if 0 == prefix m may also be ixl, ixh, iyl, iyh. */
{
char *q;
int rnum;
rnum = arg->X_add_number;
switch (arg->X_op)
{
case O_register:
if (arg->X_md)
{
if (rnum != REG_HL)
{
ill_op ();
break;
}
else
rnum = 6;
}
else
{
if ((prefix == 0) && (rnum & R_INDEX))
{
prefix = (rnum & R_IX) ? 0xDD : 0xFD;
check_mach (INS_UNDOC);
rnum &= ~R_INDEX;
}
if (rnum > 7)
{
ill_op ();
break;
}
}
q = frag_more (prefix ? 2 : 1);
if (prefix)
* q ++ = prefix;
* q ++ = opcode + (rnum << shift);
break;
case O_md1:
q = frag_more (2);
*q++ = (rnum & R_IX) ? 0xDD : 0xFD;
*q = (prefix) ? prefix : (opcode + (6 << shift));
emit_byte (symbol_get_value_expression (arg->X_add_symbol),
BFD_RELOC_Z80_DISP8);
if (prefix)
{
q = frag_more (1);
*q = opcode+(6<<shift);
}
break;
default:
abort ();
}
}
/* The operand m may be r, (hl), (ix+d), (iy+d),
if 0 = prefix m may also be ixl, ixh, iyl, iyh. */
static const char *
emit_m (char prefix, char opcode, const char *args)
{
expressionS arg_m;
const char *p;
p = parse_exp (args, &arg_m);
switch (arg_m.X_op)
{
case O_md1:
case O_register:
emit_mx (prefix, opcode, 0, &arg_m);
break;
default:
ill_op ();
}
return p;
}
/* The operand m may be as above or one of the undocumented
combinations (ix+d),r and (iy+d),r (if unportable instructions
are allowed). */
static const char *
emit_mr (char prefix, char opcode, const char *args)
{
expressionS arg_m, arg_r;
const char *p;
p = parse_exp (args, & arg_m);
switch (arg_m.X_op)
{
case O_md1:
if (*p == ',')
{
p = parse_exp (p + 1, & arg_r);
if ((arg_r.X_md == 0)
&& (arg_r.X_op == O_register)
&& (arg_r.X_add_number < 8))
opcode += arg_r.X_add_number-6; /* Emit_mx () will add 6. */
else
{
ill_op ();
break;
}
check_mach (INS_UNPORT);
}
case O_register:
emit_mx (prefix, opcode, 0, & arg_m);
break;
default:
ill_op ();
}
return p;
}
static void
emit_sx (char prefix, char opcode, expressionS * arg_p)
{
char *q;
switch (arg_p->X_op)
{
case O_register:
case O_md1:
emit_mx (prefix, opcode, 0, arg_p);
break;
default:
if (arg_p->X_md)
ill_op ();
else
{
q = frag_more (prefix ? 2 : 1);
if (prefix)
*q++ = prefix;
*q = opcode ^ 0x46;
emit_byte (arg_p, BFD_RELOC_8);
}
}
}
/* The operand s may be r, (hl), (ix+d), (iy+d), n. */
static const char *
emit_s (char prefix, char opcode, const char *args)
{
expressionS arg_s;
const char *p;
p = parse_exp (args, & arg_s);
emit_sx (prefix, opcode, & arg_s);
return p;
}
static const char *
emit_call (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
expressionS addr;
const char *p; char *q;
p = parse_exp (args, &addr);
if (addr.X_md)
ill_op ();
else
{
q = frag_more (1);
*q = opcode;
emit_word (& addr);
}
return p;
}
/* Operand may be rr, r, (hl), (ix+d), (iy+d). */
static const char *
emit_incdec (char prefix, char opcode, const char * args)
{
expressionS operand;
int rnum;
const char *p; char *q;
p = parse_exp (args, &operand);
rnum = operand.X_add_number;
if ((! operand.X_md)
&& (operand.X_op == O_register)
&& (R_ARITH&rnum))
{
q = frag_more ((rnum & R_INDEX) ? 2 : 1);
if (rnum & R_INDEX)
*q++ = (rnum & R_IX) ? 0xDD : 0xFD;
*q = prefix + ((rnum & 3) << 4);
}
else
{
if ((operand.X_op == O_md1) || (operand.X_op == O_register))
emit_mx (0, opcode, 3, & operand);
else
ill_op ();
}
return p;
}
static const char *
emit_jr (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
expressionS addr;
const char *p;
char *q;
p = parse_exp (args, &addr);
if (addr.X_md)
ill_op ();
else
{
q = frag_more (1);
*q = opcode;
emit_byte (&addr, BFD_RELOC_8_PCREL);
}
return p;
}
static const char *
emit_jp (char prefix, char opcode, const char * args)
{
expressionS addr;
const char *p;
char *q;
int rnum;
p = parse_exp (args, & addr);
if (addr.X_md)
{
rnum = addr.X_add_number;
if ((addr.X_op == O_register && (rnum & ~R_INDEX) == REG_HL)
/* An operand (i[xy]) would have been rewritten to (i[xy]+0)
in parse_exp (). */
|| (addr.X_op == O_md1 && addr.X_add_symbol == zero))
{
q = frag_more ((rnum & R_INDEX) ? 2 : 1);
if (rnum & R_INDEX)
*q++ = (rnum & R_IX) ? 0xDD : 0xFD;
*q = prefix;
}
else
ill_op ();
}
else
{
q = frag_more (1);
*q = opcode;
emit_word (& addr);
}
return p;
}
static const char *
emit_im (char prefix, char opcode, const char * args)
{
expressionS mode;
const char *p;
char *q;
p = parse_exp (args, & mode);
if (mode.X_md || (mode.X_op != O_constant))
ill_op ();
else
switch (mode.X_add_number)
{
case 1:
case 2:
++mode.X_add_number;
/* Fall through. */
case 0:
q = frag_more (2);
*q++ = prefix;
*q = opcode + 8*mode.X_add_number;
break;
default:
ill_op ();
}
return p;
}
static const char *
emit_pop (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
expressionS regp;
const char *p;
char *q;
p = parse_exp (args, & regp);
if ((!regp.X_md)
&& (regp.X_op == O_register)
&& (regp.X_add_number & R_STACKABLE))
{
int rnum;
rnum = regp.X_add_number;
if (rnum&R_INDEX)
{
q = frag_more (2);
*q++ = (rnum&R_IX)?0xDD:0xFD;
}
else
q = frag_more (1);
*q = opcode + ((rnum & 3) << 4);
}
else
ill_op ();
return p;
}
static const char *
emit_retcc (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
char cc, *q;
const char *p;
p = parse_cc (args, &cc);
q = frag_more (1);
if (p)
*q = opcode + cc;
else
*q = prefix;
return p ? p : args;
}
static const char *
emit_adc (char prefix, char opcode, const char * args)
{
expressionS term;
int rnum;
const char *p;
char *q;
p = parse_exp (args, &term);
if (*p++ != ',')
{
error (_("bad intruction syntax"));
return p;
}
if ((term.X_md) || (term.X_op != O_register))
ill_op ();
else
switch (term.X_add_number)
{
case REG_A:
p = emit_s (0, prefix, p);
break;
case REG_HL:
p = parse_exp (p, &term);
if ((!term.X_md) && (term.X_op == O_register))
{
rnum = term.X_add_number;
if (R_ARITH == (rnum & (R_ARITH | R_INDEX)))
{
q = frag_more (2);
*q++ = 0xED;
*q = opcode + ((rnum & 3) << 4);
break;
}
}
/* Fall through. */
default:
ill_op ();
}
return p;
}
static const char *
emit_add (char prefix, char opcode, const char * args)
{
expressionS term;
int lhs, rhs;
const char *p;
char *q;
p = parse_exp (args, &term);
if (*p++ != ',')
{
error (_("bad intruction syntax"));
return p;
}
if ((term.X_md) || (term.X_op != O_register))
ill_op ();
else
switch (term.X_add_number & ~R_INDEX)
{
case REG_A:
p = emit_s (0, prefix, p);
break;
case REG_HL:
lhs = term.X_add_number;
p = parse_exp (p, &term);
if ((!term.X_md) && (term.X_op == O_register))
{
rhs = term.X_add_number;
if ((rhs & R_ARITH)
&& ((rhs == lhs) || ((rhs & ~R_INDEX) != REG_HL)))
{
q = frag_more ((lhs & R_INDEX) ? 2 : 1);
if (lhs & R_INDEX)
*q++ = (lhs & R_IX) ? 0xDD : 0xFD;
*q = opcode + ((rhs & 3) << 4);
break;
}
}
/* Fall through. */
default:
ill_op ();
}
return p;
}
static const char *
emit_bit (char prefix, char opcode, const char * args)
{
expressionS b;
int bn;
const char *p;
p = parse_exp (args, &b);
if (*p++ != ',')
error (_("bad intruction syntax"));
bn = b.X_add_number;
if ((!b.X_md)
&& (b.X_op == O_constant)
&& (0 <= bn)
&& (bn < 8))
{
if (opcode == 0x40)
/* Bit : no optional third operand. */
p = emit_m (prefix, opcode + (bn << 3), p);
else
/* Set, res : resulting byte can be copied to register. */
p = emit_mr (prefix, opcode + (bn << 3), p);
}
else
ill_op ();
return p;
}
static const char *
emit_jpcc (char prefix, char opcode, const char * args)
{
char cc;
const char *p;
p = parse_cc (args, & cc);
if (p && *p++ == ',')
p = emit_call (0, opcode + cc, p);
else
p = (prefix == (char)0xC3)
? emit_jp (0xE9, prefix, args)
: emit_call (0, prefix, args);
return p;
}
static const char *
emit_jrcc (char prefix, char opcode, const char * args)
{
char cc;
const char *p;
p = parse_cc (args, &cc);
if (p && *p++ == ',')
{
if (cc > (3 << 3))
error (_("condition code invalid for jr"));
else
p = emit_jr (0, opcode + cc, p);
}
else
p = emit_jr (0, prefix, args);
return p;
}
static const char *
emit_ex (char prefix_in ATTRIBUTE_UNUSED,
char opcode_in ATTRIBUTE_UNUSED, const char * args)
{
expressionS op;
const char * p;
char prefix, opcode;
p = parse_exp (args, &op);
p = skip_space (p);
if (*p++ != ',')
{
error (_("bad instruction syntax"));
return p;
}
prefix = opcode = 0;
if (op.X_op == O_register)
switch (op.X_add_number | (op.X_md ? 0x8000 : 0))
{
case REG_AF:
if (TOLOWER (*p++) == 'a' && TOLOWER (*p++) == 'f')
{
/* The scrubber changes '\'' to '`' in this context. */
if (*p == '`')
++p;
opcode = 0x08;
}
break;
case REG_DE:
if (TOLOWER (*p++) == 'h' && TOLOWER (*p++) == 'l')
opcode = 0xEB;
break;
case REG_SP|0x8000:
p = parse_exp (p, & op);
if (op.X_op == O_register
&& op.X_md == 0
&& (op.X_add_number & ~R_INDEX) == REG_HL)
{
opcode = 0xE3;
if (R_INDEX & op.X_add_number)
prefix = (R_IX & op.X_add_number) ? 0xDD : 0xFD;
}
break;
}
if (opcode)
emit_insn (prefix, opcode, p);
else
ill_op ();
return p;
}
static const char *
emit_in (char prefix ATTRIBUTE_UNUSED, char opcode ATTRIBUTE_UNUSED,
const char * args)
{
expressionS reg, port;
const char *p;
char *q;
p = parse_exp (args, &reg);
if (*p++ != ',')
{
error (_("bad intruction syntax"));
return p;
}
p = parse_exp (p, &port);
if (reg.X_md == 0
&& reg.X_op == O_register
&& (reg.X_add_number <= 7 || reg.X_add_number == REG_F)
&& (port.X_md))
{
if (port.X_op != O_md1 && port.X_op != O_register)
{
if (REG_A == reg.X_add_number)
{
q = frag_more (1);
*q = 0xDB;
emit_byte (&port, BFD_RELOC_8);
}
else
ill_op ();
}
else
{
if (port.X_add_number == REG_C)
{
if (reg.X_add_number == REG_F)
check_mach (INS_UNDOC);
else
{
q = frag_more (2);
*q++ = 0xED;
*q = 0x40|((reg.X_add_number&7)<<3);
}
}
else
ill_op ();
}
}
else
ill_op ();
return p;
}
static const char *
emit_out (char prefix ATTRIBUTE_UNUSED, char opcode ATTRIBUTE_UNUSED,
const char * args)
{
expressionS reg, port;
const char *p;
char *q;
p = parse_exp (args, & port);
if (*p++ != ',')
{
error (_("bad intruction syntax"));
return p;
}
p = parse_exp (p, &reg);
if (!port.X_md)
{ ill_op (); return p; }
/* Allow "out (c), 0" as unportable instruction. */
if (reg.X_op == O_constant && reg.X_add_number == 0)
{
check_mach (INS_UNPORT);
reg.X_op = O_register;
reg.X_add_number = 6;
}
if (reg.X_md
|| reg.X_op != O_register
|| reg.X_add_number > 7)
ill_op ();
else
if (port.X_op != O_register && port.X_op != O_md1)
{
if (REG_A == reg.X_add_number)
{
q = frag_more (1);
*q = 0xD3;
emit_byte (&port, BFD_RELOC_8);
}
else
ill_op ();
}
else
{
if (REG_C == port.X_add_number)
{
q = frag_more (2);
*q++ = 0xED;
*q = 0x41 | (reg.X_add_number << 3);
}
else
ill_op ();
}
return p;
}
static const char *
emit_rst (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
expressionS addr;
const char *p;
char *q;
p = parse_exp (args, &addr);
if (addr.X_op != O_constant)
{
error ("rst needs constant address");
return p;
}
if (addr.X_add_number & ~(7 << 3))
ill_op ();
else
{
q = frag_more (1);
*q = opcode + (addr.X_add_number & (7 << 3));
}
return p;
}
static void
emit_ldxhl (char prefix, char opcode, expressionS *src, expressionS *d)
{
char *q;
if (src->X_md)
ill_op ();
else
{
if (src->X_op == O_register)
{
if (src->X_add_number>7)
ill_op ();
if (prefix)
{
q = frag_more (2);
*q++ = prefix;
}
else
q = frag_more (1);
*q = opcode + src->X_add_number;
if (d)
emit_byte (d, BFD_RELOC_Z80_DISP8);
}
else
{
if (prefix)
{
q = frag_more (2);
*q++ = prefix;
}
else
q = frag_more (1);
*q = opcode^0x46;
if (d)
emit_byte (d, BFD_RELOC_Z80_DISP8);
emit_byte (src, BFD_RELOC_8);
}
}
}
static void
emit_ldreg (int dest, expressionS * src)
{
char *q;
int rnum;
switch (dest)
{
/* 8 Bit ld group: */
case REG_I:
case REG_R:
if (src->X_md == 0 && src->X_op == O_register && src->X_add_number == REG_A)
{
q = frag_more (2);
*q++ = 0xED;
*q = (dest == REG_I) ? 0x47 : 0x4F;
}
else
ill_op ();
break;
case REG_A:
if ((src->X_md) && src->X_op != O_register && src->X_op != O_md1)
{
q = frag_more (1);
*q = 0x3A;
emit_word (src);
break;
}
if ((src->X_md)
&& src->X_op == O_register
&& (src->X_add_number == REG_BC || src->X_add_number == REG_DE))
{
q = frag_more (1);
*q = 0x0A + ((dest & 1) << 4);
break;
}
if ((!src->X_md)
&& src->X_op == O_register
&& (src->X_add_number == REG_R || src->X_add_number == REG_I))
{
q = frag_more (2);
*q++ = 0xED;
*q = (src->X_add_number == REG_I) ? 0x57 : 0x5F;
break;
}
/* Fall through. */
case REG_B:
case REG_C:
case REG_D:
case REG_E:
emit_sx (0, 0x40 + (dest << 3), src);
break;
case REG_H:
case REG_L:
if ((src->X_md == 0)
&& (src->X_op == O_register)
&& (src->X_add_number & R_INDEX))
ill_op ();
else
emit_sx (0, 0x40 + (dest << 3), src);
break;
case R_IX | REG_H:
case R_IX | REG_L:
case R_IY | REG_H:
case R_IY | REG_L:
if (src->X_md)
{
ill_op ();
break;
}
check_mach (INS_UNDOC);
if (src-> X_op == O_register)
{
rnum = src->X_add_number;
if ((rnum & ~R_INDEX) < 8
&& ((rnum & R_INDEX) == (dest & R_INDEX)
|| ( (rnum & ~R_INDEX) != REG_H
&& (rnum & ~R_INDEX) != REG_L)))
{
q = frag_more (2);
*q++ = (dest & R_IX) ? 0xDD : 0xFD;
*q = 0x40 + ((dest & 0x07) << 3) + (rnum & 7);
}
else
ill_op ();
}
else
{
q = frag_more (2);
*q++ = (dest & R_IX) ? 0xDD : 0xFD;
*q = 0x06 + ((dest & 0x07) << 3);
emit_byte (src, BFD_RELOC_8);
}
break;
/* 16 Bit ld group: */
case REG_SP:
if (src->X_md == 0
&& src->X_op == O_register
&& REG_HL == (src->X_add_number &~ R_INDEX))
{
q = frag_more ((src->X_add_number & R_INDEX) ? 2 : 1);
if (src->X_add_number & R_INDEX)
*q++ = (src->X_add_number & R_IX) ? 0xDD : 0xFD;
*q = 0xF9;
break;
}
/* Fall through. */
case REG_BC:
case REG_DE:
if (src->X_op == O_register || src->X_op == O_md1)
ill_op ();
q = frag_more (src->X_md ? 2 : 1);
if (src->X_md)
{
*q++ = 0xED;
*q = 0x4B + ((dest & 3) << 4);
}
else
*q = 0x01 + ((dest & 3) << 4);
emit_word (src);
break;
case REG_HL:
case REG_HL | R_IX:
case REG_HL | R_IY:
if (src->X_op == O_register || src->X_op == O_md1)
ill_op ();
q = frag_more ((dest & R_INDEX) ? 2 : 1);
if (dest & R_INDEX)
* q ++ = (dest & R_IX) ? 0xDD : 0xFD;
*q = (src->X_md) ? 0x2A : 0x21;
emit_word (src);
break;
case REG_AF:
case REG_F:
ill_op ();
break;
default:
abort ();
}
}
static const char *
emit_ld (char prefix_in ATTRIBUTE_UNUSED, char opcode_in ATTRIBUTE_UNUSED,
const char * args)
{
expressionS dst, src;
const char *p;
char *q;
char prefix, opcode;
p = parse_exp (args, &dst);
if (*p++ != ',')
error (_("bad intruction syntax"));
p = parse_exp (p, &src);
switch (dst.X_op)
{
case O_md1:
emit_ldxhl ((dst.X_add_number & R_IX) ? 0xDD : 0xFD, 0x70,
&src, symbol_get_value_expression (dst.X_add_symbol));
break;
case O_register:
if (dst.X_md)
{
switch (dst.X_add_number)
{
case REG_BC:
case REG_DE:
if (src.X_md == 0 && src.X_op == O_register && src.X_add_number == REG_A)
{
q = frag_more (1);
*q = 0x02 + ( (dst.X_add_number & 1) << 4);
}
else
ill_op ();
break;
case REG_HL:
emit_ldxhl (0, 0x70, &src, NULL);
break;
default:
ill_op ();
}
}
else
emit_ldreg (dst.X_add_number, &src);
break;
default:
if (src.X_md != 0 || src.X_op != O_register)
ill_op ();
prefix = opcode = 0;
switch (src.X_add_number)
{
case REG_A:
opcode = 0x32; break;
case REG_BC: case REG_DE: case REG_SP:
prefix = 0xED; opcode = 0x43 + ((src.X_add_number&3)<<4); break;
case REG_HL:
opcode = 0x22; break;
case REG_HL|R_IX:
prefix = 0xDD; opcode = 0x22; break;
case REG_HL|R_IY:
prefix = 0xFD; opcode = 0x22; break;
}
if (opcode)
{
q = frag_more (prefix?2:1);
if (prefix)
*q++ = prefix;
*q = opcode;
emit_word (&dst);
}
else
ill_op ();
}
return p;
}
static void
emit_data (int size ATTRIBUTE_UNUSED)
{
const char *p, *q;
char *u, quote;
int cnt;
expressionS exp;
if (is_it_end_of_statement ())
{
demand_empty_rest_of_line ();
return;
}
p = skip_space (input_line_pointer);
do
{
if (*p == '\"' || *p == '\'')
{
for (quote = *p, q = ++p, cnt = 0; *p && quote != *p; ++p, ++cnt)
;
u = frag_more (cnt);
memcpy (u, q, cnt);
if (!*p)
as_warn (_("unterminated string"));
else
p = skip_space (p+1);
}
else
{
p = parse_exp (p, &exp);
if (exp.X_op == O_md1 || exp.X_op == O_register)
{
ill_op ();
break;
}
if (exp.X_md)
as_warn (_("parentheses ignored"));
emit_byte (&exp, BFD_RELOC_8);
p = skip_space (p);
}
}
while (*p++ == ',') ;
input_line_pointer = (char *)(p-1);
}
static const char *
emit_mulub (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
const char *p;
p = skip_space (args);
if (TOLOWER (*p++) != 'a' || *p++ != ',')
ill_op ();
else
{
char *q, reg;
reg = TOLOWER (*p++);
switch (reg)
{
case 'b':
case 'c':
case 'd':
case 'e':
check_mach (INS_R800);
if (!*skip_space (p))
{
q = frag_more (2);
*q++ = prefix;
*q = opcode + ((reg - 'b') << 3);
break;
}
default:
ill_op ();
}
}
return p;
}
static const char *
emit_muluw (char prefix ATTRIBUTE_UNUSED, char opcode, const char * args)
{
const char *p;
p = skip_space (args);
if (TOLOWER (*p++) != 'h' || TOLOWER (*p++) != 'l' || *p++ != ',')
ill_op ();
else
{
expressionS reg;
char *q;
p = parse_exp (p, & reg);
if ((!reg.X_md) && reg.X_op == O_register)
switch (reg.X_add_number)
{
case REG_BC:
case REG_SP:
check_mach (INS_R800);
q = frag_more (2);
*q++ = prefix;
*q = opcode + ((reg.X_add_number & 3) << 4);
break;
default:
ill_op ();
}
}
return p;
}
/* Port specific pseudo ops. */
const pseudo_typeS md_pseudo_table[] =
{
{ "db" , emit_data, 1},
{ "d24", cons, 3},
{ "d32", cons, 4},
{ "def24", cons, 3},
{ "def32", cons, 4},
{ "defb", emit_data, 1},
{ "defs", s_space, 1}, /* Synonym for ds on some assemblers. */
{ "defw", cons, 2},
{ "ds", s_space, 1}, /* Fill with bytes rather than words. */
{ "dw", cons, 2},
{ "psect", obj_coff_section, 0}, /* TODO: Translate attributes. */
{ "set", 0, 0}, /* Real instruction on z80. */
{ NULL, 0, 0 }
} ;
static table_t instab[] =
{
{ "adc", 0x88, 0x4A, emit_adc },
{ "add", 0x80, 0x09, emit_add },
{ "and", 0x00, 0xA0, emit_s },
{ "bit", 0xCB, 0x40, emit_bit },
{ "call", 0xCD, 0xC4, emit_jpcc },
{ "ccf", 0x00, 0x3F, emit_insn },
{ "cp", 0x00, 0xB8, emit_s },
{ "cpd", 0xED, 0xA9, emit_insn },
{ "cpdr", 0xED, 0xB9, emit_insn },
{ "cpi", 0xED, 0xA1, emit_insn },
{ "cpir", 0xED, 0xB1, emit_insn },
{ "cpl", 0x00, 0x2F, emit_insn },
{ "daa", 0x00, 0x27, emit_insn },
{ "dec", 0x0B, 0x05, emit_incdec },
{ "di", 0x00, 0xF3, emit_insn },
{ "djnz", 0x00, 0x10, emit_jr },
{ "ei", 0x00, 0xFB, emit_insn },
{ "ex", 0x00, 0x00, emit_ex},
{ "exx", 0x00, 0xD9, emit_insn },
{ "halt", 0x00, 0x76, emit_insn },
{ "im", 0xED, 0x46, emit_im },
{ "in", 0x00, 0x00, emit_in },
{ "inc", 0x03, 0x04, emit_incdec },
{ "ind", 0xED, 0xAA, emit_insn },
{ "indr", 0xED, 0xBA, emit_insn },
{ "ini", 0xED, 0xA2, emit_insn },
{ "inir", 0xED, 0xB2, emit_insn },
{ "jp", 0xC3, 0xC2, emit_jpcc },
{ "jr", 0x18, 0x20, emit_jrcc },
{ "ld", 0x00, 0x00, emit_ld },
{ "ldd", 0xED, 0xA8, emit_insn },
{ "lddr", 0xED, 0xB8, emit_insn },
{ "ldi", 0xED, 0xA0, emit_insn },
{ "ldir", 0xED, 0xB0, emit_insn },
{ "mulub", 0xED, 0xC5, emit_mulub }, /* R800 only. */
{ "muluw", 0xED, 0xC3, emit_muluw }, /* R800 only. */
{ "neg", 0xed, 0x44, emit_insn },
{ "nop", 0x00, 0x00, emit_insn },
{ "or", 0x00, 0xB0, emit_s },
{ "otdr", 0xED, 0xBB, emit_insn },
{ "otir", 0xED, 0xB3, emit_insn },
{ "out", 0x00, 0x00, emit_out },
{ "outd", 0xED, 0xAB, emit_insn },
{ "outi", 0xED, 0xA3, emit_insn },
{ "pop", 0x00, 0xC1, emit_pop },
{ "push", 0x00, 0xC5, emit_pop },
{ "res", 0xCB, 0x80, emit_bit },
{ "ret", 0xC9, 0xC0, emit_retcc },
{ "reti", 0xED, 0x4D, emit_insn },
{ "retn", 0xED, 0x45, emit_insn },
{ "rl", 0xCB, 0x10, emit_mr },
{ "rla", 0x00, 0x17, emit_insn },
{ "rlc", 0xCB, 0x00, emit_mr },
{ "rlca", 0x00, 0x07, emit_insn },
{ "rld", 0xED, 0x6F, emit_insn },
{ "rr", 0xCB, 0x18, emit_mr },
{ "rra", 0x00, 0x1F, emit_insn },
{ "rrc", 0xCB, 0x08, emit_mr },
{ "rrca", 0x00, 0x0F, emit_insn },
{ "rrd", 0xED, 0x67, emit_insn },
{ "rst", 0x00, 0xC7, emit_rst},
{ "sbc", 0x98, 0x42, emit_adc },
{ "scf", 0x00, 0x37, emit_insn },
{ "set", 0xCB, 0xC0, emit_bit },
{ "sla", 0xCB, 0x20, emit_mr },
{ "sli", 0xCB, 0x30, emit_mr },
{ "sll", 0xCB, 0x30, emit_mr },
{ "sra", 0xCB, 0x28, emit_mr },
{ "srl", 0xCB, 0x38, emit_mr },
{ "sub", 0x00, 0x90, emit_s },
{ "xor", 0x00, 0xA8, emit_s },
} ;
void
md_assemble (char* str)
{
const char *p;
char * old_ptr;
int i;
table_t *insp;
err_flag = 0;
old_ptr = input_line_pointer;
p = skip_space (str);
for (i = 0; (i < BUFLEN) && (ISALPHA (*p));)
buf[i++] = TOLOWER (*p++);
if (i == BUFLEN)
{
buf[BUFLEN-3] = buf[BUFLEN-2] = '.'; /* Mark opcode as abbreviated. */
buf[BUFLEN-1] = 0;
as_bad (_("Unknown instruction '%s'"), buf);
}
else if ((*p) && (!ISSPACE (*p)))
as_bad (_("syntax error"));
else
{
buf[i] = 0;
p = skip_space (p);
key = buf;
insp = bsearch (&key, instab, ARRAY_SIZE (instab),
sizeof (instab[0]), key_cmp);
if (!insp)
as_bad (_("Unknown instruction '%s'"), buf);
else
{
p = insp->fp (insp->prefix, insp->opcode, p);
p = skip_space (p);
if ((!err_flag) && *p)
as_bad (_("junk at end of line, first unrecognized character is `%c'"),
*p);
}
}
input_line_pointer = old_ptr;
}
void
md_apply_fix (fixS * fixP, valueT* valP, segT seg ATTRIBUTE_UNUSED)
{
long val = * (long *) valP;
char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
switch (fixP->fx_r_type)
{
case BFD_RELOC_8_PCREL:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
fixP->fx_no_overflow = (-128 <= val && val < 128);
if (!fixP->fx_no_overflow)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("relative jump out of range"));
*buf++ = val;
fixP->fx_done = 1;
}
break;
case BFD_RELOC_Z80_DISP8:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
fixP->fx_no_overflow = (-128 <= val && val < 128);
if (!fixP->fx_no_overflow)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("index offset out of range"));
*buf++ = val;
fixP->fx_done = 1;
}
break;
case BFD_RELOC_8:
if (val > 255 || val < -128)
as_warn_where (fixP->fx_file, fixP->fx_line, _("overflow"));
*buf++ = val;
fixP->fx_no_overflow = 1;
if (fixP->fx_addsy == NULL)
fixP->fx_done = 1;
break;
case BFD_RELOC_16:
*buf++ = val;
*buf++ = (val >> 8);
fixP->fx_no_overflow = 1;
if (fixP->fx_addsy == NULL)
fixP->fx_done = 1;
break;
case BFD_RELOC_24: /* Def24 may produce this. */
*buf++ = val;
*buf++ = (val >> 8);
*buf++ = (val >> 16);
fixP->fx_no_overflow = 1;
if (fixP->fx_addsy == NULL)
fixP->fx_done = 1;
break;
case BFD_RELOC_32: /* Def32 and .long may produce this. */
*buf++ = val;
*buf++ = (val >> 8);
*buf++ = (val >> 16);
*buf++ = (val >> 24);
if (fixP->fx_addsy == NULL)
fixP->fx_done = 1;
break;
default:
printf (_("md_apply_fix: unknown r_type 0x%x\n"), fixP->fx_r_type);
abort ();
}
}
/* GAS will call this to generate a reloc. GAS will pass the
resulting reloc to `bfd_install_relocation'. This currently works
poorly, as `bfd_install_relocation' often does the wrong thing, and
instances of `tc_gen_reloc' have been written to work around the
problems, which in turns makes it difficult to fix
`bfd_install_relocation'. */
/* If while processing a fixup, a reloc really
needs to be created then it is done here. */
arelent *
tc_gen_reloc (asection *seg ATTRIBUTE_UNUSED , fixS *fixp)
{
arelent *reloc;
if (! bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type))
{
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 = 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->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
reloc->addend = fixp->fx_offset;
return reloc;
}
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