Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
b57ce6cde4
NetBSD/gnu/dist/gas/config/tc-z8k.c

1614 lines
30 KiB
C
Raw Normal View History

stock binutils-2.8
1997-09-24 19:39:15 +04:00
/* tc-z8k.c -- Assemble code for the Zilog Z800n
Copyright (C) 1992, 93, 94, 95, 96, 1997 Free Software Foundation.
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 2, 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, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
/*
Written By Steve Chamberlain
sac@cygnus.com
*/
#define DEFINE_TABLE
#include <stdio.h>
#include "opcodes/z8k-opc.h"
#include "as.h"
#include "bfd.h"
#include <ctype.h>
const char comment_chars[] =
{'!', 0};
const char line_separator_chars[] =
{';', 0};
const char line_comment_chars[] =
{'#', 0};
extern int machine;
extern int coff_flags;
int segmented_mode;
const int md_reloc_size;
/* This table describes all the machine specific pseudo-ops the assembler
has to support. The fields are:
pseudo-op name without dot
function to call to execute this pseudo-op
Integer arg to pass to the function
*/
void cons ();
void
s_segm ()
{
segmented_mode = 1;
machine = bfd_mach_z8001;
coff_flags = F_Z8001;
}
void
s_unseg ()
{
segmented_mode = 0;
machine = bfd_mach_z8002;
coff_flags = F_Z8002;
}
static
void
even ()
{
frag_align (1, 0, 0);
record_alignment (now_seg, 1);
}
void obj_coff_section ();
int
tohex (c)
int c;
{
if (isdigit (c))
return c - '0';
if (islower (c))
return c - 'a' + 10;
return c - 'A' + 10;
}
void
sval ()
{
SKIP_WHITESPACE ();
if (*input_line_pointer == '\'')
{
int c;
input_line_pointer++;
c = *input_line_pointer++;
while (c != '\'')
{
if (c == '%')
{
c = (tohex (input_line_pointer[0]) << 4)
| tohex (input_line_pointer[1]);
input_line_pointer += 2;
}
FRAG_APPEND_1_CHAR (c);
c = *input_line_pointer++;
}
demand_empty_rest_of_line ();
}
}
const pseudo_typeS md_pseudo_table[] =
{
{"int", cons, 2},
{"data.b", cons, 1},
{"data.w", cons, 2},
{"data.l", cons, 4},
{"form", listing_psize, 0},
{"heading", listing_title, 0},
{"import", s_ignore, 0},
{"page", listing_eject, 0},
{"program", s_ignore, 0},
{"z8001", s_segm, 0},
{"z8002", s_unseg, 0},
{"segm", s_segm, 0},
{"unsegm", s_unseg, 0},
{"unseg", s_unseg, 0},
{"name", s_app_file, 0},
{"global", s_globl, 0},
{"wval", cons, 2},
{"lval", cons, 4},
{"bval", cons, 1},
{"sval", sval, 0},
{"rsect", obj_coff_section, 0},
{"sect", obj_coff_section, 0},
{"block", s_space, 0},
{"even", even, 0},
{0, 0, 0}
};
const char EXP_CHARS[] = "eE";
/* Chars that mean this number is a floating point constant */
/* As in 0f12.456 */
/* or 0d1.2345e12 */
const char FLT_CHARS[] = "rRsSfFdDxXpP";
static struct hash_control *opcode_hash_control; /* Opcode mnemonics */
void
md_begin ()
{
opcode_entry_type *opcode;
char *prev_name = "";
int idx = 0;
opcode_hash_control = hash_new ();
for (opcode = z8k_table; opcode->name; opcode++)
{
/* Only enter unique codes into the table */
char *src = opcode->name;
if (strcmp (opcode->name, prev_name))
{
hash_insert (opcode_hash_control, opcode->name, (char *) opcode);
idx++;
}
opcode->idx = idx;
prev_name = opcode->name;
}
/* default to z8002 */
s_unseg ();
/* insert the pseudo ops too */
for (idx = 0; md_pseudo_table[idx].poc_name; idx++)
{
opcode_entry_type *fake_opcode;
fake_opcode = (opcode_entry_type *) malloc (sizeof (opcode_entry_type));
fake_opcode->name = md_pseudo_table[idx].poc_name,
fake_opcode->func = (void *) (md_pseudo_table + idx);
fake_opcode->opcode = 250;
hash_insert (opcode_hash_control, fake_opcode->name, fake_opcode);
}
linkrelax = 1;
}
struct z8k_exp
{
char *e_beg;
char *e_end;
expressionS e_exp;
};
typedef struct z8k_op
{
char regsize; /* 'b','w','r','q' */
unsigned int reg; /* 0..15 */
int mode;
unsigned int x_reg; /* any other register associated with the mode */
expressionS exp; /* any expression */
}
op_type;
static expressionS *da_operand;
static expressionS *imm_operand;
int reg[16];
int the_cc;
int the_ctrl;
int the_flags;
int the_interrupt;
char *
DEFUN (whatreg, (reg, src),
int *reg AND
char *src)
{
if (isdigit (src[1]))
{
*reg = (src[0] - '0') * 10 + src[1] - '0';
return src + 2;
}
else
{
*reg = (src[0] - '0');
return src + 1;
}
}
/*
parse operands
rh0-rh7, rl0-rl7
r0-r15
rr0-rr14
rq0--rq12
WREG r0,r1,r2,r3,r4,r5,r6,r7,fp,sp
r0l,r0h,..r7l,r7h
@WREG
@WREG+
@-WREG
#const
*/
/* try and parse a reg name, returns number of chars consumed */
char *
DEFUN (parse_reg, (src, mode, reg),
char *src AND
int *mode AND
unsigned int *reg)
{
char *res = 0;
char regno;
if (src[0] == 's' && src[1] == 'p')
{
if (segmented_mode)
{
*mode = CLASS_REG_LONG;
*reg = 14;
}
else
{
*mode = CLASS_REG_WORD;
*reg = 15;
}
return src + 2;
}
if (src[0] == 'r')
{
if (src[1] == 'r')
{
*mode = CLASS_REG_LONG;
res = whatreg (reg, src + 2);
regno = *reg;
if (regno > 14)
as_warn ("register rr%d, out of range.",regno);
}
else if (src[1] == 'h')
{
*mode = CLASS_REG_BYTE;
res = whatreg (reg, src + 2);
regno = *reg;
if (regno > 7)
as_warn ("register rh%d, out of range.",regno);
}
else if (src[1] == 'l')
{
*mode = CLASS_REG_BYTE;
res = whatreg (reg, src + 2);
regno = *reg;
if (regno > 7)
as_warn ("register rl%d, out of range.",regno);
*reg += 8;
}
else if (src[1] == 'q')
{
*mode = CLASS_REG_QUAD;
res = whatreg (reg, src + 2);
regno = *reg;
if (regno > 12)
as_warn ("register rq%d, out of range.",regno);
}
else
{
*mode = CLASS_REG_WORD;
res = whatreg (reg, src + 1);
regno = *reg;
if (regno > 15)
as_warn ("register r%d, out of range.",regno);
}
}
return res;
}
char *
DEFUN (parse_exp, (s, op),
char *s AND
expressionS * op)
{
char *save = input_line_pointer;
char *new;
input_line_pointer = s;
expression (op);
if (op->X_op == O_absent)
as_bad ("missing operand");
new = input_line_pointer;
input_line_pointer = save;
return new;
}
/* The many forms of operand:
<rb>
<r>
<rr>
<rq>
@r
#exp
exp
exp(r)
r(#exp)
r(r)
*/
static
char *
DEFUN (checkfor, (ptr, what),
char *ptr AND
char what)
{
if (*ptr == what)
ptr++;
else
{
as_bad ("expected %c", what);
}
return ptr;
}
/* Make sure the mode supplied is the size of a word */
static void
DEFUN (regword, (mode, string),
int mode AND
char *string)
{
int ok;
ok = CLASS_REG_WORD;
if (ok != mode)
{
as_bad ("register is wrong size for a word %s", string);
}
}
/* Make sure the mode supplied is the size of an address */
static void
DEFUN (regaddr, (mode, string),
int mode AND
char *string)
{
int ok;
ok = segmented_mode ? CLASS_REG_LONG : CLASS_REG_WORD;
if (ok != mode)
{
as_bad ("register is wrong size for address %s", string);
}
}
struct ctrl_names
{
int value;
char *name;
};
struct ctrl_names ctrl_table[] =
{
0x2, "fcw",
0X3, "refresh",
0x4, "psapseg",
0x5, "psapoff",
0x5, "psap",
0x6, "nspseg",
0x7, "nspoff",
0x7, "nsp",
0, 0
};
static void
DEFUN (get_ctrl_operand, (ptr, mode, dst),
char **ptr AND
struct z8k_op *mode AND
unsigned int dst)
{
char *src = *ptr;
int r;
int i;
while (*src == ' ')
src++;
mode->mode = CLASS_CTRL;
for (i = 0; ctrl_table[i].name; i++)
{
int j;
for (j = 0; ctrl_table[i].name[j]; j++)
{
if (ctrl_table[i].name[j] != src[j])
goto fail;
}
the_ctrl = ctrl_table[i].value;
*ptr = src + j;
return;
fail:;
}
the_ctrl = 0;
return;
}
struct flag_names
{
int value;
char *name;
};
struct flag_names flag_table[] =
{
0x1, "p",
0x1, "v",
0x2, "s",
0x4, "z",
0x8, "c",
0x0, "+",
0, 0
};
static void
DEFUN (get_flags_operand, (ptr, mode, dst),
char **ptr AND
struct z8k_op *mode AND
unsigned int dst)
{
char *src = *ptr;
int r;
int i;
int j;
while (*src == ' ')
src++;
mode->mode = CLASS_FLAGS;
the_flags = 0;
for (j = 0; j <= 9; j++)
{
if (!src[j])
goto done;
for (i = 0; flag_table[i].name; i++)
{
if (flag_table[i].name[0] == src[j])
{
the_flags = the_flags | flag_table[i].value;
goto match;
}
}
goto done;
match:
;
}
done:
*ptr = src + j;
return;
}
struct interrupt_names
{
int value;
char *name;
};
struct interrupt_names intr_table[] =
{
0x1, "nvi",
0x2, "vi",
0x3, "both",
0x3, "all",
0, 0
};
static void
DEFUN (get_interrupt_operand, (ptr, mode, dst),
char **ptr AND
struct z8k_op *mode AND
unsigned int dst)
{
char *src = *ptr;
int r;
int i;
while (*src == ' ')
src++;
mode->mode = CLASS_IMM;
for (i = 0; intr_table[i].name; i++)
{
int j;
for (j = 0; intr_table[i].name[j]; j++)
{
if (intr_table[i].name[j] != src[j])
goto fail;
}
the_interrupt = intr_table[i].value;
*ptr = src + j;
return;
fail:;
}
the_interrupt = 0x0;
return;
}
struct cc_names
{
int value;
char *name;
};
struct cc_names table[] =
{
0x0, "f",
0x1, "lt",
0x2, "le",
0x3, "ule",
0x4, "ov",
0x4, "pe",
0x5, "mi",
0x6, "eq",
0x6, "z",
0x7, "c",
0x7, "ult",
0x8, "t",
0x9, "ge",
0xa, "gt",
0xb, "ugt",
0xc, "nov",
0xc, "po",
0xd, "pl",
0xe, "ne",
0xe, "nz",
0xf, "nc",
0xf, "uge",
0, 0
};
static void
DEFUN (get_cc_operand, (ptr, mode, dst),
char **ptr AND
struct z8k_op *mode AND
unsigned int dst)
{
char *src = *ptr;
int r;
int i;
while (*src == ' ')
src++;
mode->mode = CLASS_CC;
for (i = 0; table[i].name; i++)
{
int j;
for (j = 0; table[i].name[j]; j++)
{
if (table[i].name[j] != src[j])
goto fail;
}
the_cc = table[i].value;
*ptr = src + j;
return;
fail:;
}
the_cc = 0x8;
}
static void
get_operand (ptr, mode, dst)
char **ptr;
struct z8k_op *mode;
unsigned int dst;
{
char *src = *ptr;
char *end;
unsigned int num;
unsigned int len;
unsigned int size;
mode->mode = 0;
while (*src == ' ')
src++;
if (*src == '#')
{
mode->mode = CLASS_IMM;
imm_operand = &(mode->exp);
src = parse_exp (src + 1, &(mode->exp));
}
else if (*src == '@')
{
int d;
mode->mode = CLASS_IR;
src = parse_reg (src + 1, &d, &mode->reg);
}
else
{
int regn;
end = parse_reg (src, &mode->mode, &regn);
if (end)
{
int nw, nr;
src = end;
if (*src == '(')
{
src++;
end = parse_reg (src, &nw, &nr);
if (end)
{
/* Got Ra(Rb) */
src = end;
if (*src != ')')
{
as_bad ("Missing ) in ra(rb)");
}
else
{
src++;
}
regaddr (mode->mode, "ra(rb) ra");
/* regword (mode->mode, "ra(rb) rb");*/
mode->mode = CLASS_BX;
mode->reg = regn;
mode->x_reg = nr;
reg[ARG_RX] = nr;
}
else
{
/* Got Ra(disp) */
if (*src == '#')
src++;
src = parse_exp (src, &(mode->exp));
src = checkfor (src, ')');
mode->mode = CLASS_BA;
mode->reg = regn;
mode->x_reg = 0;
imm_operand = &(mode->exp);
}
}
else
{
mode->reg = regn;
mode->x_reg = 0;
}
}
else
{
/* No initial reg */
src = parse_exp (src, &(mode->exp));
if (*src == '(')
{
src++;
end = parse_reg (src, &(mode->mode), &regn);
regword (mode->mode, "addr(Ra) ra");
mode->mode = CLASS_X;
mode->reg = regn;
mode->x_reg = 0;
da_operand = &(mode->exp);
src = checkfor (end, ')');
}
else
{
/* Just an address */
mode->mode = CLASS_DA;
mode->reg = 0;
mode->x_reg = 0;
da_operand = &(mode->exp);
}
}
}
*ptr = src;
}
static
char *
get_operands (opcode, op_end, operand)
opcode_entry_type *opcode;
char *op_end;
op_type *operand;
{
char *ptr = op_end;
char *savptr;
switch (opcode->noperands)
{
case 0:
operand[0].mode = 0;
operand[1].mode = 0;
break;
case 1:
ptr++;
if (opcode->arg_info[0] == CLASS_CC)
{
get_cc_operand (&ptr, operand + 0, 0);
}
else if (opcode->arg_info[0] == CLASS_FLAGS)
{
get_flags_operand (&ptr, operand + 0, 0);
}
else if (opcode->arg_info[0] == (CLASS_IMM +(ARG_IMM2)))
{
get_interrupt_operand (&ptr, operand + 0, 0);
}
else
{
get_operand (&ptr, operand + 0, 0);
}
operand[1].mode = 0;
break;
case 2:
ptr++;
savptr = ptr;
if (opcode->arg_info[0] == CLASS_CC)
{
get_cc_operand (&ptr, operand + 0, 0);
}
else if (opcode->arg_info[0] == CLASS_CTRL)
{
get_ctrl_operand (&ptr, operand + 0, 0);
if (the_ctrl == 0)
{
ptr = savptr;
get_operand (&ptr, operand + 0, 0);
if (ptr == 0)
return;
if (*ptr == ',')
ptr++;
get_ctrl_operand (&ptr, operand + 1, 1);
return ptr;
}
}
else
{
get_operand (&ptr, operand + 0, 0);
}
if (ptr == 0)
return;
if (*ptr == ',')
ptr++;
get_operand (&ptr, operand + 1, 1);
break;
case 3:
ptr++;
get_operand (&ptr, operand + 0, 0);
if (*ptr == ',')
ptr++;
get_operand (&ptr, operand + 1, 1);
if (*ptr == ',')
ptr++;
get_operand (&ptr, operand + 2, 2);
break;
case 4:
ptr++;
get_operand (&ptr, operand + 0, 0);
if (*ptr == ',')
ptr++;
get_operand (&ptr, operand + 1, 1);
if (*ptr == ',')
ptr++;
get_operand (&ptr, operand + 2, 2);
if (*ptr == ',')
ptr++;
get_cc_operand (&ptr, operand + 3, 3);
break;
default:
abort ();
}
return ptr;
}
/* Passed a pointer to a list of opcodes which use different
addressing modes, return the opcode which matches the opcodes
provided
*/
static
opcode_entry_type *
DEFUN (get_specific, (opcode, operands),
opcode_entry_type * opcode AND
op_type * operands)
{
opcode_entry_type *this_try = opcode;
int found = 0;
unsigned int noperands = opcode->noperands;
unsigned int dispreg;
unsigned int this_index = opcode->idx;
while (this_index == opcode->idx && !found)
{
unsigned int i;
this_try = opcode++;
for (i = 0; i < noperands; i++)
{
int mode = operands[i].mode;
if ((mode & CLASS_MASK) != (this_try->arg_info[i] & CLASS_MASK))
{
/* it could be an pc rel operand, if this is a da mode and
we like disps, then insert it */
if (mode == CLASS_DA && this_try->arg_info[i] == CLASS_DISP)
{
/* This is the case */
operands[i].mode = CLASS_DISP;
}
else if (mode == CLASS_BA && this_try->arg_info[i])
{
/* Can't think of a way to turn what we've been given into
something that's ok */
goto fail;
}
else if (this_try->arg_info[i] & CLASS_PR)
{
if (mode == CLASS_REG_LONG && segmented_mode)
{
/* ok */
}
else if (mode == CLASS_REG_WORD && !segmented_mode)
{
/* ok */
}
else
goto fail;
}
else
goto fail;
}
switch (mode & CLASS_MASK)
{
default:
break;
case CLASS_X:
case CLASS_IR:
case CLASS_BA:
case CLASS_BX:
case CLASS_DISP:
case CLASS_REG:
case CLASS_REG_WORD:
case CLASS_REG_BYTE:
case CLASS_REG_QUAD:
case CLASS_REG_LONG:
case CLASS_REGN0:
reg[this_try->arg_info[i] & ARG_MASK] = operands[i].reg;
break;
}
}
found = 1;
fail:;
}
if (found)
return this_try;
else
return 0;
}
static void
DEFUN (check_operand, (operand, width, string),
struct z8k_op *operand AND
unsigned int width AND
char *string)
{
if (operand->exp.X_add_symbol == 0
&& operand->exp.X_op_symbol == 0)
{
/* No symbol involved, let's look at offset, it's dangerous if any of
the high bits are not 0 or ff's, find out by oring or anding with
the width and seeing if the answer is 0 or all fs*/
if ((operand->exp.X_add_number & ~width) != 0 &&
(operand->exp.X_add_number | width) != (~0))
{
as_warn ("operand %s0x%x out of range.", string, operand->exp.X_add_number);
}
}
}
static char buffer[20];
static void
DEFUN (newfix, (ptr, type, operand),
int ptr AND
int type AND
expressionS * operand)
{
if (operand->X_add_symbol
|| operand->X_op_symbol
|| operand->X_add_number)
{
fix_new_exp (frag_now,
ptr,
1,
operand,
0,
type);
}
}
static char *
DEFUN (apply_fix, (ptr, type, operand, size),
char *ptr AND
int type AND
expressionS * operand AND
int size)
{
int n = operand->X_add_number;
operand->X_add_number = n;
newfix ((ptr - buffer) / 2, type, operand);
#if 1
switch (size)
{
case 8: /* 8 nibbles == 32 bits */
*ptr++ = n >> 28;
*ptr++ = n >> 24;
*ptr++ = n >> 20;
*ptr++ = n >> 16;
case 4: /* 4 niblles == 16 bits */
*ptr++ = n >> 12;
*ptr++ = n >> 8;
case 2:
*ptr++ = n >> 4;
case 1:
*ptr++ = n >> 0;
break;
}
#endif
return ptr;
}
/* Now we know what sort of opcodes it is, lets build the bytes -
*/
#define INSERT(x,y) *x++ = y>>24; *x++ = y>> 16; *x++=y>>8; *x++ =y;
static void
build_bytes (this_try, operand)
opcode_entry_type * this_try;
struct z8k_op *operand;
{
unsigned int i;
int length;
char *output;
char *output_ptr = buffer;
char part;
int c;
char high;
int nib;
int nibble;
unsigned int *class_ptr;
frag_wane (frag_now);
frag_new (0);
memset (buffer, 20, 0);
class_ptr = this_try->byte_info;
top:;
for (nibble = 0; c = *class_ptr++; nibble++)
{
switch (c & CLASS_MASK)
{
default:
abort ();
case CLASS_ADDRESS:
/* Direct address, we don't cope with the SS mode right now */
if (segmented_mode)
{
da_operand->X_add_number |= 0x80000000;
output_ptr = apply_fix (output_ptr, R_IMM32, da_operand, 8);
}
else
{
output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
}
da_operand = 0;
break;
case CLASS_DISP8:
/* pc rel 8 bit */
output_ptr = apply_fix (output_ptr, R_JR, da_operand, 2);
da_operand = 0;
break;
case CLASS_0DISP7:
/* pc rel 7 bit */
*output_ptr = 0;
output_ptr = apply_fix (output_ptr, R_DISP7, da_operand, 2);
da_operand = 0;
break;
case CLASS_1DISP7:
/* pc rel 7 bit */
*output_ptr = 0x80;
output_ptr = apply_fix (output_ptr, R_DISP7, da_operand, 2);
output_ptr[-2] = 0x8;
da_operand = 0;
break;
case CLASS_BIT_1OR2:
*output_ptr = c & 0xf;
if (imm_operand)
{
if (imm_operand->X_add_number == 2)
{
*output_ptr |= 2;
}
else if (imm_operand->X_add_number != 1)
{
as_bad ("immediate must be 1 or 2");
}
}
else
{
as_bad ("immediate 1 or 2 expected");
}
output_ptr++;
break;
case CLASS_CC:
*output_ptr++ = the_cc;
break;
case CLASS_0CCC:
*output_ptr++ = the_ctrl;
break;
case CLASS_1CCC:
*output_ptr++ = the_ctrl | 0x8;
break;
case CLASS_00II:
*output_ptr++ = (~the_interrupt & 0x3);
break;
case CLASS_01II:
*output_ptr++ = (~the_interrupt & 0x3) | 0x4;
break;
case CLASS_FLAGS:
*output_ptr++ = the_flags;
break;
case CLASS_BIT:
*output_ptr++ = c & 0xf;
break;
case CLASS_REGN0:
if (reg[c & 0xf] == 0)
{
as_bad ("can't use R0 here");
}
case CLASS_REG:
case CLASS_REG_BYTE:
case CLASS_REG_WORD:
case CLASS_REG_LONG:
case CLASS_REG_QUAD:
/* Insert bit mattern of
right reg */
*output_ptr++ = reg[c & 0xf];
break;
case CLASS_DISP:
output_ptr = apply_fix (output_ptr, R_IMM16, da_operand, 4);
da_operand = 0;
break;
case CLASS_IMM:
{
nib = 0;
switch (c & ARG_MASK)
{
case ARG_IMM4:
output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
break;
case ARG_IMM4M1:
imm_operand->X_add_number--;
output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
break;
case ARG_IMMNMINUS1:
imm_operand->X_add_number--;
output_ptr = apply_fix (output_ptr, R_IMM4L, imm_operand, 1);
break;
case ARG_NIM8:
imm_operand->X_add_number = -imm_operand->X_add_number;
case ARG_IMM8:
output_ptr = apply_fix (output_ptr, R_IMM8, imm_operand, 2);
break;
case ARG_IMM16:
output_ptr = apply_fix (output_ptr, R_IMM16, imm_operand, 4);
break;
case ARG_IMM32:
output_ptr = apply_fix (output_ptr, R_IMM32, imm_operand, 8);
break;
default:
abort ();
}
}
}
}
/* Copy from the nibble buffer into the frag */
{
int length = (output_ptr - buffer) / 2;
char *src = buffer;
char *fragp = frag_more (length);
while (src < output_ptr)
{
*fragp = (src[0] << 4) | src[1];
src += 2;
fragp++;
}
}
}
/* This is the guts of the machine-dependent assembler. STR points to a
machine dependent instruction. This funciton is supposed to emit
the frags/bytes it assembles to.
*/
void
DEFUN (md_assemble, (str),
char *str)
{
char *op_start;
char *op_end;
unsigned int i;
struct z8k_op operand[3];
opcode_entry_type *opcode;
opcode_entry_type *prev_opcode;
char *dot = 0;
char c;
/* Drop leading whitespace */
while (*str == ' ')
str++;
/* find the op code end */
for (op_start = op_end = str;
*op_end != 0 && *op_end != ' ';
op_end++)
{
}
;
if (op_end == op_start)
{
as_bad ("can't find opcode ");
}
c = *op_end;
*op_end = 0;
opcode = (opcode_entry_type *) hash_find (opcode_hash_control,
op_start);
if (opcode == NULL)
{
as_bad ("unknown opcode");
return;
}
if (opcode->opcode == 250)
{
/* was really a pseudo op */
pseudo_typeS *p;
char oc;
char *old = input_line_pointer;
*op_end = c;
input_line_pointer = op_end;
oc = *old;
*old = '\n';
while (*input_line_pointer == ' ')
input_line_pointer++;
p = (pseudo_typeS *) (opcode->func);
(p->poc_handler) (p->poc_val);
input_line_pointer = old;
*old = oc;
}
else
{
input_line_pointer = get_operands (opcode, op_end,
operand);
prev_opcode = opcode;
opcode = get_specific (opcode, operand);
if (opcode == 0)
{
/* Couldn't find an opcode which matched the operands */
char *where = frag_more (2);
where[0] = 0x0;
where[1] = 0x0;
as_bad ("Can't find opcode to match operands");
return;
}
build_bytes (opcode, operand);
}
}
void
DEFUN (tc_crawl_symbol_chain, (headers),
object_headers * headers)
{
printf ("call to tc_crawl_symbol_chain \n");
}
symbolS *
DEFUN (md_undefined_symbol, (name),
char *name)
{
return 0;
}
void
DEFUN (tc_headers_hook, (headers),
object_headers * headers)
{
printf ("call to tc_headers_hook \n");
}
/* Various routines to kill one day */
/* Equal to MAX_PRECISION in atof-ieee.c */
#define MAX_LITTLENUMS 6
/* Turn a string in input_line_pointer into a floating point constant of type
type, and store the appropriate bytes in *litP. The number of LITTLENUMS
emitted is stored in *sizeP . An error message is returned, or NULL on OK.
*/
char *
md_atof (type, litP, sizeP)
char type;
char *litP;
int *sizeP;
{
int prec;
LITTLENUM_TYPE words[MAX_LITTLENUMS];
LITTLENUM_TYPE *wordP;
char *t;
char *atof_ieee ();
switch (type)
{
case 'f':
case 'F':
case 's':
case 'S':
prec = 2;
break;
case 'd':
case 'D':
case 'r':
case 'R':
prec = 4;
break;
case 'x':
case 'X':
prec = 6;
break;
case 'p':
case 'P':
prec = 6;
break;
default:
*sizeP = 0;
return "Bad call to MD_ATOF()";
}
t = atof_ieee (input_line_pointer, type, words);
if (t)
input_line_pointer = t;
*sizeP = prec * sizeof (LITTLENUM_TYPE);
for (wordP = words; prec--;)
{
md_number_to_chars (litP, (long) (*wordP++), sizeof (LITTLENUM_TYPE));
litP += sizeof (LITTLENUM_TYPE);
}
return 0;
}
CONST char *md_shortopts = "z:";
struct option md_longopts[] = {
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof(md_longopts);
int
md_parse_option (c, arg)
int c;
char *arg;
{
switch (c)
{
case 'z':
if (!strcmp (arg, "8001"))
s_segm ();
else if (!strcmp (arg, "8002"))
s_unseg ();
else
{
as_bad ("invalid architecture -z%s", arg);
return 0;
}
break;
default:
return 0;
}
return 1;
}
void
md_show_usage (stream)
FILE *stream;
{
fprintf(stream, "\
Z8K options:\n\
-z8001 generate segmented code\n\
-z8002 generate unsegmented code\n");
}
int md_short_jump_size;
void
tc_aout_fix_to_chars ()
{
printf ("call to tc_aout_fix_to_chars \n");
abort ();
}
void
md_create_short_jump (ptr, from_addr, to_addr, frag, to_symbol)
char *ptr;
addressT from_addr;
addressT to_addr;
fragS *frag;
symbolS *to_symbol;
{
as_fatal ("failed sanity check.");
}
void
md_create_long_jump (ptr, from_addr, to_addr, frag, to_symbol)
char *ptr;
addressT from_addr, to_addr;
fragS *frag;
symbolS *to_symbol;
{
as_fatal ("failed sanity check.");
}
void
md_convert_frag (headers, seg, fragP)
object_headers *headers;
segT seg;
fragS *fragP;
{
printf ("call to md_convert_frag \n");
abort ();
}
valueT
DEFUN (md_section_align, (seg, size),
segT seg AND
valueT size)
{
return ((size + (1 << section_alignment[(int) seg]) - 1) & (-1 << section_alignment[(int) seg]));
}
void
md_apply_fix (fixP, val)
fixS *fixP;
long val;
{
char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
switch (fixP->fx_r_type)
{
case R_IMM4L:
buf[0] = (buf[0] & 0xf0) | ((buf[0] + val) & 0xf);
break;
case R_JR:
*buf++ = val;
/* if (val != 0) abort();*/
break;
case R_DISP7:
*buf++ += val;
/* if (val != 0) abort();*/
break;
case R_IMM8:
buf[0] += val;
break;
case R_IMM16:
*buf++ = (val >> 8);
*buf++ = val;
break;
case R_IMM32:
*buf++ = (val >> 24);
*buf++ = (val >> 16);
*buf++ = (val >> 8);
*buf++ = val;
break;
#if 0
case R_DA | R_SEG:
*buf++ = (val >> 16);
*buf++ = 0x00;
*buf++ = (val >> 8);
*buf++ = val;
break;
#endif
case 0:
md_number_to_chars (buf, val, fixP->fx_size);
break;
default:
abort ();
}
}
int md_long_jump_size;
int
md_estimate_size_before_relax (fragP, segment_type)
register fragS *fragP;
register segT segment_type;
{
printf ("call tomd_estimate_size_before_relax \n");
abort ();
}
/* Put number into target byte order */
void
DEFUN (md_number_to_chars, (ptr, use, nbytes),
char *ptr AND
valueT use AND
int nbytes)
{
number_to_chars_bigendian (ptr, use, nbytes);
}
long
md_pcrel_from (fixP)
fixS *fixP;
{
abort ();
}
void
tc_coff_symbol_emit_hook (s)
struct symbol *s;
{
}
void
tc_reloc_mangle (fix_ptr, intr, base)
fixS *fix_ptr;
struct internal_reloc *intr;
bfd_vma base;
{
symbolS *symbol_ptr;
if (fix_ptr->fx_addsy &&
fix_ptr->fx_subsy)
{
symbolS *add = fix_ptr->fx_addsy;
symbolS *sub = fix_ptr->fx_subsy;
if (S_GET_SEGMENT(add) != S_GET_SEGMENT(sub))
{
as_bad("Can't subtract symbols in different sections %s %s",
S_GET_NAME(add), S_GET_NAME(sub));
}
else {
int diff = S_GET_VALUE(add) - S_GET_VALUE(sub);
fix_ptr->fx_addsy = 0;
fix_ptr->fx_subsy = 0;
fix_ptr->fx_offset += diff;
}
}
symbol_ptr = fix_ptr->fx_addsy;
/* If this relocation is attached to a symbol then it's ok
to output it */
if (fix_ptr->fx_r_type == 0)
{
/* cons likes to create reloc32's whatever the size of the reloc.. */
switch (fix_ptr->fx_size)
{
case 2:
intr->r_type = R_IMM16;
break;
case 1:
intr->r_type = R_IMM8;
break;
case 4:
intr->r_type = R_IMM32;
break;
default:
abort ();
}
}
else
{
intr->r_type = fix_ptr->fx_r_type;
}
intr->r_vaddr = fix_ptr->fx_frag->fr_address + fix_ptr->fx_where + base;
intr->r_offset = fix_ptr->fx_offset;
if (symbol_ptr)
intr->r_symndx = symbol_ptr->sy_number;
else
intr->r_symndx = -1;
}
Reference in New Issue Copy Permalink