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gnu / binutils-gdb / ecbf5d4f9b716c50908f62cbb9917ed42d45a254 / . / gas / config / tc-z8k.c
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/* tc-z8k.c -- Assemble code for the Zilog Z800n
Copyright (C) 1992-2021 Free Software Foundation, Inc.
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. */
/* Written By Steve Chamberlain <sac@cygnus.com>. */
#include "as.h"
#include "safe-ctype.h"
#define DEFINE_TABLE
#include "opcodes/z8k-opc.h"
const char comment_chars[] = "!";
const char line_comment_chars[] = "#";
const char line_separator_chars[] = ";";
extern int machine;
extern int coff_flags;
int segmented_mode;
/* This is non-zero if target was set from the command line.
If non-zero, 1 means Z8002 (non-segmented), 2 means Z8001 (segmented). */
static int z8k_target_from_cmdline;
static void
s_segm (int segm)
{
if (segm)
{
segmented_mode = 1;
bfd_set_arch_mach (stdoutput, TARGET_ARCH, bfd_mach_z8001);
}
else
{
segmented_mode = 0;
bfd_set_arch_mach (stdoutput, TARGET_ARCH, bfd_mach_z8002);
}
}
static void
even (int ignore ATTRIBUTE_UNUSED)
{
frag_align (1, 0, 0);
record_alignment (now_seg, 1);
}
static int
tohex (int c)
{
if (ISDIGIT (c))
return c - '0';
if (ISLOWER (c))
return c - 'a' + 10;
return c - 'A' + 10;
}
static void
sval (int ignore ATTRIBUTE_UNUSED)
{
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 ();
}
}
/* 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
*/
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 , 1},
{"z8002" , s_segm , 0},
{"segm" , s_segm , 1},
{"unsegm" , s_segm , 0},
{"unseg" , s_segm , 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";
/* Opcode mnemonics. */
static htab_t opcode_hash_control;
void
md_begin (void)
{
const opcode_entry_type *opcode;
unsigned int idx = -1u;
opcode_hash_control = str_htab_create ();
for (opcode = z8k_table; opcode->name; opcode++)
{
/* Only enter unique codes into the table. */
if (idx != opcode->idx)
str_hash_insert (opcode_hash_control, opcode->name, opcode, 0);
idx = opcode->idx;
}
/* Default to z8002. */
s_segm (z8k_target_from_cmdline ? z8k_target_from_cmdline - 1 : 0);
/* Insert the pseudo ops, too. */
for (idx = 0; md_pseudo_table[idx].poc_name; idx++)
{
opcode_entry_type *fake_opcode;
fake_opcode = XNEW (opcode_entry_type);
fake_opcode->name = md_pseudo_table[idx].poc_name;
fake_opcode->func = (void *) (md_pseudo_table + idx);
fake_opcode->opcode = 250;
str_hash_insert (opcode_hash_control, fake_opcode->name, fake_opcode, 0);
}
}
typedef struct z8k_op {
/* CLASS_REG_xxx. */
int regsize;
/* 0 .. 15. */
unsigned int reg;
int mode;
/* Any other register associated with the mode. */
unsigned int x_reg;
/* Any expression. */
expressionS exp;
} op_type;
static expressionS *da_operand;
static expressionS *imm_operand;
static int reg[16];
static int the_cc;
static int the_ctrl;
static int the_flags;
static int the_interrupt;
/* Determine register number. src points to the ascii number
(after "rl", "rh", "r", "rr", or "rq"). If a character
outside the set of {0,',',')','('} follows the number,
return NULL to indicate that it's not a valid register
number. */
static char *
whatreg (unsigned int *preg, char *src)
{
unsigned int new_reg;
/* src[0] is already known to be a digit. */
if (ISDIGIT (src[1]))
{
new_reg = (src[0] - '0') * 10 + src[1] - '0';
src += 2;
}
else
{
new_reg = (src[0] - '0');
src += 1;
}
if (src[0] != 0 && src[0] != ',' && src[0] != '(' && src[0] != ')')
return NULL;
*preg = new_reg;
return src;
}
/* 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 to parse a reg name. Return a pointer to the first character
in SRC after the reg name. */
static char *
parse_reg (char *src, int *mode, unsigned int *preg)
{
char *res = NULL;
char regno;
/* Check for stack pointer "sp" alias. */
if ((src[0] == 's' || src[0] == 'S')
&& (src[1] == 'p' || src[1] == 'P')
&& (src[2] == 0 || src[2] == ','))
{
if (segmented_mode)
{
*mode = CLASS_REG_LONG;
*preg = 14;
}
else
{
*mode = CLASS_REG_WORD;
*preg = 15;
}
return src + 2;
}
if (src[0] == 'r' || src[0] == 'R')
{
if (src[1] == 'r' || src[1] == 'R')
{
if (src[2] < '0' || src[2] > '9')
return NULL; /* Assume no register name but a label starting with 'rr'. */
*mode = CLASS_REG_LONG;
res = whatreg (preg, src + 2);
if (res == NULL)
return NULL; /* Not a valid register name. */
regno = *preg;
if (regno > 14)
as_bad (_("register rr%d out of range"), regno);
if (regno & 1)
as_bad (_("register rr%d does not exist"), regno);
}
else if (src[1] == 'h' || src[1] == 'H')
{
if (src[2] < '0' || src[2] > '9')
return NULL; /* Assume no register name but a label starting with 'rh'. */
*mode = CLASS_REG_BYTE;
res = whatreg (preg, src + 2);
if (res == NULL)
return NULL; /* Not a valid register name. */
regno = *preg;
if (regno > 7)
as_bad (_("register rh%d out of range"), regno);
}
else if (src[1] == 'l' || src[1] == 'L')
{
if (src[2] < '0' || src[2] > '9')
return NULL; /* Assume no register name but a label starting with 'rl'. */
*mode = CLASS_REG_BYTE;
res = whatreg (preg, src + 2);
if (res == NULL)
return NULL; /* Not a valid register name. */
regno = *preg;
if (regno > 7)
as_bad (_("register rl%d out of range"), regno);
*preg += 8;
}
else if (src[1] == 'q' || src[1] == 'Q')
{
if (src[2] < '0' || src[2] > '9')
return NULL; /* Assume no register name but a label starting with 'rq'. */
*mode = CLASS_REG_QUAD;
res = whatreg (preg, src + 2);
if (res == NULL)
return NULL; /* Not a valid register name. */
regno = *preg;
if (regno > 12)
as_bad (_("register rq%d out of range"), regno);
if (regno & 3)
as_bad (_("register rq%d does not exist"), regno);
}
else
{
if (src[1] < '0' || src[1] > '9')
return NULL; /* Assume no register name but a label starting with 'r'. */
*mode = CLASS_REG_WORD;
res = whatreg (preg, src + 1);
if (res == NULL)
return NULL; /* Not a valid register name. */
regno = *preg;
if (regno > 15)
as_bad (_("register r%d out of range"), regno);
}
}
return res;
}
static char *
parse_exp (char *s, expressionS *op)
{
char *save = input_line_pointer;
char *new_pointer;
input_line_pointer = s;
expression (op);
if (op->X_op == O_absent)
as_bad (_("missing operand"));
new_pointer = input_line_pointer;
input_line_pointer = save;
return new_pointer;
}
/* The many forms of operand:
<rb>
<r>
<rr>
<rq>
@r
#exp
exp
exp(r)
r(#exp)
r(r)
*/
static char *
checkfor (char *ptr, 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
regword (int mode, const 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
regaddr (int mode, const 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;
const char *name;
};
static struct ctrl_names ctrl_table[] = {
{ 0x1, "flags" }, /* ldctlb only. */
{ 0x2, "fcw" }, /* ldctl only. Applies to all remaining control registers. */
{ 0x3, "refresh" },
{ 0x4, "psapseg" },
{ 0x5, "psapoff" },
{ 0x5, "psap" },
{ 0x6, "nspseg" },
{ 0x7, "nspoff" },
{ 0x7, "nsp" },
{ 0 , 0 }
};
static void
get_ctrl_operand (char **ptr, struct z8k_op *mode, unsigned int dst ATTRIBUTE_UNUSED)
{
char *src = *ptr;
int i, l;
while (*src == ' ')
src++;
mode->mode = CLASS_CTRL;
for (i = 0; ctrl_table[i].name; i++)
{
l = strlen (ctrl_table[i].name);
if (! strncasecmp (ctrl_table[i].name, src, l))
{
the_ctrl = ctrl_table[i].value;
if (*(src + l) && *(src + l) != ',')
break;
*ptr = src + l; /* Valid control name found: "consume" it. */
return;
}
}
the_ctrl = 0;
}
struct flag_names {
int value;
const char *name;
};
static struct flag_names flag_table[] = {
{ 0x1, "P" },
{ 0x1, "V" },
{ 0x2, "S" },
{ 0x4, "Z" },
{ 0x8, "C" },
{ 0x0, "+" },
{ 0x0, "," },
{ 0, 0 }
};
static void
get_flags_operand (char **ptr, struct z8k_op *mode, unsigned int dst ATTRIBUTE_UNUSED)
{
char *src = *ptr;
char c;
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;
c = TOUPPER(src[j]);
for (i = 0; flag_table[i].name; i++)
{
if (flag_table[i].name[0] == c)
{
the_flags = the_flags | flag_table[i].value;
goto match;
}
}
goto done;
match:
;
}
done:
*ptr = src + j;
}
struct interrupt_names {
int value;
const char *name;
};
static struct interrupt_names intr_table[] = {
{ 0x1, "nvi" },
{ 0x2, "vi" },
{ 0x3, "both" },
{ 0x3, "all" },
{ 0, 0 }
};
static void
get_interrupt_operand (char **ptr, struct z8k_op *mode, unsigned int dst ATTRIBUTE_UNUSED)
{
char *src = *ptr;
int i, l;
while (*src == ' ')
src++;
mode->mode = CLASS_IMM;
the_interrupt = 0;
while (*src)
{
for (i = 0; intr_table[i].name; i++)
{
l = strlen (intr_table[i].name);
if (! strncasecmp (intr_table[i].name, src, l))
{
the_interrupt |= intr_table[i].value;
if (*(src + l) && *(src + l) != ',')
{
*ptr = src + l;
invalid:
as_bad (_("unknown interrupt %s"), src);
while (**ptr && ! is_end_of_line[(unsigned char) **ptr])
(*ptr)++; /* Consume rest of line. */
return;
}
src += l;
if (! *src)
{
*ptr = src;
return;
}
}
}
if (*src == ',')
src++;
else
{
*ptr = src;
goto invalid;
}
}
/* No interrupt type specified, opcode won't do anything. */
as_warn (_("opcode has no effect"));
the_interrupt = 0x0;
}
struct cc_names {
int value;
const char *name;
};
static struct cc_names table[] = {
{ 0x0, "f" },
{ 0x1, "lt" },
{ 0x2, "le" },
{ 0x3, "ule" },
{ 0x4, "ov/pe" },
{ 0x4, "ov" },
{ 0x4, "pe/ov" },
{ 0x4, "pe" },
{ 0x5, "mi" },
{ 0x6, "eq" },
{ 0x6, "z" },
{ 0x7, "c/ult" },
{ 0x7, "c" },
{ 0x7, "ult/c" },
{ 0x7, "ult" },
{ 0x8, "t" },
{ 0x9, "ge" },
{ 0xa, "gt" },
{ 0xb, "ugt" },
{ 0xc, "nov/po" },
{ 0xc, "nov" },
{ 0xc, "po/nov" },
{ 0xc, "po" },
{ 0xd, "pl" },
{ 0xe, "ne" },
{ 0xe, "nz" },
{ 0xf, "nc/uge" },
{ 0xf, "nc" },
{ 0xf, "uge/nc" },
{ 0xf, "uge" },
{ 0 , 0 }
};
static void
get_cc_operand (char **ptr, struct z8k_op *mode, unsigned int dst ATTRIBUTE_UNUSED)
{
char *src = *ptr;
int i, l;
while (*src == ' ')
src++;
mode->mode = CLASS_CC;
for (i = 0; table[i].name; i++)
{
l = strlen (table[i].name);
if (! strncasecmp (table[i].name, src, l))
{
the_cc = table[i].value;
if (*(src + l) && *(src + l) != ',')
break;
*ptr = src + l; /* Valid cc found: "consume" it. */
return;
}
}
the_cc = 0x8; /* Not recognizing the cc defaults to t. (Assuming no cc present.) */
}
static void
get_operand (char **ptr, struct z8k_op *mode, unsigned int dst ATTRIBUTE_UNUSED)
{
char *src = *ptr;
char *end;
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 == '@')
{
mode->mode = CLASS_IR;
src = parse_reg (src + 1, &mode->regsize, &mode->reg);
}
else
{
unsigned int regn;
end = parse_reg (src, &mode->mode, &regn);
if (end)
{
int nw;
unsigned int 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");
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 (const 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;
while (*ptr == ' ')
ptr++;
break;
case 1:
if (opcode->arg_info[0] == CLASS_CC)
{
get_cc_operand (&ptr, operand + 0, 0);
while (*ptr == ' ')
ptr++;
if (*ptr && ! is_end_of_line[(unsigned char) *ptr])
{
as_bad (_("invalid condition code '%s'"), ptr);
while (*ptr && ! is_end_of_line[(unsigned char) *ptr])
ptr++; /* Consume rest of line. */
}
}
else if (opcode->arg_info[0] == CLASS_FLAGS)
{
get_flags_operand (&ptr, operand + 0, 0);
while (*ptr == ' ')
ptr++;
if (*ptr && ! is_end_of_line[(unsigned char) *ptr])
{
as_bad (_("invalid flag '%s'"), ptr);
while (*ptr && ! is_end_of_line[(unsigned char) *ptr])
ptr++; /* Consume rest of line. */
}
}
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:
savptr = ptr;
if (opcode->arg_info[0] == CLASS_CC)
{
get_cc_operand (&ptr, operand + 0, 0);
while (*ptr == ' ')
ptr++;
if (*ptr != ',' && strchr (ptr + 1, ','))
{
savptr = ptr;
while (*ptr != ',')
ptr++;
*ptr = 0;
ptr++;
as_bad (_("invalid condition code '%s'"), savptr);
}
}
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 NULL;
if (*ptr == ',')
ptr++;
get_ctrl_operand (&ptr, operand + 1, 1);
if (the_ctrl == 0)
return NULL;
return ptr;
}
}
else
get_operand (&ptr, operand + 0, 0);
if (ptr == 0)
return NULL;
if (*ptr == ',')
ptr++;
get_operand (&ptr, operand + 1, 1);
break;
case 3:
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:
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 *
get_specific (opcode_entry_type *opcode, op_type *operands)
{
opcode_entry_type *this_try = opcode;
int found = 0;
unsigned int noperands = opcode->noperands;
unsigned int this_index = opcode->idx;
while (this_index == opcode->idx && !found)
{
unsigned int i;
this_try = opcode++;
for (i = 0; i < noperands; i++)
{
unsigned int mode = operands[i].mode;
if (((mode & CLASS_MASK) == CLASS_IR) && ((this_try->arg_info[i] & CLASS_MASK) == CLASS_IRO))
{
mode = operands[i].mode = (operands[i].mode & ~CLASS_MASK) | CLASS_IRO;
}
if ((mode & CLASS_MASK) != (this_try->arg_info[i] & CLASS_MASK))
{
/* It could be a 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_IRO:
if (operands[i].regsize != CLASS_REG_WORD)
as_bad (_("invalid indirect register size"));
reg[this_try->arg_info[i] & ARG_MASK] = operands[i].reg;
break;
case CLASS_IR:
if ((segmented_mode && operands[i].regsize != CLASS_REG_LONG)
|| (!segmented_mode && operands[i].regsize != CLASS_REG_WORD))
as_bad (_("invalid indirect register size"));
reg[this_try->arg_info[i] & ARG_MASK] = operands[i].reg;
break;
case CLASS_X:
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;
case CLASS_CTRL:
if (this_try->opcode == OPC_ldctlb && the_ctrl != 1)
as_bad (_("invalid control register name"));
break;
}
}
found = 1;
fail:
;
}
if (found)
return this_try;
else
return 0;
}
static unsigned char buffer[20];
static void
newfix (int ptr, bfd_reloc_code_real_type type, int size, expressionS *operand)
{
fixS *fixP;
/* Size is in nibbles. */
if (operand->X_add_symbol
|| operand->X_op_symbol
|| operand->X_add_number)
{
int is_pcrel;
switch(type)
{
case BFD_RELOC_8_PCREL:
case BFD_RELOC_Z8K_CALLR:
case BFD_RELOC_Z8K_DISP7:
is_pcrel = 1;
break;
default:
is_pcrel = 0;
break;
}
fixP = fix_new_exp (frag_now, ptr, size / 2,
operand, is_pcrel, type);
if (is_pcrel)
fixP->fx_no_overflow = 1;
}
}
static unsigned char *
apply_fix (unsigned char *ptr, bfd_reloc_code_real_type type,
expressionS *operand, int size)
{
long n = operand->X_add_number;
/* size is in nibbles. */
newfix ((ptr - buffer) / 2, type, size + 1, operand);
if (type == BFD_RELOC_Z8K_DISP7)
{
/* 2 nibbles, but most significant bit is part of the opcode == 7 bits. */
*ptr++ = (n >> 4) & 7;
*ptr++ = n >> 0;
}
else
{
switch (size)
{
case 8: /* 8 nibbles == 32 bits. */
*ptr++ = n >> 28;
*ptr++ = n >> 24;
*ptr++ = n >> 20;
*ptr++ = n >> 16;
/* Fall through. */
case 4: /* 4 nibbles == 16 bits. */
*ptr++ = n >> 12;
*ptr++ = n >> 8;
/* Fall through. */
case 2:
*ptr++ = n >> 4;
/* Fall through. */
case 1:
*ptr++ = n >> 0;
break;
}
}
return ptr;
}
/* Now we know what sort of opcodes it is. Let's build the bytes. */
static void
build_bytes (opcode_entry_type *this_try, struct z8k_op *operand ATTRIBUTE_UNUSED)
{
unsigned char *output_ptr = buffer;
int c;
int nibble;
unsigned int *class_ptr;
frag_wane (frag_now);
frag_new (0);
if (frag_room () < 8)
frag_grow (8); /* Make room for maximum instruction size. */
memset (buffer, 0, sizeof (buffer));
class_ptr = this_try->byte_info;
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; -- Now set at relocation time. */
output_ptr = apply_fix (output_ptr, BFD_RELOC_32, da_operand, 8);
}
else
{
output_ptr = apply_fix (output_ptr, BFD_RELOC_16, da_operand, 4);
}
da_operand = 0;
break;
case CLASS_DISP8:
/* pc rel 8 bit */
output_ptr = apply_fix (output_ptr, BFD_RELOC_8_PCREL, da_operand, 2);
da_operand = 0;
break;
case CLASS_0DISP7:
/* pc rel 7 bit */
*output_ptr = 0;
output_ptr = apply_fix (output_ptr, BFD_RELOC_Z8K_DISP7, da_operand, 2);
da_operand = 0;
break;
case CLASS_1DISP7:
/* pc rel 7 bit */
*output_ptr = 0x80;
output_ptr = apply_fix (output_ptr, BFD_RELOC_Z8K_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:
if (the_ctrl < 2 || the_ctrl > 7)
as_bad (_("invalid control register name"));
*output_ptr++ = the_ctrl;
break;
case CLASS_1CCC:
if (the_ctrl < 2 || the_ctrl > 7)
as_bad (_("invalid control register name"));
*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_IGNORE:
case CLASS_BIT:
*output_ptr++ = c & 0xf;
break;
case CLASS_REGN0:
if (reg[c & 0xf] == 0)
as_bad (_("can't use R0 here"));
/* Fall through. */
case CLASS_REG:
case CLASS_REG_BYTE:
case CLASS_REG_WORD:
case CLASS_REG_LONG:
case CLASS_REG_QUAD:
/* Insert bit pattern of right reg. */
*output_ptr++ = reg[c & 0xf];
break;
case CLASS_DISP:
switch (c & ARG_MASK)
{
case ARG_DISP12:
output_ptr = apply_fix (output_ptr, BFD_RELOC_Z8K_CALLR, da_operand, 4);
break;
case ARG_DISP16:
output_ptr = apply_fix (output_ptr, BFD_RELOC_16_PCREL, da_operand, 4);
break;
default:
output_ptr = apply_fix (output_ptr, BFD_RELOC_16, da_operand, 4);
}
da_operand = 0;
break;
case CLASS_IMM:
{
switch (c & ARG_MASK)
{
case ARG_NIM4:
if (imm_operand->X_add_number > 15)
as_bad (_("immediate value out of range"));
imm_operand->X_add_number = -imm_operand->X_add_number;
output_ptr = apply_fix (output_ptr, BFD_RELOC_Z8K_IMM4L, imm_operand, 1);
break;
/*case ARG_IMMNMINUS1: not used. */
case ARG_IMM4M1:
imm_operand->X_add_number--;
/* Fall through. */
case ARG_IMM4:
if (imm_operand->X_add_number > 15)
as_bad (_("immediate value out of range"));
output_ptr = apply_fix (output_ptr, BFD_RELOC_Z8K_IMM4L, imm_operand, 1);
break;
case ARG_NIM8:
imm_operand->X_add_number = -imm_operand->X_add_number;
/* Fall through. */
case ARG_IMM8:
output_ptr = apply_fix (output_ptr, BFD_RELOC_8, imm_operand, 2);
break;
case ARG_IMM16:
output_ptr = apply_fix (output_ptr, BFD_RELOC_16, imm_operand, 4);
break;
case ARG_IMM32:
output_ptr = apply_fix (output_ptr, BFD_RELOC_32, imm_operand, 8);
break;
default:
abort ();
}
}
}
}
/* Copy from the nibble buffer into the frag. */
{
int length = (output_ptr - buffer) / 2;
unsigned char *src = buffer;
unsigned char *fragp = (unsigned char *) frag_more (length);
while (src < output_ptr)
{
*fragp = ((src[0] & 0xf) << 4) | (src[1] & 0xf);
src += 2;
fragp++;
}
}
}
/* This is the guts of the machine-dependent assembler. STR points to a
machine dependent instruction. This function is supposed to emit
the frags/bytes it assembles to. */
void
md_assemble (char *str)
{
char c;
char *op_start;
char *op_end;
struct z8k_op operand[4];
opcode_entry_type *opcode;
/* Drop leading whitespace. */
while (*str == ' ')
str++;
/* Find the op code end. */
for (op_start = op_end = str;
*op_end != 0 && *op_end != ' ' && ! is_end_of_line[(unsigned char) *op_end];
op_end++)
;
if (op_end == op_start)
{
as_bad (_("can't find opcode "));
}
c = *op_end;
*op_end = 0; /* Zero-terminate op code string for str_hash_find() call. */
opcode = (opcode_entry_type *) str_hash_find (opcode_hash_control, op_start);
if (opcode == NULL)
{
as_bad (_("unknown opcode"));
return;
}
*op_end = c; /* Restore original string. */
if (opcode->opcode == 250)
{
pseudo_typeS *p;
char oc;
char *old = input_line_pointer;
/* Was really a pseudo op. */
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
{
char *new_input_line_pointer;
new_input_line_pointer = get_operands (opcode, op_end, operand);
if (new_input_line_pointer)
{
input_line_pointer = new_input_line_pointer;
opcode = get_specific (opcode, operand);
}
if (new_input_line_pointer == NULL || opcode == NULL)
{
/* 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);
}
}
/* We have no need to default values of symbols. */
symbolS *
md_undefined_symbol (char *name ATTRIBUTE_UNUSED)
{
return 0;
}
/* Various routines to kill one day. */
const char *
md_atof (int type, char *litP, int *sizeP)
{
return ieee_md_atof (type, litP, sizeP, true);
}
const char *md_shortopts = "z:";
struct option md_longopts[] =
{
#define OPTION_RELAX (OPTION_MD_BASE)
{"linkrelax", no_argument, NULL, OPTION_RELAX},
{NULL, no_argument, NULL, 0}
};
size_t md_longopts_size = sizeof (md_longopts);
int
md_parse_option (int c, const char *arg)
{
switch (c)
{
case 'z':
if (!strcmp (arg, "8001"))
z8k_target_from_cmdline = 2;
else if (!strcmp (arg, "8002"))
z8k_target_from_cmdline = 1;
else
{
as_bad (_("invalid architecture -z%s"), arg);
return 0;
}
break;
case OPTION_RELAX:
linkrelax = 1;
break;
default:
return 0;
}
return 1;
}
void
md_show_usage (FILE *stream)
{
fprintf (stream, _("\
Z8K options:\n\
-z8001 generate segmented code\n\
-z8002 generate unsegmented code\n\
-linkrelax create linker relaxable code\n"));
}
void
md_convert_frag (bfd *abfd ATTRIBUTE_UNUSED,
segT sec ATTRIBUTE_UNUSED,
fragS *fragP ATTRIBUTE_UNUSED)
{
printf (_("call to md_convert_frag\n"));
abort ();
}
/* Generate a machine dependent reloc from a fixup. */
arelent*
tc_gen_reloc (asection *section ATTRIBUTE_UNUSED,
fixS *fixp ATTRIBUTE_UNUSED)
{
arelent *reloc;
reloc = XNEW (arelent);
reloc->sym_ptr_ptr = XNEW (asymbol *);
*reloc->sym_ptr_ptr = symbol_get_bfdsym (fixp->fx_addsy);
reloc->address = fixp->fx_frag->fr_address + fixp->fx_where;
reloc->addend = fixp->fx_offset;
reloc->howto = bfd_reloc_type_lookup (stdoutput, fixp->fx_r_type);
if (! reloc->howto)
{
as_bad_where (fixp->fx_file, fixp->fx_line,
_("Cannot represent %s relocation in object file"),
bfd_get_reloc_code_name (fixp->fx_r_type));
abort ();
}
return reloc;
}
valueT
md_section_align (segT seg, valueT size)
{
int align = bfd_section_alignment (seg);
valueT mask = ((valueT) 1 << align) - 1;
return (size + mask) & ~mask;
}
/* Attempt to simplify or eliminate a fixup. To indicate that a fixup
has been eliminated, set fix->fx_done. If fix->fx_addsy is non-NULL,
we will have to generate a reloc entry. */
void
md_apply_fix (fixS *fixP, valueT *valP, segT segment ATTRIBUTE_UNUSED)
{
long val = * (long *) valP;
char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
switch (fixP->fx_r_type)
{
case BFD_RELOC_Z8K_IMM4L:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
buf[0] = (buf[0] & 0xf0) | (val & 0xf);
break;
case BFD_RELOC_8:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
*buf++ = val;
break;
case BFD_RELOC_16:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
*buf++ = (val >> 8);
*buf++ = val;
}
break;
case BFD_RELOC_32:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
*buf++ = (val >> 24);
*buf++ = (val >> 16);
*buf++ = (val >> 8);
*buf++ = val;
}
break;
case BFD_RELOC_8_PCREL:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
if (val & 1)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("cannot branch to odd address"));
val /= 2;
if (val > 127 || val < -128)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("relative jump out of range"));
*buf++ = val;
fixP->fx_no_overflow = 1;
fixP->fx_done = 1;
}
break;
case BFD_RELOC_16_PCREL:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
val = val - fixP->fx_frag->fr_address + fixP->fx_where - fixP->fx_size;
if (val > 32767 || val < -32768)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("relative address out of range"));
*buf++ = (val >> 8);
*buf++ = val;
fixP->fx_no_overflow = 1;
fixP->fx_done = 1;
}
break;
case BFD_RELOC_Z8K_CALLR:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
if (val & 1)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("cannot branch to odd address"));
if (val > 4096 || val < -4095)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("relative call out of range"));
val = -val / 2;
*buf = (*buf & 0xf0) | ((val >> 8) & 0xf);
buf++;
*buf++ = val & 0xff;
fixP->fx_no_overflow = 1;
fixP->fx_done = 1;
}
break;
case BFD_RELOC_Z8K_DISP7:
if (fixP->fx_addsy)
{
fixP->fx_no_overflow = 1;
fixP->fx_done = 0;
}
else
{
if (val & 1)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("cannot branch to odd address"));
val /= 2;
if (val > 0 || val < -127)
as_bad_where (fixP->fx_file, fixP->fx_line,
_("relative jump out of range"));
*buf = (*buf & 0x80) | (-val & 0x7f);
fixP->fx_no_overflow = 1;
fixP->fx_done = 1;
}
break;
default:
printf(_("md_apply_fix: unknown r_type 0x%x\n"), fixP->fx_r_type);
abort ();
}
if (fixP->fx_addsy == NULL && fixP->fx_pcrel == 0)
fixP->fx_done = 1;
}
int
md_estimate_size_before_relax (fragS *fragP ATTRIBUTE_UNUSED,
segT segment_type ATTRIBUTE_UNUSED)
{
printf (_("call to md_estimate_size_before_relax\n"));
abort ();
}
/* Put number into target byte order. */
void
md_number_to_chars (char *ptr, valueT use, int nbytes)
{
number_to_chars_bigendian (ptr, use, nbytes);
}
/* On the Z8000, a PC-relative offset is relative to the address of the
instruction plus its size. */
long
md_pcrel_from (fixS *fixP)
{
return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
}
void
tc_coff_symbol_emit_hook (symbolS *s ATTRIBUTE_UNUSED)
{
}