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old-cross-binutils/gas/config/tc-m68k.c
K. Richard Pixley fecd2382e7 Initial revision
1991-04-04 18:19:53 +00:00

3808 lines
89 KiB
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/* m68k.c All the m68020 specific stuff in one convenient, huge,
slow to compile, easy to find file.
Copyright (C) 1987, 1991 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <ctype.h>
#include "as.h"
#include "obstack.h"
/* note that this file includes real declarations and thus can only be included by one source file per executable. */
#include "m68k-opcode.h"
/* This array holds the chars that always start a comment. If the
pre-processor is disabled, these aren't very useful */
const char comment_chars[] = "|";
/* This array holds the chars that only start a comment at the beginning of
a line. If the line seems to have the form '# 123 filename'
.line and .file directives will appear in the pre-processed output */
/* Note that input_file.c hand checks for '#' at the beginning of the
first line of the input file. This is because the compiler outputs
#NO_APP at the beginning of its output. */
/* Also note that comments like this one will always work. */
const char line_comment_chars[] = "#";
/* Chars that can be used to separate mant from exp in floating point nums */
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[] = "rRsSfFdDxXeEpP";
/* Also be aware that MAXIMUM_NUMBER_OF_CHARS_FOR_FLOAT may have to be
changed in read.c . Ideally it shouldn't have to know about it at all,
but nothing is ideal around here.
*/
int md_reloc_size = 8; /* Size of relocation record */
/* Its an arbitrary name: This means I don't approve of it */
/* See flames below */
static struct obstack robyn;
#define TAB(x,y) (((x)<<2)+(y))
#define TABTYPE(xy) ((xy) >> 2)
#define BYTE 0
#define SHORT 1
#define LONG 2
#define SZ_UNDEF 3
#define BRANCH 1
#define FBRANCH 2
#define PCREL 3
#define BCC68000 4
#define DBCC 5
#define PCLEA 6
struct m68k_exp {
char *e_beg;
char *e_end;
expressionS e_exp;
short e_siz; /* 0== default 1==short/byte 2==word 3==long */
};
/* Internal form of an operand. */
struct m68k_op {
char *error; /* Couldn't parse it */
int mode; /* What mode this instruction is in. */
unsigned long reg; /* Base register */
struct m68k_exp *con1;
int ireg; /* Index register */
int isiz; /* 0==unspec 1==byte(?) 2==short 3==long */
int imul; /* Multipy ireg by this (1,2,4,or 8) */
struct m68k_exp *con2;
};
/* internal form of a 68020 instruction */
struct m68_it {
char *error;
char *args; /* list of opcode info */
int numargs;
int numo; /* Number of shorts in opcode */
short opcode[11];
struct m68k_op operands[6];
int nexp; /* number of exprs in use */
struct m68k_exp exprs[4];
int nfrag; /* Number of frags we have to produce */
struct {
int fragoff; /* Where in the current opcode[] the frag ends */
symbolS *fadd;
long foff;
int fragty;
} fragb[4];
int nrel; /* Num of reloc strucs in use */
struct {
int n;
symbolS *add,
*sub;
long off;
char wid;
char pcrel;
} reloc[5]; /* Five is enough??? */
};
struct m68_it the_ins; /* the instruction being assembled */
/* Macros for adding things to the m68_it struct */
#define addword(w) the_ins.opcode[the_ins.numo++]=(w)
/* Like addword, but goes BEFORE general operands */
#define insop(w) {int z;\
for(z=the_ins.numo;z>opcode->m_codenum;--z)\
the_ins.opcode[z]=the_ins.opcode[z-1];\
for(z=0;z<the_ins.nrel;z++)\
the_ins.reloc[z].n+=2;\
the_ins.opcode[opcode->m_codenum]=w;\
the_ins.numo++;\
}
#define add_exp(beg,end) (\
the_ins.exprs[the_ins.nexp].e_beg=beg,\
the_ins.exprs[the_ins.nexp].e_end=end,\
&the_ins.exprs[the_ins.nexp++]\
)
/* The numo+1 kludge is so we can hit the low order byte of the prev word. Blecch*/
#define add_fix(width,exp,pc_rel) {\
the_ins.reloc[the_ins.nrel].n= ((width)=='B') ? (the_ins.numo*2-1) : \
(((width)=='b') ? ((the_ins.numo-1)*2) : (the_ins.numo*2));\
the_ins.reloc[the_ins.nrel].add=adds((exp));\
the_ins.reloc[the_ins.nrel].sub=subs((exp));\
the_ins.reloc[the_ins.nrel].off=offs((exp));\
the_ins.reloc[the_ins.nrel].wid=width;\
the_ins.reloc[the_ins.nrel++].pcrel=pc_rel;\
}
#define add_frag(add,off,type) {\
the_ins.fragb[the_ins.nfrag].fragoff=the_ins.numo;\
the_ins.fragb[the_ins.nfrag].fadd=add;\
the_ins.fragb[the_ins.nfrag].foff=off;\
the_ins.fragb[the_ins.nfrag++].fragty=type;\
}
#define isvar(exp) ((exp) && (adds(exp) || subs(exp)))
#define seg(exp) ((exp)->e_exp.X_seg)
#define adds(exp) ((exp)->e_exp.X_add_symbol)
#define subs(exp) ((exp)->e_exp.X_subtract_symbol)
#define offs(exp) ((exp)->e_exp.X_add_number)
struct m68_incant {
char *m_operands;
unsigned long m_opcode;
short m_opnum;
short m_codenum;
struct m68_incant *m_next;
};
#define getone(x) ((((x)->m_opcode)>>16)&0xffff)
#define gettwo(x) (((x)->m_opcode)&0xffff)
#ifdef __STDC__
static char *crack_operand(char *str, struct m68k_op *opP);
static int get_num(struct m68k_exp *exp, int ok);
static int get_regs(int i, char *str, struct m68k_op *opP);
static int reverse_16_bits(int in);
static int reverse_8_bits(int in);
static int try_index(char **s, struct m68k_op *opP);
static void install_gen_operand(int mode, int val);
static void install_operand(int mode, int val);
static void s_bss(void);
static void s_data1(void);
static void s_data2(void);
static void s_even(void);
static void s_proc(void);
#else /* __STDC__ */
static char *crack_operand();
static int get_num();
static int get_regs();
static int reverse_16_bits();
static int reverse_8_bits();
static int try_index();
static void install_gen_operand();
static void install_operand();
static void s_bss();
static void s_data1();
static void s_data2();
static void s_even();
static void s_proc();
#endif /* __STDC__ */
/* BCC68000 is for patching in an extra jmp instruction for long offsets
on the 68000. The 68000 doesn't support long branches with branchs */
/* This table desribes how you change sizes for the various types of variable
size expressions. This version only supports two kinds. */
/* Note that calls to frag_var need to specify the maximum expansion needed */
/* This is currently 10 bytes for DBCC */
/* The fields are:
How far Forward this mode will reach:
How far Backward this mode will reach:
How many bytes this mode will add to the size of the frag
Which mode to go to if the offset won't fit in this one
*/
const relax_typeS
md_relax_table[] = {
{ 1, 1, 0, 0 }, /* First entries aren't used */
{ 1, 1, 0, 0 }, /* For no good reason except */
{ 1, 1, 0, 0 }, /* that the VAX doesn't either */
{ 1, 1, 0, 0 },
{ (127), (-128), 0, TAB(BRANCH,SHORT)},
{ (32767), (-32768), 2, TAB(BRANCH,LONG) },
{ 0, 0, 4, 0 },
{ 1, 1, 0, 0 },
{ 1, 1, 0, 0 }, /* FBRANCH doesn't come BYTE */
{ (32767), (-32768), 2, TAB(FBRANCH,LONG)},
{ 0, 0, 4, 0 },
{ 1, 1, 0, 0 },
{ 1, 1, 0, 0 }, /* PCREL doesn't come BYTE */
{ (32767), (-32768), 2, TAB(PCREL,LONG)},
{ 0, 0, 4, 0 },
{ 1, 1, 0, 0 },
{ (127), (-128), 0, TAB(BCC68000,SHORT)},
{ (32767), (-32768), 2, TAB(BCC68000,LONG) },
{ 0, 0, 6, 0 }, /* jmp long space */
{ 1, 1, 0, 0 },
{ 1, 1, 0, 0 }, /* DBCC doesn't come BYTE */
{ (32767), (-32768), 2, TAB(DBCC,LONG) },
{ 0, 0, 10, 0 }, /* bra/jmp long space */
{ 1, 1, 0, 0 },
{ 1, 1, 0, 0 }, /* PCLEA doesn't come BYTE */
{ 32767, -32768, 2, TAB(PCLEA,LONG) },
{ 0, 0, 6, 0 },
{ 1, 1, 0, 0 },
};
/* These are the machine dependent pseudo-ops. These are included so
the assembler can work on the output from the SUN C compiler, which
generates these.
*/
/* 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[] = {
{ "data1", s_data1, 0 },
{ "data2", s_data2, 0 },
{ "bss", s_bss, 0 },
{ "even", s_even, 0 },
{ "skip", s_space, 0 },
{ "proc", s_proc, 0 },
{ 0, 0, 0 }
};
/* #define isbyte(x) ((x)>=-128 && (x)<=127) */
/* #define isword(x) ((x)>=-32768 && (x)<=32767) */
#define issbyte(x) ((x)>=-128 && (x)<=127)
#define isubyte(x) ((x)>=0 && (x)<=255)
#define issword(x) ((x)>=-32768 && (x)<=32767)
#define isuword(x) ((x)>=0 && (x)<=65535)
#define isbyte(x) ((x)>=-128 && (x)<=255)
#define isword(x) ((x)>=-32768 && (x)<=65535)
#define islong(x) (1)
extern char *input_line_pointer;
/* Operands we can parse: (And associated modes)
numb: 8 bit num
numw: 16 bit num
numl: 32 bit num
dreg: data reg 0-7
reg: address or data register
areg: address register
apc: address register, PC, ZPC or empty string
num: 16 or 32 bit num
num2: like num
sz: w or l if omitted, l assumed
scale: 1 2 4 or 8 if omitted, 1 assumed
7.4 IMMED #num --> NUM
0.? DREG dreg --> dreg
1.? AREG areg --> areg
2.? AINDR areg@ --> *(areg)
3.? AINC areg@+ --> *(areg++)
4.? ADEC areg@- --> *(--areg)
5.? AOFF apc@(numw) --> *(apc+numw) -- empty string and ZPC not allowed here
6.? AINDX apc@(num,reg:sz:scale) --> *(apc+num+reg*scale)
6.? AINDX apc@(reg:sz:scale) --> same, with num=0
6.? APODX apc@(num)@(num2,reg:sz:scale) --> *(*(apc+num)+num2+reg*scale)
6.? APODX apc@(num)@(reg:sz:scale) --> same, with num2=0
6.? AMIND apc@(num)@(num2) --> *(*(apc+num)+num2) (previous mode without an index reg)
6.? APRDX apc@(num,reg:sz:scale)@(num2) --> *(*(apc+num+reg*scale)+num2)
6.? APRDX apc@(reg:sz:scale)@(num2) --> same, with num=0
7.0 ABSL num:sz --> *(num)
num --> *(num) (sz L assumed)
*** MSCR otherreg --> Magic
With -l option
5.? AOFF apc@(num) --> *(apc+num) -- empty string and ZPC not allowed here still
examples:
#foo #0x35 #12
d2
a4
a3@
a5@+
a6@-
a2@(12) pc@(14)
a1@(5,d2:w:1) @(45,d6:l:4)
pc@(a2) @(d4)
etc . . .
#name@(numw) -->turn into PC rel mode
apc@(num8,reg:sz:scale) --> *(apc+num8+reg*scale)
*/
#define IMMED 1
#define DREG 2
#define AREG 3
#define AINDR 4
#define ADEC 5
#define AINC 6
#define AOFF 7
#define AINDX 8
#define APODX 9
#define AMIND 10
#define APRDX 11
#define ABSL 12
#define MSCR 13
#define REGLST 14
#define FAIL 0
#define OK 1
/* DATA and ADDR have to be contiguous, so that reg-DATA gives 0-7==data reg,
8-15==addr reg for operands that take both types */
#define DATA 1 /* 1- 8 == data registers 0-7 */
#define ADDR (DATA+8) /* 9-16 == address regs 0-7 */
#define FPREG (ADDR+8) /* 17-24 Eight FP registers */
#define COPNUM (FPREG+8) /* 25-32 Co-processor #1-#8 */
#define PC (COPNUM+8) /* 33 Program counter */
#define ZPC (PC+1) /* 34 Hack for Program space, but 0 addressing */
#define SR (ZPC+1) /* 35 Status Reg */
#define CCR (SR+1) /* 36 Condition code Reg */
/* These have to be in order for the movec instruction to work. */
#define USP (CCR+1) /* 37 User Stack Pointer */
#define ISP (USP+1) /* 38 Interrupt stack pointer */
#define SFC (ISP+1) /* 39 */
#define DFC (SFC+1) /* 40 */
#define CACR (DFC+1) /* 41 */
#define VBR (CACR+1) /* 42 */
#define CAAR (VBR+1) /* 43 */
#define MSP (CAAR+1) /* 44 */
#define FPI (MSP+1) /* 45 */
#define FPS (FPI+1) /* 46 */
#define FPC (FPS+1) /* 47 */
/*
* these defines should be in m68k.c but
* i put them here to keep all the m68851 stuff
* together -rab
* JF--Make sure these #s don't clash with the ones in m68k.c
* That would be BAD.
*/
#define TC (FPC+1) /* 48 */
#define DRP (TC+1) /* 49 */
#define SRP (DRP+1) /* 50 */
#define CRP (SRP+1) /* 51 */
#define CAL (CRP+1) /* 52 */
#define VAL (CAL+1) /* 53 */
#define SCC (VAL+1) /* 54 */
#define AC (SCC+1) /* 55 */
#define BAD (AC+1) /* 56,57,58,59, 60,61,62,63 */
#define BAC (BAD+8) /* 64,65,66,67, 68,69,70,71 */
#define PSR (BAC+8) /* 72 */
#define PCSR (PSR+1) /* 73 */
/* Note that COPNUM==processor #1 -- COPNUM+7==#8, which stores as 000 */
/* I think. . . */
#define SP ADDR+7
/* JF these tables here are for speed at the expense of size */
/* You can replace them with the #if 0 versions if you really
need space and don't mind it running a bit slower */
static char mklower_table[256];
#define mklower(c) (mklower_table[(unsigned char)(c)])
static char notend_table[256];
static char alt_notend_table[256];
#define notend(s) ( !(notend_table[(unsigned char)(*s)] || (*s==':' &&\
alt_notend_table[(unsigned char)(s[1])])))
#if 0
#define mklower(c) (isupper(c) ? tolower(c) : c)
#endif
/* JF modified this to handle cases where the first part of a symbol name
looks like a register */
int
m68k_reg_parse(ccp)
register char **ccp;
{
register char c1,
c2,
c3,
c4;
register int n = 0,
ret = FAIL;
c1=mklower(ccp[0][0]);
#ifdef REGISTER_PREFIX
if(c1!=REGISTER_PREFIX)
return FAIL;
c1=mklower(ccp[0][1]);
c2=mklower(ccp[0][2]);
c3=mklower(ccp[0][3]);
c4=mklower(ccp[0][4]);
#else
c2=mklower(ccp[0][1]);
c3=mklower(ccp[0][2]);
c4=mklower(ccp[0][3]);
#endif
switch(c1) {
case 'a':
if(c2>='0' && c2<='7') {
n=2;
ret=ADDR+c2-'0';
}
#ifdef m68851
else if (c2 == 'c') {
n = 2;
ret = AC;
}
#endif
break;
#ifdef m68851
case 'b':
if (c2 == 'a') {
if (c3 == 'd') {
if (c4 >= '0' && c4 <= '7') {
n = 4;
ret = BAD + c4 - '0';
}
}
if (c3 == 'c') {
if (c4 >= '0' && c4 <= '7') {
n = 4;
ret = BAC + c4 - '0';
}
}
}
break;
#endif
case 'c':
#ifdef m68851
if (c2 == 'a' && c3 == 'l') {
n = 3;
ret = CAL;
} else
#endif
/* This supports both CCR and CC as the ccr reg. */
if(c2=='c' && c3=='r') {
n=3;
ret = CCR;
} else if(c2=='c') {
n=2;
ret = CCR;
} else if(c2=='a' && (c3=='a' || c3=='c') && c4=='r') {
n=4;
ret = c3=='a' ? CAAR : CACR;
}
#ifdef m68851
else if (c2 == 'r' && c3 == 'p') {
n = 3;
ret = (CRP);
}
#endif
break;
case 'd':
if(c2>='0' && c2<='7') {
n=2;
ret = DATA+c2-'0';
} else if(c2=='f' && c3=='c') {
n=3;
ret = DFC;
}
#ifdef m68851
else if (c2 == 'r' && c3 == 'p') {
n = 3;
ret = (DRP);
}
#endif
break;
case 'f':
if(c2=='p') {
if(c3>='0' && c3<='7') {
n=3;
ret = FPREG+c3-'0';
if(c4==':')
ccp[0][3]=',';
} else if(c3=='i') {
n=3;
ret = FPI;
} else if(c3=='s') {
n= (c4 == 'r' ? 4 : 3);
ret = FPS;
} else if(c3=='c') {
n= (c4 == 'r' ? 4 : 3);
ret = FPC;
}
}
break;
case 'i':
if(c2=='s' && c3=='p') {
n=3;
ret = ISP;
}
break;
case 'm':
if(c2=='s' && c3=='p') {
n=3;
ret = MSP;
}
break;
case 'p':
if(c2=='c') {
#ifdef m68851
if(c3 == 's' && c4=='r') {
n=4;
ret = (PCSR);
} else
#endif
{
n=2;
ret = PC;
}
}
#ifdef m68851
else if (c2 == 's' && c3 == 'r') {
n = 3;
ret = (PSR);
}
#endif
break;
case 's':
#ifdef m68851
if (c2 == 'c' && c3 == 'c') {
n = 3;
ret = (SCC);
} else if (c2 == 'r' && c3 == 'p') {
n = 3;
ret = (SRP);
} else
#endif
if(c2=='r') {
n=2;
ret = SR;
} else if(c2=='p') {
n=2;
ret = ADDR+7;
} else if(c2=='f' && c3=='c') {
n=3;
ret = SFC;
}
break;
#ifdef m68851
case 't':
if(c2 == 'c') {
n=2;
ret=TC;
}
break;
#endif
case 'u':
if(c2=='s' && c3=='p') {
n=3;
ret = USP;
}
break;
case 'v':
#ifdef m68851
if (c2 == 'a' && c3 == 'l') {
n = 3;
ret = (VAL);
} else
#endif
if(c2=='b' && c3=='r') {
n=3;
ret = VBR;
}
break;
case 'z':
if(c2=='p' && c3=='c') {
n=3;
ret = ZPC;
}
break;
default:
break;
}
if(n) {
#ifdef REGISTER_PREFIX
n++;
#endif
if(isalnum(ccp[0][n]) || ccp[0][n]=='_')
ret=FAIL;
else
ccp[0]+=n;
} else
ret = FAIL;
return ret;
}
#define SKIP_WHITE() { str++; if(*str==' ') str++;}
int
m68k_ip_op(str,opP)
char *str;
register struct m68k_op *opP;
{
char *strend;
long i;
if(*str==' ')
str++;
/* Find the end of the string */
if(!*str) {
/* Out of gas */
opP->error="Missing operand";
return FAIL;
}
for(strend=str;*strend;strend++)
;
--strend;
/* Guess what: A constant. Shar and enjoy */
if(*str=='#') {
str++;
opP->con1=add_exp(str,strend);
opP->mode=IMMED;
return OK;
}
i=m68k_reg_parse(&str);
if((i==FAIL || *str!='\0') && *str!='@') {
char *stmp;
if(i!=FAIL && (*str=='/' || *str=='-')) {
opP->mode=REGLST;
return get_regs(i,str,opP);
}
if((stmp=strchr(str,'@')) != '\0') {
opP->con1=add_exp(str,stmp-1);
if(stmp==strend) {
opP->mode=AINDX;
return OK;
}
stmp++;
if(*stmp++!='(' || *strend--!=')') {
opP->error="Malformed operand";
return FAIL;
}
i=try_index(&stmp,opP);
opP->con2=add_exp(stmp,strend);
if(i==FAIL) opP->mode=AMIND;
else opP->mode=APODX;
return OK;
}
opP->mode=ABSL;
opP->con1=add_exp(str,strend);
return OK;
}
opP->reg=i;
if(*str=='\0') {
if(i>=DATA+0 && i<=DATA+7)
opP->mode=DREG;
else if(i>=ADDR+0 && i<=ADDR+7)
opP->mode=AREG;
else
opP->mode=MSCR;
return OK;
}
if((i<ADDR+0 || i>ADDR+7) && i!=PC && i!=ZPC && i!=FAIL) { /* Can't indirect off non address regs */
opP->error="Invalid indirect register";
return FAIL;
}
if(*str!='@')
abort();
str++;
switch(*str) {
case '\0':
opP->mode=AINDR;
return OK;
case '-':
opP->mode=ADEC;
return OK;
case '+':
opP->mode=AINC;
return OK;
case '(':
str++;
break;
default:
opP->error="Junk after indirect";
return FAIL;
}
/* Some kind of indexing involved. Lets find out how bad it is */
i=try_index(&str,opP);
/* Didn't start with an index reg, maybe its offset or offset,reg */
if(i==FAIL) {
char *beg_str;
beg_str=str;
for(i=1;i;) {
switch(*str++) {
case '\0':
opP->error="Missing )";
return FAIL;
case ',': i=0; break;
case '(': i++; break;
case ')': --i; break;
}
}
/* if(str[-3]==':') {
int siz;
switch(str[-2]) {
case 'b':
case 'B':
siz=1;
break;
case 'w':
case 'W':
siz=2;
break;
case 'l':
case 'L':
siz=3;
break;
default:
opP->error="Specified size isn't :w or :l";
return FAIL;
}
opP->con1=add_exp(beg_str,str-4);
opP->con1->e_siz=siz;
} else */
opP->con1=add_exp(beg_str,str-2);
/* Should be offset,reg */
if(str[-1]==',') {
i=try_index(&str,opP);
if(i==FAIL) {
opP->error="Malformed index reg";
return FAIL;
}
}
}
/* We've now got offset) offset,reg) or reg) */
if(*str=='\0') {
/* Th-the-thats all folks */
if(opP->reg==FAIL) opP->mode=AINDX; /* Other form of indirect */
else if(opP->ireg==FAIL) opP->mode=AOFF;
else opP->mode=AINDX;
return OK;
}
/* Next thing had better be another @ */
if(*str!='@' || str[1]!='(') {
opP->error="junk after indirect";
return FAIL;
}
str+=2;
if(opP->ireg!=FAIL) {
opP->mode=APRDX;
i=try_index(&str,opP);
if(i!=FAIL) {
opP->error="Two index registers! not allowed!";
return FAIL;
}
} else
i=try_index(&str,opP);
if(i==FAIL) {
char *beg_str;
beg_str=str;
for(i=1;i;) {
switch(*str++) {
case '\0':
opP->error="Missing )";
return FAIL;
case ',': i=0; break;
case '(': i++; break;
case ')': --i; break;
}
}
opP->con2=add_exp(beg_str,str-2);
if(str[-1]==',') {
if(opP->ireg!=FAIL) {
opP->error="Can't have two index regs";
return FAIL;
}
i=try_index(&str,opP);
if(i==FAIL) {
opP->error="malformed index reg";
return FAIL;
}
opP->mode=APODX;
} else if(opP->ireg!=FAIL)
opP->mode=APRDX;
else
opP->mode=AMIND;
} else
opP->mode=APODX;
if(*str!='\0') {
opP->error="Junk after indirect";
return FAIL;
}
return OK;
}
static int try_index(s,opP)
char **s;
struct m68k_op *opP;
{
register int i;
char *ss;
#define SKIP_W() { ss++; if(*ss==' ') ss++;}
ss= *s;
/* SKIP_W(); */
i=m68k_reg_parse(&ss);
if(!(i>=DATA+0 && i<=ADDR+7)) { /* if i is not DATA or ADDR reg */
*s=ss;
return FAIL;
}
opP->ireg=i;
/* SKIP_W(); */
if(*ss==')') {
opP->isiz=0;
opP->imul=1;
SKIP_W();
*s=ss;
return OK;
}
if(*ss!=':') {
opP->error="Missing : in index register";
*s=ss;
return FAIL;
}
SKIP_W();
switch(*ss) {
case 'w':
case 'W':
opP->isiz=2;
break;
case 'l':
case 'L':
opP->isiz=3;
break;
default:
opP->error="Index register size spec not :w or :l";
*s=ss;
return FAIL;
}
SKIP_W();
if(*ss==':') {
SKIP_W();
switch(*ss) {
case '1':
case '2':
case '4':
case '8':
opP->imul= *ss-'0';
break;
default:
opP->error="index multiplier not 1, 2, 4 or 8";
*s=ss;
return FAIL;
}
SKIP_W();
} else opP->imul=1;
if(*ss!=')') {
opP->error="Missing )";
*s=ss;
return FAIL;
}
SKIP_W();
*s=ss;
return OK;
} /* try_index() */
#ifdef TEST1 /* TEST1 tests m68k_ip_op(), which parses operands */
main()
{
char buf[128];
struct m68k_op thark;
for(;;) {
if(!gets(buf))
break;
bzero(&thark,sizeof(thark));
if(!m68k_ip_op(buf,&thark)) printf("FAIL:");
if(thark.error)
printf("op1 error %s in %s\n",thark.error,buf);
printf("mode %d, reg %d, ",thark.mode,thark.reg);
if(thark.b_const)
printf("Constant: '%.*s',",1+thark.e_const-thark.b_const,thark.b_const);
printf("ireg %d, isiz %d, imul %d ",thark.ireg,thark.isiz,thark.imul);
if(thark.b_iadd)
printf("Iadd: '%.*s'",1+thark.e_iadd-thark.b_iadd,thark.b_iadd);
printf("\n");
}
exit(0);
}
#endif
static struct hash_control* op_hash = NULL; /* handle of the OPCODE hash table
NULL means any use before m68_ip_begin()
will crash */
/*
* m 6 8 _ i p ( )
*
* This converts a string into a 68k instruction.
* The string must be a bare single instruction in sun format
* with RMS-style 68020 indirects
* (example: )
*
* It provides some error messages: at most one fatal error message (which
* stops the scan) and at most one warning message for each operand.
* The 68k instruction is returned in exploded form, since we have no
* knowledge of how you parse (or evaluate) your expressions.
* We do however strip off and decode addressing modes and operation
* mnemonic.
*
* This function's value is a string. If it is not "" then an internal
* logic error was found: read this code to assign meaning to the string.
* No argument string should generate such an error string:
* it means a bug in our code, not in the user's text.
*
* You MUST have called m86_ip_begin() once and m86_ip_end() never before using
* this function.
*/
/* JF this function no longer returns a useful value. Sorry */
void
m68_ip (instring)
char *instring;
{
register char *p;
register struct m68k_op *opP;
register struct m68_incant *opcode;
register char *s;
register int tmpreg,
baseo,
outro,
nextword;
int siz1,
siz2;
char c;
int losing;
int opsfound;
LITTLENUM_TYPE words[6];
LITTLENUM_TYPE *wordp;
if (*instring == ' ')
instring++; /* skip leading whitespace */
/* Scan up to end of operation-code, which MUST end in end-of-string
or exactly 1 space. */
for (p = instring; *p != '\0'; p++)
if (*p == ' ')
break;
if (p == instring) {
the_ins.error = "No operator";
the_ins.opcode[0] = (short) NULL;
/* the_ins.numo=1; */
return;
}
/* p now points to the end of the opcode name, probably whitespace.
make sure the name is null terminated by clobbering the whitespace,
look it up in the hash table, then fix it back. */
c = *p;
*p = '\0';
opcode = (struct m68_incant *)hash_find (op_hash, instring);
*p = c;
if (opcode == NULL) {
the_ins.error = "Unknown operator";
the_ins.opcode[0] = (short) NULL;
/* the_ins.numo=1; */
return;
}
/* found a legitimate opcode, start matching operands */
for(opP= &the_ins.operands[0];*p;opP++) {
p = crack_operand (p, opP);
if(opP->error) {
the_ins.error=opP->error;
return;
}
}
opsfound=opP- &the_ins.operands[0];
/* This ugly hack is to support the floating pt opcodes in their standard form */
/* Essentially, we fake a first enty of type COP#1 */
if(opcode->m_operands[0]=='I') {
int n;
for(n=opsfound;n>0;--n)
the_ins.operands[n]=the_ins.operands[n-1];
/* bcopy((char *)(&the_ins.operands[0]),(char *)(&the_ins.operands[1]),opsfound*sizeof(the_ins.operands[0])); */
bzero((char *)(&the_ins.operands[0]),sizeof(the_ins.operands[0]));
the_ins.operands[0].mode=MSCR;
the_ins.operands[0].reg=COPNUM; /* COP #1 */
opsfound++;
}
/* We've got the operands. Find an opcode that'll
accept them */
for(losing=0;;) {
if(opsfound!=opcode->m_opnum)
losing++;
else for(s=opcode->m_operands,opP= &the_ins.operands[0];*s && !losing;s+=2,opP++) {
/* Warning: this switch is huge! */
/* I've tried to organize the cases into this order:
non-alpha first, then alpha by letter. lower-case goes directly
before uppercase counterpart. */
/* Code with multiple case ...: gets sorted by the lowest case ...
it belongs to. I hope this makes sense. */
switch(*s) {
case '!':
if(opP->mode==MSCR || opP->mode==IMMED ||
opP->mode==DREG || opP->mode==AREG || opP->mode==AINC || opP->mode==ADEC || opP->mode==REGLST)
losing++;
break;
case '#':
if(opP->mode!=IMMED)
losing++;
else {
long t;
t=get_num(opP->con1,80);
if(s[1]=='b' && !isbyte(t))
losing++;
else if(s[1]=='w' && !isword(t))
losing++;
}
break;
case '^':
case 'T':
if(opP->mode!=IMMED)
losing++;
break;
case '$':
if(opP->mode==MSCR || opP->mode==AREG ||
opP->mode==IMMED || opP->reg==PC || opP->reg==ZPC || opP->mode==REGLST)
losing++;
break;
case '%':
if(opP->mode==MSCR || opP->reg==PC ||
opP->reg==ZPC || opP->mode==REGLST)
losing++;
break;
case '&':
if(opP->mode==MSCR || opP->mode==DREG ||
opP->mode==AREG || opP->mode==IMMED || opP->reg==PC || opP->reg==ZPC ||
opP->mode==AINC || opP->mode==ADEC || opP->mode==REGLST)
losing++;
break;
case '*':
if(opP->mode==MSCR || opP->mode==REGLST)
losing++;
break;
case '+':
if(opP->mode!=AINC)
losing++;
break;
case '-':
if(opP->mode!=ADEC)
losing++;
break;
case '/':
if(opP->mode==MSCR || opP->mode==AREG ||
opP->mode==AINC || opP->mode==ADEC || opP->mode==IMMED || opP->mode==REGLST)
losing++;
break;
case ';':
if(opP->mode==MSCR || opP->mode==AREG || opP->mode==REGLST)
losing++;
break;
case '?':
if(opP->mode==MSCR || opP->mode==AREG ||
opP->mode==AINC || opP->mode==ADEC || opP->mode==IMMED || opP->reg==PC ||
opP->reg==ZPC || opP->mode==REGLST)
losing++;
break;
case '@':
if(opP->mode==MSCR || opP->mode==AREG ||
opP->mode==IMMED || opP->mode==REGLST)
losing++;
break;
case '~': /* For now! (JF FOO is this right?) */
if(opP->mode==MSCR || opP->mode==DREG ||
opP->mode==AREG || opP->mode==IMMED || opP->reg==PC || opP->reg==ZPC || opP->mode==REGLST)
losing++;
break;
case 'A':
if(opP->mode!=AREG)
losing++;
break;
case 'B': /* FOO */
if(opP->mode!=ABSL)
losing++;
break;
case 'C':
if(opP->mode!=MSCR || opP->reg!=CCR)
losing++;
break;
case 'd': /* FOO This mode is a KLUDGE!! */
if(opP->mode!=AOFF && (opP->mode!=ABSL ||
opP->con1->e_beg[0]!='(' || opP->con1->e_end[0]!=')'))
losing++;
break;
case 'D':
if(opP->mode!=DREG)
losing++;
break;
case 'F':
if(opP->mode!=MSCR || opP->reg<(FPREG+0) || opP->reg>(FPREG+7))
losing++;
break;
case 'I':
if(opP->mode!=MSCR || opP->reg<COPNUM ||
opP->reg>=COPNUM+7)
losing++;
break;
case 'J':
if(opP->mode!=MSCR || opP->reg<USP || opP->reg>MSP)
losing++;
break;
case 'k':
if(opP->mode!=IMMED)
losing++;
break;
case 'l':
case 'L':
if(opP->mode==DREG || opP->mode==AREG || opP->mode==FPREG) {
if(s[1]=='8')
losing++;
else {
opP->mode=REGLST;
opP->reg=1<<(opP->reg-DATA);
}
} else if(opP->mode!=REGLST) {
losing++;
} else if(s[1]=='8' && opP->reg&0x0FFffFF)
losing++;
else if(s[1]=='3' && opP->reg&0x7000000)
losing++;
break;
case 'M':
if(opP->mode!=IMMED)
losing++;
else {
long t;
t=get_num(opP->con1,80);
if(!issbyte(t) || isvar(opP->con1))
losing++;
}
break;
case 'O':
if(opP->mode!=DREG && opP->mode!=IMMED)
losing++;
break;
case 'Q':
if(opP->mode!=IMMED)
losing++;
else {
long t;
t=get_num(opP->con1,80);
if(t<1 || t>8 || isvar(opP->con1))
losing++;
}
break;
case 'R':
if(opP->mode!=DREG && opP->mode!=AREG)
losing++;
break;
case 's':
if(opP->mode!=MSCR || !(opP->reg==FPI || opP->reg==FPS || opP->reg==FPC))
losing++;
break;
case 'S':
if(opP->mode!=MSCR || opP->reg!=SR)
losing++;
break;
case 'U':
if(opP->mode!=MSCR || opP->reg!=USP)
losing++;
break;
/* JF these are out of order. We could put them
in order if we were willing to put up with
bunches of #ifdef m68851s in the code */
#ifdef m68851
/* Memory addressing mode used by pflushr */
case '|':
if(opP->mode==MSCR || opP->mode==DREG ||
opP->mode==AREG || opP->mode==REGLST)
losing++;
break;
case 'f':
if (opP->mode != MSCR || (opP->reg != SFC && opP->reg != DFC))
losing++;
break;
case 'P':
if (opP->mode != MSCR || (opP->reg != TC && opP->reg != CAL &&
opP->reg != VAL && opP->reg != SCC && opP->reg != AC))
losing++;
break;
case 'V':
if (opP->reg != VAL)
losing++;
break;
case 'W':
if (opP->mode != MSCR || (opP->reg != DRP && opP->reg != SRP &&
opP->reg != CRP))
losing++;
break;
case 'X':
if (opP->mode != MSCR ||
(!(opP->reg >= BAD && opP->reg <= BAD+7) &&
!(opP->reg >= BAC && opP->reg <= BAC+7)))
losing++;
break;
case 'Y':
if (opP->reg != PSR)
losing++;
break;
case 'Z':
if (opP->reg != PCSR)
losing++;
break;
#endif
default:
as_fatal("Internal error: Operand mode %c unknown in line %s of file \"%s\"",
*s, __LINE__, __FILE__);
}
}
if(!losing)
break;
opcode=opcode->m_next;
if(!opcode) { /* Fell off the end */
the_ins.error="instruction/operands mismatch";
return;
}
losing=0;
}
the_ins.args=opcode->m_operands;
the_ins.numargs=opcode->m_opnum;
the_ins.numo=opcode->m_codenum;
the_ins.opcode[0]=getone(opcode);
the_ins.opcode[1]=gettwo(opcode);
for(s=the_ins.args,opP= &the_ins.operands[0];*s;s+=2,opP++) {
/* This switch is a doozy.
What the first step; its a big one! */
switch(s[0]) {
case '*':
case '~':
case '%':
case ';':
case '@':
case '!':
case '&':
case '$':
case '?':
case '/':
#ifdef m68851
case '|':
#endif
switch(opP->mode) {
case IMMED:
tmpreg=0x3c; /* 7.4 */
if(strchr("bwl",s[1])) nextword=get_num(opP->con1,80);
else nextword=nextword=get_num(opP->con1,0);
if(isvar(opP->con1))
add_fix(s[1],opP->con1,0);
switch(s[1]) {
case 'b':
if(!isbyte(nextword))
opP->error="operand out of range";
addword(nextword);
baseo=0;
break;
case 'w':
if(!isword(nextword))
opP->error="operand out of range";
addword(nextword);
baseo=0;
break;
case 'l':
addword(nextword>>16);
addword(nextword);
baseo=0;
break;
case 'f':
baseo=2;
outro=8;
break;
case 'F':
baseo=4;
outro=11;
break;
case 'x':
baseo=6;
outro=15;
break;
case 'p':
baseo=6;
outro= -1;
break;
default:
as_fatal("Internal error: Can't decode %c%c in line %s of file \"%s\"",
*s, s[1], __LINE__, __FILE__);
}
if(!baseo)
break;
/* We gotta put out some float */
if(seg(opP->con1)!=SEG_BIG) {
int_to_gen(nextword);
gen_to_words(words,baseo,(long)outro);
for(wordp=words;baseo--;wordp++)
addword(*wordp);
break;
} /* Its BIG */
if(offs(opP->con1)>0) {
as_warn("Bignum assumed to be binary bit-pattern");
if(offs(opP->con1)>baseo) {
as_bad("Bignum too big for %c format; truncated",s[1]);
offs(opP->con1)=baseo;
}
baseo-=offs(opP->con1);
for(wordp=generic_bignum+offs(opP->con1)-1;offs(opP->con1)--;--wordp)
addword(*wordp);
while(baseo--)
addword(0);
break;
}
gen_to_words(words,baseo,(long)outro);
for(wordp=words;baseo--;wordp++)
addword(*wordp);
break;
case DREG:
tmpreg=opP->reg-DATA; /* 0.dreg */
break;
case AREG:
tmpreg=0x08+opP->reg-ADDR; /* 1.areg */
break;
case AINDR:
tmpreg=0x10+opP->reg-ADDR; /* 2.areg */
break;
case ADEC:
tmpreg=0x20+opP->reg-ADDR; /* 4.areg */
break;
case AINC:
tmpreg=0x18+opP->reg-ADDR; /* 3.areg */
break;
case AOFF:
nextword=get_num(opP->con1,80);
/* Force into index mode. Hope this works */
/* We do the first bit for 32-bit displacements,
and the second bit for 16 bit ones. It is
possible that we should make the default be
WORD instead of LONG, but I think that'd
break GCC, so we put up with a little
inefficiency for the sake of working output.
*/
if( !issword(nextword)
|| ( isvar(opP->con1)
&& ( ( opP->con1->e_siz==0
&& flagseen['l']==0)
|| opP->con1->e_siz==3))) {
if(opP->reg==PC)
tmpreg=0x3B; /* 7.3 */
else
tmpreg=0x30+opP->reg-ADDR; /* 6.areg */
if(isvar(opP->con1)) {
if(opP->reg==PC) {
add_frag(adds(opP->con1),
offs(opP->con1),
TAB(PCLEA,SZ_UNDEF));
break;
} else {
addword(0x0170);
add_fix('l',opP->con1,1);
}
} else
addword(0x0170);
addword(nextword>>16);
} else {
if(opP->reg==PC)
tmpreg=0x3A; /* 7.2 */
else
tmpreg=0x28+opP->reg-ADDR; /* 5.areg */
if(isvar(opP->con1)) {
if(opP->reg==PC) {
add_fix('w',opP->con1,1);
} else
add_fix('w',opP->con1,0);
}
}
addword(nextword);
break;
case AINDX:
case APODX:
case AMIND:
case APRDX:
nextword=0;
baseo=get_num(opP->con1,80);
outro=get_num(opP->con2,80);
/* Figure out the 'addressing mode' */
/* Also turn on the BASE_DISABLE bit, if needed */
if(opP->reg==PC || opP->reg==ZPC) {
tmpreg=0x3b; /* 7.3 */
if(opP->reg==ZPC)
nextword|=0x80;
} else if(opP->reg==FAIL) {
nextword|=0x80;
tmpreg=0x30; /* 6.garbage */
} else tmpreg=0x30+opP->reg-ADDR; /* 6.areg */
siz1= (opP->con1) ? opP->con1->e_siz : 0;
siz2= (opP->con2) ? opP->con2->e_siz : 0;
/* Index register stuff */
if(opP->ireg>=DATA+0 && opP->ireg<=ADDR+7) {
nextword|=(opP->ireg-DATA)<<12;
if(opP->isiz==0 || opP->isiz==3)
nextword|=0x800;
switch(opP->imul) {
case 1: break;
case 2: nextword|=0x200; break;
case 4: nextword|=0x400; break;
case 8: nextword|=0x600; break;
default: abort();
}
/* IF its simple,
GET US OUT OF HERE! */
/* Must be INDEX, with an index
register. Address register
cannot be ZERO-PC, and either
:b was forced, or we know
it will fit */
if( opP->mode==AINDX
&& opP->reg!=FAIL
&& opP->reg!=ZPC
&& ( siz1==1
|| ( issbyte(baseo)
&& !isvar(opP->con1)))) {
nextword +=baseo&0xff;
addword(nextword);
if(isvar(opP->con1))
add_fix('B',opP->con1,0);
break;
}
} else
nextword|=0x40; /* No index reg */
/* It aint simple */
nextword|=0x100;
/* If the guy specified a width, we assume that
it is wide enough. Maybe it isn't. Ifso, we lose
*/
switch(siz1) {
case 0:
if(isvar(opP->con1) || !issword(baseo)) {
siz1=3;
nextword|=0x30;
} else if(baseo==0)
nextword|=0x10;
else {
nextword|=0x20;
siz1=2;
}
break;
case 1:
as_warn("Byte dispacement won't work. Defaulting to :w");
case 2:
nextword|=0x20;
break;
case 3:
nextword|=0x30;
break;
}
/* Figure out innner displacement stuff */
if(opP->mode!=AINDX) {
switch(siz2) {
case 0:
if(isvar(opP->con2) || !issword(outro)) {
siz2=3;
nextword|=0x3;
} else if(outro==0)
nextword|=0x1;
else {
nextword|=0x2;
siz2=2;
}
break;
case 1:
as_warn("Byte dispacement won't work. Defaulting to :w");
case 2:
nextword|=0x2;
break;
case 3:
nextword|=0x3;
break;
}
if(opP->mode==APODX) nextword|=0x04;
else if(opP->mode==AMIND) nextword|=0x40;
}
addword(nextword);
if(isvar(opP->con1)) {
if(opP->reg==PC || opP->reg==ZPC) {
add_fix(siz1==3 ? 'l' : 'w',opP->con1,1);
opP->con1->e_exp.X_add_number+=6;
} else
add_fix(siz1==3 ? 'l' : 'w',opP->con1,0);
}
if(siz1==3)
addword(baseo>>16);
if(siz1)
addword(baseo);
if(isvar(opP->con2)) {
if(opP->reg==PC || opP->reg==ZPC) {
add_fix(siz2==3 ? 'l' : 'w',opP->con2,1);
opP->con1->e_exp.X_add_number+=6;
} else
add_fix(siz2==3 ? 'l' : 'w',opP->con2,0);
}
if(siz2==3)
addword(outro>>16);
if(siz2)
addword(outro);
break;
case ABSL:
nextword=get_num(opP->con1,80);
switch(opP->con1->e_siz) {
default:
as_bad("Unknown size for absolute reference");
case 0:
if(!isvar(opP->con1) && issword(offs(opP->con1))) {
tmpreg=0x38; /* 7.0 */
addword(nextword);
break;
}
if(isvar(opP->con1) &&
!subs(opP->con1) &&
!strchr("~%&$?", s[0])) {
tmpreg=0x3A; /* 7.2 */
add_frag(adds(opP->con1),
offs(opP->con1),
TAB(PCREL,SZ_UNDEF));
break;
}
case 3: /* Fall through into long */
if(isvar(opP->con1))
add_fix('l',opP->con1,0);
tmpreg=0x39; /* 7.1 mode */
addword(nextword>>16);
addword(nextword);
break;
case 2: /* Word */
if(isvar(opP->con1))
add_fix('w',opP->con1,0);
tmpreg=0x38; /* 7.0 mode */
addword(nextword);
break;
}
break;
case MSCR:
default:
as_bad("unknown/incorrect operand");
/* abort(); */
}
install_gen_operand(s[1],tmpreg);
break;
case '#':
case '^':
switch(s[1]) { /* JF: I hate floating point! */
case 'j':
tmpreg=70;
break;
case '8':
tmpreg=20;
break;
case 'C':
tmpreg=50;
break;
case '3':
default:
tmpreg=80;
break;
}
tmpreg=get_num(opP->con1,tmpreg);
if(isvar(opP->con1))
add_fix(s[1],opP->con1,0);
switch(s[1]) {
case 'b': /* Danger: These do no check for
certain types of overflow.
user beware! */
if(!isbyte(tmpreg))
opP->error="out of range";
insop(tmpreg);
if(isvar(opP->con1))
the_ins.reloc[the_ins.nrel-1].n=(opcode->m_codenum)*2;
break;
case 'w':
if(!isword(tmpreg))
opP->error="out of range";
insop(tmpreg);
if(isvar(opP->con1))
the_ins.reloc[the_ins.nrel-1].n=(opcode->m_codenum)*2;
break;
case 'l':
insop(tmpreg); /* Because of the way insop works, we put these two out backwards */
insop(tmpreg>>16);
if(isvar(opP->con1))
the_ins.reloc[the_ins.nrel-1].n=(opcode->m_codenum)*2;
break;
case '3':
tmpreg&=0xFF;
case '8':
case 'C':
install_operand(s[1],tmpreg);
break;
default:
as_fatal("Internal error: Unknown mode #%c in line %s of file \"%s\"", s[1], __LINE__, __FILE__);
}
break;
case '+':
case '-':
case 'A':
install_operand(s[1],opP->reg-ADDR);
break;
case 'B':
tmpreg=get_num(opP->con1,80);
switch(s[1]) {
case 'g':
if(opP->con1->e_siz) { /* Deal with fixed size stuff by hand */
switch(opP->con1->e_siz) {
case 1:
add_fix('b',opP->con1,1);
break;
case 2:
add_fix('w',opP->con1,1);
addword(0);
break;
case 3:
add_fix('l',opP->con1,1);
addword(0);
addword(0);
break;
default:
as_bad("Bad size for expression %d", opP->con1->e_siz);
}
} else if(subs(opP->con1)) {
/* We can't relax it */
the_ins.opcode[the_ins.numo-1]|=0xff;
add_fix('l',opP->con1,1);
addword(0);
addword(0);
} else if(adds(opP->con1)) {
if (flagseen['m'] &&
(the_ins.opcode[0] >= 0x6200) &&
(the_ins.opcode[0] <= 0x6f00)) {
add_frag(adds(opP->con1),offs(opP->con1),TAB(BCC68000,SZ_UNDEF));
} else {
add_frag(adds(opP->con1),offs(opP->con1),TAB(BRANCH,SZ_UNDEF));
}
} else {
/* JF: This is the WRONG thing to do
add_frag((symbolS *)0,offs(opP->con1),TAB(BRANCH,BYTE)); */
the_ins.opcode[the_ins.numo-1]|=0xff;
offs(opP->con1)+=4;
add_fix('l',opP->con1,1);
addword(0);
addword(0);
}
break;
case 'w':
if(isvar(opP->con1)) {
/* check for DBcc instruction */
if ((the_ins.opcode[0] & 0xf0f8) ==0x50c8) {
/* size varies if patch */
/* needed for long form */
add_frag(adds(opP->con1),offs(opP->con1),TAB(DBCC,SZ_UNDEF));
break;
}
/* Don't ask! */
opP->con1->e_exp.X_add_number+=2;
add_fix('w',opP->con1,1);
}
addword(0);
break;
case 'c':
if(opP->con1->e_siz) {
switch(opP->con1->e_siz) {
case 2:
add_fix('w',opP->con1,1)
addword(0);
break;
case 3:
the_ins.opcode[the_ins.numo-1]|=0x40;
add_fix('l',opP->con1,1);
addword(0);
addword(0);
break;
default:
as_bad("Bad size for offset, must be word or long");
break;
}
} else if(subs(opP->con1)) {
add_fix('l',opP->con1,1);
add_frag((symbolS *)0,(long)0,TAB(FBRANCH,LONG));
} else if(adds(opP->con1)) {
add_frag(adds(opP->con1),offs(opP->con1),TAB(FBRANCH,SZ_UNDEF));
} else {
/* add_frag((symbolS *)0,offs(opP->con1),TAB(FBRANCH,SHORT)); */
the_ins.opcode[the_ins.numo-1]|=0x40;
add_fix('l',opP->con1,1);
addword(0);
addword(4);
}
break;
default:
as_fatal("Internal error: operand type B%c unknown in line %s of file \"%s\"",
s[1], __LINE__, __FILE__);
}
break;
case 'C': /* Ignore it */
break;
case 'd': /* JF this is a kludge */
if(opP->mode==AOFF) {
install_operand('s',opP->reg-ADDR);
} else {
char *tmpP;
tmpP=opP->con1->e_end-2;
opP->con1->e_beg++;
opP->con1->e_end-=4; /* point to the , */
baseo=m68k_reg_parse(&tmpP);
if(baseo<ADDR+0 || baseo>ADDR+7) {
as_bad("Unknown address reg, using A0");
baseo=0;
} else baseo-=ADDR;
install_operand('s',baseo);
}
tmpreg=get_num(opP->con1,80);
if(!issword(tmpreg)) {
as_bad("Expression out of range, using 0");
tmpreg=0;
}
addword(tmpreg);
break;
case 'D':
install_operand(s[1],opP->reg-DATA);
break;
case 'F':
install_operand(s[1],opP->reg-FPREG);
break;
case 'I':
tmpreg=1+opP->reg-COPNUM;
if(tmpreg==8)
tmpreg=0;
install_operand(s[1],tmpreg);
break;
case 'J': /* JF foo */
switch(opP->reg) {
case SFC:
tmpreg=0;
break;
case DFC:
tmpreg=0x001;
break;
case CACR:
tmpreg=0x002;
break;
case USP:
tmpreg=0x800;
break;
case VBR:
tmpreg=0x801;
break;
case CAAR:
tmpreg=0x802;
break;
case MSP:
tmpreg=0x803;
break;
case ISP:
tmpreg=0x804;
break;
default:
abort();
}
install_operand(s[1],tmpreg);
break;
case 'k':
tmpreg=get_num(opP->con1,55);
install_operand(s[1],tmpreg&0x7f);
break;
case 'l':
tmpreg=opP->reg;
if(s[1]=='w') {
if(tmpreg&0x7FF0000)
as_bad("Floating point register in register list");
insop(reverse_16_bits(tmpreg));
} else {
if(tmpreg&0x700FFFF)
as_bad("Wrong register in floating-point reglist");
install_operand(s[1],reverse_8_bits(tmpreg>>16));
}
break;
case 'L':
tmpreg=opP->reg;
if(s[1]=='w') {
if(tmpreg&0x7FF0000)
as_bad("Floating point register in register list");
insop(tmpreg);
} else if(s[1]=='8') {
if(tmpreg&0x0FFFFFF)
as_bad("incorrect register in reglist");
install_operand(s[1],tmpreg>>24);
} else {
if(tmpreg&0x700FFFF)
as_bad("wrong register in floating-point reglist");
else
install_operand(s[1],tmpreg>>16);
}
break;
case 'M':
install_operand(s[1],get_num(opP->con1,60));
break;
case 'O':
tmpreg= (opP->mode==DREG)
? 0x20+opP->reg-DATA
: (get_num(opP->con1,40)&0x1F);
install_operand(s[1],tmpreg);
break;
case 'Q':
tmpreg=get_num(opP->con1,10);
if(tmpreg==8)
tmpreg=0;
install_operand(s[1],tmpreg);
break;
case 'R':
/* This depends on the fact that ADDR registers are
eight more than their corresponding DATA regs, so
the result will have the ADDR_REG bit set */
install_operand(s[1],opP->reg-DATA);
break;
case 's':
if(opP->reg==FPI) tmpreg=0x1;
else if(opP->reg==FPS) tmpreg=0x2;
else if(opP->reg==FPC) tmpreg=0x4;
else abort();
install_operand(s[1],tmpreg);
break;
case 'S': /* Ignore it */
break;
case 'T':
install_operand(s[1],get_num(opP->con1,30));
break;
case 'U': /* Ignore it */
break;
#ifdef m68851
/* JF: These are out of order, I fear. */
case 'f':
switch (opP->reg) {
case SFC:
tmpreg=0;
break;
case DFC:
tmpreg=1;
break;
default:
abort();
}
install_operand(s[1],tmpreg);
break;
case 'P':
switch(opP->reg) {
case TC:
tmpreg=0;
break;
case CAL:
tmpreg=4;
break;
case VAL:
tmpreg=5;
break;
case SCC:
tmpreg=6;
break;
case AC:
tmpreg=7;
break;
default:
abort();
}
install_operand(s[1],tmpreg);
break;
case 'V':
if (opP->reg == VAL)
break;
abort();
case 'W':
switch(opP->reg) {
case DRP:
tmpreg=1;
break;
case SRP:
tmpreg=2;
break;
case CRP:
tmpreg=3;
break;
default:
abort();
}
install_operand(s[1],tmpreg);
break;
case 'X':
switch (opP->reg) {
case BAD: case BAD+1: case BAD+2: case BAD+3:
case BAD+4: case BAD+5: case BAD+6: case BAD+7:
tmpreg = (4 << 10) | ((opP->reg - BAD) << 2);
break;
case BAC: case BAC+1: case BAC+2: case BAC+3:
case BAC+4: case BAC+5: case BAC+6: case BAC+7:
tmpreg = (5 << 10) | ((opP->reg - BAC) << 2);
break;
default:
abort();
}
install_operand(s[1], tmpreg);
break;
case 'Y':
if (opP->reg == PSR)
break;
abort();
case 'Z':
if (opP->reg == PCSR)
break;
abort();
#endif /* m68851 */
default:
as_fatal("Internal error: Operand type %c unknown in line %s of file \"%s\"", s[0], __LINE__, __FILE__);
}
}
/* By the time whe get here (FINALLY) the_ins contains the complete
instruction, ready to be emitted. . . */
}
static int get_regs(i,str,opP)
int i;
struct m68k_op *opP;
char *str;
{
/* 26, 25, 24, 23-16, 15-8, 0-7 */
/* Low order 24 bits encoded fpc,fps,fpi,fp7-fp0,a7-a0,d7-d0 */
unsigned long cur_regs = 0;
int reg1,
reg2;
#define ADD_REG(x) { if(x==FPI) cur_regs|=(1<<24);\
else if(x==FPS) cur_regs|=(1<<25);\
else if(x==FPC) cur_regs|=(1<<26);\
else cur_regs|=(1<<(x-1)); }
reg1=i;
for(;;) {
if(*str=='/') {
ADD_REG(reg1);
str++;
} else if(*str=='-') {
str++;
reg2=m68k_reg_parse(&str);
if(reg2<DATA || reg2>=FPREG+8 || reg1==FPI || reg1==FPS || reg1==FPC) {
opP->error="unknown register in register list";
return FAIL;
}
while(reg1<=reg2) {
ADD_REG(reg1);
reg1++;
}
if(*str=='\0')
break;
} else if(*str=='\0') {
ADD_REG(reg1);
break;
} else {
opP->error="unknow character in register list";
return FAIL;
}
/* DJA -- Bug Fix. Did't handle d1-d2/a1 until the following instruction was added */
if (*str=='/')
str ++;
reg1=m68k_reg_parse(&str);
if((reg1<DATA || reg1>=FPREG+8) && !(reg1==FPI || reg1==FPS || reg1==FPC)) {
opP->error="unknown register in register list";
return FAIL;
}
}
opP->reg=cur_regs;
return OK;
} /* get_regs() */
static int reverse_16_bits(in)
int in;
{
int out=0;
int n;
static int mask[16] = {
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0080,
0x0100,0x0200,0x0400,0x0800,0x1000,0x2000,0x4000,0x8000
};
for(n=0;n<16;n++) {
if(in&mask[n])
out|=mask[15-n];
}
return out;
} /* reverse_16_bits() */
static int reverse_8_bits(in)
int in;
{
int out=0;
int n;
static int mask[8] = {
0x0001,0x0002,0x0004,0x0008,0x0010,0x0020,0x0040,0x0080,
};
for(n=0;n<8;n++) {
if(in&mask[n])
out|=mask[7-n];
}
return out;
} /* reverse_8_bits() */
static void install_operand(mode,val)
int mode;
int val;
{
switch(mode) {
case 's':
the_ins.opcode[0]|=val & 0xFF; /* JF FF is for M kludge */
break;
case 'd':
the_ins.opcode[0]|=val<<9;
break;
case '1':
the_ins.opcode[1]|=val<<12;
break;
case '2':
the_ins.opcode[1]|=val<<6;
break;
case '3':
the_ins.opcode[1]|=val;
break;
case '4':
the_ins.opcode[2]|=val<<12;
break;
case '5':
the_ins.opcode[2]|=val<<6;
break;
case '6':
/* DANGER! This is a hack to force cas2l and cas2w cmds
to be three words long! */
the_ins.numo++;
the_ins.opcode[2]|=val;
break;
case '7':
the_ins.opcode[1]|=val<<7;
break;
case '8':
the_ins.opcode[1]|=val<<10;
break;
#ifdef m68851
case '9':
the_ins.opcode[1]|=val<<5;
break;
#endif
case 't':
the_ins.opcode[1]|=(val<<10)|(val<<7);
break;
case 'D':
the_ins.opcode[1]|=(val<<12)|val;
break;
case 'g':
the_ins.opcode[0]|=val=0xff;
break;
case 'i':
the_ins.opcode[0]|=val<<9;
break;
case 'C':
the_ins.opcode[1]|=val;
break;
case 'j':
the_ins.opcode[1]|=val;
the_ins.numo++; /* What a hack */
break;
case 'k':
the_ins.opcode[1]|=val<<4;
break;
case 'b':
case 'w':
case 'l':
break;
case 'c':
default:
abort();
}
} /* install_operand() */
static void install_gen_operand(mode,val)
int mode;
int val;
{
switch(mode) {
case 's':
the_ins.opcode[0]|=val;
break;
case 'd':
/* This is a kludge!!! */
the_ins.opcode[0]|=(val&0x07)<<9|(val&0x38)<<3;
break;
case 'b':
case 'w':
case 'l':
case 'f':
case 'F':
case 'x':
case 'p':
the_ins.opcode[0]|=val;
break;
/* more stuff goes here */
default:
abort();
}
} /* install_gen_operand() */
static char *crack_operand(str,opP)
register char *str;
register struct m68k_op *opP;
{
register int parens;
register int c;
register char *beg_str;
if(!str) {
return str;
}
beg_str=str;
for(parens=0;*str && (parens>0 || notend(str));str++) {
if(*str=='(') parens++;
else if(*str==')') {
if(!parens) { /* ERROR */
opP->error="Extra )";
return str;
}
--parens;
}
}
if(!*str && parens) { /* ERROR */
opP->error="Missing )";
return str;
}
c= *str;
*str='\0';
if(m68k_ip_op(beg_str,opP)==FAIL) {
*str=c;
return str;
}
*str=c;
if(c=='}')
c= *++str; /* JF bitfield hack */
if(c) {
c= *++str;
if(!c)
as_bad("Missing operand");
}
return str;
}
/* See the comment up above where the #define notend(... is */
#if 0
notend(s)
char *s;
{
if(*s==',') return 0;
if(*s=='{' || *s=='}')
return 0;
if(*s!=':') return 1;
/* This kludge here is for the division cmd, which is a kludge */
if(strchr("aAdD#",s[1])) return 0;
return 1;
}
#endif
/* 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
md_assemble(str)
char *str;
{
char *er;
short *fromP;
char *toP;
int m,n;
char *to_beg_P;
int shorts_this_frag;
bzero((char *)(&the_ins),sizeof(the_ins)); /* JF for paranoia sake */
m68_ip(str);
er=the_ins.error;
if(!er) {
for(n=the_ins.numargs;n;--n)
if(the_ins.operands[n].error) {
er=the_ins.operands[n].error;
break;
}
}
if(er) {
as_bad("\"%s\" -- Statement '%s' ignored",er,str);
return;
}
if(the_ins.nfrag==0) { /* No frag hacking involved; just put it out */
toP=frag_more(2*the_ins.numo);
fromP= &the_ins.opcode[0];
for(m=the_ins.numo;m;--m) {
md_number_to_chars(toP,(long)(*fromP),2);
toP+=2;
fromP++;
}
/* put out symbol-dependent info */
for(m=0;m<the_ins.nrel;m++) {
switch(the_ins.reloc[m].wid) {
case 'B':
n=1;
break;
case 'b':
n=1;
break;
case '3':
n=2;
break;
case 'w':
n=2;
break;
case 'l':
n=4;
break;
default:
as_fatal("Don't know how to figure width of %c in md_assemble()",the_ins.reloc[m].wid);
}
fix_new(frag_now,
(toP-frag_now->fr_literal)-the_ins.numo*2+the_ins.reloc[m].n,
n,
the_ins.reloc[m].add,
the_ins.reloc[m].sub,
the_ins.reloc[m].off,
the_ins.reloc[m].pcrel,
NO_RELOC);
}
return;
}
/* There's some frag hacking */
for(n=0,fromP= &the_ins.opcode[0];n<the_ins.nfrag;n++) {
int wid;
if(n==0) wid=2*the_ins.fragb[n].fragoff;
else wid=2*(the_ins.numo-the_ins.fragb[n-1].fragoff);
toP=frag_more(wid);
to_beg_P=toP;
shorts_this_frag=0;
for(m=wid/2;m;--m) {
md_number_to_chars(toP,(long)(*fromP),2);
toP+=2;
fromP++;
shorts_this_frag++;
}
for(m=0;m<the_ins.nrel;m++) {
if((the_ins.reloc[m].n)>= 2*shorts_this_frag /* 2*the_ins.fragb[n].fragoff */) {
the_ins.reloc[m].n-= 2*shorts_this_frag /* 2*the_ins.fragb[n].fragoff */;
break;
}
wid=the_ins.reloc[m].wid;
if(wid==0)
continue;
the_ins.reloc[m].wid=0;
wid = (wid=='b') ? 1 : (wid=='w') ? 2 : (wid=='l') ? 4 : 4000;
fix_new(frag_now,
(toP-frag_now->fr_literal)-the_ins.numo*2+the_ins.reloc[m].n,
wid,
the_ins.reloc[m].add,
the_ins.reloc[m].sub,
the_ins.reloc[m].off,
the_ins.reloc[m].pcrel,
NO_RELOC);
}
know(the_ins.fragb[n].fadd);
(void)frag_var(rs_machine_dependent,10,0,(relax_substateT)(the_ins.fragb[n].fragty),
the_ins.fragb[n].fadd,the_ins.fragb[n].foff,to_beg_P);
}
n=(the_ins.numo-the_ins.fragb[n-1].fragoff);
shorts_this_frag=0;
if(n) {
toP=frag_more(n*sizeof(short));
while(n--) {
md_number_to_chars(toP,(long)(*fromP),2);
toP+=2;
fromP++;
shorts_this_frag++;
}
}
for(m=0;m<the_ins.nrel;m++) {
int wid;
wid=the_ins.reloc[m].wid;
if(wid==0)
continue;
the_ins.reloc[m].wid=0;
wid = (wid=='b') ? 1 : (wid=='w') ? 2 : (wid=='l') ? 4 : 4000;
fix_new(frag_now,
(the_ins.reloc[m].n + toP-frag_now->fr_literal)-/* the_ins.numo */ shorts_this_frag*2,
wid,
the_ins.reloc[m].add,
the_ins.reloc[m].sub,
the_ins.reloc[m].off,
the_ins.reloc[m].pcrel,
NO_RELOC);
}
}
/* This function is called once, at assembler startup time. This should
set up all the tables, etc that the MD part of the assembler needs
*/
void
md_begin()
{
/*
* md_begin -- set up hash tables with 68000 instructions.
* similar to what the vax assembler does. ---phr
*/
/* RMS claims the thing to do is take the m68k-opcode.h table, and make
a copy of it at runtime, adding in the information we want but isn't
there. I think it'd be better to have an awk script hack the table
at compile time. Or even just xstr the table and use it as-is. But
my lord ghod hath spoken, so we do it this way. Excuse the ugly var
names. */
register const struct m68k_opcode *ins;
register struct m68_incant *hack,
*slak;
register char *retval = 0; /* empty string, or error msg text */
register unsigned int i;
register char c;
if ((op_hash = hash_new()) == NULL)
as_fatal("Virtual memory exhausted");
obstack_begin(&robyn,4000);
for (ins = m68k_opcodes; ins < endop; ins++) {
hack=slak=(struct m68_incant *)obstack_alloc(&robyn,sizeof(struct m68_incant));
do {
slak->m_operands=ins->args;
slak->m_opnum=strlen(slak->m_operands)/2;
slak->m_opcode=ins->opcode;
/* This is kludgey */
slak->m_codenum=((ins->match)&0xffffL) ? 2 : 1;
if((ins+1)!=endop && !strcmp(ins->name,(ins+1)->name)) {
slak->m_next=(struct m68_incant *)
obstack_alloc(&robyn,sizeof(struct m68_incant));
ins++;
} else
slak->m_next=0;
slak=slak->m_next;
} while(slak);
retval = hash_insert (op_hash, ins->name,(char *)hack);
/* Didn't his mommy tell him about null pointers? */
if(retval && *retval)
as_fatal("Internal Error: Can't hash %s: %s", ins->name,retval);
}
for (i = 0; i < sizeof(mklower_table) ; i++)
mklower_table[i] = (isupper(c = (char) i)) ? tolower(c) : c;
for (i = 0 ; i < sizeof(notend_table) ; i++) {
notend_table[i] = 0;
alt_notend_table[i] = 0;
}
notend_table[','] = 1;
notend_table['{'] = 1;
notend_table['}'] = 1;
alt_notend_table['a'] = 1;
alt_notend_table['A'] = 1;
alt_notend_table['d'] = 1;
alt_notend_table['D'] = 1;
alt_notend_table['#'] = 1;
alt_notend_table['f'] = 1;
alt_notend_table['F'] = 1;
#ifdef REGISTER_PREFIX
alt_notend_table[REGISTER_PREFIX] = 1;
#endif
}
#if 0
#define notend(s) ((*s == ',' || *s == '}' || *s == '{' \
|| (*s == ':' && strchr("aAdD#", s[1]))) \
? 0 : 1)
#endif
/* This funciton is called once, before the assembler exits. It is
supposed to do any final cleanup for this part of the assembler.
*/
void
md_end()
{
}
/* 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;
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 ""; /* Someone should teach Dean about null pointers */
}
/* Turn an integer of n bytes (in val) into a stream of bytes appropriate
for use in the a.out file, and stores them in the array pointed to by buf.
This knows about the endian-ness of the target machine and does
THE RIGHT THING, whatever it is. Possible values for n are 1 (byte)
2 (short) and 4 (long) Floating numbers are put out as a series of
LITTLENUMS (shorts, here at least)
*/
void
md_number_to_chars(buf,val,n)
char *buf;
long val;
int n;
{
switch(n) {
case 1:
*buf++=val;
break;
case 2:
*buf++=(val>>8);
*buf++=val;
break;
case 4:
*buf++=(val>>24);
*buf++=(val>>16);
*buf++=(val>>8);
*buf++=val;
break;
default:
abort();
}
}
void
md_apply_fix(fixP, val)
fixS *fixP;
long val;
{
char *buf = fixP->fx_where + fixP->fx_frag->fr_literal;
switch(fixP->fx_size) {
case 1:
*buf++=val;
break;
case 2:
*buf++=(val>>8);
*buf++=val;
break;
case 4:
*buf++=(val>>24);
*buf++=(val>>16);
*buf++=(val>>8);
*buf++=val;
break;
default:
BAD_CASE (fixP->fx_size);
}
}
/* *fragP has been relaxed to its final size, and now needs to have
the bytes inside it modified to conform to the new size There is UGLY
MAGIC here. ..
*/
void
md_convert_frag(fragP)
register fragS *fragP;
{
long disp;
long ext;
/* Address in gas core of the place to store the displacement. */
register char *buffer_address = fragP -> fr_fix + fragP -> fr_literal;
/* Address in object code of the displacement. */
register int object_address = fragP -> fr_fix + fragP -> fr_address;
know(fragP->fr_symbol);
/* The displacement of the address, from current location. */
disp = (S_GET_VALUE(fragP->fr_symbol) + fragP->fr_offset) - object_address;
switch(fragP->fr_subtype) {
case TAB(BCC68000,BYTE):
case TAB(BRANCH,BYTE):
know(issbyte(disp));
if(disp==0)
as_bad("short branch with zero offset: use :w");
fragP->fr_opcode[1]=disp;
ext=0;
break;
case TAB(DBCC,SHORT):
know(issword(disp));
ext=2;
break;
case TAB(BCC68000,SHORT):
case TAB(BRANCH,SHORT):
know(issword(disp));
fragP->fr_opcode[1]=0x00;
ext=2;
break;
case TAB(BRANCH,LONG):
if(flagseen['m']) {
if(fragP->fr_opcode[0]==0x61) {
fragP->fr_opcode[0]= 0x4E;
fragP->fr_opcode[1]= 0xB9; /* JSR with ABSL LONG offset */
subseg_change(SEG_TEXT, 0);
fix_new(fragP,
fragP->fr_fix,
4,
fragP->fr_symbol,
0,
fragP->fr_offset,
0,
NO_RELOC);
fragP->fr_fix+=4;
ext=0;
} else if(fragP->fr_opcode[0]==0x60) {
fragP->fr_opcode[0]= 0x4E;
fragP->fr_opcode[1]= 0xF9; /* JMP with ABSL LONG offset */
subseg_change(SEG_TEXT, 0);
fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix+=4;
ext=0;
}else {
as_bad("Long branch offset not supported.");
}
} else {
fragP->fr_opcode[1]=0xff;
ext=4;
}
break;
case TAB(BCC68000,LONG):
/* only Bcc 68000 instructions can come here */
/* change bcc into b!cc/jmp absl long */
fragP->fr_opcode[0] ^= 0x01; /* invert bcc */
fragP->fr_opcode[1] = 0x6; /* branch offset = 6 */
/* JF: these used to be fr_opcode[2,3], but they may be in a
different frag, in which case refering to them is a no-no.
Only fr_opcode[0,1] are guaranteed to work. */
*buffer_address++ = 0x4e; /* put in jmp long (0x4ef9) */
*buffer_address++ = 0xf9;
fragP->fr_fix += 2; /* account for jmp instruction */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0,
fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix += 4;
ext=0;
break;
case TAB(DBCC,LONG):
/* only DBcc 68000 instructions can come here */
/* change dbcc into dbcc/jmp absl long */
/* JF: these used to be fr_opcode[2-7], but that's wrong */
*buffer_address++ = 0x00; /* branch offset = 4 */
*buffer_address++ = 0x04;
*buffer_address++ = 0x60; /* put in bra pc+6 */
*buffer_address++ = 0x06;
*buffer_address++ = 0x4e; /* put in jmp long (0x4ef9) */
*buffer_address++ = 0xf9;
fragP->fr_fix += 6; /* account for bra/jmp instructions */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0,
fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix += 4;
ext=0;
break;
case TAB(FBRANCH,SHORT):
know((fragP->fr_opcode[1]&0x40)==0);
ext=2;
break;
case TAB(FBRANCH,LONG):
fragP->fr_opcode[1]|=0x40; /* Turn on LONG bit */
ext=4;
break;
case TAB(PCREL,SHORT):
ext=2;
break;
case TAB(PCREL,LONG):
/* FIXME-SOMEDAY, this should allow pcrel-long to be generated if -pic is on.
Else we can't handle position independent code. Pcrel-long costs an
extra index word though. Doing it requires more relax tables and
stuff elsewhere in this module though. */
/* The thing to do here is force it to ABSOLUTE LONG, since
PCREL is really trying to shorten an ABSOLUTE address anyway */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0, fragP->fr_offset, 0,
NO_RELOC);
if((fragP->fr_opcode[1] & 0x3F) != 0x3A)
as_bad("Internal error (long PC-relative operand) for insn 0x%04lx at 0x%lx",
fragP->fr_opcode[0],fragP->fr_address);
fragP->fr_opcode[1]&= ~0x3F;
fragP->fr_opcode[1]|=0x39; /* Mode 7.1 */
fragP->fr_fix+=4;
ext=0;
break;
case TAB(PCLEA,SHORT):
subseg_change(SEG_TEXT,0);
fix_new(fragP,(int)(fragP->fr_fix),2,fragP->fr_symbol,(symbolS *)0,fragP->fr_offset,1,
NO_RELOC);
fragP->fr_opcode[1] &= ~0x3F;
fragP->fr_opcode[1] |= 0x3A;
ext=2;
break;
case TAB(PCLEA,LONG):
subseg_change(SEG_TEXT,0);
fix_new(fragP,(int)(fragP->fr_fix)+2,4,fragP->fr_symbol,(symbolS *)0,fragP->fr_offset+2,1,
NO_RELOC);
*buffer_address++ = 0x01;
*buffer_address++ = 0x70;
fragP->fr_fix+=2;
/* buffer_address+=2; */
ext=4;
break;
}
if(ext) {
md_number_to_chars(buffer_address,(long)disp,(int)ext);
fragP->fr_fix+=ext;
}
}
/* Force truly undefined symbols to their maximum size, and generally set up
the frag list to be relaxed
*/
int md_estimate_size_before_relax(fragP, segment)
register fragS *fragP;
segT segment;
{
int old_fix;
register char *buffer_address = fragP -> fr_fix + fragP -> fr_literal;
old_fix=fragP->fr_fix;
/* handle SZ_UNDEF first, it can be changed to BYTE or SHORT */
switch(fragP->fr_subtype) {
case TAB(BRANCH,SZ_UNDEF):
if(S_GET_SEGMENT(fragP->fr_symbol) == segment) {
/* Symbol now defined; start at byte-size. */
fragP->fr_subtype=TAB(TABTYPE(fragP->fr_subtype),BYTE);
break;
} else if(!flagseen['p'] || (!flagseen['l'] && flagseen['m'])) {
/* Symbol in another segment, or undef.
If we don't care about position independent code,
or if we're using long displacements on a 68000,
rewrite to short or long absolute. */
if(fragP->fr_opcode[0]==0x61) {
if(flagseen['l']) {
fragP->fr_opcode[0]= 0x4E;
fragP->fr_opcode[1]= 0xB9; /* JBSR with ABSL WORD offset */
subseg_change(SEG_TEXT, 0);
fix_new(fragP, fragP->fr_fix, 2,
fragP->fr_symbol, 0, fragP->fr_offset, 0,
NO_RELOC);
fragP->fr_fix+=2;
} else {
fragP->fr_opcode[0]= 0x4E;
fragP->fr_opcode[1]= 0xB9; /* JBSR with ABSL LONG offset */
subseg_change(SEG_TEXT, 0);
fix_new(fragP, fragP->fr_fix, 4,
fragP->fr_symbol, 0, fragP->fr_offset, 0,
NO_RELOC);
fragP->fr_fix+=4;
}
frag_wane(fragP);
} else if(fragP->fr_opcode[0]==0x60) {
if(flagseen['l']) {
fragP->fr_opcode[0]= 0x4E;
fragP->fr_opcode[1]= 0xF8; /* JMP with ABSL WORD offset */
subseg_change(SEG_TEXT, 0);
fix_new(fragP, fragP->fr_fix, 2,
fragP->fr_symbol, 0, fragP->fr_offset, 0,
NO_RELOC);
fragP->fr_fix+=2;
} else {
fragP->fr_opcode[0]= 0x4E;
fragP->fr_opcode[1]= 0xF9; /* JMP with ABSL LONG offset */
subseg_change(SEG_TEXT, 0);
fix_new(fragP, fragP->fr_fix, 4,
fragP->fr_symbol, 0, fragP->fr_offset, 0,
NO_RELOC);
fragP->fr_fix+=4;
}
frag_wane(fragP);
} else {
as_bad("Long branch offset to extern symbol not supported.");
}
} else if(flagseen['l']) {
/* Symbol in other seg or undefined, and user
wants short pcrel offsets (-l). Set size to 2, fix
pcrel displacement after relax. */
fix_new(fragP,(int)(fragP->fr_fix),2,fragP->fr_symbol,
(symbolS *)0,fragP->fr_offset+2,1,
NO_RELOC);
fragP->fr_fix+=2;
fragP->fr_opcode[1]=0x00;
frag_wane(fragP);
} else {
/* Symbol in other seg or undefined, and user
wants long pcrel offsets. Set size to 4, and fix
pcrel displacement after relax. */
fix_new(fragP,(int)(fragP->fr_fix),4,fragP->fr_symbol,
(symbolS *)0,fragP->fr_offset + 4,1,
NO_RELOC);
fragP->fr_fix+=4;
fragP->fr_opcode[1]=0xff;
frag_wane(fragP);
break;
}
break;
case TAB(FBRANCH,SZ_UNDEF):
if(S_GET_SEGMENT(fragP->fr_symbol) == segment
|| flagseen['l']) {
fragP->fr_subtype=TAB(FBRANCH,SHORT);
fragP->fr_var+=2;
} else {
fragP->fr_subtype=TAB(FBRANCH,LONG);
fragP->fr_var+=4;
}
break;
case TAB(PCREL,SZ_UNDEF):
if(S_GET_SEGMENT(fragP->fr_symbol) == segment
|| flagseen['l']) {
fragP->fr_subtype=TAB(PCREL,SHORT);
fragP->fr_var+=2;
} else {
fragP->fr_subtype=TAB(PCREL,LONG);
fragP->fr_var+=4;
}
break;
case TAB(BCC68000,SZ_UNDEF):
if(S_GET_SEGMENT(fragP->fr_symbol) == segment) {
fragP->fr_subtype=TAB(BCC68000,BYTE);
break;
}
/* only Bcc 68000 instructions can come here */
/* change bcc into b!cc/jmp absl long */
fragP->fr_opcode[0] ^= 0x01; /* invert bcc */
if(flagseen['l']) {
fragP->fr_opcode[1] = 0x04; /* branch offset = 6 */
/* JF: these were fr_opcode[2,3] */
buffer_address[0] = 0x4e; /* put in jmp long (0x4ef9) */
buffer_address[1] = 0xf8;
fragP->fr_fix += 2; /* account for jmp instruction */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 2, fragP->fr_symbol, 0,
fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix += 2;
} else {
fragP->fr_opcode[1] = 0x06; /* branch offset = 6 */
/* JF: these were fr_opcode[2,3] */
buffer_address[2] = 0x4e; /* put in jmp long (0x4ef9) */
buffer_address[3] = 0xf9;
fragP->fr_fix += 2; /* account for jmp instruction */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0,
fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix += 4;
}
frag_wane(fragP);
break;
case TAB(DBCC,SZ_UNDEF):
if(S_GET_SEGMENT(fragP->fr_symbol) == segment) {
fragP->fr_subtype=TAB(DBCC,SHORT);
fragP->fr_var+=2;
break;
}
/* only DBcc 68000 instructions can come here */
/* change dbcc into dbcc/jmp absl long */
/* JF: these used to be fr_opcode[2-4], which is wrong. */
buffer_address[0] = 0x00; /* branch offset = 4 */
buffer_address[1] = 0x04;
buffer_address[2] = 0x60; /* put in bra pc + ... */
if(flagseen['l']) {
/* JF: these were fr_opcode[5-7] */
buffer_address[3] = 0x04; /* plus 4 */
buffer_address[4] = 0x4e;/* Put in Jump Word */
buffer_address[5] = 0xf8;
fragP->fr_fix += 6; /* account for bra/jmp instruction */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 2, fragP->fr_symbol, 0,
fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix+=2;
} else {
/* JF: these were fr_opcode[5-7] */
buffer_address[3] = 0x06; /* Plus 6 */
buffer_address[4] = 0x4e; /* put in jmp long (0x4ef9) */
buffer_address[5] = 0xf9;
fragP->fr_fix += 6; /* account for bra/jmp instruction */
subseg_change(SEG_TEXT,0);
fix_new(fragP, fragP->fr_fix, 4, fragP->fr_symbol, 0,
fragP->fr_offset,0,
NO_RELOC);
fragP->fr_fix += 4;
}
frag_wane(fragP);
break;
case TAB(PCLEA,SZ_UNDEF):
if((S_GET_SEGMENT(fragP->fr_symbol))==segment || flagseen['l']) {
fragP->fr_subtype=TAB(PCLEA,SHORT);
fragP->fr_var+=2;
} else {
fragP->fr_subtype=TAB(PCLEA,LONG);
fragP->fr_var+=6;
}
break;
default:
break;
}
/* now that SZ_UNDEF are taken care of, check others */
switch(fragP->fr_subtype) {
case TAB(BCC68000,BYTE):
case TAB(BRANCH,BYTE):
/* We can't do a short jump to the next instruction,
so we force word mode. */
if(fragP->fr_symbol && S_GET_VALUE(fragP->fr_symbol)==0 &&
fragP->fr_symbol->sy_frag==fragP->fr_next) {
fragP->fr_subtype=TAB(TABTYPE(fragP->fr_subtype),SHORT);
fragP->fr_var+=2;
}
break;
default:
break;
}
return fragP->fr_var + fragP->fr_fix - old_fix;
}
#if defined(OBJ_AOUT) | defined(OBJ_BOUT)
/* the bit-field entries in the relocation_info struct plays hell
with the byte-order problems of cross-assembly. So as a hack,
I added this mach. dependent ri twiddler. Ugly, but it gets
you there. -KWK */
/* on m68k: first 4 bytes are normal unsigned long, next three bytes
are symbolnum, most sig. byte first. Last byte is broken up with
bit 7 as pcrel, bits 6 & 5 as length, bit 4 as pcrel, and the lower
nibble as nuthin. (on Sun 3 at least) */
/* Translate the internal relocation information into target-specific
format. */
void
md_ri_to_chars(the_bytes, ri)
char *the_bytes;
struct reloc_info_generic *ri;
{
/* this is easy */
md_number_to_chars(the_bytes, ri->r_address, 4);
/* now the fun stuff */
the_bytes[4] = (ri->r_symbolnum >> 16) & 0x0ff;
the_bytes[5] = (ri->r_symbolnum >> 8) & 0x0ff;
the_bytes[6] = ri->r_symbolnum & 0x0ff;
the_bytes[7] = (((ri->r_pcrel << 7) & 0x80) | ((ri->r_length << 5) & 0x60) |
((ri->r_extern << 4) & 0x10));
}
#endif /* OBJ_AOUT or OBJ_BOUT */
#ifndef WORKING_DOT_WORD
const int md_short_jump_size = 4;
const int md_long_jump_size = 6;
void
md_create_short_jump(ptr,from_addr,to_addr,frag,to_symbol)
char *ptr;
long from_addr,
to_addr;
fragS *frag;
symbolS *to_symbol;
{
long offset;
offset = to_addr - (from_addr+2);
md_number_to_chars(ptr ,(long)0x6000,2);
md_number_to_chars(ptr+2,(long)offset,2);
}
void
md_create_long_jump(ptr,from_addr,to_addr,frag,to_symbol)
char *ptr;
long from_addr,
to_addr;
fragS *frag;
symbolS *to_symbol;
{
long offset;
if(flagseen['m']) {
offset=to_addr-S_GET_VALUE(to_symbol);
md_number_to_chars(ptr ,(long)0x4EF9,2);
md_number_to_chars(ptr+2,(long)offset,4);
fix_new(frag,(ptr+2)-frag->fr_literal,4,to_symbol,(symbolS *)0,(long)0,0,
NO_RELOC);
} else {
offset=to_addr - (from_addr+2);
md_number_to_chars(ptr ,(long)0x60ff,2);
md_number_to_chars(ptr+2,(long)offset,4);
}
}
#endif
/* Different values of OK tell what its OK to return. Things that aren't OK are an error (what a shock, no?)
0: Everything is OK
10: Absolute 1:8 only
20: Absolute 0:7 only
30: absolute 0:15 only
40: Absolute 0:31 only
50: absolute 0:127 only
55: absolute -64:63 only
60: absolute -128:127 only
70: absolute 0:4095 only
80: No bignums
*/
static int get_num(exp,ok)
struct m68k_exp *exp;
int ok;
{
#ifdef TEST2
long l = 0;
if(!exp->e_beg)
return 0;
if(*exp->e_beg=='0') {
if(exp->e_beg[1]=='x')
sscanf(exp->e_beg+2,"%x",&l);
else
sscanf(exp->e_beg+1,"%O",&l);
return l;
}
return atol(exp->e_beg);
#else
char *save_in;
char c_save;
if(!exp) {
/* Can't do anything */
return 0;
}
if(!exp->e_beg || !exp->e_end) {
seg(exp)=SEG_ABSOLUTE;
adds(exp)=0;
subs(exp)=0;
offs(exp)= (ok==10) ? 1 : 0;
as_bad("Null expression defaults to %ld", offs(exp));
return 0;
}
exp->e_siz=0;
if(/* ok!=80 && */exp->e_end[-1]==':' && (exp->e_end-exp->e_beg)>=2) {
switch(exp->e_end[0]) {
case 's':
case 'S':
case 'b':
case 'B':
exp->e_siz=1;
break;
case 'w':
case 'W':
exp->e_siz=2;
break;
case 'l':
case 'L':
exp->e_siz=3;
break;
default:
as_bad("Unknown size for expression \"%c\"", exp->e_end[0]);
}
exp->e_end-=2;
}
c_save=exp->e_end[1];
exp->e_end[1]='\0';
save_in=input_line_pointer;
input_line_pointer=exp->e_beg;
switch(expression(&(exp->e_exp))) {
case SEG_PASS1:
seg(exp)=SEG_ABSOLUTE;
adds(exp)=0;
subs(exp)=0;
offs(exp)= (ok==10) ? 1 : 0;
as_bad("Unknown expression: '%s' defaulting to %d",exp->e_beg,offs(exp));
break;
case SEG_ABSENT:
/* Do the same thing the VAX asm does */
seg(exp)=SEG_ABSOLUTE;
adds(exp)=0;
subs(exp)=0;
offs(exp)=0;
if(ok==10) {
as_bad("expression out of range: defaulting to 1");
offs(exp)=1;
}
break;
case SEG_ABSOLUTE:
switch(ok) {
case 10:
if(offs(exp)<1 || offs(exp)>8) {
as_bad("expression out of range: defaulting to 1");
offs(exp)=1;
}
break;
case 20:
if(offs(exp)<0 || offs(exp)>7)
goto outrange;
break;
case 30:
if(offs(exp)<0 || offs(exp)>15)
goto outrange;
break;
case 40:
if(offs(exp)<0 || offs(exp)>32)
goto outrange;
break;
case 50:
if(offs(exp)<0 || offs(exp)>127)
goto outrange;
break;
case 55:
if(offs(exp)<-64 || offs(exp)>63)
goto outrange;
break;
case 60:
if(offs(exp)<-128 || offs(exp)>127)
goto outrange;
break;
case 70:
if(offs(exp)<0 || offs(exp)>4095) {
outrange:
as_bad("expression out of range: defaulting to 0");
offs(exp)=0;
}
break;
default:
break;
}
break;
case SEG_TEXT:
case SEG_DATA:
case SEG_BSS:
case SEG_UNKNOWN:
case SEG_DIFFERENCE:
if(ok>=10 && ok<=70) {
seg(exp)=SEG_ABSOLUTE;
adds(exp)=0;
subs(exp)=0;
offs(exp)= (ok==10) ? 1 : 0;
as_bad("Can't deal with expression \"%s\": defaulting to %ld",exp->e_beg,offs(exp));
}
break;
case SEG_BIG:
if(ok==80 && offs(exp)<0) { /* HACK! Turn it into a long */
LITTLENUM_TYPE words[6];
gen_to_words(words,2,8L);/* These numbers are magic! */
seg(exp)=SEG_ABSOLUTE;
adds(exp)=0;
subs(exp)=0;
offs(exp)=words[1]|(words[0]<<16);
} else if(ok!=0) {
seg(exp)=SEG_ABSOLUTE;
adds(exp)=0;
subs(exp)=0;
offs(exp)= (ok==10) ? 1 : 0;
as_bad("Can't deal with expression \"%s\": defaulting to %ld",exp->e_beg,offs(exp));
}
break;
default:
abort();
}
if(input_line_pointer!=exp->e_end+1)
as_bad("Ignoring junk after expression");
exp->e_end[1]=c_save;
input_line_pointer=save_in;
if(exp->e_siz) {
switch(exp->e_siz) {
case 1:
if(!isbyte(offs(exp)))
as_bad("expression doesn't fit in BYTE");
break;
case 2:
if(!isword(offs(exp)))
as_bad("expression doesn't fit in WORD");
break;
}
}
return offs(exp);
#endif
} /* get_num() */
/* These are the back-ends for the various machine dependent pseudo-ops. */
static void s_data1() {
subseg_new(SEG_DATA,1);
demand_empty_rest_of_line();
} /* s_data1() */
static void s_data2() {
subseg_new(SEG_DATA,2);
demand_empty_rest_of_line();
} /* s_data2() */
static void s_bss() {
/* We don't support putting frags in the BSS segment, but we
can put them into initialized data for now... */
subseg_new(SEG_DATA,255); /* FIXME-SOON */
demand_empty_rest_of_line();
} /* s_bss() */
static void s_even() {
register int temp;
register long temp_fill;
temp = 1; /* JF should be 2? */
temp_fill = get_absolute_expression ();
if ( ! need_pass_2 ) /* Never make frag if expect extra pass. */
frag_align (temp, (int)temp_fill);
demand_empty_rest_of_line();
} /* s_even() */
static void s_proc() {
demand_empty_rest_of_line();
} /* s_proc() */
/* s_space is defined in read.c .skip is simply an alias to it. */
int
md_parse_option(argP,cntP,vecP)
char **argP;
int *cntP;
char ***vecP;
{
switch(**argP) {
case 'l': /* -l means keep externals to 2 byte branch offsets
rather than 4 byte branch offsets */
break;
case 'm':
/* Gas almost ignores this option! */
(*argP)++;
if(**argP=='c')
(*argP)++;
if(!strcmp(*argP,"68000"))
flagseen['m']=2;
else if(!strcmp(*argP,"68010")) {
#ifdef TE_SUN
magic_number_for_object_file = 1<<16|OMAGIC;
#endif
flagseen['m']=1;
} else if(!strcmp(*argP,"68020"))
flagseen['m']=0;
else
as_warn("Unknown -m option ignored");
while(**argP)
(*argP)++;
break;
case 'p':
if (!strcmp(*argP,"pic")) {
(*argP) += 3;
break; /* -pic, Position Independent Code */
}
else
return 0;
default:
return 0;
}
return 1;
}
#ifdef TEST2
/* TEST2: Test md_assemble() */
/* Warning, this routine probably doesn't work anymore */
main()
{
struct m68_it the_ins;
char buf[120];
char *cp;
int n;
m68_ip_begin();
for(;;) {
if(!gets(buf) || !*buf)
break;
if(buf[0]=='|' || buf[1]=='.')
continue;
for(cp=buf;*cp;cp++)
if(*cp=='\t')
*cp=' ';
if(is_label(buf))
continue;
bzero(&the_ins,sizeof(the_ins));
m68_ip(&the_ins,buf);
if(the_ins.error) {
printf("Error %s in %s\n",the_ins.error,buf);
} else {
printf("Opcode(%d.%s): ",the_ins.numo,the_ins.args);
for(n=0;n<the_ins.numo;n++)
printf(" 0x%x",the_ins.opcode[n]&0xffff);
printf(" ");
print_the_insn(&the_ins.opcode[0],stdout);
(void)putchar('\n');
}
for(n=0;n<strlen(the_ins.args)/2;n++) {
if(the_ins.operands[n].error) {
printf("op%d Error %s in %s\n",n,the_ins.operands[n].error,buf);
continue;
}
printf("mode %d, reg %d, ",the_ins.operands[n].mode,the_ins.operands[n].reg);
if(the_ins.operands[n].b_const)
printf("Constant: '%.*s', ",1+the_ins.operands[n].e_const-the_ins.operands[n].b_const,the_ins.operands[n].b_const);
printf("ireg %d, isiz %d, imul %d, ",the_ins.operands[n].ireg,the_ins.operands[n].isiz,the_ins.operands[n].imul);
if(the_ins.operands[n].b_iadd)
printf("Iadd: '%.*s',",1+the_ins.operands[n].e_iadd-the_ins.operands[n].b_iadd,the_ins.operands[n].b_iadd);
(void)putchar('\n');
}
}
m68_ip_end();
return 0;
}
is_label(str)
char *str;
{
while(*str==' ')
str++;
while(*str && *str!=' ')
str++;
if(str[-1]==':' || str[1]=='=')
return 1;
return 0;
}
#endif
/* Possible states for relaxation:
0 0 branch offset byte (bra, etc)
0 1 word
0 2 long
1 0 indexed offsets byte a0@(32,d4:w:1) etc
1 1 word
1 2 long
2 0 two-offset index word-word a0@(32,d4)@(45) etc
2 1 word-long
2 2 long-word
2 3 long-long
*/
#ifdef DONTDEF
abort()
{
printf("ABORT!\n");
exit(12);
}
char *index(s,c)
char *s;
{
while(*s!=c) {
if(!*s) return 0;
s++;
}
return s;
}
bzero(s,n)
char *s;
{
while(n--)
*s++=0;
}
print_frags()
{
fragS *fragP;
extern fragS *text_frag_root;
for(fragP=text_frag_root;fragP;fragP=fragP->fr_next) {
printf("addr %lu next 0x%x fix %ld var %ld symbol 0x%x offset %ld\n",
fragP->fr_address,fragP->fr_next,fragP->fr_fix,fragP->fr_var,fragP->fr_symbol,fragP->fr_offset);
printf("opcode 0x%x type %d subtype %d\n\n",fragP->fr_opcode,fragP->fr_type,fragP->fr_subtype);
}
fflush(stdout);
return 0;
}
#endif
#ifdef DONTDEF
/*VARARGS1*/
panic(format,args)
char *format;
{
fputs("Internal error:",stderr);
_doprnt(format,&args,stderr);
(void)putc('\n',stderr);
as_where();
abort();
}
#endif
/* We have no need to default values of symbols. */
/* ARGSUSED */
symbolS *
md_undefined_symbol (name)
char *name;
{
return 0;
}
/* Parse an operand that is machine-specific.
We just return without modifying the expression if we have nothing
to do. */
/* ARGSUSED */
void
md_operand (expressionP)
expressionS *expressionP;
{
}
/* Round up a section size to the appropriate boundary. */
long
md_section_align (segment, size)
segT segment;
long size;
{
return size; /* Byte alignment is fine */
}
/* Exactly what point is a PC-relative offset relative TO?
On the 68k, they're relative to the address of the offset, plus
its size. (??? Is this right? FIXME-SOON!) */
long
md_pcrel_from (fixP)
fixS *fixP;
{
return fixP->fx_size + fixP->fx_where + fixP->fx_frag->fr_address;
}
/* Opcode table for m68000/m68020 and m68881.
Copyright (C) 1989, Free Software Foundation.
This file is part of GDB, the GNU Debugger and GAS, the GNU Assembler.
Both GDB and GAS are free software; you can redistribute and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
GDB and GAS are 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 GDB or GAS; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
/* We store four bytes of opcode for all opcodes because that
is the most any of them need. The actual length of an instruction
is always at least 2 bytes, and is as much longer as necessary to
hold the operands it has.
The match component is a mask saying which bits must match
particular opcode in order for an instruction to be an instance
of that opcode.
The args component is a string containing two characters
for each operand of the instruction. The first specifies
the kind of operand; the second, the place it is stored. */
/* Kinds of operands:
D data register only. Stored as 3 bits.
A address register only. Stored as 3 bits.
R either kind of register. Stored as 4 bits.
F floating point coprocessor register only. Stored as 3 bits.
O an offset (or width): immediate data 0-31 or data register.
Stored as 6 bits in special format for BF... insns.
+ autoincrement only. Stored as 3 bits (number of the address register).
- autodecrement only. Stored as 3 bits (number of the address register).
Q quick immediate data. Stored as 3 bits.
This matches an immediate operand only when value is in range 1 .. 8.
M moveq immediate data. Stored as 8 bits.
This matches an immediate operand only when value is in range -128..127
T trap vector immediate data. Stored as 4 bits.
k K-factor for fmove.p instruction. Stored as a 7-bit constant or
a three bit register offset, depending on the field type.
# immediate data. Stored in special places (b, w or l)
which say how many bits to store.
^ immediate data for floating point instructions. Special places
are offset by 2 bytes from '#'...
B pc-relative address, converted to an offset
that is treated as immediate data.
d displacement and register. Stores the register as 3 bits
and stores the displacement in the entire second word.
C the CCR. No need to store it; this is just for filtering validity.
S the SR. No need to store, just as with CCR.
U the USP. No need to store, just as with CCR.
I Coprocessor ID. Not printed if 1. The Coprocessor ID is always
extracted from the 'd' field of word one, which means that an extended
coprocessor opcode can be skipped using the 'i' place, if needed.
s System Control register for the floating point coprocessor.
S List of system control registers for floating point coprocessor.
J Misc register for movec instruction, stored in 'j' format.
Possible values:
000 SFC Source Function Code reg
001 DFC Data Function Code reg
002 CACR Cache Control Register
800 USP User Stack Pointer
801 VBR Vector Base reg
802 CAAR Cache Address Register
803 MSP Master Stack Pointer
804 ISP Interrupt Stack Pointer
L Register list of the type d0-d7/a0-a7 etc.
(New! Improved! Can also hold fp0-fp7, as well!)
The assembler tries to see if the registers match the insn by
looking at where the insn wants them stored.
l Register list like L, but with all the bits reversed.
Used for going the other way. . .
They are all stored as 6 bits using an address mode and a register number;
they differ in which addressing modes they match.
* all (modes 0-6,7.*)
~ alterable memory (modes 2-6,7.0,7.1)(not 0,1,7.~)
% alterable (modes 0-6,7.0,7.1)(not 7.~)
; data (modes 0,2-6,7.*)(not 1)
@ data, but not immediate (modes 0,2-6,7.? ? ?)(not 1,7.?) This may really be ;, the 68020 book says it is
! control (modes 2,5,6,7.*-)(not 0,1,3,4,7.4)
& alterable control (modes 2,5,6,7.0,7.1)(not 0,1,7.? ? ?)
$ alterable data (modes 0,2-6,7.0,7.1)(not 1,7.~)
? alterable control, or data register (modes 0,2,5,6,7.0,7.1)(not 1,3,4,7.~)
/ control, or data register (modes 0,2,5,6,7.0,7.1,7.2,7.3)(not 1,3,4,7.4)
*/
/* JF: for the 68851 */
/*
I didn't use much imagination in choosing the
following codes, so many of them aren't very
mnemonic. -rab
P pmmu register
Possible values:
000 TC Translation Control reg
100 CAL Current Access Level
101 VAL Validate Access Level
110 SCC Stack Change Control
111 AC Access Control
W wide pmmu registers
Possible values:
001 DRP Dma Root Pointer
010 SRP Supervisor Root Pointer
011 CRP Cpu Root Pointer
f function code register
0 SFC
1 DFC
V VAL register only
X BADx, BACx
100 BAD Breakpoint Acknowledge Data
101 BAC Breakpoint Acknowledge Control
Y PSR
Z PCSR
| memory (modes 2-6, 7.*)
*/
/* Places to put an operand, for non-general operands:
s source, low bits of first word.
d dest, shifted 9 in first word
1 second word, shifted 12
2 second word, shifted 6
3 second word, shifted 0
4 third word, shifted 12
5 third word, shifted 6
6 third word, shifted 0
7 second word, shifted 7
8 second word, shifted 10
D store in both place 1 and place 3; for divul and divsl.
b second word, low byte
w second word (entire)
l second and third word (entire)
g branch offset for bra and similar instructions.
The place to store depends on the magnitude of offset.
t store in both place 7 and place 8; for floating point operations
c branch offset for cpBcc operations.
The place to store is word two if bit six of word one is zero,
and words two and three if bit six of word one is one.
i Increment by two, to skip over coprocessor extended operands. Only
works with the 'I' format.
k Dynamic K-factor field. Bits 6-4 of word 2, used as a register number.
Also used for dynamic fmovem instruction.
C floating point coprocessor constant - 7 bits. Also used for static
K-factors...
j Movec register #, stored in 12 low bits of second word.
Places to put operand, for general operands:
d destination, shifted 6 bits in first word
b source, at low bit of first word, and immediate uses one byte
w source, at low bit of first word, and immediate uses two bytes
l source, at low bit of first word, and immediate uses four bytes
s source, at low bit of first word.
Used sometimes in contexts where immediate is not allowed anyway.
f single precision float, low bit of 1st word, immediate uses 4 bytes
F double precision float, low bit of 1st word, immediate uses 8 bytes
x extended precision float, low bit of 1st word, immediate uses 12 bytes
p packed float, low bit of 1st word, immediate uses 12 bytes
*/
#define one(x) ((x) << 16)
#define two(x, y) (((x) << 16) + y)
/*
* Local Variables:
* comment-column: 0
* fill-column: 131
* End:
*/
/* end of tc-m68k.c */
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