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BSD 4_3_Reno development
[unix-history] / .ref-BSD-4_3_Tahoe / usr / src / sys / vax / kdb_opset.c
/*
* @(#)kdb_opset.c 7.3 (Berkeley) 5/26/88
*/
#include "../kdb/defs.h"
/*
* Instruction printing.
*/
REGLIST reglist [] = {
"p1lr", &pcb.pcb_p1lr, "p1br", (int *)&pcb.pcb_p1br,
"p0lr", &pcb.pcb_p0lr, "p0br", (int *)&pcb.pcb_p0br,
"ksp", &pcb.pcb_ksp, "esp", &pcb.pcb_esp,
"ssp", &pcb.pcb_ssp, "psl", &pcb.pcb_psl,
"pc", &pcb.pcb_pc, "usp", &pcb.pcb_usp,
"fp", &pcb.pcb_fp, "ap", &pcb.pcb_ap,
"r11", &pcb.pcb_r11, "r10", &pcb.pcb_r10,
"r9", &pcb.pcb_r9, "r8", &pcb.pcb_r8,
"r7", &pcb.pcb_r7, "r6", &pcb.pcb_r6,
"r5", &pcb.pcb_r5, "r4", &pcb.pcb_r4,
"r3", &pcb.pcb_r3, "r2", &pcb.pcb_r2,
"r1", &pcb.pcb_r1, "r0", &pcb.pcb_r0,
};
/*
* Argument data types
*
* If you change these definitions, you must also change the tables
* in assizetab.c
*/
#define TYPB 000 /* byte integer */
#define TYPW 001 /* word integer */
#define TYPL 002 /* long integer */
#define TYPQ 003 /* quad integer */
#define TYPO 004 /* octa integer */
#define TYPF 005 /* F float */
#define TYPD 006 /* D float */
#define TYPG 007 /* G float */
#define TYPH 010 /* H float */
#define TYPUNPACKED 011 /* when unpacked into mantissa & exponent */
#define TYPNONE 012 /* when nothing */
#define TYPLG 4 /* number of bits the above take up */
#define TYPMASK ((1<<TYPLG)-1) /* the mask (assumes 2's comp arith) */
/*
* Constructors and extractors for argument access kinds and types
*/
#define A_CONS(access, type) ((access) | (type))
#define A_ACCEXT(consed) ((consed) & (TYPMASK << TYPLG))
#define A_TYPEXT(consed) ((consed) & TYPMASK)
/*
* Argument access types used to test validity of operands to operators
*/
#define ACCR (1<<TYPLG) /* read */
#define ACCW (2<<TYPLG) /* write */
#define ACCB (4<<TYPLG) /* branch displacement */
#define ACCA (8<<TYPLG) /* address only */
#define ACCV (8<<TYPLG) /* address only */
#define ACCM (ACCR | ACCW) /* modify */
#define ACCI (ACCB | ACCR) /* XFC code */
#define ACCESSMASK (ACCA | ACCR | ACCW | ACCB) /* the mask */
/*
* Construction of TYPX and ACCX, to make the instrs table
* easy to use and read.
*/
/*
* For real memory address
*/
#define A_AB A_CONS(ACCA, TYPB)
#define A_AW A_CONS(ACCA, TYPW)
#define A_AL A_CONS(ACCA, TYPL)
#define A_AQ A_CONS(ACCA, TYPQ)
#define A_AO A_CONS(ACCA, TYPO)
#define A_AF A_CONS(ACCA, TYPF)
#define A_AD A_CONS(ACCA, TYPD)
#define A_AG A_CONS(ACCA, TYPG)
#define A_AH A_CONS(ACCA, TYPH)
/*
* For real memory addresses, or register addresses [sic]
*
* CHEAT! we just call these read access, since
* registers are allowed. All field instruction, except insv,
* are are read access fields.
*/
#define A_VB A_CONS(ACCR, TYPB)
#define A_VW A_CONS(ACCR, TYPW)
#define A_VL A_CONS(ACCR, TYPL)
#define A_VQ A_CONS(ACCR, TYPQ)
#define A_VO A_CONS(ACCR, TYPO)
#define A_VF A_CONS(ACCR, TYPF)
#define A_VD A_CONS(ACCR, TYPD)
#define A_VG A_CONS(ACCR, TYPG)
#define A_VH A_CONS(ACCR, TYPH)
/*
* For branch displacement
*/
#define A_BB A_CONS(ACCB, TYPB)
#define A_BW A_CONS(ACCB, TYPW)
/*
* For modification
*/
#define A_MB A_CONS(ACCM, TYPB)
#define A_MW A_CONS(ACCM, TYPW)
#define A_ML A_CONS(ACCM, TYPL)
#define A_MF A_CONS(ACCM, TYPF)
#define A_MD A_CONS(ACCM, TYPD)
#define A_MG A_CONS(ACCM, TYPG)
#define A_MH A_CONS(ACCM, TYPH)
/*
* For reading
*/
#define A_RB A_CONS(ACCR, TYPB)
#define A_RW A_CONS(ACCR, TYPW)
#define A_RL A_CONS(ACCR, TYPL)
#define A_RQ A_CONS(ACCR, TYPQ)
#define A_RO A_CONS(ACCR, TYPO)
#define A_RF A_CONS(ACCR, TYPF)
#define A_RD A_CONS(ACCR, TYPD)
#define A_RG A_CONS(ACCR, TYPG)
#define A_RH A_CONS(ACCR, TYPH)
/*
* For writing
*/
#define A_WB A_CONS(ACCW, TYPB)
#define A_WW A_CONS(ACCW, TYPW)
#define A_WL A_CONS(ACCW, TYPL)
#define A_WQ A_CONS(ACCW, TYPQ)
#define A_WO A_CONS(ACCW, TYPO)
#define A_WF A_CONS(ACCW, TYPF)
#define A_WD A_CONS(ACCW, TYPD)
#define A_WG A_CONS(ACCW, TYPG)
#define A_WH A_CONS(ACCW, TYPH)
struct insttab {
char *iname;
u_char eopcode;
u_char popcode;
char nargs;
u_char argtype[6];
};
#define OP(name,eopcode,popdcode,nargs,a1,a2,a3,a4,a5,a6) \
{name,eopcode,popdcode,nargs,a1,a2,a3,a4,a5,a6}
/*
* Definitions for the escape bytes
*/
#define CORE 0
#define NEW 1
#define ESCD 0xfd
#define ESCF 0xff
#define mapescbyte(b) ((b) == ESCD ? 1 : (b) == ESCF ? 2 : 0)
static struct insttab insttab[] = {
#include "../vax/kdb_instrs"
0};
/*
* Convert TYP[BWLQOFDGH] into {1 if relocation not OK}
*/
int ty_NORELOC[] = {
0, /* TYPB */
0, /* TYPW */
0, /* TYPL */
1, /* TYPQ */
1, /* TYPO */
1, /* TYPF */
1, /* TYPD */
1, /* TYPG */
1, /* TYPH */
1 /* TYPNONE */
};
/*
* Convert TYP[BWLQOFDGH] into {1 ... 16}
*/
int ty_nbyte[] = {
1, /* TYPB */
2, /* TYPW */
4, /* TYPL */
8, /* TYPQ */
16, /* TYPO */
4, /* TYPF */
8, /* TYPD */
8, /* TYPG */
16, /* TYPH */
0 /* TYPNONE */
};
static char *regname[] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
"r8", "r9", "r10","r11","ap", "fp", "sp", "pc"
};
static char *fltimm[] = {
"0.5", "0.5625", "0.625", "0.6875", "0.75", "0.8125", "0.875", "0.9375",
"1.0", "1.125", "1.25", "1.375", "1.5", "1.625", "1.75", "1.875",
"2.0", "2.25", "2.5", "2.75", "3.0", "3.25", "3.5", "3.75",
"4.0", "4.5", "5.0", "5.5", "6.0", "6.5", "7.0", "7.5",
"8.0", "9.0", "10.0", "11.0", "12.0", "13.0", "14.0", "15.0",
"16.0", "18.0", "20.0", "22.0", "24.0", "26.0", "28.0", "30.0",
"32.0", "36.0", "40.0", "44.0", "48.0", "52.0", "56.0", "60.0",
"64.0", "72.0", "80.0", "88.0", "96.0", "104.0", "112.0", "120.0"
};
static int type, space, incp;
static long insoutvar[36];
/*
* Definitions for registers and for operand classes
*/
static char *insregname(); /* how to print a register */
#define R_PC 0xF
#define OC_IMM0 0x0
#define OC_IMM1 0x1
#define OC_IMM2 0x2
#define OC_IMM3 0x3
#define OC_INDEX 0x4
#define OC_REG 0x5
#define OC_DREG 0x6
#define OC_ADREG 0x7
#define OC_AIREG 0x8
#define OC_DAIREG 0x9
#define OC_BDISP 0xA
#define OC_DBDISP 0xB
#define OC_WDISP 0xC
#define OC_DWDISP 0xD
#define OC_LDISP 0xE
#define OC_DLDISP 0xF
#define OC_SHIFT 4
#define OC_CONS(oc,reg) (((oc & 0xF) << OC_SHIFT) | (reg & 0xF))
#define OC_AMEXT(x) (((x) >> OC_SHIFT) & 0xF)
#define OC_REGEXT(x) ((x) & 0xF)
/*
* Definitions for large numbers
*/
#include "asnumber.h"
typedef struct as_number *numberp;
static numberp snarf();
static numberp snarfreloc();
/*
* Definitions for special instructions
*/
#define CASEB 0x8F
#define CASEW 0xAF
#define CASEL 0xCF
/* two level 1-based index by opcode into insttab */
static short ioptab[3][256];
kdbsetup()
{
register struct insttab *p;
int mapchar;
for(p = insttab; p->iname; p++){
mapchar = mapescbyte(p->eopcode);
if (ioptab[mapchar][p->popcode])
continue;
ioptab[mapchar][p->popcode] = (p - insttab) + 1;
}
}
static u_char snarfuchar();
/*
* Global variables for communicating with the minions and printins
*/
static int idsp;
static short argno; /* which argument one is working on */
static char insoutfmt[2]; /* how to format the relocated symbols */
static savevar(val)
long val;
{
var[argno] = val;
insoutvar[argno] = val;
}
/* ARGSUSED */
printins(fmt, Idsp, ins)
char fmt;
u_char ins;
int Idsp;
{
u_char mode; /* mode */
u_char ins2;
char *indexreg; /* print of which register indexes */
char *indexed; /* we indexed */
char *operandout();
register u_char *ap;
register struct insttab *ip;
u_char optype;
int mapchar;
idsp = Idsp;
type = DSYM;
space = idsp;
insoutfmt[0] = 0;
incp = 1;
if ((mapchar = mapescbyte(ins)) != 0){
ins2 = snarfuchar();
if (ioptab[mapchar][ins2] == 0){
/*
* Oops; not a defined instruction;
* back over this escape byte.
*/
incp -= 1;
mapchar = 0;
} else {
ins = ins2;
}
}
if (ioptab[mapchar][ins] == 0){
printf("<undefined operator byte>: %x", ins);
goto ret;
}
ip = &insttab[ioptab[mapchar][ins] - 1];
printf("%s\t", ip->iname);
for (ap = ip->argtype, argno = 0; argno < ip->nargs; argno++, ap++) {
savevar(0x80000000); /* an illegal symbol */
optype = *ap;
if (argno != 0)
printc(',');
indexreg = 0;
indexed = 0;
do{
if (A_ACCEXT(optype) & ACCB){
switch(A_TYPEXT(optype)){
case TYPB:
mode = OC_CONS(OC_BDISP, R_PC);
break;
case TYPW:
mode = OC_CONS(OC_WDISP, R_PC);
break;
}
} else {
mode = snarfuchar();
}
indexreg = operandout(mode, optype);
if (indexed)
printf("[%s]", indexed);
indexed = indexreg;
} while(indexed);
}
if (mapchar == 0){
switch(ins){
case CASEB:
case CASEW:
case CASEL:
casebody(insoutvar[1], insoutvar[2]);
break;
default:
break;
}
}
ret: ;
dotinc = incp;
}
casebody(base, limit)
long base;
long limit;
{
int i;
u_int baseincp;
u_int advincp;
struct as_number *valuep;
#define OSIZE (sizeof(short))
argno = 0;
baseincp = incp;
for (i = 0; i <= limit; i++) {
printc(EOR);
printf(" %R: ", i + base);
valuep = snarfreloc(OSIZE, 0);
advincp = incp;
incp = baseincp;
dispaddress(valuep, OC_CONS(OC_WDISP, R_PC));
incp = advincp;
}
}
/*
* magic values to mung an offset to a register into
* something that psymoff can understand.. all magic
*/
/* 0 1 2 3 4 */
static long magic_masks[5] = {0, 0x80, 0x8000, 0, 0};
static long magic_compl[5] = {0, 0x100, 0x10000,0, 0};
/*
* Snarf up some bytes, and put in the magic relocation flags
*/
static numberp snarfreloc(nbytes)
int nbytes;
{
numberp back;
back = snarf(nbytes);
if (back->num_ulong[0] & magic_masks[nbytes])
back->num_ulong[0] -= magic_compl[nbytes];
return(back);
}
/*
* The following code is NOT portable from the PDP 11 to the VAX
* because of the byte ordering problem.
*/
static numberp snarf(nbytes)
int nbytes;
{
register int i;
static struct as_number backnumber;
static struct as_number znumber; /* init'ed to 0 */
backnumber = znumber;
for (i = 0; i < nbytes; i++)
backnumber.num_uchar[i] = snarfuchar();
return(&backnumber);
}
/*
* Read one single character, and advance the dot
*/
static u_char
snarfuchar()
{
u_char back;
/*
* assert: bchkget and inkdot don't have side effects
*/
back = (u_char)bchkget(inkdot(incp), idsp);
incp += 1;
return(back);
}
/*
* normal operand; return non zero pointer to register
* name if this is an index instruction.
*/
char *operandout(mode, optype)
u_char mode;
u_char optype;
{
char *r;
int regnumber;
int nbytes;
regnumber = OC_REGEXT(mode);
r = insregname(regnumber);
switch (OC_AMEXT(mode)){
case OC_IMM0:
case OC_IMM1:
case OC_IMM2:
case OC_IMM3:
shortliteral(mode, optype);
return(0);
case OC_INDEX:
return(r); /* will be printed later */
case OC_REG:
printf("%s", r);
return(0);
case OC_DREG:
printf("(%s)", r);
return(0);
case OC_ADREG:
printf("-(%s)", r);
return(0);
case OC_DAIREG:
printc('*');
case OC_AIREG:
if (regnumber == R_PC){
pcimmediate(mode, optype);
} else {
printf("(%s)+", r);
}
return(0);
case OC_DBDISP:
printc('*');
case OC_BDISP:
nbytes = 1;
break;
case OC_DWDISP:
printc('*');
case OC_WDISP:
nbytes = 2;
break;
case OC_DLDISP:
printc('*');
case OC_LDISP:
nbytes = 4;
break;
}
dispaddress(snarfreloc(nbytes), mode);
return(0);
}
dispaddress(valuep, mode)
numberp valuep;
u_char mode;
{
int regnumber = OC_REGEXT(mode);
switch(OC_AMEXT(mode)){
case OC_BDISP:
case OC_DBDISP:
case OC_WDISP:
case OC_DWDISP:
case OC_LDISP:
case OC_DLDISP:
if (regnumber == R_PC){
/* PC offset addressing */
valuep->num_ulong[0] += inkdot(incp);
}
}
if (regnumber == R_PC)
psymoff(valuep->num_ulong[0], type, &insoutfmt[0]);
else { /* } */
printf(LPRMODE, valuep->num_ulong[0]);
printf(insoutfmt);
printf("(%s)", insregname(regnumber));
}
savevar((long)valuep->num_ulong[0]);
}
/*
* get a register name
*/
static char *
insregname(regnumber)
int regnumber;
{
char *r;
r = regname[regnumber];
return(r);
}
/*
* print out a short literal
*/
shortliteral(mode, optype)
u_char mode;
u_char optype;
{
savevar((long)mode);
switch(A_TYPEXT(optype)){
case TYPF:
case TYPD:
case TYPG:
case TYPH:
printf("$%s", fltimm[mode]);
break;
default:
printf("$%r", mode);
break;
}
}
pcimmediate(mode, optype)
u_char mode;
u_char optype;
{
int nbytes;
printc('$');
if (mode == OC_CONS(OC_DAIREG, R_PC)){ /* PC absolute, always 4 bytes*/
dispaddress(snarfreloc(4), mode);
return;
}
nbytes = ty_nbyte[A_TYPEXT(optype)];
if (! ty_NORELOC[A_TYPEXT(optype)]){
dispaddress(snarfreloc(nbytes), mode);
return;
}
bignumprint(nbytes, optype);
}
bignumprint(nbytes, optype)
int nbytes;
u_char optype;
{
numberp valuep;
int leading_zero = 1;
register int bindex;
register int nindex;
register int ch;
valuep = snarf(nbytes);
switch(A_TYPEXT(optype)){
case TYPF:
printf("0f%f", valuep->num_num.numFf_float.Ff_value);
break;
case TYPD:
printf("0d%f", valuep->num_num.numFd_float.Fd_value);
break;
case TYPG:
printf("0g::"); goto qprint;
case TYPH:
printf("0h::"); goto qprint;
case TYPQ:
case TYPO:
qprint:
for (bindex = nbytes - 1; bindex >= 0; --bindex){
for (nindex = 4; nindex >= 0; nindex -= 4){
ch = (valuep->num_uchar[bindex] >> nindex);
ch &= 0x0F;
if ( ! (leading_zero &= (ch == 0) ) ){
if (ch <= 0x09)
printc(ch + '0');
else
printc(ch - 0x0A + 'a');
}
}
}
break;
}
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.