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simh-testsetgenerator/pdp11_sys.c
Bob Supnik 4d6dfa4bdb simh v2.6
2011-04-15 08:33:28 -07:00

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/* pdp11_sys.c: PDP-11 simulator interface
Copyright (c) 1993-2001, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not
be used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
05-Apr-01 RMS Added support for TS11/TSV05
14-Mar-01 RMS Revised load/dump interface (again)
11-Feb-01 RMS Added DECtape support
30-Oct-00 RMS Added support for examine to file
14-Apr-99 RMS Changed t_addr to unsigned
09-Nov-98 RMS Fixed assignments of ROR/ROL (John Wilson).
27-Oct-98 RMS V2.4 load interface.
08-Oct-98 RMS Fixed bug in bad block routine.
30-Mar-98 RMS Fixed bug in floating point display.
12-Nov-97 RMS Added bad block table routine.
*/
#include "pdp11_defs.h"
#include <ctype.h>
extern DEVICE cpu_dev;
extern DEVICE ptr_dev, ptp_dev;
extern DEVICE tti_dev, tto_dev;
extern DEVICE lpt_dev, clk_dev;
extern DEVICE rk_dev, rx_dev;
extern DEVICE rl_dev, rp_dev;
extern DEVICE dt_dev, tm_dev;
extern DEVICE ts_dev;
/* extern DEVICE hk_dev; */
extern UNIT cpu_unit;
extern REG cpu_reg[];
extern uint16 *M;
extern int32 saved_PC;
/* SCP data structures and interface routines
sim_name simulator name string
sim_PC pointer to saved PC register descriptor
sim_emax number of words for examine
sim_devices array of pointers to simulated devices
sim_stop_messages array of pointers to stop messages
sim_load binary loader
*/
char sim_name[] = "PDP-11";
REG *sim_PC = &cpu_reg[0];
int32 sim_emax = 4;
DEVICE *sim_devices[] = {
&cpu_dev,
&ptr_dev, &ptp_dev,
&tti_dev, &tto_dev,
&lpt_dev, &clk_dev,
&rk_dev, /* &hk_dev, */
&rl_dev, &rp_dev,
&rx_dev, &dt_dev,
&tm_dev, &ts_dev,
NULL };
const char *sim_stop_messages[] = {
"Unknown error",
"Red stack trap",
"Odd address trap",
"Memory management trap",
"Non-existent memory trap",
"Parity error trap",
"Privilege trap",
"Illegal instruction trap",
"BPT trap",
"IOT trap",
"EMT trap",
"TRAP trap",
"Trace trap",
"Yellow stack trap",
"Powerfail trap",
"Floating point exception",
"HALT instruction",
"Breakpoint",
"Wait state",
"Trap vector fetch abort",
"Trap stack push abort" };
/* Binary loader.
Loader format consists of blocks, optionally preceded, separated, and
followed by zeroes. Each block consists of:
001 ---
xxx |
lo_count |
hi_count |
lo_origin > count bytes
hi_origin |
data byte |
: |
data byte ---
checksum
If the byte count is exactly six, the block is the last on the tape, and
there is no checksum. If the origin is not 000001, then the origin is
the PC at which to start the program.
*/
t_stat sim_load (FILE *fileref, char *cptr, char *fnam, int flag)
{
int32 csum, count, state, i;
t_addr origin;
if ((*cptr != 0) || (flag != 0)) return SCPE_ARG;
state = csum = 0;
while ((i = getc (fileref)) != EOF) {
csum = csum + i; /* add into chksum */
switch (state) {
case 0: /* leader */
if (i == 1) state = 1;
else csum = 0;
break;
case 1: /* ignore after 001 */
state = 2;
break;
case 2: /* low count */
count = i;
state = 3;
break;
case 3: /* high count */
count = (i << 8) | count;
state = 4;
break;
case 4: /* low origin */
origin = i;
state = 5;
break;
case 5: /* high origin */
origin = (i << 8) | origin;
if (count == 6) {
if (origin != 1) saved_PC = origin & 0177776;
return SCPE_OK; }
count = count - 6;
state = 6;
break;
case 6: /* data */
if (origin >= MEMSIZE) return SCPE_NXM;
M[origin >> 1] = (origin & 1)?
(M[origin >> 1] & 0377) | (i << 8):
(M[origin >> 1] & 0177400) | i;
origin = origin + 1;
count = count - 1;
state = state + (count == 0);
break;
case 7: /* checksum */
if (csum & 0377) return SCPE_CSUM;
csum = state = 0;
break; } /* end switch */
} /* end while */
return SCPE_FMT; /* unexpected eof */
}
/* Factory bad block table creation routine
This routine writes a DEC standard 044 compliant bad block table on the
last track of the specified unit. The bad block table consists of 10
repetitions of the same table, formatted as follows:
words 0-1 pack id number
words 2-3 cylinder/sector/surface specifications
:
words n-n+1 end of table (-1,-1)
Inputs:
uptr = pointer to unit
sec = number of sectors per surface
wds = number of words per sector
Outputs:
sta = status code
*/
t_stat pdp11_bad_block (UNIT *uptr, int32 sec, int32 wds)
{
int32 i, da;
int16 *buf;
if ((sec < 2) || (wds < 16)) return SCPE_ARG;
if ((uptr -> flags & UNIT_ATT) == 0) return SCPE_UNATT;
if (!get_yn ("Overwrite last track? [N]", FALSE)) return SCPE_OK;
da = (uptr -> capac - (sec * wds)) * sizeof (int16);
if (fseek (uptr -> fileref, da, SEEK_SET)) return SCPE_IOERR;
if ((buf = malloc (wds * sizeof (int16))) == NULL) return SCPE_MEM;
buf[0] = buf[1] = 012345u;
buf[2] = buf[3] = 0;
for (i = 4; i < wds; i++) buf[i] = 0177777u;
for (i = 0; (i < sec) && (i < 10); i++)
fxwrite (buf, sizeof (int16), wds, uptr -> fileref);
free (buf);
if (ferror (uptr -> fileref)) return SCPE_IOERR;
return SCPE_OK;
}
/* Symbol tables */
#define I_V_L 16 /* long mode */
#define I_V_D 17 /* double mode */
#define I_L (1 << I_V_L)
#define I_D (1 << I_V_D)
/* Warning: for literals, the class number MUST equal the field width!! */
#define I_V_CL 18 /* class bits */
#define I_M_CL 017 /* class mask */
#define I_V_NPN 0 /* no operands */
#define I_V_REG 1 /* reg */
#define I_V_SOP 2 /* operand */
#define I_V_3B 3 /* 3b literal */
#define I_V_FOP 4 /* flt operand */
#define I_V_AFOP 5 /* fac, flt operand */
#define I_V_6B 6 /* 6b literal */
#define I_V_BR 7 /* cond branch */
#define I_V_8B 8 /* 8b literal */
#define I_V_SOB 9 /* reg, disp */
#define I_V_RSOP 10 /* reg, operand */
#define I_V_ASOP 11 /* fac, operand */
#define I_V_ASMD 12 /* fac, moded int op */
#define I_V_DOP 13 /* double operand */
#define I_V_CCC 14 /* CC clear */
#define I_V_CCS 15 /* CC set */
#define I_NPN (I_V_NPN << I_V_CL)
#define I_REG (I_V_REG << I_V_CL)
#define I_3B (I_V_3B << I_V_CL)
#define I_SOP (I_V_SOP << I_V_CL)
#define I_FOP (I_V_FOP << I_V_CL)
#define I_6B (I_V_6B << I_V_CL)
#define I_BR (I_V_BR << I_V_CL)
#define I_8B (I_V_8B << I_V_CL)
#define I_AFOP (I_V_AFOP << I_V_CL)
#define I_ASOP (I_V_ASOP << I_V_CL)
#define I_RSOP (I_V_RSOP << I_V_CL)
#define I_SOB (I_V_SOB << I_V_CL)
#define I_ASMD (I_V_ASMD << I_V_CL)
#define I_DOP (I_V_DOP << I_V_CL)
#define I_CCC (I_V_CCC << I_V_CL)
#define I_CCS (I_V_CCS << I_V_CL)
static const int32 masks[] = {
0177777, 0177770, 0177700, 0177770,
0177700+I_D, 0177400+I_D, 0177700, 0177400,
0177400, 0177000, 0177000, 0177400,
0177400+I_D+I_L, 0170000, 0177777, 0177777 };
static const char *opcode[] = {
"HALT","WAIT","RTI","BPT",
"IOT","RESET","RTT","MFPT",
"JMP","RTS","SPL",
"NOP","CLC","CLV","CLV CLC",
"CLZ","CLZ CLC","CLZ CLV","CLZ CLV CLC",
"CLN","CLN CLC","CLN CLV","CLN CLV CLC",
"CLN CLZ","CLN CLZ CLC","CLN CLZ CLC","CCC",
"NOP","SEC","SEV","SEV SEC",
"SEZ","SEZ SEC","SEZ SEV","SEZ SEV SEC",
"SEN","SEN SEC","SEN SEV","SEN SEV SEC",
"SEN SEZ","SEN SEZ SEC","SEN SEZ SEC","SCC",
"SWAB","BR","BNE","BEQ",
"BGE","BLT","BGT","BLE",
"JSR",
"CLR","COM","INC","DEC",
"NEG","ADC","SBC","TST",
"ROR","ROL","ASR","ASL",
"MARK","MFPI","MTPI","SXT",
"CSM", "TSTSET","WRTLCK",
"MOV","CMP","BIT","BIC",
"BIS","ADD",
"MUL","DIV","ASH","ASHC",
"XOR",
"FADD","FSUB","FMUL","FDIV",
"L2DR",
"MOVC","MOVRC","MOVTC",
"LOCC","SKPC","SCANC","SPANC",
"CMPC","MATC",
"ADDN","SUBN","CMPN","CVTNL",
"CVTPN","CVTNP","ASHN","CVTLN",
"L3DR",
"ADDP","SUBP","CMPP","CVTPL",
"MULP","DIVP","ASHP","CVTLP",
"MOVCI","MOVRCI","MOVTCI",
"LOCCI","SKPCI","SCANCI","SPANCI",
"CMPCI","MATCI",
"ADDNI","SUBNI","CMPNI","CVTNLI",
"CVTPNI","CVTNPI","ASHNI","CVTLNI",
"ADDPI","SUBPI","CMPPI","CVTPLI",
"MULPI","DIVPI","ASHPI","CVTLPI",
"SOB",
"BPL","BMI","BHI","BLOS",
"BVC","BVS","BCC","BCS",
"BHIS","BLO", /* encode only */
"EMT","TRAP",
"CLRB","COMB","INCB","DECB",
"NEGB","ADCB","SBCB","TSTB",
"RORB","ROLB","ASRB","ASLB",
"MTPS","MFPD","MTPD","MFPS",
"MOVB","CMPB","BITB","BICB",
"BISB","SUB",
"CFCC","SETF","SETI","SETD","SETL",
"LDFPS","STFPS","STST",
"CLRF","CLRD","TSTF","TSTD",
"ABSF","ABSD","NEGF","NEGD",
"MULF","MULD","MODF","MODD",
"ADDF","ADDD","LDF","LDD",
"SUBF","SUBD","CMPF","CMPD",
"STF","STD","DIVF","DIVD",
"STEXP",
"STCFI","STCDI","STCFL","STCDL",
"STCFD","STCDF",
"LDEXP",
"LDCIF","LDCID","LDCLF","LDCLD",
"LDCFD","LDCDF",
NULL };
static const int32 opc_val[] = {
0000000+I_NPN, 0000001+I_NPN, 0000002+I_NPN, 0000003+I_NPN,
0000004+I_NPN, 0000005+I_NPN, 0000006+I_NPN, 0000007+I_NPN,
0000100+I_SOP, 0000200+I_REG, 0000230+I_3B,
0000240+I_CCC, 0000241+I_CCC, 0000242+I_CCC, 0000243+I_NPN,
0000244+I_CCC, 0000245+I_NPN, 0000246+I_NPN, 0000247+I_NPN,
0000250+I_CCC, 0000251+I_NPN, 0000252+I_NPN, 0000253+I_NPN,
0000254+I_NPN, 0000255+I_NPN, 0000256+I_NPN, 0000257+I_CCC,
0000260+I_CCS, 0000261+I_CCS, 0000262+I_CCS, 0000263+I_NPN,
0000264+I_CCS, 0000265+I_NPN, 0000266+I_NPN, 0000267+I_NPN,
0000270+I_CCS, 0000271+I_NPN, 0000272+I_NPN, 0000273+I_NPN,
0000274+I_NPN, 0000275+I_NPN, 0000276+I_NPN, 0000277+I_CCS,
0000300+I_SOP, 0000400+I_BR, 0001000+I_BR, 0001400+I_BR,
0002000+I_BR, 0002400+I_BR, 0003000+I_BR, 0003400+I_BR,
0004000+I_RSOP,
0005000+I_SOP, 0005100+I_SOP, 0005200+I_SOP, 0005300+I_SOP,
0005400+I_SOP, 0005500+I_SOP, 0005600+I_SOP, 0005700+I_SOP,
0006000+I_SOP, 0006100+I_SOP, 0006200+I_SOP, 0006300+I_SOP,
0006400+I_6B, 0006500+I_SOP, 0006600+I_SOP, 0006700+I_SOP,
0007000+I_SOP, 0007200+I_SOP, 0007300+I_SOP,
0010000+I_DOP, 0020000+I_DOP, 0030000+I_DOP, 0040000+I_DOP,
0050000+I_DOP, 0060000+I_DOP,
0070000+I_RSOP, 0071000+I_RSOP, 0072000+I_RSOP, 0073000+I_RSOP,
0074000+I_RSOP,
0075000+I_REG, 0075010+I_REG, 0075020+I_REG, 0075030+I_REG,
0076020+I_REG,
0076030+I_NPN, 0076031+I_NPN, 0076032+I_NPN,
0076040+I_NPN, 0076041+I_NPN, 0076042+I_NPN, 0076043+I_NPN,
0076044+I_NPN, 0076045+I_NPN,
0076050+I_NPN, 0076051+I_NPN, 0076052+I_NPN, 0076053+I_NPN,
0076054+I_NPN, 0076055+I_NPN, 0076056+I_NPN, 0076057+I_NPN,
0076060+I_REG,
0076070+I_NPN, 0076071+I_NPN, 0076072+I_NPN, 0076073+I_NPN,
0076074+I_NPN, 0076075+I_NPN, 0076076+I_NPN, 0076077+I_NPN,
0076130+I_NPN, 0076131+I_NPN, 0076132+I_NPN,
0076140+I_NPN, 0076141+I_NPN, 0076142+I_NPN, 0076143+I_NPN,
0076144+I_NPN, 0076145+I_NPN,
0076150+I_NPN, 0076151+I_NPN, 0076152+I_NPN, 0076153+I_NPN,
0076154+I_NPN, 0076155+I_NPN, 0076156+I_NPN, 0076157+I_NPN,
0076170+I_NPN, 0076171+I_NPN, 0076172+I_NPN, 0076173+I_NPN,
0076174+I_NPN, 0076175+I_NPN, 0076176+I_NPN, 0076177+I_NPN,
0077000+I_SOB,
0100000+I_BR, 0100400+I_BR, 0101000+I_BR, 0101400+I_BR,
0102000+I_BR, 0102400+I_BR, 0103000+I_BR, 0103400+I_BR,
0103000+I_BR, 0103400+I_BR,
0104000+I_8B, 0104400+I_8B,
0105000+I_SOP, 0105100+I_SOP, 0105200+I_SOP, 0105300+I_SOP,
0105400+I_SOP, 0105500+I_SOP, 0105600+I_SOP, 0105700+I_SOP,
0106000+I_SOP, 0106100+I_SOP, 0106200+I_SOP, 0106300+I_SOP,
0106400+I_SOP, 0106500+I_SOP, 0106600+I_SOP, 0106700+I_SOP,
0110000+I_DOP, 0120000+I_DOP, 0130000+I_DOP, 0140000+I_DOP,
0150000+I_DOP, 0160000+I_DOP,
0170000+I_NPN, 0170001+I_NPN, 0170002+I_NPN, 0170011+I_NPN, 0170012+I_NPN,
0170100+I_SOP, 0170200+I_SOP, 0170300+I_SOP,
0170400+I_FOP, 0170400+I_FOP+I_D, 0170500+I_FOP, 0170500+I_FOP+I_D,
0170600+I_FOP, 0170600+I_FOP+I_D, 0170700+I_FOP, 0170700+I_FOP+I_D,
0171000+I_AFOP, 0171000+I_AFOP+I_D, 0171400+I_AFOP, 0171400+I_AFOP+I_D,
0172000+I_AFOP, 0172000+I_AFOP+I_D, 0172400+I_AFOP, 0172400+I_AFOP+I_D,
0173000+I_AFOP, 0173000+I_AFOP+I_D, 0173400+I_AFOP, 0173400+I_AFOP+I_D,
0174000+I_AFOP, 0174000+I_AFOP+I_D, 0174400+I_AFOP, 0174400+I_AFOP+I_D,
0175000+I_ASOP,
0175400+I_ASMD, 0175400+I_ASMD+I_D, 0175400+I_ASMD+I_L, 0175400+I_ASMD+I_D+I_L,
0176000+I_AFOP, 0176000+I_AFOP+I_D,
0176400+I_ASOP,
0177000+I_ASMD, 0177000+I_ASMD+I_D, 0177000+I_ASMD+I_L, 0177000+I_ASMD+I_D+I_L,
0177400+I_AFOP, 0177400+I_AFOP+I_D,
-1 };
static const char *rname [] =
{ "R0", "R1", "R2", "R3", "R4", "R5", "SP", "PC" };
static const char *fname [] =
{ "F0", "F1", "F2", "F3", "F4", "F5", "?6", "?7" };
/* Specifier decode
Inputs:
*of = output stream
addr = current PC
spec = specifier
nval = next word
flag = TRUE if decoding for CPU
iflag = TRUE if decoding integer instruction
Outputs:
count = -number of extra words retired
*/
int32 fprint_spec (FILE *of, t_addr addr, int32 spec, t_value nval,
int32 flag, int32 iflag)
{
int32 reg;
reg = spec & 07;
switch ((spec >> 3) & 07) {
case 0:
if (iflag) fprintf (of, "%s", rname[reg]);
else fprintf (of, "%s", fname[reg]);
return 0;
case 1:
fprintf (of, "(%s)", rname[reg]);
return 0;
case 2:
if (reg != 7) {
fprintf (of, "(%s)+", rname[reg]);
return 0; }
else { fprintf (of, "#%-o", nval);
return -1; }
case 3:
if (reg != 7) {
fprintf (of, "@(%s)+", rname[reg]);
return 0; }
else { fprintf (of, "@#%-o", nval);
return -1; }
case 4:
fprintf (of, "-(%s)", rname[reg]);
return 0;
case 5:
fprintf (of, "@-(%s)", rname[reg]);
return 0;
case 6:
if ((reg != 7) || !flag) fprintf (of, "%-o(%s)", nval, rname[reg]);
else fprintf (of, "%-o", (nval + addr + 4) & 0177777);
return -1;
case 7:
if ((reg != 7) || !flag) fprintf (of, "@%-o(%s)", nval, rname[reg]);
else fprintf (of, "@%-o", (nval + addr + 4) & 0177777);
return -1; } /* end case */
}
/* Symbolic decode
Inputs:
*of = output stream
addr = current PC
*val = values to decode
*uptr = pointer to unit
sw = switches
Outputs:
return = if >= 0, error code
if < 0, number of extra words retired
*/
t_stat fprint_sym (FILE *of, t_addr addr, t_value *val,
UNIT *uptr, int32 sw)
{
int32 cflag, i, j, c1, c2, inst, fac, srcm, srcr, dstm, dstr;
int32 l8b, brdisp, wd1, wd2;
extern int32 FPS;
cflag = (uptr == NULL) || (uptr == &cpu_unit);
c1 = val[0] & 0177;
c2 = (val[0] >> 8) & 0177;
if (sw & SWMASK ('A')) { /* ASCII? */
fprintf (of, (c1 < 040)? "<%03o>": "%c", c1);
return SCPE_OK; }
if (sw & SWMASK ('C')) { /* character? */
fprintf (of, (c1 < 040)? "<%03o>": "%c", c1);
fprintf (of, (c2 < 040)? "<%03o>": "%c", c2);
return SCPE_OK; }
if (!(sw & SWMASK ('M'))) return SCPE_ARG;
inst = val[0] | ((FPS << (I_V_L - FPS_V_L)) & I_L) |
((FPS << (I_V_D - FPS_V_D)) & I_D); /* inst + fp mode */
for (i = 0; opc_val[i] >= 0; i++) { /* loop thru ops */
j = (opc_val[i] >> I_V_CL) & I_M_CL; /* get class */
if ((opc_val[i] & 0777777) == (inst & masks[j])) { /* match? */
srcm = (inst >> 6) & 077; /* opr fields */
srcr = srcm & 07;
fac = srcm & 03;
dstm = inst & 077;
dstr = dstm & 07;
l8b = inst & 0377;
/* Instruction decode */
switch (j) { /* case on class */
case I_V_NPN: case I_V_CCC: case I_V_CCS: /* no operands */
fprintf (of, "%s", opcode[i]);
return SCPE_OK;
case I_V_REG: /* reg */
fprintf (of, "%s %-s", opcode[i], rname[dstr]);
return SCPE_OK;
case I_V_SOP: /* sop */
fprintf (of, "%s ", opcode[i]);
return fprint_spec (of, addr, dstm, val[1], cflag, TRUE);
case I_V_3B: /* 3b */
fprintf (of, "%s %-o", opcode[i], dstr);
return SCPE_OK;
case I_V_FOP: /* fop */
fprintf (of, "%s ", opcode[i]);
return fprint_spec (of, addr, dstm, val[1], cflag, FALSE);
case I_V_AFOP: /* afop */
fprintf (of, "%s %s,", opcode[i], fname[fac]);
return fprint_spec (of, addr, dstm, val[1], cflag, FALSE);
case I_V_6B: /* 6b */
fprintf (of, "%s %-o", opcode[i], dstm);
return SCPE_OK;
case I_V_BR: /* cond branch */
fprintf (of, "%s ", opcode[i]);
brdisp = (l8b + l8b + ((l8b & 0200)? 0177002: 2)) & 0177777;
if (cflag) fprintf (of, "%-o", (addr + brdisp) & 0177777);
else if (brdisp < 01000) fprintf (of, ".+%-o", brdisp);
else fprintf (of, ".-%-o", 0200000 - brdisp);
return SCPE_OK;
case I_V_8B: /* 8b */
fprintf (of, "%s %-o", opcode[i], l8b);
return SCPE_OK;
case I_V_SOB: /* sob */
fprintf (of, "%s %s,", opcode[i], rname[srcr]);
brdisp = (dstm * 2) - 2;
if (cflag) fprintf (of, "%-o", (addr - brdisp) & 0177777);
else if (brdisp <= 0) fprintf (of, ".+%-o", -brdisp);
else fprintf (of, ".-%-o", brdisp);
return SCPE_OK;
case I_V_RSOP: /* rsop */
fprintf (of, "%s %s,", opcode[i], rname[srcr]);
return fprint_spec (of, addr, dstm, val[1], cflag, TRUE);
case I_V_ASOP: case I_V_ASMD: /* asop, asmd */
fprintf (of, "%s %s,", opcode[i], fname[fac]);
return fprint_spec (of, addr, dstm, val[1], cflag, TRUE);
case I_V_DOP: /* dop */
fprintf (of, "%s ", opcode[i]);
wd1 = fprint_spec (of, addr, srcm, val[1], cflag, TRUE);
fprintf (of, ",");
wd2 = fprint_spec (of, addr - wd1 - wd1, dstm,
val[1 - wd1], cflag, TRUE);
return wd1 + wd2; } /* end case */
} /* end if */
} /* end for */
return SCPE_ARG; /* no match */
}
#define A_PND 100 /* # seen */
#define A_MIN 040 /* -( seen */
#define A_PAR 020 /* (Rn) seen */
#define A_REG 010 /* Rn seen */
#define A_PLS 004 /* + seen */
#define A_NUM 002 /* number seen */
#define A_REL 001 /* relative addr seen */
/* Register number
Inputs:
*cptr = pointer to input string
*strings = pointer to register names
mchar = character to match after register name
Outputs:
rnum = 0..7 if a legitimate register
< 0 if error
*/
int32 get_reg (char *cptr, const char *strings[], char mchar)
{
int32 i;
if (*(cptr + 2) != mchar) return -1;
for (i = 0; i < 8; i++) {
if (strncmp (cptr, strings[i], 2) == 0) return i; }
return -1;
}
/* Number or memory address
Inputs:
*cptr = pointer to input string
*dptr = pointer to output displacement
*pflag = pointer to accumulating flags
Outputs:
cptr = pointer to next character in input string
NULL if parsing error
Flags: 0 (no result), A_NUM (number), A_REL (relative)
*/
char *get_addr (char *cptr, int32 *dptr, int32 *pflag)
{
int32 val, minus;
char *tptr;
minus = 0;
if (*cptr == '.') { /* relative? */
*pflag = *pflag | A_REL;
cptr++; }
if (*cptr == '+') { /* +? */
*pflag = *pflag | A_NUM;
cptr++; }
if (*cptr == '-') { /* -? */
*pflag = *pflag | A_NUM;
minus = 1;
cptr++; }
errno = 0;
val = strtoul (cptr, &tptr, 8);
if (cptr == tptr) { /* no number? */
if (*pflag != (A_REL + A_NUM)) return cptr;
else return NULL; }
if (errno || (*pflag == A_REL)) return NULL; /* .n? */
*dptr = (minus? -val: val) & 0177777;
*pflag = *pflag | A_NUM;
return tptr;
}
/* Specifier decode
Inputs:
*cptr = pointer to input string
addr = current PC
n1 = 0 if no extra word used
-1 if extra word used in prior decode
*sptr = pointer to output specifier
*dptr = pointer to output displacement
cflag = true if parsing for the CPU
iflag = true if integer specifier
Outputs:
status = = -1 extra word decoded
= 0 ok
= +1 error
*/
t_stat get_spec (char *cptr, t_addr addr, int32 n1, int32 *sptr, t_value *dptr,
int32 cflag, int32 iflag)
{
int32 reg, indir, pflag, disp;
indir = 0; /* no indirect */
pflag = 0;
if (*cptr == '@') { /* indirect? */
indir = 010;
cptr++; }
if (*cptr == '#') { /* literal? */
pflag = pflag | A_PND;
cptr++; }
if (strncmp (cptr, "-(", 2) == 0) { /* autodecrement? */
pflag = pflag | A_MIN;
cptr++; }
else if ((cptr = get_addr (cptr, &disp, &pflag)) == NULL) return 1;
if (*cptr == '(') { /* register index? */
pflag = pflag | A_PAR;
if ((reg = get_reg (cptr + 1, rname, ')')) < 0) return 1;
cptr = cptr + 4;
if (*cptr == '+') { /* autoincrement? */
pflag = pflag | A_PLS;
cptr++; } }
else if ((reg = get_reg (cptr, iflag? rname: fname, 0)) >= 0) {
pflag = pflag | A_REG;
cptr = cptr + 2; }
if (*cptr != 0) return 1; /* all done? */
/* Specifier decode, continued */
switch (pflag) { /* case on syntax */
case A_REG: /* Rn, @Rn */
*sptr = indir + reg;
return 0;
case A_PAR: /* (Rn), @(Rn) */
if (indir) { /* @(Rn) = @0(Rn) */
*sptr = 070 + reg;
*dptr = 0;
return -1; }
else *sptr = 010 + reg;
return 0;
case A_PAR+A_PLS: /* (Rn)+, @(Rn)+ */
*sptr = 020 + indir + reg;
return 0;
case A_MIN+A_PAR: /* -(Rn), @-(Rn) */
*sptr = 040 + indir + reg;
return 0;
case A_NUM+A_PAR: /* d(Rn), @d(Rn) */
*sptr = 060 + indir + reg;
*dptr = disp;
return -1;
case A_PND+A_REL: case A_PND+A_REL+A_NUM: /* #.+n, @#.+n */
if (!cflag) return 1;
disp = (disp + addr) & 0177777; /* fall through */
case A_PND+A_NUM: /* #n, @#n */
*sptr = 027 + indir;
*dptr = disp;
return -1;
case A_REL: case A_REL+A_NUM: /* .+n, @.+n */
*sptr = 067 + indir;
*dptr = (disp - 4 + (2 * n1)) & 0177777;
return -1;
case A_NUM: /* n, @n */
if (cflag) { /* CPU - use rel */
*sptr = 067 + indir;
*dptr = (disp - addr - 4 + (2 * n1)) & 0177777; }
else { if (indir) return 1; /* other - use abs */
*sptr = 037;
*dptr = disp; }
return -1;
default:
return 1; } /* end case */
}
/* Symbolic input
Inputs:
*cptr = pointer to input string
addr = current PC
*uptr = pointer to unit
*val = pointer to output values
sw = switches
Outputs:
status = > 0 error code
<= 0 -number of extra words
*/
t_stat parse_sym (char *cptr, t_addr addr, UNIT *uptr, t_value *val, int32 sw)
{
int32 cflag, d, i, j, reg, spec, n1, n2, disp, pflag;
t_stat r;
char gbuf[CBUFSIZE];
cflag = (uptr == NULL) || (uptr == &cpu_unit);
while (isspace (*cptr)) cptr++; /* absorb spaces */
if ((sw & SWMASK ('A')) || ((*cptr == '\'') && cptr++)) { /* ASCII char? */
if (cptr[0] == 0) return SCPE_ARG; /* must have 1 char */
val[0] = (t_value) cptr[0];
return SCPE_OK; }
if ((sw & SWMASK ('C')) || ((*cptr == '"') && cptr++)) { /* ASCII string? */
if (cptr[0] == 0) return SCPE_ARG; /* must have 1 char */
val[0] = ((t_value) cptr[1] << 8) + (t_value) cptr[0];
return SCPE_OK; }
cptr = get_glyph (cptr, gbuf, 0); /* get opcode */
n1 = n2 = pflag = 0;
for (i = 0; (opcode[i] != NULL) && (strcmp (opcode[i], gbuf) != 0) ; i++) ;
if (opcode[i] == NULL) return SCPE_ARG;
val[0] = opc_val[i] & 0177777; /* get value */
j = (opc_val[i] >> I_V_CL) & I_M_CL; /* get class */
switch (j) { /* case on class */
case I_V_NPN: /* no operand */
break;
case I_V_REG: /* register */
cptr = get_glyph (cptr, gbuf, 0); /* get glyph */
if ((reg = get_reg (gbuf, rname, 0)) < 0) return SCPE_ARG;
val[0] = val[0] | reg;
break;
case I_V_3B: case I_V_6B: case I_V_8B: /* xb literal */
cptr = get_glyph (cptr, gbuf, 0); /* get literal */
d = get_uint (gbuf, 8, (1 << j) - 1, &r);
if (r != SCPE_OK) return SCPE_ARG;
val[0] = val[0] | d; /* put in place */
break;
case I_V_BR: /* cond br */
cptr = get_glyph (cptr, gbuf, 0); /* get address */
if ((cptr = get_addr (gbuf, &disp, &pflag)) == NULL) return SCPE_ARG;
if ((pflag & A_REL) == 0) {
if (cflag) disp = (disp - addr) & 0177777;
else return SCPE_ARG; }
if ((disp & 1) || (disp > 0400) && (disp < 0177402)) return SCPE_ARG;
val[0] = val[0] | (((disp - 2) >> 1) & 0377);
break;
case I_V_SOB: /* sob */
cptr = get_glyph (cptr, gbuf, ','); /* get glyph */
if ((reg = get_reg (gbuf, rname, 0)) < 0) return SCPE_ARG;
val[0] = val[0] | (reg << 6);
cptr = get_glyph (cptr, gbuf, 0); /* get address */
if ((cptr = get_addr (gbuf, &disp, &pflag)) == NULL) return SCPE_ARG;
if ((pflag & A_REL) == 0) {
if (cflag) disp = (disp - addr) & 0177777;
else return SCPE_ARG; }
if ((disp & 1) || ((disp > 2) && (disp < 0177604))) return SCPE_ARG;
val[0] = val[0] | (((2 - disp) >> 1) & 077);
break;
case I_V_RSOP: /* reg, sop */
cptr = get_glyph (cptr, gbuf, ','); /* get glyph */
if ((reg = get_reg (gbuf, rname, 0)) < 0) return SCPE_ARG;
val[0] = val[0] | (reg << 6); /* fall through */
case I_V_SOP: /* sop */
cptr = get_glyph (cptr, gbuf, 0); /* get glyph */
if ((n1 = get_spec (gbuf, addr, 0, &spec, &val[1], cflag, TRUE)) > 0)
return SCPE_ARG;
val[0] = val[0] | spec;
break;
case I_V_AFOP: case I_V_ASOP: case I_V_ASMD: /* fac, (s)fop */
cptr = get_glyph (cptr, gbuf, ','); /* get glyph */
if ((reg = get_reg (gbuf, fname, 0)) < 0) return SCPE_ARG;
if (reg > 3) return SCPE_ARG;
val[0] = val[0] | (reg << 6); /* fall through */
case I_V_FOP: /* fop */
cptr = get_glyph (cptr, gbuf, 0); /* get glyph */
if ((n1 = get_spec (gbuf, addr, 0, &spec, &val[1], cflag,
(j == I_V_ASOP) || (j == I_V_ASMD))) > 0) return SCPE_ARG;
val[0] = val[0] | spec;
break;
case I_V_DOP: /* double op */
cptr = get_glyph (cptr, gbuf, ','); /* get glyph */
if ((n1 = get_spec (gbuf, addr, 0, &spec, &val[1], cflag, TRUE)) > 0)
return SCPE_ARG;
val[0] = val[0] | (spec << 6);
cptr = get_glyph (cptr, gbuf, 0); /* get glyph */
if ((n2 = get_spec (gbuf, addr, n1, &spec, &val[1 - n1],
cflag, TRUE)) > 0) return SCPE_ARG;
val[0] = val[0] | spec;
break;
case I_V_CCC: case I_V_CCS: /* cond code oper */
for (cptr = get_glyph (cptr, gbuf, 0); gbuf[0] != 0;
cptr = get_glyph (cptr, gbuf, 0)) {
for (i = 0; (opcode[i] != NULL) &&
(strcmp (opcode[i], gbuf) != 0) ; i++) ;
if ((((opc_val[i] >> I_V_CL) & I_M_CL) != j) ||
(opcode[i] == NULL)) return SCPE_ARG;
val[0] = val[0] | (opc_val[i] & 0177777); }
break;
default:
return SCPE_ARG; }
if (*cptr != 0) return SCPE_ARG; /* junk at end? */
return n1 + n2;
}
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