| /* lgp_sys.c: LGP-30 simulator interface | |
| Copyright (c) 2004-2008, 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. | |
| 04-Jan-05 RMS Modified VM pointer setup | |
| */ | |
| #include "lgp_defs.h" | |
| #include <ctype.h> | |
| t_stat parse_sym_m (char *cptr, t_value *val, int32 sw); | |
| void lgp_init (void); | |
| extern DEVICE cpu_dev; | |
| extern UNIT cpu_unit; | |
| extern DEVICE tti_dev, tto_dev; | |
| extern DEVICE ptr_dev, ptp_dev; | |
| extern REG cpu_reg[]; | |
| extern uint32 M[]; | |
| extern uint32 PC; | |
| extern uint32 ts_flag; | |
| extern int32 sim_switches; | |
| extern int32 flex_to_ascii[128], ascii_to_flex[128]; | |
| extern void (*sim_vm_fprint_addr) (FILE *st, DEVICE *dptr, t_addr addr); | |
| extern t_addr (*sim_vm_parse_addr) (DEVICE *dptr, char *cptr, char **tptr); | |
| /* SCP data structures and interface routines | |
| sim_name simulator name string | |
| sim_PC pointer to saved PC register descriptor | |
| sim_emax maximum number of words for examine/deposit | |
| sim_devices array of pointers to simulated devices | |
| sim_stop_messages array of pointers to stop messages | |
| sim_load binary loader | |
| */ | |
| char sim_name[] = "LGP30"; | |
| REG *sim_PC = &cpu_reg[0]; | |
| int32 sim_emax = 1; | |
| DEVICE *sim_devices[] = { | |
| &cpu_dev, | |
| &tti_dev, | |
| &tto_dev, | |
| &ptr_dev, | |
| &ptp_dev, | |
| NULL | |
| }; | |
| const char *sim_stop_messages[] = { | |
| "Unknown error", | |
| "STOP", | |
| "Breakpoint", | |
| "Arithmetic overflow" | |
| }; | |
| /* Binary loader - implements a restricted form of subroutine 10.4 | |
| Switches: | |
| -t, input file is transposed Flex | |
| -n, no checksums on v commands (10.0 compatible) | |
| default is ASCII encoded Flex | |
| Commands (in bits 0-3): | |
| (blank) instruction | |
| + command (not supported) | |
| ; start fill | |
| / set modifier | |
| . stop and transfer | |
| , hex words | |
| v hex fill (checksummed unless -n) | |
| 8 negative instruction | |
| */ | |
| /* Utility routine - read characters until ' (conditional stop) */ | |
| t_stat load_getw (FILE *fi, uint32 *wd) | |
| { | |
| int32 flex, c; | |
| *wd = 0; | |
| while ((c = fgetc (fi)) != EOF) { | |
| if (sim_switches & SWMASK ('T')) | |
| flex = ((c << 1) | (c >> 5)) & 0x3F; | |
| else flex = ascii_to_flex[c & 0x7F]; | |
| if ((flex == FLEX_CR) || (flex == FLEX_DEL) || | |
| (flex == FLEX_UC) || (flex == FLEX_LC) || | |
| (flex == FLEX_BS) || (flex < 0)) | |
| continue; | |
| if (flex == FLEX_CSTOP) | |
| return SCPE_OK; | |
| *wd = (*wd << 4) | ((flex >> 2) & 0xF); | |
| } | |
| return SCPE_FMT; | |
| } | |
| /* Utility routine - convert ttss decimal address to binary */ | |
| t_stat load_geta (uint32 wd, uint32 *ad) | |
| { | |
| uint32 n1, n2, n3, n4, tr, sc; | |
| n1 = (wd >> 12) & 0xF; | |
| n2 = (wd >> 8) & 0xF; | |
| n3 = (wd >> 4) & 0xF; | |
| n4 = wd & 0xF; | |
| if ((n2 > 9) || (n4 > 9)) | |
| return SCPE_ARG; | |
| tr = (n1 * 10) + n2; | |
| sc = (n3 * 10) + n4; | |
| if ((tr >= NTK_30) || (sc >= NSC_30)) | |
| return SCPE_ARG; | |
| *ad = (tr * NSC_30) + sc; | |
| return SCPE_OK; | |
| } | |
| /* Loader proper */ | |
| t_stat sim_load (FILE *fi, char *cptr, char *fnam, int flag) | |
| { | |
| uint32 wd, origin, amod, csum, cnt, tr, sc, ad, cmd; | |
| origin = amod = 0; | |
| for (;;) { /* until stopped */ | |
| if (load_getw (fi, &wd)) /* get ctrl word */ | |
| break; | |
| cmd = (wd >> 28) & 0xF; /* get <0:3> */ | |
| switch (cmd) { /* decode <0:3> */ | |
| case 0x2: /* + command */ | |
| return SCPE_FMT; | |
| case 0x3: /* ; start fill */ | |
| if (load_geta (wd, &origin)) /* origin = addr */ | |
| return SCPE_FMT; | |
| break; | |
| case 0x4: /* / set modifier */ | |
| if (load_geta (wd, &amod)) /* modifier = addr */ | |
| return SCPE_FMT; | |
| break; | |
| case 0x5: /* . transfer */ | |
| if (load_geta (wd, &PC)) /* PC = addr */ | |
| return SCPE_FMT; | |
| return SCPE_OK; /* done! */ | |
| case 0x6: /* hex words */ | |
| if (load_geta (wd, &cnt)) /* count = addr */ | |
| return SCPE_FMT; | |
| if ((cnt == 0) || (cnt > 63)) | |
| return SCPE_FMT; | |
| while (cnt--) { /* fill hex words */ | |
| if (load_getw (fi, &wd)) | |
| return SCPE_FMT; | |
| Write (origin, wd); | |
| origin = (origin + 1) & AMASK; | |
| } | |
| break; | |
| case 0x7: /* hex fill */ | |
| cnt = (wd >> 16) & 0xFFF; /* hex count */ | |
| tr = (wd >> 8) & 0xFF; /* hex track */ | |
| sc = wd & 0xFF; /* hex sector */ | |
| if ((cnt == 0) || (cnt > 0x7FF) || /* validate */ | |
| (tr >= NTK_30) || (sc >= NSC_30)) | |
| return SCPE_ARG; | |
| ad = (tr * NSC_30) + sc; /* decimal addr */ | |
| for (csum = 0; cnt; cnt--) { /* fill words */ | |
| if (load_getw (fi, &wd)) | |
| return SCPE_FMT; | |
| Write (ad, wd); | |
| csum = (csum + wd) & MMASK; | |
| ad = (ad + 1) & AMASK; | |
| } | |
| if (!(sim_switches & SWMASK ('N'))) { /* unless -n, csum */ | |
| if (load_getw (fi, &wd)) | |
| return SCPE_FMT; | |
| /* if ((csum ^wd) & MMASK) | |
| return SCPE_CSUM; */ | |
| } | |
| break; | |
| case 0x0: case 0x8: /* instructions */ | |
| if (load_geta (wd, &ad)) /* get address */ | |
| return SCPE_FMT; | |
| if ((wd & 0x00F00000) != 0x00900000) /* if not x, */ | |
| ad = (ad + amod) & AMASK; /* modify */ | |
| wd = (wd & (SIGN|I_OP)) + (ad << I_V_EA); /* instruction */ | |
| default: /* data word */ | |
| Write (origin, wd); | |
| origin = (origin + 1) & AMASK; | |
| break; | |
| } /* end case */ | |
| } /* end for */ | |
| return SCPE_OK; | |
| } | |
| /* Symbol tables */ | |
| static const char opcode[] = "ZBYRIDNMPEUTHCAS"; | |
| static const char hex_decode[] = "0123456789FGJKQW"; | |
| void lgp_fprint_addr (FILE *st, DEVICE *dptr, t_addr addr) | |
| { | |
| if ((dptr == sim_devices[0]) && | |
| ((sim_switches & SWMASK ('T')) || | |
| ((cpu_unit.flags & UNIT_TTSS_D) && !(sim_switches & SWMASK ('N'))))) | |
| fprintf (st, "%02d%02d", addr >> 6, addr & SCMASK_30); | |
| else fprint_val (st, addr, dptr->aradix, dptr->awidth, PV_LEFT); | |
| return; | |
| } | |
| t_addr lgp_parse_addr (DEVICE *dptr, char *cptr, char **tptr) | |
| { | |
| t_addr ad, ea; | |
| if ((dptr == sim_devices[0]) && | |
| ((sim_switches & SWMASK ('T')) || | |
| ((cpu_unit.flags & UNIT_TTSS_D) && !(sim_switches & SWMASK ('N'))))) { | |
| ad = (t_addr) strtotv (cptr, tptr, 10); | |
| if (((ad / 100) >= NTK_30) || ((ad % 100) >= NSC_30)) { | |
| *tptr = cptr; | |
| return 0; | |
| } | |
| ea = ((ad / 100) * NSC_30) | (ad % 100); | |
| } | |
| else ea = (t_addr) strtotv (cptr, tptr, dptr->aradix); | |
| return ea; | |
| } | |
| void lgp_vm_init (void) | |
| { | |
| sim_vm_fprint_addr = &lgp_fprint_addr; | |
| sim_vm_parse_addr = &lgp_parse_addr; | |
| return; | |
| } | |
| /* Symbolic decode | |
| Inputs: | |
| *of = output stream | |
| addr = current PC | |
| *val = pointer to data | |
| *uptr = pointer to unit | |
| sw = switches | |
| Outputs: | |
| return = status code | |
| */ | |
| t_stat fprint_sym (FILE *of, t_addr addr, t_value *val, | |
| UNIT *uptr, int32 sw) | |
| { | |
| int32 i, c; | |
| uint32 inst, op, ea; | |
| inst = val[0]; | |
| if (sw & SWMASK ('A')) { /* alphabetic? */ | |
| if ((uptr == NULL) || !(uptr->flags & UNIT_ATT)) | |
| return SCPE_ARG; | |
| if (uptr->flags & UNIT_FLEX) { /* Flex file? */ | |
| c = flex_to_ascii[inst]; /* get ASCII equiv */ | |
| if (c <= 0) | |
| return SCPE_ARG; | |
| } | |
| else c = inst & 0x7F; /* ASCII file */ | |
| fputc (c, of); | |
| return SCPE_OK; | |
| } | |
| if (uptr && (uptr != &cpu_unit)) /* must be CPU */ | |
| return SCPE_ARG; | |
| if ((sw & SWMASK ('M')) && /* symbolic decode? */ | |
| ((inst & ~(SIGN|I_OP|I_EA)) == 0)) { | |
| op = I_GETOP (inst); | |
| ea = I_GETEA (inst); | |
| if (inst & SIGN) | |
| fputc ('-', of); | |
| fprintf (of, "%c ", opcode[op]); | |
| lgp_fprint_addr (of, sim_devices[0], ea); | |
| return SCPE_OK; | |
| } | |
| if ((sw & SWMASK ('L')) || /* LGP hex? */ | |
| ((cpu_unit.flags & UNIT_LGPH_D) && !(sw & SWMASK ('H')))) { | |
| for (i = 0; i < 8; i++) { | |
| c = (inst >> (4 * (7 - i))) & 0xF; | |
| fputc (hex_decode[c], of); | |
| } | |
| return SCPE_OK; | |
| } | |
| return SCPE_ARG; | |
| } | |
| /* Symbolic input | |
| Inputs: | |
| *cptr = pointer to input string | |
| addr = current PC | |
| *uptr = pointer to unit | |
| *val = pointer to output values | |
| sw = switches | |
| Outputs: | |
| status = error status | |
| */ | |
| t_stat parse_sym (char *cptr, t_addr addr, UNIT *uptr, t_value *val, int32 sw) | |
| { | |
| int32 i, c; | |
| char *tptr; | |
| while (isspace (*cptr)) /* absorb spaces */ | |
| cptr++; | |
| if ((sw & SWMASK ('A')) || ((*cptr == '\'') && cptr++)) { | |
| if ((uptr == NULL) || !(uptr->flags & UNIT_ATT)) | |
| return SCPE_ARG; | |
| if (uptr->flags & UNIT_FLEX) { /* Flex file? */ | |
| c = ascii_to_flex[*cptr & 0x7F]; /* get Flex equiv */ | |
| if (c < 0) | |
| return SCPE_ARG; | |
| val[0] = ((c >> 1) | (c << 5)) & 0x3F; /* transpose */ | |
| } | |
| else val[0] = *cptr & 0x7F; /* ASCII file */ | |
| return SCPE_OK; | |
| } | |
| if (uptr && (uptr != &cpu_unit)) /* must be CPU */ | |
| return SCPE_ARG; | |
| if (!parse_sym_m (cptr, val, sw)) /* symbolic parse? */ | |
| return SCPE_OK; | |
| if ((sw & SWMASK ('L')) || /* LGP hex? */ | |
| ((cpu_unit.flags & UNIT_LGPH_D) && !(sw & SWMASK ('H')))) { | |
| val[0] = 0; | |
| while (isspace (*cptr)) cptr++; /* absorb spaces */ | |
| for (i = 0; i < 8; i++) { | |
| c = *cptr++; /* get char */ | |
| if (c == 0) | |
| return SCPE_OK; | |
| if (islower (c)) | |
| c = toupper (c); | |
| if (tptr = strchr (hex_decode, c)) | |
| val[0] = (val[0] << 4) | (tptr - hex_decode); | |
| else return SCPE_ARG; | |
| } | |
| if (*cptr == 0) | |
| return SCPE_OK; | |
| } | |
| return SCPE_ARG; | |
| } | |
| /* Instruction parse */ | |
| t_stat parse_sym_m (char *cptr, t_value *val, int32 sw) | |
| { | |
| uint32 ea, sgn; | |
| char *tptr, gbuf[CBUFSIZE]; | |
| if (*cptr == '-') { | |
| cptr++; | |
| sgn = SIGN; | |
| } | |
| else sgn = 0; | |
| cptr = get_glyph (cptr, gbuf, 0); /* get opcode */ | |
| if (gbuf[1] != 0) | |
| return SCPE_ARG; | |
| if (tptr = strchr (opcode, gbuf[0])) | |
| val[0] = ((tptr - opcode) << I_V_OP) | sgn; /* merge opcode */ | |
| else return SCPE_ARG; | |
| cptr = get_glyph (cptr, gbuf, 0); /* get address */ | |
| ea = lgp_parse_addr (sim_devices[0], gbuf, &tptr); | |
| if ((tptr == gbuf) || (*tptr != 0) || (ea > AMASK)) | |
| return SCPE_ARG; | |
| val[0] = val[0] | (ea << I_V_EA); /* merge address */ | |
| if (*cptr != 0) | |
| return SCPE_2MARG; | |
| return SCPE_OK; | |
| } |