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annotate src/insn_tfm.c @ 263:16c73b13ee0b 2.6 2.6
Branched for 2.6 release
| author | lost |
|---|---|
| date | Tue, 22 Dec 2009 05:25:53 +0000 |
| parents | 74a3fef7c8d0 |
| children |
| rev | line source |
|---|---|
| 31 | 1 /* |
| 2 insn_tfm.c | |
|
33
74a3fef7c8d0
Added general addressing modes (immediate, base page, extended, indexed)
lost
parents:
32
diff
changeset
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3 Copyright © 2009 William Astle |
| 31 | 4 |
| 5 This file is part of LWASM. | |
| 6 | |
| 7 LWASM is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 */ | |
| 20 | |
| 21 /* | |
| 22 for handling inherent mode instructions | |
| 23 */ | |
| 24 | |
| 32 | 25 #define __insn_tfm_c_seen__ |
| 31 | 26 |
| 27 #include <ctype.h> | |
| 28 #include <string.h> | |
| 29 | |
| 30 #include "lwasm.h" | |
| 31 #include "instab.h" | |
| 32 | |
| 33 OPFUNC(insn_tfm) | |
| 34 { | |
| 35 static const char *reglist = "DXYUS AB 00EF"; | |
| 36 int r0, r1; | |
| 37 char *c; | |
| 38 int tfm = 0; | |
| 39 | |
| 40 c = strchr(reglist, toupper(*(*p)++)); | |
| 41 if (!c) | |
| 42 { | |
| 43 register_error(as, l, 1, "Unknown operation"); | |
| 44 return; | |
| 45 } | |
| 46 r0 = c - reglist; | |
| 47 if (**p == '+') | |
| 48 { | |
| 49 (*p)++; | |
| 50 tfm = 1; | |
| 51 } | |
| 52 else if (**p == '-') | |
| 53 { | |
| 54 (*p)++; | |
| 55 tfm = 2; | |
| 56 } | |
| 57 if (*(*p)++ != ',') | |
| 58 { | |
| 59 register_error(as, l, 1, "Unknown operation"); | |
| 60 return; | |
| 61 } | |
| 62 c = strchr(reglist, toupper(*(*p)++)); | |
| 63 if (!c) | |
| 64 { | |
| 65 register_error(as, l, 1, "Unknown operation"); | |
| 66 return; | |
| 67 } | |
| 68 r1 = c - reglist; | |
| 69 | |
| 70 if (**p == '+') | |
| 71 { | |
| 72 (*p)++; | |
| 73 tfm |= 4; | |
| 74 } | |
| 75 else if (**p == '-') | |
| 76 { | |
| 77 (*p)++; | |
| 78 tfm |= 8; | |
| 79 } | |
| 80 | |
| 81 if (**p && !isspace(**p)) | |
| 82 { | |
| 83 register_error(as, l, 1, "Bad operand"); | |
| 84 return; | |
| 85 } | |
| 86 | |
| 87 // valid values of tfm here are: | |
| 88 // 1: r0+,r1 (2) | |
| 89 // 4: r0,r1+ (3) | |
| 90 // 5: r0+,r1+ (0) | |
| 91 // 10: r0-,r1- (1) | |
| 92 switch (tfm) | |
| 93 { | |
| 94 case 5: //r0+,r1+ | |
| 95 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 96 break; | |
| 97 case 10: //r0-,r1- | |
| 98 lwasm_emitop(as, l, instab[opnum].ops[1]); | |
| 99 break; | |
| 100 case 1: // r0+,r1 | |
| 101 lwasm_emitop(as, l, instab[opnum].ops[2]); | |
| 102 break; | |
| 103 case 4: // r0,r1+ | |
| 104 lwasm_emitop(as, l, instab[opnum].ops[3]); | |
| 105 break; | |
| 106 default: | |
| 107 register_error(as, l, 1, "Unknown operation"); | |
| 108 return; | |
| 109 } | |
| 110 lwasm_emit(as, l, (r0 << 4) | r1); | |
| 111 } |