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annotate src/insn_bitbit.c @ 33:74a3fef7c8d0
Added general addressing modes (immediate, base page, extended, indexed)
| author | lost |
|---|---|
| date | Fri, 02 Jan 2009 05:02:47 +0000 |
| parents | 9bd0fbfe7405 |
| children | 538e15927776 |
| rev | line source |
|---|---|
| 32 | 1 /* |
| 2 insn_bitbit.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 |
| 32 | 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 | |
| 25 #define __insn_bitbit_c_seen__ | |
| 26 | |
| 27 #include <stdlib.h> | |
| 28 | |
| 29 #include "lwasm.h" | |
| 30 #include "instab.h" | |
| 31 #include "expr.h" | |
| 32 | |
| 33 OPFUNC(insn_bitbit) | |
| 34 { | |
| 35 int r; | |
| 36 lwasm_expr_stack_t *s; | |
| 37 int v1; | |
| 38 int tv; | |
| 39 | |
| 40 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 41 | |
| 42 r = toupper(*(*p)++); | |
| 43 if (r == 'A') | |
| 44 r = 1; | |
| 45 else if (r == 'B') | |
| 46 r = 2; | |
| 47 else if (r == 'C' && toupper(**p) == 'C') | |
| 48 { | |
| 49 r = 0; | |
| 50 (*p)++; | |
| 51 } | |
| 52 else | |
| 53 { | |
| 54 register_error(as, l, 1, "Bad register"); | |
| 55 return; | |
| 56 } | |
| 57 if (*(*p)++ != ',') | |
| 58 { | |
| 59 register_error(as, l, 1, "Bad operand"); | |
| 60 return; | |
| 61 } | |
| 62 s = lwasm_expr_eval(*p, NULL); | |
| 63 if (!s) | |
| 64 { | |
| 65 register_error(as, l, 1, "Bad operand"); | |
| 66 return; | |
| 67 } | |
| 68 if (!lwasm_expr_is_constant(s)) | |
| 69 { | |
| 70 register_error(as, l, 2, "Incomplete reference"); | |
| 71 } | |
| 72 v1 = lwasm_expr_get_value(s); | |
| 73 lwasm_expr_stack_free(s); | |
| 74 if (v1 < 0 || v1 > 7) | |
| 75 { | |
| 76 register_error(as, l, 2, "Invalid bit number"); | |
| 77 v1 = 0; | |
| 78 } | |
| 79 if (*(*p)++ != ',') | |
| 80 { | |
| 81 register_error(as, l, 1, "Bad operand"); | |
| 82 return; | |
| 83 } | |
| 84 r = (r << 6) | (v1 << 3); | |
| 85 | |
| 86 s = lwasm_expr_eval(*p, NULL); | |
| 87 if (!s) | |
| 88 { | |
| 89 register_error(as, l, 1, "Bad operand"); | |
| 90 return; | |
| 91 } | |
| 92 if (!lwasm_expr_is_constant(s)) | |
| 93 { | |
| 94 register_error(as, l, 1, "Incomplete reference"); | |
| 95 } | |
| 96 v1 = lwasm_expr_get_value(s); | |
| 97 lwasm_expr_stack_free(s); | |
| 98 if (v1 < 0 || v1 > 7) | |
| 99 { | |
| 100 register_error(as, l, 2, "Invalid bit number"); | |
| 101 v1 = 0; | |
| 102 } | |
| 103 if (*(*p)++ != ',') | |
| 104 { | |
| 105 register_error(as, l, 1, "Bad operand"); | |
| 106 return; | |
| 107 } | |
| 108 r |= v1; | |
| 109 | |
| 110 lwasm_emit(as, l, r); | |
| 111 | |
| 112 // ignore base page address modifier | |
| 113 if (**p == '<') | |
| 114 (*p)++; | |
| 115 | |
| 116 s = lwasm_expr_eval(*p, NULL); | |
| 117 if (!s) | |
| 118 { | |
| 119 register_error(as, l, 1, "Bad operand"); | |
| 120 return; | |
| 121 } | |
| 122 if (!lwasm_expr_is_constant(s)) | |
| 123 { | |
| 124 register_error(as, l, 1, "Incomplete reference"); | |
| 125 } | |
| 126 v1 = lwasm_expr_get_value(s); | |
| 127 lwasm_expr_stack_free(s); | |
| 128 v1 &= 0xFFFF; | |
| 129 | |
| 130 tv = v1 - ((as -> dpval) << 8); | |
| 131 if (tv > 0xFF || tv < 0) | |
| 132 { | |
| 133 register_error(as, l, 2, "Byte overflow"); | |
| 134 } | |
| 135 lwasm_emit(as, l, tv & 0xff); | |
| 136 } |