Mercurial > hg-old > index.cgi
annotate src/insn_rel.c @ 59:89657cb3fdf8
Moved insn_rel.c to simplified expression evaluation
| author | lost |
|---|---|
| date | Mon, 05 Jan 2009 00:40:58 +0000 |
| parents | 538e15927776 |
| children | a338d496350e |
| rev | line source |
|---|---|
| 29 | 1 /* |
| 2 insn_rel.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 |
| 29 | 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 relative mode instructions | |
| 23 */ | |
| 24 | |
| 32 | 25 #define __insn_rel_c_seen__ |
| 29 | 26 |
| 27 #include <stdlib.h> | |
| 28 | |
| 29 #include "expr.h" | |
| 30 #include "lwasm.h" | |
| 31 #include "instab.h" | |
| 32 | |
| 33 OPFUNC(insn_rel8) | |
| 34 { | |
| 35 int v; | |
| 36 | |
| 37 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 38 | |
| 59 | 39 if (lwasm_expr_result(as, l, p, EXPR_PASS2CONST, &v) < 0) |
| 29 | 40 { |
| 59 | 41 v = 0; |
| 29 | 42 } |
| 43 v -= as -> addr + 1; | |
| 44 if (v < -128 || v > 127) | |
| 45 register_error(as, l, 2, "Byte overflow"); | |
| 46 lwasm_emit(as, l, v & 0xff); | |
| 47 } | |
| 48 | |
| 49 OPFUNC(insn_rel16) | |
| 50 { | |
| 51 int v; | |
| 52 | |
| 53 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 54 | |
| 59 | 55 if (lwasm_expr_result(as, l, p, EXPR_PASS2CONST, &v) < 0) |
| 56 v = 0; | |
| 29 | 57 v -= as -> addr + 2; |
| 58 lwasm_emit(as, l, (v >> 8) & 0xff); | |
| 59 lwasm_emit(as, l, v & 0xff); | |
| 60 } |