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annotate lwasm/insn_rel.c @ 208:06effa2faea1
Added some info on building gcc6809 to use lwtools
| author | lost |
|---|---|
| date | Tue, 21 Apr 2009 02:57:37 +0000 |
| parents | e7309c716059 |
| children | bae1e3ecdce1 |
| rev | line source |
|---|---|
| 29 | 1 /* |
| 2 insn_rel.c | |
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Added general addressing modes (immediate, base page, extended, indexed)
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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; | |
| 77 | 36 lwasm_expr_term_t *t; |
| 37 int r; | |
| 29 | 38 |
| 39 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 77 | 40 |
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41 if (**p == '#') |
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42 (*p)++; |
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43 |
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44 if ((r = lwasm_expr_result2(as, l, p, EXPR_SECTCONST, &v, 0)) < 0) |
| 77 | 45 v = 0; |
| 46 else | |
| 29 | 47 { |
| 77 | 48 if (as -> passnum == 1) |
| 49 { | |
| 50 // need to adjust the expression | |
| 51 if (l -> exprs[0]) | |
| 52 { | |
| 53 t = lwasm_expr_term_create_int(as -> addr + 1); | |
| 54 lwasm_expr_stack_push(l -> exprs[0], t); | |
| 55 lwasm_expr_term_free(t); | |
| 56 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); | |
| 57 lwasm_expr_stack_push(l -> exprs[0], t); | |
| 58 lwasm_expr_term_free(t); | |
| 59 } | |
| 60 else | |
| 61 { | |
| 62 l -> exprvals[0] -= as -> addr + 1; | |
| 63 } | |
| 64 } | |
| 29 | 65 } |
| 77 | 66 if (r == 1 && as -> passnum == 2) |
| 67 { | |
| 68 register_error(as, l, 2, "Illegal external or intersegment reference"); | |
| 69 } | |
| 29 | 70 if (v < -128 || v > 127) |
| 71 register_error(as, l, 2, "Byte overflow"); | |
| 72 lwasm_emit(as, l, v & 0xff); | |
| 73 } | |
| 74 | |
| 77 | 75 /* |
| 76 External and intersegment references are adjusted for the relative addressing mode | |
| 77 by adjusting the expression on pass 1 and then treated as absolute references later | |
| 78 */ | |
| 29 | 79 OPFUNC(insn_rel16) |
| 80 { | |
| 81 int v; | |
| 77 | 82 int r; |
| 83 lwasm_expr_term_t *t; | |
| 29 | 84 |
| 85 lwasm_emitop(as, l, instab[opnum].ops[0]); | |
| 86 | |
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87 if (**p == '#') |
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88 (*p)++; |
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89 |
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90 r = lwasm_expr_result2(as, l, p, EXPR_SECTCONST, &v, 0); |
| 83 | 91 if (r < 0) |
| 59 | 92 v = 0; |
| 77 | 93 else |
| 94 { | |
| 95 if (as -> passnum == 1) | |
| 96 { | |
| 97 // need to adjust the expression | |
| 98 if (l -> exprs[0]) | |
| 99 { | |
| 83 | 100 t = lwasm_expr_term_create_int(as -> addr + 2); |
| 77 | 101 lwasm_expr_stack_push(l -> exprs[0], t); |
| 102 lwasm_expr_term_free(t); | |
| 103 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); | |
| 104 lwasm_expr_stack_push(l -> exprs[0], t); | |
| 105 lwasm_expr_term_free(t); | |
| 106 } | |
| 107 else | |
| 108 { | |
| 109 l -> exprvals[0] -= as -> addr + 2; | |
| 110 } | |
| 111 } | |
| 112 } | |
| 113 if (as -> passnum == 2 && r == 1) | |
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114 { |
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115 // since we have a reference outside this section, add |
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116 // a subtract of the section base to get the right value |
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117 // upon linking |
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118 t = lwasm_expr_term_create_secbase(); |
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119 lwasm_expr_stack_push(l -> exprs[0], t); |
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120 lwasm_expr_term_free(t); |
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121 t = lwasm_expr_term_create_oper(LWASM_OPER_MINUS); |
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122 lwasm_expr_stack_push(l -> exprs[0], t); |
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123 lwasm_expr_term_free(t); |
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124 |
| 77 | 125 l -> relocoff = as -> addr - l -> codeaddr; |
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126 } |
| 29 | 127 lwasm_emit(as, l, (v >> 8) & 0xff); |
| 128 lwasm_emit(as, l, v & 0xff); | |
| 129 } |