1 | /* ----------------------------------------------------------------------- * |
2 | * |
3 | * Copyright 2016-2017 The NASM Authors - All Rights Reserved |
4 | * See the file AUTHORS included with the NASM distribution for |
5 | * the specific copyright holders. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following |
9 | * conditions are met: |
10 | * |
11 | * * Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * * Redistributions in binary form must reproduce the above |
14 | * copyright notice, this list of conditions and the following |
15 | * disclaimer in the documentation and/or other materials provided |
16 | * with the distribution. |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
19 | * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
20 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
21 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
22 | * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
24 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
25 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
26 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
27 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
29 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, |
30 | * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
31 | * |
32 | * ----------------------------------------------------------------------- */ |
33 | |
34 | /* |
35 | * output/legacy.c |
36 | * |
37 | * Mangle a struct out_data to match the rather bizarre legacy |
38 | * backend interface. |
39 | * |
40 | * The "data" parameter for the output function points to a "int64_t", |
41 | * containing the address of the target in question, unless the type is |
42 | * OUT_RAWDATA, in which case it points to an "uint8_t" |
43 | * array. |
44 | * |
45 | * Exceptions are OUT_RELxADR, which denote an x-byte relocation |
46 | * which will be a relative jump. For this we need to know the |
47 | * distance in bytes from the start of the relocated record until |
48 | * the end of the containing instruction. _This_ is what is stored |
49 | * in the size part of the parameter, in this case. |
50 | * |
51 | * Also OUT_RESERVE denotes reservation of N bytes of BSS space, |
52 | * and the contents of the "data" parameter is irrelevant. |
53 | */ |
54 | |
55 | #include "nasm.h" |
56 | #include "outlib.h" |
57 | |
58 | void nasm_do_legacy_output(const struct out_data *data) |
59 | { |
60 | const void *dptr = data->data; |
61 | enum out_type type = data->type; |
62 | int32_t tsegment = data->tsegment; |
63 | int32_t twrt = data->twrt; |
64 | uint64_t size = data->size; |
65 | |
66 | switch (data->type) { |
67 | case OUT_RELADDR: |
68 | switch (data->size) { |
69 | case 1: |
70 | type = OUT_REL1ADR; |
71 | break; |
72 | case 2: |
73 | type = OUT_REL2ADR; |
74 | break; |
75 | case 4: |
76 | type = OUT_REL4ADR; |
77 | break; |
78 | case 8: |
79 | type = OUT_REL8ADR; |
80 | break; |
81 | default: |
82 | panic(); |
83 | break; |
84 | } |
85 | |
86 | dptr = &data->toffset; |
87 | size = data->relbase - data->offset; |
88 | break; |
89 | |
90 | case OUT_SEGMENT: |
91 | type = OUT_ADDRESS; |
92 | dptr = zero_buffer; |
93 | size = (data->sign == OUT_SIGNED) ? -data->size : data->size; |
94 | tsegment |= 1; |
95 | break; |
96 | |
97 | case OUT_ADDRESS: |
98 | dptr = &data->toffset; |
99 | size = (data->sign == OUT_SIGNED) ? -data->size : data->size; |
100 | break; |
101 | |
102 | case OUT_RAWDATA: |
103 | case OUT_RESERVE: |
104 | tsegment = twrt = NO_SEG; |
105 | break; |
106 | |
107 | case OUT_ZERODATA: |
108 | tsegment = twrt = NO_SEG; |
109 | type = OUT_RAWDATA; |
110 | dptr = zero_buffer; |
111 | while (size > ZERO_BUF_SIZE) { |
112 | ofmt->legacy_output(data->segment, dptr, type, |
113 | ZERO_BUF_SIZE, tsegment, twrt); |
114 | size -= ZERO_BUF_SIZE; |
115 | } |
116 | break; |
117 | |
118 | default: |
119 | panic(); |
120 | break; |
121 | } |
122 | |
123 | ofmt->legacy_output(data->segment, dptr, type, size, tsegment, twrt); |
124 | } |
125 | |