1 // SPDX-License-Identifier: 0BSD
2
3 ///////////////////////////////////////////////////////////////////////////////
4 //
5 /// \file sparc.c
6 /// \brief Filter for SPARC binaries
7 ///
8 // Authors: Igor Pavlov
9 // Lasse Collin
10 //
11 ///////////////////////////////////////////////////////////////////////////////
12
13 #include "simple_private.h"
14
15
16 static size_t
sparc_code(void * simple lzma_attribute ((__unused__)),uint32_t now_pos,bool is_encoder,uint8_t * buffer,size_t size)17 sparc_code(void *simple lzma_attribute((__unused__)),
18 uint32_t now_pos, bool is_encoder,
19 uint8_t *buffer, size_t size)
20 {
21 size_t i;
22 for (i = 0; i + 4 <= size; i += 4) {
23
24 if ((buffer[i] == 0x40 && (buffer[i + 1] & 0xC0) == 0x00)
25 || (buffer[i] == 0x7F
26 && (buffer[i + 1] & 0xC0) == 0xC0)) {
27
28 uint32_t src = ((uint32_t)buffer[i + 0] << 24)
29 | ((uint32_t)buffer[i + 1] << 16)
30 | ((uint32_t)buffer[i + 2] << 8)
31 | ((uint32_t)buffer[i + 3]);
32
33 src <<= 2;
34
35 uint32_t dest;
36 if (is_encoder)
37 dest = now_pos + (uint32_t)(i) + src;
38 else
39 dest = src - (now_pos + (uint32_t)(i));
40
41 dest >>= 2;
42
43 dest = (((0 - ((dest >> 22) & 1)) << 22) & 0x3FFFFFFF)
44 | (dest & 0x3FFFFF)
45 | 0x40000000;
46
47 buffer[i + 0] = (uint8_t)(dest >> 24);
48 buffer[i + 1] = (uint8_t)(dest >> 16);
49 buffer[i + 2] = (uint8_t)(dest >> 8);
50 buffer[i + 3] = (uint8_t)(dest);
51 }
52 }
53
54 return i;
55 }
56
57
58 static lzma_ret
sparc_coder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters,bool is_encoder)59 sparc_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
60 const lzma_filter_info *filters, bool is_encoder)
61 {
62 return lzma_simple_coder_init(next, allocator, filters,
63 &sparc_code, 0, 4, 4, is_encoder);
64 }
65
66
67 #ifdef HAVE_ENCODER_SPARC
68 extern lzma_ret
lzma_simple_sparc_encoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)69 lzma_simple_sparc_encoder_init(lzma_next_coder *next,
70 const lzma_allocator *allocator,
71 const lzma_filter_info *filters)
72 {
73 return sparc_coder_init(next, allocator, filters, true);
74 }
75 #endif
76
77
78 #ifdef HAVE_DECODER_SPARC
79 extern lzma_ret
lzma_simple_sparc_decoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)80 lzma_simple_sparc_decoder_init(lzma_next_coder *next,
81 const lzma_allocator *allocator,
82 const lzma_filter_info *filters)
83 {
84 return sparc_coder_init(next, allocator, filters, false);
85 }
86 #endif
87