1 // SPDX-License-Identifier: 0BSD
2
3 ///////////////////////////////////////////////////////////////////////////////
4 //
5 /// \file ia64.c
6 /// \brief Filter for IA64 (Itanium) binaries
7 ///
8 // Authors: Igor Pavlov
9 // Lasse Collin
10 //
11 ///////////////////////////////////////////////////////////////////////////////
12
13 #include "simple_private.h"
14
15
16 static size_t
ia64_code(void * simple lzma_attribute ((__unused__)),uint32_t now_pos,bool is_encoder,uint8_t * buffer,size_t size)17 ia64_code(void *simple lzma_attribute((__unused__)),
18 uint32_t now_pos, bool is_encoder,
19 uint8_t *buffer, size_t size)
20 {
21 static const uint32_t BRANCH_TABLE[32] = {
22 0, 0, 0, 0, 0, 0, 0, 0,
23 0, 0, 0, 0, 0, 0, 0, 0,
24 4, 4, 6, 6, 0, 0, 7, 7,
25 4, 4, 0, 0, 4, 4, 0, 0
26 };
27
28 size_t i;
29 for (i = 0; i + 16 <= size; i += 16) {
30 const uint32_t instr_template = buffer[i] & 0x1F;
31 const uint32_t mask = BRANCH_TABLE[instr_template];
32 uint32_t bit_pos = 5;
33
34 for (size_t slot = 0; slot < 3; ++slot, bit_pos += 41) {
35 if (((mask >> slot) & 1) == 0)
36 continue;
37
38 const size_t byte_pos = (bit_pos >> 3);
39 const uint32_t bit_res = bit_pos & 0x7;
40 uint64_t instruction = 0;
41
42 for (size_t j = 0; j < 6; ++j)
43 instruction += (uint64_t)(
44 buffer[i + j + byte_pos])
45 << (8 * j);
46
47 uint64_t inst_norm = instruction >> bit_res;
48
49 if (((inst_norm >> 37) & 0xF) == 0x5
50 && ((inst_norm >> 9) & 0x7) == 0
51 /* && (inst_norm & 0x3F)== 0 */
52 ) {
53 uint32_t src = (uint32_t)(
54 (inst_norm >> 13) & 0xFFFFF);
55 src |= ((inst_norm >> 36) & 1) << 20;
56
57 src <<= 4;
58
59 uint32_t dest;
60 if (is_encoder)
61 dest = now_pos + (uint32_t)(i) + src;
62 else
63 dest = src - (now_pos + (uint32_t)(i));
64
65 dest >>= 4;
66
67 inst_norm &= ~((uint64_t)(0x8FFFFF) << 13);
68 inst_norm |= (uint64_t)(dest & 0xFFFFF) << 13;
69 inst_norm |= (uint64_t)(dest & 0x100000)
70 << (36 - 20);
71
72 instruction &= (1U << bit_res) - 1;
73 instruction |= (inst_norm << bit_res);
74
75 for (size_t j = 0; j < 6; j++)
76 buffer[i + j + byte_pos] = (uint8_t)(
77 instruction
78 >> (8 * j));
79 }
80 }
81 }
82
83 return i;
84 }
85
86
87 static lzma_ret
ia64_coder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters,bool is_encoder)88 ia64_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
89 const lzma_filter_info *filters, bool is_encoder)
90 {
91 return lzma_simple_coder_init(next, allocator, filters,
92 &ia64_code, 0, 16, 16, is_encoder);
93 }
94
95
96 #ifdef HAVE_ENCODER_IA64
97 extern lzma_ret
lzma_simple_ia64_encoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)98 lzma_simple_ia64_encoder_init(lzma_next_coder *next,
99 const lzma_allocator *allocator,
100 const lzma_filter_info *filters)
101 {
102 return ia64_coder_init(next, allocator, filters, true);
103 }
104 #endif
105
106
107 #ifdef HAVE_DECODER_IA64
108 extern lzma_ret
lzma_simple_ia64_decoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)109 lzma_simple_ia64_decoder_init(lzma_next_coder *next,
110 const lzma_allocator *allocator,
111 const lzma_filter_info *filters)
112 {
113 return ia64_coder_init(next, allocator, filters, false);
114 }
115 #endif
116