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 &= ~(size_t)15;
29
30 size_t i;
31 for (i = 0; i < size; i += 16) {
32 const uint32_t instr_template = buffer[i] & 0x1F;
33 const uint32_t mask = BRANCH_TABLE[instr_template];
34 uint32_t bit_pos = 5;
35
36 for (size_t slot = 0; slot < 3; ++slot, bit_pos += 41) {
37 if (((mask >> slot) & 1) == 0)
38 continue;
39
40 const size_t byte_pos = (bit_pos >> 3);
41 const uint32_t bit_res = bit_pos & 0x7;
42 uint64_t instruction = 0;
43
44 for (size_t j = 0; j < 6; ++j)
45 instruction += (uint64_t)(
46 buffer[i + j + byte_pos])
47 << (8 * j);
48
49 uint64_t inst_norm = instruction >> bit_res;
50
51 if (((inst_norm >> 37) & 0xF) == 0x5
52 && ((inst_norm >> 9) & 0x7) == 0
53 /* && (inst_norm & 0x3F)== 0 */
54 ) {
55 uint32_t src = (uint32_t)(
56 (inst_norm >> 13) & 0xFFFFF);
57 src |= ((inst_norm >> 36) & 1) << 20;
58
59 src <<= 4;
60
61 uint32_t dest;
62 if (is_encoder)
63 dest = now_pos + (uint32_t)(i) + src;
64 else
65 dest = src - (now_pos + (uint32_t)(i));
66
67 dest >>= 4;
68
69 inst_norm &= ~((uint64_t)(0x8FFFFF) << 13);
70 inst_norm |= (uint64_t)(dest & 0xFFFFF) << 13;
71 inst_norm |= (uint64_t)(dest & 0x100000)
72 << (36 - 20);
73
74 instruction &= (1U << bit_res) - 1;
75 instruction |= (inst_norm << bit_res);
76
77 for (size_t j = 0; j < 6; j++)
78 buffer[i + j + byte_pos] = (uint8_t)(
79 instruction
80 >> (8 * j));
81 }
82 }
83 }
84
85 return i;
86 }
87
88
89 static lzma_ret
ia64_coder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters,bool is_encoder)90 ia64_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
91 const lzma_filter_info *filters, bool is_encoder)
92 {
93 return lzma_simple_coder_init(next, allocator, filters,
94 &ia64_code, 0, 16, 16, is_encoder);
95 }
96
97
98 #ifdef HAVE_ENCODER_IA64
99 extern lzma_ret
lzma_simple_ia64_encoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)100 lzma_simple_ia64_encoder_init(lzma_next_coder *next,
101 const lzma_allocator *allocator,
102 const lzma_filter_info *filters)
103 {
104 return ia64_coder_init(next, allocator, filters, true);
105 }
106 #endif
107
108
109 #ifdef HAVE_DECODER_IA64
110 extern lzma_ret
lzma_simple_ia64_decoder_init(lzma_next_coder * next,const lzma_allocator * allocator,const lzma_filter_info * filters)111 lzma_simple_ia64_decoder_init(lzma_next_coder *next,
112 const lzma_allocator *allocator,
113 const lzma_filter_info *filters)
114 {
115 return ia64_coder_init(next, allocator, filters, false);
116 }
117 #endif
118