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