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      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
     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
     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
    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
    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