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
      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
      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  #ifdef HAVE_ENCODER_IA64
      98  extern lzma_ret
      99  lzma_simple_ia64_encoder_init(lzma_next_coder *next,
     100  		const lzma_allocator *allocator,
     101  		const lzma_filter_info *filters)
     102  {
     103  	return ia64_coder_init(next, allocator, filters, true);
     104  }
     105  #endif
     106  
     107  
     108  #ifdef HAVE_DECODER_IA64
     109  extern lzma_ret
     110  lzma_simple_ia64_decoder_init(lzma_next_coder *next,
     111  		const lzma_allocator *allocator,
     112  		const lzma_filter_info *filters)
     113  {
     114  	return ia64_coder_init(next, allocator, filters, false);
     115  }
     116  #endif