111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file ia64.c
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/// \brief Filter for IA64 (Itanium) binaries
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///
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// Authors: Igor Pavlov
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// Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "simple_private.h"
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static size_t
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ia64_code(lzma_simple *simple lzma_attribute((__unused__)),
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uint32_t now_pos, bool is_encoder,
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uint8_t *buffer, size_t size)
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{
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static const uint32_t BRANCH_TABLE[32] = {
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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4, 4, 6, 6, 0, 0, 7, 7,
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4, 4, 0, 0, 4, 4, 0, 0
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};
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size_t i;
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for (i = 0; i + 16 <= size; i += 16) {
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const uint32_t instr_template = buffer[i] & 0x1F;
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const uint32_t mask = BRANCH_TABLE[instr_template];
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uint32_t bit_pos = 5;
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for (size_t slot = 0; slot < 3; ++slot, bit_pos += 41) {
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if (((mask >> slot) & 1) == 0)
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continue;
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const size_t byte_pos = (bit_pos >> 3);
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const uint32_t bit_res = bit_pos & 0x7;
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uint64_t instruction = 0;
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for (size_t j = 0; j < 6; ++j)
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instruction += (uint64_t)(
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buffer[i + j + byte_pos])
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<< (8 * j);
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uint64_t inst_norm = instruction >> bit_res;
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if (((inst_norm >> 37) & 0xF) == 0x5
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&& ((inst_norm >> 9) & 0x7) == 0
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/* && (inst_norm & 0x3F)== 0 */
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) {
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uint32_t src = (uint32_t)(
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(inst_norm >> 13) & 0xFFFFF);
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src |= ((inst_norm >> 36) & 1) << 20;
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src <<= 4;
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uint32_t dest;
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if (is_encoder)
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dest = now_pos + (uint32_t)(i) + src;
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else
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dest = src - (now_pos + (uint32_t)(i));
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dest >>= 4;
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inst_norm &= ~((uint64_t)(0x8FFFFF) << 13);
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inst_norm |= (uint64_t)(dest & 0xFFFFF) << 13;
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inst_norm |= (uint64_t)(dest & 0x100000)
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<< (36 - 20);
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instruction &= (1 << bit_res) - 1;
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instruction |= (inst_norm << bit_res);
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for (size_t j = 0; j < 6; j++)
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buffer[i + j + byte_pos] = (uint8_t)(
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instruction
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>> (8 * j));
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}
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}
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}
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return i;
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}
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static lzma_ret
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ia64_coder_init(lzma_next_coder *next, lzma_allocator *allocator,
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const lzma_filter_info *filters, bool is_encoder)
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{
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return lzma_simple_coder_init(next, allocator, filters,
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&ia64_code, 0, 16, 16, is_encoder);
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}
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extern lzma_ret
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lzma_simple_ia64_encoder_init(lzma_next_coder *next,
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lzma_allocator *allocator, const lzma_filter_info *filters)
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{
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return ia64_coder_init(next, allocator, filters, true);
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}
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extern lzma_ret
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lzma_simple_ia64_decoder_init(lzma_next_coder *next,
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lzma_allocator *allocator, const lzma_filter_info *filters)
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{
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return ia64_coder_init(next, allocator, filters, false);
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}
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