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// SPDX-License-Identifier: 0BSD
///////////////////////////////////////////////////////////////////////////////
//
/// \file ia64.c
/// \brief Filter for IA64 (Itanium) binaries
///
// Authors: Igor Pavlov
// Lasse Collin
//
///////////////////////////////////////////////////////////////////////////////
#include "simple_private.h"
static size_t
ia64_code(void *simple lzma_attribute((__unused__)),
uint32_t now_pos, bool is_encoder,
uint8_t *buffer, size_t size)
{
static const uint32_t BRANCH_TABLE[32] = {
0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0,
4, 4, 6, 6, 0, 0, 7, 7,
4, 4, 0, 0, 4, 4, 0, 0
};
size_t i;
for (i = 0; i + 16 <= size; i += 16) {
const uint32_t instr_template = buffer[i] & 0x1F;
const uint32_t mask = BRANCH_TABLE[instr_template];
uint32_t bit_pos = 5;
for (size_t slot = 0; slot < 3; ++slot, bit_pos += 41) {
if (((mask >> slot) & 1) == 0)
continue;
const size_t byte_pos = (bit_pos >> 3);
const uint32_t bit_res = bit_pos & 0x7;
uint64_t instruction = 0;
for (size_t j = 0; j < 6; ++j)
instruction += (uint64_t)(
buffer[i + j + byte_pos])
<< (8 * j);
uint64_t inst_norm = instruction >> bit_res;
if (((inst_norm >> 37) & 0xF) == 0x5
&& ((inst_norm >> 9) & 0x7) == 0
/* && (inst_norm & 0x3F)== 0 */
) {
uint32_t src = (uint32_t)(
(inst_norm >> 13) & 0xFFFFF);
src |= ((inst_norm >> 36) & 1) << 20;
src <<= 4;
uint32_t dest;
if (is_encoder)
dest = now_pos + (uint32_t)(i) + src;
else
dest = src - (now_pos + (uint32_t)(i));
dest >>= 4;
inst_norm &= ~((uint64_t)(0x8FFFFF) << 13);
inst_norm |= (uint64_t)(dest & 0xFFFFF) << 13;
inst_norm |= (uint64_t)(dest & 0x100000)
<< (36 - 20);
instruction &= (1U << bit_res) - 1;
instruction |= (inst_norm << bit_res);
for (size_t j = 0; j < 6; j++)
buffer[i + j + byte_pos] = (uint8_t)(
instruction
>> (8 * j));
}
}
}
return i;
}
static lzma_ret
ia64_coder_init(lzma_next_coder *next, const lzma_allocator *allocator,
const lzma_filter_info *filters, bool is_encoder)
{
return lzma_simple_coder_init(next, allocator, filters,
&ia64_code, 0, 16, 16, is_encoder);
}
#ifdef HAVE_ENCODER_IA64
extern lzma_ret
lzma_simple_ia64_encoder_init(lzma_next_coder *next,
const lzma_allocator *allocator,
const lzma_filter_info *filters)
{
return ia64_coder_init(next, allocator, filters, true);
}
#endif
#ifdef HAVE_DECODER_IA64
extern lzma_ret
lzma_simple_ia64_decoder_init(lzma_next_coder *next,
const lzma_allocator *allocator,
const lzma_filter_info *filters)
{
return ia64_coder_init(next, allocator, filters, false);
}
#endif
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