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https://github.com/pound-emu/pound.git
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2b5131e56c
Major architectural refactorbto focus exclusively on JIT development.
JIT & Decoder Architecture
- Implemented scripts/generate_jit_decoder_a32_table.py to parse
instruction definitions at build-time rather than runtime.
- Moves decoder lookup tables from RAM to ROM.
Scope Reduction:
- Removed frontend, GUI, and rendering dependencies.
- delete src/frontend, src/target, and associated design docs.
Most importantly, this commit starts the transition of this codebase
from C++ to C. I cant stand creating C++ code, and since no one else
is contributing to this project this change shouldnt matter.
Signed-off-by: Ronald Caesar <github43132@proton.me>
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
#include "arm32.h"
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#include "arm32_table_generated.h"
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#include "common/passert.h"
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#include <string.h>
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#include <stdbool.h>
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#define LOG_MODULE "jit"
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#include "common/logging.h"
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const pvm_jit_decoder_arm32_instruction_info_t *
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pvm_jit_decoder_arm32_decode (const uint32_t instruction)
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{
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/* Extract hash key: Bits [27:20] and [7:4] */
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const uint32_t major = (instruction >> 20U) & 0xFFU;
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const uint32_t minor = (instruction >> 4U) & 0xFU;
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const uint16_t index = (uint16_t)((major << 4U) | minor);
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const decode_bucket_t *bucket = &g_decoder_lookup_table[index];
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for (size_t i = 0; i < bucket->count; ++i)
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{
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const pvm_jit_decoder_arm32_instruction_info_t *info = bucket->instructions[i];
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if ((instruction & info->mask) == info->expected)
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{
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if (0 == strcmp(info->name, "UDF"))
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{
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LOG_WARNING("Instruction 0x%08X is undefined", instruction);
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}
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else
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{
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LOG_TRACE("Instruction found for 0x%08X: %s", instruction, info->name);
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}
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return info;
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}
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}
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LOG_WARNING("Cannot decode instruction 0x%08X", instruction);
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return NULL;
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}
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