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jit: Implement arm32 instruction decoding logic

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Introduces the core Arm32 decoder, including the instruction parsing
mechanism and an initial set of defined instructions.

Signed-off-by: Ronald Caesar <github43132@proton.me>
This commit is contained in:
Ronald Caesar 2025-10-19 00:33:42 -04:00
parent 2e2b5df20c
commit a0ed4382a5
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GPG key ID: 04307C401999C596
5 changed files with 308 additions and 337 deletions
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32
src/jit/decoder/arm32.h
View file

@ -7,22 +7,14 @@
namespace pound::jit::decoder
{
typedef uint32_t arm32_opcode_t;
typedef uint32_t arm32_instruction_t;
typedef struct arm32_decoder arm32_decoder_t;
typedef void (*arm32_handler_fn)(arm32_decoder_t* decoder, arm32_instruction_t instruction);
typedef void (*arm32_handler_fn)(arm32_decoder_t* decoder, uint32_t instruction);
typedef struct
{
const char* name;
arm32_opcode_t mask;
arm32_opcode_t expected;
arm32_handler_fn handler;
/* Use to order instructions in the lookup table. The more specific
* instructions are checked first */
uint8_t priority;
uint32_t mask;
uint32_t expected;
} arm32_instruction_info_t;
struct arm32_decoder
@ -31,23 +23,11 @@ struct arm32_decoder
arm32_instruction_info_t* instructions;
size_t instruction_count;
size_t instruction_capacity;
struct
{
arm32_instruction_info_t** bucket;
size_t count;
size_t capacity;
} lookup_table[4096]; /* 2^12 entries. */
};
extern arm32_decoder_t g_arm32_decoder;
void arm32_init(pound::host::memory::arena_t allocator, arm32_decoder_t* decoder);
void arm32_add_instruction(arm32_decoder_t* decoder, const char* name, arm32_opcode_t mask, arm32_opcode_t expected,
arm32_handler_fn handler);
void arm32_ADD_imm_handler(arm32_decoder_t* decoder, arm32_instruction_t instruction);
} // namespace pound::jit::decoder
#endif // POUND_JIT_DECODER_ARM32_H
arm32_instruction_info_t* arm32_decode(arm32_decoder_t* decoder, uint32_t instruction);
}
#endif // POUND_JIT_DECODER_ARM32_H