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jit: Add more foundational code

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Strengthens the decoder's foundation but does not yet implement the core
instruction lookup table logic or the public arm32_decode API. These
will be addressed in future patches.

Signed-off-by: Ronald Caesar <github43132@proton.me>
This commit is contained in:
Ronald Caesar 2025-10-12 20:01:48 -04:00
parent 09da076aaf
commit 7aac83b2f2
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GPG key ID: 04307C401999C596
4 changed files with 138 additions and 17 deletions
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21
src/jit/decoder/arm32.h
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@ -3,30 +3,31 @@
#include <stddef.h>
#include <stdint.h>
#include "host/memory/arena.h"
namespace pound::jit::decoder
{
typedef uint32_t arm32_opcode_t;
typedef uint32_t arm32_instruction_t;
typedef struct arm32_instruction_info arm32_instruction_info_t;
typedef struct arm32_decoder arm32_decoder_t;
extern arm32_decoder_t g_arm32_decoder;
typedef void (*arm32_handler_fn)(arm32_decoder_t* decoder, arm32_instruction_t instruction);
struct a32_instruction_info
typedef struct
{
const char* name;
arm32_opcode_t mask;
arm32_opcode_t expected;
arm32_handler_fn handler;
uint8_t priority; /* Higher = more specific */
};
/* Use to order instructions in the lookup table. The more specific
* instructions are checked first */
uint8_t priority;
} arm32_instruction_info_t;
struct arm32_decoder
{
pound::host::memory::arena_t allocator;
arm32_instruction_info_t* instructions;
size_t instruction_count;
size_t instruction_capacity;
@ -39,9 +40,11 @@ struct arm32_decoder
} lookup_table[4096]; /* 2^12 entries. */
};
void arm32_init(arm32_decoder_t* decoder);
extern arm32_decoder_t g_arm32_decoder;
void arm32_add_instruction(arm32_decoder_t* decoder, const char* nane, arm32_opcode_t mask, arm32_opcode_t expected,
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);