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https://github.com/sarah-walker-pcem/pcem.git
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91 lines
3.4 KiB
C
91 lines
3.4 KiB
C
#ifndef _CODEGEN_BACKEND_X86_64_OPS_HELPERS_H_
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#define _CODEGEN_BACKEND_X86_64_OPS_HELPERS_H_
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#define JMP_LEN_BYTES 5
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static inline void codegen_addbyte(codeblock_t *block, uint8_t val) {
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if (block_pos >= BLOCK_MAX) {
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fatal("codegen_addbyte over! %i\n", block_pos);
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// CPU_BLOCK_END();
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}
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block_write_data[block_pos++] = val;
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}
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static inline void codegen_addbyte2(codeblock_t *block, uint8_t vala, uint8_t valb) {
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if (block_pos > (BLOCK_MAX - 2)) {
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fatal("codegen_addbyte2 over! %i\n", block_pos);
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CPU_BLOCK_END();
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}
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block_write_data[block_pos++] = vala;
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block_write_data[block_pos++] = valb;
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}
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static inline void codegen_addbyte3(codeblock_t *block, uint8_t vala, uint8_t valb, uint8_t valc) {
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if (block_pos > (BLOCK_MAX - 3)) {
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fatal("codegen_addbyte3 over! %i\n", block_pos);
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CPU_BLOCK_END();
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}
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block_write_data[block_pos++] = vala;
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block_write_data[block_pos++] = valb;
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block_write_data[block_pos++] = valc;
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}
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static inline void codegen_addbyte4(codeblock_t *block, uint8_t vala, uint8_t valb, uint8_t valc, uint8_t vald) {
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if (block_pos > (BLOCK_MAX - 4)) {
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fatal("codegen_addbyte4 over! %i\n", block_pos);
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CPU_BLOCK_END();
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}
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block_write_data[block_pos++] = vala;
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block_write_data[block_pos++] = valb;
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block_write_data[block_pos++] = valc;
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block_write_data[block_pos++] = vald;
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}
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static inline void codegen_addword(codeblock_t *block, uint16_t val) {
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if (block_pos > (BLOCK_MAX - 2)) {
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fatal("codegen_addword over! %i\n", block_pos);
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CPU_BLOCK_END();
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}
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*(uint16_t *)&block_write_data[block_pos] = val;
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block_pos += 2;
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}
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static inline void codegen_addlong(codeblock_t *block, uint32_t val) {
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if (block_pos > (BLOCK_MAX - 4)) {
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fatal("codegen_addlong over! %i\n", block_pos);
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CPU_BLOCK_END();
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}
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*(uint32_t *)&block_write_data[block_pos] = val;
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block_pos += 4;
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}
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static inline void codegen_addquad(codeblock_t *block, uint64_t val) {
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if (block_pos > (BLOCK_MAX - 8)) {
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fatal("codegen_addquad over! %i\n", block_pos);
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CPU_BLOCK_END();
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}
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*(uint64_t *)&block_write_data[block_pos] = val;
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block_pos += 8;
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}
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static inline void codegen_alloc_bytes(codeblock_t *block, int size) {
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if (block_pos > ((BLOCK_MAX - size) - JMP_LEN_BYTES)) {
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/*Current block is full. Allocate a new block*/
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struct mem_block_t *new_block = codegen_allocator_allocate(block->head_mem_block, get_block_nr(block));
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uint8_t *new_ptr = codeblock_allocator_get_ptr(new_block);
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/*Add a jump instruction to the new block*/
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codegen_addbyte(block, 0xe9); /*JMP*/
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codegen_addlong(block, (uintptr_t)new_ptr - (uintptr_t)&block_write_data[block_pos + 4]);
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/*Set write address to start of new block*/
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block_pos = 0;
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block_write_data = new_ptr;
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}
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}
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static inline int is_imm8(uint32_t imm_data) {
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if (imm_data <= 0x7f || imm_data >= 0xffffff80)
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return 1;
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return 0;
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}
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#endif /* _CODEGEN_BACKEND_X86_64_OPS_HELPERS_H_ */
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