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#include "backend.h"
#include "gen_x86.h"
void cycles(cpu_options *opts, uint32_t num)
{
add_ir(&opts->code, num, opts->cycles, SZ_D);
}
void check_cycles_int(cpu_options *opts, uint32_t address)
{
code_info *code = &opts->code;
cmp_rr(code, opts->cycles, opts->limit, SZ_D);
code_ptr jmp_off = code->cur+1;
jcc(code, CC_NC, jmp_off+1);
mov_ir(code, address, opts->scratch1, SZ_D);
call(code, opts->handle_cycle_limit_int);
*jmp_off = code->cur - (jmp_off+1);
}
void check_cycles(cpu_options * opts)
{
code_info *code = &opts->code;
cmp_rr(code, opts->cycles, opts->limit, SZ_D);
check_alloc_code(code, MAX_INST_LEN*2);
code_ptr jmp_off = code->cur+1;
jcc(code, CC_NC, jmp_off+1);
call(code, opts->handle_cycle_limit);
*jmp_off = code->cur - (jmp_off+1);
}
void check_code_prologue(code_info *code)
{
check_alloc_code(code, MAX_INST_LEN*4);
}
code_ptr gen_mem_fun(cpu_options * opts, memmap_chunk const * memmap, uint32_t num_chunks, ftype fun_type, code_ptr *after_inc)
{
code_info *code = &opts->code;
code_ptr start = code->cur;
check_cycles(opts);
cycles(opts, opts->bus_cycles);
if (after_inc) {
*after_inc = code->cur;
}
if (opts->address_size == SZ_D && opts->address_mask < 0xFFFFFFFF) {
and_ir(code, opts->address_mask, opts->scratch1, SZ_D);
}
code_ptr lb_jcc = NULL, ub_jcc = NULL;
uint8_t is_write = fun_type == WRITE_16 || fun_type == WRITE_8;
uint8_t adr_reg = is_write ? opts->scratch2 : opts->scratch1;
uint16_t access_flag = is_write ? MMAP_WRITE : MMAP_READ;
uint8_t size = (fun_type == READ_16 || fun_type == WRITE_16) ? SZ_W : SZ_B;
for (uint32_t chunk = 0; chunk < num_chunks; chunk++)
{
if (memmap[chunk].start > 0) {
cmp_ir(code, memmap[chunk].start, adr_reg, opts->address_size);
lb_jcc = code->cur + 1;
jcc(code, CC_C, code->cur + 2);
}
if (memmap[chunk].end < opts->max_address) {
cmp_ir(code, memmap[chunk].end, adr_reg, opts->address_size);
ub_jcc = code->cur + 1;
jcc(code, CC_NC, code->cur + 2);
}
if (memmap[chunk].mask != opts->address_mask) {
and_ir(code, memmap[chunk].mask, adr_reg, opts->address_size);
}
void * cfun;
switch (fun_type)
{
case READ_16:
cfun = memmap[chunk].read_16;
break;
case READ_8:
cfun = memmap[chunk].read_8;
break;
case WRITE_16:
cfun = memmap[chunk].write_16;
break;
case WRITE_8:
cfun = memmap[chunk].write_8;
break;
default:
cfun = NULL;
}
if(memmap[chunk].flags & access_flag) {
if (memmap[chunk].flags & MMAP_PTR_IDX) {
if (memmap[chunk].flags & MMAP_FUNC_NULL) {
cmp_irdisp(code, 0, opts->context_reg, opts->mem_ptr_off + sizeof(void*) * memmap[chunk].ptr_index, SZ_PTR);
code_ptr not_null = code->cur + 1;
jcc(code, CC_NZ, code->cur + 2);
call(code, opts->save_context);
if (is_write) {
call_args_abi(code, cfun, 3, opts->scratch2, opts->context_reg, opts->scratch1);
mov_rr(code, RAX, opts->context_reg, SZ_PTR);
} else {
push_r(code, opts->context_reg);
call_args_abi(code, cfun, 2, opts->scratch1, opts->context_reg);
pop_r(code, opts->context_reg);
mov_rr(code, RAX, opts->scratch1, size);
}
jmp(code, opts->load_context);
*not_null = code->cur - (not_null + 1);
}
if ((opts->byte_swap || memmap[chunk].flags & MMAP_BYTESWAP) && size == SZ_B) {
xor_ir(code, 1, adr_reg, opts->address_size);
}
if (opts->address_size != SZ_D) {
movzx_rr(code, adr_reg, adr_reg, opts->address_size, SZ_D);
}
add_rdispr(code, opts->context_reg, opts->mem_ptr_off + sizeof(void*) * memmap[chunk].ptr_index, adr_reg, SZ_PTR);
if (is_write) {
mov_rrind(code, opts->scratch1, opts->scratch2, size);
} else {
mov_rindr(code, opts->scratch1, opts->scratch1, size);
}
} else {
uint8_t tmp_size = size;
if (size == SZ_B) {
if ((memmap[chunk].flags & MMAP_ONLY_ODD) || (memmap[chunk].flags & MMAP_ONLY_EVEN)) {
bt_ir(code, 0, adr_reg, opts->address_size);
code_ptr good_addr = code->cur + 1;
jcc(code, (memmap[chunk].flags & MMAP_ONLY_ODD) ? CC_C : CC_NC, code->cur + 2);
if (!is_write) {
mov_ir(code, 0xFF, opts->scratch1, SZ_B);
}
retn(code);
*good_addr = code->cur - (good_addr + 1);
shr_ir(code, 1, adr_reg, opts->address_size);
} else if (opts->byte_swap || memmap[chunk].flags & MMAP_BYTESWAP) {
xor_ir(code, 1, adr_reg, opts->address_size);
}
} else if ((memmap[chunk].flags & MMAP_ONLY_ODD) || (memmap[chunk].flags & MMAP_ONLY_EVEN)) {
tmp_size = SZ_B;
shr_ir(code, 1, adr_reg, opts->address_size);
if ((memmap[chunk].flags & MMAP_ONLY_EVEN) && is_write) {
shr_ir(code, 8, opts->scratch1, SZ_W);
}
}
if (opts->address_size != SZ_D) {
movzx_rr(code, adr_reg, adr_reg, opts->address_size, SZ_D);
}
if ((intptr_t)memmap[chunk].buffer <= 0x7FFFFFFF && (intptr_t)memmap[chunk].buffer >= -2147483648) {
if (is_write) {
mov_rrdisp(code, opts->scratch1, opts->scratch2, (intptr_t)memmap[chunk].buffer, tmp_size);
} else {
mov_rdispr(code, opts->scratch1, (intptr_t)memmap[chunk].buffer, opts->scratch1, tmp_size);
}
} else {
if (is_write) {
push_r(code, opts->scratch1);
mov_ir(code, (intptr_t)memmap[chunk].buffer, opts->scratch1, SZ_PTR);
add_rr(code, opts->scratch1, opts->scratch2, SZ_PTR);
pop_r(code, opts->scratch1);
mov_rrind(code, opts->scratch1, opts->scratch2, tmp_size);
} else {
mov_ir(code, (intptr_t)memmap[chunk].buffer, opts->scratch2, SZ_PTR);
mov_rindexr(code, opts->scratch2, opts->scratch1, 1, opts->scratch1, tmp_size);
}
}
if (size != tmp_size && !is_write) {
if (memmap[chunk].flags & MMAP_ONLY_EVEN) {
shl_ir(code, 8, opts->scratch1, SZ_W);
mov_ir(code, 0xFF, opts->scratch1, SZ_B);
} else {
or_ir(code, 0xFF00, opts->scratch1, SZ_W);
}
}
}
if (is_write && (memmap[chunk].flags & MMAP_CODE)) {
mov_rr(code, opts->scratch2, opts->scratch1, opts->address_size);
shr_ir(code, opts->ram_flags_shift, opts->scratch1, opts->address_size);
bt_rrdisp(code, opts->scratch1, opts->context_reg, opts->ram_flags_off, opts->address_size);
code_ptr not_code = code->cur + 1;
jcc(code, CC_NC, code->cur + 2);
call(code, opts->save_context);
call_args(code, opts->handle_code_write, 2, opts->scratch2, opts->context_reg);
mov_rr(code, RAX, opts->context_reg, SZ_PTR);
call(code, opts->load_context);
*not_code = code->cur - (not_code+1);
}
retn(code);
} else if (cfun) {
call(code, opts->save_context);
if (is_write) {
call_args_abi(code, cfun, 3, opts->scratch2, opts->context_reg, opts->scratch1);
mov_rr(code, RAX, opts->context_reg, SZ_PTR);
} else {
push_r(code, opts->context_reg);
call_args_abi(code, cfun, 2, opts->scratch1, opts->context_reg);
pop_r(code, opts->context_reg);
mov_rr(code, RAX, opts->scratch1, size);
}
jmp(code, opts->load_context);
} else {
//Not sure the best course of action here
if (!is_write) {
mov_ir(code, size == SZ_B ? 0xFF : 0xFFFF, opts->scratch1, size);
}
retn(code);
}
if (lb_jcc) {
*lb_jcc = code->cur - (lb_jcc+1);
lb_jcc = NULL;
}
if (ub_jcc) {
*ub_jcc = code->cur - (ub_jcc+1);
ub_jcc = NULL;
}
}
if (!is_write) {
mov_ir(code, size == SZ_B ? 0xFF : 0xFFFF, opts->scratch1, size);
}
retn(code);
return start;
}
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