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Add ROM mirroring and fix mult. cycle count 

This should correct some minor issues in some games.
This commit is contained in:
David Guillen Fandos 2021-05-17 01:14:46 +02:00 committed by David G. F
parent 2877886ff1
commit aafde6de7b
3 changed files with 19 additions and 8 deletions
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2
arm/arm_emit.h
View File

@ -1239,12 +1239,10 @@ u32 execute_store_cpsr_body(u32 _cpsr, u32 store_mask, u32 address)
#define emit_trace_instruction(pc) \
generate_save_flags(); \
ARM_LDR_IMM(0, ARMREG_SP, reg_base, 34*4); \
ARM_STMDB_WB(0, ARMREG_SP, 0x500C); \
arm_load_imm_32bit(reg_a0, pc); \
generate_function_call(trace_instruction); \
ARM_LDMIA_WB(0, ARMREG_SP, 0x500C); \
arm_load_imm_32bit(ARMREG_SP, (u32)reg); \
generate_restore_flags();
#define emit_trace_thumb_instruction(pc) \
emit_trace_instruction(pc)

13
cpu_threaded.c
View File

@ -297,6 +297,7 @@ void translate_icache_sync() {
{ \
/* MUL rd, rm, rs */ \
arm_multiply(no, no); \
cycle_count += 2; /* variable 1..4, pick 2 as an aprox. */ \
} \
} \
else \
@ -314,6 +315,7 @@ void translate_icache_sync() {
case 0: \
/* MULS rd, rm, rs */ \
arm_multiply(no, yes); \
cycle_count += 2; /* variable 1..4, pick 2 as an aprox. */ \
break; \
\
case 1: \
@ -351,6 +353,7 @@ void translate_icache_sync() {
{ \
/* MLA rd, rm, rs, rn */ \
arm_multiply(yes, no); \
cycle_count += 3; /* variable 2..5, pick 3 as an aprox. */ \
} \
} \
else \
@ -368,6 +371,7 @@ void translate_icache_sync() {
case 0: \
/* MLAS rd, rm, rs, rn */ \
arm_multiply(yes, yes); \
cycle_count += 3; /* variable 2..5, pick 3 as an aprox. */ \
break; \
\
case 1: \
@ -487,6 +491,7 @@ void translate_icache_sync() {
{ \
/* UMULL rd, rm, rs */ \
arm_multiply_long(u64, no, no); \
cycle_count += 3; /* this is an aproximation :P */ \
} \
} \
else \
@ -504,6 +509,7 @@ void translate_icache_sync() {
case 0: \
/* UMULLS rdlo, rdhi, rm, rs */ \
arm_multiply_long(u64, no, yes); \
cycle_count += 3; /* this is an aproximation :P */ \
break; \
\
case 1: \
@ -541,6 +547,7 @@ void translate_icache_sync() {
{ \
/* UMLAL rd, rm, rs */ \
arm_multiply_long(u64_add, yes, no); \
cycle_count += 3; /* Between 2 and 5 cycles? */ \
} \
} \
else \
@ -558,6 +565,7 @@ void translate_icache_sync() {
case 0: \
/* UMLALS rdlo, rdhi, rm, rs */ \
arm_multiply_long(u64_add, yes, yes); \
cycle_count += 3; /* Between 2 and 5 cycles? */ \
break; \
\
case 1: \
@ -595,6 +603,7 @@ void translate_icache_sync() {
{ \
/* SMULL rd, rm, rs */ \
arm_multiply_long(s64, no, no); \
cycle_count += 2; /* Between 1 and 4 cycles? */ \
} \
} \
else \
@ -612,6 +621,7 @@ void translate_icache_sync() {
case 0: \
/* SMULLS rdlo, rdhi, rm, rs */ \
arm_multiply_long(s64, no, yes); \
cycle_count += 2; /* Between 1 and 4 cycles? */ \
break; \
\
case 1: \
@ -649,6 +659,7 @@ void translate_icache_sync() {
{ \
/* SMLAL rd, rm, rs */ \
arm_multiply_long(s64_add, yes, no); \
cycle_count += 3; /* Between 2 and 5 cycles? */ \
} \
} \
else \
@ -666,6 +677,7 @@ void translate_icache_sync() {
case 0: \
/* SMLALS rdlo, rdhi, rm, rs */ \
arm_multiply_long(s64_add, yes, yes); \
cycle_count += 3; /* Between 2 and 5 cycles? */ \
break; \
\
case 1: \
@ -1870,6 +1882,7 @@ void translate_icache_sync() {
case 0x01: \
/* MUL rd, rs */ \
thumb_data_proc(alu_op, muls, reg, rd, rd, rs); \
cycle_count += 2; /* Between 1 and 4 extra cycles */ \
break; \
\
case 0x02: \

12
gba_memory.c
View File

@ -3155,12 +3155,12 @@ static void init_memory_gamepak(void)
}
else
{
map_region(read, 0x8000000, 0x8000000 + gamepak_size, 1024, gamepak_rom);
map_null(read, 0x8000000 + gamepak_size, 0xA000000);
map_region(read, 0xA000000, 0xA000000 + gamepak_size, 1024, gamepak_rom);
map_null(read, 0xA000000 + gamepak_size, 0xC000000);
map_region(read, 0xC000000, 0xC000000 + gamepak_size, 1024, gamepak_rom);
map_null(read, 0xC000000 + gamepak_size, 0xE000000);
/* Map the ROM using mirroring, not many games use it */
unsigned numblocks = gamepak_size >> 15;
map_region(read, 0x8000000, 0xA000000, numblocks, gamepak_rom);
map_region(read, 0xA000000, 0xC000000, numblocks, gamepak_rom);
map_region(read, 0xC000000, 0xD000000, numblocks, gamepak_rom);
/* Do not map D-E regions since they are also used for FLASH */
}
}