From b71d436a54459688bf637e98eaf371def182ac9c Mon Sep 17 00:00:00 2001 From: notaz Date: Thu, 16 Nov 2023 23:23:05 +0200 Subject: [PATCH] psxbios: handle direct bios table calls libretro/pcsx_rearmed#797 --- libpcsxcore/psxbios.c | 96 +++++++++++++++++++++++++++++++++---------- libpcsxcore/psxhle.h | 4 +- 2 files changed, 78 insertions(+), 22 deletions(-) diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c index 3671af5a..56239f20 100644 --- a/libpcsxcore/psxbios.c +++ b/libpcsxcore/psxbios.c @@ -303,10 +303,10 @@ static u32 floodchk; #define A_CD_EVENTS 0xb9b8 #define A_EXC_GP 0xf450 -#define A_A0_DUMMY 0x1010 -#define A_B0_DUMMY 0x2010 -#define A_C0_DUMMY 0x3010 -#define A_B0_5B_DUMMY 0x43d0 +#define A_A0_TRAPS 0x1010 +#define A_B0_TRAPS 0x2010 +#define A_C0_TRAPS 0x3010 +#define A_B0_5B_TRAP 0x43d0 #define HLEOP(n) SWAPu32((0x3b << 26) | (n)); @@ -3752,18 +3752,25 @@ void psxBiosInit() { // fill the api jumptables with fake entries as some games patch them // (or rather the funcs listed there) + // also trap the destination as some "Cheats Edition" thing overrides the + // dispatcher with a wrapper and then jumps to the table entries directly ptr = (u32 *)&psxM[A_A0_TABLE]; - for (i = 0; i < 256; i++) - ptr[i] = SWAP32(A_A0_DUMMY); - + for (i = 0; i < 256; i++) { + ptr[i] = SWAP32(A_A0_TRAPS + i*4); + ram32[A_A0_TRAPS/4 + i] = HLEOP(hleop_a0t); + } ptr = (u32 *)&psxM[A_B0_TABLE]; - for (i = 0; i < 256; i++) - ptr[i] = SWAP32(A_B0_DUMMY); + for (i = 0; i < 256; i++) { + ptr[i] = SWAP32(A_B0_TRAPS + i*4); + ram32[A_B0_TRAPS/4 + i] = HLEOP(hleop_b0t); + } // B(5b) is special because games patch (sometimes even jump to) // code at fixed offsets from it, nocash lists offsets: // patch: +3d8, +4dc, +594, +62c, +9c8, +1988 // call: +7a0=4b70, +884=4c54, +894=4c64 - ptr[0x5b] = SWAP32(A_B0_5B_DUMMY); // 0x43d0 + ptr[0x5b] = SWAP32(A_B0_5B_TRAP); // 0x43d0 + ram32[A_B0_5B_TRAP/4] = HLEOP(hleop_b0t); + ram32[0x4b70/4] = SWAP32(0x03e00008); // jr $ra // setPadOutputBuf ram32[0x4c54/4] = SWAP32(0x240e0001); // mov $t6, 1 @@ -3774,15 +3781,17 @@ void psxBiosInit() { ram32[0x4c68/4] = SWAP32(0xac000000 + A_PAD_IRQR_ENA); // sw $0, ... ptr = (u32 *)&psxM[A_C0_TABLE]; - for (i = 0; i < 256/2; i++) - ptr[i] = SWAP32(A_C0_DUMMY); + for (i = 0; i < 256/2; i++) { + ptr[i] = SWAP32(A_C0_TRAPS + i*4); + ram32[A_C0_TRAPS/4 + i] = HLEOP(hleop_c0t); + } ptr[6] = SWAP32(A_EXCEPTION); // more HLE traps - ram32[A_A0_DUMMY/4] = HLEOP(hleop_dummy); - ram32[A_B0_DUMMY/4] = HLEOP(hleop_dummy); - ram32[A_C0_DUMMY/4] = HLEOP(hleop_dummy); - ram32[A_B0_5B_DUMMY/4] = HLEOP(hleop_dummy); + ram32[A_A0_TRAPS/4 - 1] = HLEOP(hleop_dummy); + ram32[A_B0_TRAPS/4 - 1] = HLEOP(hleop_dummy); + ram32[A_C0_TRAPS/4 - 1] = HLEOP(hleop_dummy); + ram32[0x7ffc/4] = HLEOP(hleop_dummy); ram32[0x8000/4] = HLEOP(hleop_execret); ram32[A_EEXIT_PTR/4] = SWAP32(A_EEXIT_DEF); @@ -4097,7 +4106,8 @@ static void hleA0() { u32 call = t1 & 0xff; u32 entry = loadRam32(A_A0_TABLE + call * 4); - if (call < 192 && entry != A_A0_DUMMY) { + use_cycles(4+7); + if (call < 192 && entry != A_A0_TRAPS + call * 4) { PSXBIOS_LOG("custom A%02x %s(0x%x, ) addr=%08x ra=%08x\n", call, biosA0n[call], a0, entry, ra); softCall(entry); @@ -4116,10 +4126,11 @@ static void hleB0() { u32 entry = loadRam32(A_B0_TABLE + call * 4); int is_custom = 0; + use_cycles(4+7); if (call == 0x5b) - is_custom = entry != A_B0_5B_DUMMY; + is_custom = entry != A_B0_5B_TRAP; else - is_custom = entry != A_B0_DUMMY; + is_custom = entry != A_B0_TRAPS + call * 4; if (is_custom) { PSXBIOS_LOG("custom B%02x %s(0x%x, ) addr=%08x ra=%08x\n", call, biosB0n[call], a0, entry, ra); @@ -4138,7 +4149,8 @@ static void hleC0() { u32 call = t1 & 0xff; u32 entry = loadRam32(A_C0_TABLE + call * 4); - if (call < 128 && entry != A_C0_DUMMY) { + use_cycles(4+7); + if (call < 128 && entry != A_C0_TRAPS + call * 4) { PSXBIOS_LOG("custom C%02x %s(0x%x, ) addr=%08x ra=%08x\n", call, biosC0n[call], a0, entry, ra); softCall(entry); @@ -4152,6 +4164,47 @@ static void hleC0() { psxBranchTest(); } +static void hleA0t() { + u32 call = (pc0 - A_A0_TRAPS) / 4 - 1; + if (call >= 256u || !biosA0[call]) { + log_unhandled("unexpected A trap @%08x ra=%08x\n", pc0 - 4, ra); + mips_return_void_c(1000); + } + else + biosA0[call](); + + //printf("A(%02x) -> %x\n", call, v0); + psxBranchTest(); +} + +static void hleB0t() { + u32 call = (pc0 - A_B0_TRAPS) / 4 - 1; + if (pc0 - 4 == A_B0_5B_TRAP) + call = 0x5b; + if (call >= 256u || !biosB0[call]) { + log_unhandled("unexpected B trap @%08x ra=%08x\n", pc0 - 4, ra); + mips_return_void_c(1000); + } + else + biosB0[call](); + + //printf("B(%02x) -> %x\n", call, v0); + psxBranchTest(); +} + +static void hleC0t() { + u32 call = (pc0 - A_C0_TRAPS) / 4 - 1; + if (call >= 128u || !biosC0[call]) { + log_unhandled("unexpected C trap @%08x ra=%08x\n", pc0 - 4, ra); + mips_return_void_c(1000); + } + else + biosC0[call](); + + //printf("C(%02x) -> %x\n", call, v0); + psxBranchTest(); +} + // currently not used static void hleBootstrap() { CheckCdrom(); @@ -4173,7 +4226,7 @@ static void hleExecRet() { psxRegs.pc = ra; } -void (* const psxHLEt[24])() = { +void (* const psxHLEt[hleop_count_])() = { hleDummy, hleA0, hleB0, hleC0, hleBootstrap, hleExecRet, psxBiosException, hleDummy, hleExc0_0_1, hleExc0_0_2, @@ -4184,6 +4237,7 @@ void (* const psxHLEt[24])() = { hleExc1_3_1, hleExc1_3_2, hleExc3_0_2_defint, hleExcPadCard1, hleExcPadCard2, + hleA0t, hleB0t, hleC0t, }; void psxBiosCheckExe(u32 t_addr, u32 t_size, int loading_state) diff --git a/libpcsxcore/psxhle.h b/libpcsxcore/psxhle.h index e6d2df81..a94d694f 100644 --- a/libpcsxcore/psxhle.h +++ b/libpcsxcore/psxhle.h @@ -39,9 +39,11 @@ enum hle_op { hleop_exc1_3_1, hleop_exc1_3_2, hleop_exc3_0_2, hleop_exc_padcard1, hleop_exc_padcard2, + hleop_a0t, hleop_b0t, hleop_c0t, + hleop_count_ // must be last }; -extern void (* const psxHLEt[24])(); +extern void (* const psxHLEt[hleop_count_])(); #ifdef __cplusplus } -- 2.39.2