From 68eb34ef8b43287bd29b1d7074536189c56e2e32 Mon Sep 17 00:00:00 2001 From: notaz Date: Wed, 25 Apr 2007 20:34:01 +0000 Subject: [PATCH] Master blaster fix git-svn-id: file:///home/notaz/opt/svn/fceu@111 be3aeb3a-fb24-0410-a615-afba39da0efa --- ncpu.S | 33 ++++++++++++++++++++------------- 1 file changed, 20 insertions(+), 13 deletions(-) diff --git a/ncpu.S b/ncpu.S index d649f9a..0b79afb 100644 --- a/ncpu.S +++ b/ncpu.S @@ -264,18 +264,7 @@ bbbb: strb r0, [REG_ADDR] .endm -.macro READ_WRITE_3 - .long read_rom_byte - .long read_rom_byte - .long read_rom_byte - .long read_rom_byte - .long read_save_ram - .long read_high_reg - .long read_ppu_reg -9999: -.endm - -.macro READ_WRITE_4 +.macro READ_WRITE_W adr lr, 1f ldr pc, [pc, r3, lsl #2] nop @@ -290,6 +279,22 @@ bbbb: 1: .endm +.macro READ_WRITE_3 + .long read_rom_byte + .long read_rom_byte + .long read_rom_byte + .long read_rom_byte + .long read_save_ram + .long read_high_reg + .long read_ppu_reg +9999: + READ_WRITE_W @ rmw first writes unmodified data +.endm + +.macro READ_WRITE_4 + READ_WRITE_W @ and only then modified (Blaster Master) +.endm + @@@ @@@ ½ñ¤­¹þ¤ß¤À¤±¤Î¾ì¹ç @@@ @@ -2877,12 +2882,13 @@ write_high_reg: write_save_ram: write_rom_byte: #ifndef DEBUG_ASM_6502 - @ must preserve r3 for the callers too + @ must preserve r0 (data) and r3 for the callers str REG_PC, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x0c)] @ might get rebased str REG_P_REST, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x10)] @ might set irq str REG_CYCLE, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x1c)] @ might get used mov REG_PC, lr @ r7 mov REG_P_REST, r3 @ r8 + mov REG_CYCLE, r0 @ r11 ldr r2, =BWrite mov r1, r0 @@ -2893,6 +2899,7 @@ write_rom_byte: ldr REG_OP_TABLE, =cpu_exec_table @ got trashed because was in r12 mov lr, REG_PC mov r3, REG_P_REST + mov r0, REG_CYCLE ldr REG_PC, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x0c)] @ might get rebased ldr REG_P_REST, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x10)] @ might set irq ldr REG_CYCLE, [REG_OP_TABLE, #(OTOFFS_NES_REGS + 0x1c)] @ might get used -- 2.39.5