diff options
Diffstat (limited to 'runtime.S')
| -rw-r--r-- | runtime.S | 48 |
1 files changed, 33 insertions, 15 deletions
@@ -123,21 +123,39 @@ do_vdp_port_read: do_io_write: call m68k_save_context - and $0xFF, %edi - mov %rcx, %rdx + and $0x3FF, %edi + mov %ecx, %edx call io_write mov %rax, %rsi call m68k_load_context ret do_io_read: mov %ecx, %edi - and $0xFF, %edi + and $0x3FF, %edi call m68k_save_context call io_read mov %rax, %rsi call m68k_load_context mov 136(%rsi), %cl ret + +do_io_write_w: + call m68k_save_context + and $0x3FF, %edi + mov %ecx, %edx + call io_write_w + mov %rax, %rsi + call m68k_load_context + ret +do_io_read_w: + mov %ecx, %edi + and $0x3FF, %edi + call m68k_save_context + call io_read_w + mov %rax, %rsi + call m68k_load_context + mov 136(%rsi), %cl + ret bad_access_msg: .asciz "Program tried to access illegal 68K address %X\n" @@ -208,8 +226,6 @@ crash: m68k_write_byte: call inccycles and $0xFFFFFF, %rdi - /* deal with byte swapping */ - xor $1, %edi cmp $0x400000, %edi jle cart_wb cmp $0xE00000, %edi @@ -218,16 +234,20 @@ m68k_write_byte: jge vdp_psg_wb cmp $0xA10000, %edi jl not_io_wb - cmp $0xA10100, %edi + cmp $0xA10300, %edi jge not_io_wb jmp do_io_write not_io_wb: ret workram_wb: + /* deal with byte swapping */ + xor $1, %edi and $0xFFFF, %rdi mov %cl, (%r9, %rdi) ret cart_wb: + /* deal with byte swapping */ + xor $1, %edi mov %cl, (%r8, %rdi) ret vdp_psg_wb: @@ -285,13 +305,9 @@ m68k_read_word_scratch1: jge vdp_psg cmp $0xA10000, %ecx jl not_io - cmp $0xA10100, %ecx + cmp $0xA10300, %ecx jge not_io - call do_io_read - mov %cl, %dil - and $0xFF, %cx - shl $8, %di - or %di, %cx + call do_io_read_w ret not_io: xor %cx, %cx @@ -327,15 +343,13 @@ m68k_read_long_scratch1: m68k_read_byte_scratch1: call inccycles and $0xFFFFFF, %rcx - /* deal with byte swapping */ - xor $1, %ecx cmp $0x400000, %ecx jle cart_b cmp $0xE00000, %ecx jge workram_b cmp $0xA10000, %ecx jl not_io_b - cmp $0xA10100, %ecx + cmp $0xA10300, %ecx jge not_io_b jmp do_io_read not_io_b: @@ -343,10 +357,14 @@ not_io_b: dec %cl ret workram_b: + /* deal with byte swapping */ + xor $1, %ecx and $0xFFFF, %rcx mov (%r9, %rcx), %cl ret cart_b: + /* deal with byte swapping */ + xor $1, %ecx mov (%r8, %rcx), %cl ret |