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comparison zruntime.S @ 284:ed7098f717d7

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Implement IN and OUT (untested)
author Mike Pavone <pavone@retrodev.com>
date Sat, 04 May 2013 15:58:15 -0700
parents 44f0bbf57b4f
children 021aeb6df19b
comparison
equal deleted inserted replaced
283:61f5d88ea01a 284:ed7098f717d7
1 z_inccycles_io:
2 cmp %edi, %ebp
3 jnb do_limit
4 no_sync_io:
5 add $4, %ebp
6 ret
7 do_limit_io:
8 cmp 112(%rsi), %ebp
9 jb no_sync_io
10 jmp sync_io
11
1 z_inccycles: 12 z_inccycles:
2 cmp %edi, %ebp 13 cmp %edi, %ebp
3 jnb do_limit 14 jnb do_limit
4 no_sync: 15 no_sync:
5 add $3, %ebp 16 add $3, %ebp
6 ret 17 ret
7 do_limit: 18 do_limit:
8 cmp 112(%rsi), %ebp 19 cmp 112(%rsi), %ebp
9 jb no_sync 20 jb no_sync
21 sync_io:
10 call z80_save_context_scratch 22 call z80_save_context_scratch
11 pop %rax /*return address in read/write func*/ 23 pop %rax /*return address in read/write func*/
12 pop 104(%rsi) /*return address in native code*/ 24 pop 104(%rsi) /*return address in native code*/
13 sub $5, %rax /* adjust return addres to point to the call instruction that got us here */ 25 sub $5, %rax /* adjust return addres to point to the call instruction that got us here */
14 mov %rax, (%rsi) 26 mov %rax, (%rsi)
177 pop %r14 189 pop %r14
178 add $1, %r14w 190 add $1, %r14w
179 shr $8, %r13w 191 shr $8, %r13w
180 call z_inccycles 192 call z_inccycles
181 call z80_write_byte_noinc 193 call z80_write_byte_noinc
194 ret
195
196 .global z80_io_read
197 z80_io_read:
198 call z_inccycles_io
199 /* genesis Z80 has no IO port hardware and always returns FF */
200 mov $0xFF, %r13
201 ret
202
203 .global z80_io_write
204 z80_io_write:
205 call z_inccycles_io
206 /* genesis Z80 has no IO port hardware and writes have no effect */
182 ret 207 ret
183 208
184 .global z80_retrans_stub 209 .global z80_retrans_stub
185 z80_retrans_stub: 210 z80_retrans_stub:
186 call z80_save_context 211 call z80_save_context