RaySollium99/picodrive
1
0
Fork 0
mirror of https://github.com/RaySollium99/picodrive.git synced 2025-09-05 07:17:45 -04:00
Code Issues Projects Releases Packages Wiki Activity Actions

drZ80 separation finished, related bugs fixed

Browse source 
git-svn-id: file:///home/notaz/opt/svn/PicoDrive@755 be3aeb3a-fb24-0410-a615-afba39da0efa
This commit is contained in:
notaz 2009-08-15 18:54:59 +00:00
parent ee05564fc7
commit d8f51995c4
5 changed files with 55 additions and 61 deletions
Download patch file Download diff file Expand all files Collapse all files

110
cpu/DrZ80/drz80.s
View file

@ -14,12 +14,12 @@
.equiv INTERRUPT_MODE, 0 ;@0 = Use internal int handler, 1 = Use Mames int handler
.equiv FAST_Z80SP, 1 ;@0 = Use mem functions for stack pointer, 1 = Use direct mem pointer
.equiv UPDATE_CONTEXT, 0
.equiv DRZ80_FOR_PICODRIVE, 1
.equiv DRZ80_XMAP, 1
.equiv DRZ80_XMAP_MORE_INLINE, 1
.if DRZ80_XMAP
.equ Z80_MEM_SHIFT, 13
;@ note: stack is locked in single bank that z80sp_base points to
.endif
.if INTERRUPT_MODE
@ -160,14 +160,14 @@ z80_xmap_read16: @ addr
0:
@ z80_xmap_read8 will save r3 and r12 for us
stmfd sp!,{r4,r5,lr}
mov r4,r0
stmfd sp!,{r8,r9,lr}
mov r8,r0
bl z80_xmap_read8
mov r5,r0
add r0,r4,#1
mov r9,r0
add r0,r8,#1
bl z80_xmap_read8
orr r0,r5,r0,lsl #8
ldmfd sp!,{r4,r5,pc}
orr r0,r9,r0,lsl #8
ldmfd sp!,{r8,r9,pc}
z80_xmap_write16: @ data, addr
add r2,r1,#1
@ -187,14 +187,30 @@ z80_xmap_write16: @ data, addr
bx lr
0:
stmfd sp!,{r4,r5,lr}
mov r4,r0
mov r5,r1
stmfd sp!,{r8,r9,lr}
mov r8,r0
mov r9,r1
bl z80_xmap_write8
mov r0,r4,lsr #8
add r1,r5,#1
mov r0,r8,lsr #8
add r1,r9,#1
bl z80_xmap_write8
ldmfd sp!,{r4,r5,pc}
ldmfd sp!,{r8,r9,pc}
z80_xmap_rebase_pc:
ldr r1,[cpucontext,#z80_read8]
mov r2,r0,lsr #Z80_MEM_SHIFT
ldr r1,[r1,r2,lsl #2]
movs r1,r1,lsl #1
strcc r1,[cpucontext,#z80pc_base]
addcc z80pc,r1,r0
bxcc lr
z80_bad_jump:
ldr r0,[cpucontext,#z80_read8]
ldr r0,[r0]
str r0,[cpucontext,#z80pc_base]
mov z80pc,r0
bx lr
.endif
@ -335,10 +351,8 @@ z80_xmap_write16: @ data, addr
.if UPDATE_CONTEXT
str z80pc,[cpucontext,#z80pc_pointer]
.endif
.if DRZ80_FOR_PICODRIVE
ldr r1,[cpucontext,#z80pc_base]
bic r0,r0,#0xfe000
add z80pc,r1,r0
.if DRZ80_XMAP
bl z80_xmap_rebase_pc
.else
stmfd sp!,{r3,r12}
mov lr,pc
@ -352,9 +366,10 @@ z80_xmap_write16: @ data, addr
.if UPDATE_CONTEXT
str z80pc,[cpucontext,#z80pc_pointer]
.endif
.if DRZ80_FOR_PICODRIVE
bic r0,r0,#0xfe000
.if DRZ80_XMAP
;@ XXX: SP is locked to single back z80sp_base points to.
ldr r1,[cpucontext,#z80sp_base]
bic r0,r0,#0x7f<<Z80_MEM_SHIFT
add r0,r1,r0
.else
stmfd sp!,{r3,r12}
@ -722,22 +737,9 @@ z80_xmap_write16: @ data, addr
.macro opPOP
.if FAST_Z80SP
.if DRZ80_FOR_PICODRIVE
@ notaz: try to protect against stack overflows, which tend to happen in Picodrive because of poor timing
ldr r2,[cpucontext,#z80sp_base]
ldrb r0,[z80sp],#1
add r2,r2,#0x2000
cmp z80sp,r2
@ subge z80sp,z80sp,#0x2000 @ unstable?
ldrb r1,[z80sp],#1
cmp z80sp,r2
@ subge z80sp,z80sp,#0x2000
orr r0,r0,r1, lsl #8
.else
ldrb r0,[z80sp],#1
ldrb r1,[z80sp],#1
orr r0,r0,r1, lsl #8
.endif
.else
mov r0,z80sp
readmem16
@ -752,23 +754,22 @@ z80_xmap_write16: @ data, addr
.endm
;@---------------------------------------
.macro stack_check
@ try to protect against stack overflows, lock into current bank
ldr r1,[cpucontext,#z80sp_base]
sub r1,z80sp,r1
cmp r1,#2
addlt z80sp,z80sp,#1<<Z80_MEM_SHIFT
.endm
.macro opPUSHareg reg @ reg > r1
.if FAST_Z80SP
.if DRZ80_FOR_PICODRIVE
@ notaz: try to protect against stack overflows, which tend to happen in Picodrive because of poor timing
ldr r0,[cpucontext,#z80sp_base]
cmp z80sp,r0
addle z80sp,z80sp,#0x2000
mov r1,\reg, lsr #8
strb r1,[z80sp,#-1]!
cmp z80sp,r0
addle z80sp,z80sp,#0x2000
strb \reg,[z80sp,#-1]!
.else
.if DRZ80_XMAP
stack_check
.endif
mov r1,\reg, lsr #8
strb r1,[z80sp,#-1]!
strb \reg,[z80sp,#-1]!
.endif
.else
mov r0,\reg
sub z80sp,z80sp,#2
@ -779,22 +780,13 @@ z80_xmap_write16: @ data, addr
.macro opPUSHreg reg
.if FAST_Z80SP
.if DRZ80_FOR_PICODRIVE
ldr r0,[cpucontext,#z80sp_base]
cmp z80sp,r0
addle z80sp,z80sp,#0x2000
mov r1,\reg, lsr #24
strb r1,[z80sp,#-1]!
cmp z80sp,r0
addle z80sp,z80sp,#0x2000
mov r1,\reg, lsr #16
strb r1,[z80sp,#-1]!
.else
mov r1,\reg, lsr #24
strb r1,[z80sp,#-1]!
mov r1,\reg, lsr #16
strb r1,[z80sp,#-1]!
.if DRZ80_XMAP
stack_check
.endif
mov r1,\reg, lsr #24
strb r1,[z80sp,#-1]!
mov r1,\reg, lsr #16
strb r1,[z80sp,#-1]!
.else
mov r0,\reg,lsr #16
sub z80sp,z80sp,#2

1
pico/cd/memory.c
View file

@ -1711,6 +1711,7 @@ PICO_INTERNAL void PicoMemSetupCD(void)
#ifdef EMU_M68K
m68k_mem_setup_cd();
#endif
z80_mem_setup();
// m68k_poll_addr = m68k_poll_cnt = 0;
s68k_poll_adclk = s68k_poll_cnt = 0;

3
pico/memory.c
View file

@ -514,7 +514,6 @@ PICO_INTERNAL void PicoMemResetHooks(void)
PicoWrite16Hook = OtherWrite16End;
}
static void z80_mem_setup(void);
#ifdef EMU_M68K
static void m68k_mem_setup(void);
#endif
@ -1066,7 +1065,7 @@ static void z80_md_out(unsigned short p, unsigned char d)
elprintf(EL_ANOMALY, "Z80 port %04x write %02x", p, d);
}
static void z80_mem_setup(void)
void z80_mem_setup(void)
{
z80_map_set(z80_read_map, 0x0000, 0x1fff, Pico.zram, 0);
z80_map_set(z80_read_map, 0x2000, 0x3fff, Pico.zram, 0);

1
pico/pico_int.h
View file

@ -427,6 +427,7 @@ PICO_INTERNAL_ASM void PicoMemReset(void);
PICO_INTERNAL void PicoMemResetHooks(void);
PICO_INTERNAL int PadRead(int i);
PICO_INTERNAL int ym2612_write_local(unsigned int a, unsigned int d, int is_from_z80);
void z80_mem_setup(void);
extern unsigned int (*PicoRead16Hook)(unsigned int a, int realsize);
extern void (*PicoWrite8Hook) (unsigned int a,unsigned int d,int realsize);
extern void (*PicoWrite16Hook)(unsigned int a,unsigned int d,int realsize);

1
pico/z80if.c
View file

@ -118,6 +118,7 @@ PICO_INTERNAL void z80_reset(void)
drZ80.Z80IM = 0; // 1?
drZ80.z80irqvector = 0xff0000; // RST 38h
drZ80.Z80PC_BASE = drZ80.Z80PC = z80_read_map[0] << 1;
// drZ80 is locked in single bank
drZ80.Z80SP_BASE = z80_read_map[0] << 1;
// drZ80.Z80SP = drZ80.z80_rebaseSP(0x2000); // 0xf000 ?
#endif