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Perform NULL segment checks upfront in opcode handlers, rather than on every memory access.

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This removes the need to pass the segment to readmem*l()/writemem*l().
This commit is contained in:
SarahW 2018-07-18 22:10:18 +01:00
commit 0f0a1c3223
31 changed files with 976 additions and 325 deletions
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20
src/808x.c
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@ -38,13 +38,6 @@ int nopageerrors=0;
void FETCHCOMPLETE();
uint8_t readmembl(uint32_t addr);
void writemembl(uint32_t addr, uint8_t val);
uint16_t readmemwl(uint32_t seg, uint32_t addr);
void writememwl(uint32_t seg, uint32_t addr, uint16_t val);
uint32_t readmemll(uint32_t seg, uint32_t addr);
void writememll(uint32_t seg, uint32_t addr, uint32_t val);
#undef readmemb
#undef readmemw
uint8_t readmemb(uint32_t a)
@ -63,7 +56,7 @@ uint8_t readmembf(uint32_t a)
uint16_t readmemw(uint32_t s, uint16_t a)
{
if (a!=(cs+cpu_state.pc)) memcycs+=(8>>is8086);
if ((readlookup2[((s)+(a))>>12]==-1 || (s)==0xFFFFFFFF)) return readmemwl(s,a);
if ((readlookup2[((s)+(a))>>12]==-1 || (s)==0xFFFFFFFF)) return readmemwl(s+a);
else return *(uint16_t *)(readlookup2[(s + a) >> 12] + s + a);
}
@ -76,24 +69,21 @@ void refreshread() { /*pclog("Refreshread\n"); */FETCHCOMPLETE(); memcycs+=4; }
cpu_rm=rmdat&7; \
if (cpu_mod!=3) fetcheal(); }
void writemembl(uint32_t addr, uint8_t val);
void writememb(uint32_t a, uint8_t v)
{
memcycs+=4;
if (writelookup2[(a)>>12]==-1) writemembl(a,v);
else *(uint8_t *)(writelookup2[a >> 12] + a) = v;
}
void writememwl(uint32_t seg, uint32_t addr, uint16_t val);
void writememw(uint32_t s, uint32_t a, uint16_t v)
{
memcycs+=(8>>is8086);
if (writelookup2[((s)+(a))>>12]==-1 || (s)==0xFFFFFFFF) writememwl(s,a,v);
if (writelookup2[((s)+(a))>>12]==-1 || (s)==0xFFFFFFFF) writememwl(s+a,v);
else *(uint16_t *)(writelookup2[(s + a) >> 12] + s + a) = v;
}
void writememll(uint32_t seg, uint32_t addr, uint32_t val);
void writememl(uint32_t s, uint32_t a, uint32_t v)
{
if (writelookup2[((s)+(a))>>12]==-1 || (s)==0xFFFFFFFF) writememll(s,a,v);
if (writelookup2[((s)+(a))>>12]==-1 || (s)==0xFFFFFFFF) writememll(s+a,v);
else *(uint32_t *)(writelookup2[(s + a) >> 12] + s + a) = v;
}
@ -538,10 +528,10 @@ void dumpregs()
fclose(f);*/
pclog("Dumping rram4.dmp\n");
f=fopen("rram4.dmp","wb");
for (c=0;c<0x0050000;c++)
for (c=0;c<0x0050000;c++)
{
cpu_state.abrt = 0;
putc(readmemb386l(0,c+0x80000000),f);
putc(readmemb386l(c+0x80000000),f);
}
fclose(f);
pclog("Dumping done\n");