Retro/pcem
Watch
1
0
Fork
You've already forked pcem
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

18
src/x86_ops_xchg.h
View file

@ -1,7 +1,10 @@
static int opXCHG_b_a16(uint32_t fetchdat)
{
uint8_t temp;
fetch_ea_16(fetchdat);
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
temp = geteab(); if (cpu_state.abrt) return 1;
seteab(getr8(cpu_reg)); if (cpu_state.abrt) return 1;
setr8(cpu_reg, temp);
@ -12,7 +15,10 @@ static int opXCHG_b_a16(uint32_t fetchdat)
static int opXCHG_b_a32(uint32_t fetchdat)
{
uint8_t temp;
fetch_ea_32(fetchdat);
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
temp = geteab(); if (cpu_state.abrt) return 1;
seteab(getr8(cpu_reg)); if (cpu_state.abrt) return 1;
setr8(cpu_reg, temp);
@ -24,7 +30,10 @@ static int opXCHG_b_a32(uint32_t fetchdat)
static int opXCHG_w_a16(uint32_t fetchdat)
{
uint16_t temp;
fetch_ea_16(fetchdat);
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
temp = geteaw(); if (cpu_state.abrt) return 1;
seteaw(cpu_state.regs[cpu_reg].w); if (cpu_state.abrt) return 1;
cpu_state.regs[cpu_reg].w = temp;
@ -35,7 +44,10 @@ static int opXCHG_w_a16(uint32_t fetchdat)
static int opXCHG_w_a32(uint32_t fetchdat)
{
uint16_t temp;
fetch_ea_32(fetchdat);
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
temp = geteaw(); if (cpu_state.abrt) return 1;
seteaw(cpu_state.regs[cpu_reg].w); if (cpu_state.abrt) return 1;
cpu_state.regs[cpu_reg].w = temp;
@ -47,7 +59,10 @@ static int opXCHG_w_a32(uint32_t fetchdat)
static int opXCHG_l_a16(uint32_t fetchdat)
{
uint32_t temp;
fetch_ea_16(fetchdat);
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
temp = geteal(); if (cpu_state.abrt) return 1;
seteal(cpu_state.regs[cpu_reg].l); if (cpu_state.abrt) return 1;
cpu_state.regs[cpu_reg].l = temp;
@ -58,7 +73,10 @@ static int opXCHG_l_a16(uint32_t fetchdat)
static int opXCHG_l_a32(uint32_t fetchdat)
{
uint32_t temp;
fetch_ea_32(fetchdat);
if (cpu_mod != 3)
SEG_CHECK_WRITE(cpu_state.ea_seg);
temp = geteal(); if (cpu_state.abrt) return 1;
seteal(cpu_state.regs[cpu_reg].l); if (cpu_state.abrt) return 1;
cpu_state.regs[cpu_reg].l = temp;