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LibX86+UserspaceEmulator: Introduce AddressSize and OperandSize enums

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These replace the bools a32 and o32, which will make implementing
64-bit sizes possible. :^)
This commit is contained in:
Simon Wanner 2022-03-24 23:01:11 +01:00 • committed by Andreas Kling
parent 7cd43deb28
commit a7268c3c74
6 changed files with 276 additions and 152 deletions
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57
Userland/DevTools/UserspaceEmulator/SoftCPU.h
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@ -175,64 +175,83 @@ public:
return gpr32((X86::RegisterIndex32)register_index);
}
ValueWithShadow<u32> source_index(bool a32) const
ValueWithShadow<u32> source_index(X86::AddressSize address_size) const
{
if (a32)
if (address_size == X86::AddressSize::Size32)
return esi();
return { si().value(), (u32)si().shadow_as_value() & 0xffff };
if (address_size == X86::AddressSize::Size16)
return { si().value(), (u32)si().shadow_as_value() & 0xffff };
VERIFY_NOT_REACHED();
}
ValueWithShadow<u32> destination_index(bool a32) const
ValueWithShadow<u32> destination_index(X86::AddressSize address_size) const
{
if (a32)
if (address_size == X86::AddressSize::Size32)
return edi();
return { di().value(), (u32)di().shadow_as_value() & 0xffff };
if (address_size == X86::AddressSize::Size16)
return { di().value(), (u32)di().shadow_as_value() & 0xffff };
VERIFY_NOT_REACHED();
}
ValueWithShadow<u32> loop_index(bool a32) const
ValueWithShadow<u32> loop_index(X86::AddressSize address_size) const
{
if (a32)
if (address_size == X86::AddressSize::Size32)
return ecx();
return { cx().value(), (u32)cx().shadow_as_value() & 0xffff };
if (address_size == X86::AddressSize::Size16)
return { cx().value(), (u32)cx().shadow_as_value() & 0xffff };
VERIFY_NOT_REACHED();
}
bool decrement_loop_index(bool a32)
bool decrement_loop_index(X86::AddressSize address_size)
{
if (a32) {
switch (address_size) {
case X86::AddressSize::Size32:
set_ecx({ ecx().value() - 1, ecx().shadow() });
return ecx().value() == 0;
case X86::AddressSize::Size16:
set_cx(ValueWithShadow<u16>(cx().value() - 1, cx().shadow()));
return cx().value() == 0;
}
set_cx(ValueWithShadow<u16>(cx().value() - 1, cx().shadow()));
return cx().value() == 0;
VERIFY_NOT_REACHED();
}
ALWAYS_INLINE void step_source_index(bool a32, u32 step)
ALWAYS_INLINE void step_source_index(X86::AddressSize address_size, u32 step)
{
if (a32) {
switch (address_size) {
case X86::AddressSize::Size32:
if (df())
set_esi({ esi().value() - step, esi().shadow() });
else
set_esi({ esi().value() + step, esi().shadow() });
} else {
break;
case X86::AddressSize::Size16:
if (df())
set_si(ValueWithShadow<u16>(si().value() - step, si().shadow()));
else
set_si(ValueWithShadow<u16>(si().value() + step, si().shadow()));
break;
default:
VERIFY_NOT_REACHED();
}
}
ALWAYS_INLINE void step_destination_index(bool a32, u32 step)
ALWAYS_INLINE void step_destination_index(X86::AddressSize address_size, u32 step)
{
if (a32) {
switch (address_size) {
case X86::AddressSize::Size32:
if (df())
set_edi({ edi().value() - step, edi().shadow() });
else
set_edi({ edi().value() + step, edi().shadow() });
} else {
break;
case X86::AddressSize::Size16:
if (df())
set_di(ValueWithShadow<u16>(di().value() - step, di().shadow()));
else
set_di(ValueWithShadow<u16>(di().value() + step, di().shadow()));
break;
default:
VERIFY_NOT_REACHED();
}
}