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UserspaceEmulator: Add an initial stack and implement PUSH/POP reg32

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Programs now start out with a 64 KB stack at 0x10000000. :^)
This commit is contained in:
Andreas Kling 2020-07-09 16:20:08 +02:00
parent d5c46cf528
commit d10765bec3
3 changed files with 99 additions and 5 deletions
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42
DevTools/UserspaceEmulator/SoftCPU.cpp
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@ -51,6 +51,34 @@ void SoftCPU::dump() const
printf("o=%u s=%u z=%u a=%u p=%u c=%u\n", m_of, m_sf, m_zf, m_af, m_pf, m_cf);
}
u32 SoftCPU::read_memory32(X86::LogicalAddress address)
{
ASSERT(address.selector() == 0x20);
auto value = m_emulator.mmu().read32(address.offset());
printf("\033[36;1mread_memory32: @%08x -> %08x\033[0m\n", address.offset(), value);
return value;
}
void SoftCPU::write_memory32(X86::LogicalAddress address, u32 value)
{
ASSERT(address.selector() == 0x20);
printf("\033[35;1mwrite_memory32: @%08x <- %08x\033[0m\n", address.offset(), value);
m_emulator.mmu().write32(address.offset(), value);
}
void SoftCPU::push32(u32 value)
{
m_esp -= sizeof(value);
write_memory32({ get_ss(), get_esp() }, value);
}
u32 SoftCPU::pop32()
{
auto value = read_memory32({ get_ss(), get_esp() });
m_esp += sizeof(value);
return value;
}
void SoftCPU::AAA(const X86::Instruction&) { TODO(); }
void SoftCPU::AAD(const X86::Instruction&) { TODO(); }
void SoftCPU::AAM(const X86::Instruction&) { TODO(); }
@ -346,7 +374,12 @@ void SoftCPU::POP_RM16(const X86::Instruction&) { TODO(); }
void SoftCPU::POP_RM32(const X86::Instruction&) { TODO(); }
void SoftCPU::POP_SS(const X86::Instruction&) { TODO(); }
void SoftCPU::POP_reg16(const X86::Instruction&) { TODO(); }
void SoftCPU::POP_reg32(const X86::Instruction&) { TODO(); }
void SoftCPU::POP_reg32(const X86::Instruction& insn)
{
*m_reg32_table[insn.register_index()] = pop32();
}
void SoftCPU::PUSHA(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSHAD(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSHF(const X86::Instruction&) { TODO(); }
@ -364,7 +397,12 @@ void SoftCPU::PUSH_imm16(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSH_imm32(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSH_imm8(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSH_reg16(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSH_reg32(const X86::Instruction&) { TODO(); }
void SoftCPU::PUSH_reg32(const X86::Instruction& insn)
{
push32(*m_reg32_table[insn.register_index()]);
}
void SoftCPU::RCL_RM16_1(const X86::Instruction&) { TODO(); }
void SoftCPU::RCL_RM16_CL(const X86::Instruction&) { TODO(); }
void SoftCPU::RCL_RM16_imm8(const X86::Instruction&) { TODO(); }