Function readFromContext

source/kernel/kthread.cpp:1005–1045

void common_fxrstor(CPU* cpu, U32 address);
void readFromContext(CPU* cpu, U32 context) {
    KMemory* memory = (KMemory*)cpu->memory;

    cpu->setSegment(GS, memory->readd(context+0x14));
    cpu->setSegment(FS, memory->readd(context+0x18));
    cpu->setSegment(ES, memory->readd(context+0x1C));
    cpu->setSegment(DS, memory->readd(context+0x20));

    cpu->reg[7].u32 = memory->readd(context+0x24); // EDI
    cpu->reg[6].u32 = memory->readd(context+0x28); // ESI
    cpu->reg[5].u32 = memory->readd(context+0x2C); // EBP
    cpu->reg[4].u32 = memory->readd(context+0x30); // ESP

    cpu->reg[3].u32 = memory->readd(context+0x34); // EBX
    cpu->reg[2].u32 = memory->readd(context+0x38); // EDX
    cpu->reg[1].u32 = memory->readd(context+0x3C); // ECX
    cpu->reg[0].u32 = memory->readd(context+0x40); // EAX
    
    cpu->eip.u32 = memory->readd(context+0x4C);
    cpu->setSegment(CS, memory->readd(context+0x50));
    cpu->flags = memory->readd(context+0x54);
    cpu->setSegment(SS, memory->readd(context+0x5C));

    /* common_fxrstor will handle this
    cpu->fpu.SetCW(memory->readd(context + 0x70));
    cpu->fpu.SetSW(memory->readd(context + 0x74));
    cpu->fpu.SetTag(memory->readd(context + 0x78));
    cpu->fpu.isMMXInUse = (memory->readw(context + 0xDE) & 0x8000) != 0;
    for (U32 i = 0; i < 8; i++) {
        U32 address = context + 0x8C + i * 10;

        if (cpu->fpu.isMMXInUse) {
            cpu->reg_mmx[i].q = cpu->memory->readq(address);
        } else {
            U32 index = (i - cpu->fpu.GetTop()) & 7;
            cpu->fpu.regs[i].d = cpu->fpu.FLD80(cpu->memory->readq(address), (S16)cpu->memory->readw(address+8));
        }
    }
    */
    common_fxrstor(cpu, context + 0xE0);
}

U32 KThread::sigreturn() {
    kpanic("KThread::sigreturn This code seems wrong, we never did a memcpy to memory of CPU, should this be readContext.  Debug this after finding a program that triggers it");