kvisc/vm/in/stack.c

// The OS/K Team licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

#include <in/instrs.h>

//
// Stack manipulation instructions
//

IMPL_START_1(push)
{
    CHK_STACK(<);
    PUSH(v1);
}
IMPL_END;

IMPL_START_1(pop)
{
    CHK_STACK(<=);
    POP(v1);
}
IMPL_OUT;

IMPL_START_1(call)
{
    CHK_STACK(<);
    PUSH(rip);
    JUMP(v1);
}
IMPL_END;

IMPL_START_0(ret)
{
    CHK_STACK(<=);
    POP(rip);
}
IMPL_END;

IMPL_START_0(enter)
{
    // We don't CHK_STACK(<) here because ENTER
    // (should) always be preceded by a CALL,
    // which already checks the stack

    PUSH(rbp);
    rbp = rsp;
    
    if (p1) {
        rsp -= p1->val * 8;
    }
}
IMPL_END;

IMPL_START_0(leave)
{
    // Do NOT check stack here
    // (it would always fail)
    rsp = rbp;
    POP(rbp);
}
IMPL_END;

IMPL_START_0(pushf)
{
    CHK_STACK(<);
    PUSH(flg);
}
IMPL_END;

IMPL_START_0(popf)
{
    CHK_STACK(<=);

    // XXX
    CHK_SUPERV();

    POP(flg);
}
IMPL_END;