63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/*
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* \brief Constants definitions for the x86 architecture.
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* \author Stefan Kalkowski
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* \date 2011-09-08
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*/
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/*
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* Copyright (C) 2011-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__SPEC__X86__CPU__CONSTS_H_
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#define _INCLUDE__SPEC__X86__CPU__CONSTS_H_
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#include <base/stdint.h>
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namespace X86 {
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enum Eflags_masks {
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CARRY = 1 << 0,
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PARITY = 1 << 2,
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ADJUST = 1 << 4,
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ZERO = 1 << 6,
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SIGN = 1 << 7,
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TRAP = 1 << 8,
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INT_ENABLE = 1 << 9,
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DIRECTION = 1 << 10,
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OVERFLOW = 1 << 11,
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IOPL = 3 << 12,
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NESTED_TASK = 1 << 14,
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};
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}
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namespace Abi {
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/**
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* On x86, we align the stack top to 16 byte. As a call will result in
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* growth of the stack, we further adjust the stack-top address to comply
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* to the AMD64 ABI rule "stack top + adjustment is 16-byte aligned".
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*/
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inline Genode::addr_t stack_align(Genode::addr_t addr) {
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return (addr & ~0xf) - sizeof(Genode::addr_t); }
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/**
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* Do ABI specific initialization to a freshly created stack
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*
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* \param stack_top top of the stack
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*/
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inline void init_stack(Genode::addr_t const stack_top)
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{
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/*
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* The value at the top of the stack might get interpreted as return
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* address of the thread start function by GDB, so we set it to 0.
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*/
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*(Genode::addr_t *)stack_top = 0;
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}
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}
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#endif /* _INCLUDE__SPEC__X86__CPU__CONSTS_H_ */
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