mirror of
https://github.com/genodelabs/genode.git
synced 2024-12-26 08:51:08 +00:00
63 lines
1.5 KiB
C++
63 lines
1.5 KiB
C++
/*
|
|
* \brief Constants definitions for the x86 architecture.
|
|
* \author Stefan Kalkowski
|
|
* \date 2011-09-08
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2011-2017 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU Affero General Public License version 3.
|
|
*/
|
|
|
|
#ifndef _INCLUDE__SPEC__X86__CPU__CONSTS_H_
|
|
#define _INCLUDE__SPEC__X86__CPU__CONSTS_H_
|
|
|
|
#include <base/stdint.h>
|
|
|
|
namespace X86 {
|
|
|
|
enum Eflags_masks {
|
|
CARRY = 1 << 0,
|
|
PARITY = 1 << 2,
|
|
ADJUST = 1 << 4,
|
|
ZERO = 1 << 6,
|
|
SIGN = 1 << 7,
|
|
TRAP = 1 << 8,
|
|
INT_ENABLE = 1 << 9,
|
|
DIRECTION = 1 << 10,
|
|
OVERFLOW = 1 << 11,
|
|
IOPL = 3 << 12,
|
|
NESTED_TASK = 1 << 14,
|
|
};
|
|
}
|
|
|
|
|
|
namespace Abi {
|
|
|
|
/**
|
|
* On x86, we align the stack top to 16 byte. As a call will result in
|
|
* growth of the stack, we further adjust the stack-top address to comply
|
|
* to the AMD64 ABI rule "stack top + adjustment is 16-byte aligned".
|
|
*/
|
|
inline Genode::addr_t stack_align(Genode::addr_t addr) {
|
|
return (addr & ~0xf) - sizeof(Genode::addr_t); }
|
|
|
|
/**
|
|
* Do ABI specific initialization to a freshly created stack
|
|
*
|
|
* \param stack_top top of the stack
|
|
*/
|
|
inline void init_stack(Genode::addr_t const stack_top)
|
|
{
|
|
/*
|
|
* The value at the top of the stack might get interpreted as return
|
|
* address of the thread start function by GDB, so we set it to 0.
|
|
*/
|
|
*(Genode::addr_t *)stack_top = 0;
|
|
}
|
|
}
|
|
|
|
#endif /* _INCLUDE__SPEC__X86__CPU__CONSTS_H_ */
|