#include <sys/ucontext.h>

namespace factor
{

/* Fault handler information.  MacOSX version.
Copyright (C) 1993-1999, 2002-2003  Bruno Haible <clisp.org at bruno>
Copyright (C) 2003  Paolo Bonzini <gnu.org at bonzini>

Used under BSD license with permission from Paolo Bonzini and Bruno Haible,
2005-03-10:

http://sourceforge.net/mailarchive/message.php?msg_name=200503102200.32002.bruno%40clisp.org

Modified for Factor by Slava Pestov */
#define MACH_EXC_STATE_TYPE i386_exception_state_t
#define MACH_EXC_STATE_FLAVOR i386_EXCEPTION_STATE
#define MACH_EXC_STATE_COUNT i386_EXCEPTION_STATE_COUNT

#define MACH_EXC_INTEGER_DIV EXC_I386_DIV

#define MACH_THREAD_STATE_TYPE i386_thread_state_t
#define MACH_THREAD_STATE_FLAVOR i386_THREAD_STATE
#define MACH_THREAD_STATE_COUNT i386_THREAD_STATE_COUNT

#define MACH_FLOAT_STATE_TYPE i386_float_state_t
#define MACH_FLOAT_STATE_FLAVOR i386_FLOAT_STATE
#define MACH_FLOAT_STATE_COUNT i386_FLOAT_STATE_COUNT

#if __DARWIN_UNIX03
	#define MACH_EXC_STATE_FAULT(exc_state) (exc_state)->__faultvaddr
	#define MACH_STACK_POINTER(thr_state) (thr_state)->__esp
	#define MACH_PROGRAM_COUNTER(thr_state) (thr_state)->__eip

	#define UAP_SS(ucontext) &(((ucontext_t *)(ucontext))->uc_mcontext->__ss)
	#define UAP_FS(ucontext) &(((ucontext_t *)(ucontext))->uc_mcontext->__fs)

	#define MXCSR(float_state) (float_state)->__fpu_mxcsr
	#define X87SW(float_state) (float_state)->__fpu_fsw
#else
	#define MACH_EXC_STATE_FAULT(exc_state) (exc_state)->faultvaddr
	#define MACH_STACK_POINTER(thr_state) (thr_state)->esp
	#define MACH_PROGRAM_COUNTER(thr_state) (thr_state)->eip

	#define UAP_SS(ucontext) &(((ucontext_t *)(ucontext))->uc_mcontext->ss)
	#define UAP_FS(ucontext) &(((ucontext_t *)(ucontext))->uc_mcontext->fs)

	#define MXCSR(float_state) (float_state)->fpu_mxcsr
	#define X87SW(float_state) (float_state)->fpu_fsw
#endif

#define UAP_PROGRAM_COUNTER(ucontext) \
	MACH_PROGRAM_COUNTER(UAP_SS(ucontext))

inline static unsigned int mach_fpu_status(i386_float_state_t *float_state)
{
	unsigned short x87sw;
	memcpy(&x87sw, &X87SW(float_state), sizeof(x87sw));
	return MXCSR(float_state) | x87sw;
}

inline static unsigned int uap_fpu_status(void *uap)
{
	return mach_fpu_status(UAP_FS(uap));
}

inline static void mach_clear_fpu_status(i386_float_state_t *float_state)
{
	MXCSR(float_state) &= 0xffffffc0;
	memset(&X87SW(float_state), 0, sizeof(X87SW(float_state)));
}

inline static void uap_clear_fpu_status(void *uap)
{
	mach_clear_fpu_status(UAP_FS(uap));
}

}