code: 9ferno

ref: 600bbfe4aaa9ad0f73d8d73eef1b7670e5f7d3a3
dir: /OpenBSD/amd64/include/emu.h/

View raw version 
/*
 * system- and machine-specific declarations for emu:
 * floating-point save and restore, signal handling primitive, and
 * implementation of the current-process variable `up'.
 */

/*
 * This structure must agree with FPsave and FPrestore asm routines
 */
typedef struct FPU FPU;
struct FPU
{
	uchar	env[28];
};

#define KSTACK (64 * 1024)

#ifndef USE_PTHREADS
static __inline Proc *getup(void) {
	Proc *p;
	print("getup asm code called\n");
	__asm__(	"movq	%%rsp, %%rax\n\t"
			: "=a" (p)
	);
	return *(Proc **)((uintptr)p & ~(KSTACK - 1));
};
#else
extern	Proc*	getup(void);
#endif

#define	up	(getup())

typedef sigjmp_buf osjmpbuf;
#define	ossetjmp(buf)	sigsetjmp(buf, 1)