xref: /src/sys/arch/powerpc/include/reg.h

/*	$NetBSD: reg.h,v 1.7 2002/04/18 20:08:10 matt Exp $	*/

#ifndef _POWERPC_REG_H_
#define _POWERPC_REG_H_

/*
 *  Register Usage according the SVR4 ABI for PPC.
 *
 *  Register Name	Usage
 *  r0			Volatile register which may be modified during
 *			function linkage
 *  r1			Stack fram pointer, always valid
 *  r2			System-reserved register
 *  r3-r4		Volatile registers used for parameter passing and
 *			return values
 *  r5-r10		Volatile registers used for parameter passing
 *  r11-r12		Volatile register which may be modified during
 *			function linkage
 *  [Start of callee-saved registers]
 *  r13			Small data area pointer register
 *  r14-r30		Registers used for local variables
 *  r31			Used for local variable or "environent pointers"
 *
 *  f0			Volatile register
 *  f1			Volatile registers used for parameter passing and
 *			return values
 *  f2-f8		Volatile registers used for parameter passing
 *  f9-f13		Volatile registers
 *  f14-f31		Registers used for local variables
 */

struct reg {				/* base registers */
	register_t fixreg[32];
	register_t lr;			/* Link Register */
	int cr;				/* Condition Register */
	int xer;			/* SPR 1 */
	register_t ctr;			/* Count Register */
	register_t pc;			/* Program Counter */
};

struct fpreg {				/* Floating Point registers */
	double fpreg[32];
	double fpscr;			/* Status and Control Register */
};

struct vreg {				/* Vector registers */
	u_int32_t vreg[32][4];
	register_t vscr;		/* Vector Status And Control Register */
	register_t vrsave;		/* SPR 256 */
};

#endif /* _POWERPC_REG_H_ */