arch/ia64/kernel/minstate.h - pub/scm/linux/kernel/git/wtarreau/linux-2.4 - Git at Google

 #include <linux/config.h>

 #include "entry.h"

 /*
  * For ivt.s we want to access the stack virtually so we don't have to disable translation
  * on interrupts.
  *
  *  On entry:
  *	r1:	pointer to current task (ar.k6)
  */
 #define MINSTATE_START_SAVE_MIN_VIRT								\
 	dep r1=-1,r1,61,3;				/* r1 = current (virtual) */		\
 (pUser)	mov ar.rsc=0;		/* set enforced lazy mode, pl 0, little-endian, loadrs=0 */	\
 	;;											\
 (pUser)	addl r22=IA64_RBS_OFFSET,r1;			/* compute base of RBS */		\
 (pUser)	mov r24=ar.rnat;									\
 (pKern) mov r1=sp;					/* get sp  */				\
 	;;											\
 (pUser)	addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1;	/* compute base of memory stack */	\
 (pUser)	mov r23=ar.bspstore;				/* save ar.bspstore */			\
 	;;											\
 (pKern) addl r1=-IA64_PT_REGS_SIZE,r1;			/* if in kernel mode, use sp (r12) */	\
 (pUser)	mov ar.bspstore=r22;				/* switch to kernel RBS */		\
 	;;											\
 (pUser)	mov r18=ar.bsp;										\
 (pUser)	mov ar.rsc=0x3;		/* set eager mode, pl 0, little-endian, loadrs=0 */		\

 #define MINSTATE_END_SAVE_MIN_VIRT								\
 	or r13=r13,r14;		/* make `current' a kernel virtual address */			\
 	bsw.1;			/* switch back to bank 1 (must be last in insn group) */	\
 	;;

 /*
  * For mca_asm.S we want to access the stack physically since the state is saved before we
  * go virtual and don't want to destroy the iip or ipsr.
  */
 #define MINSTATE_START_SAVE_MIN_PHYS								\
 (pKern) movl sp=ia64_init_stack+IA64_STK_OFFSET-IA64_PT_REGS_SIZE;				\
 (pUser)	mov ar.rsc=0;		/* set enforced lazy mode, pl 0, little-endian, loadrs=0 */	\
 (pUser)	addl r22=IA64_RBS_OFFSET,r1;		/* compute base of register backing store */	\
 	;;											\
 (pUser)	mov r24=ar.rnat;									\
 (pKern) dep r1=0,sp,61,3;				/* compute physical addr of sp	*/	\
 (pUser)	addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1;	/* compute base of memory stack */	\
 (pUser)	mov r23=ar.bspstore;				/* save ar.bspstore */			\
 (pUser)	dep r22=-1,r22,61,3;				/* compute kernel virtual addr of RBS */\
 	;;											\
 (pKern) addl r1=-IA64_PT_REGS_SIZE,r1;		/* if in kernel mode, use sp (r12) */		\
 (pUser)	mov ar.bspstore=r22;			/* switch to kernel RBS */			\
 	;;											\
 (pUser)	mov r18=ar.bsp;										\
 (pUser)	mov ar.rsc=0x3;		/* set eager mode, pl 0, little-endian, loadrs=0 */		\

 #define MINSTATE_END_SAVE_MIN_PHYS								\
 	or r12=r12,r14;		/* make sp a kernel virtual address */				\
 	or r13=r13,r14;		/* make `current' a kernel virtual address */			\
 	;;

 #ifdef MINSTATE_VIRT
 # define MINSTATE_START_SAVE_MIN	MINSTATE_START_SAVE_MIN_VIRT
 # define MINSTATE_END_SAVE_MIN		MINSTATE_END_SAVE_MIN_VIRT
 #endif

 #ifdef MINSTATE_PHYS
 # define MINSTATE_START_SAVE_MIN	MINSTATE_START_SAVE_MIN_PHYS
 # define MINSTATE_END_SAVE_MIN		MINSTATE_END_SAVE_MIN_PHYS
 #endif

 /*
  * DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
  * the minimum state necessary that allows us to turn psr.ic back
  * on.
  *
  * Assumed state upon entry:
  *	psr.ic: off
  *	r31:	contains saved predicates (pr)
  *
  * Upon exit, the state is as follows:
  *	psr.ic: off
  *	 r2 = points to &pt_regs.r16
  *	 r8 = contents of ar.ccv
  *	 r9 = contents of ar.csd
  *	r10 = contents of ar.ssd
  *	r11 = FPSR_DEFAULT
  *	r12 = kernel sp (kernel virtual address)
  *	r13 = points to current task_struct (kernel virtual address)
  *	p15 = TRUE if psr.i is set in cr.ipsr
  *	predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
  *		preserved
  *
  * Note that psr.ic is NOT turned on by this macro.  This is so that
  * we can pass interruption state as arguments to a handler.
  */
 #define DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA)							\
 	mov r29=cr.ipsr;									\
 	mov r17=IA64_KR(CURRENT);		/* r1 = current (physical) */			\
 	mov r20=r1;										\
 	mov r27=ar.rsc;										\
 	mov r25=ar.unat;									\
 	mov r26=ar.pfs;										\
 	mov r21=ar.fpsr;									\
 	mov r28=cr.iip;										\
 	COVER;											\
 	;;											\
 	invala;											\
 	extr.u r16=r29,32,2;		/* extract psr.cpl */					\
 	;;											\
 	cmp.eq pKern,pUser=r0,r16;	/* are we in kernel mode already? (psr.cpl==0) */	\
 	mov r1=r17; 										\
 	/* switch from user to kernel RBS: */							\
 	;;											\
 	SAVE_IFS;										\
 	MINSTATE_START_SAVE_MIN									\
 	adds r17=2*L1_CACHE_BYTES,r1;		/* really: biggest cache-line size */		\
 	adds r16=PT(CR_IPSR),r1;								\
 	;;											\
 	lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES;						\
 	st8 [r16]=r29;		/* save cr.ipsr */						\
 	;;											\
 	lfetch.fault.excl.nt1 [r17];								\
 	;;											\
 	adds r16=PT(R8),r1;	/* initialize first base pointer */				\
 	adds r17=PT(R9),r1;	/* initialize second base pointer */				\
 	;;											\
 .mem.offset 0,0; st8.spill [r16]=r8,16;								\
 .mem.offset 8,0; st8.spill [r17]=r9,16;								\
 	;;											\
 .mem.offset 0,0; st8.spill [r16]=r10,24;							\
 .mem.offset 8,0; st8.spill [r17]=r11,32;							\
 	;;											\
 	st8 [r16]=r28,8;	/* save cr.iip */						\
 	mov r28=b0;          	/* rCRIIP=branch reg b0 */					\
 (pKern)	mov r18=r0;		/* make sure r18 isn't NaT */					\
 	mov r8=ar.ccv;                                                                          \
 	mov r9=ar.csd;                                                                          \
 	mov r10=ar.ssd;                                                                         \
 	movl r11=FPSR_DEFAULT;   /* L-unit */                                                   \
 	;;											\
 	st8 [r16]=r30,16;	/* save cr.ifs */						\
 	st8 [r17]=r25,16;	/* save ar.unat */						\
 (pUser)	sub r18=r18,r22;	/* r18=RSE.ndirty*8 */						\
 	;;											\
 	st8 [r16]=r26,16;	/* save ar.pfs */						\
 	st8 [r17]=r27,16;	/* save ar.rsc */						\
 	tbit.nz p15,p0=r29,IA64_PSR_I_BIT							\
 	;;			/* avoid RAW on r16 & r17 */					\
 (pKern)	adds r16=16,r16;	/* skip over ar_rnat field */					\
 (pKern)	adds r17=16,r17;	/* skip over ar_bspstore field */				\
 (pUser)	st8 [r16]=r24,16;	/* save ar.rnat */						\
 (pUser)	st8 [r17]=r23,16;	/* save ar.bspstore */					  	\
 	;;											\
 	st8 [r16]=r31,16;	/* save predicates */						\
 	st8 [r17]=r28,16;	/* save b0 */							\
 	shl r18=r18,16;		/* compute ar.rsc to be used for "loadrs" */			\
 	;;											\
 	st8 [r16]=r18,16;	/* save ar.rsc value for "loadrs" */				\
 	st8.spill [r17]=r20,16;	/* save original r1 */						\
 	;;											\
 .mem.offset 0,0; st8.spill [r16]=r12,16;							\
 .mem.offset 8,0; st8.spill [r17]=r13,16;							\
 	cmp.eq pNonSys,pSys=r0,r0	/* initialize pSys=0, pNonSys=1 */			\
 	;;											\
 .mem.offset 0,0; st8 [r16]=r21,PT(R14)-PT(AR_FPSR); 	/* ar.fpsr */				\
 .mem.offset 8,0; st8.spill [r17]=r15,PT(R3)-PT(R15);						\
 	adds r12=-16,r1;	/* switch to kernel memory stack (with 16 bytes of scratch) */	\
 	;;											\
 	mov r13=IA64_KR(CURRENT);	/* establish `current' */				\
 .mem.offset 0,0; st8.spill [r16]=r14,8;								\
 	dep r14=-1,r0,61,3;									\
 	;;											\
 .mem.offset 0,0; st8.spill [r16]=r2,16;								\
 .mem.offset 8,0; st8.spill [r17]=r3,16;								\
 	adds r2=IA64_PT_REGS_R16_OFFSET,r1;							\
 	;;											\
 	EXTRA;											\
 	movl r1=__gp;		/* establish kernel global pointer */				\
 	;;											\
 	MINSTATE_END_SAVE_MIN

 /*
  * SAVE_REST saves the remainder of pt_regs (with psr.ic on).
  *
  * Assumed state upon entry:
  *	psr.ic: on
  *	r2:	points to &pt_regs.r16
  *	r3:	points to &pt_regs.r17
  *	r8:	contents of ar.ccv
  *	r9:	contents of ar.csd
  *	r10:	contents of ar.ssd
  *	r11:	FPSR_DEFAULT
  *
  * Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
  */
 #define SAVE_REST				\
 .mem.offset 0,0; st8.spill [r2]=r16,16;		\
 .mem.offset 8,0; st8.spill [r3]=r17,16;		\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r18,16;		\
 .mem.offset 8,0; st8.spill [r3]=r19,16;		\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r20,16;		\
 .mem.offset 8,0; st8.spill [r3]=r21,16;		\
 	mov r18=b6;				\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r22,16;		\
 .mem.offset 8,0; st8.spill [r3]=r23,16;		\
 	mov r19=b7;				\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r24,16;		\
 .mem.offset 8,0; st8.spill [r3]=r25,16;		\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r26,16;		\
 .mem.offset 8,0; st8.spill [r3]=r27,16;		\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r28,16;		\
 .mem.offset 8,0; st8.spill [r3]=r29,16;		\
 	;;					\
 .mem.offset 0,0; st8.spill [r2]=r30,16;		\
 .mem.offset 8,0; st8.spill [r3]=r31,32;		\
 	;;					\
 	mov ar.fpsr=r11;	/* M-unit */	\
 	st8 [r2]=r8,8;		/* ar.ccv */	\
 	adds r24=PT(B6)-PT(F7),r3;		\
 	;;					\
 	stf.spill [r2]=f6,32;			\
 	stf.spill [r3]=f7,32;			\
 	;;					\
 	stf.spill [r2]=f8,32;			\
 	stf.spill [r3]=f9,32;			\
 	;;					\
 	stf.spill [r2]=f10;			\
 	stf.spill [r3]=f11;			\
 	adds r25=PT(B7)-PT(F11),r3;		\
 	;;					\
 	st8 [r24]=r18,16;	/* b6 */	\
 	st8 [r25]=r19,16;	/* b7 */	\
 	;;					\
 	st8 [r24]=r9;		/* ar.csd */	\
 	st8 [r25]=r10;		/* ar.ssd */	\
 	;;

 #define SAVE_MIN_WITH_COVER	DO_SAVE_MIN(cover, mov r30=cr.ifs,)
 #define SAVE_MIN_WITH_COVER_R19	DO_SAVE_MIN(cover, mov r30=cr.ifs, mov r15=r19)
 #define SAVE_MIN		DO_SAVE_MIN(     , mov r30=r0, )
	#include <linux/config.h>

	#include "entry.h"

	/*
	* For ivt.s we want to access the stack virtually so we don't have to disable translation
	* on interrupts.
	*
	* On entry:
	* r1: pointer to current task (ar.k6)
	*/
	#define MINSTATE_START_SAVE_MIN_VIRT \
	dep r1=-1,r1,61,3; /* r1 = current (virtual) */ \
	(pUser) mov ar.rsc=0; /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \
	;; \
	(pUser) addl r22=IA64_RBS_OFFSET,r1; /* compute base of RBS */ \
	(pUser) mov r24=ar.rnat; \
	(pKern) mov r1=sp; /* get sp */ \
	;; \
	(pUser) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1; /* compute base of memory stack */ \
	(pUser) mov r23=ar.bspstore; /* save ar.bspstore */ \
	;; \
	(pKern) addl r1=-IA64_PT_REGS_SIZE,r1; /* if in kernel mode, use sp (r12) */ \
	(pUser) mov ar.bspstore=r22; /* switch to kernel RBS */ \
	;; \
	(pUser) mov r18=ar.bsp; \
	(pUser) mov ar.rsc=0x3; /* set eager mode, pl 0, little-endian, loadrs=0 */ \

	#define MINSTATE_END_SAVE_MIN_VIRT \
	or r13=r13,r14; /* make `current' a kernel virtual address */ \
	bsw.1; /* switch back to bank 1 (must be last in insn group) */ \
	;;

	/*
	* For mca_asm.S we want to access the stack physically since the state is saved before we
	* go virtual and don't want to destroy the iip or ipsr.
	*/
	#define MINSTATE_START_SAVE_MIN_PHYS \
	(pKern) movl sp=ia64_init_stack+IA64_STK_OFFSET-IA64_PT_REGS_SIZE; \
	(pUser) mov ar.rsc=0; /* set enforced lazy mode, pl 0, little-endian, loadrs=0 */ \
	(pUser) addl r22=IA64_RBS_OFFSET,r1; /* compute base of register backing store */ \
	;; \
	(pUser) mov r24=ar.rnat; \
	(pKern) dep r1=0,sp,61,3; /* compute physical addr of sp */ \
	(pUser) addl r1=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r1; /* compute base of memory stack */ \
	(pUser) mov r23=ar.bspstore; /* save ar.bspstore */ \
	(pUser) dep r22=-1,r22,61,3; /* compute kernel virtual addr of RBS */\
	;; \
	(pKern) addl r1=-IA64_PT_REGS_SIZE,r1; /* if in kernel mode, use sp (r12) */ \
	(pUser) mov ar.bspstore=r22; /* switch to kernel RBS */ \
	;; \
	(pUser) mov r18=ar.bsp; \
	(pUser) mov ar.rsc=0x3; /* set eager mode, pl 0, little-endian, loadrs=0 */ \

	#define MINSTATE_END_SAVE_MIN_PHYS \
	or r12=r12,r14; /* make sp a kernel virtual address */ \
	or r13=r13,r14; /* make `current' a kernel virtual address */ \
	;;

	#ifdef MINSTATE_VIRT
	# define MINSTATE_START_SAVE_MIN MINSTATE_START_SAVE_MIN_VIRT
	# define MINSTATE_END_SAVE_MIN MINSTATE_END_SAVE_MIN_VIRT
	#endif

	#ifdef MINSTATE_PHYS
	# define MINSTATE_START_SAVE_MIN MINSTATE_START_SAVE_MIN_PHYS
	# define MINSTATE_END_SAVE_MIN MINSTATE_END_SAVE_MIN_PHYS
	#endif

	/*
	* DO_SAVE_MIN switches to the kernel stacks (if necessary) and saves
	* the minimum state necessary that allows us to turn psr.ic back
	* on.
	*
	* Assumed state upon entry:
	* psr.ic: off
	* r31: contains saved predicates (pr)
	*
	* Upon exit, the state is as follows:
	* psr.ic: off
	* r2 = points to &pt_regs.r16
	* r8 = contents of ar.ccv
	* r9 = contents of ar.csd
	* r10 = contents of ar.ssd
	* r11 = FPSR_DEFAULT
	* r12 = kernel sp (kernel virtual address)
	* r13 = points to current task_struct (kernel virtual address)
	* p15 = TRUE if psr.i is set in cr.ipsr
	* predicate registers (other than p2, p3, and p15), b6, r3, r14, r15:
	* preserved
	*
	* Note that psr.ic is NOT turned on by this macro. This is so that
	* we can pass interruption state as arguments to a handler.
	*/
	#define DO_SAVE_MIN(COVER,SAVE_IFS,EXTRA) \
	mov r29=cr.ipsr; \
	mov r17=IA64_KR(CURRENT); /* r1 = current (physical) */ \
	mov r20=r1; \
	mov r27=ar.rsc; \
	mov r25=ar.unat; \
	mov r26=ar.pfs; \
	mov r21=ar.fpsr; \
	mov r28=cr.iip; \
	COVER; \
	;; \
	invala; \
	extr.u r16=r29,32,2; /* extract psr.cpl */ \
	;; \
	cmp.eq pKern,pUser=r0,r16; /* are we in kernel mode already? (psr.cpl==0) */ \
	mov r1=r17; \
	/* switch from user to kernel RBS: */ \
	;; \
	SAVE_IFS; \
	MINSTATE_START_SAVE_MIN \
	adds r17=2L1_CACHE_BYTES,r1; / really: biggest cache-line size */ \
	adds r16=PT(CR_IPSR),r1; \
	;; \
	lfetch.fault.excl.nt1 [r17],L1_CACHE_BYTES; \
	st8 [r16]=r29; /* save cr.ipsr */ \
	;; \
	lfetch.fault.excl.nt1 [r17]; \
	;; \
	adds r16=PT(R8),r1; /* initialize first base pointer */ \
	adds r17=PT(R9),r1; /* initialize second base pointer */ \
	;; \
	.mem.offset 0,0; st8.spill [r16]=r8,16; \
	.mem.offset 8,0; st8.spill [r17]=r9,16; \
	;; \
	.mem.offset 0,0; st8.spill [r16]=r10,24; \
	.mem.offset 8,0; st8.spill [r17]=r11,32; \
	;; \
	st8 [r16]=r28,8; /* save cr.iip */ \
	mov r28=b0; /* rCRIIP=branch reg b0 */ \
	(pKern) mov r18=r0; /* make sure r18 isn't NaT */ \
	mov r8=ar.ccv; \
	mov r9=ar.csd; \
	mov r10=ar.ssd; \
	movl r11=FPSR_DEFAULT; /* L-unit */ \
	;; \
	st8 [r16]=r30,16; /* save cr.ifs */ \
	st8 [r17]=r25,16; /* save ar.unat */ \
	(pUser) sub r18=r18,r22; /* r18=RSE.ndirty8 / \
	;; \
	st8 [r16]=r26,16; /* save ar.pfs */ \
	st8 [r17]=r27,16; /* save ar.rsc */ \
	tbit.nz p15,p0=r29,IA64_PSR_I_BIT \
	;; /* avoid RAW on r16 & r17 */ \
	(pKern) adds r16=16,r16; /* skip over ar_rnat field */ \
	(pKern) adds r17=16,r17; /* skip over ar_bspstore field */ \
	(pUser) st8 [r16]=r24,16; /* save ar.rnat */ \
	(pUser) st8 [r17]=r23,16; /* save ar.bspstore */ \
	;; \
	st8 [r16]=r31,16; /* save predicates */ \
	st8 [r17]=r28,16; /* save b0 */ \
	shl r18=r18,16; /* compute ar.rsc to be used for "loadrs" */ \
	;; \
	st8 [r16]=r18,16; /* save ar.rsc value for "loadrs" */ \
	st8.spill [r17]=r20,16; /* save original r1 */ \
	;; \
	.mem.offset 0,0; st8.spill [r16]=r12,16; \
	.mem.offset 8,0; st8.spill [r17]=r13,16; \
	cmp.eq pNonSys,pSys=r0,r0 /* initialize pSys=0, pNonSys=1 */ \
	;; \
	.mem.offset 0,0; st8 [r16]=r21,PT(R14)-PT(AR_FPSR); /* ar.fpsr */ \
	.mem.offset 8,0; st8.spill [r17]=r15,PT(R3)-PT(R15); \
	adds r12=-16,r1; /* switch to kernel memory stack (with 16 bytes of scratch) */ \
	;; \
	mov r13=IA64_KR(CURRENT); /* establish `current' */ \
	.mem.offset 0,0; st8.spill [r16]=r14,8; \
	dep r14=-1,r0,61,3; \
	;; \
	.mem.offset 0,0; st8.spill [r16]=r2,16; \
	.mem.offset 8,0; st8.spill [r17]=r3,16; \
	adds r2=IA64_PT_REGS_R16_OFFSET,r1; \
	;; \
	EXTRA; \
	movl r1=__gp; /* establish kernel global pointer */ \
	;; \
	MINSTATE_END_SAVE_MIN

	/*
	* SAVE_REST saves the remainder of pt_regs (with psr.ic on).
	*
	* Assumed state upon entry:
	* psr.ic: on
	* r2: points to &pt_regs.r16
	* r3: points to &pt_regs.r17
	* r8: contents of ar.ccv
	* r9: contents of ar.csd
	* r10: contents of ar.ssd
	* r11: FPSR_DEFAULT
	*
	* Registers r14 and r15 are guaranteed not to be touched by SAVE_REST.
	*/
	#define SAVE_REST \
	.mem.offset 0,0; st8.spill [r2]=r16,16; \
	.mem.offset 8,0; st8.spill [r3]=r17,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r18,16; \
	.mem.offset 8,0; st8.spill [r3]=r19,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r20,16; \
	.mem.offset 8,0; st8.spill [r3]=r21,16; \
	mov r18=b6; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r22,16; \
	.mem.offset 8,0; st8.spill [r3]=r23,16; \
	mov r19=b7; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r24,16; \
	.mem.offset 8,0; st8.spill [r3]=r25,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r26,16; \
	.mem.offset 8,0; st8.spill [r3]=r27,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r28,16; \
	.mem.offset 8,0; st8.spill [r3]=r29,16; \
	;; \
	.mem.offset 0,0; st8.spill [r2]=r30,16; \
	.mem.offset 8,0; st8.spill [r3]=r31,32; \
	;; \
	mov ar.fpsr=r11; /* M-unit */ \
	st8 [r2]=r8,8; /* ar.ccv */ \
	adds r24=PT(B6)-PT(F7),r3; \
	;; \
	stf.spill [r2]=f6,32; \
	stf.spill [r3]=f7,32; \
	;; \
	stf.spill [r2]=f8,32; \
	stf.spill [r3]=f9,32; \
	;; \
	stf.spill [r2]=f10; \
	stf.spill [r3]=f11; \
	adds r25=PT(B7)-PT(F11),r3; \
	;; \
	st8 [r24]=r18,16; /* b6 */ \
	st8 [r25]=r19,16; /* b7 */ \
	;; \
	st8 [r24]=r9; /* ar.csd */ \
	st8 [r25]=r10; /* ar.ssd */ \
	;;

	#define SAVE_MIN_WITH_COVER DO_SAVE_MIN(cover, mov r30=cr.ifs,)
	#define SAVE_MIN_WITH_COVER_R19 DO_SAVE_MIN(cover, mov r30=cr.ifs, mov r15=r19)
	#define SAVE_MIN DO_SAVE_MIN( , mov r30=r0, )