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

/*	$NetBSD: asm.h,v 1.38 2011/06/08 05:11:07 matt Exp $	*/

/*
 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
 * Copyright (C) 1995, 1996 TooLs GmbH.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by TooLs GmbH.
 * 4. The name of TooLs GmbH may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef _PPC_ASM_H_
#define _PPC_ASM_H_

#ifdef _LP64

/* ppc64 is always PIC, r2 is always the TOC */

#define	PIC_PLT(x)	.x

#else

#ifdef PIC
#define PIC_PROLOGUE	XXX
#define PIC_EPILOGUE	XXX
#define PIC_PLT(x)	x+32768@plt
#ifdef __STDC__
#define	PIC_TOCNAME(name) 	.LCTOC_##name
#else
#define	PIC_TOCNAME(name) 	.LCTOC_/**/name
#endif
#define	PIC_TOCSETUP(name, reg)						\
		.pushsection ".got2","aw"				;\
	PIC_TOCNAME(name) = . + 32768					;\
		.popsection						;\
		bcl	20,31,1001f					;\
	1001:	mflr	reg						;\
		addis	reg,reg,PIC_TOCNAME(name)-1001b@ha		;\
		addi	reg,reg,PIC_TOCNAME(name)-1001b@l
#define	PIC_GOTSETUP(reg)						\
		bcl	20,31,2002f					;\
	2002:	mflr	reg						;\
		addis	reg,reg,_GLOBAL_OFFSET_TABLE_-2002b@ha		;\
		addi	reg,reg,_GLOBAL_OFFSET_TABLE_-2002b@l
#ifdef	__STDC__
#define PIC_GOT(x)	XXX
#define PIC_GOTOFF(x)	XXX
#else	/* not __STDC__ */
#define PIC_GOT(x)	XXX
#define PIC_GOTOFF(x)	XXX
#endif	/* __STDC__ */
#else
#define PIC_PROLOGUE
#define PIC_EPILOGUE
#define PIC_PLT(x)	x
#define PIC_GOT(x)	x
#define PIC_GOTOFF(x)	x
#define	PIC_GOTSETUP(r)
#define	PIC_TOCSETUP(n, r)
#endif

#endif

#define	_C_LABEL(x)	x
#define	_ASM_LABEL(x)	x

#define	_GLOBAL(x) \
	.data; .align 2; .globl x; x:

#ifdef GPROF
# define _PROF_PROLOGUE	mflr 0; stw 0,4(1); bl _mcount
#else
# define _PROF_PROLOGUE
#endif

#ifdef _LP64

#define	SF_HEADER_SZ	48
#define	SF_PARAM_SZ	64
#define	SF_SZ		(SF_HEADER_SZ + SF_PARAM_SZ)

#define	SF_SP		 0
#define	SF_CR		 8
#define	SF_LR		16
#define	SF_PARAM	SF_HEADER_SZ

#define	ENTRY(y)			\
	.globl	y;			\
	.section ".opd","aw";		\
	.align	3;			\
y:	.quad	.y,.TOC.@tocbase,0;	\
	.previous;			\
	.size	y,24;			\
	.type	.y,@function;		\
	.globl	.y;			\
	.align	3;			\
.y:

#define	CALL(y)				\
	bl	.y;			\
	nop

#define	ENTRY_NOPROFILE(y)	ENTRY(y)
#define	ASENTRY(y)		ENTRY(y)
#else

#define _ENTRY(x) \
	.text; .align 2; .globl x; .type x,@function; x:

#define	ENTRY(y)	_ENTRY(_C_LABEL(y)); _PROF_PROLOGUE
#define	END(y)		.size _C_LABEL(y),.-_C_LABEL(y)

#define	ENTRY_NOPROFILE(y) _ENTRY(_C_LABEL(y))

#define	CALL(y)				\
	bl	y

#define	ASENTRY(y)	_ENTRY(_ASM_LABEL(y)); _PROF_PROLOGUE
#endif

#define	GLOBAL(y)	_GLOBAL(_C_LABEL(y))

#define	ASMSTR		.asciz

#undef __RCSID
#define RCSID(x)	__RCSID(x)
#define	__RCSID(x)	.pushsection .ident; .asciz x; .popsection

#ifdef __ELF__
#define	WEAK_ALIAS(alias,sym)						\
	.weak alias;							\
	alias = sym
#endif
/*
 * STRONG_ALIAS: create a strong alias.
 */
#define STRONG_ALIAS(alias,sym)						\
	.globl alias;							\
	alias = sym

#ifdef __STDC__
#define	WARN_REFERENCES(sym,msg)					\
	.pushsection .gnu.warning. ## sym;				\
	.ascii msg;							\
	.popsection
#else
#define	WARN_REFERENCES(sym,msg)					\
	.pushsection .gnu.warning./**/sym;				\
	.ascii msg;							\
	.popsection
#endif /* __STDC__ */

#ifdef _KERNEL
/*
 * Get cpu_info pointer for current processor.  Always in SPRG0. *ALWAYS*
 */
#define	GET_CPUINFO(r)		mfsprg r,0
/*
 * IN:
 *	R4[er] = first free byte beyond end/esym.
 *
 * OUT:
 *	R1[sp] = new kernel stack
 *	R4[er] = kernelend
 */

#ifdef CI_INTSTK
#define	INIT_CPUINFO_INTSTK(er,tmp1)					\
	addi	er,er,INTSTK;						\
	stptr	er,CI_INTSTK(tmp1)
#else
#define	INIT_CPUINFO_INTSTK(er,tmp1)	/* nothing */
#endif

/*
 * We use lis/ori instead of lis/addi in case tmp2 is r0.
 */
#define	INIT_CPUINFO(er,sp,tmp1,tmp2) 					\
	li	tmp1,PAGE_MASK;						\
	add	er,er,tmp1;						\
	andc	er,er,tmp1;		/* page align */		\
	lis	tmp1,_C_LABEL(cpu_info)@ha;				\
	addi	tmp1,tmp1,_C_LABEL(cpu_info)@l;				\
	mtsprg0	tmp1;			/* save for later use */	\
	INIT_CPUINFO_INTSTK(er,tmp1);					\
	lis	tmp2,_C_LABEL(emptyidlespin)@h;				\
	ori	tmp2,tmp2,_C_LABEL(emptyidlespin)@l;			\
	stptr	tmp2,CI_IDLESPIN(tmp1);					\
	li	tmp2,-1;						\
	stint	tmp2,CI_IDEPTH(tmp1);					\
	li	tmp2,0;							\
	lis	%r13,_C_LABEL(lwp0)@h;					\
	ori	%r13,%r13,_C_LABEL(lwp0)@l;				\
	stptr	er,L_PCB(%r13);		/* XXXuvm_lwp_getuarea */	\
	stptr	tmp1,L_CPU(%r13);	 				\
	addi	er,er,USPACE;		/* stackpointer for lwp0 */	\
	addi	sp,er,-FRAMELEN-CALLFRAMELEN;	/* stackpointer for lwp0 */ \
	stptr	sp,L_MD_UTF(%r13);	/* save in lwp0.l_md.md_utf */	\
		/* er = end of mem reserved for kernel */		\
	li	tmp2,0;							\
	stptr	tmp2,-CALLFRAMELEN(er);	/* end of stack chain */	\
	stptru	tmp2,-CALLFRAMELEN(sp)	/* end of stack chain */

#endif

/* Condition Register Bit Fields */

#if defined(_REGNAMES)
#if defined(_KERNEL) || defined(_STANDALONE)
#define cr0     0
#define cr1     1
#define cr2     2
#define cr3     3
#define cr4     4
#define cr5     5
#define cr6     6
#define cr7     7
#endif

/* General Purpose Registers (GPRs) */

#if defined(_KERNEL) || defined(_STANDALONE)
#define r0      0
#define r1      1
#define r2      2
#define r3      3
#define r4      4
#define r5      5
#define r6      6
#define r7      7
#define r8      8
#define r9      9
#define r10     10
#define r11     11
#define r12     12
#define r13     13
#define r14     14
#define r15     15
#define r16     16
#define r17     17
#define r18     18
#define r19     19
#define r20     20
#define r21     21
#define r22     22
#define r23     23
#define r24     24
#define r25     25
#define r26     26
#define r27     27
#define r28     28
#define r29     29
#define r30     30
#define r31     31
#endif

/* Floating Point Registers (FPRs) */

#if defined(_KERNEL) || defined(_STANDALONE)
#define fr0     0
#define fr1     1
#define fr2     2
#define fr3     3
#define fr4     4
#define fr5     5
#define fr6     6
#define fr7     7
#define fr8     8
#define fr9     9
#define fr10    10
#define fr11    11
#define fr12    12
#define fr13    13
#define fr14    14
#define fr15    15
#define fr16    16
#define fr17    17
#define fr18    18
#define fr19    19
#define fr20    20
#define fr21    21
#define fr22    22
#define fr23    23
#define fr24    24
#define fr25    25
#define fr26    26
#define fr27    27
#define fr28    28
#define fr29    29
#define fr30    30
#define fr31    31
#endif
#endif /* _REGNAMES */

/*
 * Add some psuedo instructions to made sharing of assembly versions of
 * ILP32 and LP64 code possible.
 */
#define ldint	lwz		/* not needed but for completeness */
#define ldintu	lwzu		/* not needed but for completeness */
#define stint	stw		/* not needed but for completeness */
#define stintu	stwu		/* not needed but for completeness */

#ifndef _LP64

#define ldlong	lwz		/* load "C" long */
#define ldlongu	lwzu		/* load "C" long with udpate */
#define stlong	stw		/* load "C" long */
#define stlongu	stwu		/* load "C" long with udpate */
#define ldptr	lwz		/* load "C" pointer */
#define ldptru	lwzu		/* load "C" pointer with udpate */
#define stptr	stw		/* load "C" pointer */
#define stptru	stwu		/* load "C" pointer with udpate */
#define	ldreg	lwz		/* load PPC general register */
#define	ldregu	lwzu		/* load PPC general register with udpate */
#define	streg	stw		/* load PPC general register */
#define	stregu	stwu		/* load PPC general register with udpate */
#define	SZREG	4		/* 4 byte registers */

#define	lptrarx	lwarx		/* load "C" pointer with reservation */
#define	llongarx lwarx		/* load "C" long with reservation */
#define	lregarx	lwarx		/* load PPC general register with reservation */

#define	stptrcx  stwcx		/* store "C" pointer conditional */
#define	stlongcx stwcx		/* store "C" long conditional */
#define	stregcx  stwcx		/* store PPC general register conditional */

#define	clrrptri  clrrwi	/* clear right "C" pointer immediate */
#define	clrrlongi clrrwi	/* clear right "C" long immediate */
#define	clrrregi  clrrwi	/* clear right PPC general register immediate */

#else

#define ldlong	ld		/* load "C" long */
#define ldlongu	ldu		/* load "C" long with update */
#define stlong	std		/* store "C" long */
#define stlongu	stdu		/* store "C" long with update */
#define ldptr	ld		/* load "C" pointer */
#define ldptru	ldu		/* load "C" pointer with update */
#define stptr	std		/* store "C" pointer */
#define stptru	stdu		/* store "C" pointer with update */
#define	ldreg	ld		/* load PPC general register */
#define	ldregu	ldu		/* load PPC general register with update */
#define	streg	std		/* store PPC general register */
#define	stregu	stdu		/* store PPC general register with update */
/* redefined this to force an error on PPC64 to catch their use.  */
#define	lmw	lmd		/* load multiple PPC general registers */
#define	stmw	stmd		/* store multiple PPC general registers */
#define	SZREG	8		/* 8 byte registers */

#define	lptrarx	ldarx		/* load "C" pointer with reservation */
#define	llongarx ldarx		/* load "C" long with reservation */
#define	lregarx	ldarx		/* load PPC general register with reservation */

#define	stptrcx  stdcx		/* store "C" pointer conditional */
#define	stlongcx stdcx		/* store "C" long conditional */
#define	stregax  stdcx		/* store PPC general register conditional */

#define	clrrptri  clrrdi	/* clear right "C" pointer immediate */
#define	clrrlongi clrrdi	/* clear right "C" long immediate */
#define	clrrregi  clrrdi	/* clear right PPC general register immediate */

#endif

#ifdef _LOCORE
.macro	stmd	r,dst
	i = 0
    .rept	32-\r
	std	i+\r, i*8+\dst
	i = i + 1
    .endr
.endm

.macro	lmd	r,dst
	i = 0
    .rept	32-\r
	ld	i+\r, i*8+\dst
	i = i + 1
    .endr
.endm
#endif

#endif /* !_PPC_ASM_H_ */