glibc/sysdeps/mips/sys/asm.h

/* Copyright (C) 1997-2020 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _SYS_ASM_H
#define _SYS_ASM_H

#include <sgidefs.h>

#ifndef CAT
# define __CAT(str1,str2) str1##str2
# define CAT(str1,str2) __CAT(str1,str2)
#endif

/* Redefined as nonempty in the internal header.  */
#define __mips_cfi_startproc /* Empty.  */
#define __mips_cfi_endproc /* Empty.  */

/*
 * Macros to handle different pointer/register sizes for 32/64-bit code
 *
 * 64 bit address space isn't used yet, so we may use the R3000 32 bit
 * defines for now.
 */
#if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32
# define PTR .word
# define PTRSIZE 4
# define PTRLOG 2
#elif _MIPS_SIM == _ABI64
# define PTR .dword
# define PTRSIZE 8
# define PTRLOG 3
#endif

/*
 * PIC specific declarations
 */
#if _MIPS_SIM == _ABIO32
# ifdef __PIC__
#  define CPRESTORE(register) \
		.cprestore register
#  define CPLOAD(register) \
		.cpload register
# else
#  define CPRESTORE(register)
#  define CPLOAD(register)
# endif

# define CPADD(register) \
		.cpadd	register

/*
 * Set gp when at 1st instruction
 */
# define SETUP_GP					\
		.set noreorder;				\
		.cpload $25;				\
		.set reorder
/* Set gp when not at 1st instruction */
# define SETUP_GPX(r)					\
		.set noreorder;				\
		move r, $31;	 /* Save old ra.  */	\
		bal 10f; /* Find addr of cpload.  */	\
		nop;					\
10:							\
		.cpload $31;				\
		move $31, r;				\
		.set reorder
# define SETUP_GPX_L(r, l)				\
		.set noreorder;				\
		move r, $31;	 /* Save old ra.  */	\
		bal l;   /* Find addr of cpload.  */	\
		nop;					\
l:							\
		.cpload $31;				\
		move $31, r;				\
		.set reorder
# define SAVE_GP(x) \
		.cprestore x /* Save gp trigger t9/jalr conversion.	 */
# define SETUP_GP64(a, b)
# define SETUP_GPX64(a, b)
# define SETUP_GPX64_L(cp_reg, ra_save, l)
# define RESTORE_GP64
# define USE_ALT_CP(a)
#else /* _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32 */
/*
 * For callee-saved gp calling convention:
 */
# define SETUP_GP
# define SETUP_GPX(r)
# define SETUP_GPX_L(r, l)
# define SAVE_GP(x)

# define SETUP_GP64(gpoffset, proc) \
		.cpsetup $25, gpoffset, proc
# define SETUP_GPX64(cp_reg, ra_save)			\
		move ra_save, $31; /* Save old ra.  */	\
		.set noreorder;				\
		bal 10f; /* Find addr of .cpsetup.  */	\
		nop;					\
10:							\
		.set reorder;				\
		.cpsetup $31, cp_reg, 10b;		\
		move $31, ra_save
# define SETUP_GPX64_L(cp_reg, ra_save, l)  \
		move ra_save, $31; /* Save old ra.  */	\
		.set noreorder;				\
		bal l;   /* Find addr of .cpsetup.  */	\
		nop;					\
l:							\
		.set reorder;				\
		.cpsetup $31, cp_reg, l;		\
		move $31, ra_save
# define RESTORE_GP64 \
		.cpreturn
/* Use alternate register for context pointer.  */
# define USE_ALT_CP(reg)	\
		.cplocal reg
#endif /* _MIPS_SIM != _ABIO32 */

/*
 * Stack Frame Definitions
 */
#if _MIPS_SIM == _ABIO32
# define NARGSAVE 4 /* Space for 4 argument registers must be allocated.  */
#endif
#if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
# define NARGSAVE 0 /* No caller responsibilities.  */
#endif


/*
 * LEAF - declare leaf routine
 */
#define	LEAF(symbol)                                    \
		.globl	symbol;                         \
		.align	2;                              \
		.type	symbol,@function;               \
		.ent	symbol,0;                       \
symbol:		.frame	sp,0,ra;			\
		__mips_cfi_startproc

/*
 * NESTED - declare nested routine entry point
 */
#define	NESTED(symbol, framesize, rpc)                  \
		.globl	symbol;                         \
		.align	2;                              \
		.type	symbol,@function;               \
		.ent	symbol,0;                       \
symbol:		.frame	sp, framesize, rpc;		\
		__mips_cfi_startproc

/*
 * END - mark end of function
 */
#ifndef END
# define END(function)                                   \
		__mips_cfi_endproc;			\
		.end	function;		        \
		.size	function,.-function
#endif

/*
 * EXPORT - export definition of symbol
 */
#define	EXPORT(symbol)                                  \
		.globl	symbol;                         \
symbol:		__mips_cfi_startproc

/*
 * ABS - export absolute symbol
 */
#define	ABS(symbol,value)                               \
		.globl	symbol;                         \
symbol		=	value

#define	PANIC(msg)                                      \
		.set	push;				\
		.set	reorder;                        \
		la	a0,8f;                          \
		jal	panic;                          \
9:		b	9b;                             \
		.set	pop;				\
		TEXT(msg)

/*
 * Print formated string
 */
#define PRINT(string)                                   \
		.set	push;				\
		.set	reorder;                        \
		la	a0,8f;                          \
		jal	printk;                         \
		.set	pop;				\
		TEXT(string)

#define	TEXT(msg)                                       \
		.data;                                  \
8:		.asciiz	msg;                            \
		.previous;

/*
 * Build text tables
 */
#define TTABLE(string)                                  \
		.text;                                  \
		.word	1f;                             \
		.previous;                              \
		.data;                                  \
1:		.asciz	string;                         \
		.previous

/*
 * MIPS IV pref instruction.
 * Use with .set noreorder only!
 *
 * MIPS IV implementations are free to treat this as a nop.  The R5000
 * is one of them.  So we should have an option not to use this instruction.
 */
#if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) \
    || (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
# define PREF(hint,addr)                                 \
		pref	hint,addr
# define PREFX(hint,addr)                                \
		prefx	hint,addr
#else
# define PREF(hint,addr)
# define PREFX(hint,addr)
#endif

/*
 * MIPS ISA IV/V movn/movz instructions and equivalents for older CPUs.
 */
#if _MIPS_ISA == _MIPS_ISA_MIPS1
# define MOVN(rd,rs,rt)					\
		.set	push;				\
		.set	reorder;			\
		beqz	rt,9f;				\
		move	rd,rs;				\
		.set	pop;				\
9:
# define MOVZ(rd,rs,rt)					\
		.set	push;				\
		.set	reorder;			\
		bnez	rt,9f;				\
		move	rd,rt;				\
		.set	pop;				\
9:
#endif /* _MIPS_ISA == _MIPS_ISA_MIPS1 */
#if (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3)
# define MOVN(rd,rs,rt)					\
		.set	push;				\
		.set	noreorder;			\
		bnezl	rt,9f;				\
		move	rd,rs;				\
		.set	pop;				\
9:
# define MOVZ(rd,rs,rt)					\
		.set	push;				\
		.set	noreorder;			\
		beqzl	rt,9f;				\
		movz	rd,rs;				\
		.set	pop;				\
9:
#endif /* (_MIPS_ISA == _MIPS_ISA_MIPS2) || (_MIPS_ISA == _MIPS_ISA_MIPS3) */
#if (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) \
    || (_MIPS_ISA == _MIPS_ISA_MIPS32) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
# define MOVN(rd,rs,rt)					\
		movn	rd,rs,rt
# define MOVZ(rd,rs,rt)					\
		movz	rd,rs,rt
#endif /* (_MIPS_ISA == _MIPS_ISA_MIPS4) || (_MIPS_ISA == _MIPS_ISA_MIPS5) */

/*
 * Stack alignment
 */
#if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
# define ALSZ	15
# define ALMASK	~15
#else
# define ALSZ	7
# define ALMASK	~7
#endif

/*
 * Size of a register
 */
#if _MIPS_SIM == _ABI64 || _MIPS_SIM == _ABIN32
# define SZREG	8
#else
# define SZREG	4
#endif

/*
 * Use the following macros in assemblercode to load/store registers,
 * pointers etc.
 */
#if (SZREG == 4)
# define REG_S sw
# define REG_L lw
#else
# define REG_S sd
# define REG_L ld
#endif

/*
 * How to add/sub/load/store/shift C int variables.
 */
#if (_MIPS_SZINT == 32)
# define INT_ADD	add
# define INT_ADDI	addi
# define INT_ADDU	addu
# define INT_ADDIU	addiu
# define INT_SUB	sub
# define INT_SUBI	subi
# define INT_SUBU	subu
# define INT_SUBIU	subu
# define INT_L		lw
# define INT_S		sw
#endif

#if (_MIPS_SZINT == 64)
# define INT_ADD	dadd
# define INT_ADDI	daddi
# define INT_ADDU	daddu
# define INT_ADDIU	daddiu
# define INT_SUB	dsub
# define INT_SUBI	dsubi
# define INT_SUBU	dsubu
# define INT_SUBIU	dsubu
# define INT_L		ld
# define INT_S		sd
#endif

/*
 * How to add/sub/load/store/shift C long variables.
 */
#if (_MIPS_SZLONG == 32)
# define LONG_ADD	add
# define LONG_ADDI	addi
# define LONG_ADDU	addu
# define LONG_ADDIU	addiu
# define LONG_SUB	sub
# define LONG_SUBI	subi
# define LONG_SUBU	subu
# define LONG_SUBIU	subu
# define LONG_L		lw
# define LONG_S		sw
# define LONG_SLL	sll
# define LONG_SLLV	sllv
# define LONG_SRL	srl
# define LONG_SRLV	srlv
# define LONG_SRA	sra
# define LONG_SRAV	srav
#endif

#if (_MIPS_SZLONG == 64)
# define LONG_ADD	dadd
# define LONG_ADDI	daddi
# define LONG_ADDU	daddu
# define LONG_ADDIU	daddiu
# define LONG_SUB	dsub
# define LONG_SUBI	dsubi
# define LONG_SUBU	dsubu
# define LONG_SUBIU	dsubu
# define LONG_L		ld
# define LONG_S		sd
# define LONG_SLL	dsll
# define LONG_SLLV	dsllv
# define LONG_SRL	dsrl
# define LONG_SRLV	dsrlv
# define LONG_SRA	dsra
# define LONG_SRAV	dsrav
#endif

/*
 * How to add/sub/load/store/shift pointers.
 */
#if (_MIPS_SIM == _ABIO32 && _MIPS_SZPTR == 32)
# define PTR_ADD	add
# define PTR_ADDI	addi
# define PTR_ADDU	addu
# define PTR_ADDIU	addiu
# define PTR_SUB	sub
# define PTR_SUBI	subi
# define PTR_SUBU	subu
# define PTR_SUBIU	subu
# define PTR_L		lw
# define PTR_LA		la
# define PTR_S		sw
# define PTR_SLL	sll
# define PTR_SLLV	sllv
# define PTR_SRL	srl
# define PTR_SRLV	srlv
# define PTR_SRA	sra
# define PTR_SRAV	srav

# define PTR_SCALESHIFT	2
#endif

#if _MIPS_SIM == _ABIN32
# define PTR_ADD	add
# define PTR_ADDI	addi
# define PTR_SUB	sub
# define PTR_SUBI	subi
#if !defined __mips_isa_rev || __mips_isa_rev < 6
# define PTR_ADDU	add /* no u */
# define PTR_ADDIU	addi /* no u */
# define PTR_SUBU	sub /* no u */
# define PTR_SUBIU	sub /* no u */
#else
# define PTR_ADDU       addu
# define PTR_ADDIU      addiu
# define PTR_SUBU       subu
# define PTR_SUBIU      subu
#endif
# define PTR_L		lw
# define PTR_LA		la
# define PTR_S		sw
# define PTR_SLL	sll
# define PTR_SLLV	sllv
# define PTR_SRL	srl
# define PTR_SRLV	srlv
# define PTR_SRA	sra
# define PTR_SRAV	srav

# define PTR_SCALESHIFT	2
#endif

#if (_MIPS_SIM == _ABIO32 && _MIPS_SZPTR == 64 /* o64??? */) \
    || _MIPS_SIM == _ABI64
# define PTR_ADD	dadd
# define PTR_ADDI	daddi
# define PTR_ADDU	daddu
# define PTR_ADDIU	daddiu
# define PTR_SUB	dsub
# define PTR_SUBI	dsubi
# define PTR_SUBU	dsubu
# define PTR_SUBIU	dsubu
# define PTR_L		ld
# define PTR_LA		dla
# define PTR_S		sd
# define PTR_SLL	dsll
# define PTR_SLLV	dsllv
# define PTR_SRL	dsrl
# define PTR_SRLV	dsrlv
# define PTR_SRA	dsra
# define PTR_SRAV	dsrav

# define PTR_SCALESHIFT	3
#endif

/*
 * Some cp0 registers were extended to 64bit for MIPS III.
 */
#if (_MIPS_ISA == _MIPS_ISA_MIPS1) || (_MIPS_ISA == _MIPS_ISA_MIPS2) \
    || (_MIPS_ISA == _MIPS_ISA_MIPS32)
# define MFC0	mfc0
# define MTC0	mtc0
#endif
#if (_MIPS_ISA == _MIPS_ISA_MIPS3) || (_MIPS_ISA == _MIPS_ISA_MIPS4) \
    || (_MIPS_ISA == _MIPS_ISA_MIPS5) || (_MIPS_ISA == _MIPS_ISA_MIPS64)
# define MFC0	dmfc0
# define MTC0	dmtc0
#endif

/* The MIPS architectures do not have a uniform memory model.  Particular
   platforms may provide additional guarantees - for instance, the R4000
   LL and SC instructions implicitly perform a SYNC, and the 4K promises
   strong ordering.

   However, in the absence of those guarantees, we must assume weak ordering
   and SYNC explicitly where necessary.

   Some obsolete MIPS processors may not support the SYNC instruction.  This
   applies to "true" MIPS I processors; most of the processors which compile
   using MIPS I implement parts of MIPS II.  */

#ifndef MIPS_SYNC
# define MIPS_SYNC	sync
#endif

#endif /* sys/asm.h */