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freebsd-skq/sys/mips/include/asm.h
John Baldwin ec56d65061 Consistently use 16-byte alignment for MIPS N32 and N64. 
- Add a new <machine/abi.h> header to hold constants shared between C
  and assembly such as CALLFRAME_SZ.
- Add a new STACK_ALIGN constant to <machine/abi.h> and use it to
  replace hardcoded constants in the kernel and makecontext().  As a
  result of this, ensure the stack pointer on N32 and N64 is 16-byte
  aligned for N32 and N64 after exec(), after pthread_create(), and
  when sending signals rather than 8-byte aligned.

Reviewed by:	jmallett
Sponsored by:	DARPA / AFRL
Differential Revision:	https://reviews.freebsd.org/D13875
2018-01-31 17:36:39 +00:00

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/* $NetBSD: asm.h,v 1.29 2000/12/14 21:29:51 jeffs Exp $ */
/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 THE REGENTS OR CONTRIBUTORS 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.
*
* @(#)machAsmDefs.h 8.1 (Berkeley) 6/10/93
* JNPR: asm.h,v 1.10 2007/08/09 11:23:32 katta
* $FreeBSD$
*/
/*
* machAsmDefs.h --
*
* Macros used when writing assembler programs.
*
* Copyright (C) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* from: Header: /sprite/src/kernel/mach/ds3100.md/RCS/machAsmDefs.h,
* v 1.2 89/08/15 18:28:24 rab Exp SPRITE (DECWRL)
*/
#ifndef _MACHINE_ASM_H_
#define _MACHINE_ASM_H_
#include <machine/abi.h>
#include <machine/regdef.h>
#include <machine/endian.h>
#include <machine/cdefs.h>
#undef __FBSDID
#if !defined(lint) && !defined(STRIP_FBSDID)
#define __FBSDID(s) .ident s
#else
#define __FBSDID(s) /* nothing */
#endif
/*
* Define -pg profile entry code.
* Must always be noreorder, must never use a macro instruction
* Final addiu to t9 must always equal the size of this _KERN_MCOUNT
*/
#define _KERN_MCOUNT \
.set push; \
.set noreorder; \
.set noat; \
subu sp,sp,16; \
sw t9,12(sp); \
move AT,ra; \
lui t9,%hi(_mcount); \
addiu t9,t9,%lo(_mcount); \
jalr t9; \
nop; \
lw t9,4(sp); \
addiu sp,sp,8; \
addiu t9,t9,40; \
.set pop;
#ifdef GPROF
#define MCOUNT _KERN_MCOUNT
#else
#define MCOUNT
#endif
#define _C_LABEL(x) x
#ifdef USE_AENT
#define AENT(x) \
.aent x, 0
#else
#define AENT(x)
#endif
/*
* WARN_REFERENCES: create a warning if the specified symbol is referenced
*/
#define WARN_REFERENCES(_sym,_msg) \
.section .gnu.warning. ## _sym ; .ascii _msg ; .text
#ifdef __ELF__
# define _C_LABEL(x) x
#else
# define _C_LABEL(x) _ ## x
#endif
/*
* WEAK_ALIAS: create a weak alias.
*/
#define WEAK_ALIAS(alias,sym) \
.weak alias; \
alias = sym
/*
* STRONG_ALIAS: create a strong alias.
*/
#define STRONG_ALIAS(alias,sym) \
.globl alias; \
alias = sym
#define GLOBAL(sym) \
.globl sym; sym:
#define ENTRY(sym) \
.text; .globl sym; .ent sym; sym:
#define ASM_ENTRY(sym) \
.text; .globl sym; .type sym,@function; sym:
/*
* LEAF
* A leaf routine does
* - call no other function,
* - never use any register that callee-saved (S0-S8), and
* - not use any local stack storage.
*/
#define LEAF(x) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, 0, ra; \
MCOUNT
/*
* LEAF_NOPROFILE
* No profilable leaf routine.
*/
#define LEAF_NOPROFILE(x) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, 0, ra
/*
* XLEAF
* declare alternate entry to leaf routine
*/
#define XLEAF(x) \
.globl _C_LABEL(x); \
AENT (_C_LABEL(x)); \
_C_LABEL(x):
/*
* NESTED
* A function calls other functions and needs
* therefore stack space to save/restore registers.
*/
#define NESTED(x, fsize, retpc) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, fsize, retpc; \
MCOUNT
/*
* NESTED_NOPROFILE(x)
* No profilable nested routine.
*/
#define NESTED_NOPROFILE(x, fsize, retpc) \
.globl _C_LABEL(x); \
.ent _C_LABEL(x), 0; \
_C_LABEL(x): ; \
.frame sp, fsize, retpc
/*
* XNESTED
* declare alternate entry point to nested routine.
*/
#define XNESTED(x) \
.globl _C_LABEL(x); \
AENT (_C_LABEL(x)); \
_C_LABEL(x):
/*
* END
* Mark end of a procedure.
*/
#define END(x) \
.end _C_LABEL(x)
/*
* IMPORT -- import external symbol
*/
#define IMPORT(sym, size) \
.extern _C_LABEL(sym),size
/*
* EXPORT -- export definition of symbol
*/
#define EXPORT(x) \
.globl _C_LABEL(x); \
_C_LABEL(x):
/*
* VECTOR
* exception vector entrypoint
* XXX: regmask should be used to generate .mask
*/
#define VECTOR(x, regmask) \
.ent _C_LABEL(x),0; \
EXPORT(x); \
#define VECTOR_END(x) \
EXPORT(x ## End); \
END(x)
/*
* Macros to panic and printf from assembly language.
*/
#define PANIC(msg) \
PTR_LA a0, 9f; \
jal _C_LABEL(panic); \
nop; \
MSG(msg)
#define PANIC_KSEG0(msg, reg) PANIC(msg)
#define PRINTF(msg) \
PTR_LA a0, 9f; \
jal _C_LABEL(printf); \
nop; \
MSG(msg)
#define MSG(msg) \
.rdata; \
9: .asciiz msg; \
.text
#define ASMSTR(str) \
.asciiz str; \
.align 3
#if defined(__mips_o32) || defined(__mips_o64)
#define ALSK 7 /* stack alignment */
#define ALMASK -7 /* stack alignment */
#define SZFPREG 4
#define FP_L lwc1
#define FP_S swc1
#else
#define ALSK 15 /* stack alignment */
#define ALMASK -15 /* stack alignment */
#define SZFPREG 8
#define FP_L ldc1
#define FP_S sdc1
#endif
/*
* Endian-independent assembly-code aliases for unaligned memory accesses.
*/
#if _BYTE_ORDER == _LITTLE_ENDIAN
# define LWHI lwr
# define LWLO lwl
# define SWHI swr
# define SWLO swl
# if SZREG == 4
# define REG_LHI lwr
# define REG_LLO lwl
# define REG_SHI swr
# define REG_SLO swl
# else
# define REG_LHI ldr
# define REG_LLO ldl
# define REG_SHI sdr
# define REG_SLO sdl
# endif
#endif
#if _BYTE_ORDER == _BIG_ENDIAN
# define LWHI lwl
# define LWLO lwr
# define SWHI swl
# define SWLO swr
# if SZREG == 4
# define REG_LHI lwl
# define REG_LLO lwr
# define REG_SHI swl
# define REG_SLO swr
# else
# define REG_LHI ldl
# define REG_LLO ldr
# define REG_SHI sdl
# define REG_SLO sdr
# endif
#endif
/*
* While it would be nice to be compatible with the SGI
* REG_L and REG_S macros, because they do not take parameters, it
* is impossible to use them with the _MIPS_SIM_ABIX32 model.
*
* These macros hide the use of mips3 instructions from the
* assembler to prevent the assembler from generating 64-bit style
* ABI calls.
*/
#if _MIPS_SZPTR == 32
#define PTR_ADD add
#define PTR_ADDI addi
#define PTR_ADDU addu
#define PTR_ADDIU addiu
#define PTR_SUB add
#define PTR_SUBI subi
#define PTR_SUBU subu
#define PTR_SUBIU subu
#define PTR_L lw
#define PTR_LA la
#define PTR_LI li
#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_LL ll
#define PTR_SC sc
#define PTR_WORD .word
#define PTR_SCALESHIFT 2
#else /* _MIPS_SZPTR == 64 */
#define PTR_ADD dadd
#define PTR_ADDI daddi
#define PTR_ADDU daddu
#define PTR_ADDIU daddiu
#define PTR_SUB dadd
#define PTR_SUBI dsubi
#define PTR_SUBU dsubu
#define PTR_SUBIU dsubu
#define PTR_L ld
#define PTR_LA dla
#define PTR_LI dli
#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_LL lld
#define PTR_SC scd
#define PTR_WORD .dword
#define PTR_SCALESHIFT 3
#endif /* _MIPS_SZPTR == 64 */
#if _MIPS_SZINT == 32
#define INT_ADD add
#define INT_ADDI addi
#define INT_ADDU addu
#define INT_ADDIU addiu
#define INT_SUB add
#define INT_SUBI subi
#define INT_SUBU subu
#define INT_SUBIU subu
#define INT_L lw
#define INT_LA la
#define INT_S sw
#define INT_SLL sll
#define INT_SLLV sllv
#define INT_SRL srl
#define INT_SRLV srlv
#define INT_SRA sra
#define INT_SRAV srav
#define INT_LL ll
#define INT_SC sc
#define INT_WORD .word
#define INT_SCALESHIFT 2
#else
#define INT_ADD dadd
#define INT_ADDI daddi
#define INT_ADDU daddu
#define INT_ADDIU daddiu
#define INT_SUB dadd
#define INT_SUBI dsubi
#define INT_SUBU dsubu
#define INT_SUBIU dsubu
#define INT_L ld
#define INT_LA dla
#define INT_S sd
#define INT_SLL dsll
#define INT_SLLV dsllv
#define INT_SRL dsrl
#define INT_SRLV dsrlv
#define INT_SRA dsra
#define INT_SRAV dsrav
#define INT_LL lld
#define INT_SC scd
#define INT_WORD .dword
#define INT_SCALESHIFT 3
#endif
#if _MIPS_SZLONG == 32
#define LONG_ADD add
#define LONG_ADDI addi
#define LONG_ADDU addu
#define LONG_ADDIU addiu
#define LONG_SUB add
#define LONG_SUBI subi
#define LONG_SUBU subu
#define LONG_SUBIU subu
#define LONG_L lw
#define LONG_LA la
#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
#define LONG_LL ll
#define LONG_SC sc
#define LONG_WORD .word
#define LONG_SCALESHIFT 2
#else
#define LONG_ADD dadd
#define LONG_ADDI daddi
#define LONG_ADDU daddu
#define LONG_ADDIU daddiu
#define LONG_SUB dadd
#define LONG_SUBI dsubi
#define LONG_SUBU dsubu
#define LONG_SUBIU dsubu
#define LONG_L ld
#define LONG_LA dla
#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
#define LONG_LL lld
#define LONG_SC scd
#define LONG_WORD .dword
#define LONG_SCALESHIFT 3
#endif
#if SZREG == 4
#define REG_L lw
#define REG_S sw
#define REG_LI li
#define REG_ADDU addu
#define REG_SLL sll
#define REG_SLLV sllv
#define REG_SRL srl
#define REG_SRLV srlv
#define REG_SRA sra
#define REG_SRAV srav
#define REG_LL ll
#define REG_SC sc
#define REG_SCALESHIFT 2
#else
#define REG_L ld
#define REG_S sd
#define REG_LI dli
#define REG_ADDU daddu
#define REG_SLL dsll
#define REG_SLLV dsllv
#define REG_SRL dsrl
#define REG_SRLV dsrlv
#define REG_SRA dsra
#define REG_SRAV dsrav
#define REG_LL lld
#define REG_SC scd
#define REG_SCALESHIFT 3
#endif
#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_MIPS64
#define MFC0 dmfc0
#define MTC0 dmtc0
#endif
#if defined(__mips_o32) || defined(__mips_o64)
#ifdef __ABICALLS__
#define CPRESTORE(r) .cprestore r
#define CPLOAD(r) .cpload r
#else
#define CPRESTORE(r) /* not needed */
#define CPLOAD(r) /* not needed */
#endif
#define SETUP_GP \
.set push; \
.set noreorder; \
.cpload t9; \
.set pop
#define SETUP_GPX(r) \
.set push; \
.set noreorder; \
move r,ra; /* save old ra */ \
bal 7f; \
nop; \
7: .cpload ra; \
move ra,r; \
.set pop
#define SETUP_GPX_L(r,lbl) \
.set push; \
.set noreorder; \
move r,ra; /* save old ra */ \
bal lbl; \
nop; \
lbl: .cpload ra; \
move ra,r; \
.set pop
#define SAVE_GP(x) .cprestore x
#define SETUP_GP64(a,b) /* n32/n64 specific */
#define SETUP_GP64_R(a,b) /* n32/n64 specific */
#define SETUP_GPX64(a,b) /* n32/n64 specific */
#define SETUP_GPX64_L(a,b,c) /* n32/n64 specific */
#define RESTORE_GP64 /* n32/n64 specific */
#define USE_ALT_CP(a) /* n32/n64 specific */
#endif /* __mips_o32 || __mips_o64 */
#if defined(__mips_o32) || defined(__mips_o64)
#define REG_PROLOGUE .set push
#define REG_EPILOGUE .set pop
#endif
#if defined(__mips_n32) || defined(__mips_n64)
#define REG_PROLOGUE .set push ; .set mips3
#define REG_EPILOGUE .set pop
#endif
#if defined(__mips_n32) || defined(__mips_n64)
#define SETUP_GP /* o32 specific */
#define SETUP_GPX(r) /* o32 specific */
#define SETUP_GPX_L(r,lbl) /* o32 specific */
#define SAVE_GP(x) /* o32 specific */
#define SETUP_GP64(a,b) .cpsetup $25, a, b
#define SETUP_GPX64(a,b) \
.set push; \
move b,ra; \
.set noreorder; \
bal 7f; \
nop; \
7: .set pop; \
.cpsetup ra, a, 7b; \
move ra,b
#define SETUP_GPX64_L(a,b,c) \
.set push; \
move b,ra; \
.set noreorder; \
bal c; \
nop; \
c: .set pop; \
.cpsetup ra, a, c; \
move ra,b
#define RESTORE_GP64 .cpreturn
#define USE_ALT_CP(a) .cplocal a
#endif /* __mips_n32 || __mips_n64 */
#define GET_CPU_PCPU(reg) \
PTR_L reg, _C_LABEL(pcpup);
/*
* Description of the setjmp buffer
*
* word 0 magic number (dependant on creator)
* 1 RA
* 2 S0
* 3 S1
* 4 S2
* 5 S3
* 6 S4
* 7 S5
* 8 S6
* 9 S7
* 10 SP
* 11 S8
* 12 GP (dependent on ABI)
* 13 signal mask (dependant on magic)
* 14 (con't)
* 15 (con't)
* 16 (con't)
*
* The magic number number identifies the jmp_buf and
* how the buffer was created as well as providing
* a sanity check
*
*/
#define _JB_MAGIC__SETJMP 0xBADFACED
#define _JB_MAGIC_SETJMP 0xFACEDBAD
/* Valid for all jmp_buf's */
#define _JB_MAGIC 0
#define _JB_REG_RA 1
#define _JB_REG_S0 2
#define _JB_REG_S1 3
#define _JB_REG_S2 4
#define _JB_REG_S3 5
#define _JB_REG_S4 6
#define _JB_REG_S5 7
#define _JB_REG_S6 8
#define _JB_REG_S7 9
#define _JB_REG_SP 10
#define _JB_REG_S8 11
#if defined(__mips_n32) || defined(__mips_n64)
#define _JB_REG_GP 12
#endif
/* Only valid with the _JB_MAGIC_SETJMP magic */
#define _JB_SIGMASK 13
#define __JB_SIGMASK_REMAINDER 14 /* sigmask_t is 128-bits */
#define _JB_FPREG_F20 15
#define _JB_FPREG_F21 16
#define _JB_FPREG_F22 17
#define _JB_FPREG_F23 18
#define _JB_FPREG_F24 19
#define _JB_FPREG_F25 20
#define _JB_FPREG_F26 21
#define _JB_FPREG_F27 22
#define _JB_FPREG_F28 23
#define _JB_FPREG_F29 24
#define _JB_FPREG_F30 25
#define _JB_FPREG_F31 26
#define _JB_FPREG_FCSR 27
/*
* Various macros for dealing with TLB hazards
* (a) why so many?
* (b) when to use?
* (c) why not used everywhere?
*/
/*
* Assume that w alaways need nops to escape CP0 hazard
* TODO: Make hazard delays configurable. Stuck with 5 cycles on the moment
* For more info on CP0 hazards see Chapter 7 (p.99) of "MIPS32 Architecture
* For Programmers Volume III: The MIPS32 Privileged Resource Architecture"
*/
#if defined(CPU_NLM)
#define HAZARD_DELAY sll $0,3
#define ITLBNOPFIX sll $0,3
#elif defined(CPU_RMI)
#define HAZARD_DELAY
#define ITLBNOPFIX
#elif defined(CPU_MIPS74K)
#define HAZARD_DELAY sll $0,$0,3
#define ITLBNOPFIX sll $0,$0,3
#else
#define ITLBNOPFIX nop;nop;nop;nop;nop;nop;nop;nop;nop;sll $0,$0,3;
#define HAZARD_DELAY nop;nop;nop;nop;sll $0,$0,3;
#endif
#endif /* !_MACHINE_ASM_H_ */
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