230 lines
6.9 KiB
C
230 lines
6.9 KiB
C
/* $NetBSD: asm.h,v 1.22 2015/08/23 11:01:24 joerg Exp $ */
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/*
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* Copyright (c) 1994 Allen Briggs
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* All rights reserved.
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*
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* Gleaned from locore.s and sun3 asm.h which had the following copyrights:
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* locore.s:
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* Copyright (c) 1988 University of Utah.
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* Copyright (c) 1982, 1990 The Regents of the University of California.
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* sun3/include/asm.h:
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* Copyright (c) 1993 Adam Glass
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* Copyright (c) 1990 The Regents of the University of California.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _ASM_H_
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#define _ASM_H_
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/* Pull in CCFSZ, CC64FSZ, and BIAS from frame.h */
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#ifndef _LOCORE
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#define _LOCORE
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#endif
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#include <machine/frame.h>
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#ifdef __ELF__
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#define _C_LABEL(name) name
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#else
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#ifdef __STDC__
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#define _C_LABEL(name) _ ## name
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#else
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#define _C_LABEL(name) _/**/name
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#endif
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#endif
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#define _ASM_LABEL(name) name
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#ifdef __PIC__
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/*
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* PIC_PROLOGUE() is akin to the compiler generated function prologue for
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* PIC code. It leaves the address of the Global Offset Table in DEST,
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* clobbering register TMP in the process.
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*
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* We can use two code sequences. We can read the %pc or use the call
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* instruction that saves the pc in %o7. Call requires the branch unit and
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* IEU1, and clobbers %o7 which needs to be restored. This instruction
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* sequence takes about 4 cycles due to instruction interdependence. Reading
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* the pc takes 4 cycles to dispatch and is always dispatched alone. That
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* sequence takes 7 cycles.
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*/
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#ifdef __arch64__
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#define PIC_PROLOGUE(dest,tmp) \
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mov %o7, tmp; \
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sethi %hi(_GLOBAL_OFFSET_TABLE_-4),dest; \
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call 0f; \
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or dest,%lo(_GLOBAL_OFFSET_TABLE_+4),dest; \
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0: \
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add dest,%o7,dest; \
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mov tmp, %o7
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#else
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#define PIC_PROLOGUE(dest,tmp) \
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mov %o7,tmp; 3: call 4f; nop; 4: \
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sethi %hi(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
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or dest,%lo(_C_LABEL(_GLOBAL_OFFSET_TABLE_)-(3b-.)),dest; \
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add dest,%o7,dest; mov tmp,%o7
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#endif
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/*
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* PICCY_SET() does the equivalent of a `set var, %dest' instruction in
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* a PIC-like way, but without involving the Global Offset Table. This
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* only works for VARs defined in the same file *and* in the text segment.
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*/
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#ifdef __arch64__
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#define PICCY_SET(var,dest,tmp) \
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3: rd %pc, tmp; add tmp,(var-3b),dest
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#else
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#define PICCY_SET(var,dest,tmp) \
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mov %o7,tmp; 3: call 4f; nop; 4: \
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add %o7,(var-3b),dest; mov tmp,%o7
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#endif
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#else
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#define PIC_PROLOGUE(dest,tmp)
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#define PICCY_OFFSET(var,dest,tmp)
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#endif
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#define FTYPE(x) .type x,@function
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#define OTYPE(x) .type x,@object
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#define _ENTRY(name) \
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.align 4; .globl name; FTYPE(name); name:
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#ifdef GPROF
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/* see _MCOUNT_ENTRY in profile.h */
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#ifdef __ELF__
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#ifdef __arch64__
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#define _PROF_PROLOGUE \
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.data; .align 8; 1: .word 0; .word 0; \
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.text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call _mcount; \
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or %o0,%lo(1b),%o0; restore
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#else
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#define _PROF_PROLOGUE \
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.data; .align 4; 1: .long 0; \
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.text; save %sp,-96,%sp; sethi %hi(1b),%o0; call _mcount; \
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or %o0,%lo(1b),%o0; restore
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#endif
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#else
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#ifdef __arch64__
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#define _PROF_PROLOGUE \
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.data; .align 8; 1: .word 0; .word 0; \
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.text; save %sp,-CC64FSZ,%sp; sethi %hi(1b),%o0; call mcount; \
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or %o0,%lo(1b),%o0; restore
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#else
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#define _PROF_PROLOGUE \
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.data; .align 4; 1: .long 0; \
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.text; save %sp,-96,%sp; sethi %hi(1b),%o0; call mcount; \
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or %o0,%lo(1b),%o0; restore
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#endif
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#endif
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#else
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#define _PROF_PROLOGUE
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#endif
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#define ENTRY(name) _ENTRY(_C_LABEL(name)); _PROF_PROLOGUE
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#define ENTRY_NOPROFILE(name) _ENTRY(_C_LABEL(name))
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#define ASENTRY(name) _ENTRY(_ASM_LABEL(name)); _PROF_PROLOGUE
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#define FUNC(name) ASENTRY(name)
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#define RODATA(name) .align 4; .text; .globl _C_LABEL(name); \
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OTYPE(_C_LABEL(name)); _C_LABEL(name):
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#define END(y) .size y, . - y
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#define ASMSTR .asciz
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#ifdef __ELF__
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#define RCSID(name) .pushsection ".ident"; .asciz name; .popsection
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#else
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#define RCSID(name) .asciz name
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#endif
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#ifdef NO_KERNEL_RCSIDS
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#define __KERNEL_RCSID(_n, _s) /* nothing */
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#else
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#define __KERNEL_RCSID(_n, _s) RCSID(_s)
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#endif
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#ifdef __ELF__
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#define WEAK_ALIAS(alias,sym) \
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.weak alias; \
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alias = sym
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#endif
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/*
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* STRONG_ALIAS: create a strong alias.
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*/
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#define STRONG_ALIAS(alias,sym) \
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.globl alias; \
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alias = sym
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/*
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* WARN_REFERENCES: create a warning if the specified symbol is referenced.
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*/
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#ifdef __ELF__
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#ifdef __STDC__
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#define WARN_REFERENCES(sym,msg) \
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.pushsection .gnu.warning. ## sym; \
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.ascii msg; \
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.popsection
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#else
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#define WARN_REFERENCES(sym,msg) \
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.pushsection .gnu.warning./**/sym; \
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.ascii msg; \
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.popsection
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#endif /* __STDC__ */
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#else
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#ifdef __STDC__
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#define __STRING(x) #x
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#define WARN_REFERENCES(sym,msg) \
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.stabs msg ## ,30,0,0,0 ; \
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.stabs __STRING(_ ## sym) ## ,1,0,0,0
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#else
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#define __STRING(x) "x"
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#define WARN_REFERENCES(sym,msg) \
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.stabs msg,30,0,0,0 ; \
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.stabs __STRING(_/**/sym),1,0,0,0
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#endif /* __STDC__ */
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#endif /* __ELF__ */
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#ifdef __arch64__
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#define INCR64X(what,r0,r1) \
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sethi %hi(what), r0; \
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ldx [r0 + %lo(what)], r1; \
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inc r1; \
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stx r1, [r0 + %lo(what)]
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#define INCR64(what) INCR64X(what,%o0,%o1)
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#else
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#define INCR64X(what,r0,r1,r2) \
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sethi %hi(what), r2; \
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ldd [r2 + %lo(what)], r0; \
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inccc r1; \
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addx r0, 0, r0; \
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std r0, [r2 + %lo(what)]
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#define INCR64(what) INCR64X(what,%o0,%o1,%l7)
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#endif
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#endif /* _ASM_H_ */
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