afa8862328
a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* William Jolitz.
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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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* from: @(#)DEFS.h 5.1 (Berkeley) 4/23/90
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* $FreeBSD$
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*/
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#ifndef _MACHINE_ASM_H_
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#define _MACHINE_ASM_H_
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#include <sys/cdefs.h>
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#ifdef PIC
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#define PIC_PLT(x) x@PLT
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#define PIC_GOT(x) x@GOTPCREL(%rip)
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#else
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#define PIC_PLT(x) x
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#define PIC_GOT(x) x
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#endif
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/*
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* CNAME and HIDENAME manage the relationship between symbol names in C
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* and the equivalent assembly language names. CNAME is given a name as
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* it would be used in a C program. It expands to the equivalent assembly
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* language name. HIDENAME is given an assembly-language name, and expands
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* to a possibly-modified form that will be invisible to C programs.
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*/
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#define CNAME(csym) csym
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#define HIDENAME(asmsym) __CONCAT(.,asmsym)
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/* XXX should use .p2align 4,0x90 for -m486. */
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#define _START_ENTRY .text; .p2align 2,0x90
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#define _ENTRY(x) _START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x):
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#ifdef PROF
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#define ALTENTRY(x) _ENTRY(x); \
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pushl %rbp; movl %rsp,%rbp; \
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call PIC_PLT(HIDENAME(mcount)); \
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popl %rbp; \
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jmp 9f
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#define ENTRY(x) _ENTRY(x); \
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pushl %rbp; movl %rsp,%rbp; \
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call PIC_PLT(HIDENAME(mcount)); \
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popl %rbp; \
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9:
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#else
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#define ALTENTRY(x) _ENTRY(x)
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#define ENTRY(x) _ENTRY(x)
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#endif
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#define RCSID(x) .text; .asciz x
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#undef __FBSDID
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#if !defined(lint) && !defined(STRIP_FBSDID)
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#define __FBSDID(s) .ident s
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#else
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#define __FBSDID(s) /* nothing */
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#endif /* not lint and not STRIP_FBSDID */
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#ifdef _ARCH_INDIRECT
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/*
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* Generate code to select between the generic functions and _ARCH_INDIRECT
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* specific ones.
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* XXX nested __CONCATs don't work with non-ANSI cpp's.
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*/
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#define ANAME(x) CNAME(__CONCAT(__CONCAT(__,_ARCH_INDIRECT),x))
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#define ASELNAME(x) CNAME(__CONCAT(__arch_select_,x))
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#define AVECNAME(x) CNAME(__CONCAT(__arch_,x))
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#define GNAME(x) CNAME(__CONCAT(__generic_,x))
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/* Don't bother profiling this. */
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#ifdef PIC
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#define ARCH_DISPATCH(x) \
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_START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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movq PIC_GOT(AVECNAME(x)),%rax; \
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jmpq *(%rax)
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#define ARCH_SELECT(x) _START_ENTRY; \
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.type ASELNAME(x),@function; \
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ASELNAME(x): \
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call PIC_PLT(CNAME(__get_hw_float)); \
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testq %rax,%rax; \
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movq PIC_GOT(ANAME(x)),%rax; \
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jne 8f; \
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movq PIC_GOT(GNAME(x)),%rax; \
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8: \
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movq PIC_GOT(AVECNAME(x)),%rdx; \
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movq %rax,(%rdx); \
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jmpq *%rax
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#else /* !PIC */
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#define ARCH_DISPATCH(x) \
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_START_ENTRY; \
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.globl CNAME(x); .type CNAME(x),@function; CNAME(x): ; \
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jmpw *AVECNAME(x)
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#define ARCH_SELECT(x) _START_ENTRY; \
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.type ASELNAME(x),@function; \
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ASELNAME(x): \
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call CNAME(__get_hw_float); \
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testw %rax,%rax; \
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movw $ANAME(x),%rax; \
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jne 8f; \
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movw $GNAME(x),%rax; \
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8: \
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movw %rax,AVECNAME(x); \
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jmpw *%rax
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#endif /* PIC */
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#define ARCH_VECTOR(x) .data; .p2align 2; \
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.globl AVECNAME(x); \
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.type AVECNAME(x),@object; \
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.size AVECNAME(x),4; \
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AVECNAME(x): .long ASELNAME(x)
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#undef _ENTRY
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#define _ENTRY(x) ARCH_VECTOR(x); ARCH_SELECT(x); ARCH_DISPATCH(x); \
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_START_ENTRY; \
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.globl ANAME(x); .type ANAME(x),@function; ANAME(x):
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#endif /* _ARCH_INDIRECT */
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#endif /* !_MACHINE_ASM_H_ */
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