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.
170 lines
5.0 KiB
C
170 lines
5.0 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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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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* @(#)profile.h 8.1 (Berkeley) 6/11/93
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* $FreeBSD$
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*/
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#ifndef _MACHINE_PROFILE_H_
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#define _MACHINE_PROFILE_H_
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#ifdef _KERNEL
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/*
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* Config generates something to tell the compiler to align functions on 16
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* byte boundaries. A strict alignment is good for keeping the tables small.
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*/
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#define FUNCTION_ALIGNMENT 16
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/*
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* The kernel uses assembler stubs instead of unportable inlines.
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* This is mainly to save a little time when profiling is not enabled,
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* which is the usual case for the kernel.
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*/
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#define _MCOUNT_DECL void mcount
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#define MCOUNT
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#ifdef GUPROF
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#define CALIB_SCALE 1000
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#define KCOUNT(p,index) ((p)->kcount[(index) \
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/ (HISTFRACTION * sizeof(HISTCOUNTER))])
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#define MCOUNT_DECL(s)
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#define MCOUNT_ENTER(s)
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#define MCOUNT_EXIT(s)
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#define PC_TO_I(p, pc) ((uintfptr_t)(pc) - (uintfptr_t)(p)->lowpc)
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#else
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#define MCOUNT_DECL(s) u_long s;
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#ifdef SMP
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extern int mcount_lock;
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#define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); \
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while (!atomic_cmpset_acq_int(&mcount_lock, 0, 1)) \
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/* nothing */ ; }
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#define MCOUNT_EXIT(s) { atomic_store_rel_int(&mcount_lock, 0); \
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write_rflags(s); }
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#else
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#define MCOUNT_ENTER(s) { s = read_rflags(); disable_intr(); }
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#define MCOUNT_EXIT(s) (write_rflags(s))
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#endif
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#endif /* GUPROF */
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#else /* !_KERNEL */
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#define FUNCTION_ALIGNMENT 4
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#define _MCOUNT_DECL static __inline void _mcount
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#ifdef __GNUC__
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#define MCOUNT \
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void \
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mcount() \
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{ \
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uintfptr_t selfpc, frompc; \
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/* \
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* Find the return address for mcount, \
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* and the return address for mcount's caller. \
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* \
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* selfpc = pc pushed by call to mcount \
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*/ \
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asm("movq 8(%%rbp),%0" : "=r" (selfpc)); \
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/* \
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* frompc = pc pushed by call to mcount's caller. \
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* The caller's stack frame has already been built, so %ebp is \
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* the caller's frame pointer. The caller's raddr is in the \
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* caller's frame following the caller's caller's frame pointer.\
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*/ \
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asm("movq (%%rbp),%0" : "=r" (frompc)); \
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frompc = ((uintfptr_t *)frompc)[1]; \
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_mcount(frompc, selfpc); \
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}
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#else /* __GNUC__ */
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#define MCOUNT \
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void \
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mcount() \
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{ \
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}
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#endif /* __GNUC__ */
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typedef unsigned long uintfptr_t;
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#endif /* _KERNEL */
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/*
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* An unsigned integral type that can hold non-negative difference between
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* function pointers.
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*/
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typedef u_int fptrdiff_t;
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#ifdef _KERNEL
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void mcount(uintfptr_t frompc, uintfptr_t selfpc);
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void kmupetext(uintfptr_t nhighpc);
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#ifdef GUPROF
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struct gmonparam;
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void nullfunc_loop_profiled(void);
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void nullfunc_profiled(void);
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void startguprof(struct gmonparam *p);
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void stopguprof(struct gmonparam *p);
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#else
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#define startguprof(p)
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#define stopguprof(p)
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#endif /* GUPROF */
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#else /* !_KERNEL */
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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#ifdef __GNUC__
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void mcount(void) __asm(".mcount");
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#endif
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static void _mcount(uintfptr_t frompc, uintfptr_t selfpc);
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__END_DECLS
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#endif /* _KERNEL */
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#ifdef GUPROF
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/* XXX doesn't quite work outside kernel yet. */
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extern int cputime_bias;
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__BEGIN_DECLS
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int cputime(void);
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void empty_loop(void);
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void mexitcount(uintfptr_t selfpc);
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void nullfunc(void);
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void nullfunc_loop(void);
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__END_DECLS
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#endif
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#endif /* !_MACHINE_PROFILE_H_ */
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