0f2fe153bc
these two reasons: 1. On ia64 a function pointer does not hold the address of the first instruction of a functions implementation. It holds the address of a function descriptor. Hence the user(), btrap(), eintr() and bintr() prototypes are wrong for getting the actual code address. 2. The logic forces interrupt, trap and exception entry points to be layed-out contiguously. This can not be achieved on ia64 and is generally just bad programming. The MCOUNT_FROMPC_USER macro is used to set the frompc argument to some kernel address which represents any frompc that falls outside the kernel text range. The macro can expand to ~0U to bail out in that case. The MCOUNT_FROMPC_INTR macro is used to set the frompc argument to some kernel address to represent a call to a trap or interrupt handler. This to avoid that the trap or interrupt handler appear to be called from everywhere in the call graph. The macro can expand to ~0U to prevent adjusting frompc. Note that the argument is selfpc, not frompc. This commit defines the macros on all architectures equivalently to the original code in sys/libkern/mcount.c. People can take it from here... Compile-tested on: alpha, amd64, i386, ia64 and sparc64 Boot-tested on: i386
204 lines
5.8 KiB
C
204 lines
5.8 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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* 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 MCOUNT_DECL(s)
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#define MCOUNT_ENTER(s)
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#define MCOUNT_EXIT(s)
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#ifdef __GNUC__
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#define MCOUNT_OVERHEAD(label) \
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__asm __volatile("pushq %0; call __mcount; popq %%rcx" \
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: \
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: "i" (profil) \
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: "ax", "dx", "cx", "di", "si", "r8", "r9", "memory")
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#define MEXITCOUNT_OVERHEAD() \
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__asm __volatile("call .mexitcount; 1:" \
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: : \
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: "ax", "dx", "cx", "di", "si", "r8", "r9", "memory")
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#define MEXITCOUNT_OVERHEAD_GETLABEL(labelp) \
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__asm __volatile("movq $1b,%0" : "=rm" (labelp))
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#elif defined(lint)
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#define MCOUNT_OVERHEAD(label)
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#define MEXITCOUNT_OVERHEAD()
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#define MEXITCOUNT_OVERHEAD_GETLABEL()
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#else
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#error
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#endif /* __GNUC */
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#else /* !GUPROF */
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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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void bintr(void);
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void btrap(void);
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void eintr(void);
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void user(void);
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#define MCOUNT_FROMPC_USER(pc) \
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((pc < (uintfptr_t)VM_MAXUSER_ADDRESS) ? (uintfptr_t)user : pc)
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#define MCOUNT_FROMPC_INTR(pc) \
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((pc >= (uintfptr_t)btrap && pc < (uintfptr_t)eintr) ? \
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((pc >= (uintfptr_t)bintr) ? (uintfptr_t)bintr : \
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(uintfptr_t)btrap) : ~0UL)
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#else /* !_KERNEL */
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#define FUNCTION_ALIGNMENT 4
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#define _MCOUNT_DECL \
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static void _mcount(uintfptr_t frompc, uintfptr_t selfpc) __used; \
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static void _mcount
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#ifdef __GNUC__
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#define MCOUNT __asm(" \n\
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.globl .mcount \n\
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.type .mcount @function \n\
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.mcount: \n\
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pushq %rbp \n\
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movq %rsp,%rbp \n\
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pushq %rdi \n\
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pushq %rsi \n\
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pushq %rdx \n\
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pushq %rcx \n\
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pushq %r8 \n\
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pushq %r9 \n\
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pushq %rax \n\
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movq 8(%rbp),%rsi \n\
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movq (%rbp),%rdi \n\
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movq 8(%rdi),%rdi \n\
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call _mcount \n\
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popq %rax \n\
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popq %r9 \n\
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popq %r8 \n\
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popq %rcx \n\
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popq %rdx \n\
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popq %rsi \n\
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popq %rdi \n\
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leave \n\
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ret \n\
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.size .mcount, . - .mcount");
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#if 0
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/*
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* We could use this, except it doesn't preserve the registers that were
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* being passed with arguments to the function that we were inserted
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* into. I've left it here as documentation of what the code above is
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* supposed to do.
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*/
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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 %rbp 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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#endif
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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 u_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_long fptrdiff_t;
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#ifdef _KERNEL
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void mcount(uintfptr_t frompc, uintfptr_t selfpc);
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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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__END_DECLS
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#endif /* _KERNEL */
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#endif /* !_MACHINE_PROFILE_H_ */
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