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05e634ef64
The following patch adds the addr argument to signal handlers. The kernel with the patch is no more and no less in compliance or in violation of POSIX and ANSI C than the kernel before the patch. The added functionality this addr argument provides is quite useful. It enables an entire class of algorithms which use mprotect to trace memory references. Beside garbage collectors, I have heard of this technique being applied to debuggers and profilers. The only benchmarking I've performed is using akcl to compile maxima: without the kernel patch, it takes 7 hours to compile maxima, while with stratified garbage collection, it only takes 50 minutes. Basically, I can't think of a reason not to add the addr argument and there is a compelling need for it. If you find the patch acceptable, please let me know so I can send my FreeBSD akcl config files to wfs for inclusion in the core akcl release. The old 386BSD config files there won't work on either NetBSD or FreeBSD.
119 lines
3.5 KiB
C
119 lines
3.5 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: @(#)reg.h 5.5 (Berkeley) 1/18/91
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* $Id: reg.h,v 1.4 1993/11/16 09:54:57 davidg Exp $
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*/
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#ifndef _MACHINE_REG_H_
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#define _MACHINE_REG_H_ 1
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/*
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* Location of the users' stored
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* registers within appropriate frame of 'trap' and 'syscall', relative to
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* base of stack frame.
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* Normal usage is u.u_ar0[XX] in kernel.
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*/
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/* When referenced during a trap/exception, registers are at these offsets */
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#define tES (0)
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#define tDS (1)
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#define tEDI (2)
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#define tESI (3)
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#define tEBP (4)
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#define tEBX (6)
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#define tEDX (7)
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#define tECX (8)
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#define tEAX (9)
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#define tERR (11)
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#define tEIP (12)
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#define tCS (13)
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#define tEFLAGS (14)
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#define tESP (15)
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#define tSS (16)
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/* During a system call, registers are at these offsets instead of above. */
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#define sEDI (0)
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#define sESI (1)
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#define sEBP (2)
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#define sEBX (4)
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#define sEDX (5)
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#define sECX (6)
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#define sEAX (7)
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#define sEFLAGS (8)
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#define sEIP (9)
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#define sCS (10)
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#define sESP (11)
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#define sSS (12)
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#define PC sEIP
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#define SP sESP
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#define PS sEFLAGS
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#define R0 sEDX
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#define R1 sECX
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/*
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* Registers accessible to ptrace(2) syscall for debugger
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* The machine-dependent code for PT_{SET,GET}REGS needs to
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* use whichver order, defined above, is correct, so that it
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* is all invisible to the user.
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*/
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struct regs {
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unsigned int r_es;
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unsigned int r_ds;
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unsigned int r_edi;
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unsigned int r_esi;
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unsigned int r_ebp;
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unsigned int r_ebx;
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unsigned int r_edx;
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unsigned int r_ecx;
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unsigned int r_eax;
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unsigned int r_eip;
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unsigned int r_cs;
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unsigned int r_eflags;
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unsigned int r_esp;
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unsigned int r_ss;
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unsigned int r_fs;
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unsigned int r_gs;
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};
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#endif /* _MACHINE_REG_H_ */
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