d4e7039177
doscmd heavily depends on struct sigcontext which luckily is mostly passed
between functions as usion regcontext_t. By redefining union regcontext_t in
terms of mcontext_t almost all bases are covered.
It also seems to me that doscmd was in a transitional state. The redundant
definitions made it difficult to get a clear overview and could easily cause
oversight. To make sure my changes were ok, I went as far as to complete the
transition. It was not exactly necessary, but I expect to have to come back
here some more ("whistle" if I'm wrong :-).
250 lines
6.0 KiB
C
250 lines
6.0 KiB
C
/*
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* Copyright (c) 1992, 1993, 1996
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* Berkeley Software Design, Inc. 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 Berkeley Software
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* Design, Inc.
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*
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* THIS SOFTWARE IS PROVIDED BY Berkeley Software Design, Inc. ``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 Berkeley Software Design, Inc. 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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* BSDI trace.c,v 2.2 1996/04/08 19:33:07 bostic Exp
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*
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* $FreeBSD$
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*/
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#include "doscmd.h"
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#include "trap.h"
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extern FILE *debugf;
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int tmode = 0;
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static u_short *saddr;
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static u_char *iaddr, ibyte;
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/* locals */
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static void printtrace(regcontext_t *REGS, char *buf);
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/*
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* Before exiting to VM86 mode:
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* 1) Always set the trap flag.
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* 2) If this is a POPF or IRET instruction, set the trap flag in the saved
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* flag state on the stack.
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* On enterint from VM86 mode:
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* 1) Restore the trap flag from our saved flag state.
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* 2) If we just finished a POPF or IRET unstruction, patch the saved flag
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* state on the stack.
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*/
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int tracetype;
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int
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resettrace(regcontext_t *REGS)
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{
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if ((R_EFLAGS & PSL_VM) == 0) /* invalid unless handling a vm86 process */
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return (0);
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/* XXX */ return 1;
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switch (tracetype) {
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case 1:
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R_EFLAGS &= ~PSL_T;
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tracetype = 0;
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return (1);
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case 2:
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if ((u_char *)MAKEPTR(R_CS, R_IP - 1) == iaddr)
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R_IP --;
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*iaddr = ibyte;
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tracetype = 0;
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return (1);
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case 3:
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case 4:
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R_EFLAGS &= ~PSL_T;
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*saddr &= ~PSL_T;
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tracetype = 0;
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return (1);
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}
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return (0);
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}
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void
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tracetrap(regcontext_t *REGS)
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{
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u_char *addr;
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int n;
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char buf[100];
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if ((R_EFLAGS & PSL_VM) == 0)
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return;
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addr = (u_char *)MAKEPTR(R_CS, R_IP);
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n = i386dis(R_CS, R_IP, addr, buf, 0);
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printtrace(REGS, buf);
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/* XXX */
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R_EFLAGS |= PSL_T;
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return;
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/* XXX */
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switch (addr[0]) {
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case REPNZ:
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case REPZ:
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tracetype = 2;
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iaddr = (u_char *)MAKEPTR(R_CS, R_IP + n);
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break;
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case PUSHF:
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tracetype = 4;
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saddr = (u_short *)MAKEPTR(R_SS, R_SP - 2);
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break;
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case POPF:
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tracetype = 3;
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saddr = (u_short *)MAKEPTR(R_SS, R_SP + 0);
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break;
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case IRET:
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tracetype = 3;
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saddr = (u_short *)MAKEPTR(R_SS, R_SP + 4);
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#if 0
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printf("IRET: %04x %04x %04x\n",
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((u_short *)MAKEPTR(R_SS, R_SP))[0],
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((u_short *)MAKEPTR(R_SS, R_SP))[1],
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((u_short *)MAKEPTR(R_SS, R_SP))[2]);
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#endif
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break;
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case OPSIZ:
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switch (addr[1]) {
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case PUSHF:
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tracetype = 4;
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saddr = (u_short *)MAKEPTR(R_SS, R_SP - 4);
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break;
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case POPF:
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tracetype = 3;
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saddr = (u_short *)MAKEPTR(R_SS, R_SP + 0);
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break;
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case IRET:
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tracetype = 3;
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saddr = (u_short *)MAKEPTR(R_SS, R_SP + 8);
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break;
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default:
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tracetype = 1;
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break;
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}
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default:
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tracetype = 1;
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break;
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}
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switch (tracetype) {
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case 1:
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case 4:
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if (R_EFLAGS & PSL_T)
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tracetype = 0;
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else
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R_EFLAGS |= PSL_T;
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break;
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case 2:
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if (*iaddr == TRACETRAP)
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tracetype = 0;
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else {
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ibyte = *iaddr;
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*iaddr = TRACETRAP;
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}
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break;
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case 3:
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R_EFLAGS |= PSL_T;
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if (*saddr & PSL_T)
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tracetype = 0;
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else
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*saddr |= PSL_T;
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break;
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}
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}
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inline
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showstate(long flags, long flag, char f)
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{
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putc((flags & flag) ? f : ' ', debugf);
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}
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static void
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printtrace(regcontext_t *REGS, char *buf)
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{
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static int first = 1;
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u_char *addr = (u_char *)MAKEPTR(R_CS, R_IP);
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char *bigfmt = "%04x:%04x "
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#if BIG_DEBUG
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"%02x %02x %02x %02x %02x %02x "
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#endif
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"%-30s "
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"%04x %04x %04x %04x %04x %04x %04x %04x %04x %04x %04x ";
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if (first) {
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fprintf(debugf, "%4s:%4s "
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#if BIG_DEBUG
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".. .. .. .. .. .. "
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#endif
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"%-30s "
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"%4s %4s %4s %4s %4s %4s %4s %4s %4s %4s %4s\n",
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"CS", "IP", "instruction",
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"AX", "BX", "CX", "DX",
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"DI", "SI", "SP", "BP",
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"SS", "DS", "ES");
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first = 0;
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}
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fprintf(debugf, bigfmt,
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R_CS, R_IP,
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#if BIG_DEBUG
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addr[0], addr[1], addr[2], addr[3], addr[4], addr[5],
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#endif
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buf,
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R_AX, R_BX, R_CX, R_DX, R_DI, R_SI, R_SP, R_BP, R_SS, R_DS, R_ES);
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#if 0
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fprintf(debugf, "%04x %04x %04x %04x ",
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((u_short *)VECPTR(0x0D760FCA-14))[0],
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((u_short *)VECPTR(0x0D760FCA-14))[1],
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((u_short *)VECPTR(0x0D760F7A+8))[0],
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((u_short *)VECPTR(0x0D760F7A+8))[1]);
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#endif
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showstate(R_EFLAGS, PSL_C, 'C');
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showstate(R_EFLAGS, PSL_PF, 'P');
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showstate(R_EFLAGS, PSL_AF, 'c');
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showstate(R_EFLAGS, PSL_Z, 'Z');
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showstate(R_EFLAGS, PSL_N, 'N');
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showstate(R_EFLAGS, PSL_T, 'T');
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showstate(R_EFLAGS, PSL_I, 'I');
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showstate(R_EFLAGS, PSL_D, 'D');
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showstate(R_EFLAGS, PSL_V, 'V');
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showstate(R_EFLAGS, PSL_NT, 'n');
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showstate(R_EFLAGS, PSL_RF, 'r');
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showstate(R_EFLAGS, PSL_VM, 'v');
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showstate(R_EFLAGS, PSL_AC, 'a');
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showstate(R_EFLAGS, PSL_VIF, 'i');
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showstate(R_EFLAGS, PSL_VIP, 'p');
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putc('\n', debugf);
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}
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