488 lines
12 KiB
C
488 lines
12 KiB
C
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/****************************************************************************
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*
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* Realmode X86 Emulator Library
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*
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* Copyright (C) 1996-1999 SciTech Software, Inc.
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* Copyright (C) David Mosberger-Tang
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* Copyright (C) 1999 Egbert Eich
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*
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* ========================================================================
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and that
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* both that copyright notice and this permission notice appear in
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* supporting documentation, and that the name of the authors not be used
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* in advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The authors makes no
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* representations about the suitability of this software for any purpose.
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* It is provided "as is" without express or implied warranty.
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*
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* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*
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* ========================================================================
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*
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* Language: ANSI C
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* Environment: Any
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* Developer: Kendall Bennett
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*
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* Description: This file contains the code to handle debugging of the
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* emulator.
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*
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****************************************************************************/
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#include "x86emu/x86emui.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#ifndef NO_SYS_HEADERS
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#include <stdlib.h>
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#endif
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/*----------------------------- Implementation ----------------------------*/
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#ifdef DEBUG
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static void print_encoded_bytes(u16 s, u16 o);
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static void print_decoded_instruction(void);
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static int parse_line(char *s, int *ps, int *n);
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/* should look something like debug's output. */
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void
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X86EMU_trace_regs(void)
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{
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if (DEBUG_TRACE()) {
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x86emu_dump_regs();
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}
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if (DEBUG_DECODE() && !DEBUG_DECODE_NOPRINT()) {
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printk("%04x:%04x ", M.x86.saved_cs, M.x86.saved_ip);
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print_encoded_bytes(M.x86.saved_cs, M.x86.saved_ip);
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print_decoded_instruction();
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}
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}
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void
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X86EMU_trace_xregs(void)
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{
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if (DEBUG_TRACE()) {
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x86emu_dump_xregs();
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}
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}
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void
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x86emu_just_disassemble(void)
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{
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/*
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* This routine called if the flag DEBUG_DISASSEMBLE is set kind
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* of a hack!
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*/
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printk("%04x:%04x ", M.x86.saved_cs, M.x86.saved_ip);
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print_encoded_bytes(M.x86.saved_cs, M.x86.saved_ip);
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print_decoded_instruction();
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}
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static void
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disassemble_forward(u16 seg, u16 off, int n)
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{
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X86EMU_sysEnv tregs;
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int i;
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u8 op1;
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/*
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* hack, hack, hack. What we do is use the exact machinery set up
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* for execution, except that now there is an additional state
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* flag associated with the "execution", and we are using a copy
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* of the register struct. All the major opcodes, once fully
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* decoded, have the following two steps: TRACE_REGS(r,m);
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* SINGLE_STEP(r,m); which disappear if DEBUG is not defined to
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* the preprocessor. The TRACE_REGS macro expands to:
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*
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* if (debug&DEBUG_DISASSEMBLE)
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* {just_disassemble(); goto EndOfInstruction;}
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* if (debug&DEBUG_TRACE) trace_regs(r,m);
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*
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* ...... and at the last line of the routine.
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*
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* EndOfInstruction: end_instr();
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*
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* Up to the point where TRACE_REG is expanded, NO modifications
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* are done to any register EXCEPT the IP register, for fetch and
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* decoding purposes.
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*
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* This was done for an entirely different reason, but makes a
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* nice way to get the system to help debug codes.
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*/
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tregs = M;
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tregs.x86.R_IP = off;
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tregs.x86.R_CS = seg;
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/* reset the decoding buffers */
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tregs.x86.enc_str_pos = 0;
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tregs.x86.enc_pos = 0;
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/* turn on the "disassemble only, no execute" flag */
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tregs.x86.debug |= DEBUG_DISASSEMBLE_F;
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/* DUMP NEXT n instructions to screen in straight_line fashion */
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/*
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* This looks like the regular instruction fetch stream, except
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* that when this occurs, each fetched opcode, upon seeing the
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* DEBUG_DISASSEMBLE flag set, exits immediately after decoding
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* the instruction. XXX --- CHECK THAT MEM IS NOT AFFECTED!!!
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* Note the use of a copy of the register structure...
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*/
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for (i = 0; i < n; i++) {
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op1 = (*sys_rdb) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP++));
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(x86emu_optab[op1]) (op1);
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}
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/* end major hack mode. */
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}
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void
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x86emu_check_ip_access(void)
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{
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/* NULL as of now */
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}
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void
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x86emu_check_sp_access(void)
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{
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}
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void
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x86emu_check_mem_access(u32 dummy)
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{
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/* check bounds, etc */
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}
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void
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x86emu_check_data_access(uint dummy1, uint dummy2)
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{
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/* check bounds, etc */
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}
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void
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x86emu_inc_decoded_inst_len(int x)
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{
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M.x86.enc_pos += x;
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}
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void
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x86emu_decode_printf(const char *x, ...)
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{
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va_list ap;
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char temp[100];
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va_start(ap, x);
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vsnprintf(temp, sizeof(temp), x, ap);
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va_end(ap);
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sprintf(M.x86.decoded_buf + M.x86.enc_str_pos, "%s", temp);
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M.x86.enc_str_pos += strlen(temp);
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}
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void
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x86emu_end_instr(void)
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{
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M.x86.enc_str_pos = 0;
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M.x86.enc_pos = 0;
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}
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static void
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print_encoded_bytes(u16 s, u16 o)
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{
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int i;
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char buf1[64];
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for (i = 0; i < M.x86.enc_pos; i++) {
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sprintf(buf1 + 2 * i, "%02x", fetch_data_byte_abs(s, o + i));
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}
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printk("%-20s", buf1);
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}
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static void
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print_decoded_instruction(void)
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{
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printk("%s", M.x86.decoded_buf);
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}
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void
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x86emu_print_int_vect(u16 iv)
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{
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u16 seg, off;
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if (iv > 256)
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return;
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seg = fetch_data_word_abs(0, iv * 4);
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off = fetch_data_word_abs(0, iv * 4 + 2);
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printk("%04x:%04x ", seg, off);
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}
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void
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X86EMU_dump_memory(u16 seg, u16 off, u32 amt)
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{
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u32 start = off & 0xfffffff0;
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u32 end = (off + 16) & 0xfffffff0;
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u32 i;
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while (end <= off + amt) {
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printk("%04x:%04x ", seg, start);
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for (i = start; i < off; i++)
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printk(" ");
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for (; i < end; i++)
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printk("%02x ", fetch_data_byte_abs(seg, i));
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printk("\n");
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start = end;
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end = start + 16;
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}
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}
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void
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x86emu_single_step(void)
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{
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char s[1024];
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int ps[10];
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int ntok;
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int cmd;
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int done;
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int segment;
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int offset;
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static int breakpoint;
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static int noDecode = 1;
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if (DEBUG_BREAK()) {
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if (M.x86.saved_ip != breakpoint) {
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return;
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}
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else {
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M.x86.debug &= ~DEBUG_DECODE_NOPRINT_F;
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M.x86.debug |= DEBUG_TRACE_F;
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M.x86.debug &= ~DEBUG_BREAK_F;
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print_decoded_instruction();
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X86EMU_trace_regs();
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}
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}
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done = 0;
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offset = M.x86.saved_ip;
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while (!done) {
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printk("-");
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(void)fgets(s, 1023, stdin);
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cmd = parse_line(s, ps, &ntok);
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switch (cmd) {
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case 'u':
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disassemble_forward(M.x86.saved_cs, (u16) offset, 10);
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break;
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case 'd':
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if (ntok == 2) {
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segment = M.x86.saved_cs;
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offset = ps[1];
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X86EMU_dump_memory(segment, (u16) offset, 16);
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offset += 16;
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}
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else if (ntok == 3) {
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segment = ps[1];
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offset = ps[2];
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X86EMU_dump_memory(segment, (u16) offset, 16);
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offset += 16;
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}
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else {
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segment = M.x86.saved_cs;
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X86EMU_dump_memory(segment, (u16) offset, 16);
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offset += 16;
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}
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break;
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case 'c':
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M.x86.debug ^= DEBUG_TRACECALL_F;
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break;
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case 's':
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M.x86.debug ^= DEBUG_SVC_F | DEBUG_SYS_F | DEBUG_SYSINT_F;
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break;
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case 'r':
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X86EMU_trace_regs();
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break;
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case 'x':
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X86EMU_trace_xregs();
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break;
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case 'g':
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if (ntok == 2) {
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breakpoint = ps[1];
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if (noDecode) {
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M.x86.debug |= DEBUG_DECODE_NOPRINT_F;
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}
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else {
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M.x86.debug &= ~DEBUG_DECODE_NOPRINT_F;
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}
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M.x86.debug &= ~DEBUG_TRACE_F;
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M.x86.debug |= DEBUG_BREAK_F;
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done = 1;
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}
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break;
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case 'q':
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M.x86.debug |= DEBUG_EXIT;
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return;
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case 'P':
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noDecode = (noDecode) ? 0 : 1;
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printk("Toggled decoding to %s\n", (noDecode) ? "FALSE" : "TRUE");
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break;
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case 't':
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case 0:
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done = 1;
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break;
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}
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}
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}
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int
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X86EMU_trace_on(void)
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{
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return M.x86.debug |= DEBUG_STEP_F | DEBUG_DECODE_F | DEBUG_TRACE_F;
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}
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int
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X86EMU_trace_off(void)
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{
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return M.x86.debug &= ~(DEBUG_STEP_F | DEBUG_DECODE_F | DEBUG_TRACE_F);
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}
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static int
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parse_line(char *s, int *ps, int *n)
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{
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int cmd;
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*n = 0;
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while (*s == ' ' || *s == '\t')
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s++;
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ps[*n] = *s;
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switch (*s) {
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case '\n':
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*n += 1;
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return 0;
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default:
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cmd = *s;
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*n += 1;
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}
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while (1) {
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while (*s != ' ' && *s != '\t' && *s != '\n')
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s++;
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if (*s == '\n')
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return cmd;
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while (*s == ' ' || *s == '\t')
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s++;
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sscanf(s, "%x", &ps[*n]);
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*n += 1;
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}
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}
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#endif /* DEBUG */
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void
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x86emu_dump_regs(void)
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{
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printk("\tAX=%04x ", M.x86.R_AX);
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printk("BX=%04x ", M.x86.R_BX);
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printk("CX=%04x ", M.x86.R_CX);
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printk("DX=%04x ", M.x86.R_DX);
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|
|
printk("SP=%04x ", M.x86.R_SP);
|
||
|
|
printk("BP=%04x ", M.x86.R_BP);
|
||
|
|
printk("SI=%04x ", M.x86.R_SI);
|
||
|
|
printk("DI=%04x\n", M.x86.R_DI);
|
||
|
|
printk("\tDS=%04x ", M.x86.R_DS);
|
||
|
|
printk("ES=%04x ", M.x86.R_ES);
|
||
|
|
printk("SS=%04x ", M.x86.R_SS);
|
||
|
|
printk("CS=%04x ", M.x86.R_CS);
|
||
|
|
printk("IP=%04x ", M.x86.R_IP);
|
||
|
|
if (ACCESS_FLAG(F_OF))
|
||
|
|
printk("OV "); /* CHECKED... */
|
||
|
|
else
|
||
|
|
printk("NV ");
|
||
|
|
if (ACCESS_FLAG(F_DF))
|
||
|
|
printk("DN ");
|
||
|
|
else
|
||
|
|
printk("UP ");
|
||
|
|
if (ACCESS_FLAG(F_IF))
|
||
|
|
printk("EI ");
|
||
|
|
else
|
||
|
|
printk("DI ");
|
||
|
|
if (ACCESS_FLAG(F_SF))
|
||
|
|
printk("NG ");
|
||
|
|
else
|
||
|
|
printk("PL ");
|
||
|
|
if (ACCESS_FLAG(F_ZF))
|
||
|
|
printk("ZR ");
|
||
|
|
else
|
||
|
|
printk("NZ ");
|
||
|
|
if (ACCESS_FLAG(F_AF))
|
||
|
|
printk("AC ");
|
||
|
|
else
|
||
|
|
printk("NA ");
|
||
|
|
if (ACCESS_FLAG(F_PF))
|
||
|
|
printk("PE ");
|
||
|
|
else
|
||
|
|
printk("PO ");
|
||
|
|
if (ACCESS_FLAG(F_CF))
|
||
|
|
printk("CY ");
|
||
|
|
else
|
||
|
|
printk("NC ");
|
||
|
|
printk("\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
x86emu_dump_xregs(void)
|
||
|
|
{
|
||
|
|
printk("\tEAX=%08x ", M.x86.R_EAX);
|
||
|
|
printk("EBX=%08x ", M.x86.R_EBX);
|
||
|
|
printk("ECX=%08x ", M.x86.R_ECX);
|
||
|
|
printk("EDX=%08x \n", M.x86.R_EDX);
|
||
|
|
printk("\tESP=%08x ", M.x86.R_ESP);
|
||
|
|
printk("EBP=%08x ", M.x86.R_EBP);
|
||
|
|
printk("ESI=%08x ", M.x86.R_ESI);
|
||
|
|
printk("EDI=%08x\n", M.x86.R_EDI);
|
||
|
|
printk("\tDS=%04x ", M.x86.R_DS);
|
||
|
|
printk("ES=%04x ", M.x86.R_ES);
|
||
|
|
printk("SS=%04x ", M.x86.R_SS);
|
||
|
|
printk("CS=%04x ", M.x86.R_CS);
|
||
|
|
printk("EIP=%08x\n\t", M.x86.R_EIP);
|
||
|
|
if (ACCESS_FLAG(F_OF))
|
||
|
|
printk("OV "); /* CHECKED... */
|
||
|
|
else
|
||
|
|
printk("NV ");
|
||
|
|
if (ACCESS_FLAG(F_DF))
|
||
|
|
printk("DN ");
|
||
|
|
else
|
||
|
|
printk("UP ");
|
||
|
|
if (ACCESS_FLAG(F_IF))
|
||
|
|
printk("EI ");
|
||
|
|
else
|
||
|
|
printk("DI ");
|
||
|
|
if (ACCESS_FLAG(F_SF))
|
||
|
|
printk("NG ");
|
||
|
|
else
|
||
|
|
printk("PL ");
|
||
|
|
if (ACCESS_FLAG(F_ZF))
|
||
|
|
printk("ZR ");
|
||
|
|
else
|
||
|
|
printk("NZ ");
|
||
|
|
if (ACCESS_FLAG(F_AF))
|
||
|
|
printk("AC ");
|
||
|
|
else
|
||
|
|
printk("NA ");
|
||
|
|
if (ACCESS_FLAG(F_PF))
|
||
|
|
printk("PE ");
|
||
|
|
else
|
||
|
|
printk("PO ");
|
||
|
|
if (ACCESS_FLAG(F_CF))
|
||
|
|
printk("CY ");
|
||
|
|
else
|
||
|
|
printk("NC ");
|
||
|
|
printk("\n");
|
||
|
|
}
|