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-rw-r--r--x86emu/debug.c430
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diff --git a/x86emu/debug.c b/x86emu/debug.c
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-/****************************************************************************
-*
-* Realmode X86 Emulator Library
-*
-* Copyright (C) 1996-1999 SciTech Software, Inc.
-* Copyright (C) David Mosberger-Tang
-* Copyright (C) 1999 Egbert Eich
-*
-* ========================================================================
-*
-* Permission to use, copy, modify, distribute, and sell this software and
-* its documentation for any purpose is hereby granted without fee,
-* provided that the above copyright notice appear in all copies and that
-* both that copyright notice and this permission notice appear in
-* supporting documentation, and that the name of the authors not be used
-* in advertising or publicity pertaining to distribution of the software
-* without specific, written prior permission. The authors makes no
-* representations about the suitability of this software for any purpose.
-* It is provided "as is" without express or implied warranty.
-*
-* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
-* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
-* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
-* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
-* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
-* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
-* PERFORMANCE OF THIS SOFTWARE.
-*
-* ========================================================================
-*
-* Language: ANSI C
-* Environment: Any
-* Developer: Kendall Bennett
-*
-* Description: This file contains the code to handle debugging of the
-* emulator.
-*
-****************************************************************************/
-
-#include "x86emu/x86emui.h"
-#include <stdio.h>
-#include <string.h>
-#ifndef NO_SYS_HEADERS
-#include <stdarg.h>
-#include <stdlib.h>
-#endif
-
-/*----------------------------- Implementation ----------------------------*/
-
-#ifdef DEBUG
-
-static void print_encoded_bytes (u16 s, u16 o);
-static void print_decoded_instruction (void);
-static int parse_line (char *s, int *ps, int *n);
-
-/* should look something like debug's output. */
-void X86EMU_trace_regs (void)
-{
- if (DEBUG_TRACE()) {
- x86emu_dump_regs();
- }
- if (DEBUG_DECODE() && ! DEBUG_DECODE_NOPRINT()) {
- printk("%04x:%04x ",M.x86.saved_cs, M.x86.saved_ip);
- print_encoded_bytes( M.x86.saved_cs, M.x86.saved_ip);
- print_decoded_instruction();
- }
-}
-
-void X86EMU_trace_xregs (void)
-{
- if (DEBUG_TRACE()) {
- x86emu_dump_xregs();
- }
-}
-
-void x86emu_just_disassemble (void)
-{
- /*
- * This routine called if the flag DEBUG_DISASSEMBLE is set kind
- * of a hack!
- */
- printk("%04x:%04x ",M.x86.saved_cs, M.x86.saved_ip);
- print_encoded_bytes( M.x86.saved_cs, M.x86.saved_ip);
- print_decoded_instruction();
-}
-
-static void disassemble_forward (u16 seg, u16 off, int n)
-{
- X86EMU_sysEnv tregs;
- int i;
- u8 op1;
- /*
- * hack, hack, hack. What we do is use the exact machinery set up
- * for execution, except that now there is an additional state
- * flag associated with the "execution", and we are using a copy
- * of the register struct. All the major opcodes, once fully
- * decoded, have the following two steps: TRACE_REGS(r,m);
- * SINGLE_STEP(r,m); which disappear if DEBUG is not defined to
- * the preprocessor. The TRACE_REGS macro expands to:
- *
- * if (debug&DEBUG_DISASSEMBLE)
- * {just_disassemble(); goto EndOfInstruction;}
- * if (debug&DEBUG_TRACE) trace_regs(r,m);
- *
- * ...... and at the last line of the routine.
- *
- * EndOfInstruction: end_instr();
- *
- * Up to the point where TRACE_REG is expanded, NO modifications
- * are done to any register EXCEPT the IP register, for fetch and
- * decoding purposes.
- *
- * This was done for an entirely different reason, but makes a
- * nice way to get the system to help debug codes.
- */
- tregs = M;
- tregs.x86.R_IP = off;
- tregs.x86.R_CS = seg;
-
- /* reset the decoding buffers */
- tregs.x86.enc_str_pos = 0;
- tregs.x86.enc_pos = 0;
-
- /* turn on the "disassemble only, no execute" flag */
- tregs.x86.debug |= DEBUG_DISASSEMBLE_F;
-
- /* DUMP NEXT n instructions to screen in straight_line fashion */
- /*
- * This looks like the regular instruction fetch stream, except
- * that when this occurs, each fetched opcode, upon seeing the
- * DEBUG_DISASSEMBLE flag set, exits immediately after decoding
- * the instruction. XXX --- CHECK THAT MEM IS NOT AFFECTED!!!
- * Note the use of a copy of the register structure...
- */
- for (i=0; i<n; i++) {
- op1 = (*sys_rdb)(((u32)M.x86.R_CS<<4) + (M.x86.R_IP++));
- (x86emu_optab[op1])(op1);
- }
- /* end major hack mode. */
-}
-
-void x86emu_check_ip_access (void)
-{
- /* NULL as of now */
-}
-
-void x86emu_check_sp_access (void)
-{
-}
-
-void x86emu_check_mem_access (u32 dummy)
-{
- /* check bounds, etc */
-}
-
-void x86emu_check_data_access (uint dummy1, uint dummy2)
-{
- /* check bounds, etc */
-}
-
-void x86emu_inc_decoded_inst_len (int x)
-{
- M.x86.enc_pos += x;
-}
-
-void x86emu_decode_printf (char *x)
-{
- sprintf(M.x86.decoded_buf+M.x86.enc_str_pos,"%s",x);
- M.x86.enc_str_pos += strlen(x);
-}
-
-void x86emu_decode_printf2 (char *x, int y)
-{
- char temp[100];
- sprintf(temp,x,y);
- sprintf(M.x86.decoded_buf+M.x86.enc_str_pos,"%s",temp);
- M.x86.enc_str_pos += strlen(temp);
-}
-
-void x86emu_end_instr (void)
-{
- M.x86.enc_str_pos = 0;
- M.x86.enc_pos = 0;
-}
-
-static void print_encoded_bytes (u16 s, u16 o)
-{
- int i;
- char buf1[64];
- for (i=0; i< M.x86.enc_pos; i++) {
- sprintf(buf1+2*i,"%02x", fetch_data_byte_abs(s,o+i));
- }
- printk("%-20s",buf1);
-}
-
-static void print_decoded_instruction (void)
-{
- printk("%s", M.x86.decoded_buf);
-}
-
-void x86emu_print_int_vect (u16 iv)
-{
- u16 seg,off;
-
- if (iv > 256) return;
- seg = fetch_data_word_abs(0,iv*4);
- off = fetch_data_word_abs(0,iv*4+2);
- printk("%04x:%04x ", seg, off);
-}
-
-void X86EMU_dump_memory (u16 seg, u16 off, u32 amt)
-{
- u32 start = off & 0xfffffff0;
- u32 end = (off+16) & 0xfffffff0;
- u32 i;
- u32 current;
-
- current = start;
- while (end <= off + amt) {
- printk("%04x:%04x ", seg, start);
- for (i=start; i< off; i++)
- printk(" ");
- for ( ; i< end; i++)
- printk("%02x ", fetch_data_byte_abs(seg,i));
- printk("\n");
- start = end;
- end = start + 16;
- }
-}
-
-void x86emu_single_step (void)
-{
- char s[1024];
- int ps[10];
- int ntok;
- int cmd;
- int done;
- int segment;
- int offset;
- static int breakpoint;
- static int noDecode = 1;
-
- char *p;
-
- if (DEBUG_BREAK()) {
- if (M.x86.saved_ip != breakpoint) {
- return;
- } else {
- M.x86.debug &= ~DEBUG_DECODE_NOPRINT_F;
- M.x86.debug |= DEBUG_TRACE_F;
- M.x86.debug &= ~DEBUG_BREAK_F;
- print_decoded_instruction ();
- X86EMU_trace_regs();
- }
- }
- done=0;
- offset = M.x86.saved_ip;
- while (!done) {
- printk("-");
- p = fgets(s, 1023, stdin);
- cmd = parse_line(s, ps, &ntok);
- switch(cmd) {
- case 'u':
- disassemble_forward(M.x86.saved_cs,(u16)offset,10);
- break;
- case 'd':
- if (ntok == 2) {
- segment = M.x86.saved_cs;
- offset = ps[1];
- X86EMU_dump_memory(segment,(u16)offset,16);
- offset += 16;
- } else if (ntok == 3) {
- segment = ps[1];
- offset = ps[2];
- X86EMU_dump_memory(segment,(u16)offset,16);
- offset += 16;
- } else {
- segment = M.x86.saved_cs;
- X86EMU_dump_memory(segment,(u16)offset,16);
- offset += 16;
- }
- break;
- case 'c':
- M.x86.debug ^= DEBUG_TRACECALL_F;
- break;
- case 's':
- M.x86.debug ^= DEBUG_SVC_F | DEBUG_SYS_F | DEBUG_SYSINT_F;
- break;
- case 'r':
- X86EMU_trace_regs();
- break;
- case 'x':
- X86EMU_trace_xregs();
- break;
- case 'g':
- if (ntok == 2) {
- breakpoint = ps[1];
- if (noDecode) {
- M.x86.debug |= DEBUG_DECODE_NOPRINT_F;
- } else {
- M.x86.debug &= ~DEBUG_DECODE_NOPRINT_F;
- }
- M.x86.debug &= ~DEBUG_TRACE_F;
- M.x86.debug |= DEBUG_BREAK_F;
- done = 1;
- }
- break;
- case 'q':
- M.x86.debug |= DEBUG_EXIT;
- return;
- case 'P':
- noDecode = (noDecode)?0:1;
- printk("Toggled decoding to %s\n",(noDecode)?"FALSE":"TRUE");
- break;
- case 't':
- case 0:
- done = 1;
- break;
- }
- }
-}
-
-int X86EMU_trace_on(void)
-{
- return M.x86.debug |= DEBUG_STEP_F | DEBUG_DECODE_F | DEBUG_TRACE_F;
-}
-
-int X86EMU_trace_off(void)
-{
- return M.x86.debug &= ~(DEBUG_STEP_F | DEBUG_DECODE_F | DEBUG_TRACE_F);
-}
-
-static int parse_line (char *s, int *ps, int *n)
-{
- int cmd;
-
- *n = 0;
- while(*s == ' ' || *s == '\t') s++;
- ps[*n] = *s;
- switch (*s) {
- case '\n':
- *n += 1;
- return 0;
- default:
- cmd = *s;
- *n += 1;
- }
-
- while (1) {
- while (*s != ' ' && *s != '\t' && *s != '\n') s++;
-
- if (*s == '\n')
- return cmd;
-
- while(*s == ' ' || *s == '\t') s++;
-
- sscanf(s,"%x",&ps[*n]);
- *n += 1;
- }
-}
-
-#endif /* DEBUG */
-
-void x86emu_dump_regs (void)
-{
- printk("\tAX=%04x ", M.x86.R_AX );
- printk("BX=%04x ", M.x86.R_BX );
- printk("CX=%04x ", M.x86.R_CX );
- printk("DX=%04x ", M.x86.R_DX );
- 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");
-}
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