[deb_xorg-server.git] / hw / xfree86 / x86emu / debug.c

/****************************************************************************
*
*						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(const 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(const char *x, int y)
{
    char temp[100];

    snprintf(temp, sizeof(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");
}
Commit	Line	Data
a09e091a JB	1	/****************************************************************************
	2	*
	3	* Realmode X86 Emulator Library
	4	*
	5	* Copyright (C) 1996-1999 SciTech Software, Inc.
	6	* Copyright (C) David Mosberger-Tang
	7	* Copyright (C) 1999 Egbert Eich
	8	*
	9	* ========================================================================
	10	*
	11	* Permission to use, copy, modify, distribute, and sell this software and
	12	* its documentation for any purpose is hereby granted without fee,
	13	* provided that the above copyright notice appear in all copies and that
	14	* both that copyright notice and this permission notice appear in
	15	* supporting documentation, and that the name of the authors not be used
	16	* in advertising or publicity pertaining to distribution of the software
	17	* without specific, written prior permission. The authors makes no
	18	* representations about the suitability of this software for any purpose.
	19	* It is provided "as is" without express or implied warranty.
	20	*
	21	* THE AUTHORS DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
	22	* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
	23	* EVENT SHALL THE AUTHORS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
	24	* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
	25	* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
	26	* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
	27	* PERFORMANCE OF THIS SOFTWARE.
	28	*
	29	* ========================================================================
	30	*
	31	* Language: ANSI C
	32	* Environment: Any
	33	* Developer: Kendall Bennett
	34	*
	35	* Description: This file contains the code to handle debugging of the
	36	* emulator.
	37	*
	38	****************************************************************************/
	39
	40	#include "x86emu/x86emui.h"
	41	#include <stdio.h>
	42	#include <string.h>
	43	#ifndef NO_SYS_HEADERS
	44	#include <stdarg.h>
	45	#include <stdlib.h>
	46	#endif
	47
	48	/----------------------------- Implementation ----------------------------/
	49
	50	#ifdef DEBUG
	51
	52	static void print_encoded_bytes(u16 s, u16 o);
	53	static void print_decoded_instruction(void);
	54	static int parse_line(char s, int ps, int *n);
	55
	56	/* should look something like debug's output. */
	57	void
	58	X86EMU_trace_regs(void)
	59	{
	60	if (DEBUG_TRACE()) {
	61	x86emu_dump_regs();
	62	}
	63	if (DEBUG_DECODE() && !DEBUG_DECODE_NOPRINT()) {
	64	printk("%04x:%04x ", M.x86.saved_cs, M.x86.saved_ip);
65	print_encoded_bytes(M.x86.saved_cs, M.x86.saved_ip);
66	print_decoded_instruction();
67	}
68	}
69
70	void
71	X86EMU_trace_xregs(void)
72	{
73	if (DEBUG_TRACE()) {
74	x86emu_dump_xregs();
75	}
76	}
77
78	void
79	x86emu_just_disassemble(void)
80	{
81	/*
82	* This routine called if the flag DEBUG_DISASSEMBLE is set kind
83	* of a hack!
84	*/
85	printk("%04x:%04x ", M.x86.saved_cs, M.x86.saved_ip);
86	print_encoded_bytes(M.x86.saved_cs, M.x86.saved_ip);
87	print_decoded_instruction();
88	}
89
90	static void
91	disassemble_forward(u16 seg, u16 off, int n)
92	{
93	X86EMU_sysEnv tregs;
94	int i;
95	u8 op1;
96
97	/*
98	* hack, hack, hack. What we do is use the exact machinery set up
99	* for execution, except that now there is an additional state
100	* flag associated with the "execution", and we are using a copy
101	* of the register struct. All the major opcodes, once fully
102	* decoded, have the following two steps: TRACE_REGS(r,m);
103	* SINGLE_STEP(r,m); which disappear if DEBUG is not defined to
104	* the preprocessor. The TRACE_REGS macro expands to:
105	*
106	* if (debug&DEBUG_DISASSEMBLE)
107	* {just_disassemble(); goto EndOfInstruction;}
108	* if (debug&DEBUG_TRACE) trace_regs(r,m);
109	*
110	* ...... and at the last line of the routine.
111	*
112	* EndOfInstruction: end_instr();
113	*
114	* Up to the point where TRACE_REG is expanded, NO modifications
115	* are done to any register EXCEPT the IP register, for fetch and
116	* decoding purposes.
117	*
118	* This was done for an entirely different reason, but makes a
119	* nice way to get the system to help debug codes.
120	*/
121	tregs = M;
122	tregs.x86.R_IP = off;
123	tregs.x86.R_CS = seg;
124
125	/* reset the decoding buffers */
126	tregs.x86.enc_str_pos = 0;
127	tregs.x86.enc_pos = 0;
128
129	/* turn on the "disassemble only, no execute" flag */
130	tregs.x86.debug \|= DEBUG_DISASSEMBLE_F;
131
132	/* DUMP NEXT n instructions to screen in straight_line fashion */
133	/*
134	* This looks like the regular instruction fetch stream, except
135	* that when this occurs, each fetched opcode, upon seeing the
136	* DEBUG_DISASSEMBLE flag set, exits immediately after decoding
137	* the instruction. XXX --- CHECK THAT MEM IS NOT AFFECTED!!!
138	* Note the use of a copy of the register structure...
139	*/
140	for (i = 0; i < n; i++) {
141	op1 = (*sys_rdb) (((u32) M.x86.R_CS << 4) + (M.x86.R_IP++));
142	(x86emu_optab[op1]) (op1);
143	}
144	/* end major hack mode. */
145	}
146
147	void
148	x86emu_check_ip_access(void)
149	{
150	/* NULL as of now */
151	}
152
153	void
154	x86emu_check_sp_access(void)
155	{
156	}
157
158	void
159	x86emu_check_mem_access(u32 dummy)
160	{
161	/* check bounds, etc */
162	}
163
164	void
165	x86emu_check_data_access(uint dummy1, uint dummy2)
166	{
167	/* check bounds, etc */
168	}
169
170	void
171	x86emu_inc_decoded_inst_len(int x)
172	{
173	M.x86.enc_pos += x;
174	}
175
176	void
177	x86emu_decode_printf(const char *x)
178	{
179	sprintf(M.x86.decoded_buf + M.x86.enc_str_pos, "%s", x);
180	M.x86.enc_str_pos += strlen(x);
181	}
182
183	void
184	x86emu_decode_printf2(const char *x, int y)
185	{
186	char temp[100];
187
188	snprintf(temp, sizeof(temp), x, y);
189	sprintf(M.x86.decoded_buf + M.x86.enc_str_pos, "%s", temp);
190	M.x86.enc_str_pos += strlen(temp);
191	}
192
193	void
194	x86emu_end_instr(void)
195	{
196	M.x86.enc_str_pos = 0;
197	M.x86.enc_pos = 0;
198	}
199
200	static void
201	print_encoded_bytes(u16 s, u16 o)
202	{
203	int i;
204	char buf1[64];
205
206	for (i = 0; i < M.x86.enc_pos; i++) {
207	sprintf(buf1 + 2 * i, "%02x", fetch_data_byte_abs(s, o + i));
208	}
209	printk("%-20s", buf1);
210	}
211
212	static void
213	print_decoded_instruction(void)
214	{
215	printk("%s", M.x86.decoded_buf);
216	}
217
218	void
219	x86emu_print_int_vect(u16 iv)
220	{
221	u16 seg, off;
222
223	if (iv > 256)
224	return;
225	seg = fetch_data_word_abs(0, iv * 4);
226	off = fetch_data_word_abs(0, iv * 4 + 2);
227	printk("%04x:%04x ", seg, off);
228	}
229
230	void
231	X86EMU_dump_memory(u16 seg, u16 off, u32 amt)
232	{
233	u32 start = off & 0xfffffff0;
234	u32 end = (off + 16) & 0xfffffff0;
235	u32 i;
236	u32 current;
237
238	current = start;
239	while (end <= off + amt) {
240	printk("%04x:%04x ", seg, start);
241	for (i = start; i < off; i++)
242	printk(" ");
243	for (; i < end; i++)
244	printk("%02x ", fetch_data_byte_abs(seg, i));
245	printk("\n");
246	start = end;
247	end = start + 16;
248	}
249	}
250
251	void
252	x86emu_single_step(void)
253	{
254	char s[1024];
255	int ps[10];
256	int ntok;
257	int cmd;
258	int done;
259	int segment;
260	int offset;
261	static int breakpoint;
262	static int noDecode = 1;
263
264	char *p;
265
266	if (DEBUG_BREAK()) {
267	if (M.x86.saved_ip != breakpoint) {
268	return;
269	}
270	else {
271	M.x86.debug &= ~DEBUG_DECODE_NOPRINT_F;
272	M.x86.debug \|= DEBUG_TRACE_F;
273	M.x86.debug &= ~DEBUG_BREAK_F;
274	print_decoded_instruction();
275	X86EMU_trace_regs();
276	}
277	}
278	done = 0;
279	offset = M.x86.saved_ip;
280	while (!done) {
281	printk("-");
282	p = fgets(s, 1023, stdin);
283	cmd = parse_line(s, ps, &ntok);
284	switch (cmd) {
285	case 'u':
286	disassemble_forward(M.x86.saved_cs, (u16) offset, 10);
287	break;
288	case 'd':
289	if (ntok == 2) {
290	segment = M.x86.saved_cs;
291	offset = ps[1];
292	X86EMU_dump_memory(segment, (u16) offset, 16);
293	offset += 16;
294	}
295	else if (ntok == 3) {
296	segment = ps[1];
297	offset = ps[2];
298	X86EMU_dump_memory(segment, (u16) offset, 16);
299	offset += 16;
300	}
301	else {
302	segment = M.x86.saved_cs;
303	X86EMU_dump_memory(segment, (u16) offset, 16);
304	offset += 16;
305	}
306	break;
307	case 'c':
308	M.x86.debug ^= DEBUG_TRACECALL_F;
309	break;
310	case 's':
311	M.x86.debug ^= DEBUG_SVC_F \| DEBUG_SYS_F \| DEBUG_SYSINT_F;
312	break;
313	case 'r':
314	X86EMU_trace_regs();
315	break;
316	case 'x':
317	X86EMU_trace_xregs();
318	break;
319	case 'g':
320	if (ntok == 2) {
321	breakpoint = ps[1];
322	if (noDecode) {
323	M.x86.debug \|= DEBUG_DECODE_NOPRINT_F;
324	}
325	else {
326	M.x86.debug &= ~DEBUG_DECODE_NOPRINT_F;
327	}
328	M.x86.debug &= ~DEBUG_TRACE_F;
329	M.x86.debug \|= DEBUG_BREAK_F;
330	done = 1;
331	}
332	break;
333	case 'q':
334	M.x86.debug \|= DEBUG_EXIT;
335	return;
336	case 'P':
337	noDecode = (noDecode) ? 0 : 1;
338	printk("Toggled decoding to %s\n", (noDecode) ? "FALSE" : "TRUE");
339	break;
340	case 't':
341	case 0:
342	done = 1;
343	break;
344	}
345	}
346	}
347
348	int
349	X86EMU_trace_on(void)
350	{
351	return M.x86.debug \|= DEBUG_STEP_F \| DEBUG_DECODE_F \| DEBUG_TRACE_F;
352	}
353
354	int
355	X86EMU_trace_off(void)
356	{
357	return M.x86.debug &= ~(DEBUG_STEP_F \| DEBUG_DECODE_F \| DEBUG_TRACE_F);
358	}
359
360	static int
361	parse_line(char s, int ps, int *n)
362	{
363	int cmd;
364
365	*n = 0;
366	while (s == ' ' \|\| s == '\t')
367	s++;
368	ps[n] = s;
369	switch (*s) {
370	case '\n':
371	*n += 1;
372	return 0;
373	default:
374	cmd = *s;
375	*n += 1;
376	}
377
378	while (1) {
379	while (s != ' ' && s != '\t' && *s != '\n')
380	s++;
381
382	if (*s == '\n')
383	return cmd;
384
385	while (s == ' ' \|\| s == '\t')
386	s++;
387
388	sscanf(s, "%x", &ps[*n]);
389	*n += 1;
390	}
391	}
392
393	#endif /* DEBUG */
394
395	void
396	x86emu_dump_regs(void)
397	{
398	printk("\tAX=%04x ", M.x86.R_AX);
399	printk("BX=%04x ", M.x86.R_BX);
400	printk("CX=%04x ", M.x86.R_CX);
401	printk("DX=%04x ", M.x86.R_DX);
402	printk("SP=%04x ", M.x86.R_SP);
403	printk("BP=%04x ", M.x86.R_BP);
404	printk("SI=%04x ", M.x86.R_SI);
405	printk("DI=%04x\n", M.x86.R_DI);
406	printk("\tDS=%04x ", M.x86.R_DS);
407	printk("ES=%04x ", M.x86.R_ES);
408	printk("SS=%04x ", M.x86.R_SS);
409	printk("CS=%04x ", M.x86.R_CS);
410	printk("IP=%04x ", M.x86.R_IP);
411	if (ACCESS_FLAG(F_OF))
412	printk("OV "); /* CHECKED... */
413	else
414	printk("NV ");
415	if (ACCESS_FLAG(F_DF))
416	printk("DN ");
417	else
418	printk("UP ");
419	if (ACCESS_FLAG(F_IF))
420	printk("EI ");
421	else
422	printk("DI ");
423	if (ACCESS_FLAG(F_SF))
424	printk("NG ");
425	else
426	printk("PL ");
427	if (ACCESS_FLAG(F_ZF))
428	printk("ZR ");
429	else
430	printk("NZ ");
431	if (ACCESS_FLAG(F_AF))
432	printk("AC ");
433	else
434	printk("NA ");
435	if (ACCESS_FLAG(F_PF))
436	printk("PE ");
437	else
438	printk("PO ");
439	if (ACCESS_FLAG(F_CF))
440	printk("CY ");
441	else
442	printk("NC ");
443	printk("\n");
444	}
445
446	void
447	x86emu_dump_xregs(void)
448	{
449	printk("\tEAX=%08x ", M.x86.R_EAX);
450	printk("EBX=%08x ", M.x86.R_EBX);
451	printk("ECX=%08x ", M.x86.R_ECX);
452	printk("EDX=%08x \n", M.x86.R_EDX);
453	printk("\tESP=%08x ", M.x86.R_ESP);
454	printk("EBP=%08x ", M.x86.R_EBP);
455	printk("ESI=%08x ", M.x86.R_ESI);
456	printk("EDI=%08x\n", M.x86.R_EDI);
457	printk("\tDS=%04x ", M.x86.R_DS);
458	printk("ES=%04x ", M.x86.R_ES);
459	printk("SS=%04x ", M.x86.R_SS);
460	printk("CS=%04x ", M.x86.R_CS);
461	printk("EIP=%08x\n\t", M.x86.R_EIP);
462	if (ACCESS_FLAG(F_OF))
463	printk("OV "); /* CHECKED... */
464	else
465	printk("NV ");
466	if (ACCESS_FLAG(F_DF))
467	printk("DN ");
468	else
469	printk("UP ");
470	if (ACCESS_FLAG(F_IF))
471	printk("EI ");
472	else
473	printk("DI ");
474	if (ACCESS_FLAG(F_SF))
475	printk("NG ");
476	else
477	printk("PL ");
478	if (ACCESS_FLAG(F_ZF))
479	printk("ZR ");
480	else
481	printk("NZ ");
482	if (ACCESS_FLAG(F_AF))
483	printk("AC ");
484	else
485	printk("NA ");
486	if (ACCESS_FLAG(F_PF))
487	printk("PE ");
488	else
489	printk("PO ");
490	if (ACCESS_FLAG(F_CF))
491	printk("CY ");
492	else
493	printk("NC ");
494	printk("\n");
495	}