[qemu.git] / tests / qruncom.c

/*
 * Example of use of user mode libqemu: launch a basic .com DOS
 * executable
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <signal.h>

#include "cpu.h"

//#define SIGTEST

CPUState *cpu_single_env = NULL;

void cpu_outb(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
}

void cpu_outw(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
}

void cpu_outl(CPUState *env, int addr, int val)
{
    fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
}

int cpu_inb(CPUState *env, int addr)
{
    fprintf(stderr, "inb: port=0x%04x\n", addr);
    return 0;
}

int cpu_inw(CPUState *env, int addr)
{
    fprintf(stderr, "inw: port=0x%04x\n", addr);
    return 0;
}

int cpu_inl(CPUState *env, int addr)
{
    fprintf(stderr, "inl: port=0x%04x\n", addr);
    return 0;
}

int cpu_get_pic_interrupt(CPUState *env)
{
    return -1;
}

uint64_t cpu_get_tsc(CPUState *env)
{
    return 0;
}

static void set_gate(void *ptr, unsigned int type, unsigned int dpl, 
                     unsigned long addr, unsigned int sel)
{
    unsigned int e1, e2;
    e1 = (addr & 0xffff) | (sel << 16);
    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
    stl((uint8_t *)ptr, e1);
    stl((uint8_t *)ptr + 4, e2);
}

uint64_t idt_table[256];

/* only dpl matters as we do only user space emulation */
static void set_idt(int n, unsigned int dpl)
{
    set_gate(idt_table + n, 0, dpl, 0, 0);
}

void qemu_free(void *ptr)
{
    free(ptr);
}

void *qemu_malloc(size_t size)
{
    return malloc(size);
}

void qemu_printf(const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    vprintf(fmt, ap);
    va_end(ap);
}

/* XXX: this is a bug in helper2.c */
int errno;

/**********************************************/

#define COM_BASE_ADDR    0x10100

void usage(void)
{
    printf("qruncom version 0.1 (c) 2003 Fabrice Bellard\n"
           "usage: qruncom file.com\n"
           "user mode libqemu demo: run simple .com DOS executables\n");
    exit(1);
}

static inline uint8_t *seg_to_linear(unsigned int seg, unsigned int reg)
{
    return (uint8_t *)((seg << 4) + (reg & 0xffff));
}

static inline void pushw(CPUState *env, int val)
{
    env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | ((env->regs[R_ESP] - 2) & 0xffff);
    *(uint16_t *)seg_to_linear(env->segs[R_SS].selector, env->regs[R_ESP]) = val;
}

static void host_segv_handler(int host_signum, siginfo_t *info, 
                              void *puc)
{
    if (cpu_signal_handler(host_signum, info, puc)) {
        return;
    }
    abort();
}

int main(int argc, char **argv)
{
    uint8_t *vm86_mem;
    const char *filename;
    int fd, ret, seg;
    CPUState *env;

    if (argc != 2)
        usage();
    filename = argv[1];
    
    vm86_mem = mmap((void *)0x00000000, 0x110000, 
                    PROT_WRITE | PROT_READ | PROT_EXEC, 
                    MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
    if (vm86_mem == MAP_FAILED) {
        perror("mmap");
        exit(1);
    }

    /* load the MSDOS .com executable */
    fd = open(filename, O_RDONLY);
    if (fd < 0) {
        perror(filename);
        exit(1);
    }
    ret = read(fd, vm86_mem + COM_BASE_ADDR, 65536 - 256);
    if (ret < 0) {
        perror("read");
        exit(1);
    }
    close(fd);

    /* install exception handler for CPU emulator */
    {
        struct sigaction act;
        
        sigfillset(&act.sa_mask);
        act.sa_flags = SA_SIGINFO;
        //        act.sa_flags |= SA_ONSTACK;

        act.sa_sigaction = host_segv_handler;
        sigaction(SIGSEGV, &act, NULL);
        sigaction(SIGBUS, &act, NULL);
#if defined (TARGET_I386) && defined(USE_CODE_COPY)
        sigaction(SIGFPE, &act, NULL);
#endif
    }

    //    cpu_set_log(CPU_LOG_TB_IN_ASM | CPU_LOG_TB_OUT_ASM | CPU_LOG_EXEC);

    env = cpu_init();

    /* disable code copy to simplify debugging */
    code_copy_enabled = 0;

    /* set user mode state (XXX: should be done automatically by
       cpu_init ?) */
    env->user_mode_only = 1;

    cpu_x86_set_cpl(env, 3);

    env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK;
    /* NOTE: hflags duplicates some of the virtual CPU state */
    env->hflags |= HF_PE_MASK | VM_MASK;

    /* flags setup : we activate the IRQs by default as in user
       mode. We also activate the VM86 flag to run DOS code */
    env->eflags |= IF_MASK | VM_MASK;
    
    /* init basic registers */
    env->eip = 0x100;
    env->regs[R_ESP] = 0xfffe;
    seg = (COM_BASE_ADDR - 0x100) >> 4;

    cpu_x86_load_seg_cache(env, R_CS, seg, 
                           (uint8_t *)(seg << 4), 0xffff, 0);
    cpu_x86_load_seg_cache(env, R_SS, seg, 
                           (uint8_t *)(seg << 4), 0xffff, 0);
    cpu_x86_load_seg_cache(env, R_DS, seg, 
                           (uint8_t *)(seg << 4), 0xffff, 0);
    cpu_x86_load_seg_cache(env, R_ES, seg, 
                           (uint8_t *)(seg << 4), 0xffff, 0);
    cpu_x86_load_seg_cache(env, R_FS, seg, 
                           (uint8_t *)(seg << 4), 0xffff, 0);
    cpu_x86_load_seg_cache(env, R_GS, seg, 
                           (uint8_t *)(seg << 4), 0xffff, 0);

    /* exception support */
    env->idt.base = (void *)idt_table;
    env->idt.limit = sizeof(idt_table) - 1;
    set_idt(0, 0);
    set_idt(1, 0);
    set_idt(2, 0);
    set_idt(3, 3);
    set_idt(4, 3);
    set_idt(5, 3);
    set_idt(6, 0);
    set_idt(7, 0);
    set_idt(8, 0);
    set_idt(9, 0);
    set_idt(10, 0);
    set_idt(11, 0);
    set_idt(12, 0);
    set_idt(13, 0);
    set_idt(14, 0);
    set_idt(15, 0);
    set_idt(16, 0);
    set_idt(17, 0);
    set_idt(18, 0);
    set_idt(19, 0);
        
    /* put return code */
    *seg_to_linear(env->segs[R_CS].selector, 0) = 0xb4; /* mov ah, $0 */
    *seg_to_linear(env->segs[R_CS].selector, 1) = 0x00;
    *seg_to_linear(env->segs[R_CS].selector, 2) = 0xcd; /* int $0x21 */
    *seg_to_linear(env->segs[R_CS].selector, 3) = 0x21;
    pushw(env, 0x0000);

    /* the value of these registers seem to be assumed by pi_10.com */
    env->regs[R_ESI] = 0x100;
    env->regs[R_ECX] = 0xff;
    env->regs[R_EBP] = 0x0900;
    env->regs[R_EDI] = 0xfffe;

    /* inform the emulator of the mmaped memory */
    page_set_flags(0x00000000, 0x110000, 
                   PAGE_WRITE | PAGE_READ | PAGE_EXEC | PAGE_VALID);

    for(;;) {
        ret = cpu_x86_exec(env);
        switch(ret) {
        case EXCP0D_GPF:
            {
                int int_num, ah;
                int_num = *(env->segs[R_CS].base + env->eip + 1);
                if (int_num != 0x21)
                    goto unknown_int;
                ah = (env->regs[R_EAX] >> 8) & 0xff;
                switch(ah) {
                case 0x00: /* exit */
                    exit(0);
                case 0x02: /* write char */
                    {
                        uint8_t c = env->regs[R_EDX];
                        write(1, &c, 1);
                    }
                    break;
                case 0x09: /* write string */
                    {
                        uint8_t c;
                        for(;;) {
                            c = *seg_to_linear(env->segs[R_DS].selector, env->regs[R_EAX]);
                            if (c == '$')
                                break;
                            write(1, &c, 1);
                        }
                        env->regs[R_EAX] = (env->regs[R_EAX] & ~0xff) | '$';
                    }
                    break;
                default:
                unknown_int:
                    fprintf(stderr, "unsupported int 0x%02x\n", int_num);
                    cpu_dump_state(env, stderr, 0);
                    //                    exit(1);
                }
                env->eip += 2;
            }
            break;
        default:
            fprintf(stderr, "unhandled cpu_exec return code (0x%x)\n", ret);
            cpu_dump_state(env, stderr, 0);
            exit(1);
        }
    }
}
Commit	Line	Data
039d3da3 FB	1	/*
	2	* Example of use of user mode libqemu: launch a basic .com DOS
	3	* executable
	4	*/
	5	#include <stdlib.h>
	6	#include <stdio.h>
	7	#include <string.h>
	8	#include <inttypes.h>
	9	#include <unistd.h>
	10	#include <fcntl.h>
	11	#include <sys/mman.h>
	12	#include <signal.h>
	13
	14	#include "cpu.h"
	15
	16	//#define SIGTEST
	17
	18	CPUState *cpu_single_env = NULL;
	19
	20	void cpu_outb(CPUState *env, int addr, int val)
	21	{
	22	fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
	23	}
	24
	25	void cpu_outw(CPUState *env, int addr, int val)
	26	{
	27	fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
	28	}
	29
	30	void cpu_outl(CPUState *env, int addr, int val)
	31	{
	32	fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
	33	}
	34
	35	int cpu_inb(CPUState *env, int addr)
	36	{
	37	fprintf(stderr, "inb: port=0x%04x\n", addr);
	38	return 0;
	39	}
	40
	41	int cpu_inw(CPUState *env, int addr)
	42	{
	43	fprintf(stderr, "inw: port=0x%04x\n", addr);
	44	return 0;
	45	}
	46
	47	int cpu_inl(CPUState *env, int addr)
	48	{
	49	fprintf(stderr, "inl: port=0x%04x\n", addr);
	50	return 0;
	51	}
	52
	53	int cpu_get_pic_interrupt(CPUState *env)
	54	{
	55	return -1;
	56	}
	57
28ab0e2e FB	58	uint64_t cpu_get_tsc(CPUState *env)
	59	{
	60	return 0;
	61	}
	62
039d3da3 FB	63	static void set_gate(void *ptr, unsigned int type, unsigned int dpl,
	64	unsigned long addr, unsigned int sel)
	65	{
	66	unsigned int e1, e2;
	67	e1 = (addr & 0xffff) \| (sel << 16);
	68	e2 = (addr & 0xffff0000) \| 0x8000 \| (dpl << 13) \| (type << 8);
	69	stl((uint8_t *)ptr, e1);
	70	stl((uint8_t *)ptr + 4, e2);
	71	}
	72
	73	uint64_t idt_table[256];
	74
	75	/* only dpl matters as we do only user space emulation */
	76	static void set_idt(int n, unsigned int dpl)
	77	{
	78	set_gate(idt_table + n, 0, dpl, 0, 0);
	79	}
	80
	81	void qemu_free(void *ptr)
	82	{
	83	free(ptr);
	84	}
	85
	86	void *qemu_malloc(size_t size)
	87	{
	88	return malloc(size);
	89	}
	90
	91	void qemu_printf(const char *fmt, ...)
	92	{
	93	va_list ap;
	94	va_start(ap, fmt);
	95	vprintf(fmt, ap);
	96	va_end(ap);
	97	}
	98
	99	/* XXX: this is a bug in helper2.c */
	100	int errno;
	101
	102	/**********************************************/
	103
	104	#define COM_BASE_ADDR 0x10100
	105
	106	void usage(void)
	107	{
	108	printf("qruncom version 0.1 (c) 2003 Fabrice Bellard\n"
	109	"usage: qruncom file.com\n"
	110	"user mode libqemu demo: run simple .com DOS executables\n");
	111	exit(1);
	112	}
	113
	114	static inline uint8_t *seg_to_linear(unsigned int seg, unsigned int reg)
	115	{
	116	return (uint8_t *)((seg << 4) + (reg & 0xffff));
	117	}
	118
	119	static inline void pushw(CPUState *env, int val)
	120	{
	121	env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) \| ((env->regs[R_ESP] - 2) & 0xffff);
	122	(uint16_t )seg_to_linear(env->segs[R_SS].selector, env->regs[R_ESP]) = val;
	123	}
	124
	125	static void host_segv_handler(int host_signum, siginfo_t *info,
	126	void *puc)
127	{
128	if (cpu_signal_handler(host_signum, info, puc)) {
129	return;
130	}
131	abort();
132	}
133
134	int main(int argc, char **argv)
135	{
136	uint8_t *vm86_mem;
137	const char *filename;
138	int fd, ret, seg;
139	CPUState *env;
140
141	if (argc != 2)
142	usage();
143	filename = argv[1];
144
145	vm86_mem = mmap((void *)0x00000000, 0x110000,
146	PROT_WRITE \| PROT_READ \| PROT_EXEC,
147	MAP_FIXED \| MAP_ANON \| MAP_PRIVATE, -1, 0);
148	if (vm86_mem == MAP_FAILED) {
149	perror("mmap");
150	exit(1);
151	}
152
153	/* load the MSDOS .com executable */
154	fd = open(filename, O_RDONLY);
155	if (fd < 0) {
156	perror(filename);
157	exit(1);
158	}
159	ret = read(fd, vm86_mem + COM_BASE_ADDR, 65536 - 256);
160	if (ret < 0) {
161	perror("read");
162	exit(1);
163	}
164	close(fd);
165
166	/* install exception handler for CPU emulator */
167	{
168	struct sigaction act;
169
170	sigfillset(&act.sa_mask);
171	act.sa_flags = SA_SIGINFO;
172	// act.sa_flags \|= SA_ONSTACK;
173
174	act.sa_sigaction = host_segv_handler;
175	sigaction(SIGSEGV, &act, NULL);
176	sigaction(SIGBUS, &act, NULL);
177	#if defined (TARGET_I386) && defined(USE_CODE_COPY)
178	sigaction(SIGFPE, &act, NULL);
179	#endif
180	}
181
182	// cpu_set_log(CPU_LOG_TB_IN_ASM \| CPU_LOG_TB_OUT_ASM \| CPU_LOG_EXEC);
183
184	env = cpu_init();
185
186	/* disable code copy to simplify debugging */
187	code_copy_enabled = 0;
188
189	/* set user mode state (XXX: should be done automatically by
190	cpu_init ?) */
191	env->user_mode_only = 1;
192
193	cpu_x86_set_cpl(env, 3);
194
195	env->cr[0] = CR0_PG_MASK \| CR0_WP_MASK \| CR0_PE_MASK;
196	/* NOTE: hflags duplicates some of the virtual CPU state */
197	env->hflags \|= HF_PE_MASK \| VM_MASK;
198
199	/* flags setup : we activate the IRQs by default as in user
200	mode. We also activate the VM86 flag to run DOS code */
201	env->eflags \|= IF_MASK \| VM_MASK;
202
203	/* init basic registers */
204	env->eip = 0x100;
205	env->regs[R_ESP] = 0xfffe;
206	seg = (COM_BASE_ADDR - 0x100) >> 4;
207
208	cpu_x86_load_seg_cache(env, R_CS, seg,
209	(uint8_t *)(seg << 4), 0xffff, 0);
210	cpu_x86_load_seg_cache(env, R_SS, seg,
211	(uint8_t *)(seg << 4), 0xffff, 0);
212	cpu_x86_load_seg_cache(env, R_DS, seg,
213	(uint8_t *)(seg << 4), 0xffff, 0);
214	cpu_x86_load_seg_cache(env, R_ES, seg,
215	(uint8_t *)(seg << 4), 0xffff, 0);
216	cpu_x86_load_seg_cache(env, R_FS, seg,
217	(uint8_t *)(seg << 4), 0xffff, 0);
218	cpu_x86_load_seg_cache(env, R_GS, seg,
219	(uint8_t *)(seg << 4), 0xffff, 0);
220
221	/* exception support */
222	env->idt.base = (void *)idt_table;
223	env->idt.limit = sizeof(idt_table) - 1;
224	set_idt(0, 0);
225	set_idt(1, 0);
226	set_idt(2, 0);
227	set_idt(3, 3);
228	set_idt(4, 3);
229	set_idt(5, 3);
230	set_idt(6, 0);
231	set_idt(7, 0);
232	set_idt(8, 0);
233	set_idt(9, 0);
234	set_idt(10, 0);
235	set_idt(11, 0);
236	set_idt(12, 0);
237	set_idt(13, 0);
238	set_idt(14, 0);
239	set_idt(15, 0);
240	set_idt(16, 0);
241	set_idt(17, 0);
242	set_idt(18, 0);
243	set_idt(19, 0);
244
245	/* put return code */
246	seg_to_linear(env->segs[R_CS].selector, 0) = 0xb4; / mov ah, $0 */
247	*seg_to_linear(env->segs[R_CS].selector, 1) = 0x00;
248	seg_to_linear(env->segs[R_CS].selector, 2) = 0xcd; / int $0x21 */
249	*seg_to_linear(env->segs[R_CS].selector, 3) = 0x21;
250	pushw(env, 0x0000);
251
252	/* the value of these registers seem to be assumed by pi_10.com */
253	env->regs[R_ESI] = 0x100;
254	env->regs[R_ECX] = 0xff;
255	env->regs[R_EBP] = 0x0900;
256	env->regs[R_EDI] = 0xfffe;
257
258	/* inform the emulator of the mmaped memory */
259	page_set_flags(0x00000000, 0x110000,
260	PAGE_WRITE \| PAGE_READ \| PAGE_EXEC \| PAGE_VALID);
261
262	for(;;) {
263	ret = cpu_x86_exec(env);
264	switch(ret) {
265	case EXCP0D_GPF:
266	{
267	int int_num, ah;
268	int_num = *(env->segs[R_CS].base + env->eip + 1);
269	if (int_num != 0x21)
270	goto unknown_int;
271	ah = (env->regs[R_EAX] >> 8) & 0xff;
272	switch(ah) {
273	case 0x00: /* exit */
274	exit(0);
275	case 0x02: /* write char */
276	{
277	uint8_t c = env->regs[R_EDX];
278	write(1, &c, 1);
279	}
280	break;
281	case 0x09: /* write string */
282	{
283	uint8_t c;
284	for(;;) {
285	c = *seg_to_linear(env->segs[R_DS].selector, env->regs[R_EAX]);
286	if (c == '$')
287	break;
288	write(1, &c, 1);
289	}
290	env->regs[R_EAX] = (env->regs[R_EAX] & ~0xff) \| '$';
291	}
292	break;
293	default:
294	unknown_int:
295	fprintf(stderr, "unsupported int 0x%02x\n", int_num);
296	cpu_dump_state(env, stderr, 0);
297	// exit(1);
298	}
299	env->eip += 2;
300	}
301	break;
302	default:
303	fprintf(stderr, "unhandled cpu_exec return code (0x%x)\n", ret);
304	cpu_dump_state(env, stderr, 0);
305	exit(1);
306	}
307	}
308	}