[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;
}

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