Revision 039d3da3

b/tests/Makefile
62 62
runcom: runcom.c
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	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<
64 64

  
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# NOTE: -fomit-frame-pointer is currently needed : this is a bug in libqemu
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qruncom: qruncom.c ../i386-user/libqemu.a
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	$(CC) $(CFLAGS) -fomit-frame-pointer $(LDFLAGS) -I../target-i386 -I.. -I../i386-user \
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              -o $@ $< -L../i386-user -lqemu -lm
69

  
65 70
# arm test
66 71
hello-arm: hello-arm.o
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	arm-linux-ld -o $@ $<
b/tests/qruncom.c
1
/*
2
 * Example of use of user mode libqemu: launch a basic .com DOS
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 * executable
4
 */
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <inttypes.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <signal.h>
13

  
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#include "cpu.h"
15

  
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//#define SIGTEST
17

  
18
CPUState *cpu_single_env = NULL;
19

  
20
void cpu_outb(CPUState *env, int addr, int val)
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{
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    fprintf(stderr, "outb: port=0x%04x, data=%02x\n", addr, val);
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}
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void cpu_outw(CPUState *env, int addr, int val)
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{
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    fprintf(stderr, "outw: port=0x%04x, data=%04x\n", addr, val);
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}
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void cpu_outl(CPUState *env, int addr, int val)
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{
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    fprintf(stderr, "outl: port=0x%04x, data=%08x\n", addr, val);
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}
34

  
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int cpu_inb(CPUState *env, int addr)
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{
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    fprintf(stderr, "inb: port=0x%04x\n", addr);
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    return 0;
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}
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int cpu_inw(CPUState *env, int addr)
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{
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    fprintf(stderr, "inw: port=0x%04x\n", addr);
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    return 0;
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}
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int cpu_inl(CPUState *env, int addr)
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{
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    fprintf(stderr, "inl: port=0x%04x\n", addr);
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    return 0;
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}
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int cpu_get_pic_interrupt(CPUState *env)
54
{
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    return -1;
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}
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58
static void set_gate(void *ptr, unsigned int type, unsigned int dpl, 
59
                     unsigned long addr, unsigned int sel)
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{
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    unsigned int e1, e2;
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    e1 = (addr & 0xffff) | (sel << 16);
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    e2 = (addr & 0xffff0000) | 0x8000 | (dpl << 13) | (type << 8);
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    stl((uint8_t *)ptr, e1);
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    stl((uint8_t *)ptr + 4, e2);
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}
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uint64_t idt_table[256];
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/* only dpl matters as we do only user space emulation */
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static void set_idt(int n, unsigned int dpl)
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{
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    set_gate(idt_table + n, 0, dpl, 0, 0);
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}
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void qemu_free(void *ptr)
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{
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    free(ptr);
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}
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void *qemu_malloc(size_t size)
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{
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    return malloc(size);
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}
85

  
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void qemu_printf(const char *fmt, ...)
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{
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    va_list ap;
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    va_start(ap, fmt);
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    vprintf(fmt, ap);
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    va_end(ap);
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}
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/* XXX: this is a bug in helper2.c */
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int errno;
96

  
97
/**********************************************/
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#define COM_BASE_ADDR    0x10100
100

  
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void usage(void)
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{
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    printf("qruncom version 0.1 (c) 2003 Fabrice Bellard\n"
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           "usage: qruncom file.com\n"
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           "user mode libqemu demo: run simple .com DOS executables\n");
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    exit(1);
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}
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static inline uint8_t *seg_to_linear(unsigned int seg, unsigned int reg)
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{
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    return (uint8_t *)((seg << 4) + (reg & 0xffff));
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}
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static inline void pushw(CPUState *env, int val)
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{
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    env->regs[R_ESP] = (env->regs[R_ESP] & ~0xffff) | ((env->regs[R_ESP] - 2) & 0xffff);
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    *(uint16_t *)seg_to_linear(env->segs[R_SS].selector, env->regs[R_ESP]) = val;
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}
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;
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    const char *filename;
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    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, 
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                    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
}

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