gwj / at91sam9263 · Commits

Commit 039d3da3653a76cc00c67be273799c4f0b007f88

Authored by bellard
1 parent a7e61ed4

added user mode libqemu usage example 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@739 c046a42c-6fe2-441c-8c8c-71466251a162
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tests/Makefile
  View file @039d3da
... ... @@ -62,6 +62,11 @@ speed: sha1 sha1-i386
62 62 runcom: runcom.c
63 63 $(CC) $(CFLAGS) $(LDFLAGS) -o $@ $<
64 64  
  65 +# NOTE: -fomit-frame-pointer is currently needed : this is a bug in libqemu
  66 +qruncom: qruncom.c ../i386-user/libqemu.a
  67 + $(CC) $(CFLAGS) -fomit-frame-pointer $(LDFLAGS) -I../target-i386 -I.. -I../i386-user \
  68 + -o $@ $< -L../i386-user -lqemu -lm
  69 +
65 70 # arm test
66 71 hello-arm: hello-arm.o
67 72 arm-linux-ld -o $@ $<
... ...
tests/pi_10.com 0 → 100644
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tests/qruncom.c 0 → 100644
  View file @039d3da
  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 +}
... ...