gwj / at91sam9263 · Commits

Commit 62296fe3510d1f72b219223c36f11f3a4cf23107

Authored by bellard
1 parent 32f36bce

added runcom test 


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@71 c046a42c-6fe2-441c-8c8c-71466251a162
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Showing 1 changed file with 188 additions and 0 deletions
tests/runcom.c 0 → 100644
  View file @62296fe
  1 +/*
  2 + * Simple example of use of vm86: launch a basic .com DOS executable
  3 + */
  4 +#include <stdlib.h>
  5 +#include <stdio.h>
  6 +#include <inttypes.h>
  7 +#include <unistd.h>
  8 +#include <fcntl.h>
  9 +#include <sys/mman.h>
  10 +#include <signal.h>
  11 +
  12 +#include <linux/unistd.h>
  13 +#include <asm/vm86.h>
  14 +
  15 +//#define SIGTEST
  16 +
  17 +_syscall2(int, vm86, int, func, struct vm86plus_struct *, v86)
  18 +
  19 +#define COM_BASE_ADDR 0x10100
  20 +
  21 +void usage(void)
  22 +{
  23 + printf("runcom version 0.1 (c) 2003 Fabrice Bellard\n"
  24 + "usage: runcom file.com\n"
  25 + "VM86 Run simple .com DOS executables (linux vm86 test mode)\n");
  26 + exit(1);
  27 +}
  28 +
  29 +static inline void set_bit(uint8_t *a, unsigned int bit)
  30 +{
  31 + a[bit / 8] |= (1 << (bit % 8));
  32 +}
  33 +
  34 +static inline uint8_t *seg_to_linear(unsigned int seg, unsigned int reg)
  35 +{
  36 + return (uint8_t *)((seg << 4) + (reg & 0xffff));
  37 +}
  38 +
  39 +static inline void pushw(struct vm86_regs *r, int val)
  40 +{
  41 + r->esp = (r->esp & ~0xffff) | ((r->esp - 2) & 0xffff);
  42 + *(uint16_t *)seg_to_linear(r->ss, r->esp) = val;
  43 +}
  44 +
  45 +void dump_regs(struct vm86_regs *r)
  46 +{
  47 + fprintf(stderr,
  48 + "EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n"
  49 + "ESI=%08lx EDI=%08lx EBP=%08lx ESP=%08lx\n"
  50 + "EIP=%08lx EFL=%08lx\n"
  51 + "CS=%04x DS=%04x ES=%04x SS=%04x FS=%04x GS=%04x\n",
  52 + r->eax, r->ebx, r->ecx, r->edx, r->esi, r->edi, r->ebp, r->esp,
  53 + r->eip, r->eflags,
  54 + r->cs, r->ds, r->es, r->ss, r->fs, r->gs);
  55 +}
  56 +
  57 +#ifdef SIGTEST
  58 +void alarm_handler(int sig)
  59 +{
  60 + fprintf(stderr, "alarm signal=%d\n", sig);
  61 + alarm(1);
  62 +}
  63 +#endif
  64 +
  65 +int main(int argc, char **argv)
  66 +{
  67 + uint8_t *vm86_mem;
  68 + const char *filename;
  69 + int fd, ret, seg;
  70 + struct vm86plus_struct ctx;
  71 + struct vm86_regs *r;
  72 +
  73 + if (argc != 2)
  74 + usage();
  75 + filename = argv[1];
  76 +
  77 + vm86_mem = mmap((void *)0x00000000, 0x110000,
  78 + PROT_WRITE | PROT_READ | PROT_EXEC,
  79 + MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0);
  80 + if (vm86_mem == MAP_FAILED) {
  81 + perror("mmap");
  82 + exit(1);
  83 + }
  84 +#ifdef SIGTEST
  85 + {
  86 + struct sigaction act;
  87 +
  88 + act.sa_handler = alarm_handler;
  89 + sigemptyset(&act.sa_mask);
  90 + act.sa_flags = 0;
  91 + sigaction(SIGALRM, &act, NULL);
  92 + alarm(1);
  93 + }
  94 +#endif
  95 +
  96 + /* load the MSDOS .com executable */
  97 + fd = open(filename, O_RDONLY);
  98 + if (fd < 0) {
  99 + perror(filename);
  100 + exit(1);
  101 + }
  102 + ret = read(fd, vm86_mem + COM_BASE_ADDR, 65536 - 256);
  103 + if (ret < 0) {
  104 + perror("read");
  105 + exit(1);
  106 + }
  107 + close(fd);
  108 +
  109 + memset(&ctx, 0, sizeof(ctx));
  110 + /* init basic registers */
  111 + r = &ctx.regs;
  112 + r->eip = 0x100;
  113 + r->esp = 0xfffe;
  114 + seg = (COM_BASE_ADDR - 0x100) >> 4;
  115 + r->cs = seg;
  116 + r->ss = seg;
  117 + r->ds = seg;
  118 + r->es = seg;
  119 + r->fs = seg;
  120 + r->gs = seg;
  121 + r->eflags = (IF_MASK | IOPL_MASK);
  122 +
  123 + /* put return code */
  124 + set_bit((uint8_t *)&ctx.int_revectored, 0x21);
  125 + *seg_to_linear(r->cs, 0) = 0xb4; /* mov ah, $0 */
  126 + *seg_to_linear(r->cs, 1) = 0x00;
  127 + *seg_to_linear(r->cs, 2) = 0xcd; /* int $0x21 */
  128 + *seg_to_linear(r->cs, 3) = 0x21;
  129 + pushw(&ctx.regs, 0x0000);
  130 +
  131 + /* the value of these registers seem to be assumed by pi_10.com */
  132 + r->esi = 0x100;
  133 + r->ecx = 0xff;
  134 + r->ebp = 0x0900;
  135 + r->edi = 0xfffe;
  136 +
  137 + for(;;) {
  138 + ret = vm86(VM86_ENTER, &ctx);
  139 + switch(VM86_TYPE(ret)) {
  140 + case VM86_INTx:
  141 + {
  142 + int int_num, ah;
  143 +
  144 + int_num = VM86_ARG(ret);
  145 + if (int_num != 0x21)
  146 + goto unknown_int;
  147 + ah = (r->eax >> 8) & 0xff;
  148 + switch(ah) {
  149 + case 0x00: /* exit */
  150 + exit(0);
  151 + case 0x02: /* write char */
  152 + {
  153 + uint8_t c = r->edx;
  154 + write(1, &c, 1);
  155 + }
  156 + break;
  157 + case 0x09: /* write string */
  158 + {
  159 + uint8_t c;
  160 + for(;;) {
  161 + c = *seg_to_linear(r->ds, r->edx);
  162 + if (c == '$')
  163 + break;
  164 + write(1, &c, 1);
  165 + }
  166 + r->eax = (r->eax & ~0xff) | '$';
  167 + }
  168 + break;
  169 + default:
  170 + unknown_int:
  171 + fprintf(stderr, "unsupported int 0x%02x\n", int_num);
  172 + dump_regs(&ctx.regs);
  173 + // exit(1);
  174 + }
  175 + }
  176 + break;
  177 + case VM86_SIGNAL:
  178 + /* a signal came, we just ignore that */
  179 + break;
  180 + case VM86_STI:
  181 + break;
  182 + default:
  183 + fprintf(stderr, "unhandled vm86 return code (0x%x)\n", ret);
  184 + dump_regs(&ctx.regs);
  185 + exit(1);
  186 + }
  187 + }
  188 +}
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