diff options
Diffstat (limited to 'tests/runcom.c')
| -rw-r--r-- | tests/runcom.c | 192 |
1 files changed, 0 insertions, 192 deletions
diff --git a/tests/runcom.c b/tests/runcom.c deleted file mode 100644 index d60342bfc6..0000000000 --- a/tests/runcom.c +++ /dev/null @@ -1,192 +0,0 @@ -/* - * Simple example of use of vm86: 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 <linux/unistd.h> -#include <asm/vm86.h> - -extern int vm86 (unsigned long int subfunction, - struct vm86plus_struct *info); - -#define VIF_MASK 0x00080000 - -//#define SIGTEST - -#define COM_BASE_ADDR 0x10100 - -static void usage(void) -{ - printf("runcom version 0.1 (c) 2003 Fabrice Bellard\n" - "usage: runcom file.com\n" - "VM86 Run simple .com DOS executables (linux vm86 test mode)\n"); - exit(1); -} - -static inline void set_bit(uint8_t *a, unsigned int bit) -{ - a[bit / 8] |= (1 << (bit % 8)); -} - -static inline uint8_t *seg_to_linear(unsigned int seg, unsigned int reg) -{ - return (uint8_t *)((seg << 4) + (reg & 0xffff)); -} - -static inline void pushw(struct vm86_regs *r, int val) -{ - r->esp = (r->esp & ~0xffff) | ((r->esp - 2) & 0xffff); - *(uint16_t *)seg_to_linear(r->ss, r->esp) = val; -} - -void dump_regs(struct vm86_regs *r) -{ - fprintf(stderr, - "EAX=%08lx EBX=%08lx ECX=%08lx EDX=%08lx\n" - "ESI=%08lx EDI=%08lx EBP=%08lx ESP=%08lx\n" - "EIP=%08lx EFL=%08lx\n" - "CS=%04x DS=%04x ES=%04x SS=%04x FS=%04x GS=%04x\n", - r->eax, r->ebx, r->ecx, r->edx, r->esi, r->edi, r->ebp, r->esp, - r->eip, r->eflags, - r->cs, r->ds, r->es, r->ss, r->fs, r->gs); -} - -#ifdef SIGTEST -void alarm_handler(int sig) -{ - fprintf(stderr, "alarm signal=%d\n", sig); - alarm(1); -} -#endif - -int main(int argc, char **argv) -{ - uint8_t *vm86_mem; - const char *filename; - int fd, ret, seg; - struct vm86plus_struct ctx; - struct vm86_regs *r; - - 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); - } -#ifdef SIGTEST - { - struct sigaction act; - - act.sa_handler = alarm_handler; - sigemptyset(&act.sa_mask); - act.sa_flags = 0; - sigaction(SIGALRM, &act, NULL); - alarm(1); - } -#endif - - /* 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); - - memset(&ctx, 0, sizeof(ctx)); - /* init basic registers */ - r = &ctx.regs; - r->eip = 0x100; - r->esp = 0xfffe; - seg = (COM_BASE_ADDR - 0x100) >> 4; - r->cs = seg; - r->ss = seg; - r->ds = seg; - r->es = seg; - r->fs = seg; - r->gs = seg; - r->eflags = VIF_MASK; - - /* put return code */ - set_bit((uint8_t *)&ctx.int_revectored, 0x21); - *seg_to_linear(r->cs, 0) = 0xb4; /* mov ah, $0 */ - *seg_to_linear(r->cs, 1) = 0x00; - *seg_to_linear(r->cs, 2) = 0xcd; /* int $0x21 */ - *seg_to_linear(r->cs, 3) = 0x21; - pushw(&ctx.regs, 0x0000); - - /* the value of these registers seem to be assumed by pi_10.com */ - r->esi = 0x100; - r->ecx = 0xff; - r->ebp = 0x0900; - r->edi = 0xfffe; - - for(;;) { - ret = vm86(VM86_ENTER, &ctx); - switch(VM86_TYPE(ret)) { - case VM86_INTx: - { - int int_num, ah; - - int_num = VM86_ARG(ret); - if (int_num != 0x21) - goto unknown_int; - ah = (r->eax >> 8) & 0xff; - switch(ah) { - case 0x00: /* exit */ - exit(0); - case 0x02: /* write char */ - { - uint8_t c = r->edx; - write(1, &c, 1); - } - break; - case 0x09: /* write string */ - { - uint8_t c; - for(;;) { - c = *seg_to_linear(r->ds, r->edx); - if (c == '$') - break; - write(1, &c, 1); - } - r->eax = (r->eax & ~0xff) | '$'; - } - break; - default: - unknown_int: - fprintf(stderr, "unsupported int 0x%02x\n", int_num); - dump_regs(&ctx.regs); - // exit(1); - } - } - break; - case VM86_SIGNAL: - /* a signal came, we just ignore that */ - break; - case VM86_STI: - break; - default: - fprintf(stderr, "unhandled vm86 return code (0x%x)\n", ret); - dump_regs(&ctx.regs); - exit(1); - } - } -} |