/* * Example of use of user mode libqemu: launch a basic .com DOS * executable */ #include #include #include #include #include #include #include #include #include #include "cpu.h" //#define SIGTEST 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; } uint64_t cpu_get_tsc(CPUState *env) { return 0; } 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_mallocz(size_t size) { void *ptr; ptr = qemu_malloc(size); if (!ptr) return NULL; memset(ptr, 0, size); return ptr; } void *qemu_vmalloc(size_t size) { return memalign(4096, size); } void qemu_vfree(void *ptr) { free(ptr); } 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 | PRO

OBJS += backends/json/json.o