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Diffstat (limited to 'tests/qruncom.c')
| -rw-r--r-- | tests/qruncom.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/tests/qruncom.c b/tests/qruncom.c new file mode 100644 index 0000000000..491ecbc60e --- /dev/null +++ b/tests/qruncom.c @@ -0,0 +1,303 @@ +/* + * Example of use of user mode libqemu: 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 "cpu.h" + +//#define SIGTEST + +CPUState *cpu_single_env = NULL; + +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; +} + +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_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 | PROT_READ | PROT_EXEC, + MAP_FIXED | MAP_ANON | MAP_PRIVATE, -1, 0); + if (vm86_mem == MAP_FAILED) { + perror("mmap"); + exit(1); + } + + /* 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); + + /* install exception handler for CPU emulator */ + { + struct sigaction act; + + sigfillset(&act.sa_mask); + act.sa_flags = SA_SIGINFO; + // act.sa_flags |= SA_ONSTACK; + + act.sa_sigaction = host_segv_handler; + sigaction(SIGSEGV, &act, NULL); + sigaction(SIGBUS, &act, NULL); +#if defined (TARGET_I386) && defined(USE_CODE_COPY) + sigaction(SIGFPE, &act, NULL); +#endif + } + + // cpu_set_log(CPU_LOG_TB_IN_ASM | CPU_LOG_TB_OUT_ASM | CPU_LOG_EXEC); + + env = cpu_init(); + + /* disable code copy to simplify debugging */ + code_copy_enabled = 0; + + /* set user mode state (XXX: should be done automatically by + cpu_init ?) */ + env->user_mode_only = 1; + + cpu_x86_set_cpl(env, 3); + + env->cr[0] = CR0_PG_MASK | CR0_WP_MASK | CR0_PE_MASK; + /* NOTE: hflags duplicates some of the virtual CPU state */ + env->hflags |= HF_PE_MASK | VM_MASK; + + /* flags setup : we activate the IRQs by default as in user + mode. We also activate the VM86 flag to run DOS code */ + env->eflags |= IF_MASK | VM_MASK; + + /* init basic registers */ + env->eip = 0x100; + env->regs[R_ESP] = 0xfffe; + seg = (COM_BASE_ADDR - 0x100) >> 4; + + cpu_x86_load_seg_cache(env, R_CS, seg, + (uint8_t *)(seg << 4), 0xffff, 0); + cpu_x86_load_seg_cache(env, R_SS, seg, + (uint8_t *)(seg << 4), 0xffff, 0); + cpu_x86_load_seg_cache(env, R_DS, seg, + (uint8_t *)(seg << 4), 0xffff, 0); + cpu_x86_load_seg_cache(env, R_ES, seg, + (uint8_t *)(seg << 4), 0xffff, 0); + cpu_x86_load_seg_cache(env, R_FS, seg, + (uint8_t *)(seg << 4), 0xffff, 0); + cpu_x86_load_seg_cache(env, R_GS, seg, + (uint8_t *)(seg << 4), 0xffff, 0); + + /* exception support */ + env->idt.base = (void *)idt_table; + env->idt.limit = sizeof(idt_table) - 1; + set_idt(0, 0); + set_idt(1, 0); + set_idt(2, 0); + set_idt(3, 3); + set_idt(4, 3); + set_idt(5, 3); + set_idt(6, 0); + set_idt(7, 0); + set_idt(8, 0); + set_idt(9, 0); + set_idt(10, 0); + set_idt(11, 0); + set_idt(12, 0); + set_idt(13, 0); + set_idt(14, 0); + set_idt(15, 0); + set_idt(16, 0); + set_idt(17, 0); + set_idt(18, 0); + set_idt(19, 0); + + /* put return code */ + *seg_to_linear(env->segs[R_CS].selector, 0) = 0xb4; /* mov ah, $0 */ + *seg_to_linear(env->segs[R_CS].selector, 1) = 0x00; + *seg_to_linear(env->segs[R_CS].selector, 2) = 0xcd; /* int $0x21 */ + *seg_to_linear(env->segs[R_CS].selector, 3) = 0x21; + pushw(env, 0x0000); + + /* the value of these registers seem to be assumed by pi_10.com */ + env->regs[R_ESI] = 0x100; + env->regs[R_ECX] = 0xff; + env->regs[R_EBP] = 0x0900; + env->regs[R_EDI] = 0xfffe; + + /* inform the emulator of the mmaped memory */ + page_set_flags(0x00000000, 0x110000, + PAGE_WRITE | PAGE_READ | PAGE_EXEC | PAGE_VALID); + + for(;;) { + ret = cpu_x86_exec(env); + switch(ret) { + case EXCP0D_GPF: + { + int int_num, ah; + int_num = *(env->segs[R_CS].base + env->eip + 1); + if (int_num != 0x21) + goto unknown_int; + ah = (env->regs[R_EAX] >> 8) & 0xff; + switch(ah) { + case 0x00: /* exit */ + exit(0); + case 0x02: /* write char */ + { + uint8_t c = env->regs[R_EDX]; + write(1, &c, 1); + } + break; + case 0x09: /* write string */ + { + uint8_t c; + for(;;) { + c = *seg_to_linear(env->segs[R_DS].selector, env->regs[R_EAX]); + if (c == '$') + break; + write(1, &c, 1); + } + env->regs[R_EAX] = (env->regs[R_EAX] & ~0xff) | '$'; + } + break; + default: + unknown_int: + fprintf(stderr, "unsupported int 0x%02x\n", int_num); + cpu_dump_state(env, stderr, 0); + // exit(1); + } + env->eip += 2; + } + break; + default: + fprintf(stderr, "unhandled cpu_exec return code (0x%x)\n", ret); + cpu_dump_state(env, stderr, 0); + exit(1); + } + } +} |