-/* vm86 emulation */
-
-#define SAFE_MASK (0xDD5)
-
-int do_vm86(CPUX86State *env, long subfunction,
- struct target_vm86plus_struct * target_v86)
-{
- TaskState *ts = env->opaque;
- int ret;
-
- switch (subfunction) {
- case TARGET_VM86_REQUEST_IRQ:
- case TARGET_VM86_FREE_IRQ:
- case TARGET_VM86_GET_IRQ_BITS:
- case TARGET_VM86_GET_AND_RESET_IRQ:
- gemu_log("qemu: unsupported vm86 subfunction (%ld)\n", subfunction);
- ret = -EINVAL;
- goto out;
- case TARGET_VM86_PLUS_INSTALL_CHECK:
- /* NOTE: on old vm86 stuff this will return the error
- from verify_area(), because the subfunction is
- interpreted as (invalid) address to vm86_struct.
- So the installation check works.
- */
- ret = 0;
- goto out;
- }
-
- ts->target_v86 = target_v86;
- /* save current CPU regs */
- ts->vm86_saved_regs.eax = 0; /* default vm86 syscall return code */
- ts->vm86_saved_regs.ebx = env->regs[R_EBX];
- ts->vm86_saved_regs.ecx = env->regs[R_ECX];
- ts->vm86_saved_regs.edx = env->regs[R_EDX];
- ts->vm86_saved_regs.esi = env->regs[R_ESI];
- ts->vm86_saved_regs.edi = env->regs[R_EDI];
- ts->vm86_saved_regs.ebp = env->regs[R_EBP];
- ts->vm86_saved_regs.esp = env->regs[R_ESP];
- ts->vm86_saved_regs.eflags = env->eflags;
- ts->vm86_saved_regs.eip = env->eip;
- ts->vm86_saved_regs.cs = env->segs[R_CS];
- ts->vm86_saved_regs.ss = env->segs[R_SS];
- ts->vm86_saved_regs.ds = env->segs[R_DS];
- ts->vm86_saved_regs.es = env->segs[R_ES];
- ts->vm86_saved_regs.fs = env->segs[R_FS];
- ts->vm86_saved_regs.gs = env->segs[R_GS];
-
- /* build vm86 CPU state */
- env->eflags = (env->eflags & ~SAFE_MASK) |
- (tswap32(target_v86->regs.eflags) & SAFE_MASK) | VM_MASK;
-
- env->regs[R_EBX] = tswap32(target_v86->regs.ebx);
- env->regs[R_ECX] = tswap32(target_v86->regs.ecx);
- env->regs[R_EDX] = tswap32(target_v86->regs.edx);
- env->regs[R_ESI] = tswap32(target_v86->regs.esi);
- env->regs[R_EDI] = tswap32(target_v86->regs.edi);
- env->regs[R_EBP] = tswap32(target_v86->regs.ebp);
- env->regs[R_ESP] = tswap32(target_v86->regs.esp);
- env->eip = tswap32(target_v86->regs.eip);
- cpu_x86_load_seg(env, R_CS, tswap16(target_v86->regs.cs));
- cpu_x86_load_seg(env, R_SS, tswap16(target_v86->regs.ss));
- cpu_x86_load_seg(env, R_DS, tswap16(target_v86->regs.ds));
- cpu_x86_load_seg(env, R_ES, tswap16(target_v86->regs.es));
- cpu_x86_load_seg(env, R_FS, tswap16(target_v86->regs.fs));
- cpu_x86_load_seg(env, R_GS, tswap16(target_v86->regs.gs));
- ret = tswap32(target_v86->regs.eax); /* eax will be restored at
- the end of the syscall */
- /* now the virtual CPU is ready for vm86 execution ! */
- out:
- return ret;
-}