/* putword - put a word into the data array */ int putword(int n,int w) { return (putdword(base+n,w)); }
/* * Handle a GP fault that occurred while in VM86 mode. Things that are easy * to handle here are done here (much more efficient than trapping to 32-bit * handler code and then having it restart VM86 mode). */ void vm86_gpfault(struct proc *p, int type) { struct trapframe *tf = p->p_md.md_regs; union sigval sv; /* * we want to fetch some stuff from the current user virtual * address space for checking. remember that the frame's * segment selectors are real-mode style selectors. */ u_long cs, ip, ss, sp; u_char tmpbyte; int trace; cs = CS(tf) << 4; ip = IP(tf); ss = SS(tf) << 4; sp = SP(tf); trace = tf->tf_eflags & PSL_T; /* * For most of these, we must set all the registers before calling * macros/functions which might do a vm86_return. */ tmpbyte = getbyte(cs, ip); IP(tf) = ip; switch (tmpbyte) { case CLI: /* simulate handling of IF */ clr_vif(p); break; case STI: /* simulate handling of IF. * XXX the i386 enables interrupts one instruction later. * code here is wrong, but much simpler than doing it Right. */ set_vif(p); break; case INTxx: /* try fast intxx, or return to 32bit mode to handle it. */ tmpbyte = getbyte(cs, ip); IP(tf) = ip; fast_intxx(p, tmpbyte); break; case INTO: if (tf->tf_eflags & PSL_V) fast_intxx(p, 4); break; case PUSHF: putword(ss, sp, get_vflags_short(p)); SP(tf) = sp; break; case IRET: IP(tf) = getword(ss, sp); CS(tf) = getword(ss, sp); case POPF: set_vflags_short(p, getword(ss, sp)); SP(tf) = sp; break; case OPSIZ: tmpbyte = getbyte(cs, ip); IP(tf) = ip; switch (tmpbyte) { case PUSHF: putdword(ss, sp, get_vflags(p) & ~PSL_VM); SP(tf) = sp; break; case IRET: IP(tf) = getdword(ss, sp); CS(tf) = getdword(ss, sp); case POPF: set_vflags(p, getdword(ss, sp) | PSL_VM); SP(tf) = sp; break; default: IP(tf) -= 2; goto bad; } break; case LOCK: default: IP(tf) -= 1; goto bad; } if (trace && tf->tf_eflags & PSL_VM) { sv.sival_int = 0; trapsignal(p, SIGTRAP, T_TRCTRAP, TRAP_TRACE, sv); } return; bad: vm86_return(p, VM86_UNKNOWN); return; }
/* setvalue - set the value of a variable in the variable table */ int setvalue(int n, int v) { if (n < 1 || n > vcount) nerror("variable number out of range: %d",n); return (putdword(vtable+n+n,v)); }