From dfd1934d5e1ddbeb326f77fc0e52307c801a1a3e Mon Sep 17 00:00:00 2001 From: "Charles.Forsyth" Date: Wed, 25 Mar 2009 15:55:14 +0000 Subject: x20090325-1554 --- emu/FreeBSD/os.c | 513 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 513 insertions(+) create mode 100644 emu/FreeBSD/os.c (limited to 'emu/FreeBSD/os.c') diff --git a/emu/FreeBSD/os.c b/emu/FreeBSD/os.c new file mode 100644 index 00000000..8ef3f1b5 --- /dev/null +++ b/emu/FreeBSD/os.c @@ -0,0 +1,513 @@ +#include "dat.h" +#include "fns.h" +#include "error.h" +#undef getwd +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +enum +{ + DELETE = 0x7F, + NSTACKSPERALLOC = 16, + X11STACK= 256*1024 +}; +char *hosttype = "FreeBSD"; + +extern void unlockandexit(int*); +extern void executeonnewstack(void*, void (*f)(void*), void*); +static void *stackalloc(Proc *p, void **tos); +static void stackfreeandexit(void *stack); + +extern int dflag; + +void +pexit(char *msg, int t) +{ + Osenv *e; + Proc *p; + void *kstack; + + lock(&procs.l); + p = up; + if(p->prev) + p->prev->next = p->next; + else + procs.head = p->next; + + if(up->next) + p->next->prev = p->prev; + else + procs.tail = p->prev; + unlock(&procs.l); + + if(0) + print("pexit: %s: %s\n", up->text, msg); + + e = up->env; + if(e != nil) { + closefgrp(e->fgrp); + closepgrp(e->pgrp); + closeegrp(e->egrp); + closesigs(e->sigs); + } + kstack = p->kstack; + free(p->prog); + free(p); + if(kstack != nil) + stackfreeandexit(kstack); +} + +void +trapBUS(int signo, siginfo_t *info, void *context) +{ + if(info) + print("trapBUS: signo: %d code: %d addr: %lx\n", + info->si_signo, info->si_code, info->si_addr); + else + print("trapBUS: no info\n"); + disfault(nil, "Bus error"); +} + +static void +trapUSR1(int signo) +{ + int intwait; + + USED(signo); + + intwait = up->intwait; + up->intwait = 0; /* clear it to let proc continue in osleave */ + + if(up->type != Interp) /* Used to unblock pending I/O */ + return; + if(intwait == 0) /* Not posted so its a sync error */ + disfault(nil, Eintr); /* Should never happen */ +} + +static void +trapUSR2(int signo) +{ + USED(signo); + /* we've done our work of interrupting sigsuspend */ +} + +static void +trapILL(int signo) +{ + disfault(nil, "Illegal instruction"); +} + +static void +trapSEGV(int signo) +{ + disfault(nil, "Segmentation violation"); +} + +static sigset_t initmask; + +static void +setsigs(void) +{ + struct sigaction act; + sigset_t mask; + + memset(&act, 0 , sizeof(act)); + sigemptyset(&initmask); + + signal(SIGPIPE, SIG_IGN); /* prevent signal when devcmd child exits */ + if(signal(SIGTERM, SIG_IGN) != SIG_IGN) + signal(SIGTERM, cleanexit); + + act.sa_handler = trapUSR1; + act.sa_mask = initmask; + sigaction(SIGUSR1, &act, nil); + + act.sa_handler = trapUSR2; + sigaction(SIGUSR2, &act, nil); + sigemptyset(&mask); + sigaddset(&mask, SIGUSR2); + sigaddset(&initmask, SIGUSR2); + sigprocmask(SIG_BLOCK, &mask, NULL); + + /* + * prevent Zombies forming when any process terminates + */ + act.sa_sigaction = 0; + act.sa_flags |= SA_NOCLDWAIT; + if(sigaction(SIGCHLD, &act, nil)) + panic("sigaction SIGCHLD"); + + if(sflag == 0) { + act.sa_sigaction = trapBUS; + act.sa_flags |= SA_SIGINFO; + if(sigaction(SIGBUS, &act, nil)) + panic("sigaction SIGBUS"); + act.sa_handler = trapILL; + if(sigaction(SIGILL, &act, nil)) + panic("sigaction SIGBUS"); + act.sa_handler = trapSEGV; + if(sigaction(SIGSEGV, &act, nil)) + panic("sigaction SIGSEGV"); + if(sigaddset(&initmask, SIGINT) == -1) + panic("sigaddset"); + } + if(sigprocmask(SIG_BLOCK, &initmask, nil)!= 0) + panic("sigprocmask"); +} + +static int +tramp(void *arg) +{ + Proc *p; + + p = arg; + p->pid = p->sigid = getpid(); + sigprocmask(SIG_BLOCK, &initmask, nil); /* in 5.3, rfork_thread doesn't copy from parent, contrary to docs? */ + (*p->func)(p->arg); + pexit("{Tramp}", 0); + _exit(0); +} + +int +kproc(char *name, void (*func)(void*), void *arg, int flags) +{ + Proc *p; + Pgrp *pg; + Fgrp *fg; + Egrp *eg; + int pid; + void *tos; + + p = newproc(); + + if(flags & KPDUPPG) { + pg = up->env->pgrp; + incref(&pg->r); + p->env->pgrp = pg; + } + if(flags & KPDUPFDG) { + fg = up->env->fgrp; + incref(&fg->r); + p->env->fgrp = fg; + } + if(flags & KPDUPENVG) { + eg = up->env->egrp; + incref(&eg->r); + p->env->egrp = eg; + } + + p->env->uid = up->env->uid; + p->env->gid = up->env->gid; + kstrdup(&p->env->user, up->env->user); + + strcpy(p->text, name); + + p->func = func; + p->arg = arg; + + lock(&procs.l); + if(procs.tail != nil) { + p->prev = procs.tail; + procs.tail->next = p; + } + else { + procs.head = p; + p->prev = nil; + } + procs.tail = p; + unlock(&procs.l); + + if(flags & KPX11){ + p->kstack = nil; /* never freed; also up not defined */ + tos = (char*)mallocz(X11STACK, 0) + X11STACK - sizeof(void*); + }else + p->kstack = stackalloc(p, &tos); + pid = rfork_thread(RFPROC|RFMEM|RFNOWAIT, tos, tramp, p); + if(pid < 0) + panic("ourfork"); + + return pid; + +} + +void +oshostintr(Proc *p) +{ + kill(p->sigid, SIGUSR1); +} + +void +osblock(void) +{ + sigset_t mask; + + sigprocmask(SIG_SETMASK, NULL, &mask); + sigdelset(&mask, SIGUSR2); + sigsuspend(&mask); +} + +void +osready(Proc *p) +{ + if(kill(p->sigid, SIGUSR2) < 0) + fprint(2, "emu: osready failed: pid %d: %s\n", p->sigid, strerror(errno)); +} + +void +oslongjmp(void *regs, osjmpbuf env, int val) +{ + USED(regs); + siglongjmp(env, val); +} + +struct termios tinit; + +static void +termset(void) +{ + struct termios t; + + tcgetattr(0, &t); + tinit = t; + t.c_lflag &= ~(ICANON|ECHO|ISIG); + t.c_cc[VMIN] = 1; + t.c_cc[VTIME] = 0; + tcsetattr(0, TCSANOW, &t); +} + +static void +termrestore(void) +{ + tcsetattr(0, TCSANOW, &tinit); +} + +void +cleanexit(int x) +{ + USED(x); + + if(up->intwait) { + up->intwait = 0; + return; + } + + if(dflag == 0) + termrestore(); + + kill(0, SIGKILL); + exit(0); +} + +void +osreboot(char *file, char **argv) +{ + if(dflag == 0) + termrestore(); + execvp(file, argv); + panic("reboot failure"); +} + +int gidnobody= -1, uidnobody= -1; + +void +getnobody() +{ + struct passwd *pwd; + + if(pwd = getpwnam("nobody")) { + uidnobody = pwd->pw_uid; + gidnobody = pwd->pw_gid; + } +} + +void +libinit(char *imod) +{ + struct passwd *pw; + Proc *p; + void *tos; + char sys[64]; + + setsid(); + + gethostname(sys, sizeof(sys)); + kstrdup(&ossysname, sys); + getnobody(); + + if(dflag == 0) + termset(); + + setsigs(); + + p = newproc(); + p->kstack = stackalloc(p, &tos); + + pw = getpwuid(getuid()); + if(pw != nil) + kstrdup(&eve, pw->pw_name); + else + print("cannot getpwuid\n"); + + p->env->uid = getuid(); + p->env->gid = getgid(); + + executeonnewstack(tos, emuinit, imod); +} + +int +readkbd(void) +{ + int n; + char buf[1]; + + n = read(0, buf, sizeof(buf)); + if(n < 0) + print("keyboard close (n=%d, %s)\n", n, strerror(errno)); + if(n <= 0) + pexit("keyboard thread", 0); + + switch(buf[0]) { + case '\r': + buf[0] = '\n'; + break; + case DELETE: + cleanexit(0); + break; + } + return buf[0]; +} + +/* + * Return an abitrary millisecond clock time + */ +long +osmillisec(void) +{ + static long sec0 = 0, usec0; + struct timeval t; + + if(gettimeofday(&t,(struct timezone*)0)<0) + return 0; + if(sec0==0) { + sec0 = t.tv_sec; + usec0 = t.tv_usec; + } + return (t.tv_sec-sec0)*1000+(t.tv_usec-usec0+500)/1000; +} + +int +limbosleep(ulong milsec) +{ + return osmillisleep(milsec); +} + +/* + * Return the time since the epoch in nanoseconds and microseconds + * The epoch is defined at 1 Jan 1970 + */ +vlong +osnsec(void) +{ + struct timeval t; + + gettimeofday(&t, nil); + return (vlong)t.tv_sec*1000000000L + t.tv_usec*1000; +} + +vlong +osusectime(void) +{ + struct timeval t; + + gettimeofday(&t, nil); + return (vlong)t.tv_sec * 1000000 + t.tv_usec; +} + +int +osmillisleep(ulong milsec) +{ + struct timespec time; + + time.tv_sec = milsec / 1000; + time.tv_nsec = (milsec % 1000) * 1000000; + nanosleep(&time, 0); + return 0; +} + +void +osyield(void) +{ + sched_yield(); +} + +void +ospause(void) +{ + for(;;) + pause(); +} + +void +oslopri(void) +{ + setpriority(PRIO_PROCESS, 0, getpriority(PRIO_PROCESS,0)+4); +} + +static struct { + Lock l; + void *free; +} stacklist; + +static void +_stackfree(void *stack) +{ + *((void **)stack) = stacklist.free; + stacklist.free = stack; +} + +static void +stackfreeandexit(void *stack) +{ + lock(&stacklist.l); + _stackfree(stack); + unlockandexit(&stacklist.l.val); +} + +static void * +stackalloc(Proc *p, void **tos) +{ + void *rv; + lock(&stacklist.l); + if (stacklist.free == 0) { + int x; + /* + * obtain some more by using sbrk() + */ + void *more = sbrk(KSTACK * (NSTACKSPERALLOC + 1)); + if (more == 0) + panic("stackalloc: no more stacks"); + /* + * align to KSTACK + */ + more = (void *)((((unsigned long)more) + (KSTACK - 1)) & ~(KSTACK - 1)); + /* + * free all the new stacks onto the freelist + */ + for (x = 0; x < NSTACKSPERALLOC; x++) + _stackfree((char *)more + KSTACK * x); + } + rv = stacklist.free; + stacklist.free = *(void **)rv; + unlock(&stacklist.l); + *tos = rv + KSTACK - sizeof(void*); + *(Proc **)rv = p; + return rv; +} -- cgit v1.2.3