diff options
Diffstat (limited to 'emu/Linux/os.c')
| -rw-r--r-- | emu/Linux/os.c | 523 |
1 files changed, 523 insertions, 0 deletions
diff --git a/emu/Linux/os.c b/emu/Linux/os.c new file mode 100644 index 00000000..f541311f --- /dev/null +++ b/emu/Linux/os.c @@ -0,0 +1,523 @@ +#include <sys/types.h> +#include <time.h> +#include <termios.h> +#include <signal.h> +#include <pwd.h> +#include <sched.h> +#include <sys/resource.h> +#include <sys/wait.h> +#include <sys/time.h> + +#include "dat.h" +#include "fns.h" +#include "error.h" + +/* glibc 2.3.3-NTPL messes up getpid() by trying to cache the result, so we'll do it ourselves */ +#include <sys/syscall.h> +#define getpid() syscall(SYS_getpid) + +enum +{ + DELETE = 0x7f, + CTRLC = 'C'-'@', + NSTACKSPERALLOC = 16, + X11STACK= 256*1024 +}; +char *hosttype = "Linux"; + +static void *stackalloc(Proc *p, void **tos); +static void stackfreeandexit(void *stack); + +extern int dflag; + +int gidnobody = -1; +int uidnobody = -1; +static struct termios tinit; + +void +pexit(char *msg, int t) +{ + Osenv *e; + void *kstack; + + lock(&procs.l); + if(up->prev) + up->prev->next = up->next; + else + procs.head = up->next; + + if(up->next) + up->next->prev = up->prev; + else + procs.tail = up->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 = up->kstack; + free(up->prog); + free(up); + if(kstack != nil) + stackfreeandexit(kstack); +} + +void +tramp(void *arg) +{ + Proc *p; + p = arg; + p->pid = p->sigid = getpid(); + (*p->func)(p->arg); + pexit("{Tramp}", 0); +} + +int +kproc(char *name, void (*func)(void*), void *arg, int flags) +{ + int pid; + Proc *p; + Pgrp *pg; + Fgrp *fg; + Egrp *eg; + void *tos; + + p = newproc(); + if(0) + print("start %s:%.8lx\n", name, p); + if(p == nil) { + print("kproc(%s): no memory", name); + return; + } + + 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; + + 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); + + 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 (__clone(tramp, tos, CLONE_PTRACE|CLONE_VM|CLONE_FS|CLONE_FILES|SIGCHLD, p) <= 0) + panic("kproc: clone failed"); + + return 0; +} + +/* + * TO DO: + * To get pc on trap, use sigaction instead of signal and + * examine its siginfo structure + */ + +/* +static void +diserr(char *s, int pc) +{ + char buf[ERRMAX]; + + snprint(buf, sizeof(buf), "%s: pc=0x%lux", s, pc); + disfault(nil, buf); +} +*/ + +static void +trapILL(int signo) +{ + USED(signo); + disfault(nil, "Illegal instruction"); +} + +static void +trapBUS(int signo) +{ + USED(signo); + disfault(nil, "Bus error"); +} + +static void +trapSEGV(int signo) +{ + USED(signo); + disfault(nil, "Segmentation violation"); +} + +#include <fpuctl.h> +static void +trapFPE(int signo) +{ + USED(signo); + print("FPU status=0x%.4lux", getfsr()); + disfault(nil, "Floating exception"); +} + +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 it's a sync error */ + disfault(nil, Eintr); /* Should never happen */ +} + +/* called to wake up kproc blocked on a syscall */ +void +oshostintr(Proc *p) +{ + kill(p->sigid, SIGUSR1); +} + +static void +trapUSR2(int signo) +{ + USED(signo); + /* we've done our work of interrupting sigsuspend */ +} + +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); +} + +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); + error("reboot failure"); +} + +void +libinit(char *imod) +{ + struct termios t; + struct sigaction act; + sigset_t mask; + struct passwd *pw; + Proc *p; + void *tos; + char sys[64]; + + setsid(); + + gethostname(sys, sizeof(sys)); + kstrdup(&ossysname, sys); + pw = getpwnam("nobody"); + if(pw != nil) { + uidnobody = pw->pw_uid; + gidnobody = pw->pw_gid; + } + + if(dflag == 0) + termset(); + + memset(&act, 0 , sizeof(act)); + act.sa_handler = trapUSR1; + sigaction(SIGUSR1, &act, nil); + + sigemptyset(&mask); + sigaddset(&mask, SIGUSR2); + sigprocmask(SIG_BLOCK, &mask, NULL); + + memset(&act, 0 , sizeof(act)); + act.sa_handler = trapUSR2; + sigaction(SIGUSR2, &act, nil); + + act.sa_handler = SIG_IGN; + sigaction(SIGCHLD, &act, nil); + + /* + * For the correct functioning of devcmd in the + * face of exiting slaves + */ + signal(SIGPIPE, SIG_IGN); + if(signal(SIGTERM, SIG_IGN) != SIG_IGN) + signal(SIGTERM, cleanexit); + if(signal(SIGINT, SIG_IGN) != SIG_IGN) + signal(SIGINT, cleanexit); + + if(sflag == 0) { + act.sa_handler = trapBUS; + sigaction(SIGBUS, &act, nil); + act.sa_handler = trapILL; + sigaction(SIGILL, &act, nil); + act.sa_handler = trapSEGV; + sigaction(SIGSEGV, &act, nil); + act.sa_handler = trapFPE; + sigaction(SIGFPE, &act, nil); + } + + 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: + buf[0] = 'H' - '@'; + break; + case CTRLC: + 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; +} + +/* + * 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, NULL); + return 0; +} + +int +limbosleep(ulong milsec) +{ + return osmillisleep(milsec); +} + +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; +} |