#include "sys/param.h" #include "sys/systm.h" #include "sys/inode.h" #include "sys/dir.h" #include "sys/user.h" #include "sys/psl.h" #include "sys/stat.h" #include "sys/buf.h" #include "sys/pte.h" #include "sys/cmap.h" #include "sys/mtpr.h" #include "sys/vmparam.h" #include "sys/vmmac.h" #include "sys/proc.h" #include "sys/text.h" #include "sys/file.h" #include "sys/reg.h" #include "sys/pioctl.h" #include "sys/conf.h" /* I/O via /proc returns EBUSY if any of these bits are set in p_flag: */ #define SPRBUSY (SLOCK|SPAGE|SKEEP|SWEXIT|SPROCIO) #define SYSADR ((caddr_t)0x80000000) /* virtual address of system seg. */ #define SYSP btop(0x80000000) /* virtual page no. of system seg. */ /* <text page no.> + P1OFF(p) == <stack page no.> of same location */ #define P1OFF(p) (SYSP - (p)->p_szpt*NPTEPG) #define TEXT 0 #define DATA 1 #define STACK 2 #define USERAREA 3 #define min(a,b) ((a) <= (b) ? (a) : (b)) /* inumber to pid */ #define PRMAGIC 64 #define PROCDEV (dev_t)0 #define PRROOT 2 struct proc *prpidlock, *prpidwant, *pritop(); struct pte *Prbufmap; char *priobuf; struct pte *Prusrmap; struct user *prusrutl; struct pte *prclmap(); int prput(), prread(), prwrite(), prstat(); int prmount(), prioctl(), prnami(); struct fstypsw prfs = fsinit(prput, nulldev, prread, prwrite, nulldev, prstat, prnami, prmount, prioctl, nullopen, nodev); prput(ip) struct inode *ip; { struct proc *p; if(ip->i_number == PRROOT) return; if ((p = pritop(ip)) == NULL) return; p->p_trace = 0; } #define SDSIZ sizeof(struct direct) prread(ip) struct inode *ip; { static struct direct dotbuf[] = { { PRROOT, "."}, { PRROOT, ".."} }; struct direct dirbuf; register int i, n, j; int minproc, maxproc, modoff; struct proc *p; if (ip->i_number == PRROOT) { /* fake up . .. and the proc inodes */ if (Lsign(u.u_offset) < 0 || Ltol(u.u_offset) >= ip->i_size || u.u_count <= 0) return; if (Ltol(u.u_offset) < 2*SDSIZ) { iomove((caddr_t)dotbuf + Ltol(u.u_offset), min(u.u_count, 2*SDSIZ - Ltol(u.u_offset)), B_READ); if (u.u_count <= 0 || u.u_error) return; } minproc = (Ltol(u.u_offset) - 2*SDSIZ)/SDSIZ; maxproc = (Ltol(u.u_offset) + u.u_count - 1)/SDSIZ; modoff = Ltol(u.u_offset) % SDSIZ; for (j = 0; j < DIRSIZ; j++) dirbuf.d_name[j] = 0; for (i=minproc; i<min(maxproc,proccnt); i++) { if (proc[i].p_stat == 0) dirbuf.d_ino = 0; else { n = proc[i].p_pid; dirbuf.d_ino = n + PRMAGIC; for (j = 4; j >= 0; j--) dirbuf.d_name[j] = n%10 + '0', n /= 10; } iomove((caddr_t)&dirbuf + modoff, min(u.u_count, SDSIZ - modoff), B_READ); if (u.u_count <= 0 || u.u_error) return; modoff = 0; } } else if ((p = pritop(ip)) != NULL) { if (prlock(p)) return; prusrio(p, B_READ); prunlock(p); } } prwrite(ip) struct inode *ip; { register struct proc *p; if (ip->i_number == PRROOT) { u.u_error = EISDIR; } else if ((p = pritop(ip)) != NULL) { if (prlock(p)) return; prusrio(p, B_WRITE); prunlock(p); } } prstat(ip, ub) struct inode *ip; struct stat *ub; { struct stat ds; struct proc *p = (struct proc *)0; if(ip->i_number == PRROOT || (p = pritop(ip)) != NULL) { ds.st_dev = -1; /* who knows */ ds.st_ino = ip->i_number; ds.st_mode = ip->i_mode; ds.st_nlink = ip->i_nlink; ds.st_uid = ip->i_uid; ds.st_gid = ip->i_gid; ds.st_rdev = -1; if (p) ip->i_size = (int)ptob(p->p_tsize+p->p_dsize+p->p_ssize+UPAGES); ds.st_size = ip->i_size; ds.st_atime = ds.st_mtime = ds.st_ctime = time; if(copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) u.u_error = EFAULT; } } prnami(p, flagp, follow) register struct nx *p; struct argnamei *flagp; { register struct inode *dp; register char *cp; register int n; cp = p->cp; dp = p->dp; if ((dp->i_mode & IFMT) != IFDIR) { u.u_error = ENOTDIR; goto error; } if (access(dp, IEXEC)) goto error; if (flagp->flag != NI_SEARCH) { u.u_error = EACCES; goto error; } rootloop: if (cp[0] == 0) /* "" == root */ return (0); if (cp[0] == '.') { if (cp[1] == 0) /* "." */ return (0); if (cp[1] == '/') { /* "./" ... */ cp += 2; p->cp = cp; goto rootloop; } if (cp[1] == '.' && (cp[2] == 0 || cp[2] == '/')) { /* ".." */ p->dp = dp->i_mpoint; iput(dp); plock(p->dp); p->dp->i_count++; return (1); /* cp still points to ".." */ } u.u_error = ENOENT; /* ".somethingelse" */ goto error; } n = 0; while (*cp >= '0' && *cp <= '9') { n *= 10; n += *cp++ - '0'; } if (*cp) { /* non-digit, or /proc/123/... */ u.u_error = ENOENT; goto error; } p->dp = iget(dp, PROCDEV, n + PRMAGIC); if (p->dp == NULL) goto error; if (p->dp->i_count == 1 && prfillin(p->dp)) goto error; iput(dp); return (0); error: p->dp = NULL; iput(dp); return (0); } prfillin(ip) register struct inode *ip; { register struct proc *p; register int n; ip->i_un.i_proc = NULL; /* safety */ n = ip->i_number - PRMAGIC; for (p = proc; p < procNPROC; p++) if (p->p_stat && p->p_pid == n) break; if (p == procNPROC || p->p_stat == SZOMB || p->p_trace) { iput(ip); u.u_error = ENOENT; return (1); } p->p_trace = ip; if (p->p_textp && p->p_textp->x_iptr && access(p->p_textp->x_iptr, IREAD)) ip->i_mode = IFREG; /* regular, no permissions */ else ip->i_mode = IFREG | 0600; /* regular, r/w only by owner */ ip->i_nlink = 1; ip->i_uid = p->p_uid; ip->i_gid = 1; /* who cares */ ip->i_size = (int)ptob(p->p_tsize+p->p_dsize+p->p_ssize+UPAGES); ip->i_un.i_proc = p; ip->i_un.i_sigmask = 0; /* signal trace mask */ return (0); } prmount(sip, ip, flag, mnt, fstyp) struct inode *sip, *ip; { if (!suser()) return; if (mnt) pron(sip, ip, flag, fstyp); else proff(ip, fstyp); } pron(sip, ip, flag, fstyp) struct inode *sip; register struct inode *ip; { register struct inode *rip; struct inode pi; if (ip->i_fstyp == fstyp) { u.u_error = EBUSY; return; } pi.i_fstyp = fstyp; pi.i_mpoint = NULL; if ((rip = iget(&pi, PROCDEV, (ino_t)PRROOT)) == NULL) return; if (rip->i_count != 1) { /* already mounted */ iput(rip); u.u_error = EBUSY; return; } rip->i_mpoint = ip; rip->i_mode = IFDIR|0555; rip->i_nlink = 2; rip->i_uid = rip->i_gid = 0; rip->i_size = (proccnt+2) * sizeof(struct direct); prele(rip); ip->i_mroot = rip; ip->i_count++; } proff(mip, fstyp) struct inode *mip; { struct inode *rip; plock(mip); rip = mip->i_mroot; mip->i_mroot = NULL; iput(mip); plock(rip); iput(rip); } /* special tracing stuff */ prioctl(ip, cmd, cmaddr) struct inode *ip; caddr_t cmaddr; { register struct proc *p; struct text *xp; struct inode *ixp; int n; /* mostly for integer arguments */ if ((p = pritop(ip)) == NULL) return; switch (cmd) { default: u.u_error = ENOTTY; return; case PIOCGETPR: /* read struct proc */ if (copyout((char *)p, cmaddr, sizeof(struct proc))) u.u_error = EFAULT; return; case PIOCOPENT: /* open text file for reading */ if ((xp = p->p_textp) && (ixp = xp->x_iptr)) { plock(ixp); ixp->i_count++; open1(ixp, FREAD, 0); /* fairly magic linkage */ } else u.u_error = ENOENT; return; case PIOCSTOP: /* send STOP signal and... */ if (p->p_stat != SSTOP) psignal(p, SIGSTOP); /* fall through */ case PIOCWSTOP: /* wait for process to STOP */ if (p->p_stat != SSTOP) tsleep((caddr_t)p->p_trace, PZERO+1, 0); if (p->p_pid != (ip->i_number - PRMAGIC) || p->p_stat == SZOMB) u.u_error = ENOENT; else if (p->p_stat != SSTOP) u.u_error = EINTR; return; case PIOCRUN: /* make process runnable */ if (p->p_stat == SSTOP) setrun(p); return; case PIOCSMASK: /* set signal trace mask */ if (copyin(cmaddr, (caddr_t)&ip->i_un.i_sigmask, sizeof(long))) { u.u_error = EFAULT; return; } if (ip->i_un.i_sigmask) p->p_flag |= (STRC|SPROCTR); else p->p_flag &= ~(STRC|SPROCTR); return; case PIOCCSIG: /* clear current signal */ p->p_cursig = 0; return; case PIOCSSIG: /* set current signal */ if (p->p_stat != SSTOP) u.u_error = EBUSY; else if (copyin(cmaddr, (caddr_t)&n, sizeof(n))) u.u_error = EFAULT; else if ((unsigned)n > NSIG) u.u_error = EINVAL; else p->p_cursig = n; return; case PIOCKILL: /* send signal */ if (copyin(cmaddr, (caddr_t)&n, sizeof(n))) u.u_error = EFAULT; else if ((unsigned)n > NSIG) u.u_error = EINVAL; else psignal(p, n); return; case PIOCSEXEC: /* stop on exec */ p->p_flag |= SSEXEC; return; case PIOCREXEC: /* run on exec */ p->p_flag &= ~SSEXEC; return; case PIOCNICE: /* set nice priority */ if (copyin(cmaddr, (caddr_t)&n, sizeof(n))) { u.u_error = EFAULT; return; } n += p->p_nice; if (n >= 2*NZERO) n = 2*NZERO -1; if (n < 0) n = 0; if (n < p->p_nice && !suser()) return; p->p_nice = n; (void) setpri(p); return; } } /* Lock the process p. */ prlock(p) register struct proc *p; { int s; if (p != u.u_procp) { waitloop: if (prpidlock == p) { /* wait if p has the interlock */ prpidwant = u.u_procp; if (tsleep((caddr_t)&prpidlock, PZERO+1, 0) == TS_SIG) return (u.u_error = EINTR); goto waitloop; } if (p->p_flag & SPAGE) { /* wait if p is paging */ p->p_flag |= SPROCWT; if (tsleep((caddr_t)&(p->p_stat), PZERO+1, 0) == TS_SIG) return (u.u_error = EINTR); goto waitloop; } s = spl6(); /* keep clock out */ if (p->p_flag&SPRBUSY || (p->p_stat != SSLEEP && p->p_stat != SRUN && p->p_stat != SSTOP)) { splx(s); return (u.u_error = EBUSY); } if (p->p_flag&SLOAD && p->p_stat == SRUN) remrq(p); /* he's now invisible to swtch() */ /* interlock; also causes swapin, inhibits swapout, setrq, remrq */ p->p_flag |= SPROCIO; splx(s); /* now do your worst, we don't care */ } u.u_procp->p_flag |= SKEEP; /* if we get swapped, could deadlock */ while ((p->p_flag&SLOAD) == 0) { /* sched will see SPROCIO, swap him in, and signal us */ if (tsleep((caddr_t)&p->p_addr, PZERO+1, 0) == TS_SIG) { prunlock(p); return (u.u_error = EINTR); } } while (prpidlock) { prpidwant = u.u_procp; if (tsleep((caddr_t)&prpidlock, PZERO+1, 0) == TS_SIG) { prunlock(p); return (u.u_error = EINTR); } } prpidlock = u.u_procp; /* now map his user area into kernel space */ uaccess(p, Prusrmap, prusrutl); return (u.u_error = 0); } /* Undo prlock. */ prunlock(p) register struct proc *p; { int s; u.u_procp->p_flag &= ~SKEEP; if (p != u.u_procp) { s = spl6(); /* keep clock out during process state change */ p->p_flag &= ~SPROCIO; if (p->p_flag&SLOAD && p->p_stat == SRUN) setrq(p); /* visible again to swtch() */ splx(s); } if (prpidlock == u.u_procp) { prpidlock = 0; if (prpidwant) { prpidwant = 0; wakeup((caddr_t)&prpidlock); } } return 0; } /* Read/write from/to process p. */ #define REGADR(i) ((caddr_t)(regbase + i)) #define SEEKADR ((caddr_t)Ltol(u.u_offset)) prusrio(p, flag) register struct proc *p; int flag; { register int *regbase; caddr_t maxadr; int segment, resid; u.u_error = 0; if ((u_long)SEEKADR >= (u_long)(maxadr = SYSADR)) u.u_error = EIO; else if (SEEKADR >= (caddr_t)USRSTACK) segment = USERAREA; else if (SEEKADR >= (maxadr = (caddr_t)USRSTACK) - (int)ptob(p->p_ssize)) segment = STACK; else if (SEEKADR < (maxadr = ptob(p->p_tsize))) segment = TEXT; else if (SEEKADR < (maxadr = ptob(p->p_tsize+p->p_dsize))) segment = DATA; else u.u_error = EIO; if (p->p_flag & SSYS && segment != USERAREA) /* too conservative? */ u.u_error = EIO; if (u.u_error) return; if ((flag & B_READ) == 0) switch(segment) { case TEXT: prxdup(p); break; case USERAREA: regbase = prusrutl->u_ar0; if (SEEKADR < REGADR(AP) || (u_long)SEEKADR >= (u_long)(maxadr = REGADR(PS+1))) u.u_error = EIO; else if (SEEKADR >= REGADR(PC)) ; else if (SEEKADR < (maxadr = REGADR(FP+1))) ; else if (SEEKADR < REGADR(R0)) u.u_error = EIO; else if (SEEKADR < (maxadr = REGADR(R11+1))) ; else if (SEEKADR < REGADR(SP) || SEEKADR >= (maxadr = REGADR(SP+1))) u.u_error = EIO; regbase = (int *)((u_long)prusrutl + (u_long)regbase - (u_long)&u); if ((regbase[PS]&PSL_USERSET) != PSL_USERSET || (regbase[PS]&PSL_USERCLR) != 0) u.u_error = EBUSY; break; } if (u.u_error) return; resid = u.u_count; if ((u_long)(Ltol(u.u_offset) + u.u_count) >= (u_long)maxadr) u.u_count = maxadr - (caddr_t)Ltol(u.u_offset); resid -= u.u_count; if (segment == USERAREA) { iomove((caddr_t)prusrutl + ((u_long)Ltol(u.u_offset) - (u_long)&u), u.u_count, flag); if ((flag & B_READ) == 0) { regbase[PS] |= PSL_USERSET; regbase[PS] &= ~PSL_USERCLR; } } else priomove(p, flag); u.u_count += resid; } /* Move data between the object process and us. */ priomove(p, flag) register struct proc *p; { register struct pte *pte; register clofset, clcount; int waslocked; while (u.u_count > 0 && u.u_error == 0) { pte = prclmap(p, (caddr_t)Ltol(u.u_offset), &waslocked); clofset = Ltol(u.u_offset) & CLOFSET; clcount = min(u.u_count, CLSIZE*NBPG - clofset); iomove(&priobuf[clofset], clcount, flag); prclunmap(pte, flag | waslocked); } } /* Map and lock a cluster from process into system space. */ struct pte * prclmap(p, vaddr, flagp) register struct proc *p; register caddr_t vaddr; int *flagp; { register i; register struct pte *pte; i = clbase(btop(vaddr)); if (isassv(p, i)) i -= P1OFF(p); pte = p->p_p0br + i; *flagp = 0; if (pte->pg_v) { if (cmap[pgtocm(pte->pg_pfnum)].c_lock) *flagp = B_PHYS; else mlock(pte->pg_pfnum); } else { p->p_flag |= SDLYU; pagein(vaddr, prusrutl); p->p_flag &= ~SDLYU; if (!pte->pg_v) panic("prclmap: pte not valid after pagein"); } for (i=0; i<CLSIZE; i++) { *(int *)(Prbufmap + i) = PG_V | PG_KW | (pte->pg_pfnum + i); mtpr(TBIS, &priobuf[i*NBPG]); } return pte; } /* Release a cluster, updating its pte's. */ prclunmap(pte, flag) register struct pte *pte; { register i; if ((flag & B_PHYS) == 0) munlock(pte->pg_pfnum); if ((flag & B_READ) == 0) /* Write to device writes memory */ for (i=0; i<CLSIZE; i++) (pte+i)->pg_m = 1; } /* Prepare the process' text segment for writing, duplicating it if necessary. */ prxdup(p) register struct proc *p; { register struct text *xp, *pxp; if ((pxp = p->p_textp) == 0) return 0; if (!(pxp->x_flag&XPAGI) && pxp->x_count == 1) { pxp->x_flag |= XTRC|XWRIT; return 0; } if (pxp->x_flag&XTRC) panic("prxdup"); for (xp = text; xp < textNTEXT && xp->x_iptr; xp++) /* void */ ; if (xp >= textNTEXT) return (u.u_error = ENOSPC); xp->x_flag = XLOCK|XTRC|XLOAD; xp->x_size = pxp->x_size; if (vsxalloc(xp) == NULL) return (u.u_error = ENOSPC); xp->x_count = 1; xp->x_ccount = 0; xp->x_rssize = 0; (xp->x_iptr = pxp->x_iptr)->i_count++; xlock(pxp); --pxp->x_count; pxp->x_flag &= ~XLOCK; xccdec(pxp, p); p->p_textp = xp; xlink(p); p->p_flag &= ~SPAGI; prxread(p, prusrutl); xp->x_flag |= XWRIT; xp->x_flag &= ~XLOAD; xunlock(xp); return u.u_error; } prxread(p, up) register struct proc *p; struct user *up; { register struct inode *ip = p->p_textp->x_iptr; register count; register struct pte *pte; register caddr_t vaddr = 0; int waslocked; caddr_t ubase = u.u_base; unsigned int ucount = u.u_count; off_t uoffset = Ltol(u.u_offset); plock(ip); ip->i_flag |= ITEXT; count = up->u_exdata.ux_tsize; if (up->u_exdata.ux_mag == 0413) /* 0413 on 4k file sys */ u.u_offset = ltoL(BSIZE(0)); else u.u_offset = ltoL(sizeof(u.u_exdata)); u.u_segflg = SEGSYS; u.u_count = 0; while (count > 0 && u.u_count == 0) { pte = prclmap(p, vaddr, &waslocked); u.u_base = (caddr_t)priobuf; count -= u.u_count = min(count, CLSIZE*NBPG); vaddr += u.u_count; readi(ip); prclunmap(pte, B_WRITE | waslocked); } prele(ip); u.u_base = ubase; u.u_count = ucount; u.u_offset = ltoL(uoffset); u.u_segflg = SEGUDATA; return (count ? (u.u_error = EIO) : 0); } struct proc * pritop(ip) struct inode *ip; { register struct proc *p; if ((p = ip->i_un.i_proc) == NULL || p->p_pid != ip->i_number - PRMAGIC || p->p_stat == 0 || p->p_stat == SZOMB) { u.u_error = ENOENT; /* should really be ENXIO */ return (NULL); } return (p); }