projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 619edcce KM |
1 | /* |
| 2 | * Copyright (c) 1988 University of Utah. | |
| 3 | * Copyright (c) 1991 The Regents of the University of California. | |
| 4 | * All rights reserved. | |
| 5 | * | |
| 6 | * This code is derived from software contributed to Berkeley by | |
| 7 | * the Systems Programming Group of the University of Utah Computer | |
| 8 | * Science Department. | |
| 9 | * | |
| 10 | * %sccs.include.redist.c% | |
| 11 | * | |
| 12 | * from: Utah $Hdr: vm_unix.c 1.1 89/11/07$ | |
| 13 | * | |
| 14 | * @(#)vm_unix.c 7.1 (Berkeley) %G% | |
| 15 | */ | |
| 16 | ||
| 17 | /* | |
| 18 | * Traditional sbrk/grow interface to VM | |
| 19 | */ | |
| 20 | #include "param.h" | |
| 21 | #include "systm.h" | |
| 22 | #include "user.h" | |
| 23 | #include "proc.h" | |
| 24 | ||
| 25 | #include "../vm/vm_param.h" | |
| 26 | #include "machine/vmparam.h" | |
| 27 | ||
| 28 | /* ARGSUSED */ | |
| 29 | obreak(p, uap, retval) | |
| 30 | struct proc *p; | |
| 31 | struct args { | |
| 32 | char *nsiz; | |
| 33 | } *uap; | |
| 34 | int *retval; | |
| 35 | { | |
| 36 | vm_offset_t new, old; | |
| 37 | int rv; | |
| 38 | register int diff; | |
| 39 | ||
| 40 | old = (vm_offset_t)u.u_daddr; | |
| 41 | new = round_page(uap->nsiz); | |
| 42 | if ((int)(new - old) > u.u_rlimit[RLIMIT_DATA].rlim_cur) | |
| 43 | return(ENOMEM); | |
| 44 | old = round_page(old + ctob(u.u_dsize)); | |
| 45 | diff = new - old; | |
| 46 | if (diff > 0) { | |
| 47 | rv = vm_allocate(p->p_map, &old, diff, FALSE); | |
| 48 | if (rv != KERN_SUCCESS) { | |
| 49 | uprintf("sbrk: grow failed, return = %d\n", rv); | |
| 50 | return(ENOMEM); | |
| 51 | } | |
| 52 | u.u_dsize += btoc(diff); | |
| 53 | } else if (diff < 0) { | |
| 54 | diff = -diff; | |
| 55 | rv = vm_deallocate(p->p_map, new, diff); | |
| 56 | if (rv != KERN_SUCCESS) { | |
| 57 | uprintf("sbrk: shrink failed, return = %d\n", rv); | |
| 58 | return(ENOMEM); | |
| 59 | } | |
| 60 | u.u_dsize -= btoc(diff); | |
| 61 | } | |
| 62 | return(0); | |
| 63 | } | |
| 64 | ||
| 65 | /* | |
| 66 | * grow the stack to include the SP | |
| 67 | * true return if successful. | |
| 68 | */ | |
| 69 | grow(sp) | |
| 70 | unsigned sp; | |
| 71 | { | |
| 72 | register int si; | |
| 73 | ||
| 74 | /* | |
| 75 | * For user defined stacks (from sendsig). | |
| 76 | */ | |
| 77 | if (sp < (unsigned)u.u_maxsaddr) | |
| 78 | return (0); | |
| 79 | /* | |
| 80 | * For common case of already allocated (from trap). | |
| 81 | */ | |
| 82 | if (sp >= USRSTACK-ctob(u.u_ssize)) | |
| 83 | return (1); | |
| 84 | /* | |
| 85 | * Really need to check vs limit and increment stack size if ok. | |
| 86 | */ | |
| 87 | si = clrnd(btoc(USRSTACK-sp) - u.u_ssize); | |
| 88 | if (u.u_ssize+si > btoc(u.u_rlimit[RLIMIT_STACK].rlim_cur)) | |
| 89 | return (0); | |
| 90 | u.u_ssize += si; | |
| 91 | return (1); | |
| 92 | } | |
| 93 | ||
| 94 | /* ARGSUSED */ | |
| 95 | ovadvise(p, uap, retval) | |
| 96 | struct proc *p; | |
| 97 | struct args { | |
| 98 | int anom; | |
| 99 | } *uap; | |
| 100 | int *retval; | |
| 101 | { | |
| 102 | ||
| 103 | } |