projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 2d8189f2 | 1 | /* |
| 42a118aa RE |
2 | * Copyright (c) 1980 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement | |
| 4 | * specifies the terms and conditions for redistribution. | |
| 5 | * | |
| af857331 | 6 | * @(#)traper_.c 5.3 %G% |
| a2b867fb | 7 | * |
| 2d8189f2 DW |
8 | * Full of Magic! DON'T CHANGE ANYTHING !! |
| 9 | * | |
| 10 | * To use from f77: | |
| 11 | * integer oldmsk, traper | |
| 12 | * oldmsk = traper (mask) | |
| af857331 | 13 | * where for vax: |
| 2d8189f2 DW |
14 | * mask = 1 to trap integer overflow |
| 15 | * mask = 2 to trap floating underflow | |
| 16 | * mask = 3 to trap both | |
| 17 | * These 2 bits will be set into the PSW. | |
| 18 | * The old state will be returned. | |
| af857331 KM |
19 | * |
| 20 | * where for CCI: | |
| 21 | * mask = 0 to trap neither | |
| 22 | * mask = 1 to trap integer overflow | |
| 23 | * mask = 2 to trap floating underflow | |
| 24 | * mask = 3 to trap both | |
| 25 | * These 2 bits will be set into the PSL. | |
| 26 | * The old state will be returned. | |
| 2d8189f2 DW |
27 | */ |
| 28 | ||
| af857331 | 29 | #ifdef vax |
| 2d8189f2 DW |
30 | long traper_(msk) |
| 31 | long *msk; | |
| 32 | { | |
| 33 | int old = 0; | |
| 2d8189f2 DW |
34 | #define IOV_MASK 0140 |
| 35 | int **s = &msk; | |
| 36 | int psw; | |
| 37 | ||
| 38 | s -= 5; | |
| 39 | psw = (int)*s; | |
| 40 | old = (psw & IOV_MASK) >> 5; | |
| 41 | psw = (psw & ~IOV_MASK) | ((*msk << 5) & IOV_MASK); | |
| 42 | *s = (int *)psw; | |
| 2d8189f2 DW |
43 | return((long)old); |
| 44 | } | |
| af857331 KM |
45 | #endif vax |
| 46 | ||
| 47 | /* | |
| 48 | * Assumptions for CCI: | |
| 49 | * - the two bits are contiguous in PSL; | |
| 50 | * - integer overflow trap enable bit < floating underflow trap enable bit; | |
| 51 | */ | |
| 52 | #ifdef tahoe | |
| 53 | # include <machine/psl.h> | |
| 54 | ||
| 55 | unsigned long old_msk; | |
| 56 | unsigned short new_msk; | |
| 57 | unsigned long tst_msk; | |
| 58 | ||
| 59 | long traper_(msk) | |
| 60 | long *msk; | |
| 61 | { | |
| 62 | #define IOV_MASK (PSL_IV | PSL_FU) | |
| 63 | #define IOV_DISP 5 | |
| 64 | ||
| 65 | asm(" movpsl _old_msk"); | |
| 66 | ||
| 67 | old_msk = (old_msk & IOV_MASK) >> IOV_DISP; | |
| 68 | ||
| 69 | new_msk = (*msk << IOV_DISP) & IOV_MASK; | |
| 70 | asm(" bispsw _new_msk"); | |
| 71 | ||
| 72 | new_msk = ~(*msk << IOV_DISP) & IOV_MASK; | |
| 73 | asm(" bicpsw _new_msk"); | |
| 74 | ||
| 75 | return(old_msk); | |
| 76 | } | |
| 77 | #endif tahoe |