projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 70103b53 KB |
1 | /*- |
| 2 | * Copyright (c) 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * the Systems Programming Group of the University of Utah Computer | |
| 7 | * Science Department. | |
| 8 | * | |
| 9 | * %sccs.include.redist.c% | |
| 10 | */ | |
| 11 | ||
| 12 | #if defined(LIBC_SCCS) && !defined(lint) | |
| 13 | .asciz "@(#)_setjmp.s 5.1 (Berkeley) %G%" | |
| 14 | #endif /* LIBC_SCCS and not lint */ | |
| 15 | ||
| 16 | /* | |
| 17 | * C library -- _setjmp, _longjmp | |
| 18 | * | |
| 19 | * _longjmp(a,v) | |
| 20 | * will generate a "return(v)" from | |
| 21 | * the last call to | |
| 22 | * _setjmp(a) | |
| 23 | * by restoring registers from the stack, | |
| 24 | * The previous signal state is NOT restored. | |
| 25 | */ | |
| 26 | ||
| 27 | #include "DEFS.h" | |
| 28 | ||
| 29 | ENTRY(_setjmp) | |
| 30 | movl sp@(4),a0 /* save area pointer */ | |
| 31 | clrl a0@+ /* no old onstack */ | |
| 32 | clrl a0@+ /* no old sigmask */ | |
| 33 | movl sp,a0@+ /* save old SP */ | |
| 34 | movl a6,a0@+ /* save old FP */ | |
| 35 | clrl a0@+ /* no old AP */ | |
| 36 | movl sp@,a0@+ /* save old PC */ | |
| 37 | clrl a0@+ /* clear PS */ | |
| 38 | moveml #0x3CFC,a0@ /* save other non-scratch regs */ | |
| 39 | clrl d0 /* return zero */ | |
| 40 | rts | |
| 41 | ||
| 42 | ENTRY(_longjmp) | |
| 43 | movl sp@(4),a0 /* save area pointer */ | |
| 44 | addql #8,a0 /* skip onstack/sigmask */ | |
| 45 | tstl a0@ /* ensure non-zero SP */ | |
| 46 | jeq botch /* oops! */ | |
| 47 | movl sp@(8),d0 /* grab return value */ | |
| 48 | jne ok /* non-zero ok */ | |
| 49 | moveq #1,d0 /* else make non-zero */ | |
| 50 | ok: | |
| 51 | movl a0@+,sp /* restore SP */ | |
| 52 | movl a0@+,a6 /* restore FP */ | |
| 53 | addql #4,a0 /* skip AP */ | |
| 54 | movl a0@+,sp@ /* restore PC */ | |
| 55 | moveml a0@(4),#0x3CFC /* restore non-scratch regs */ | |
| 56 | rts | |
| 57 | ||
| 58 | botch: | |
| 59 | jsr _longjmperror | |
| 60 | stop #0 |