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 |