projects / unix-history / blame
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|---|---|---|
| 586c39b1 DF |
1 | /* |
| 2 | * Copyright (c) 1980 Regents of the University of California. | |
| 493b70ca KB |
3 | * All rights reserved. |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms are permitted | |
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6 | * provided that the above copyright notice and this paragraph are |
| 7 | * duplicated in all such forms and that any documentation, | |
| 8 | * advertising materials, and other materials related to such | |
| 9 | * distribution and use acknowledge that the software was developed | |
| 10 | * by the University of California, Berkeley. The name of the | |
| 11 | * University may not be used to endorse or promote products derived | |
| 12 | * from this software without specific prior written permission. | |
| 13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
| 14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
| 15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
| 586c39b1 DF |
16 | */ |
| 17 | ||
| f4f66d2c KB |
18 | #if defined(LIBC_SCCS) && !defined(lint) |
| 19 | .asciz "@(#)_setjmp.s 5.7 (Berkeley) %G%" | |
| 20 | #endif /* LIBC_SCCS and not lint */ | |
| a768153c SL |
21 | |
| 22 | /* | |
| 23 | * C library -- _setjmp, _longjmp | |
| 24 | * | |
| 25 | * _longjmp(a,v) | |
| 26 | * will generate a "return(v)" from | |
| 27 | * the last call to | |
| 28 | * _setjmp(a) | |
| 29 | * by restoring registers from the stack, | |
| 30 | * The previous signal state is NOT restored. | |
| 31 | */ | |
| 32 | ||
| 33 | #include "DEFS.h" | |
| 34 | ||
| dadab5a2 | 35 | ENTRY(_setjmp, 0) |
| a768153c SL |
36 | movl 4(ap),r0 |
| 37 | movl 12(fp),(r0) # save frame pointer of caller | |
| 38 | movl 16(fp),4(r0) # save pc of caller | |
| 39 | clrl r0 | |
| 40 | ret | |
| 41 | ||
| dadab5a2 | 42 | ENTRY(_longjmp, 0) |
| a768153c SL |
43 | movl 8(ap),r0 # return(v) |
| 44 | movl 4(ap),r1 # fetch buffer | |
| 45 | tstl (r1) | |
| 46 | beql botch | |
| 47 | loop: | |
| 48 | bitw $1,6(fp) # r0 saved? | |
| 49 | beql 1f | |
| 50 | movl r0,20(fp) | |
| 51 | bitw $2,6(fp) # was r1 saved? | |
| 52 | beql 2f | |
| 53 | movl r1,24(fp) | |
| 54 | brb 2f | |
| 55 | 1: | |
| 56 | bitw $2,6(fp) # was r1 saved? | |
| 57 | beql 2f | |
| 58 | movl r1,20(fp) | |
| 59 | 2: | |
| 60 | cmpl (r1),12(fp) | |
| 61 | beql done | |
| 62 | blssu botch | |
| 63 | movl $loop,16(fp) | |
| 64 | ret # pop another frame | |
| 65 | ||
| 66 | done: | |
| 67 | cmpb *16(fp),reiins # returning to an "rei"? | |
| 68 | bneq 1f | |
| 69 | movab 3f,16(fp) # do return w/ psl-pc pop | |
| 70 | brw 2f | |
| 71 | 1: | |
| 72 | movab 4f,16(fp) # do standard return | |
| 73 | 2: | |
| 74 | ret # unwind stack before signals enabled | |
| 75 | 3: | |
| 76 | addl2 $8,sp # compensate for PSL-PC push | |
| 77 | 4: | |
| 78 | jmp *4(r1) # done, return.... | |
| 79 | ||
| 80 | botch: | |
| f6a3ad26 | 81 | calls $0,_longjmperror |
| a768153c | 82 | halt |
| 687624f7 MK |
83 | |
| 84 | .data | |
| 85 | reiins: rei |