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| Commit | Line | Data |
|---|---|---|
| df02a9f3 | 1 | /* _setjmp.s 4.2 83/07/02 */ |
| a768153c SL |
2 | |
| 3 | /* | |
| 4 | * C library -- _setjmp, _longjmp | |
| 5 | * | |
| 6 | * _longjmp(a,v) | |
| 7 | * will generate a "return(v)" from | |
| 8 | * the last call to | |
| 9 | * _setjmp(a) | |
| 10 | * by restoring registers from the stack, | |
| 11 | * The previous signal state is NOT restored. | |
| 12 | */ | |
| 13 | ||
| 14 | #include "DEFS.h" | |
| 15 | ||
| 16 | ENTRY(_setjmp) | |
| 17 | movl 4(ap),r0 | |
| 18 | movl 12(fp),(r0) # save frame pointer of caller | |
| 19 | movl 16(fp),4(r0) # save pc of caller | |
| 20 | clrl r0 | |
| 21 | ret | |
| 22 | ||
| 23 | ENTRY(_longjmp) | |
| 24 | movl 8(ap),r0 # return(v) | |
| 25 | movl 4(ap),r1 # fetch buffer | |
| 26 | tstl (r1) | |
| 27 | beql botch | |
| 28 | loop: | |
| 29 | bitw $1,6(fp) # r0 saved? | |
| 30 | beql 1f | |
| 31 | movl r0,20(fp) | |
| 32 | bitw $2,6(fp) # was r1 saved? | |
| 33 | beql 2f | |
| 34 | movl r1,24(fp) | |
| 35 | brb 2f | |
| 36 | 1: | |
| 37 | bitw $2,6(fp) # was r1 saved? | |
| 38 | beql 2f | |
| 39 | movl r1,20(fp) | |
| 40 | 2: | |
| 41 | cmpl (r1),12(fp) | |
| 42 | beql done | |
| 43 | blssu botch | |
| 44 | movl $loop,16(fp) | |
| 45 | ret # pop another frame | |
| 46 | ||
| 47 | done: | |
| 48 | cmpb *16(fp),reiins # returning to an "rei"? | |
| 49 | bneq 1f | |
| 50 | movab 3f,16(fp) # do return w/ psl-pc pop | |
| 51 | brw 2f | |
| 52 | 1: | |
| 53 | movab 4f,16(fp) # do standard return | |
| 54 | 2: | |
| 55 | ret # unwind stack before signals enabled | |
| 56 | 3: | |
| 57 | addl2 $8,sp # compensate for PSL-PC push | |
| 58 | 4: | |
| 59 | jmp *4(r1) # done, return.... | |
| 60 | ||
| 61 | botch: | |
| 62 | pushl $msgend-msg | |
| 63 | pushl $msg | |
| 64 | pushl $2 | |
| 65 | calls $3,_write | |
| 66 | halt | |
| 67 | ||
| df02a9f3 | 68 | .data |
| a768153c SL |
69 | msg: .ascii "_longjmp botch\n" |
| 70 | msgend: | |
| 71 | reiins: rei |