projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 4b9ccde7 | 1 | # @(#)mcrt0.s 4.1 (Berkeley) 12/21/80 |
| 9c8fc5ca BJ |
2 | # C runtime startoff including monitoring |
| 3 | ||
| 4 | .set exit,1 | |
| 5 | .set cbufs,300 | |
| 6 | ||
| 7 | .globl start | |
| 8 | .globl _monitor | |
| 9 | .globl _sbrk | |
| 10 | .globl _main | |
| 11 | .globl _exit | |
| 12 | .globl _IEH3exit | |
| 13 | .globl _etext | |
| 14 | .globl _environ | |
| 15 | .globl __cleanup | |
| 16 | .comm countbase,4 | |
| 17 | ||
| 18 | ||
| 19 | start: | |
| 20 | .word 0x0000 | |
| 21 | subl2 $8,sp | |
| 22 | movl 8(sp),(sp) # argc | |
| 23 | movab 12(sp),r0 | |
| 24 | movl r0,4(sp) # argv | |
| 25 | L1: | |
| 26 | tstl (r0)+ # null args term ? | |
| 27 | bneq L1 | |
| 28 | cmpl r0,*4(sp) # end of 'env' or 'argv' ? | |
| 29 | blss L2 | |
| 30 | tstl -(r0) # envp's are in list | |
| 31 | L2: | |
| 32 | movl r0,8(sp) # env | |
| 33 | movl r0,_environ # indir is 0 if no env ; not 0 if env | |
| 34 | ||
| 35 | subl3 $eprol,$_etext,r1 | |
| 36 | addl2 $7,r1 | |
| 37 | extzv $3,$16,r1,r1 | |
| 38 | addl2 r1,r1 # tally size | |
| 39 | addl2 $8*cbufs+12,r1 # entrance count plus header | |
| 40 | pushl $cbufs # # entrance counters | |
| 41 | pushl r1 # bufsiz | |
| 42 | pushl r1 # for sbrk | |
| 43 | calls $1,_sbrk | |
| 44 | cmpl r0,$-1 | |
| 45 | beql nospace | |
| 46 | # bandaid for sbrk not clearing memory (remove bandaid when fixed) | |
| 47 | # addl3 (sp),(sp),r1 | |
| 48 | #L100: | |
| 49 | # clrb -1(r0)[r1] | |
| 50 | # sobgtr r1,L100 | |
| 51 | # end bandaid | |
| 52 | pushl r0 | |
| 53 | addl3 $12,r0,countbase | |
| 54 | pushab _etext | |
| 55 | pushab eprol | |
| 56 | calls $5,_monitor | |
| 57 | calls $3,_main | |
| 58 | pushl r0 | |
| 59 | calls $1,_exit | |
| 60 | ||
| 61 | .data | |
| 62 | _environ: .space 4 | |
| 63 | emsg: | |
| 64 | .byte 'N,'o,' ,'s,'p,'a,'c,'e,' ,'f,'o,'r,' | |
| 65 | .byte 'm,'o,'n,'i,'t,'o,'r,' ,'b,'u,'f,'f,'e,'r,0xa,0x0 | |
| 66 | em1: | |
| 67 | .text | |
| 68 | ||
| 69 | nospace: | |
| 70 | pushl $em1-emsg | |
| 71 | pushab emsg | |
| 72 | pushl $2 | |
| 73 | calls $3,_write | |
| 74 | ||
| 75 | _exit: | |
| 76 | _IEH3exit: | |
| 77 | .word 0x0000 | |
| 78 | calls $0,__cleanup | |
| 79 | pushl $0 | |
| 80 | calls $1,_monitor | |
| 81 | chmk $exit | |
| 82 | eprol: | |
| 83 | ||
| 84 |