+/ ld1 -- link editor
+
+orig:
+ sys signal; 2; 1
+ ror r0
+ bcs 1f
+ sys signal; 2; sintr
+1:
+ mov (sp)+,r0
+ dec r0
+ bgt 1f
+ clr r0
+ sys exit
+1:
+ mov r0,argc
+ mov sp,argp
+1:
+ jsr r5,nxtarg
+ br pass2
+ jsr r5,load1
+ br 1b
+
+pass2:
+ sys creat; l.out; 666
+ bec 1f
+ clr filnam
+ jsr r5,mesg; outfile
+ mov $10,r0
+ sys exit
+1:
+ mov r0,fout
+ mov $symtab,r5
+1:
+ cmp r5,esymp
+ bhis 1f
+ cmp 10(r5),$40 / undefined?
+ bne 2f
+ tst 12(r5) / common?
+ bne 2f
+ jsr r0,issymbol; _end
+ br 2f
+ jsr r0,issymbol; _etext
+ br 2f
+ jsr r0,issymbol; _edata
+ br 2f
+ clr relflg / save relocation
+ br 1f
+2:
+ add $14,r5
+ br 1b
+1:
+ mov txtsiz,r1
+ tst nflg
+ beq 1f
+ add $77,r1 / 0 mod 64
+ bic $77,r1
+ mov r1,txtsiz
+ add $17777,r1
+ bic $17777,r1
+1:
+ mov datsiz,r2
+ mov r1,r3
+ add r2,r3 / bss origin
+ clr r4
+ tst dcom
+ bne 1f
+ tst relflg
+ beq 9f
+1:
+ mov $symtab,r5
+1:
+ cmp r5,esymp
+ bhis 1f
+ cmp 10(r5),$40 / undefined
+ bne 2f
+ mov 12(r5),r0 / common?
+ beq 2f / no
+ mov r4,12(r5) / common origin
+ add r3,12(r5)
+ inc r0
+ bic $1,r0 / even
+ add r0,r4 / new common origin
+ mov $47,10(r5) / temp. common type
+2:
+ add $14,r5
+ br 1b
+1:
+ add r4,bsssiz
+9:
+ mov $symtab,r5
+1:
+ cmp r5,esymp
+ bhis 1f
+ tst dcom
+ bne 3f
+ tst relflg
+ beq 2f
+3:
+ cmp 10(r5),$40 / undefined
+ bne 2f
+ tst 12(r5) / common?
+ bne 2f
+ jsr r0,issymbol; _end
+ br 3f
+ br 4f
+3:
+ mov $44,10(r5) / bss type
+ mov bsssiz,12(r5) / at end of bss
+ sub r4,12(r5) / common compensation
+ br 2f
+4:
+ jsr r0,issymbol; _etext
+ br 3f
+ br 4f
+3:
+ mov $42,10(r5) / text type
+ mov txtsiz,12(r5) / at end of text
+4:
+ jsr r0,issymbol; _edata
+ br 3f
+ br 2f
+3:
+ mov $43,10(r5) / data type
+ mov datsiz,12(r5)
+2:
+ cmp 10(r5),$43
+ blt 2f / undef, abs or text
+ beq 3f
+ cmp 10(r5),$47 / common
+ bne 4f
+ mov $44,10(r5) / set bss
+ br 2f
+4:
+ add r2,12(r5) / bss
+ add r4,12(r5) / common total
+3:
+ add r1,12(r5) / data
+2:
+ add $14,r5
+ br 1b
+1:
+ mov r1,fdatorg
+ mov r3,fbssorg
+ add r4,fbssorg
+ mov symsiz,locsymsiz
+ add esymp,symsiz
+ sub $symtab,symsiz
+ tst sqflg
+ beq 1f
+ clr symsiz
+1:
+ jsr r5,oattach; otxtp; zero
+ add $20,oattpt
+ jsr r5,oattach; odatp; txtsiz
+ tst relflg / suppress relocation?
+ bne 1f
+ jsr r5,oattach; otrelp; datsiz
+ jsr r5,oattach; odrelp; txtsiz
+1:
+ jsr r5,oattach; osymp; datsiz
+ tst entptr
+ beq 1f
+ tst exorig
+ beq 2f
+ jsr r5,mesg; mulent / too many entry points
+2:
+ mov entptr,r0
+ mov 12(r0),exorig
+ inc exorig / 0 entry means none
+1:
+ mov $7,-(sp)
+ mov $magic,r1 / write magic at start
+ tst sqflg
+ beq 1f
+ clr symsiz
+1:
+ mov (r1)+,r0
+ tst nflg
+ beq 1f
+ inc r0 / ro text segment
+1:
+ jsr r5,putwrd; otxtp
+1:
+ mov (r1)+,r0
+ jsr r5,putwrd; otxtp
+ dec (sp)
+ bne 1b
+ tst (sp)+
+ clr txtsiz
+ clr datsiz
+ clr bsssiz
+ clr *rlistp
+ mov $rlist,rlistp
+1:
+ jsr r5,nxtarg2
+ br 1f
+ jsr r5,load2
+ br 1b
+1:
+ jsr r5,flush; otxtp
+ jsr r5,flush; odatp
+ tst relflg
+ bne 1f
+ jsr r5,flush; otrelp
+ jsr r5,flush; odrelp
+1:
+ mov $symtab,r1
+1:
+ cmp r1,esymp
+ bhis 1f
+ tst clrelflg
+ bne 2f
+ cmp 10(r1),$40
+ bne 2f
+ tst 12(r1) / common?
+ bne 2f
+ mov r1,r0
+ clr filnam
+ jsr r5,smesg; undmes
+2:
+ tst sqflg
+ beq 3f
+ add $14,r1
+ br 1b
+3:
+ mov $6,r2
+2:
+ mov (r1)+,r0
+ jsr r5,putwrd; osymp
+ dec r2
+ bne 2b
+ br 1b
+1:
+ jsr r5,flush; osymp
+done:
+ sys unlink; a.out
+ sys link; l.out; a.out
+ bec 1f
+ clr filnam
+ jsr r5,mesg; movemes
+ mov $10,r0
+ sys exit
+1:
+ sys unlink; l.out
+ sys chmod; a.out; outmod: 777
+ mov errcnt,r0
+ sys exit
+sintr:
+ sys unlink; l.out
+ mov $6,r0
+ sys exit
+
+load1:
+ mov txtsiz,txtorg
+ mov datsiz,datorg
+ sub ctxtsiz,datorg
+ mov bsssiz,bssorg
+ sub ctxtsiz,bssorg
+ sub cdatsiz,bssorg
+ mov $14,locsymsiz
+ clr ndef
+ mov r5,-(sp)
+ mov esymp,-(sp)
+ mov $local,r5
+ jsr r5,attach; txtp; csymorg
+1:
+ jsr r5,getsym
+ bvs 1f
+ cmp symbol+10,$40
+ bge 2f / external
+ tst xtflg
+ bne 1b
+ add $14,locsymsiz / count locals
+ br 1b
+2:
+ jsr r5,lookup
+ mov (r4),r0
+ beq 2f / not yet in table
+ cmp 10(r0),$40
+ bgt 1b / multiply defined
+ cmp symbol+10,$42 / is text?
+ bne 3f
+ tst 12(r0) / is genuine common?
+ bne 1b / yes, don't satisfy with text
+3:
+ inc ndef / remember def occurred
+ cmp symbol+10,$40
+ bgt 3f
+ dec ndef / forget def occurred
+ cmp 12(r0),symbol+12 / extend common region?
+ bge 1b
+ br 3f
+2:
+ mov r4,(r5)+
+ jsr r5,enter
+ cmp symbol+10,$40
+ ble 1b
+3:
+ jsr r5,relsym
+ mov (r4),r0
+ mov symbol+10,10(r0)
+ mov symbol+12,12(r0)
+ br 1b
+1:
+ tst libflg / load anyway if not library
+ beq 1f
+ tst ndef / load library if any definitions
+ bne 1f
+ mov (sp)+,esymp / rip out symbols
+2:
+ cmp r5,$local / see if end of entered symbols
+ blos 2f
+ clr *-(r5) / rip out hash entry
+ br 2b
+1:
+ tst (sp)+
+ tst entry
+ beq 1f
+ add txtorg,entry
+ tst exorig
+ beq 5f
+ jsr r5,mesg; mulent
+5:
+ mov entry,exorig
+1:
+ add locsymsiz,symsiz / total of local symbs
+ mov rlistp,r0
+ cmp r0,$rliste
+ blo 1f
+ jsr r5,mesg; toomany
+ jmp done
+1:
+ mov reopened,r1
+ bne 1f
+ mov *argp,r1
+ cmp r1,$libfil
+ bne 1f
+ movb wlib,r1 / library, just remember letter name
+1:
+ mov r1,(r0)+
+ mov libflg,(r0)+ / remember start of routine
+ beq 3f / not library
+ bis $1,reopened
+3:
+ mov r0,rlistp
+ jsr r5,addin
+2:
+ mov (sp)+,r5
+ rts r5
+
+load2:
+ mov txtsiz,txtorg
+ mov fdatorg,r0
+ add datsiz,r0
+ sub ctxtsiz,r0
+ mov r0,datorg
+ mov fbssorg,r0
+ add bsssiz,r0
+ sub ctxtsiz,r0
+ sub cdatsiz,r0
+ mov r0,bssorg
+ mov r5,-(sp)
+ jsr r5,attach; txtp; csymorg
+ mov $local,r5
+ mov $-1,-(sp) / local symbol index
+ mov filnam,r1
+2:
+ tstb (r1)+
+ bne 2b
+2:
+ cmp r1,filnam
+ blos 2f
+ cmpb -(r1),$'/
+ bne 2b
+ tstb (r1)+
+2:
+ mov $symbol,r0
+2:
+ movb (r1)+,(r0)+
+ bne 3f
+ tstb -(r1)
+3:
+ cmp r0,$symbol+8.
+ blo 2b
+ mov $37,symbol+10
+ mov txtorg,symbol+12
+ tst sqflg
+ bne 1f
+ jsr r5,wrlocsym
+1:
+ jsr r5,getsym
+ bvs 1f
+ jsr r5,relsym
+ inc (sp)
+ cmp symbol+10,$40
+ blo 5f
+ jsr r5,lookup
+ tst (r4)
+ bne 6f
+ jsr r5,mesg; snotfound
+ br 1b
+6:
+ cmp symbol+10,$40
+ bgt 2f
+ beq 4f
+5:
+ tst xtflg
+ bne 1b / skip locals
+ jsr r5,wrlocsym / write local symbol
+ br 1b
+2:
+ mov (r4),r0
+ cmp 10(r0),symbol+10
+ bne 2f
+ cmp 12(r0),symbol+12
+ beq 4f
+2:
+ jsr r5,smesg; multi
+4:
+ cmp r5,$elocal
+ blo 3f
+ jsr r5,mesg; locovflo
+ jmp done
+3:
+ mov (sp),(r5)+ / save local index
+ mov (r4),(r5)+ / save symbol location
+ br 1b
+1:
+ mov r5,locp
+ tst (sp)+
+ jsr r5,attach; txtp; ctxtorg
+ jsr r5,attach; relp; ctrelorg
+ mov txtsiz,relbas
+1:
+ jsr r5,txtlod
+ br 1f
+ tst relflg
+ bne 2f
+ jsr r5,putwrd; otrelp
+2:
+ mov r3,r0
+ jsr r5,putwrd; otxtp
+ br 1b
+1:
+ jsr r5,attach; txtp; cdatorg
+ jsr r5,attach; relp; cdrelorg
+ mov datorg,r0
+ mov r0,relbas
+ mov r5,locp
+ mov (sp)+,r5
+1:
+ jsr r5,txtlod
+ br 1f
+ tst relflg
+ bne 2f
+ jsr r5,putwrd; odrelp
+2:
+ mov r3,r0
+ jsr r5,putwrd; odatp
+ br 1b
+1:
+ jsr r5,addin
+ rts r5
+
+txtlod:
+ jsr r5,getwrd; txtp
+ bvs 1f
+ tst (r5)+
+ mov r0,r3
+ jsr r5,getwrd; relp
+ bvc 2f
+ jsr r5,mesg; relerr
+ mov $4,r0
+ sys exit
+2:
+ mov r0,r2
+ bic $1,r2
+ bic $!17,r0
+ cmp r0,$7
+ blos 3f
+/ external symbol reference
+ clc
+ ror r2
+ asr r2
+ asr r2
+ asr r2 / get symbol number
+ jsr r5,lookloc / get symbol
+ cmp 10(r4),$40
+ bgt 2f
+/ still undefined
+ sub $symtab,r4
+ add locsymsiz,r4
+ mov r5,-(sp)
+ mov r4,r5
+ clr r4
+ dvd $14,r4
+ als $4,r4
+ bis r4,r0
+ mov (sp)+,r5
+ br relrel
+2:
+/ symbol now defined
+ add 12(r4),r3 / symbol value
+ mov 10(r4),r2
+ sub $41,r2
+ bic $!1,r0
+ bne 4f
+ tst r2
+ beq 5f / not relative & relocatable
+ add dotdot,r3
+ br 5f
+4:
+ tst r2
+ bne 5f / relative & absolute
+ sub dotdot,r3
+5:
+ asl r2
+ bis r2,r0
+ br relrel
+/ absolute, text, data, or bss symbol
+3:
+ add *reltab(r2),r3
+relrel:
+ bit $1,r0
+ beq 1f
+ sub relbas,r3 / relative relocation
+1:
+ rts r5
+
+wrlocsym:
+ mov $symbol,r1
+ mov $6,-(sp)
+3:
+ mov (r1)+,r0
+ jsr r5,putwrd; osymp / write out local symbol
+ dec (sp)
+ bne 3b
+ tst (sp)+
+ rts r5
+
projects / unix-history / commitdiff