ack/mach/m68k2/libsys/head_em.s

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.define .lino,.filn
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.define EXIT,BRK,WRITE
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.define begtext,begdata,begbss
.define EARRAY,ERANGE,ESET,EIDIVZ,EHEAP,EILLINS,ECASE,EBADGTO
.define hol0,.reghp,.limhp,.trpim,.trppc
.sect .text
.sect .rom
.sect .data
.sect .bss
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! EM runtime start-off for the Bleasdale 68000 system
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LINO_AD = 0
FILN_AD = 4
EARRAY = 0
ERANGE = 1
ESET = 2
EIDIVZ = 6
EHEAP = 17
EILLINS = 18
ECASE = 20
EBADGTO = 27
.sect .text
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begtext:
! Bleasdale puts the argument and environment vectors
! themselves on top of the stack, instead of POINTERS
! to these vectors. We get things right here.
move.l 4(sp),a0
clr.l -4(a0)
move.l sp,a0
sub.l #8,sp
move.l (a0),(sp)
add.l #4,a0
move.l a0,4(sp)
1:
tst.l (a0)+
bne 1b
move.l 4(sp),a1
cmp.l (a1),a0
blt 2f
sub.l #4,a0
2:
move.l a0,8(sp)
! Now the stack contains an argc (4 bytes), argv-pointer and
! envp pointer.
add.l #2,sp !convert argc from 4-byte to 2-byte
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jsr __m_a_i_n
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add #010,sp
EXIT:
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move.w d0,-(sp)
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jsr __exit
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BRK:
jmp __brk
WRITE:
jmp __write
.sect .data
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begdata:
hol0:
.lino:
.data2 0,0 ! lino
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.filn:
.data4 0 ! filn
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.reghp:
.data4 endbss
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.limhp:
.data4 endbss
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.trppc:
.data4 0
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.trpim:
.data2 0
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.sect .bss
begbss: !initialization is not needed because ALL entries are in zero space!