doc/pxp/pcrt0.s

.LS .ID
.ta 8n 16n 24n
.nf
/
/ Modified C runtime startoff for pcx
/ with floating point interpreter
/
\&.globl        savr5
\&.globl        fptrap
\&.globl        _exit, _pxpbuf, _main

start:
/
/ If non shared text the following
/ three words will be the beginning of the core image
/
        br      1f
        0                       / 0 = Non-shared text
        _pxpbuf
1:
        sys     signal; 4; fptrap
        setd
        mov     sp,r0
        mov     (r0),-(sp)
        tst     (r0)+
        mov     r0,2(sp)
        jsr     pc,_main
        cmp     (sp)+,(sp)+
        mov     r0,(sp)
        jsr     pc,*$_exit
        sys     exit

\&.bss
savr5:  .=.+2
\&.data
/
/ If pcx is loaded with shared text -n
/ or separate i and d -i, then the
/ following three words will be the first
/ in the core image.  Note that in this
/ case the pointer to the buffer will
/ be deceivingly large.  The first word
/ of offset can be subtracted to correct
/ it without having to do the involved
/ calculations to really calculate the
/ address of the buffer correctly.  We
/ can get away with this because we know the
/ buffer is not in stack space.
/
_info:
        _info
        1               / 1 = pure text
        _pxpbuf
.fi
.LE