113 lines
2.4 KiB
Plaintext
Executable File
113 lines
2.4 KiB
Plaintext
Executable File
#
|
|
mes 2,_EM_WSIZE,_EM_PSIZE
|
|
;
|
|
; layout of a setjmp buffer:
|
|
;
|
|
; -----------------
|
|
; | flag | (!0 when blocked signals saved (POSIX))
|
|
; -----------------
|
|
; | signal mask/set | (for Berkeley 4.[2-] / POSIX)
|
|
; -----------------
|
|
; | |
|
|
; | GTO descriptor |
|
|
; | (SP, LB, PC) |
|
|
; | |
|
|
; -----------------
|
|
;
|
|
; setjmp saves the signalmask, PC, SP, and LB of caller, and creates a
|
|
; GTO descriptor from this.
|
|
; The big problem here is how to get the return address, i.e. the PC of
|
|
; the caller; This problem is solved by the front-end, which must pass
|
|
; it as an extra parameter to setjmp.
|
|
|
|
; a GTO descriptor must be in the global data area
|
|
gtobuf
|
|
bss 3*_EM_PSIZE,0,0
|
|
|
|
inp $fill_ret_area
|
|
exp $__setjmp
|
|
pro $__setjmp,0
|
|
#if defined(_POSIX_SOURCE)
|
|
; save mask of currently blocked signals.
|
|
; longjmp must restore this mask
|
|
lol _EM_PSIZE ; the flag integer at offset _EM_PSIZE
|
|
lal 0
|
|
loi _EM_PSIZE
|
|
stf 3*_EM_PSIZE+_EM_LSIZE
|
|
lol _EM_PSIZE ; the flag integer at offset _EM_PSIZE
|
|
zeq *1
|
|
lal 0
|
|
loi _EM_PSIZE
|
|
adp 3*_EM_PSIZE
|
|
cal $__newsigset
|
|
asp _EM_PSIZE
|
|
1
|
|
#elif defined(__BSD4_2)
|
|
loc 0
|
|
cal $sigblock
|
|
asp _EM_WSIZE
|
|
lfr _EM_WSIZE
|
|
lal 0
|
|
loi _EM_PSIZE
|
|
stf 3*_EM_PSIZE
|
|
#endif
|
|
; create GTO descriptor for longjmp
|
|
lxl 0
|
|
dch ; Local Base of caller
|
|
lxa 0 ; Stackpointer of caller
|
|
lal _EM_PSIZE+_EM_WSIZE
|
|
loi _EM_PSIZE ; Return address of caller
|
|
lal 0
|
|
loi _EM_PSIZE ; address of jmpbuf
|
|
sti 3*_EM_PSIZE ; LB, SP, and PC stored in jmpbuf
|
|
loc 0
|
|
ret _EM_WSIZE ; setjmp must return 0
|
|
end 0
|
|
|
|
pro $fill_ret_area,0
|
|
; put argument in function result area
|
|
lol 0
|
|
ret _EM_WSIZE
|
|
end 0
|
|
|
|
exp $longjmp
|
|
pro $longjmp,?
|
|
#if defined(_POSIX_SOURCE)
|
|
; restore blocked mask
|
|
lal 0
|
|
loi _EM_PSIZE
|
|
lof 3*_EM_PSIZE+_EM_LSIZE
|
|
zeq *2
|
|
lal 0
|
|
loi _EM_PSIZE
|
|
adp 3*_EM_PSIZE
|
|
cal $__oldsigset
|
|
asp _EM_PSIZE
|
|
2
|
|
#elif defined(__BSD4_2)
|
|
; restore signal mask
|
|
lal 0
|
|
loi _EM_PSIZE
|
|
lof 3*_EM_PSIZE
|
|
cal $_sigsetmask
|
|
asp _EM_WSIZE
|
|
lfr _EM_WSIZE
|
|
asp _EM_WSIZE
|
|
#endif
|
|
lal 0
|
|
loi _EM_PSIZE ; address of jmpbuf
|
|
lae gtobuf
|
|
blm 3*_EM_PSIZE ; fill GTO descriptor from jmpbuf
|
|
lol _EM_PSIZE ; second parameter of longjmp: the return value
|
|
dup _EM_WSIZE
|
|
zne *3
|
|
; of course, longjmp may not return 0!
|
|
inc
|
|
3
|
|
; put return value in function result area
|
|
cal $fill_ret_area
|
|
asp _EM_WSIZE
|
|
gto gtobuf ; there we go ...
|
|
; ASP and GTO do not damage function result area
|
|
end 0
|