setjmp.asm
This message turned up in search, but its forum couldn’t be identified from the original transcript, so it may not be linked into its thread.
The code for setjmp.asm does save the context in the buffer that you
provide, you must provide the ADDRESS of the buffer. The code is:
_setjmp: movea.l (sp)+,a1 get return address from top of
stack and save it in a1 and
increment stack pointer 4 bytes
movea.l (sp),a0 get address of user's buffer.
movem.l sp-a1/d7-d2,(a0) and save registers in user's
buffer.
jmp (a1) return to caller of setjmp.
_longjmp: movea.l 4(sp),a0 address of user's buffer into a0
move.l 8(sp),d0 return code to be handed back.
movem.l (a0),sp-a1/d7-d2 restore from user's buffer.
jmp (a1) return to the instruction after
the most recent call to setjmp
with return code in d0.
Perhaps the confusion is in (sp) is the word the stack pointer
points to, not the value of the stack pointer itself. I've used
this code on the Amiga in my program I'm working on, so I know it
works, just call with setjmp(your_buffer_address) and
longjmp(your_buffer_address,your_return_code) and it should work.