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arm: build fixes Get p9p to build cleanly for ARM - based on suggestions from rsc and eekee, plus a final tweak from me. Tested (a bit) on sheevaplug (ubuntu jaunty), Nokia N800 (maemo 4) and Nokia N900 (maemo 5). R=rsc CC=plan9port.codebot http://codereview.appspot.com/4524056
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 1 ba940ae6 2009-11-18 rsc #include "threadimpl.h"

 2 ba940ae6 2009-11-18 rsc 

 3 ba940ae6 2009-11-18 rsc void

 4 ba940ae6 2009-11-18 rsc makecontext(ucontext_t *uc, void (*fn)(void), int argc, ...)

 5 ba940ae6 2009-11-18 rsc {

 6 9cf92718 2011-05-18 rsc 	int i, *sp;

 7 9cf92718 2011-05-18 rsc 	va_list arg;

 8 9cf92718 2011-05-18 rsc 

 9 9cf92718 2011-05-18 rsc 	sp = (int*)uc->uc_stack.ss_sp+uc->uc_stack.ss_size/4;

10 9cf92718 2011-05-18 rsc 	va_start(arg, argc);

11 9cf92718 2011-05-18 rsc 	for(i=0; i<4 && i<argc; i++)

12 9cf92718 2011-05-18 rsc 		(&uc->uc_mcontext.arm_r0)[i] = va_arg(arg, uint);

13 9cf92718 2011-05-18 rsc 	va_end(arg);

14 9cf92718 2011-05-18 rsc 	uc->uc_mcontext.arm_sp = (uint)sp;

15 9cf92718 2011-05-18 rsc 	uc->uc_mcontext.arm_lr = (uint)fn;

16 ba940ae6 2009-11-18 rsc }

17 ba940ae6 2009-11-18 rsc 

18 ba940ae6 2009-11-18 rsc int

19 ba940ae6 2009-11-18 rsc swapcontext(ucontext_t *oucp, const ucontext_t *ucp)

20 ba940ae6 2009-11-18 rsc {

21 9cf92718 2011-05-18 rsc 	if(getcontext(oucp) == 0)

22 9cf92718 2011-05-18 rsc 		setcontext(ucp);

23 9cf92718 2011-05-18 rsc 	return 0;

24 ba940ae6 2009-11-18 rsc }

25 ba940ae6 2009-11-18 rsc 

26 ba940ae6 2009-11-18 rsc