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#include "tra.h"
/*
setlabel and gotolabel don't save and restore the argument
registers, so we pass fn and arg on the stack as the seventh and
eigth arguments to a trampoline. We could also use the assembler.
*/
static void
tramp(int a0, int a1, int a2, int a3, int a4, int a5,
void (*fn)(void*), void *arg)
{
USED(a0); USED(a1); USED(a2);
USED(a3); USED(a4); USED(a5);
fn(arg);
abort();
}
void
initctxt(Ctxt *l, void (*fn)(void*), void *arg)
{
ulong *stk;
int n;
n = 2*sizeof(ulong);
l->stk = emalloc(n);
stk = (ulong*)((uchar*)l->stk + n);
*--stk = (ulong)arg;
*--stk = (ulong)fn;
l->label.pc = (ulong)tramp+LABELDPC;
l->label.sp = mainlabel.sp-n;
l->label.pv = l->label.pc;
return;
}
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