ref: b47c096c8ceb7b96820ec886146a674eb9ad2c7b
dir: /sys/src/libthread/alpha.c/
#include <u.h>
#include <libc.h>
#include <thread.h>
#include "threadimpl.h"
/* first argument goes in a register and on the stack; avoid it */
static void
launcheralpha(int, void (*f)(void *arg), void *arg)
{
(*f)(arg);
threadexits(nil);
}
void
_threadinitstack(Thread *t, void (*f)(void*), void *arg)
{
ulong *tos;
tos = (ulong*)&t->stk[t->stksize&~7];
*--tos = 0; /* pad arguments to 8 bytes */
*--tos = (ulong)arg;
*--tos = (ulong)f;
*--tos = 0; /* first arg */
*--tos = 0; /* for alignment with... */
*--tos = 0; /* ... place to store return PC */
t->sched[JMPBUFPC] = (ulong)launcheralpha+JMPBUFDPC;
t->sched[JMPBUFSP] = (ulong)tos;
}