shithub: riscv

ref: c6b757504d33feb7ed968208b4a2215d9bf2b202
dir: /sys/src/libthread/riscv64.c/

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#include <u.h>
#include <libc.h>
#include <thread.h>
#include "threadimpl.h"

/* first argument goes in a register; simplest just to ignore it */
static void
launcherriscv64(int, void (*f)(void *arg), void *arg)
{
	if (f == nil)
		sysfatal("launcherriscv64: nil f passed: arg %#p", arg);
	(*f)(arg);
	threadexits(nil);
}

void
_threadinitstack(Thread *t, void (*f)(void*), void *arg)
{
	uintptr *tos;

	tos = (uintptr *)&t->stk[t->stksize&~7];
	*--tos = (uintptr)arg;
	*--tos = (uintptr)f;
	t->sched[JMPBUFPC] = (uintptr)launcherriscv64+JMPBUFDPC;
	t->sched[JMPBUFSP] = (uintptr)tos - 2*sizeof(uintptr); /* 1st arg, return PC */
}