darwin 386 start

src/libthread/Darwin-386-asm.s

@@ -0,0 +1,52 @@
+.globl _tas
+_tas:
+	movl $0xCAFEBABE, %eax
+	movl 4(%esp), %ecx
+	xchgl %eax, 0(%ecx)
+	ret
+
+.globl _getmcontext
+_getmcontext:
+	movl	4(%esp), %eax
+
+	movl	%fs, 8(%eax)
+	movl	%es, 12(%eax)
+	movl	%ds, 16(%eax)
+	movl	%ss, 76(%eax)
+	movl	%edi, 20(%eax)
+	movl	%esi, 24(%eax)
+	movl	%ebp, 28(%eax)
+	movl	%ebx, 36(%eax)
+	movl	%edx, 40(%eax)		 
+	movl	%ecx, 44(%eax)
+
+	movl	$1, 48(%eax)	/* %eax */
+	movl	(%esp), %ecx	/* %eip */
+	movl	%ecx, 60(%eax)
+	leal	4(%esp), %ecx	/* %esp */
+	movl	%ecx, 72(%eax)
+
+	movl	44(%eax), %ecx	/* restore %ecx */
+	movl	$0, %eax
+	ret
+
+.globl _setmcontext
+_setmcontext:
+	movl	4(%esp), %eax
+
+	movl	8(%eax), %fs
+	movl	12(%eax), %es
+	movl	16(%eax), %ds
+	movl	76(%eax), %ss
+	movl	20(%eax), %edi
+	movl	24(%eax), %esi
+	movl	28(%eax), %ebp
+	movl	36(%eax), %ebx
+	movl	40(%eax), %edx
+	movl	44(%eax), %ecx
+
+	movl	72(%eax), %esp
+	pushl	60(%eax)	/* new %eip */
+	movl	48(%eax), %eax
+	ret
+

src/libthread/Darwin-386.c

@@ -0,0 +1,23 @@
+#include "threadimpl.h"
+
+void
+makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
+{
+	int *sp;
+
+	sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
+	sp -= argc;
+	memmove(sp, &argc+1, argc*sizeof(int));
+	*--sp = 0;		/* return address */
+	ucp->uc_mcontext.mc_eip = (long)func;
+	ucp->uc_mcontext.mc_esp = (int)sp;
+}
+
+int
+swapcontext(ucontext_t *oucp, ucontext_t *ucp)
+{
+	if(getcontext(oucp) == 0)
+		setcontext(ucp);
+	return 0;
+}
+

src/libthread/test/tcontext.c

@@ -0,0 +1,27 @@
+#include "../threadimpl.h"
+#undef exits
+
+
+ucontext_t c0, c1;
+char stack[65536];
+
+void
+go(void *v)
+{
+	print("hello, world\n");
+	setcontext(&c0);
+}
+
+void
+main(void)
+{
+//	print("in main\n");
+	getcontext(&c1);
+	c1.uc_stack.ss_sp = stack;
+	c1.uc_stack.ss_size = sizeof stack;
+	makecontext(&c1, go, 1, 0);
+	if(getcontext(&c0) == 0)
+		setcontext(&c1);
+	print("back in main\n");
+	exits(0);
+}

src/libthread/test/thello.c

@@ -0,0 +1,10 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+
+void
+threadmain(int argc, char **argv)
+{
+	print("hello, world\n");
+}
+

src/libthread/thread.c

@@ -624,6 +624,7 @@ main(int argc, char **argv)
 
 	argv0 = argv[0];
 
+	write(1, "", 0);
 	if(getenv("NOLIBTHREADDAEMONIZE") == nil)
 		_threadsetupdaemonize();
 
@@ -651,7 +652,7 @@ main(int argc, char **argv)
 	_threadsetproc(p);
 	if(mainstacksize == 0)
 		mainstacksize = 256*1024;
-	atnotify(threadinfo, 1);
+//	atnotify(threadinfo, 1);
 	_threadcreate(p, threadmainstart, nil, mainstacksize);
 	procscheduler(p);
 	sysfatal("procscheduler returned in threadmain!");

src/libthread/threadimpl.h

@@ -26,7 +26,11 @@ extern	void		makecontext(ucontext_t*, void(*)(), int, ...);
 #	define mcontext_t libthread_mcontext_t
 #	define ucontext libthread_ucontext
 #	define ucontext_t libthread_ucontext_t
-#	include "power-ucontext.h"
+#	if defined(__i386__)
+#		include "386-ucontext.h"
+#	else
+#		include "power-ucontext.h"
+#	endif
 #endif
 
 #if defined(__OpenBSD__)