[kernel] Have process_start syscall take a list of handles

This also prompted a change of the process initialization protocol to
allow handles to get typed, and changing to marking them as just
self/other handls. This also means exposing the object type enum to
userspace.

src/kernel/objects/kobject.h

@@ -16,17 +16,9 @@ public:
 	/// Types of kernel objects.
 	enum class type : uint16_t
 	{
-		none,
-		system,
-
-		event,
-		channel,
-		endpoint,
-
-		vma,
-
-		process,
-		thread,
+#define OBJECT_TYPE( name, val ) name = val,
+#include "j6/object_types.inc"
+#undef OBJECT_TYPE
 
 		max
 	};

src/kernel/scheduler.cpp

@@ -119,27 +119,26 @@ load_process_image(const kernel::args::program *program)
 		fb_desc->flags |= 1;
 
 	j6_init_value *initv = push<j6_init_value>(tcb->rsp3);
-	initv->type = j6_init_handle_system;
-	initv->value = static_cast<uint64_t>(proc.add_handle(&system::get()));
+	initv->type = j6_init_handle_other;
+	initv->handle.type = j6_object_type_system;
+	initv->handle.handle = proc.add_handle(&system::get());
 
 	initv = push<j6_init_value>(tcb->rsp3);
-	initv->type = j6_init_handle_process;
-	initv->value = static_cast<uint64_t>(proc.self_handle());
+	initv->type = j6_init_handle_self;
+	initv->handle.type = j6_object_type_process;
+	initv->handle.handle = proc.self_handle();
 
 	initv = push<j6_init_value>(tcb->rsp3);
-	initv->type = j6_init_handle_thread;
-	initv->value = static_cast<uint64_t>(th.self_handle());
-
-	initv = push<j6_init_value>(tcb->rsp3);
-	initv->type = j6_init_handle_space;
-	//initv->value = static_cast<uint64_t>(proc.add_handle(&space));
+	initv->type = j6_init_handle_self;
+	initv->handle.type = j6_object_type_thread;
+	initv->handle.handle = th.self_handle();
 
 	initv = push<j6_init_value>(tcb->rsp3);
 	initv->type = j6_init_desc_framebuffer;
-	initv->value = reinterpret_cast<uint64_t>(fb_desc);
+	initv->data = fb_desc;
 
 	uint64_t *initc = push<uint64_t>(tcb->rsp3);
-	*initc = 5;
+	*initc = 4;
 
 	char **argv0 = push<char*>(tcb->rsp3);
 	*argv0 = message_arg;

src/kernel/syscalls/process.cpp

@@ -16,8 +16,18 @@ process_create(j6_handle_t *handle)
 }
 
 j6_status_t
-process_start(j6_handle_t *handle, uintptr_t entrypoint)
+process_start(j6_handle_t handle, uintptr_t entrypoint, j6_handle_t *handles, size_t handle_count)
 {
+	process &p = process::current();
+	process *c = get_handle<process>(handle);
+	if (handle_count && !handles)
+		return j6_err_invalid_arg;
+
+	for (size_t i = 0; i < handle_count; ++i) {
+		kobject *o = p.lookup_handle(handles[i]);
+		if (o) c->add_handle(o);
+	}
+
 	return j6_err_nyi;
 }