system calls

src/sys/Makefile

@@ -1,5 +1,5 @@
 objects := $(patsubst %.c,%.o,$(wildcard *.c))
-subdirs := mm sched
+subdirs := mm sched syscalls
 OBJPATH=$(OBJDIR)
 export
 

src/sys/sched/scheduler.c

@@ -162,9 +162,9 @@ void sched_timerhook(arch_regs* regs){
 
 	spinlock_release(&running.lock);
 
-
+	
 	memcpy(current->regs, regs, sizeof(arch_regs));
-
+	arch_regs_saveextra(&current->extraregs);
 
 	spinlock_acquire(&currentqueue->lock);
 
@@ -198,6 +198,8 @@ static void switch_thread(thread_t* thread){
 
 	arch_setkernelstack(thread->kernelstack);
 
+	arch_regs_setupextra(&thread->extraregs);
+	
 	arch_switchcontext(thread->regs);
 	
 	__builtin_unreachable();
@@ -291,6 +293,8 @@ void sched_runinit(){
 		printf("ELF load error: %s\n", strerror(ret));
 		_panic("Could not load init", 0);
 	}
+	
+	thread->extraregs.gsbase = 0xFFFFFFFFDEADBEEF;
 
 	switch_thread(thread);
 	

src/sys/syscalls/Makefile

@@ -0,0 +1,12 @@
+objects := $(patsubst %.c,%.o,$(wildcard *.c))
+subdirs :=
+OBJPATH=$(OBJDIR)
+export
+
+all: $(subdirs) $(objects)
+	for subdir in $(subdirs) ; do $(MAKE) -C $${subdir} ; done
+
+%.o: %.c
+	$(CC) $(CFLAGS) -o $@ $<
+	mkdir -p $(OBJPATH) 
+	cp $@ $(OBJPATH)/$@

src/sys/syscalls/libclog.c

@@ -0,0 +1,29 @@
+#include <kernel/syscalls.h>
+#include <kernel/alloc.h>
+#include <errno.h>
+#include <string.h>
+#include <stdio.h>
+
+syscallret syscall_libc_log(char* str){
+	
+	syscallret ret;
+
+	char* buf = alloc(strlen(str) + 1);
+	if(!buf){
+		ret.errno = ENOMEM;
+		ret.ret = -1;
+		return ret;
+	}
+
+	strcpy(buf, str);
+
+	printf("%s", str);
+
+	ret.errno = 0;
+	ret.ret = 0;
+
+	free(buf);
+
+	return ret;
+	
+}