Add process

.gitignore

@@ -1,9 +1,10 @@
 *.o
 *.a
-*.multiboot2
 *.bin
 *.iso
 
 /config.mk
+/rootfs/boot/kernelmq.multiboot2
+/rootfs/boot/syscallproc
 /vendor/*
 !/vendor/.keep

Makefile

@@ -4,7 +4,9 @@ AR = $(CCPREFIX)ar
 AS = $(CCPREFIX)as
 CC = $(CCPREFIX)gcc
 
-KERNEL = rootfs/boot/kernelmq.multiboot2
+GRUBCFG     = rootfs/boot/grub/grub.cfg
+KERNEL      = rootfs/boot/kernelmq.multiboot2
+SYSCALLPROC = rootfs/boot/syscallproc
 
 CFLAGS = -std=gnu99 -ffreestanding -nostdinc -fno-builtin -fno-stack-protector -Wall -Wextra
 
@@ -53,20 +55,22 @@ OBJS := $(addprefix src/, $(OBJS))
 run: $(IMAGE)
 	qemu-system-i386 -cdrom $< -display none -serial stdio
 
-all: $(KERNEL)
-
 clean:
 	rm -f $(OBJS)
 	rm -f $(IMAGE)
 	rm -f $(KERNEL)
+	rm -f $(SYSCALLPROC)
 
-$(IMAGE): $(KERNEL)
+$(IMAGE): $(GRUBCFG) $(KERNEL) $(SYSCALLPROC)
 	grub-mkrescue rootfs -o $@
 
 $(KERNEL): $(OBJS)
 	$(CC) -T linker.ld -o $@ -ffreestanding -nostdlib -lgcc $^
 	grub-file --is-x86-multiboot2 $@
 
+$(SYSCALLPROC): syscallproc.asm
+	nasm -f bin syscallproc.asm -o $@
+
 %.c.o: %.c
 	$(CC) -c $< -o $@ $(CFLAGS)
 

rootfs/boot/grub/grub.cfg

@@ -1,5 +1,6 @@
 set timeout=0
 
 menuentry "KernelMQ" {
-    multiboot2 /boot/kernelmq.multiboot2 hello kernel
+    multiboot2 /boot/kernelmq.multiboot2
+    module2    /boot/syscallproc
 }

src/init.c

@@ -26,4 +26,8 @@ void init(const struct KernelMQ_Info *const kinfo_ptr)
     paging_identity(); // Still need 1:1 for lapic and video mem and such.
     paging_mapkernel(&kinfo);
     paging_load();
+
+    if (kinfo.modules_count > 0) {
+        tasks_switch_to_user(kinfo.modules[0].base);
+    }
 }

src/syscall.c

@@ -7,16 +7,18 @@ static void syscall_do_exit(struct IsrRegisters regs);
 
 void syscall_handler(const struct IsrRegisters regs)
 {
-    const unsigned int id = regs.eax;
+    const unsigned int id = regs.eax << 16 >> 16;
+
+    logger_info_from("syscall", "number %u", id);
 
     switch (id) {
         case KERNELMQ_SYSCALL_EXIT: return syscall_do_exit(regs);
     }
-
-    logger_info_from("syscall", "number %u", id);
 }
 
 void syscall_do_exit(const struct IsrRegisters regs)
 {
-    logger_warn_from("syscall", "process try to exit with error code %u, haha", regs.ebx);
+    const unsigned int exit_code = regs.ebx << 16 >> 16;
+
+    logger_warn_from("syscall", "process try to exit with error code %u, haha", exit_code);
 }

syscallproc.asm

@@ -0,0 +1,28 @@
+main:
+    xor eax, eax
+    xor ebx, ebx
+    int 0x80
+
+    xor eax, eax
+    mov ebx, 1
+    int 0x80
+
+    mov eax, 1
+    xor ebx, ebx
+    int 0x80
+
+    mov eax, 2
+    xor ebx, ebx
+    int 0x80
+
+    mov eax, 256
+    xor ebx, ebx
+    int 0x80
+
+    mov eax, 257
+    xor ebx, ebx
+    int 0x80
+
+    mov eax, 258
+    xor ebx, ebx
+    int 0x80