add panicking from assembly

kernel/Makefile

@@ -34,7 +34,7 @@ bin/$(TARGET)-$(ARCH): $(OBJ)
 	@echo Linking $@
 	$(LD) $(LDFLAGS) $(OBJ) -o $@
 
-obj/$(ARCH)/%.c.o: src/%.c $(HFILES)
+obj/$(ARCH)/%.c.o: src/%.c $(HFILES) $(ARCHHEADERS)
 	@mkdir -p $(@D)
 	@echo $(CC) $<
 	@$(CC) $(CFLAGS) -c $< -o $@

kernel/make/x86/make.config

@@ -1,9 +1,13 @@
 ARCHFILES   := $(shell find src/arch/x86 -type f -name '*.c' -print) \
-				$(shell find src/arch/x86 -type f -name '*.nasm' -print) \
-				$(shell find src/arch/$(ARCH) -type f -name '*.nasm' -print)
+			   $(shell find src/arch/x86 -type f -name '*.nasm' -print) \
+			   $(shell find src/arch/$(ARCH) -type f -name '*.nasm' -print)
+ARCHHEADERS := $(shell find src/arch/x86 -type f -name '*.h' -print) \
+			   $(shell find src/arch/x86 -type f -name '*.nasminc' -print) \
+			   $(shell find src/arch/$(ARCH) -type f -name '*.nasminc' -print)
 ARCH_CFLAGS := -masm=intel
+NASMFLAGS := -Isrc
 
-obj/$(ARCH)/%.nasm.o: src/%.nasm
+obj/$(ARCH)/%.nasm.o: src/%.nasm $(ARCHHEADERS)
 	@mkdir -p $(@D)
 	@echo nasm $<
 	@$(NASM) $(NASMFLAGS) $< -o $@

kernel/src/arch/x86_64/entry-stivale2.c

@@ -13,6 +13,8 @@
 static uint8_t stack[4096] = {0};
 void stivale2_main(struct stivale2_struct *info);
 
+extern void asmpanic();
+
 struct stivale2_header_tag_smp smp_request = {
     .tag = {
         .identifier = STIVALE2_HEADER_TAG_SMP_ID,
@@ -48,10 +50,10 @@ void stivale2_main(struct stivale2_struct *info) {
     __asm__ __volatile__("sgdt %0" : : "m"(pGDT) : "memory");
     printf("GDT: %x (%d)\n", pGDT.base, pGDT.limit);
     for(int i = 0; i < (pGDT.limit+1)/8; i++) {
-        uint64_t *gdt_ent = pGDT.base + 8*i;
+        uint64_t *gdt_ent = (uint64_t*)(pGDT.base + 8*i);
         printf("GDT %d: ", i); print_gdt_ent(gdt_ent); putchar('\n');
     }
 
-	char *argv[3] = {"stivale2", info->bootloader_brand, info->bootloader_version};
-    kmain(3, argv);
+    asmpanic();
+    kmain();
 }

kernel/src/arch/x86_64/info.nasm

@@ -1,2 +1,8 @@
+%include "arch/x86_64/panic.nasminc"
+
 global archval
-archval db "x86_64-nasm", 0
+archval db "x86_64-nasm", 0
+
+global asmpanic
+asmpanic:
+    PANIC "asmpanic"

kernel/src/arch/x86_64/panic.nasminc

@@ -0,0 +1,17 @@
+%ifndef PANIC_NASM_MAC
+    %define PANIC_NASM_MAC
+
+    extern panic
+
+    %macro PANIC 1
+    [SECTION .data]
+        panicval db  %1, 0
+        filename db __FILE__, 0
+    __SECT__
+        mov rdi, panicval
+        mov rsi, filename
+        mov rdx, __LINE__
+        call panic
+    %endmacro
+%endif
+