fixed the asm compiling bug

build.zig

@@ -7,13 +7,12 @@ pub fn build(b: *Builder) void {
     kernel.addPackagePath("arch", "src/arch/x86/lib/index.zig");
     kernel.setOutputDir("build");
 
-    // kernel.addAssemblyFile("src/arch/x86/_start.s");
+    kernel.addAssemblyFile("src/arch/x86/_start.s");
     kernel.addAssemblyFile("src/arch/x86/gdt.s");
-    // kernel.addAssemblyFile("src/arch/x86/isr.s");
+    kernel.addAssemblyFile("src/arch/x86/isr.s");
 
     kernel.setBuildMode(b.standardReleaseOptions());
     kernel.setTarget(builtin.Arch.i386, builtin.Os.freestanding, builtin.Abi.none);
     kernel.setLinkerScriptPath("src/arch/x86/linker.ld");
-
     b.default_step.dependOn(&kernel.step);
 }

src/arch/x86/_start.s

@@ -1,9 +1,9 @@
-.global _start
+.global __start
-.type _start, @function
+.type __start, @function
 
 // Entry point. It puts the machine into a consistent state,
 // starts the kernel and then waits forever.
-_start:
+__start:
     mov $0x80000, %esp  // Setup the stack.
 
     push %ebx   // Pass multiboot info structure.

src/arch/x86/gdt.s

@@ -1,6 +1,7 @@
 .type loadGDT, @function
+.global loadGDT
 
-////
+//
 // Load the GDT into the system registers.
 //
 // Arguments:

src/arch/x86/isr.s

@@ -8,6 +8,7 @@ USER_DS   = 0x23
 .macro isrGenerate n
     .align 4
     .type isr\n, @function
+    .global isr\n
 
     isr\n:
         // Push a dummy error code for interrupts that don't have one.

src/arch/x86/linker.ld

@@ -1,5 +1,5 @@
-/* ENTRY(_start) */
+ENTRY(__start)
-ENTRY(x86_main)
+/* ENTRY(x86_main) */
 /* OUTPUT_FORMAT(elf32-i386) */
 
 SECTIONS {

src/arch/x86/main.zig

@@ -1,5 +1,5 @@
-use @import("kernel").main;
+usingnamespace @import("kernel").main;
-use @import("kernel").multiboot;
+usingnamespace @import("kernel").multiboot;
 const idt = @import("idt.zig");
 const gdt = @import("gdt.zig");
 const x86 = @import("lib/index.zig");

src/main.zig

@@ -1,4 +1,4 @@
-use @import("multiboot.zig");
+usingnamespace @import("multiboot.zig");
 const pci = @import("pci.zig");
 const arch = @import("arch/x86/lib/index.zig");
 const console = @import("console.zig");