Kernel: Replace i386 with i686

I don't really want to be working with i386 since it doesn't support
compare exchange instruction

kernel/CMakeLists.txt

@@ -4,7 +4,7 @@ project(kernel CXX C ASM)
 
 if("${BANAN_ARCH}" STREQUAL "x86_64")
 	set(ELF_FORMAT elf64-x86-64)
-elseif("${BANAN_ARCH}" STREQUAL "i386")
+elseif("${BANAN_ARCH}" STREQUAL "i686")
 	set(ELF_FORMAT elf32-i386)
 endif()
 
@@ -120,16 +120,16 @@ if("${BANAN_ARCH}" STREQUAL "x86_64")
 		${LAI_SOURCES}
 		kernel/lai_host.cpp
 	)
-elseif("${BANAN_ARCH}" STREQUAL "i386")
+elseif("${BANAN_ARCH}" STREQUAL "i686")
 	set(KERNEL_SOURCES
 		${KERNEL_SOURCES}
-		arch/i386/boot.S
-		arch/i386/GDT.cpp
-		arch/i386/IDT.cpp
-		arch/i386/PageTable.cpp
-		arch/i386/Signal.S
-		arch/i386/Syscall.S
-		arch/i386/Thread.S
+		arch/i686/boot.S
+		arch/i686/GDT.cpp
+		arch/i686/IDT.cpp
+		arch/i686/PageTable.cpp
+		arch/i686/Signal.S
+		arch/i686/Syscall.S
+		arch/i686/Thread.S
 	)
 else()
 	message(FATAL_ERROR "unsupported architecure ${BANAN_ARCH}")
@@ -182,8 +182,8 @@ if("${BANAN_ARCH}" STREQUAL "x86_64")
 	target_compile_options(kernel PUBLIC -mcmodel=kernel -mno-red-zone)
 	target_link_options(kernel PUBLIC LINKER:-z,max-page-size=4096)
 	target_link_options(kernel PUBLIC LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/x86_64/linker.ld)
-elseif("${BANAN_ARCH}" STREQUAL "i386")
-	target_link_options(kernel PUBLIC LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/i386/linker.ld)
+elseif("${BANAN_ARCH}" STREQUAL "i686")
+	target_link_options(kernel PUBLIC LINKER:-T,${CMAKE_CURRENT_SOURCE_DIR}/arch/i686/linker.ld)
 endif()
 
 target_link_options(kernel PUBLIC -ffreestanding -nostdlib)

kernel/arch/i686/Signal.S

@@ -7,6 +7,8 @@
 
 .global signal_trampoline
 signal_trampoline:
+	ud2
+
 	pushl %ebp
 	movl %esp, %ebp
 	subl $8, %esp

kernel/arch/i686/Syscall.S

@@ -1,5 +1,6 @@
 .global sys_fork_trampoline
 sys_fork_trampoline:
+	ud2
 	subl $4, %esp
 	pushl %ebx
 	pushl %ebp

kernel/include/kernel/Arch.h

@@ -1,11 +1,11 @@
 #pragma once
 
 #define x86_64 1
-#define i386   2
+#define i686   2
 
 #define ARCH(arch) (__arch == arch)
 
-#if !defined(__arch) || (__arch != x86_64 && __arch != i386)
+#if !defined(__arch) || (__arch != x86_64 && __arch != i686)
 	#error "Unsupported architecture"
 #endif
 
@@ -13,10 +13,12 @@
 	#define read_rsp(rsp) asm volatile("movq %%rsp, %0" : "=r"(rsp))
 	#define push_callee_saved() asm volatile("pushq %rbx; pushq %rbp; pushq %r12; pushq %r13; pushq %r14; pushq %r15")
 	#define pop_callee_saved()  asm volatile("popq %r15; popq %r14; popq %r13; popq %r12; popq %rbp; popq %rbx")
-#else
+#elif ARCH(i686)
 	#define read_rsp(rsp) asm volatile("movl %%esp, %0" : "=r"(rsp))
 	#define push_callee_saved() asm volatile("pushal")
 	#define pop_callee_saved() asm volatile("popal")
+#else
+	#error
 #endif
 
 #include <stdint.h>

kernel/include/kernel/FS/TmpFS/Definitions.h

@@ -28,7 +28,7 @@ namespace Kernel
 		// 1x triply indirect
 		BAN::Array<paddr_t, 5> block;
 		static constexpr size_t direct_block_count = 2;
-#elif ARCH(i386)
+#elif ARCH(i686)
 		// 14x direct blocks
 		// 1x singly indirect
 		// 1x doubly indirect

kernel/include/kernel/Memory/Types.h

@@ -4,7 +4,7 @@
 
 #if ARCH(x86_64)
 	#define KERNEL_OFFSET 0xFFFFFFFF80000000
-#elif ARCH(i386)
+#elif ARCH(i686)
 	#define KERNEL_OFFSET 0xC0000000
 #else
 	#error

kernel/include/kernel/Processor.h

@@ -19,7 +19,7 @@ namespace Kernel
 	using ProcessorID = uint32_t;
 	constexpr ProcessorID PROCESSOR_NONE = 0xFFFFFFFF;
 
-#if ARCH(x86_64) || ARCH(i386)
+#if ARCH(x86_64) || ARCH(i686)
 	class Processor
 	{
 		BAN_NON_COPYABLE(Processor);

kernel/kernel/Random.cpp

@@ -22,7 +22,7 @@ namespace Kernel
 		{
 #if ARCH(x86_64)
 			asm volatile("rdrand %0" : "=r"(s_rand_seed));
-#elif ARCH(i386)
+#elif ARCH(i686)
 			uint32_t lo, hi;
 			asm volatile(
 				"rdrand %[lo];"

kernel/kernel/Scheduler.cpp

@@ -21,7 +21,7 @@ namespace Kernel
 	{
 #if ARCH(x86_64)
 		asm volatile("movq %0, %%rsp" :: "rm"(Processor::current_stack_top()));
-#elif ARCH(i386)
+#elif ARCH(i686)
 		asm volatile("movl %0, %%esp" :: "rm"(Processor::current_stack_top()));
 #else
 		#error
@@ -221,7 +221,7 @@ namespace Kernel
 				"orq $(1 << 3), %rax;"
 				"movq %rax, %cr0"
 			);
-#elif ARCH(i386)
+#elif ARCH(i686)
 			asm volatile(
 				"movl %cr0, %eax;"
 				"orl $(1 << 3), %eax;"

kernel/kernel/Thread.cpp

@@ -111,7 +111,7 @@ namespace Kernel
 		);
 		save_sse();
 		asm volatile("movq %0, %%cr0" :: "r"(cr0));
-	#elif ARCH(i386)
+	#elif ARCH(i686)
 		uintptr_t cr0;
 		asm volatile(
 			"movl %%cr0, %%eax;"