:: commit a2e6051451968570d30ece295125887c74c9d57d

diff --git a/decompressor/main.c b/decompressor/main.c
index 1efb2b6e..bf25012f 100644
--- a/decompressor/main.c
+++ b/decompressor/main.c
@@ -1,9 +1,9 @@
 #include <stdint.h>
 #include <stddef.h>
+#include <stdnoreturn.h>
 #include <tinf.h>
 
-__attribute__((noreturn))
-void entry(uint8_t *compressed_stage2, size_t stage2_size, uint8_t boot_drive, int pxe) {
+noreturn void entry(uint8_t *compressed_stage2, size_t stage2_size, uint8_t boot_drive, int pxe) {
     // The decompressor should decompress compressed_stage2 to address 0x8000.
     uint8_t *dest = (uint8_t *)0x8000;
 
diff --git a/stage23/entry.s2.c b/stage23/entry.s2.c
index 21544b05..7a1a13b9 100644
--- a/stage23/entry.s2.c
+++ b/stage23/entry.s2.c
@@ -1,3 +1,7 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <stdnoreturn.h>
 #include <lib/term.h>
 #include <lib/real.h>
 #include <lib/blib.h>
@@ -73,8 +77,7 @@ enum {
     BOOTED_FROM_CD
 };
 
-__attribute__((noreturn))
-void entry(uint8_t boot_drive, int boot_from) {
+noreturn void entry(uint8_t boot_drive, int boot_from) {
     // XXX DO NOT MOVE A20 ENABLE CALL
     if (!a20_enable())
         panic(false, "Could not enable A20 line");
diff --git a/stage23/entry.s3.c b/stage23/entry.s3.c
index 08a4edec..875d6266 100644
--- a/stage23/entry.s3.c
+++ b/stage23/entry.s3.c
@@ -1,3 +1,6 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdnoreturn.h>
 #include <lib/term.h>
 #include <lib/real.h>
 #include <lib/blib.h>
@@ -43,8 +46,7 @@ EFI_STATUS efi_main(
 #endif
 }
 
-__attribute__((noreturn))
-void uefi_entry(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
+noreturn void uefi_entry(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
     gST = SystemTable;
     gBS = SystemTable->BootServices;
     gRT = SystemTable->RuntimeServices;
@@ -124,8 +126,7 @@ void uefi_entry(EFI_HANDLE ImageHandle, EFI_SYSTEM_TABLE *SystemTable) {
 }
 #endif
 
-__attribute__((noreturn))
-void stage3_common(void) {
+noreturn void stage3_common(void) {
     init_flush_irqs();
     init_io_apics();
 
diff --git a/stage23/lib/blib.h b/stage23/lib/blib.h
index 6b200407..ee19df71 100644
--- a/stage23/lib/blib.h
+++ b/stage23/lib/blib.h
@@ -4,6 +4,7 @@
 #include <stddef.h>
 #include <stdint.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <fs/file.h>
 #include <lib/part.h>
 #include <lib/libc.h>
@@ -48,7 +49,7 @@ int digit_to_int(char c);
 uint8_t bcd_to_int(uint8_t val);
 uint8_t int_to_bcd(uint8_t val);
 
-__attribute__((noreturn)) void panic(bool allow_menu, const char *fmt, ...);
+noreturn void panic(bool allow_menu, const char *fmt, ...);
 
 int pit_sleep_and_quit_on_keypress(int seconds);
 
@@ -80,9 +81,9 @@ void memcpy32to64(uint64_t, uint64_t, uint64_t);
 
 typedef char symbol[];
 
-__attribute__((noreturn)) void stage3_common(void);
+noreturn void stage3_common(void);
 
-__attribute__((noreturn)) void common_spinup(void *fnptr, int args, ...);
+noreturn void common_spinup(void *fnptr, int args, ...);
 
 #define no_unwind __attribute__((section(".no_unwind")))
 
diff --git a/stage23/lib/panic.s2.c b/stage23/lib/panic.s2.c
index 20149836..8c841d60 100644
--- a/stage23/lib/panic.s2.c
+++ b/stage23/lib/panic.s2.c
@@ -1,5 +1,6 @@
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <lib/print.h>
 #include <lib/real.h>
 #include <lib/trace.h>
@@ -107,7 +108,7 @@ void fallback_get_cursor_pos(size_t *x, size_t *y) {
 }
 #endif
 
-__attribute__((noreturn)) void panic(bool allow_menu, const char *fmt, ...) {
+noreturn void panic(bool allow_menu, const char *fmt, ...) {
     va_list args;
 
     va_start(args, fmt);
diff --git a/stage23/lib/real.h b/stage23/lib/real.h
index 94a150a5..07f20eab 100644
--- a/stage23/lib/real.h
+++ b/stage23/lib/real.h
@@ -2,6 +2,7 @@
 #define __LIB__REAL_H__
 
 #include <stdint.h>
+#include <stdnoreturn.h>
 
 #define rm_seg(x) ((uint16_t)(((int)x & 0xffff0) >> 4))
 #define rm_off(x) ((uint16_t)(((int)x & 0x0000f) >> 0))
@@ -28,6 +29,6 @@ struct rm_regs {
 
 void rm_int(uint8_t int_no, struct rm_regs *out_regs, struct rm_regs *in_regs);
 
-__attribute__((noreturn)) void rm_hcf(void);
+noreturn void rm_hcf(void);
 
 #endif
diff --git a/stage23/menu.c b/stage23/menu.c
index b978fd7e..a4617676 100644
--- a/stage23/menu.c
+++ b/stage23/menu.c
@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <menu.h>
 #include <lib/print.h>
 #include <lib/blib.h>
@@ -537,8 +538,8 @@ __attribute__((used))
 static uintptr_t stack_at_first_entry = 0;
 #endif
 
-__attribute__((noreturn, naked))
-void menu(__attribute__((unused)) bool timeout_enabled) {
+__attribute__((naked))
+noreturn void menu(__attribute__((unused)) bool timeout_enabled) {
 #if defined (__i386__)
     asm volatile (
         "pop %eax\n\t"
@@ -592,8 +593,8 @@ extern symbol s2_data_begin;
 extern symbol s2_data_end;
 #endif
 
-__attribute__((noreturn, used))
-static void _menu(bool timeout_enabled) {
+__attribute__((used))
+static noreturn void _menu(bool timeout_enabled) {
     size_t data_size = (uintptr_t)data_end - (uintptr_t)data_begin;
 #if bios == 1
     size_t s2_data_size = (uintptr_t)s2_data_end - (uintptr_t)s2_data_begin;
@@ -867,8 +868,7 @@ timeout_aborted:
     }
 }
 
-__attribute__((noreturn))
-void boot(char *config) {
+noreturn void boot(char *config) {
     char *cmdline = config_get_value(config, 0, "KERNEL_CMDLINE");
     if (!cmdline) {
         cmdline = config_get_value(config, 0, "CMDLINE");
diff --git a/stage23/menu.h b/stage23/menu.h
index bd0c2b67..73f8a5b5 100644
--- a/stage23/menu.h
+++ b/stage23/menu.h
@@ -2,12 +2,11 @@
 #define __MENU_H__
 
 #include <stdbool.h>
+#include <stdnoreturn.h>
 
-__attribute__((noreturn))
-void menu(bool timeout_enabled);
+noreturn void menu(bool timeout_enabled);
 
-__attribute__((noreturn))
-void boot(char *config);
+noreturn void boot(char *config);
 
 char *config_entry_editor(const char *title, const char *orig_entry);
 
diff --git a/stage23/protos/linux.32.c b/stage23/protos/linux.32.c
index c5a9daaf..ac40ce1e 100644
--- a/stage23/protos/linux.32.c
+++ b/stage23/protos/linux.32.c
@@ -1,6 +1,8 @@
+#include <stdint.h>
+#include <stdnoreturn.h>
 #include <sys/gdt.h>
 
-__attribute__((noreturn)) void linux_spinup(void *entry, void *boot_params) {
+noreturn void linux_spinup(void *entry, void *boot_params) {
     struct gdt_desc linux_gdt_descs[4];
     linux_gdt_descs[0] = (struct gdt_desc){0};
     linux_gdt_descs[1] = (struct gdt_desc){0};
diff --git a/stage23/protos/linux.c b/stage23/protos/linux.c
index 817d0bb2..9c962f8d 100644
--- a/stage23/protos/linux.c
+++ b/stage23/protos/linux.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <stddef.h>
+#include <stdnoreturn.h>
 #include <protos/linux.h>
 #include <fs/file.h>
 #include <lib/libc.h>
@@ -16,7 +17,7 @@
 #include <drivers/edid.h>
 #include <drivers/vga_textmode.h>
 
-__attribute__((noreturn)) void linux_spinup(void *entry, void *boot_params);
+noreturn void linux_spinup(void *entry, void *boot_params);
 
 // The following definitions and struct were copied and adapted from Linux
 // kernel headers released under GPL-2.0 WITH Linux-syscall-note
diff --git a/stage23/protos/multiboot1.32.c b/stage23/protos/multiboot1.32.c
index c6fda4f6..e4b77d19 100644
--- a/stage23/protos/multiboot1.32.c
+++ b/stage23/protos/multiboot1.32.c
@@ -1,13 +1,13 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <mm/vmm.h>
 #if bios == 1
 #  include <sys/idt.h>
 #endif
 
-__attribute__((noreturn)) void multiboot1_spinup_32(
-                 uint32_t entry_point, uint32_t multiboot1_info) {
+noreturn void multiboot1_spinup_32(uint32_t entry_point, uint32_t multiboot1_info) {
 #if bios == 1
     struct idtr idtr;
 
diff --git a/stage23/protos/multiboot1.c b/stage23/protos/multiboot1.c
index dbdbacca..c57b8997 100644
--- a/stage23/protos/multiboot1.c
+++ b/stage23/protos/multiboot1.c
@@ -1,5 +1,6 @@
 #include <stdint.h>
 #include <stddef.h>
+#include <stdnoreturn.h>
 #include <protos/multiboot1.h>
 #include <lib/libc.h>
 #include <lib/elf.h>
@@ -17,9 +18,7 @@
 #include <mm/pmm.h>
 #include <drivers/vga_textmode.h>
 
-__attribute__((noreturn)) void multiboot1_spinup_32(
-                 uint32_t entry_point,
-                 uint32_t multiboot1_info);
+noreturn void multiboot1_spinup_32(uint32_t entry_point, uint32_t multiboot1_info);
 
 bool multiboot1_load(char *config, char *cmdline) {
     struct file_handle *kernel_file;
diff --git a/stage23/protos/multiboot2.32.c b/stage23/protos/multiboot2.32.c
index 1991e378..c61207a2 100644
--- a/stage23/protos/multiboot2.32.c
+++ b/stage23/protos/multiboot2.32.c
@@ -1,13 +1,13 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <mm/vmm.h>
 #if bios == 1
 #  include <sys/idt.h>
 #endif
 
-__attribute__((noreturn)) void multiboot2_spinup_32(
-                 uint32_t entry_point, uint32_t multiboot2_info) {
+noreturn void multiboot2_spinup_32(uint32_t entry_point, uint32_t multiboot2_info) {
 #if bios == 1
     struct idtr idtr;
 
diff --git a/stage23/protos/multiboot2.h b/stage23/protos/multiboot2.h
index d02cfcca..5be4108d 100644
--- a/stage23/protos/multiboot2.h
+++ b/stage23/protos/multiboot2.h
@@ -24,8 +24,9 @@
 
 #include <stdint.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 
-bool multiboot2_load(char *config, char* cmdline);
+bool multiboot2_load(char *config, char *cmdline);
 
 /*  How many bytes from the start of the file we search for the header. */
 #define MULTIBOOT_SEARCH                        32768
@@ -415,7 +416,6 @@ struct multiboot_tag_load_base_addr
     uint32_t load_base_addr;
 };
 
-__attribute__((noreturn)) void multiboot2_spinup_32(
-                 uint32_t entry_point, uint32_t multiboot1_info);
+noreturn void multiboot2_spinup_32(uint32_t entry_point, uint32_t multiboot1_info);
 
 #endif
diff --git a/stage23/protos/stivale.32.c b/stage23/protos/stivale.32.c
index 17d13009..ed06a5f2 100644
--- a/stage23/protos/stivale.32.c
+++ b/stage23/protos/stivale.32.c
@@ -1,9 +1,10 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <mm/vmm.h>
 
-__attribute__((noreturn)) void stivale_spinup_32(
+noreturn void stivale_spinup_32(
                  int bits, bool level5pg, bool enable_nx, uint32_t pagemap_top_lv,
                  uint32_t entry_point_lo, uint32_t entry_point_hi,
                  uint32_t stivale_struct_lo, uint32_t stivale_struct_hi,
diff --git a/stage23/protos/stivale.c b/stage23/protos/stivale.c
index 30cf8706..8c9e9639 100644
--- a/stage23/protos/stivale.c
+++ b/stage23/protos/stivale.c
@@ -1,6 +1,7 @@
 #include <stdint.h>
 #include <stddef.h>
 #include <stdbool.h>
+#include <stdnoreturn.h>
 #include <protos/stivale.h>
 #include <lib/libc.h>
 #include <lib/elf.h>
@@ -461,13 +462,13 @@ pagemap_t stivale_build_pagemap(bool level5pg, bool unmap_null, struct elf_range
 extern symbol ImageBase;
 #endif
 
-__attribute__((noreturn)) void stivale_spinup_32(
+noreturn void stivale_spinup_32(
                  int bits, bool level5pg, uint32_t pagemap_top_lv,
                  uint32_t entry_point_lo, uint32_t entry_point_hi,
                  uint32_t stivale_struct_lo, uint32_t stivale_struct_hi,
                  uint32_t stack_lo, uint32_t stack_hi, uint32_t local_gdt);
 
-__attribute__((noreturn)) void stivale_spinup(
+noreturn void stivale_spinup(
                  int bits, bool level5pg, pagemap_t *pagemap,
                  uint64_t entry_point, uint64_t _stivale_struct, uint64_t stack,
                  bool enable_nx, uint32_t local_gdt) {
diff --git a/stage23/protos/stivale.h b/stage23/protos/stivale.h
index cb743e7c..9b7e8e67 100644
--- a/stage23/protos/stivale.h
+++ b/stage23/protos/stivale.h
@@ -3,6 +3,7 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <stdnoreturn.h>
 #include <mm/vmm.h>
 #include <lib/elf.h>
 
@@ -13,7 +14,7 @@ bool stivale_load_by_anchor(void **_anchor, const char *magic,
 pagemap_t stivale_build_pagemap(bool level5pg, bool unmap_null, struct elf_range *ranges, size_t ranges_count,
                                 bool want_fully_virtual, uint64_t physical_base, uint64_t virtual_base,
                                 uint64_t direct_map_offset);
-__attribute__((noreturn)) void stivale_spinup(
+noreturn void stivale_spinup(
                  int bits, bool level5pg, pagemap_t *pagemap,
                  uint64_t entry_point, uint64_t stivale_struct, uint64_t stack,
                  bool enable_nx, uint32_t local_gdt);