[cadcdev-svn-commits] [SCM] branch master updated. v2.0.0-1330-gc1410a93

[falcovorbis <fal...@us...>]

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- Log -----------------------------------------------------------------
commit c1410a93e38ab6f80efcb9400b47c8451d490d13
Author: Paul Cercueil <pa...@cr...>
Date:   Sat Apr 20 05:11:45 2024 +0200

    init: Add KOS_NO_SHUTDOWN flag to disable shutdown (#509)
    
    Serious homebrew games and apps generally don't have any way to return
    to the calling application; exiting them means rebooting the console.
    
    Those applications can now shave off a few kilobytes of RAM by using the
    KOS_NO_SHUTDOWN init flag.
    
    Signed-off-by: Paul Cercueil <pa...@cr...>
    Co-authored-by: Falco Girgis <gyr...@gm...>

-----------------------------------------------------------------------

Summary of changes:
 include/kos/init.h               |  2 ++
 kernel/libc/newlib/newlib_exit.c | 16 +++++++++++++++-
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/include/kos/init.h b/include/kos/init.h
index abb6ee9c..bb14f069 100644
--- a/include/kos/init.h
+++ b/include/kos/init.h
@@ -61,6 +61,7 @@ __BEGIN_DECLS
     KOS_INIT_FLAG(flags, INIT_FS_ROMDISK, fs_romdisk_init); \
     KOS_INIT_FLAG(flags, INIT_FS_ROMDISK, fs_romdisk_shutdown); \
     KOS_INIT_FLAG(flags, INIT_EXPORT, export_init); \
+    KOS_INIT_FLAG_NONE(flags, INIT_NO_SHUTDOWN, kos_shutdown); \
     KOS_INIT_FLAGS_ARCH(flags)
 
 #define __KOS_INIT_FLAGS_1(flags) \
@@ -138,6 +139,7 @@ extern void * __kos_romdisk;
 #define INIT_QUIET       0x00000010  /**< \brief Disable dbgio */
 #define INIT_EXPORT      0x00000020  /**< \brief Export kernel symbols */
 #define INIT_FS_ROMDISK  0x00000040  /**< \brief Enable support for romdisks */
+#define INIT_NO_SHUTDOWN 0x00000080  /**< \brief Disable hardware shutdown */
 /** @} */
 
 __END_DECLS
diff --git a/kernel/libc/newlib/newlib_exit.c b/kernel/libc/newlib/newlib_exit.c
index ff1dfeee..3ab369ca 100644
--- a/kernel/libc/newlib/newlib_exit.c
+++ b/kernel/libc/newlib/newlib_exit.c
@@ -6,9 +6,23 @@
 */
 
 #include <arch/arch.h>
+#include <stdbool.h>
 
 extern void arch_exit_handler(int ret_code) __noreturn;
 
+static int ret_code;
+
+void kos_shutdown(void)
+{
+    arch_exit_handler(ret_code);
+
+    __builtin_unreachable();
+}
+
+KOS_INIT_FLAG_WEAK(kos_shutdown, true);
+
 void _exit(int code) {
-    arch_exit_handler(code);
+    ret_code = code;
+
+    KOS_INIT_FLAG_CALL(kos_shutdown);
 }


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A pseudo Operating System for the Dreamcast.