baremetal: get exit status working with on_exit :-)

baremetal/arch/aarch64/return1.S

@@ -0,0 +1,5 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
+.global main
+main:
+    mov x0, 1
+    ret

baremetal/arch/arm/return1.S

@@ -0,0 +1,5 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
+.global main
+main:
+    mov r0, #1
+    bx lr

baremetal/exit.c

@@ -1,6 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(void) {
-    exit(0);
-}

baremetal/exit0.c

@@ -0,0 +1,7 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
+
+#include <stdlib.h>
+
+int main(void) {
+    exit(0);
+}

baremetal/exit1.c

@@ -1,4 +1,5 @@
-#include <stdio.h>
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
+
 #include <stdlib.h>
 
 int main(void) {

baremetal/lib/aarch64.S

@@ -14,6 +14,12 @@ mystart:
     /* Prepare the stack for main, mandatory for C code. */
     ldr x0, =stack_top
     mov sp, x0
+
+    /* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
+    adr x0, lkmc_baremetal_on_exit_callback
+    bl on_exit
+
+    /* Run main. */
     bl main
 
     /* If main returns, exit. */

baremetal/lib/arm.S

@@ -1,5 +1,16 @@
+#include <lkmc.h>
+
 .global mystart
 mystart:
+    /* Prepare the stack for main, mandatory for C code. */
     ldr sp, =stack_top
+
+    /* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
+    ldr r0, =lkmc_baremetal_on_exit_callback
+    bl on_exit
+
+    /* Run main. */
     bl main
+
+    /* If main returns, exit. */
     bl exit

baremetal/return1.c

@@ -1 +1,2 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
 int main(void) { return 1; }

baremetal/return2.c

@@ -1 +1,2 @@
+/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
 int main(void) { return 2; }