baremetal: build userland/ programs using baremetal path property instead of symlinks

Otherwise I'll go crazy with symlink action.

baremetal/arch/aarch64/no_bootloader/gem5_exit.S

@@ -1,5 +1,5 @@
 #include <lkmc/m5ops.h>
 
-.global mystart
-mystart:
+.global lkmc_start
+lkmc_start:
     LKMC_M5OPS_EXIT_ASM

baremetal/arch/aarch64/no_bootloader/semihost_exit.S

@@ -1,7 +1,7 @@
 /* https://github.com/cirosantilli/linux-kernel-module-cheat#semihosting */
 
-.global mystart
-mystart:
+.global lkmc_start
+lkmc_start:
     mov x1, 0x26
     movk x1, 2, lsl 16
     ldr x2, =semihost_args

baremetal/arch/arm/no_bootloader/gem5_exit.S

@@ -1,3 +1,3 @@
-.global mystart
-mystart:
+.global lkmc_start
+lkmc_start:
     mov r0, #0; mov r1, #0; .inst 0xEE000110 | (0x21 << 16);

baremetal/arch/arm/no_bootloader/semihost_exit.S

@@ -1,5 +1,5 @@
-.global mystart
-mystart:
+.global lkmc_start
+lkmc_start:
     mov r0, #0x18
     ldr r1, =#0x20026
     svc 0x00123456

baremetal/c/add.c

@@ -1 +0,0 @@
-../../lkmc/c/add.c

baremetal/c/add.py

@@ -1 +0,0 @@
-../../lkmc/c/add.py

baremetal/c/assert_fail.c

@@ -1 +0,0 @@
-../../lkmc/c/assert_fail.c

baremetal/c/hello.c

@@ -1 +0,0 @@
-../../lkmc/c/hello.c

baremetal/c/infinite_loop.c

@@ -1 +0,0 @@
-../../lkmc/c/infinite_loop.c

baremetal/c/stderr.c

@@ -1 +0,0 @@
-../../lkmc/c/stderr.c

baremetal/exit0.c

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

baremetal/exit1.c

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

baremetal/lib/aarch64.S

@@ -1,7 +1,7 @@
 #include <lkmc.h>
 
-.global mystart
-mystart:
+.global lkmc_start
+lkmc_start:
     /* = NEON setup */
     mov x1, #(0x3 << 20)
     msr cpacr_el1, x1
@@ -20,6 +20,7 @@ mystart:
     bl on_exit
 
     /* Run main. */
+    mov x0, 0
     bl main
 
     /* If main returns, exit. */

baremetal/lib/arm.S

@@ -1,7 +1,7 @@
 #include <lkmc.h>
 
-.global mystart
-mystart:
+.global lkmc_start
+lkmc_start:
     /* Prepare the stack for main, mandatory for C code. */
     ldr sp, =stack_top
 
@@ -10,6 +10,7 @@ mystart:
     bl on_exit
 
     /* Run main. */
+    mov r0, 0
     bl main
 
     /* If main returns, exit. */

baremetal/lib/syscalls.c

@@ -5,6 +5,13 @@
 #include <lkmc.h>
 #include <lkmc/m5ops.h>
 
+void lkmc_baremetal_on_exit_callback(int status, void *arg) {
+    (void)arg;
+    if (status != 0) {
+        printf("lkmc_exit_status_%d\n", status);
+    }
+}
+
 enum {
     UART_FR_RXFE = 0x10,
 };

baremetal/link.ld

@@ -1,4 +1,4 @@
-ENTRY(mystart)
+ENTRY(lkmc_start)
 SECTIONS
 {
   .text : {

baremetal/out_of_memory.c

@@ -1,18 +0,0 @@
-/* Test out of memory. */
-
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(void) {
-    char *ptr = NULL;
-    size_t alloc_size = 1;
-    while (1) {
-        ptr = realloc(ptr, alloc_size);
-        if (ptr == NULL) {
-            puts("out of memory");
-            break;
-        } else {
-            alloc_size <<= 1;
-        }
-    }
-}

baremetal/return.c

@@ -1 +0,0 @@
-int main(void) { return 0; }

baremetal/return1.c

@@ -1,2 +0,0 @@
-/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
-int main(void) { return 1; }

baremetal/return2.c

@@ -1,2 +0,0 @@
-/* https://github.com/cirosantilli/linux-kernel-module-cheat#magic-failure-string */
-int main(void) { return 2; }