baremetal: implement C assert

baremetal/assert_fail.c

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

baremetal/lib/syscalls.c

@@ -13,13 +13,55 @@ enum {
 
 int _close(int file) { return -1; }
 
+void _exit(int status) {
+#if defined(GEM5)
+    LKMC_M5OPS_EXIT;
+#else
+#if defined(__arm__)
+    __asm__ __volatile__ (
+        "mov r0, #0x18\n"
+        "ldr r1, =#0x20026\n"
+        "svc 0x00123456\n"
+        :
+        :
+        : "r0", "r1"
+    );
+#elif defined(__aarch64__)
+    /* TODO actually use the exit value here, just for fun. */
+    __asm__ __volatile__ (
+        "mov x1, #0x26\n" \
+        "movk x1, #2, lsl #16\n" \
+        "str x1, [sp,#0]\n" \
+        "mov x0, #0\n" \
+        "str x0, [sp,#8]\n" \
+        "mov x1, sp\n" \
+        "mov w0, #0x18\n" \
+        "hlt 0xf000\n"
+        :
+        :
+        : "x0", "x1"
+    );
+#endif
+#endif
+}
+
 int _fstat(int file, struct stat *st) {
     st->st_mode = S_IFCHR;
     return 0;
 }
 
+/* Required by assert. */
+int _getpid(void) { return 0; }
+
+/* Required by assert. */
+int _kill(pid_t pid, int sig) {
+    exit(128 + sig);
+}
+
 int _isatty(int file) { return 1; }
+
 int _lseek(int file, int ptr, int dir) { return 0; }
+
 int _open(const char *name, int flags, int mode) { return -1; }
 
 int _read(int file, char *ptr, int len) {
@@ -61,35 +103,3 @@ int _write(int file, char *ptr, int len) {
     }
     return len;
 }
-
-void _exit(int status) {
-#if defined(GEM5)
-    LKMC_M5OPS_EXIT;
-#else
-#if defined(__arm__)
-    __asm__ __volatile__ (
-        "mov r0, #0x18\n"
-        "ldr r1, =#0x20026\n"
-        "svc 0x00123456\n"
-        :
-        :
-        : "r0", "r1"
-    );
-#elif defined(__aarch64__)
-    /* TODO actually use the exit value here, just for fun. */
-    __asm__ __volatile__ (
-        "mov x1, #0x26\n" \
-        "movk x1, #2, lsl #16\n" \
-        "str x1, [sp,#0]\n" \
-        "mov x0, #0\n" \
-        "str x0, [sp,#8]\n" \
-        "mov x1, sp\n" \
-        "mov w0, #0x18\n" \
-        "hlt 0xf000\n"
-        :
-        :
-        : "x0", "x1"
-    );
-#endif
-#endif
-}

baremetal/lkmc_assert_fail.c

@@ -1 +1 @@
-../lkmc/assert_fail.c
+../lkmc/lkmc_assert_fail.c