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-rw-r--r--02_process_init/entry.S4
1 files changed, 4 insertions, 0 deletions
diff --git a/02_process_init/entry.S b/02_process_init/entry.S
index 50425ba..652c175 100644
--- a/02_process_init/entry.S
+++ b/02_process_init/entry.S
@@ -2,6 +2,10 @@
#include <asm/unistd.h>
+#if !defined(__linux__) || !defined(__x86_64__)
+# error "Only supported in linux(x86_64)!"
+#endif
+
.intel_syntax noprefix
.section .text, "ax", @progbits