1 files changed, 29 insertions, 0 deletions
diff --git a/arch/um/os-Linux/util/mk_user_constants.c b/arch/um/os-Linux/util/mk_user_constants.c
new file mode 100644
index 00000000000..0933518aa8b
--- /dev/null
+++ b/arch/um/os-Linux/util/mk_user_constants.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <asm/types.h>
+/* For some reason, x86_64 nowhere defines u64 and u32, even though they're
+ * used throughout the headers.
+ */
+typedef __u64 u64;
+typedef __u32 u32;
+#include <asm/user.h>
+
+int main(int argc, char **argv)
+{
+  printf("/*\n");
+  printf(" * Generated by mk_user_constants\n");
+  printf(" */\n");
+  printf("\n");
+  printf("#ifndef __UM_USER_CONSTANTS_H\n");
+  printf("#define __UM_USER_CONSTANTS_H\n");
+  printf("\n");
+  /* I'd like to use FRAME_SIZE from ptrace.h here, but that's wrong on
+   * x86_64 (216 vs 168 bytes).  user_regs_struct is the correct size on
+   * both x86_64 and i386.
+   */
+  printf("#define UM_FRAME_SIZE %d\n", (int) sizeof(struct user_regs_struct));
+
+  printf("\n");
+  printf("#endif\n");
+
+  return(0);
+}