xen/flask: Drop the gen-policy.py script

The script is Python 2 specific, and fails with string/binary issues with
Python 3:

  Traceback (most recent call last):
    File "gen-policy.py", line 14, in <module>
      for char in sys.stdin.read():
    File "/usr/lib/python3.5/codecs.py", line 321, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8c in position 0: invalid start byte

Fixing the script to be compatible isn't hard, but using python here is
wasteful.  Drop the script entirely, and write an equivelent flask-policy.S
instead.  This removes the need for a $(PYTHON) and $(CC) pass.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov>
Acked-by: Julien Grall <julien@xen.org>
Release-acked-by: Juergen Gross <jgross@suse.com>

xen/include/asm-arm/asm_defns.h

@@ -21,6 +21,12 @@
 label:  .asciz msg;                             \
 .popsection
 
+#define ASM_INT(label, val)                 \
+    .p2align 2;                             \
+label: .long (val);                         \
+    .size label, . - label;                 \
+    .type label, %object
+
 #endif /* __ARM_ASM_DEFNS_H__ */
 /*
  * Local variables:

xen/include/asm-x86/asm_defns.h

@@ -386,4 +386,10 @@ static always_inline void stac(void)
 4:  .p2align 2                            ; \
     .popsection
 
+#define ASM_INT(label, val)                 \
+    .p2align 2;                             \
+label: .long (val);                         \
+    .size label, . - label;                 \
+    .type label, @object
+
 #endif /* __X86_ASM_DEFNS_H__ */

xen/xsm/flask/Makefile

@@ -27,7 +27,8 @@ $(FLASK_H_FILES): $(FLASK_H_DEPEND)
 $(AV_H_FILES): $(AV_H_DEPEND)
 	$(CONFIG_SHELL) policy/mkaccess_vector.sh $(AWK) $(AV_H_DEPEND)
 
-obj-$(CONFIG_XSM_FLASK_POLICY) += policy.o
+obj-bin-$(CONFIG_XSM_FLASK_POLICY) += flask-policy.o
+flask-policy.o: policy.bin
 
 FLASK_BUILD_DIR := $(CURDIR)
 POLICY_SRC := $(FLASK_BUILD_DIR)/xenpolicy-$(XEN_FULLVERSION)
@@ -36,9 +37,6 @@ policy.bin: FORCE
 	$(MAKE) -f $(XEN_ROOT)/tools/flask/policy/Makefile.common -C $(XEN_ROOT)/tools/flask/policy FLASK_BUILD_DIR=$(FLASK_BUILD_DIR)
 	cmp -s $(POLICY_SRC) $@ || cp $(POLICY_SRC) $@
 
-policy.c: policy.bin gen-policy.py
-	$(PYTHON) gen-policy.py < $< > $@
-
 .PHONY: clean
 clean::
 	rm -f $(ALL_H_FILES) *.o $(DEPS_RM) policy.* $(POLICY_SRC)

xen/xsm/flask/flask-policy.S

@@ -0,0 +1,16 @@
+#include <asm/asm_defns.h>
+
+        .section .init.rodata, "a", %progbits
+
+/* const unsigned char xsm_flask_init_policy[] __initconst */
+        .global xsm_flask_init_policy
+xsm_flask_init_policy:
+        .incbin "policy.bin"
+.Lend:
+
+        .type xsm_flask_init_policy, %object
+        .size xsm_flask_init_policy, . - xsm_flask_init_policy
+
+/* const unsigned int __initconst xsm_flask_init_policy_size */
+        .global xsm_flask_init_policy_size
+        ASM_INT(xsm_flask_init_policy_size, .Lend - xsm_flask_init_policy)

xen/xsm/flask/gen-policy.py

@@ -1,23 +0,0 @@
-#!/usr/bin/env python
-import sys
-
-policy_size = 0
-
-sys.stdout.write("""
-/* This file is autogenerated by gen_policy.py */
-#include <xen/init.h>
-#include <xsm/xsm.h>
-
-const unsigned char xsm_flask_init_policy[] __initconst = {
-""")
-
-for char in sys.stdin.read():
-    sys.stdout.write(" 0x%02x," % ord(char))
-    policy_size = policy_size + 1
-    if policy_size % 13 == 0:
-        sys.stdout.write("\n")
-
-sys.stdout.write("""
-};
-const unsigned int __initconst xsm_flask_init_policy_size = %d;
-""" % policy_size)