[v6,02/12] xen: add a generic way to include binary files as variables

Commit Message

Jürgen Groß Feb. 26, 2020, 12:46 p.m. UTC

Add a new script xen/tools/binfile for including a binary file at build
time being usable via a pointer and a size variable in the hypervisor.

Make use of that generic tool in xsm.

Signed-off-by: Juergen Gross <[e-mail]>
Reviewed-by: Jan Beulich <[e-mail]>
Reviewed-by: Wei Liu <[e-mail]>
---
V3:
- new patch

V4:
- add alignment parameter (Jan Beulich)
- use .Lend instead of . (Jan Beulich)
---
 .gitignore                   |  1 +
 xen/tools/binfile            | 41 +++++++++++++++++++++++++++++++++++++++++
 xen/xsm/flask/Makefile       |  5 ++++-
 xen/xsm/flask/flask-policy.S | 16 ----------------
 4 files changed, 46 insertions(+), 17 deletions(-)
 create mode 100755 xen/tools/binfile
 delete mode 100644 xen/xsm/flask/flask-policy.S

Patch

diff --git a/.gitignore b/.gitignore
index 4ca679ddbc..b2624df79a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -313,6 +313,7 @@  xen/test/livepatch/*.livepatch
 xen/tools/kconfig/.tmp_gtkcheck
 xen/tools/kconfig/.tmp_qtcheck
 xen/tools/symbols
+xen/xsm/flask/flask-policy.S
 xen/xsm/flask/include/av_perm_to_string.h
 xen/xsm/flask/include/av_permissions.h
 xen/xsm/flask/include/class_to_string.h
diff --git a/xen/tools/binfile b/xen/tools/binfile
new file mode 100755
index 0000000000..7bb35a5178
--- /dev/null
+++ b/xen/tools/binfile
@@ -0,0 +1,41 @@ 
+#!/bin/sh
+# usage: binfile [-i] [-a <align>] <target-src.S> <binary-file> <varname>
+# -a <align>  align data at 2^<align> boundary (default: byte alignment)
+# -i          add to .init.rodata (default: .rodata) section
+
+section=""
+align=0
+
+OPTIND=1
+while getopts "ia:" opt; do
+    case "$opt" in
+    i)
+        section=".init"
+        ;;
+    a)
+        align=$OPTARG
+        ;;
+    esac
+done
+
+target=$1
+binsource=$2
+varname=$3
+
+cat <<EOF >$target
+#include <asm/asm_defns.h>
+
+        .section $section.rodata, "a", %progbits
+
+        .p2align $align
+        .global $varname
+$varname:
+        .incbin "$binsource"
+.Lend:
+
+        .type $varname, %object
+        .size $varname, .Lend - $varname
+
+        .global ${varname}_size
+        ASM_INT(${varname}_size, .Lend - $varname)
+EOF
diff --git a/xen/xsm/flask/Makefile b/xen/xsm/flask/Makefile
index 7c3f381287..a807521235 100644
--- a/xen/xsm/flask/Makefile
+++ b/xen/xsm/flask/Makefile
@@ -30,6 +30,9 @@  $(AV_H_FILES): $(AV_H_DEPEND)
 obj-bin-$(CONFIG_XSM_FLASK_POLICY) += flask-policy.o
 flask-policy.o: policy.bin
 
+flask-policy.S: $(XEN_ROOT)/xen/tools/binfile
+	$(XEN_ROOT)/xen/tools/binfile -i $@ policy.bin xsm_flask_init_policy
+
 FLASK_BUILD_DIR := $(CURDIR)
 POLICY_SRC := $(FLASK_BUILD_DIR)/xenpolicy-$(XEN_FULLVERSION)
 
@@ -39,4 +42,4 @@  policy.bin: FORCE
 
 .PHONY: clean
 clean::
-	rm -f $(ALL_H_FILES) *.o $(DEPS_RM) policy.* $(POLICY_SRC)
+	rm -f $(ALL_H_FILES) *.o $(DEPS_RM) policy.* $(POLICY_SRC) flask-policy.S
diff --git a/xen/xsm/flask/flask-policy.S b/xen/xsm/flask/flask-policy.S
deleted file mode 100644
index d38aa39964..0000000000
--- a/xen/xsm/flask/flask-policy.S
+++ /dev/null
@@ -1,16 +0,0 @@ 
-#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)