[Xen-devel] [PATCH] x86/boot: Annotate pagetables with STT_OBJECT

From: Andrew Cooper <andrew.cooper3@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Wei Liu" <wl@xen.org>, "Jan Beulich" <JBeulich@suse.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH] x86/boot: Annotate pagetables with STT_OBJECT
Date: Wed, 14 Aug 2019 11:44:04 +0100	[thread overview]
Message-ID: <20190814104404.17739-1-andrew.cooper3@citrix.com> (raw)

Introduce a new ENDDATA() helper which sets type and size together.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
---
CC: Jan Beulich <JBeulich@suse.com>
CC: Wei Liu <wl@xen.org>
CC: Roger Pau Monné <roger.pau@citrix.com>
---
 xen/arch/x86/boot/x86_64.S   | 18 +++++++++---------
 xen/include/asm-x86/config.h |  5 +++++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/xen/arch/x86/boot/x86_64.S b/xen/arch/x86/boot/x86_64.S
index 5ab24d73fc..8a4cc7e747 100644
--- a/xen/arch/x86/boot/x86_64.S
+++ b/xen/arch/x86/boot/x86_64.S
@@ -65,7 +65,7 @@ l1_identmap:
         .endif
         pfn = pfn + 1
         .endr
-        .size l1_identmap, . - l1_identmap
+ENDDATA(l1_identmap)
 
 /*
  * __page_tables_start does not cover l1_identmap because it (l1_identmap)
@@ -86,7 +86,7 @@ GLOBAL(l2_identmap)
         idx = idx + 1
         .endr
         .fill 4 * L2_PAGETABLE_ENTRIES - 8, 8, 0
-        .size l2_identmap, . - l2_identmap
+ENDDATA(l2_identmap)
 
 /*
  * L2 mapping the 1GB Xen text/data/bss region.  At boot it maps 16MB from
@@ -101,7 +101,7 @@ GLOBAL(l2_xenmap)
         idx = idx + 1
         .endr
         .fill L2_PAGETABLE_ENTRIES - 8, 8, 0
-        .size l2_xenmap, . - l2_xenmap
+ENDDATA(l2_xenmap)
 
 /* L2 mapping the fixmap.  Uses 1x 4k page. */
 l2_fixmap:
@@ -114,7 +114,7 @@ l2_fixmap:
         .endif
         idx = idx + 1
         .endr
-        .size l2_fixmap, . - l2_fixmap
+ENDDATA(l2_fixmap)
 
 /* Identity map, covering the 4 l2_identmap tables.  Uses 1x 4k page. */
 l3_identmap:
@@ -124,7 +124,7 @@ l3_identmap:
         idx = idx + 1
         .endr
         .fill L3_PAGETABLE_ENTRIES - 4, 8, 0
-        .size l3_identmap, . - l3_identmap
+ENDDATA(l3_identmap)
 
 /* L3 mapping the fixmap.  Uses 1x 4k page. */
 l3_xenmap:
@@ -139,7 +139,7 @@ l3_xenmap:
         .endif
         idx = idx + 1
         .endr
-        .size l3_xenmap, . - l3_xenmap
+ENDDATA(l3_xenmap)
 
 /* Top-level master (and idle-domain) page directory. */
 GLOBAL(idle_pg_table)
@@ -155,7 +155,7 @@ GLOBAL(idle_pg_table)
         .endif
         idx = idx + 1
         .endr
-        .size idle_pg_table, . - idle_pg_table
+ENDDATA(idle_pg_table)
 
 GLOBAL(__page_tables_end)
 
@@ -165,8 +165,8 @@ GLOBAL(__page_tables_end)
 
 GLOBAL(l2_bootmap)
         .fill 4 * L2_PAGETABLE_ENTRIES, 8, 0
-        .size l2_bootmap, . - l2_bootmap
+ENDDATA(l2_bootmap)
 
 GLOBAL(l3_bootmap)
         .fill L3_PAGETABLE_ENTRIES, 8, 0
-        .size l3_bootmap, . - l3_bootmap
+ENDDATA(l3_bootmap)
diff --git a/xen/include/asm-x86/config.h b/xen/include/asm-x86/config.h
index 22dc795eea..35705441ff 100644
--- a/xen/include/asm-x86/config.h
+++ b/xen/include/asm-x86/config.h
@@ -56,6 +56,11 @@
 #define GLOBAL(name)                            \
   .globl name;                                  \
   name:
+
+#define ENDDATA(name)                           \
+    .type name, STT_OBJECT;                     \
+    .size name, . - name
+
 #endif
 
 #define NR_hypercalls 64
-- 
2.11.0


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