[Xen-devel] [PATCH v2 3/3] x86/linker: add a reloc section to ELF binary

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

if the hypervisor has been built with EFI support (ie: multiboot2).
This allows to position the .reloc section correctly in the output
binary.

Note that for the ELF output format the .reloc section is moved before
.bss for two reasons: in order for the resulting binary to not contain
any section with data after .bss, so that the file size can be smaller
than the loaded memory size, and because the data it contains is
read-only, so it belongs with the other sections containing read-only
data.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Cc: Wei Liu <wl@xxxxxxx>
---
changes sincce v1:
 - Move the .reloc section position in the output binary only for the
   ELF output format.
---
 xen/arch/x86/xen.lds.S | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 98a99444c2..19aa4332cf 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -175,6 +175,14 @@ SECTIONS
   } :text
 #endif
 #endif
+
+#if defined(XEN_BUILD_EFI) && !defined(EFI)
+  . = ALIGN(4);
+  DECL_SECTION(.reloc) {
+    *(.reloc)
+  } :text
+#endif
+
   _erodata = .;
 
   . = ALIGN(SECTION_ALIGN);
-- 
2.20.1 (Apple Git-117)


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