[PATCH RFC v1 18/74] x86/link: Relocate program headers

From: Wei Liu <wei.liu2@citrix.com>
To: Xen-devel <xen-devel@lists.xenproject.org>
Cc: wei.liu2@citrix.com
Subject: [PATCH RFC v1 18/74] x86/link: Relocate program headers
Date: Thu, 4 Jan 2018 13:05:29 +0000	[thread overview]
Message-ID: <20180104130625.28605-19-wei.liu2@citrix.com> (raw)
In-Reply-To: <20180104130625.28605-1-wei.liu2@citrix.com>

From: Andrew Cooper <andrew.cooper3@citrix.com>

When the xen binary is loaded by libelf (in the future) we rely on the
elf loader to load the binary accordingly.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Signed-off-by: Wei Liu <wei.liu2@citrix.com>
---
 xen/arch/x86/xen.lds.S | 22 +++++++++++++---------
 1 file changed, 13 insertions(+), 9 deletions(-)

diff --git a/xen/arch/x86/xen.lds.S b/xen/arch/x86/xen.lds.S
index 6164ad094f..400d8a56c4 100644
--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -13,6 +13,7 @@
 #undef __XEN_VIRT_START
 #define __XEN_VIRT_START __image_base__
 #define SECTION_ALIGN MB(2)
+#define DECL_SECTION(x) x :
 
 ENTRY(efi_start)
 
@@ -20,8 +21,9 @@ ENTRY(efi_start)
 
 #define FORMAT "elf64-x86-64"
 #define SECTION_ALIGN PAGE_SIZE
+#define DECL_SECTION(x) x : AT(ADDR(x) - __XEN_VIRT_START)
 
-ENTRY(start)
+ENTRY(start_pa)
 
 #endif /* EFI */
 
@@ -56,9 +58,11 @@ SECTIONS
   __2M_text_start = .;         /* Start of 2M superpages, mapped RX. */
 #endif
 
+  start_pa = ABSOLUTE(start - __XEN_VIRT_START);
+
   . = __XEN_VIRT_START + XEN_IMG_OFFSET;
   _start = .;
-  .text : {
+  DECL_SECTION(.text) {
         _stext = .;            /* Text and read-only data */
        *(.text)
        *(.text.cold)
@@ -73,7 +77,7 @@ SECTIONS
   __2M_text_end = .;
 
   __2M_rodata_start = .;       /* Start of 2M superpages, mapped RO. */
-  .rodata : {
+  DECL_SECTION(.rodata) {
        _srodata = .;
        /* Bug frames table */
        __start_bug_frames = .;
@@ -132,13 +136,13 @@ SECTIONS
  * compiler may want to inject other things in the .note which we don't care
  * about - hence this unique name.
  */
-  .note.gnu.build-id : {
+  DECL_SECTION(.note.gnu.build-id) {
        __note_gnu_build_id_start = .;
        *(.note.gnu.build-id)
        __note_gnu_build_id_end = .;
   } :note :text
 #elif defined(BUILD_ID_EFI)
-  .buildid : {
+  DECL_SECTION(.buildid) {
        __note_gnu_build_id_start = .;
        *(.buildid)
        __note_gnu_build_id_end = .;
@@ -153,7 +157,7 @@ SECTIONS
   __2M_init_start = .;         /* Start of 2M superpages, mapped RWX (boot only). */
   . = ALIGN(PAGE_SIZE);             /* Init code and data */
   __init_begin = .;
-  .init : {
+  DECL_SECTION(.init) {
        _sinittext = .;
        *(.init.text)
        /*
@@ -215,7 +219,7 @@ SECTIONS
 
   __2M_rwdata_start = .;       /* Start of 2M superpages, mapped RW. */
   . = ALIGN(SMP_CACHE_BYTES);
-  .data.read_mostly : {
+  DECL_SECTION(.data.read_mostly) {
        *(.data.read_mostly)
        . = ALIGN(8);
        __start_schedulers_array = .;
@@ -223,7 +227,7 @@ SECTIONS
        __end_schedulers_array = .;
   } :text
 
-  .data : {                    /* Data */
+  DECL_SECTION(.data) {
        *(.data.page_aligned)
        *(.data)
        *(.data.rel)
@@ -231,7 +235,7 @@ SECTIONS
        CONSTRUCTORS
   } :text
 
-  .bss : {                     /* BSS */
+  DECL_SECTION(.bss) {
        __bss_start = .;
        *(.bss.stack_aligned)
        *(.bss.page_aligned*)
-- 
2.11.0


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