From 7e065cd57392772b2ec20388f9cacc1c828995e9 Mon Sep 17 00:00:00 2001
From: Johann <johannkoenig@google.com>
Date: Wed, 17 Feb 2016 18:21:03 -0800
Subject: [PATCH] Copy PIC handling code from x86_abi_support

Change-Id: Ia05fe78d2bd29b6aebaf6605719fe8a32528f25c
---
 third_party/x86inc/README.libvpx |  1 +
 third_party/x86inc/x86inc.asm    | 94 ++++++++++++++++++++++++++++----
 2 files changed, 84 insertions(+), 11 deletions(-)

diff --git a/third_party/x86inc/README.libvpx b/third_party/x86inc/README.libvpx
index 2a75c4ad1..6fe3429d6 100644
--- a/third_party/x86inc/README.libvpx
+++ b/third_party/x86inc/README.libvpx
@@ -14,3 +14,4 @@ Manage name mangling (prefixing with '_') manually because 'PREFIX' does not
   exist in libvpx.
 Expand PIC default to macho64 and respect CONFIG_PIC from libvpx
 Set 'private_extern' visibility for macho targets.
+Copy PIC 'GLOBAL' macros from x86_abi_support.asm
diff --git a/third_party/x86inc/x86inc.asm b/third_party/x86inc/x86inc.asm
index 112e37288..e28348eef 100644
--- a/third_party/x86inc/x86inc.asm
+++ b/third_party/x86inc/x86inc.asm
@@ -101,21 +101,93 @@
     SECTION .rodata align=%1
 %endmacro
 
-%if WIN64
-    %define PIC
-%elifidn __OUTPUT_FORMAT__,macho64
-    %define PIC
-%elif ARCH_X86_64 == 0
-; x86_32 doesn't require PIC.
-; Some distros prefer shared objects to be PIC, but nothing breaks if
-; the code contains a few textrels, so we'll skip that complexity.
-    %undef PIC
-%elif CONFIG_PIC
-    %define PIC
+; PIC macros are copied from vpx_ports/x86_abi_support.asm. The "define PIC"
+; from original code is added in for 64bit.
+%ifidn __OUTPUT_FORMAT__,elf32
+%define ABI_IS_32BIT 1
+%elifidn __OUTPUT_FORMAT__,macho32
+%define ABI_IS_32BIT 1
+%elifidn __OUTPUT_FORMAT__,win32
+%define ABI_IS_32BIT 1
+%elifidn __OUTPUT_FORMAT__,aout
+%define ABI_IS_32BIT 1
+%else
+%define ABI_IS_32BIT 0
 %endif
+
+%if ABI_IS_32BIT
+    %if CONFIG_PIC=1
+        %ifidn __OUTPUT_FORMAT__,elf32
+            %define GET_GOT_DEFINED 1
+            %define WRT_PLT wrt ..plt
+            %macro GET_GOT 1
+                extern _GLOBAL_OFFSET_TABLE_
+                push %1
+                call %%get_got
+                %%sub_offset:
+                jmp %%exitGG
+                %%get_got:
+                mov %1, [esp]
+                add %1, _GLOBAL_OFFSET_TABLE_ + $$ - %%sub_offset wrt ..gotpc
+                ret
+                %%exitGG:
+                %undef GLOBAL
+                %define GLOBAL(x) x + %1 wrt ..gotoff
+                %undef RESTORE_GOT
+                %define RESTORE_GOT pop %1
+            %endmacro
+        %elifidn __OUTPUT_FORMAT__,macho32
+            %define GET_GOT_DEFINED 1
+            %macro GET_GOT 1
+                push %1
+                call %%get_got
+                %%get_got:
+                pop  %1
+                %undef GLOBAL
+                %define GLOBAL(x) x + %1 - %%get_got
+                %undef RESTORE_GOT
+                %define RESTORE_GOT pop %1
+            %endmacro
+        %else
+            %define GET_GOT_DEFINED 0
+        %endif
+    %endif
+
+    %if ARCH_X86_64 == 0
+        %undef PIC
+    %endif
+
+%else
+    %macro GET_GOT 1
+    %endmacro
+    %define GLOBAL(x) rel x
+    %define WRT_PLT wrt ..plt
+
+    %if WIN64
+        %define PIC
+    %elifidn __OUTPUT_FORMAT__,macho64
+        %define PIC
+    %elif CONFIG_PIC
+        %define PIC
+    %endif
+%endif
+
+%ifnmacro GET_GOT
+    %macro GET_GOT 1
+    %endmacro
+    %define GLOBAL(x) x
+%endif
+%ifndef RESTORE_GOT
+    %define RESTORE_GOT
+%endif
+%ifndef WRT_PLT
+    %define WRT_PLT
+%endif
+
 %ifdef PIC
     default rel
 %endif
+; Done with PIC macros
 
 %ifdef __NASM_VER__
     %use smartalign