doc: global data pointer on x86, x86_64
On x86 the global data pointer is stored in register fs.
On x86_64 no register is used for the global data pointer.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/develop/global_data.rst b/doc/develop/global_data.rst
index 9e7c8a2..230ebcd 100644
--- a/doc/develop/global_data.rst
+++ b/doc/develop/global_data.rst
@@ -33,8 +33,10 @@
+------------+----------+
| SuperH | r13 |
+------------+----------+
+| x86 32bit | fs |
++------------+----------+
-The sandbox, x86, and Xtensa are notable exceptions.
+The sandbox, x86_64, and Xtensa are notable exceptions.
Clang for ARM does not support assigning a global register. When using Clang
gd is defined as an inline function using assembly code. This adds a few bytes