* [PATCH 1/1] doc: global data pointer on x86, x86_64
@ 2020-12-13 13:14 Heinrich Schuchardt
2020-12-15 4:00 ` Simon Glass
0 siblings, 1 reply; 2+ messages in thread
From: Heinrich Schuchardt @ 2020-12-13 13:14 UTC (permalink / raw)
To: u-boot
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>
---
doc/develop/global_data.rst | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/doc/develop/global_data.rst b/doc/develop/global_data.rst
index 9e7c8a24da..230ebcd860 100644
--- a/doc/develop/global_data.rst
+++ b/doc/develop/global_data.rst
@@ -33,8 +33,10 @@ On most architectures the global data pointer is stored in a register.
+------------+----------+
| 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
--
2.28.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH 1/1] doc: global data pointer on x86, x86_64
2020-12-13 13:14 [PATCH 1/1] doc: global data pointer on x86, x86_64 Heinrich Schuchardt
@ 2020-12-15 4:00 ` Simon Glass
0 siblings, 0 replies; 2+ messages in thread
From: Simon Glass @ 2020-12-15 4:00 UTC (permalink / raw)
To: u-boot
On Sun, 13 Dec 2020 at 06:14, Heinrich Schuchardt <xypron.glpk@gmx.de> wrote:
>
> 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>
> ---
> doc/develop/global_data.rst | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
Reviewed-by: Simon Glass <sjg@chromium.org>
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2020-12-13 13:14 [PATCH 1/1] doc: global data pointer on x86, x86_64 Heinrich Schuchardt
2020-12-15 4:00 ` Simon Glass
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