[Intel-gfx] [PATCH v6 48/57] dyndbg: add .gnu.linkonce slot in vmlinux.lds.h KEEPs

Jim Cromie
2022-09-04T21:49:07Z

Add linker symbols and KEEPs for .gnu.linkonce.dyndbg and
.gnu.linkonce.dyndbg_sites sections, placing them in front of their
respective dyndbg and dyndbg_sites sections.

This placement gives us a known relative offset (ie -1) from the start
of the vector to the header, letting us use container_of to get it.
The _index added previously allows determining &descs[0] from any
desc[N].

The .gnu.linkonce. collapses possible multiple declarations into a
single allocation, with a single address.

todo: will need similar for modules.lds.h

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
---
include/asm-generic/vmlinux.lds.h | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 1e7ee65e8591..20fdea9efd78 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -348,9 +348,13 @@
__start___dyndbg_classes = .; \
KEEP(*(__dyndbg_classes)) \
__stop___dyndbg_classes = .; \
+ __dyndbg_header = .; \
+ KEEP(*(.gnu.linkonce.dyndbg)) \
__start___dyndbg = .; \
KEEP(*(__dyndbg)) \
__stop___dyndbg = .; \
+ __dyndbg_site_header = .; \
+ KEEP(*(.gnu.linkonce.dyndbg_sites)) \
__start___dyndbg_sites = .; \
KEEP(*(__dyndbg_sites)) \
__stop___dyndbg_sites = .; \
--
2.37.2