From 994b7ac1697b4581b7726d2ac64321e3c840229b Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Thu, 13 Oct 2022 08:35:00 +0900 Subject: arm64: remove special treatment for the link order of head.o In the previous discussion (see the Link tag), Ard pointed out that arm/arm64/kernel/head.o does not need any special treatment - the only piece that must appear right at the start of the binary image is the image header which is emitted into .head.text. The linker script does the right thing to do. The build system does not need to manipulate the link order of head.o. Link: https://lore.kernel.org/lkml/CAMj1kXH77Ja8bSsq2Qj8Ck9iSZKw=1F8Uy-uAWGVDm4-CG=EuA@mail.gmail.com/ Suggested-by: Ard Biesheuvel Signed-off-by: Masahiro Yamada Reviewed-by: Nicolas Schier Link: https://lore.kernel.org/r/20221012233500.156764-1-masahiroy@kernel.org Signed-off-by: Will Deacon --- scripts/head-object-list.txt | 1 - 1 file changed, 1 deletion(-) (limited to 'scripts') diff --git a/scripts/head-object-list.txt b/scripts/head-object-list.txt index b16326a92c45..f226e45e3b7b 100644 --- a/scripts/head-object-list.txt +++ b/scripts/head-object-list.txt @@ -15,7 +15,6 @@ arch/alpha/kernel/head.o arch/arc/kernel/head.o arch/arm/kernel/head-nommu.o arch/arm/kernel/head.o -arch/arm64/kernel/head.o arch/csky/kernel/head.o arch/hexagon/kernel/head.o arch/ia64/kernel/head.o -- cgit v1.2.3 From 68c76ad4a9571a2b603665c85cf8229bcf04982a Mon Sep 17 00:00:00 2001 From: Ard Biesheuvel Date: Thu, 27 Oct 2022 17:59:06 +0200 Subject: arm64: unwind: add asynchronous unwind tables to kernel and modules Enable asynchronous unwind table generation for both the core kernel as well as modules, and emit the resulting .eh_frame sections as init code so we can use the unwind directives for code patching at boot or module load time. This will be used by dynamic shadow call stack support, which will rely on code patching rather than compiler codegen to emit the shadow call stack push and pop instructions. Signed-off-by: Ard Biesheuvel Reviewed-by: Nick Desaulniers Reviewed-by: Sami Tolvanen Tested-by: Sami Tolvanen Link: https://lore.kernel.org/r/20221027155908.1940624-2-ardb@kernel.org Signed-off-by: Will Deacon --- scripts/module.lds.S | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'scripts') diff --git a/scripts/module.lds.S b/scripts/module.lds.S index da4bddd26171..bf5bcf2836d8 100644 --- a/scripts/module.lds.S +++ b/scripts/module.lds.S @@ -3,6 +3,12 @@ * Archs are free to supply their own linker scripts. ld will * combine them automatically. */ +#ifdef CONFIG_UNWIND_TABLES +#define DISCARD_EH_FRAME +#else +#define DISCARD_EH_FRAME *(.eh_frame) +#endif + SECTIONS { /DISCARD/ : { *(.discard) -- cgit v1.2.3