From: Nicholas Piggin <npiggin@gmail.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: Nicholas Piggin <npiggin@gmail.com>
Subject: [PATCH 1/7] powerpc/build: put sys_call_table in .data.rel.ro if RELOCATABLE
Date: Thu, 15 Sep 2022 01:47:40 +1000 [thread overview]
Message-ID: <20220914154746.1122482-2-npiggin@gmail.com> (raw)
In-Reply-To: <20220914154746.1122482-1-npiggin@gmail.com>
Const function pointers live in .data.rel.ro rather than .rodata because
they must be relocated. This change prevents powerpc/32 from generating
R_PPC_UADDR32 relocations (which are not handled). The sys_call_table is
moved to writeable memory, but a later change will move it back.
After this patch, 44x_defconfig + CONFIG_RELOCATABLE boots to busybox.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
---
arch/powerpc/kernel/systbl.S | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/arch/powerpc/kernel/systbl.S b/arch/powerpc/kernel/systbl.S
index cb3358886203..0bec33e86f50 100644
--- a/arch/powerpc/kernel/systbl.S
+++ b/arch/powerpc/kernel/systbl.S
@@ -12,7 +12,11 @@
#include <asm/ppc_asm.h>
+#ifdef CONFIG_RELOCATABLE
+.section .data.rel.ro,"aw"
+#else
.section .rodata,"a"
+#endif
#ifdef CONFIG_PPC64
.p2align 3
--
2.37.2
next prev parent reply other threads:[~2022-09-14 15:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-14 15:47 [PATCH 0/7] powerpc: build / linker improvements Nicholas Piggin
2022-09-14 15:47 ` Nicholas Piggin [this message]
2022-09-15 5:53 ` [PATCH 1/7] powerpc/build: put sys_call_table in .data.rel.ro if RELOCATABLE Christophe Leroy
2022-09-15 12:51 ` Michael Ellerman
2022-09-16 0:30 ` Nicholas Piggin
2022-09-14 15:47 ` [PATCH 2/7] powerpc: move __end_rodata to cover arch read-only sections Nicholas Piggin
2022-09-15 5:50 ` Christophe Leroy
2022-09-15 12:47 ` Michael Ellerman
2022-09-16 0:28 ` Nicholas Piggin
2022-09-16 6:35 ` Michael Ellerman
2022-09-14 15:47 ` [PATCH 3/7] powerpc/32/build: move got1/got2 sections out of text Nicholas Piggin
2022-09-14 15:47 ` [PATCH 4/7] powerpc/build: move got, toc, plt, branch_lt sections to read-only Nicholas Piggin
2022-09-14 15:47 ` [PATCH 5/7] powerpc/build: move .data.rel.ro, .sdata2 " Nicholas Piggin
2022-09-14 15:47 ` [PATCH 6/7] powerpc/64/build: only include .opd with ELFv1 Nicholas Piggin
2022-09-14 15:47 ` [PATCH 7/7] powerpc/64/build: merge .got and .toc input sections Nicholas Piggin
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