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c7acee3d2f
Christophe Leroy reported that commit7b4537199a("kbuild: link symbol CRCs at final link, removing CONFIG_MODULE_REL_CRCS") broke mpc85xx_defconfig + CONFIG_RELOCATABLE=y. LD vmlinux SYSMAP System.map SORTTAB vmlinux CHKREL vmlinux WARNING: 451 bad relocations c0b312a9 R_PPC_UADDR32 .head.text-0x3ff9ed54 c0b312ad R_PPC_UADDR32 .head.text-0x3ffac224 c0b312b1 R_PPC_UADDR32 .head.text-0x3ffb09f4 c0b312b5 R_PPC_UADDR32 .head.text-0x3fe184dc c0b312b9 R_PPC_UADDR32 .head.text-0x3fe183a8 ... The compiler emits a bunch of R_PPC_UADDR32, which is not supported by arch/powerpc/kernel/reloc_32.S. The reason is there exists an unaligned symbol. $ powerpc-linux-gnu-nm -n vmlinux ... c0b31258 d spe_aligninfo c0b31298 d __func__.0 c0b312a9 D sys_call_table c0b319b8 d __func__.0 Commit7b4537199ais not the root cause. Even before that, I can reproduce the same issue for mpc85xx_defconfig + CONFIG_RELOCATABLE=y + CONFIG_MODVERSIONS=n. It is just that nobody noticed because when CONFIG_MODVERSIONS is enabled, a __crc_* symbol inserted before sys_call_table was hiding the unalignment issue. Adding alignment to the syscall table for ppc32 fixes the issue. Cc: stable@vger.kernel.org Reported-by: Christophe Leroy <christophe.leroy@csgroup.eu> Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Tested-by: Christophe Leroy <christophe.leroy@csgroup.eu> [mpe: Trim change log discussion, add Cc stable] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/lkml/38605f6a-a568-f884-f06f-ea4da5b214f0@csgroup.eu/ Link: https://lore.kernel.org/r/20220820165129.1147589-1-masahiroy@kernel.org
41 lines
1 KiB
ArmAsm
41 lines
1 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* This file contains the table of syscall-handling functions.
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* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
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*
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* Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
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* and Paul Mackerras.
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*
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* Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
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* PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
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*/
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#include <asm/ppc_asm.h>
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.section .rodata,"a"
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#ifdef CONFIG_PPC64
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.p2align 3
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#define __SYSCALL(nr, entry) .8byte entry
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#else
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.p2align 2
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#define __SYSCALL(nr, entry) .long entry
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#endif
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#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, native)
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.globl sys_call_table
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sys_call_table:
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#ifdef CONFIG_PPC64
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#include <asm/syscall_table_64.h>
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#else
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#include <asm/syscall_table_32.h>
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#endif
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#ifdef CONFIG_COMPAT
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#undef __SYSCALL_WITH_COMPAT
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#define __SYSCALL_WITH_COMPAT(nr, native, compat) __SYSCALL(nr, compat)
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.globl compat_sys_call_table
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compat_sys_call_table:
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#define compat_sys_sigsuspend sys_sigsuspend
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#include <asm/syscall_table_32.h>
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#endif
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