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91d5451d97
The __ref_stack_chk_guard symbol doesn't exist on UP: <stdin>:4:15: error: ‘__ref_stack_chk_guard’ undeclared here (not in a function) Fix the #ifdef around the entry.S export. Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Uros Bizjak <ubizjak@gmail.com> Link: https://lore.kernel.org/r/20250123190747.745588-8-brgerst@gmail.com
70 lines
1.9 KiB
ArmAsm
70 lines
1.9 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Common place for both 32- and 64-bit entry routines.
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*/
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#include <linux/export.h>
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#include <linux/linkage.h>
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#include <linux/objtool.h>
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#include <asm/msr-index.h>
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#include <asm/unwind_hints.h>
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#include <asm/segment.h>
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#include <asm/cache.h>
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#include <asm/cpufeatures.h>
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#include <asm/nospec-branch.h>
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#include "calling.h"
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.pushsection .noinstr.text, "ax"
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SYM_FUNC_START(entry_ibpb)
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ANNOTATE_NOENDBR
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movl $MSR_IA32_PRED_CMD, %ecx
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movl $PRED_CMD_IBPB, %eax
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xorl %edx, %edx
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wrmsr
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/* Make sure IBPB clears return stack preductions too. */
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FILL_RETURN_BUFFER %rax, RSB_CLEAR_LOOPS, X86_BUG_IBPB_NO_RET
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RET
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SYM_FUNC_END(entry_ibpb)
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/* For KVM */
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EXPORT_SYMBOL_GPL(entry_ibpb);
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.popsection
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/*
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* Define the VERW operand that is disguised as entry code so that
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* it can be referenced with KPTI enabled. This ensure VERW can be
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* used late in exit-to-user path after page tables are switched.
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*/
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.pushsection .entry.text, "ax"
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.align L1_CACHE_BYTES, 0xcc
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SYM_CODE_START_NOALIGN(mds_verw_sel)
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UNWIND_HINT_UNDEFINED
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ANNOTATE_NOENDBR
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.word __KERNEL_DS
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.align L1_CACHE_BYTES, 0xcc
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SYM_CODE_END(mds_verw_sel);
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/* For KVM */
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EXPORT_SYMBOL_GPL(mds_verw_sel);
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.popsection
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THUNK warn_thunk_thunk, __warn_thunk
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/*
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* Clang's implementation of TLS stack cookies requires the variable in
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* question to be a TLS variable. If the variable happens to be defined as an
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* ordinary variable with external linkage in the same compilation unit (which
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* amounts to the whole of vmlinux with LTO enabled), Clang will drop the
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* segment register prefix from the references, resulting in broken code. Work
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* around this by avoiding the symbol used in -mstack-protector-guard-symbol=
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* entirely in the C code, and use an alias emitted by the linker script
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* instead.
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*/
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#if defined(CONFIG_STACKPROTECTOR) && defined(CONFIG_SMP)
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EXPORT_SYMBOL(__ref_stack_chk_guard);
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#endif
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