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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1df37383a8
It doesn't make sense to have an indirect call thunk with esp/rsp as
retpoline code won't work correctly with the stack pointer register.
Removing it will help compiler writers to catch error in case such
a thunk call is emitted incorrectly.
Fixes: 76b043848f ("x86/retpoline: Add initial retpoline support")
Suggested-by: Jeff Law <law@redhat.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: David Woodhouse <dwmw@amazon.co.uk>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Kees Cook <keescook@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Link: https://lkml.kernel.org/r/1516658974-27852-1-git-send-email-longman@redhat.com
49 lines
1.2 KiB
ArmAsm
49 lines
1.2 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/stringify.h>
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#include <linux/linkage.h>
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#include <asm/dwarf2.h>
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#include <asm/cpufeatures.h>
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#include <asm/alternative-asm.h>
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#include <asm/export.h>
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#include <asm/nospec-branch.h>
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.macro THUNK reg
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.section .text.__x86.indirect_thunk
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ENTRY(__x86_indirect_thunk_\reg)
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CFI_STARTPROC
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JMP_NOSPEC %\reg
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CFI_ENDPROC
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ENDPROC(__x86_indirect_thunk_\reg)
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.endm
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/*
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* Despite being an assembler file we can't just use .irp here
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* because __KSYM_DEPS__ only uses the C preprocessor and would
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* only see one instance of "__x86_indirect_thunk_\reg" rather
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* than one per register with the correct names. So we do it
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* the simple and nasty way...
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*/
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#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym)
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#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg)
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#define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg)
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GENERATE_THUNK(_ASM_AX)
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GENERATE_THUNK(_ASM_BX)
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GENERATE_THUNK(_ASM_CX)
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GENERATE_THUNK(_ASM_DX)
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GENERATE_THUNK(_ASM_SI)
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GENERATE_THUNK(_ASM_DI)
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GENERATE_THUNK(_ASM_BP)
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#ifdef CONFIG_64BIT
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GENERATE_THUNK(r8)
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GENERATE_THUNK(r9)
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GENERATE_THUNK(r10)
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GENERATE_THUNK(r11)
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GENERATE_THUNK(r12)
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GENERATE_THUNK(r13)
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GENERATE_THUNK(r14)
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GENERATE_THUNK(r15)
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#endif
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