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3a72bd4b60
commit 76b043848f upstream.
Enable the use of -mindirect-branch=thunk-extern in newer GCC, and provide
the corresponding thunks. Provide assembler macros for invoking the thunks
in the same way that GCC does, from native and inline assembler.
This adds X86_FEATURE_RETPOLINE and sets it by default on all CPUs. In
some circumstances, IBRS microcode features may be used instead, and the
retpoline can be disabled.
On AMD CPUs if lfence is serialising, the retpoline can be dramatically
simplified to a simple "lfence; jmp *\reg". A future patch, after it has
been verified that lfence really is serialising in all circumstances, can
enable this by setting the X86_FEATURE_RETPOLINE_AMD feature bit in addition
to X86_FEATURE_RETPOLINE.
Do not align the retpoline in the altinstr section, because there is no
guarantee that it stays aligned when it's copied over the oldinstr during
alternative patching.
[ Andi Kleen: Rename the macros, add CONFIG_RETPOLINE option, export thunks]
[ tglx: Put actual function CALL/JMP in front of the macros, convert to
symbolic labels ]
[ dwmw2: Convert back to numeric labels, merge objtool fixes ]
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: gnomes@lxorguk.ukuu.org.uk
Cc: Rik van Riel <riel@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: thomas.lendacky@amd.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: Kees Cook <keescook@google.com>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linux-foundation.org>
Cc: Paul Turner <pjt@google.com>
Link: https://lkml.kernel.org/r/1515707194-20531-4-git-send-email-dwmw@amazon.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
43 lines
965 B
C
43 lines
965 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <asm/ftrace.h>
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#include <linux/uaccess.h>
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#include <asm/string.h>
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#include <asm/page.h>
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#include <asm/checksum.h>
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#include <asm-generic/asm-prototypes.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/special_insns.h>
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#include <asm/preempt.h>
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#include <asm/asm.h>
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#ifndef CONFIG_X86_CMPXCHG64
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extern void cmpxchg8b_emu(void);
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#endif
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#ifdef CONFIG_RETPOLINE
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#ifdef CONFIG_X86_32
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#define INDIRECT_THUNK(reg) extern asmlinkage void __x86_indirect_thunk_e ## reg(void);
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#else
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#define INDIRECT_THUNK(reg) extern asmlinkage void __x86_indirect_thunk_r ## reg(void);
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INDIRECT_THUNK(8)
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INDIRECT_THUNK(9)
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INDIRECT_THUNK(10)
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INDIRECT_THUNK(11)
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INDIRECT_THUNK(12)
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INDIRECT_THUNK(13)
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INDIRECT_THUNK(14)
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INDIRECT_THUNK(15)
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#endif
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INDIRECT_THUNK(ax)
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INDIRECT_THUNK(bx)
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INDIRECT_THUNK(cx)
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INDIRECT_THUNK(dx)
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INDIRECT_THUNK(si)
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INDIRECT_THUNK(di)
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INDIRECT_THUNK(bp)
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INDIRECT_THUNK(sp)
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#endif /* CONFIG_RETPOLINE */
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