2021-05-26 19:09:36 +00:00
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/* 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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2021-09-23 16:59:15 +00:00
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#include <asm/alternative-asm.h>
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2021-05-26 19:09:36 +00:00
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#include <asm/export.h>
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#include <asm/nospec-branch.h>
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#include <asm/unwind_hints.h>
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#include <asm/frame.h>
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2021-09-23 16:59:15 +00:00
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.macro THUNK reg
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2021-05-26 19:09:36 +00:00
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.section .text.__x86.indirect_thunk
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2021-09-23 16:59:15 +00:00
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.align 32
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SYM_FUNC_START(__x86_indirect_thunk_\reg)
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JMP_NOSPEC \reg
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SYM_FUNC_END(__x86_indirect_thunk_\reg)
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SYM_FUNC_START_NOALIGN(__x86_retpoline_\reg)
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ANNOTATE_INTRA_FUNCTION_CALL
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call .Ldo_rop_\@
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.Lspec_trap_\@:
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UNWIND_HINT_EMPTY
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pause
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lfence
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jmp .Lspec_trap_\@
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.Ldo_rop_\@:
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mov %\reg, (%_ASM_SP)
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UNWIND_HINT_RET_OFFSET
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ret
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SYM_FUNC_END(__x86_retpoline_\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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* Worse, you can only have a single EXPORT_SYMBOL per line,
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* and CPP can't insert newlines, so we have to repeat everything
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* at least twice.
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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 EXPORT_RETPOLINE(reg) __EXPORT_THUNK(__x86_retpoline_ ## reg)
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#undef GEN
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#define GEN(reg) THUNK reg
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#include <asm/GEN-for-each-reg.h>
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#undef GEN
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#define GEN(reg) EXPORT_THUNK(reg)
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#include <asm/GEN-for-each-reg.h>
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#undef GEN
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#define GEN(reg) EXPORT_RETPOLINE(reg)
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#include <asm/GEN-for-each-reg.h>
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