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63 lines
1.6 KiB
63 lines
1.6 KiB
/* 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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#include <asm/unwind_hints.h> |
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#include <asm/frame.h> |
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.macro THUNK reg |
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.section .text.__x86.indirect_thunk |
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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_FUNC |
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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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