diff options
Diffstat (limited to 'arch/x86/lib/retpoline.S')
| -rw-r--r-- | arch/x86/lib/retpoline.S | 63 |
1 files changed, 39 insertions, 24 deletions
diff --git a/arch/x86/lib/retpoline.S b/arch/x86/lib/retpoline.S index 363ec132df7e..b4c43a9b1483 100644 --- a/arch/x86/lib/retpoline.S +++ b/arch/x86/lib/retpoline.S @@ -7,15 +7,31 @@ #include <asm/alternative-asm.h> #include <asm/export.h> #include <asm/nospec-branch.h> +#include <asm/unwind_hints.h> +#include <asm/frame.h> .macro THUNK reg .section .text.__x86.indirect_thunk + .align 32 SYM_FUNC_START(__x86_indirect_thunk_\reg) - CFI_STARTPROC - JMP_NOSPEC %\reg - CFI_ENDPROC + JMP_NOSPEC \reg SYM_FUNC_END(__x86_indirect_thunk_\reg) + +SYM_FUNC_START_NOALIGN(__x86_retpoline_\reg) + ANNOTATE_INTRA_FUNCTION_CALL + call .Ldo_rop_\@ +.Lspec_trap_\@: + UNWIND_HINT_EMPTY + pause + lfence + jmp .Lspec_trap_\@ +.Ldo_rop_\@: + mov %\reg, (%_ASM_SP) + UNWIND_HINT_RET_OFFSET + ret +SYM_FUNC_END(__x86_retpoline_\reg) + .endm /* @@ -24,25 +40,24 @@ SYM_FUNC_END(__x86_indirect_thunk_\reg) * only see one instance of "__x86_indirect_thunk_\reg" rather * than one per register with the correct names. So we do it * the simple and nasty way... + * + * Worse, you can only have a single EXPORT_SYMBOL per line, + * and CPP can't insert newlines, so we have to repeat everything + * at least twice. */ -#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym) -#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg) -#define GENERATE_THUNK(reg) THUNK reg ; EXPORT_THUNK(reg) - -GENERATE_THUNK(_ASM_AX) -GENERATE_THUNK(_ASM_BX) -GENERATE_THUNK(_ASM_CX) -GENERATE_THUNK(_ASM_DX) -GENERATE_THUNK(_ASM_SI) -GENERATE_THUNK(_ASM_DI) -GENERATE_THUNK(_ASM_BP) -#ifdef CONFIG_64BIT -GENERATE_THUNK(r8) -GENERATE_THUNK(r9) -GENERATE_THUNK(r10) -GENERATE_THUNK(r11) -GENERATE_THUNK(r12) -GENERATE_THUNK(r13) -GENERATE_THUNK(r14) -GENERATE_THUNK(r15) -#endif + +#define __EXPORT_THUNK(sym) _ASM_NOKPROBE(sym); EXPORT_SYMBOL(sym) +#define EXPORT_THUNK(reg) __EXPORT_THUNK(__x86_indirect_thunk_ ## reg) +#define EXPORT_RETPOLINE(reg) __EXPORT_THUNK(__x86_retpoline_ ## reg) + +#undef GEN +#define GEN(reg) THUNK reg +#include <asm/GEN-for-each-reg.h> + +#undef GEN +#define GEN(reg) EXPORT_THUNK(reg) +#include <asm/GEN-for-each-reg.h> + +#undef GEN +#define GEN(reg) EXPORT_RETPOLINE(reg) +#include <asm/GEN-for-each-reg.h> |