x86/include/asm/linkage.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_X86_LINKAGE_H
   3 #define _ASM_X86_LINKAGE_H
   4
   5 #include <linux/stringify.h>
   6 #include <asm/ibt.h>
   7
   8 #undef notrace
   9 #define notrace __attribute__((no_instrument_function))
  10
  11 #ifdef CONFIG_64BIT
  12 /*
  13  * The generic version tends to create spurious ENDBR instructions under
  14  * certain conditions.
  15  */
  16 #define _THIS_IP_ ({ unsigned long __here; asm ("lea 0(%%rip), %0" : "=r" (__here)); __here; })
  17 #endif
  18
  19 #ifdef CONFIG_X86_32
  20 #define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
  21 #endif /* CONFIG_X86_32 */
  22
  23 #ifdef __ASSEMBLY__
  24
  25 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16)
  26 #define __ALIGN         .p2align 4, 0x90
  27 #define __ALIGN_STR     __stringify(__ALIGN)
  28 #endif
  29
  30 #if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
  31 #define RET     jmp __x86_return_thunk
  32 #else /* CONFIG_RETPOLINE */
  33 #ifdef CONFIG_SLS
  34 #define RET     ret; int3
  35 #else
  36 #define RET     ret
  37 #endif
  38 #endif /* CONFIG_RETPOLINE */
  39
  40 #else /* __ASSEMBLY__ */
  41
  42 #if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
  43 #define ASM_RET "jmp __x86_return_thunk\n\t"
  44 #else /* CONFIG_RETPOLINE */
  45 #ifdef CONFIG_SLS
  46 #define ASM_RET "ret; int3\n\t"
  47 #else
  48 #define ASM_RET "ret\n\t"
  49 #endif
  50 #endif /* CONFIG_RETPOLINE */
  51
  52 #endif /* __ASSEMBLY__ */
  53
  54 #define __CFI_TYPE(name)                                        \
  55         SYM_START(__cfi_##name, SYM_L_LOCAL, SYM_A_NONE)        \
  56         .fill 11, 1, 0x90 ASM_NL                                \
  57         .byte 0xb8 ASM_NL                                       \
  58         .long __kcfi_typeid_##name ASM_NL                       \
  59         SYM_FUNC_END(__cfi_##name)
  60
  61 /* SYM_TYPED_FUNC_START -- use for indirectly called globals, w/ CFI type */
  62 #define SYM_TYPED_FUNC_START(name)                              \
  63         SYM_TYPED_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)        \
  64         ENDBR
  65
  66 /* SYM_FUNC_START -- use for global functions */
  67 #define SYM_FUNC_START(name)                            \
  68         SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)      \
  69         ENDBR
  70
  71 /* SYM_FUNC_START_NOALIGN -- use for global functions, w/o alignment */
  72 #define SYM_FUNC_START_NOALIGN(name)                    \
  73         SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE)       \
  74         ENDBR
  75
  76 /* SYM_FUNC_START_LOCAL -- use for local functions */
  77 #define SYM_FUNC_START_LOCAL(name)                      \
  78         SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)       \
  79         ENDBR
  80
  81 /* SYM_FUNC_START_LOCAL_NOALIGN -- use for local functions, w/o alignment */
  82 #define SYM_FUNC_START_LOCAL_NOALIGN(name)              \
  83         SYM_START(name, SYM_L_LOCAL, SYM_A_NONE)        \
  84         ENDBR
  85
  86 /* SYM_FUNC_START_WEAK -- use for weak functions */
  87 #define SYM_FUNC_START_WEAK(name)                       \
  88         SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN)        \
  89         ENDBR
  90
  91 /* SYM_FUNC_START_WEAK_NOALIGN -- use for weak functions, w/o alignment */
  92 #define SYM_FUNC_START_WEAK_NOALIGN(name)               \
  93         SYM_START(name, SYM_L_WEAK, SYM_A_NONE)         \
  94         ENDBR
  95
  96 #endif /* _ASM_X86_LINKAGE_H */
  97