arch/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_X86_32
  12 #define asmlinkage CPP_ASMLINKAGE __attribute__((regparm(0)))
  13 #endif /* CONFIG_X86_32 */
  14
  15 #ifdef __ASSEMBLY__
  16
  17 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16)
  18 #define __ALIGN         .p2align 4, 0x90
  19 #define __ALIGN_STR     __stringify(__ALIGN)
  20 #endif
  21
  22 #if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
  23 #define RET     jmp __x86_return_thunk
  24 #else /* CONFIG_RETPOLINE */
  25 #ifdef CONFIG_SLS
  26 #define RET     ret; int3
  27 #else
  28 #define RET     ret
  29 #endif
  30 #endif /* CONFIG_RETPOLINE */
  31
  32 #else /* __ASSEMBLY__ */
  33
  34 #if defined(CONFIG_RETHUNK) && !defined(__DISABLE_EXPORTS) && !defined(BUILD_VDSO)
  35 #define ASM_RET "jmp __x86_return_thunk\n\t"
  36 #else /* CONFIG_RETPOLINE */
  37 #ifdef CONFIG_SLS
  38 #define ASM_RET "ret; int3\n\t"
  39 #else
  40 #define ASM_RET "ret\n\t"
  41 #endif
  42 #endif /* CONFIG_RETPOLINE */
  43
  44 #endif /* __ASSEMBLY__ */
  45
  46 /* SYM_FUNC_START -- use for global functions */
  47 #define SYM_FUNC_START(name)                            \
  48         SYM_START(name, SYM_L_GLOBAL, SYM_A_ALIGN)      \
  49         ENDBR
  50
  51 /* SYM_FUNC_START_NOALIGN -- use for global functions, w/o alignment */
  52 #define SYM_FUNC_START_NOALIGN(name)                    \
  53         SYM_START(name, SYM_L_GLOBAL, SYM_A_NONE)       \
  54         ENDBR
  55
  56 /* SYM_FUNC_START_LOCAL -- use for local functions */
  57 #define SYM_FUNC_START_LOCAL(name)                      \
  58         SYM_START(name, SYM_L_LOCAL, SYM_A_ALIGN)       \
  59         ENDBR
  60
  61 /* SYM_FUNC_START_LOCAL_NOALIGN -- use for local functions, w/o alignment */
  62 #define SYM_FUNC_START_LOCAL_NOALIGN(name)              \
  63         SYM_START(name, SYM_L_LOCAL, SYM_A_NONE)        \
  64         ENDBR
  65
  66 /* SYM_FUNC_START_WEAK -- use for weak functions */
  67 #define SYM_FUNC_START_WEAK(name)                       \
  68         SYM_START(name, SYM_L_WEAK, SYM_A_ALIGN)        \
  69         ENDBR
  70
  71 /* SYM_FUNC_START_WEAK_NOALIGN -- use for weak functions, w/o alignment */
  72 #define SYM_FUNC_START_WEAK_NOALIGN(name)               \
  73         SYM_START(name, SYM_L_WEAK, SYM_A_NONE)         \
  74         ENDBR
  75
  76 #endif /* _ASM_X86_LINKAGE_H */
  77