arch/loongarch/include/asm/asm-extable.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 #ifndef __ASM_ASM_EXTABLE_H
   3 #define __ASM_ASM_EXTABLE_H
   4
   5 #define EX_TYPE_NONE                    0
   6 #define EX_TYPE_FIXUP                   1
   7 #define EX_TYPE_UACCESS_ERR_ZERO        2
   8 #define EX_TYPE_BPF                     3
   9
  10 #ifdef __ASSEMBLY__
  11
  12 #define __ASM_EXTABLE_RAW(insn, fixup, type, data)      \
  13         .pushsection    __ex_table, "a";                \
  14         .balign         4;                              \
  15         .long           ((insn) - .);                   \
  16         .long           ((fixup) - .);                  \
  17         .short          (type);                         \
  18         .short          (data);                         \
  19         .popsection;
  20
  21         .macro          _asm_extable, insn, fixup
  22         __ASM_EXTABLE_RAW(\insn, \fixup, EX_TYPE_FIXUP, 0)
  23         .endm
  24
  25 #else /* __ASSEMBLY__ */
  26
  27 #include <linux/bits.h>
  28 #include <linux/stringify.h>
  29 #include <asm/gpr-num.h>
  30
  31 #define __ASM_EXTABLE_RAW(insn, fixup, type, data)      \
  32         ".pushsection   __ex_table, \"a\"\n"            \
  33         ".balign        4\n"                            \
  34         ".long          ((" insn ") - .)\n"             \
  35         ".long          ((" fixup ") - .)\n"            \
  36         ".short         (" type ")\n"                   \
  37         ".short         (" data ")\n"                   \
  38         ".popsection\n"
  39
  40 #define _ASM_EXTABLE(insn, fixup)       \
  41         __ASM_EXTABLE_RAW(#insn, #fixup, __stringify(EX_TYPE_FIXUP), "0")
  42
  43 #define EX_DATA_REG_ERR_SHIFT   0
  44 #define EX_DATA_REG_ERR         GENMASK(4, 0)
  45 #define EX_DATA_REG_ZERO_SHIFT  5
  46 #define EX_DATA_REG_ZERO        GENMASK(9, 5)
  47
  48 #define EX_DATA_REG(reg, gpr)                                           \
  49         "((.L__gpr_num_" #gpr ") << " __stringify(EX_DATA_REG_##reg##_SHIFT) ")"
  50
  51 #define _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)           \
  52         __DEFINE_ASM_GPR_NUMS                                           \
  53         __ASM_EXTABLE_RAW(#insn, #fixup,                                \
  54                           __stringify(EX_TYPE_UACCESS_ERR_ZERO),        \
  55                           "("                                           \
  56                             EX_DATA_REG(ERR, err) " | "                 \
  57                             EX_DATA_REG(ZERO, zero)                     \
  58                           ")")
  59
  60 #define _ASM_EXTABLE_UACCESS_ERR(insn, fixup, err)                      \
  61         _ASM_EXTABLE_UACCESS_ERR_ZERO(insn, fixup, err, zero)
  62
  63 #endif /* __ASSEMBLY__ */
  64
  65 #endif /* __ASM_ASM_EXTABLE_H */