arch/s390/include/asm/asm-extable.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_EXTABLE_H
   3 #define __ASM_EXTABLE_H
   4
   5 #include <linux/stringify.h>
   6 #include <linux/bits.h>
   7 #include <asm/asm-const.h>
   8
   9 #define EX_TYPE_NONE            0
  10 #define EX_TYPE_FIXUP           1
  11 #define EX_TYPE_BPF             2
  12 #define EX_TYPE_UA_STORE        3
  13 #define EX_TYPE_UA_LOAD_MEM     4
  14 #define EX_TYPE_UA_LOAD_REG     5
  15
  16 #define EX_DATA_REG_ERR_SHIFT   0
  17 #define EX_DATA_REG_ERR         GENMASK(3, 0)
  18
  19 #define EX_DATA_REG_ADDR_SHIFT  4
  20 #define EX_DATA_REG_ADDR        GENMASK(7, 4)
  21
  22 #define EX_DATA_LEN_SHIFT       8
  23 #define EX_DATA_LEN             GENMASK(11, 8)
  24
  25 #define __EX_TABLE(_section, _fault, _target, _type)                    \
  26         stringify_in_c(.section _section,"a";)                          \
  27         stringify_in_c(.align   4;)                                     \
  28         stringify_in_c(.long    (_fault) - .;)                          \
  29         stringify_in_c(.long    (_target) - .;)                         \
  30         stringify_in_c(.short   (_type);)                               \
  31         stringify_in_c(.short   0;)                                     \
  32         stringify_in_c(.previous)
  33
  34 #define __EX_TABLE_UA(_section, _fault, _target, _type, _regerr, _regaddr, _len)\
  35         stringify_in_c(.section _section,"a";)                                  \
  36         stringify_in_c(.align   4;)                                             \
  37         stringify_in_c(.long    (_fault) - .;)                                  \
  38         stringify_in_c(.long    (_target) - .;)                                 \
  39         stringify_in_c(.short   (_type);)                                       \
  40         stringify_in_c(.macro   extable_reg regerr, regaddr;)                   \
  41         stringify_in_c(.set     .Lfound, 0;)                                    \
  42         stringify_in_c(.set     .Lcurr, 0;)                                     \
  43         stringify_in_c(.irp     rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;)      \
  44         stringify_in_c(         .ifc    "\regerr", "%%r\rs";)                   \
  45         stringify_in_c(                 .set    .Lfound, 1;)                    \
  46         stringify_in_c(                 .set    .Lregerr, .Lcurr;)              \
  47         stringify_in_c(         .endif;)                                        \
  48         stringify_in_c(         .set    .Lcurr, .Lcurr+1;)                      \
  49         stringify_in_c(.endr;)                                                  \
  50         stringify_in_c(.ifne    (.Lfound != 1);)                                \
  51         stringify_in_c(         .error  "extable_reg: bad register argument1";) \
  52         stringify_in_c(.endif;)                                                 \
  53         stringify_in_c(.set     .Lfound, 0;)                                    \
  54         stringify_in_c(.set     .Lcurr, 0;)                                     \
  55         stringify_in_c(.irp     rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;)      \
  56         stringify_in_c(         .ifc    "\regaddr", "%%r\rs";)                  \
  57         stringify_in_c(                 .set    .Lfound, 1;)                    \
  58         stringify_in_c(                 .set    .Lregaddr, .Lcurr;)             \
  59         stringify_in_c(         .endif;)                                        \
  60         stringify_in_c(         .set    .Lcurr, .Lcurr+1;)                      \
  61         stringify_in_c(.endr;)                                                  \
  62         stringify_in_c(.ifne    (.Lfound != 1);)                                \
  63         stringify_in_c(         .error  "extable_reg: bad register argument2";) \
  64         stringify_in_c(.endif;)                                                 \
  65         stringify_in_c(.short   .Lregerr << EX_DATA_REG_ERR_SHIFT |             \
  66                                 .Lregaddr << EX_DATA_REG_ADDR_SHIFT |           \
  67                                 _len << EX_DATA_LEN_SHIFT;)                     \
  68         stringify_in_c(.endm;)                                                  \
  69         stringify_in_c(extable_reg _regerr,_regaddr;)                           \
  70         stringify_in_c(.purgem  extable_reg;)                                   \
  71         stringify_in_c(.previous)
  72
  73 #define EX_TABLE(_fault, _target)                                       \
  74         __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FIXUP)
  75
  76 #define EX_TABLE_AMODE31(_fault, _target)                               \
  77         __EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP)
  78
  79 #define EX_TABLE_UA_STORE(_fault, _target, _regerr)                     \
  80         __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_STORE, _regerr, _regerr, 0)
  81
  82 #define EX_TABLE_UA_LOAD_MEM(_fault, _target, _regerr, _regmem, _len)   \
  83         __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_MEM, _regerr, _regmem, _len)
  84
  85 #define EX_TABLE_UA_LOAD_REG(_fault, _target, _regerr, _regzero)        \
  86         __EX_TABLE_UA(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0)
  87
  88 #endif /* __ASM_EXTABLE_H */