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_FAULT 3 13 #define EX_TYPE_UA_LOAD_REG 5 14 #define EX_TYPE_UA_LOAD_REGPAIR 6 15 #define EX_TYPE_ZEROPAD 7 16 #define EX_TYPE_FPC 8 17 #define EX_TYPE_UA_MVCOS_TO 9 18 #define EX_TYPE_UA_MVCOS_FROM 10 19 20 #define EX_DATA_REG_ERR_SHIFT 0 21 #define EX_DATA_REG_ERR GENMASK(3, 0) 22 23 #define EX_DATA_REG_ADDR_SHIFT 4 24 #define EX_DATA_REG_ADDR GENMASK(7, 4) 25 26 #define EX_DATA_LEN_SHIFT 8 27 #define EX_DATA_LEN GENMASK(11, 8) 28 29 #define __EX_TABLE(_section, _fault, _target, _type, _regerr, _regaddr, _len) \ 30 stringify_in_c(.section _section,"a";) \ 31 stringify_in_c(.balign 4;) \ 32 stringify_in_c(.long (_fault) - .;) \ 33 stringify_in_c(.long (_target) - .;) \ 34 stringify_in_c(.short (_type);) \ 35 stringify_in_c(.macro extable_reg regerr, regaddr;) \ 36 stringify_in_c(.set .Lfound, 0;) \ 37 stringify_in_c(.set .Lcurr, 0;) \ 38 stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \ 39 stringify_in_c( .ifc "\regerr", "%%r\rs";) \ 40 stringify_in_c( .set .Lfound, 1;) \ 41 stringify_in_c( .set .Lregerr, .Lcurr;) \ 42 stringify_in_c( .endif;) \ 43 stringify_in_c( .set .Lcurr, .Lcurr+1;) \ 44 stringify_in_c(.endr;) \ 45 stringify_in_c(.ifne (.Lfound != 1);) \ 46 stringify_in_c( .error "extable_reg: bad register argument1";) \ 47 stringify_in_c(.endif;) \ 48 stringify_in_c(.set .Lfound, 0;) \ 49 stringify_in_c(.set .Lcurr, 0;) \ 50 stringify_in_c(.irp rs,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15;) \ 51 stringify_in_c( .ifc "\regaddr", "%%r\rs";) \ 52 stringify_in_c( .set .Lfound, 1;) \ 53 stringify_in_c( .set .Lregaddr, .Lcurr;) \ 54 stringify_in_c( .endif;) \ 55 stringify_in_c( .set .Lcurr, .Lcurr+1;) \ 56 stringify_in_c(.endr;) \ 57 stringify_in_c(.ifne (.Lfound != 1);) \ 58 stringify_in_c( .error "extable_reg: bad register argument2";) \ 59 stringify_in_c(.endif;) \ 60 stringify_in_c(.short .Lregerr << EX_DATA_REG_ERR_SHIFT | \ 61 .Lregaddr << EX_DATA_REG_ADDR_SHIFT | \ 62 _len << EX_DATA_LEN_SHIFT;) \ 63 stringify_in_c(.endm;) \ 64 stringify_in_c(extable_reg _regerr,_regaddr;) \ 65 stringify_in_c(.purgem extable_reg;) \ 66 stringify_in_c(.previous) 67 68 /* 69 * EX_TABLE_INSN usage rules: 70 * 71 * _fault must point to the faulting instruction, never behind it. 72 * 73 * This differs from the former EX_TABLE convention, where usually two entries 74 * were needed. One that pointed to the faulting instruction (for nullifying 75 * exceptions), and a second one that pointed behind the instruction (for 76 * suppressing, completing, and terminating exceptions). 77 */ 78 #define EX_TABLE_INSN(_fault, _target) \ 79 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FIXUP, __stringify(%%r0), __stringify(%%r0), 0) 80 81 #define EX_TABLE_INSN_AMODE31(_fault, _target) \ 82 __EX_TABLE(.amode31.ex_table, _fault, _target, EX_TYPE_FIXUP, __stringify(%%r0), __stringify(%%r0), 0) 83 84 #define EX_TABLE_INSN_UA_FAULT(_fault, _target, _regerr) \ 85 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_FAULT, _regerr, _regerr, 0) 86 87 #define EX_TABLE_INSN_UA_LOAD_REG(_fault, _target, _regerr, _regzero) \ 88 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REG, _regerr, _regzero, 0) 89 90 #define EX_TABLE_INSN_UA_LOAD_REGPAIR(_fault, _target, _regerr, _regzero) \ 91 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_LOAD_REGPAIR, _regerr, _regzero, 0) 92 93 #define EX_TABLE_INSN_ZEROPAD(_fault, _target, _regdata, _regaddr) \ 94 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_ZEROPAD, _regdata, _regaddr, 0) 95 96 #define EX_TABLE_INSN_FPC(_fault, _target) \ 97 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_FPC, __stringify(%%r0), __stringify(%%r0), 0) 98 99 #define EX_TABLE_INSN_UA_MVCOS_TO(_fault, _target) \ 100 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_MVCOS_TO, __stringify(%%r0), __stringify(%%r0), 0) 101 102 #define EX_TABLE_INSN_UA_MVCOS_FROM(_fault, _target) \ 103 __EX_TABLE(__ex_table, _fault, _target, EX_TYPE_UA_MVCOS_FROM, __stringify(%%r0), __stringify(%%r0), 0) 104 105 #endif /* __ASM_EXTABLE_H */ 106