1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6 #ifndef _ASM_RISCV_BUG_H 7 #define _ASM_RISCV_BUG_H 8 9 #include <linux/compiler.h> 10 #include <linux/const.h> 11 #include <linux/types.h> 12 13 #include <asm/asm.h> 14 15 #define __INSN_LENGTH_MASK _UL(0x3) 16 #define __INSN_LENGTH_32 _UL(0x3) 17 #define __COMPRESSED_INSN_MASK _UL(0xffff) 18 19 #define __BUG_INSN_32 _UL(0x00100073) /* ebreak */ 20 #define __BUG_INSN_16 _UL(0x9002) /* c.ebreak */ 21 22 #define GET_INSN_LENGTH(insn) \ 23 ({ \ 24 unsigned long __len; \ 25 __len = ((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ? \ 26 4UL : 2UL; \ 27 __len; \ 28 }) 29 30 typedef u32 bug_insn_t; 31 32 #define __BUG_ENTRY_ADDR RISCV_INT " 1b - ." 33 #define __BUG_ENTRY_FILE(file) RISCV_INT " " file " - ." 34 35 #ifdef CONFIG_DEBUG_BUGVERBOSE 36 #define __BUG_ENTRY(file, line, flags) \ 37 __BUG_ENTRY_ADDR "\n\t" \ 38 __BUG_ENTRY_FILE(file) "\n\t" \ 39 RISCV_SHORT " " line "\n\t" \ 40 RISCV_SHORT " " flags 41 #else 42 #define __BUG_ENTRY(file, line, flags) \ 43 __BUG_ENTRY_ADDR "\n\t" \ 44 RISCV_SHORT " " flags 45 #endif 46 47 #ifdef CONFIG_GENERIC_BUG 48 49 #define ARCH_WARN_ASM(file, line, flags, size) \ 50 "1:\n\t" \ 51 "ebreak\n" \ 52 ".pushsection __bug_table,\"aw\"\n\t" \ 53 "2:\n\t" \ 54 __BUG_ENTRY(file, line, flags) "\n\t" \ 55 ".org 2b + " size "\n\t" \ 56 ".popsection" \ 57 58 #define __BUG_FLAGS(cond_str, flags) \ 59 do { \ 60 __asm__ __volatile__ ( \ 61 ARCH_WARN_ASM("%0", "%1", "%2", "%3") \ 62 : \ 63 : "i" (WARN_CONDITION_STR(cond_str) __FILE__), "i" (__LINE__), \ 64 "i" (flags), \ 65 "i" (sizeof(struct bug_entry))); \ 66 } while (0) 67 68 #else /* CONFIG_GENERIC_BUG */ 69 #define __BUG_FLAGS(cond_str, flags) do { \ 70 __asm__ __volatile__ ("ebreak\n"); \ 71 } while (0) 72 #endif /* CONFIG_GENERIC_BUG */ 73 74 #define BUG() do { \ 75 __BUG_FLAGS("", 0); \ 76 unreachable(); \ 77 } while (0) 78 79 #define __WARN_FLAGS(cond_str, flags) __BUG_FLAGS(cond_str, BUGFLAG_WARNING|(flags)) 80 81 #define ARCH_WARN_REACHABLE 82 83 #define HAVE_ARCH_BUG 84 85 #include <asm-generic/bug.h> 86 87 struct pt_regs; 88 struct task_struct; 89 90 void __show_regs(struct pt_regs *regs); 91 void die(struct pt_regs *regs, const char *str); 92 void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr); 93 94 #endif /* _ASM_RISCV_BUG_H */ 95