1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_BUG_H 3 #define _ASM_POWERPC_BUG_H 4 #ifdef __KERNEL__ 5 6 #include <asm/asm-compat.h> 7 8 #ifdef CONFIG_BUG 9 10 #ifdef __ASSEMBLY__ 11 #include <asm/asm-offsets.h> 12 #ifdef CONFIG_DEBUG_BUGVERBOSE 13 .macro EMIT_BUG_ENTRY addr,file,line,flags 14 .section __bug_table,"aw" 15 5001: PPC_LONG \addr, 5002f 16 .short \line, \flags 17 .org 5001b+BUG_ENTRY_SIZE 18 .previous 19 .section .rodata,"a" 20 5002: .asciz "\file" 21 .previous 22 .endm 23 #else 24 .macro EMIT_BUG_ENTRY addr,file,line,flags 25 .section __bug_table,"aw" 26 5001: PPC_LONG \addr 27 .short \flags 28 .org 5001b+BUG_ENTRY_SIZE 29 .previous 30 .endm 31 #endif /* verbose */ 32 33 #else /* !__ASSEMBLY__ */ 34 /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and 35 sizeof(struct bug_entry), respectively */ 36 #ifdef CONFIG_DEBUG_BUGVERBOSE 37 #define _EMIT_BUG_ENTRY \ 38 ".section __bug_table,\"aw\"\n" \ 39 "2:\t" PPC_LONG "1b, %0\n" \ 40 "\t.short %1, %2\n" \ 41 ".org 2b+%3\n" \ 42 ".previous\n" 43 #else 44 #define _EMIT_BUG_ENTRY \ 45 ".section __bug_table,\"aw\"\n" \ 46 "2:\t" PPC_LONG "1b\n" \ 47 "\t.short %2\n" \ 48 ".org 2b+%3\n" \ 49 ".previous\n" 50 #endif 51 52 /* 53 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time 54 * optimisations. However depending on the complexity of the condition 55 * some compiler versions may not produce optimal results. 56 */ 57 58 #define BUG() do { \ 59 __asm__ __volatile__( \ 60 "1: twi 31,0,0\n" \ 61 _EMIT_BUG_ENTRY \ 62 : : "i" (__FILE__), "i" (__LINE__), \ 63 "i" (0), "i" (sizeof(struct bug_entry))); \ 64 unreachable(); \ 65 } while (0) 66 67 #define BUG_ON(x) do { \ 68 if (__builtin_constant_p(x)) { \ 69 if (x) \ 70 BUG(); \ 71 } else { \ 72 __asm__ __volatile__( \ 73 "1: "PPC_TLNEI" %4,0\n" \ 74 _EMIT_BUG_ENTRY \ 75 : : "i" (__FILE__), "i" (__LINE__), "i" (0), \ 76 "i" (sizeof(struct bug_entry)), \ 77 "r" ((__force long)(x))); \ 78 } \ 79 } while (0) 80 81 #define __WARN_FLAGS(flags) do { \ 82 __asm__ __volatile__( \ 83 "1: twi 31,0,0\n" \ 84 _EMIT_BUG_ENTRY \ 85 : : "i" (__FILE__), "i" (__LINE__), \ 86 "i" (BUGFLAG_WARNING|(flags)), \ 87 "i" (sizeof(struct bug_entry))); \ 88 } while (0) 89 90 #define WARN_ON(x) ({ \ 91 int __ret_warn_on = !!(x); \ 92 if (__builtin_constant_p(__ret_warn_on)) { \ 93 if (__ret_warn_on) \ 94 __WARN(); \ 95 } else { \ 96 __asm__ __volatile__( \ 97 "1: "PPC_TLNEI" %4,0\n" \ 98 _EMIT_BUG_ENTRY \ 99 : : "i" (__FILE__), "i" (__LINE__), \ 100 "i" (BUGFLAG_WARNING|BUGFLAG_TAINT(TAINT_WARN)),\ 101 "i" (sizeof(struct bug_entry)), \ 102 "r" (__ret_warn_on)); \ 103 } \ 104 unlikely(__ret_warn_on); \ 105 }) 106 107 #define HAVE_ARCH_BUG 108 #define HAVE_ARCH_BUG_ON 109 #define HAVE_ARCH_WARN_ON 110 #endif /* __ASSEMBLY __ */ 111 #else 112 #ifdef __ASSEMBLY__ 113 .macro EMIT_BUG_ENTRY addr,file,line,flags 114 .endm 115 #else /* !__ASSEMBLY__ */ 116 #define _EMIT_BUG_ENTRY 117 #endif 118 #endif /* CONFIG_BUG */ 119 120 #include <asm-generic/bug.h> 121 122 #ifndef __ASSEMBLY__ 123 124 struct pt_regs; 125 extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long); 126 extern void bad_page_fault(struct pt_regs *, unsigned long, int); 127 extern void _exception(int, struct pt_regs *, int, unsigned long); 128 extern void _exception_pkey(struct pt_regs *, unsigned long, int); 129 extern void die(const char *, struct pt_regs *, long); 130 extern bool die_will_crash(void); 131 extern void panic_flush_kmsg_start(void); 132 extern void panic_flush_kmsg_end(void); 133 #endif /* !__ASSEMBLY__ */ 134 135 #endif /* __KERNEL__ */ 136 #endif /* _ASM_POWERPC_BUG_H */ 137