1b8b572e1SStephen Rothwell #ifndef _ASM_POWERPC_BUG_H 2b8b572e1SStephen Rothwell #define _ASM_POWERPC_BUG_H 3b8b572e1SStephen Rothwell #ifdef __KERNEL__ 4b8b572e1SStephen Rothwell 5b8b572e1SStephen Rothwell #include <asm/asm-compat.h> 6a58f053bSBenjamin Herrenschmidt 7b8b572e1SStephen Rothwell /* 8b8b572e1SStephen Rothwell * Define an illegal instr to trap on the bug. 9b8b572e1SStephen Rothwell * We don't use 0 because that marks the end of a function 10b8b572e1SStephen Rothwell * in the ELF ABI. That's "Boo Boo" in case you wonder... 11b8b572e1SStephen Rothwell */ 12b8b572e1SStephen Rothwell #define BUG_OPCODE .long 0x00b00b00 /* For asm */ 13b8b572e1SStephen Rothwell #define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */ 14b8b572e1SStephen Rothwell 15b8b572e1SStephen Rothwell #ifdef CONFIG_BUG 16b8b572e1SStephen Rothwell 17b8b572e1SStephen Rothwell #ifdef __ASSEMBLY__ 18a58f053bSBenjamin Herrenschmidt #include <asm/asm-offsets.h> 19b8b572e1SStephen Rothwell #ifdef CONFIG_DEBUG_BUGVERBOSE 20b8b572e1SStephen Rothwell .macro EMIT_BUG_ENTRY addr,file,line,flags 21b8b572e1SStephen Rothwell .section __bug_table,"a" 22b8b572e1SStephen Rothwell 5001: PPC_LONG \addr, 5002f 23b8b572e1SStephen Rothwell .short \line, \flags 24b8b572e1SStephen Rothwell .org 5001b+BUG_ENTRY_SIZE 25b8b572e1SStephen Rothwell .previous 26b8b572e1SStephen Rothwell .section .rodata,"a" 27b8b572e1SStephen Rothwell 5002: .asciz "\file" 28b8b572e1SStephen Rothwell .previous 29b8b572e1SStephen Rothwell .endm 30b8b572e1SStephen Rothwell #else 31b8b572e1SStephen Rothwell .macro EMIT_BUG_ENTRY addr,file,line,flags 32b8b572e1SStephen Rothwell .section __bug_table,"a" 33b8b572e1SStephen Rothwell 5001: PPC_LONG \addr 34b8b572e1SStephen Rothwell .short \flags 35b8b572e1SStephen Rothwell .org 5001b+BUG_ENTRY_SIZE 36b8b572e1SStephen Rothwell .previous 37b8b572e1SStephen Rothwell .endm 38b8b572e1SStephen Rothwell #endif /* verbose */ 39b8b572e1SStephen Rothwell 40b8b572e1SStephen Rothwell #else /* !__ASSEMBLY__ */ 41b8b572e1SStephen Rothwell /* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and 42b8b572e1SStephen Rothwell sizeof(struct bug_entry), respectively */ 43b8b572e1SStephen Rothwell #ifdef CONFIG_DEBUG_BUGVERBOSE 44b8b572e1SStephen Rothwell #define _EMIT_BUG_ENTRY \ 45b8b572e1SStephen Rothwell ".section __bug_table,\"a\"\n" \ 46b8b572e1SStephen Rothwell "2:\t" PPC_LONG "1b, %0\n" \ 47b8b572e1SStephen Rothwell "\t.short %1, %2\n" \ 48b8b572e1SStephen Rothwell ".org 2b+%3\n" \ 49b8b572e1SStephen Rothwell ".previous\n" 50b8b572e1SStephen Rothwell #else 51b8b572e1SStephen Rothwell #define _EMIT_BUG_ENTRY \ 52b8b572e1SStephen Rothwell ".section __bug_table,\"a\"\n" \ 53b8b572e1SStephen Rothwell "2:\t" PPC_LONG "1b\n" \ 54b8b572e1SStephen Rothwell "\t.short %2\n" \ 55b8b572e1SStephen Rothwell ".org 2b+%3\n" \ 56b8b572e1SStephen Rothwell ".previous\n" 57b8b572e1SStephen Rothwell #endif 58b8b572e1SStephen Rothwell 59b8b572e1SStephen Rothwell /* 60b8b572e1SStephen Rothwell * BUG_ON() and WARN_ON() do their best to cooperate with compile-time 61b8b572e1SStephen Rothwell * optimisations. However depending on the complexity of the condition 62b8b572e1SStephen Rothwell * some compiler versions may not produce optimal results. 63b8b572e1SStephen Rothwell */ 64b8b572e1SStephen Rothwell 65b8b572e1SStephen Rothwell #define BUG() do { \ 66b8b572e1SStephen Rothwell __asm__ __volatile__( \ 67b8b572e1SStephen Rothwell "1: twi 31,0,0\n" \ 68b8b572e1SStephen Rothwell _EMIT_BUG_ENTRY \ 69b8b572e1SStephen Rothwell : : "i" (__FILE__), "i" (__LINE__), \ 70b8b572e1SStephen Rothwell "i" (0), "i" (sizeof(struct bug_entry))); \ 7101ae45bcSDavid Daney unreachable(); \ 72b8b572e1SStephen Rothwell } while (0) 73b8b572e1SStephen Rothwell 74b8b572e1SStephen Rothwell #define BUG_ON(x) do { \ 75b8b572e1SStephen Rothwell if (__builtin_constant_p(x)) { \ 76b8b572e1SStephen Rothwell if (x) \ 77b8b572e1SStephen Rothwell BUG(); \ 78b8b572e1SStephen Rothwell } else { \ 79b8b572e1SStephen Rothwell __asm__ __volatile__( \ 80b8b572e1SStephen Rothwell "1: "PPC_TLNEI" %4,0\n" \ 81b8b572e1SStephen Rothwell _EMIT_BUG_ENTRY \ 82b8b572e1SStephen Rothwell : : "i" (__FILE__), "i" (__LINE__), "i" (0), \ 83b8b572e1SStephen Rothwell "i" (sizeof(struct bug_entry)), \ 84b8b572e1SStephen Rothwell "r" ((__force long)(x))); \ 85b8b572e1SStephen Rothwell } \ 86b8b572e1SStephen Rothwell } while (0) 87b8b572e1SStephen Rothwell 88b2be0527SBen Hutchings #define __WARN_TAINT(taint) do { \ 89b8b572e1SStephen Rothwell __asm__ __volatile__( \ 90b8b572e1SStephen Rothwell "1: twi 31,0,0\n" \ 91b8b572e1SStephen Rothwell _EMIT_BUG_ENTRY \ 92b8b572e1SStephen Rothwell : : "i" (__FILE__), "i" (__LINE__), \ 93b2be0527SBen Hutchings "i" (BUGFLAG_TAINT(taint)), \ 94b8b572e1SStephen Rothwell "i" (sizeof(struct bug_entry))); \ 95b8b572e1SStephen Rothwell } while (0) 96b8b572e1SStephen Rothwell 97b8b572e1SStephen Rothwell #define WARN_ON(x) ({ \ 98b8b572e1SStephen Rothwell int __ret_warn_on = !!(x); \ 99b8b572e1SStephen Rothwell if (__builtin_constant_p(__ret_warn_on)) { \ 100b8b572e1SStephen Rothwell if (__ret_warn_on) \ 101b8b572e1SStephen Rothwell __WARN(); \ 102b8b572e1SStephen Rothwell } else { \ 103b8b572e1SStephen Rothwell __asm__ __volatile__( \ 104b8b572e1SStephen Rothwell "1: "PPC_TLNEI" %4,0\n" \ 105b8b572e1SStephen Rothwell _EMIT_BUG_ENTRY \ 106b8b572e1SStephen Rothwell : : "i" (__FILE__), "i" (__LINE__), \ 107b2be0527SBen Hutchings "i" (BUGFLAG_TAINT(TAINT_WARN)), \ 108b8b572e1SStephen Rothwell "i" (sizeof(struct bug_entry)), \ 109b8b572e1SStephen Rothwell "r" (__ret_warn_on)); \ 110b8b572e1SStephen Rothwell } \ 111b8b572e1SStephen Rothwell unlikely(__ret_warn_on); \ 112b8b572e1SStephen Rothwell }) 113b8b572e1SStephen Rothwell 114b8b572e1SStephen Rothwell #define HAVE_ARCH_BUG 115b8b572e1SStephen Rothwell #define HAVE_ARCH_BUG_ON 116b8b572e1SStephen Rothwell #define HAVE_ARCH_WARN_ON 117b8b572e1SStephen Rothwell #endif /* __ASSEMBLY __ */ 118a58f053bSBenjamin Herrenschmidt #else 119a58f053bSBenjamin Herrenschmidt #ifdef __ASSEMBLY__ 120a58f053bSBenjamin Herrenschmidt .macro EMIT_BUG_ENTRY addr,file,line,flags 121a58f053bSBenjamin Herrenschmidt .endm 122a58f053bSBenjamin Herrenschmidt #else /* !__ASSEMBLY__ */ 123a58f053bSBenjamin Herrenschmidt #define _EMIT_BUG_ENTRY 124a58f053bSBenjamin Herrenschmidt #endif 125b8b572e1SStephen Rothwell #endif /* CONFIG_BUG */ 126b8b572e1SStephen Rothwell 127b8b572e1SStephen Rothwell #include <asm-generic/bug.h> 128b8b572e1SStephen Rothwell 129ae3a197eSDavid Howells #ifndef __ASSEMBLY__ 130ae3a197eSDavid Howells 131ae3a197eSDavid Howells struct pt_regs; 132ae3a197eSDavid Howells extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long); 133ae3a197eSDavid Howells extern void bad_page_fault(struct pt_regs *, unsigned long, int); 134ae3a197eSDavid Howells extern void _exception(int, struct pt_regs *, int, unsigned long); 135ae3a197eSDavid Howells extern void die(const char *, struct pt_regs *, long); 136ae3a197eSDavid Howells extern void print_backtrace(unsigned long *); 137ae3a197eSDavid Howells 138ae3a197eSDavid Howells #endif /* !__ASSEMBLY__ */ 139ae3a197eSDavid Howells 140b8b572e1SStephen Rothwell #endif /* __KERNEL__ */ 141b8b572e1SStephen Rothwell #endif /* _ASM_POWERPC_BUG_H */ 142