1 #ifndef _ASMARM_BUG_H 2 #define _ASMARM_BUG_H 3 4 5 #ifdef CONFIG_BUG 6 7 /* 8 * Use a suitable undefined instruction to use for ARM/Thumb2 bug handling. 9 * We need to be careful not to conflict with those used by other modules and 10 * the register_undef_hook() system. 11 */ 12 #ifdef CONFIG_THUMB2_KERNEL 13 #define BUG_INSTR_VALUE 0xde02 14 #define BUG_INSTR_TYPE ".hword " 15 #else 16 #define BUG_INSTR_VALUE 0xe7f001f2 17 #define BUG_INSTR_TYPE ".word " 18 #endif 19 20 21 #define BUG() _BUG(__FILE__, __LINE__, BUG_INSTR_VALUE) 22 #define _BUG(file, line, value) __BUG(file, line, value) 23 24 #ifdef CONFIG_DEBUG_BUGVERBOSE 25 26 /* 27 * The extra indirection is to ensure that the __FILE__ string comes through 28 * OK. Many version of gcc do not support the asm %c parameter which would be 29 * preferable to this unpleasantness. We use mergeable string sections to 30 * avoid multiple copies of the string appearing in the kernel image. 31 */ 32 33 #define __BUG(__file, __line, __value) \ 34 do { \ 35 asm volatile("1:\t" BUG_INSTR_TYPE #__value "\n" \ 36 ".pushsection .rodata.str, \"aMS\", %progbits, 1\n" \ 37 "2:\t.asciz " #__file "\n" \ 38 ".popsection\n" \ 39 ".pushsection __bug_table,\"a\"\n" \ 40 "3:\t.word 1b, 2b\n" \ 41 "\t.hword " #__line ", 0\n" \ 42 ".popsection"); \ 43 unreachable(); \ 44 } while (0) 45 46 #else /* not CONFIG_DEBUG_BUGVERBOSE */ 47 48 #define __BUG(__file, __line, __value) \ 49 do { \ 50 asm volatile(BUG_INSTR_TYPE #__value); \ 51 unreachable(); \ 52 } while (0) 53 #endif /* CONFIG_DEBUG_BUGVERBOSE */ 54 55 #define HAVE_ARCH_BUG 56 #endif /* CONFIG_BUG */ 57 58 #include <asm-generic/bug.h> 59 60 #endif 61