LXR linux/arch/powerpc/include/asm/bug.h

   1#ifndef _ASM_POWERPC_BUG_H
   2#define _ASM_POWERPC_BUG_H
   3#ifdef __KERNEL__
   4
   5#include <asm/asm-compat.h>
   6
   7/*
   8 * Define an illegal instr to trap on the bug.
   9 * We don't use 0 because that marks the end of a function
  10 * in the ELF ABI.  That's "Boo Boo" in case you wonder...
  11 */
  12#define BUG_OPCODE .long 0x00b00b00  /* For asm */
  13#define BUG_ILLEGAL_INSTR "0x00b00b00" /* For BUG macro */
  14
  15#ifdef CONFIG_BUG
  16
  17#ifdef __ASSEMBLY__
  18#include <asm/asm-offsets.h>
  19#ifdef CONFIG_DEBUG_BUGVERBOSE
  20.macro EMIT_BUG_ENTRY addr,file,line,flags
  21         .section __bug_table,"a"
  225001:    PPC_LONG \addr, 5002f
  23         .short \line, \flags
  24         .org 5001b+BUG_ENTRY_SIZE
  25         .previous
  26         .section .rodata,"a"
  275002:    .asciz "\file"
  28         .previous
  29.endm
  30#else
  31.macro EMIT_BUG_ENTRY addr,file,line,flags
  32         .section __bug_table,"a"
  335001:    PPC_LONG \addr
  34         .short \flags
  35         .org 5001b+BUG_ENTRY_SIZE
  36         .previous
  37.endm
  38#endif /* verbose */
  39
  40#else /* !__ASSEMBLY__ */
  41/* _EMIT_BUG_ENTRY expects args %0,%1,%2,%3 to be FILE, LINE, flags and
  42   sizeof(struct bug_entry), respectively */
  43#ifdef CONFIG_DEBUG_BUGVERBOSE
  44#define _EMIT_BUG_ENTRY                         \
  45        ".section __bug_table,\"a\"\n"          \
  46        "2:\t" PPC_LONG "1b, %0\n"              \
  47        "\t.short %1, %2\n"                     \
  48        ".org 2b+%3\n"                          \
  49        ".previous\n"
  50#else
  51#define _EMIT_BUG_ENTRY                         \
  52        ".section __bug_table,\"a\"\n"          \
  53        "2:\t" PPC_LONG "1b\n"                  \
  54        "\t.short %2\n"                         \
  55        ".org 2b+%3\n"                          \
  56        ".previous\n"
  57#endif
  58
  59/*
  60 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  61 * optimisations. However depending on the complexity of the condition
  62 * some compiler versions may not produce optimal results.
  63 */
  64
  65#define BUG() do {                                              \
  66        __asm__ __volatile__(                                   \
  67                "1:     twi 31,0,0\n"                           \
  68                _EMIT_BUG_ENTRY                                 \
  69                : : "i" (__FILE__), "i" (__LINE__),             \
  70                    "i" (0), "i"  (sizeof(struct bug_entry)));  \
  71        unreachable();                                          \
  72} while (0)
  73
  74#define BUG_ON(x) do {                                          \
  75        if (__builtin_constant_p(x)) {                          \
  76                if (x)                                          \
  77                        BUG();                                  \
  78        } else {                                                \
  79                __asm__ __volatile__(                           \
  80                "1:     "PPC_TLNEI"     %4,0\n"                 \
  81                _EMIT_BUG_ENTRY                                 \
  82                : : "i" (__FILE__), "i" (__LINE__), "i" (0),    \
  83                  "i" (sizeof(struct bug_entry)),               \
  84                  "r" ((__force long)(x)));                     \
  85        }                                                       \
  86} while (0)
  87
  88#define __WARN_TAINT(taint) do {                                \
  89        __asm__ __volatile__(                                   \
  90                "1:     twi 31,0,0\n"                           \
  91                _EMIT_BUG_ENTRY                                 \
  92                : : "i" (__FILE__), "i" (__LINE__),             \
  93                  "i" (BUGFLAG_TAINT(taint)),                   \
  94                  "i" (sizeof(struct bug_entry)));              \
  95} while (0)
  96
  97#define WARN_ON(x) ({                                           \
  98        int __ret_warn_on = !!(x);                              \
  99        if (__builtin_constant_p(__ret_warn_on)) {              \
 100                if (__ret_warn_on)                              \
 101                        __WARN();                               \
 102        } else {                                                \
 103                __asm__ __volatile__(                           \
 104                "1:     "PPC_TLNEI"     %4,0\n"                 \
 105                _EMIT_BUG_ENTRY                                 \
 106                : : "i" (__FILE__), "i" (__LINE__),             \
 107                  "i" (BUGFLAG_TAINT(TAINT_WARN)),              \
 108                  "i" (sizeof(struct bug_entry)),               \
 109                  "r" (__ret_warn_on));                         \
 110        }                                                       \
 111        unlikely(__ret_warn_on);                                \
 112})
 113
 114#define HAVE_ARCH_BUG
 115#define HAVE_ARCH_BUG_ON
 116#define HAVE_ARCH_WARN_ON
 117#endif /* __ASSEMBLY __ */
 118#else
 119#ifdef __ASSEMBLY__
 120.macro EMIT_BUG_ENTRY addr,file,line,flags
 121.endm
 122#else /* !__ASSEMBLY__ */
 123#define _EMIT_BUG_ENTRY
 124#endif
 125#endif /* CONFIG_BUG */
 126
 127#include <asm-generic/bug.h>
 128
 129#ifndef __ASSEMBLY__
 130
 131struct pt_regs;
 132extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
 133extern void bad_page_fault(struct pt_regs *, unsigned long, int);
 134extern void _exception(int, struct pt_regs *, int, unsigned long);
 135extern void die(const char *, struct pt_regs *, long);
 136
 137#endif /* !__ASSEMBLY__ */
 138
 139#endif /* __KERNEL__ */
 140#endif /* _ASM_POWERPC_BUG_H */
 141