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

   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"
  155001:    PPC_LONG \addr, 5002f
  16         .short \line, \flags
  17         .org 5001b+BUG_ENTRY_SIZE
  18         .previous
  19         .section .rodata,"a"
  205002:    .asciz "\file"
  21         .previous
  22.endm
  23#else
  24.macro EMIT_BUG_ENTRY addr,file,line,flags
  25         .section __bug_table,"aw"
  265001:    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#define BUG_ENTRY(insn, flags, ...)                     \
  53        __asm__ __volatile__(                           \
  54                "1:     " insn "\n"                     \
  55                _EMIT_BUG_ENTRY                         \
  56                : : "i" (__FILE__), "i" (__LINE__),     \
  57                  "i" (flags),                          \
  58                  "i" (sizeof(struct bug_entry)),       \
  59                  ##__VA_ARGS__)
  60
  61/*
  62 * BUG_ON() and WARN_ON() do their best to cooperate with compile-time
  63 * optimisations. However depending on the complexity of the condition
  64 * some compiler versions may not produce optimal results.
  65 */
  66
  67#define BUG() do {                                              \
  68        BUG_ENTRY("twi 31, 0, 0", 0);                           \
  69        unreachable();                                          \
  70} while (0)
  71
  72#define BUG_ON(x) do {                                          \
  73        if (__builtin_constant_p(x)) {                          \
  74                if (x)                                          \
  75                        BUG();                                  \
  76        } else {                                                \
  77                BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x)));      \
  78        }                                                       \
  79} while (0)
  80
  81#define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (flags))
  82
  83#define WARN_ON(x) ({                                           \
  84        int __ret_warn_on = !!(x);                              \
  85        if (__builtin_constant_p(__ret_warn_on)) {              \
  86                if (__ret_warn_on)                              \
  87                        __WARN();                               \
  88        } else {                                                \
  89                BUG_ENTRY(PPC_TLNEI " %4, 0",                   \
  90                          BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN),  \
  91                          "r" (__ret_warn_on)); \
  92        }                                                       \
  93        unlikely(__ret_warn_on);                                \
  94})
  95
  96#define HAVE_ARCH_BUG
  97#define HAVE_ARCH_BUG_ON
  98#define HAVE_ARCH_WARN_ON
  99#endif /* __ASSEMBLY __ */
 100#else
 101#ifdef __ASSEMBLY__
 102.macro EMIT_BUG_ENTRY addr,file,line,flags
 103.endm
 104#else /* !__ASSEMBLY__ */
 105#define _EMIT_BUG_ENTRY
 106#endif
 107#endif /* CONFIG_BUG */
 108
 109#include <asm-generic/bug.h>
 110
 111#ifndef __ASSEMBLY__
 112
 113struct pt_regs;
 114extern int do_page_fault(struct pt_regs *, unsigned long, unsigned long);
 115extern void bad_page_fault(struct pt_regs *, unsigned long, int);
 116extern void _exception(int, struct pt_regs *, int, unsigned long);
 117extern void _exception_pkey(struct pt_regs *, unsigned long, int);
 118extern void die(const char *, struct pt_regs *, long);
 119extern bool die_will_crash(void);
 120extern void panic_flush_kmsg_start(void);
 121extern void panic_flush_kmsg_end(void);
 122#endif /* !__ASSEMBLY__ */
 123
 124#endif /* __KERNEL__ */
 125#endif /* _ASM_POWERPC_BUG_H */
 126