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Diffstat (limited to 'include/asm-generic/bug.h')
| -rw-r--r-- | include/asm-generic/bug.h | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h new file mode 100644 index 000000000..76a10e0dc --- /dev/null +++ b/include/asm-generic/bug.h @@ -0,0 +1,246 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_GENERIC_BUG_H +#define _ASM_GENERIC_BUG_H + +#include <linux/compiler.h> +#include <linux/instrumentation.h> + +#define CUT_HERE "------------[ cut here ]------------\n" + +#ifdef CONFIG_GENERIC_BUG +#define BUGFLAG_WARNING (1 << 0) +#define BUGFLAG_ONCE (1 << 1) +#define BUGFLAG_DONE (1 << 2) +#define BUGFLAG_NO_CUT_HERE (1 << 3) /* CUT_HERE already sent */ +#define BUGFLAG_TAINT(taint) ((taint) << 8) +#define BUG_GET_TAINT(bug) ((bug)->flags >> 8) +#endif + +#ifndef __ASSEMBLY__ +#include <linux/kernel.h> + +#ifdef CONFIG_BUG + +#ifdef CONFIG_GENERIC_BUG +struct bug_entry { +#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS + unsigned long bug_addr; +#else + signed int bug_addr_disp; +#endif +#ifdef CONFIG_DEBUG_BUGVERBOSE +#ifndef CONFIG_GENERIC_BUG_RELATIVE_POINTERS + const char *file; +#else + signed int file_disp; +#endif + unsigned short line; +#endif + unsigned short flags; +}; +#endif /* CONFIG_GENERIC_BUG */ + +/* + * Don't use BUG() or BUG_ON() unless there's really no way out; one + * example might be detecting data structure corruption in the middle + * of an operation that can't be backed out of. If the (sub)system + * can somehow continue operating, perhaps with reduced functionality, + * it's probably not BUG-worthy. + * + * If you're tempted to BUG(), think again: is completely giving up + * really the *only* solution? There are usually better options, where + * users don't need to reboot ASAP and can mostly shut down cleanly. + */ +#ifndef HAVE_ARCH_BUG +#define BUG() do { \ + printk("BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __func__); \ + barrier_before_unreachable(); \ + panic("BUG!"); \ +} while (0) +#endif + +#ifndef HAVE_ARCH_BUG_ON +#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) +#endif + +/* + * WARN(), WARN_ON(), WARN_ON_ONCE, and so on can be used to report + * significant kernel issues that need prompt attention if they should ever + * appear at runtime. + * + * Do not use these macros when checking for invalid external inputs + * (e.g. invalid system call arguments, or invalid data coming from + * network/devices), and on transient conditions like ENOMEM or EAGAIN. + * These macros should be used for recoverable kernel issues only. + * For invalid external inputs, transient conditions, etc use + * pr_err[_once/_ratelimited]() followed by dump_stack(), if necessary. + * Do not include "BUG"/"WARNING" in format strings manually to make these + * conditions distinguishable from kernel issues. + * + * Use the versions with printk format strings to provide better diagnostics. + */ +#ifndef __WARN_FLAGS +extern __printf(4, 5) +void warn_slowpath_fmt(const char *file, const int line, unsigned taint, + const char *fmt, ...); +#define __WARN() __WARN_printf(TAINT_WARN, NULL) +#define __WARN_printf(taint, arg...) do { \ + instrumentation_begin(); \ + warn_slowpath_fmt(__FILE__, __LINE__, taint, arg); \ + instrumentation_end(); \ + } while (0) +#else +extern __printf(1, 2) void __warn_printk(const char *fmt, ...); +#define __WARN() __WARN_FLAGS(BUGFLAG_TAINT(TAINT_WARN)) +#define __WARN_printf(taint, arg...) do { \ + instrumentation_begin(); \ + __warn_printk(arg); \ + __WARN_FLAGS(BUGFLAG_NO_CUT_HERE | BUGFLAG_TAINT(taint));\ + instrumentation_end(); \ + } while (0) +#define WARN_ON_ONCE(condition) ({ \ + int __ret_warn_on = !!(condition); \ + if (unlikely(__ret_warn_on)) \ + __WARN_FLAGS(BUGFLAG_ONCE | \ + BUGFLAG_TAINT(TAINT_WARN)); \ + unlikely(__ret_warn_on); \ +}) +#endif + +/* used internally by panic.c */ +struct warn_args; +struct pt_regs; + +void __warn(const char *file, int line, void *caller, unsigned taint, + struct pt_regs *regs, struct warn_args *args); + +#ifndef WARN_ON +#define WARN_ON(condition) ({ \ + int __ret_warn_on = !!(condition); \ + if (unlikely(__ret_warn_on)) \ + __WARN(); \ + unlikely(__ret_warn_on); \ +}) +#endif + +#ifndef WARN +#define WARN(condition, format...) ({ \ + int __ret_warn_on = !!(condition); \ + if (unlikely(__ret_warn_on)) \ + __WARN_printf(TAINT_WARN, format); \ + unlikely(__ret_warn_on); \ +}) +#endif + +#define WARN_TAINT(condition, taint, format...) ({ \ + int __ret_warn_on = !!(condition); \ + if (unlikely(__ret_warn_on)) \ + __WARN_printf(taint, format); \ + unlikely(__ret_warn_on); \ +}) + +#ifndef WARN_ON_ONCE +#define WARN_ON_ONCE(condition) ({ \ + static bool __section(".data.once") __warned; \ + int __ret_warn_once = !!(condition); \ + \ + if (unlikely(__ret_warn_once && !__warned)) { \ + __warned = true; \ + WARN_ON(1); \ + } \ + unlikely(__ret_warn_once); \ +}) +#endif + +#define WARN_ONCE(condition, format...) ({ \ + static bool __section(".data.once") __warned; \ + int __ret_warn_once = !!(condition); \ + \ + if (unlikely(__ret_warn_once && !__warned)) { \ + __warned = true; \ + WARN(1, format); \ + } \ + unlikely(__ret_warn_once); \ +}) + +#define WARN_TAINT_ONCE(condition, taint, format...) ({ \ + static bool __section(".data.once") __warned; \ + int __ret_warn_once = !!(condition); \ + \ + if (unlikely(__ret_warn_once && !__warned)) { \ + __warned = true; \ + WARN_TAINT(1, taint, format); \ + } \ + unlikely(__ret_warn_once); \ +}) + +#else /* !CONFIG_BUG */ +#ifndef HAVE_ARCH_BUG +#define BUG() do {} while (1) +#endif + +#ifndef HAVE_ARCH_BUG_ON +#define BUG_ON(condition) do { if (unlikely(condition)) BUG(); } while (0) +#endif + +#ifndef HAVE_ARCH_WARN_ON +#define WARN_ON(condition) ({ \ + int __ret_warn_on = !!(condition); \ + unlikely(__ret_warn_on); \ +}) +#endif + +#ifndef WARN +#define WARN(condition, format...) ({ \ + int __ret_warn_on = !!(condition); \ + no_printk(format); \ + unlikely(__ret_warn_on); \ +}) +#endif + +#define WARN_ON_ONCE(condition) WARN_ON(condition) +#define WARN_ONCE(condition, format...) WARN(condition, format) +#define WARN_TAINT(condition, taint, format...) WARN(condition, format) +#define WARN_TAINT_ONCE(condition, taint, format...) WARN(condition, format) + +#endif + +/* + * WARN_ON_SMP() is for cases that the warning is either + * meaningless for !SMP or may even cause failures. + * It can also be used with values that are only defined + * on SMP: + * + * struct foo { + * [...] + * #ifdef CONFIG_SMP + * int bar; + * #endif + * }; + * + * void func(struct foo *zoot) + * { + * WARN_ON_SMP(!zoot->bar); + * + * For CONFIG_SMP, WARN_ON_SMP() should act the same as WARN_ON(), + * and should be a nop and return false for uniprocessor. + * + * if (WARN_ON_SMP(x)) returns true only when CONFIG_SMP is set + * and x is true. + */ +#ifdef CONFIG_SMP +# define WARN_ON_SMP(x) WARN_ON(x) +#else +/* + * Use of ({0;}) because WARN_ON_SMP(x) may be used either as + * a stand alone line statement or as a condition in an if () + * statement. + * A simple "0" would cause gcc to give a "statement has no effect" + * warning. + */ +# define WARN_ON_SMP(x) ({0;}) +#endif + +#endif /* __ASSEMBLY__ */ + +#endif |