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https://github.com/Fishwaldo/linux-bl808.git
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19d436268d
Josh suggested moving the _ONCE logic inside the trap handler, using a bit in the bug_entry::flags field, avoiding the need for the extra variable. Sadly this only works for WARN_ON_ONCE(), since the others have printk() statements prior to triggering the trap. Still, this saves a fair amount of text and some data: text data filename 10682460 4530992 defconfig-build/vmlinux.orig 10665111 4530096 defconfig-build/vmlinux.patched Suggested-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
119 lines
2.7 KiB
C
119 lines
2.7 KiB
C
#ifndef __ASM_SH_BUG_H
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#define __ASM_SH_BUG_H
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#include <linux/linkage.h>
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#define TRAPA_BUG_OPCODE 0xc33e /* trapa #0x3e */
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#define BUGFLAG_UNWINDER (1 << 1)
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#ifdef CONFIG_GENERIC_BUG
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#define HAVE_ARCH_BUG
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#define HAVE_ARCH_WARN_ON
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/**
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* _EMIT_BUG_ENTRY
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* %1 - __FILE__
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* %2 - __LINE__
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* %3 - trap type
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* %4 - sizeof(struct bug_entry)
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*
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* The trapa opcode itself sits in %0.
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* The %O notation is used to avoid # generation.
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*
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* The offending file and line are encoded in the __bug_table section.
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*/
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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#define _EMIT_BUG_ENTRY \
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"\t.pushsection __bug_table,\"a\"\n" \
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"2:\t.long 1b, %O1\n" \
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"\t.short %O2, %O3\n" \
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"\t.org 2b+%O4\n" \
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"\t.popsection\n"
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#else
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#define _EMIT_BUG_ENTRY \
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"\t.pushsection __bug_table,\"a\"\n" \
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"2:\t.long 1b\n" \
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"\t.short %O3\n" \
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"\t.org 2b+%O4\n" \
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"\t.popsection\n"
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#endif
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#define BUG() \
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do { \
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__asm__ __volatile__ ( \
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"1:\t.short %O0\n" \
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_EMIT_BUG_ENTRY \
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: \
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: "n" (TRAPA_BUG_OPCODE), \
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"i" (__FILE__), \
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"i" (__LINE__), "i" (0), \
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"i" (sizeof(struct bug_entry))); \
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} while (0)
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#define __WARN_FLAGS(flags) \
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do { \
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__asm__ __volatile__ ( \
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"1:\t.short %O0\n" \
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_EMIT_BUG_ENTRY \
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: \
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: "n" (TRAPA_BUG_OPCODE), \
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"i" (__FILE__), \
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"i" (__LINE__), \
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"i" (BUGFLAG_WARNING|(flags)), \
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"i" (sizeof(struct bug_entry))); \
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} while (0)
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#define WARN_ON(x) ({ \
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int __ret_warn_on = !!(x); \
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if (__builtin_constant_p(__ret_warn_on)) { \
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if (__ret_warn_on) \
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__WARN(); \
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} else { \
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if (unlikely(__ret_warn_on)) \
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__WARN(); \
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} \
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unlikely(__ret_warn_on); \
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})
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#define UNWINDER_BUG() \
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do { \
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__asm__ __volatile__ ( \
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"1:\t.short %O0\n" \
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_EMIT_BUG_ENTRY \
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: \
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: "n" (TRAPA_BUG_OPCODE), \
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"i" (__FILE__), \
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"i" (__LINE__), \
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"i" (BUGFLAG_UNWINDER), \
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"i" (sizeof(struct bug_entry))); \
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} while (0)
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#define UNWINDER_BUG_ON(x) ({ \
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int __ret_unwinder_on = !!(x); \
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if (__builtin_constant_p(__ret_unwinder_on)) { \
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if (__ret_unwinder_on) \
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UNWINDER_BUG(); \
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} else { \
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if (unlikely(__ret_unwinder_on)) \
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UNWINDER_BUG(); \
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} \
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unlikely(__ret_unwinder_on); \
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})
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#else
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#define UNWINDER_BUG BUG
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#define UNWINDER_BUG_ON BUG_ON
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#endif /* CONFIG_GENERIC_BUG */
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#include <asm-generic/bug.h>
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struct pt_regs;
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/* arch/sh/kernel/traps.c */
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extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
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extern void die_if_kernel(const char *str, struct pt_regs *regs, long err);
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extern void die_if_no_fixup(const char *str, struct pt_regs *regs, long err);
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#endif /* __ASM_SH_BUG_H */
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