100 lines
2.1 KiB
C
100 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_X86_BUG_H
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#define _ASM_X86_BUG_H
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#include <linux/stringify.h>
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#ifndef __ASSEMBLY__
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/*
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* Despite that some emulators terminate on UD2, we use it for WARN().
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*
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* Since various instruction decoders/specs disagree on the encoding of
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* UD0/UD1.
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*/
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#define ASM_UD0 ".byte 0x0f, 0xff" /* + ModRM (for Intel) */
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#define ASM_UD1 ".byte 0x0f, 0xb9" /* + ModRM */
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#define ASM_UD2 ".byte 0x0f, 0x0b"
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#define INSN_UD0 0xff0f
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#define INSN_UD2 0x0b0f
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#define LEN_UD2 2
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#define _BUG_FLAGS(ins, flags) \
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do { \
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asm volatile("ASM_BUG ins=\"" ins "\" file=%c0 line=%c1 " \
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"flags=%c2 size=%c3" \
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: : "i" (__FILE__), "i" (__LINE__), \
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"i" (flags), \
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"i" (sizeof(struct bug_entry))); \
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} while (0)
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#define HAVE_ARCH_BUG
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#define BUG() \
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do { \
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_BUG_FLAGS(ASM_UD2, 0); \
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unreachable(); \
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} while (0)
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#define __WARN_FLAGS(flags) \
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do { \
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_BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \
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annotate_reachable(); \
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} while (0)
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#include <asm-generic/bug.h>
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#else /* __ASSEMBLY__ */
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#ifdef CONFIG_GENERIC_BUG
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#ifdef CONFIG_X86_32
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.macro __BUG_REL val:req
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.long \val
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.endm
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#else
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.macro __BUG_REL val:req
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.long \val - 2b
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.endm
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#endif
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#ifdef CONFIG_DEBUG_BUGVERBOSE
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.macro ASM_BUG ins:req file:req line:req flags:req size:req
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1: \ins
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.pushsection __bug_table,"aw"
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2: __BUG_REL val=1b # bug_entry::bug_addr
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__BUG_REL val=\file # bug_entry::file
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.word \line # bug_entry::line
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.word \flags # bug_entry::flags
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.org 2b+\size
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.popsection
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.endm
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#else /* !CONFIG_DEBUG_BUGVERBOSE */
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.macro ASM_BUG ins:req file:req line:req flags:req size:req
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1: \ins
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.pushsection __bug_table,"aw"
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2: __BUG_REL val=1b # bug_entry::bug_addr
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.word \flags # bug_entry::flags
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.org 2b+\size
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.popsection
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.endm
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#endif /* CONFIG_DEBUG_BUGVERBOSE */
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#else /* CONFIG_GENERIC_BUG */
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.macro ASM_BUG ins:req file:req line:req flags:req size:req
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\ins
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.endm
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#endif /* CONFIG_GENERIC_BUG */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_BUG_H */
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