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95 lines
2.5 KiB
95 lines
2.5 KiB
/* 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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#include <linux/instrumentation.h> |
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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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#ifdef CONFIG_GENERIC_BUG |
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#ifdef CONFIG_X86_32 |
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# define __BUG_REL(val) ".long " __stringify(val) |
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#else |
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# define __BUG_REL(val) ".long " __stringify(val) " - 2b" |
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#endif |
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#ifdef CONFIG_DEBUG_BUGVERBOSE |
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#define _BUG_FLAGS(ins, flags) \ |
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do { \ |
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asm_inline volatile("1:\t" ins "\n" \ |
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".pushsection __bug_table,\"aw\"\n" \ |
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"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
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"\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \ |
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"\t.word %c1" "\t# bug_entry::line\n" \ |
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"\t.word %c2" "\t# bug_entry::flags\n" \ |
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"\t.org 2b+%c3\n" \ |
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".popsection" \ |
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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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#else /* !CONFIG_DEBUG_BUGVERBOSE */ |
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#define _BUG_FLAGS(ins, flags) \ |
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do { \ |
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asm_inline volatile("1:\t" ins "\n" \ |
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".pushsection __bug_table,\"aw\"\n" \ |
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"2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \ |
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"\t.word %c0" "\t# bug_entry::flags\n" \ |
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"\t.org 2b+%c1\n" \ |
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".popsection" \ |
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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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#endif /* CONFIG_DEBUG_BUGVERBOSE */ |
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#else |
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#define _BUG_FLAGS(ins, flags) asm volatile(ins) |
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#endif /* CONFIG_GENERIC_BUG */ |
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#define HAVE_ARCH_BUG |
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#define BUG() \ |
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do { \ |
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instrumentation_begin(); \ |
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_BUG_FLAGS(ASM_UD2, 0); \ |
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unreachable(); \ |
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} while (0) |
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/* |
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* This instrumentation_begin() is strictly speaking incorrect; but it |
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* suppresses the complaints from WARN()s in noinstr code. If such a WARN() |
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* were to trigger, we'd rather wreck the machine in an attempt to get the |
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* message out than not know about it. |
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*/ |
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#define __WARN_FLAGS(flags) \ |
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do { \ |
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instrumentation_begin(); \ |
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_BUG_FLAGS(ASM_UD2, BUGFLAG_WARNING|(flags)); \ |
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annotate_reachable(); \ |
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instrumentation_end(); \ |
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} while (0) |
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#include <asm-generic/bug.h> |
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#endif /* _ASM_X86_BUG_H */
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