summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/bug.h
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/x86/include/asm/bug.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/include/asm/bug.h')
-rw-r--r--arch/x86/include/asm/bug.h89
1 files changed, 89 insertions, 0 deletions
diff --git a/arch/x86/include/asm/bug.h b/arch/x86/include/asm/bug.h
new file mode 100644
index 000000000..a3ec87d19
--- /dev/null
+++ b/arch/x86/include/asm/bug.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_X86_BUG_H
+#define _ASM_X86_BUG_H
+
+#include <linux/stringify.h>
+#include <linux/instrumentation.h>
+#include <linux/objtool.h>
+
+/*
+ * Despite that some emulators terminate on UD2, we use it for WARN().
+ */
+#define ASM_UD2 ".byte 0x0f, 0x0b"
+#define INSN_UD2 0x0b0f
+#define LEN_UD2 2
+
+#ifdef CONFIG_GENERIC_BUG
+
+#ifdef CONFIG_X86_32
+# define __BUG_REL(val) ".long " __stringify(val)
+#else
+# define __BUG_REL(val) ".long " __stringify(val) " - ."
+#endif
+
+#ifdef CONFIG_DEBUG_BUGVERBOSE
+
+#define _BUG_FLAGS(ins, flags, extra) \
+do { \
+ asm_inline volatile("1:\t" ins "\n" \
+ ".pushsection __bug_table,\"aw\"\n" \
+ "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
+ "\t" __BUG_REL(%c0) "\t# bug_entry::file\n" \
+ "\t.word %c1" "\t# bug_entry::line\n" \
+ "\t.word %c2" "\t# bug_entry::flags\n" \
+ "\t.org 2b+%c3\n" \
+ ".popsection\n" \
+ extra \
+ : : "i" (__FILE__), "i" (__LINE__), \
+ "i" (flags), \
+ "i" (sizeof(struct bug_entry))); \
+} while (0)
+
+#else /* !CONFIG_DEBUG_BUGVERBOSE */
+
+#define _BUG_FLAGS(ins, flags, extra) \
+do { \
+ asm_inline volatile("1:\t" ins "\n" \
+ ".pushsection __bug_table,\"aw\"\n" \
+ "2:\t" __BUG_REL(1b) "\t# bug_entry::bug_addr\n" \
+ "\t.word %c0" "\t# bug_entry::flags\n" \
+ "\t.org 2b+%c1\n" \
+ ".popsection\n" \
+ extra \
+ : : "i" (flags), \
+ "i" (sizeof(struct bug_entry))); \
+} while (0)
+
+#endif /* CONFIG_DEBUG_BUGVERBOSE */
+
+#else
+
+#define _BUG_FLAGS(ins, flags, extra) asm volatile(ins)
+
+#endif /* CONFIG_GENERIC_BUG */
+
+#define HAVE_ARCH_BUG
+#define BUG() \
+do { \
+ instrumentation_begin(); \
+ _BUG_FLAGS(ASM_UD2, 0, ""); \
+ __builtin_unreachable(); \
+} while (0)
+
+/*
+ * This instrumentation_begin() is strictly speaking incorrect; but it
+ * suppresses the complaints from WARN()s in noinstr code. If such a WARN()
+ * were to trigger, we'd rather wreck the machine in an attempt to get the
+ * message out than not know about it.
+ */
+#define __WARN_FLAGS(flags) \
+do { \
+ __auto_type __flags = BUGFLAG_WARNING|(flags); \
+ instrumentation_begin(); \
+ _BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \
+ instrumentation_end(); \
+} while (0)
+
+#include <asm-generic/bug.h>
+
+#endif /* _ASM_X86_BUG_H */