From: Guenter Roeck linux@roeck-us.net
Add name of functions triggering warning backtraces to the __bug_table object section to enable support for suppressing WARNING backtraces.
To limit image size impact, the pointer to the function name is only added to the __bug_table section if both CONFIG_KUNIT_SUPPRESS_BACKTRACE and CONFIG_DEBUG_BUGVERBOSE are enabled. Otherwise, the __func__ assembly parameter is replaced with a (dummy) NULL parameter to avoid an image size increase due to unused __func__ entries (this is necessary because __func__ is not a define but a virtual variable).
Tested-by: Linux Kernel Functional Testing lkft@linaro.org Acked-by: Dan Carpenter dan.carpenter@linaro.org Cc: Yoshinori Sato ysato@users.sourceforge.jp Cc: Rich Felker dalias@libc.org Cc: John Paul Adrian Glaubitz glaubitz@physik.fu-berlin.de Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Alessandro Carminati acarmina@redhat.com --- arch/sh/include/asm/bug.h | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-)
diff --git a/arch/sh/include/asm/bug.h b/arch/sh/include/asm/bug.h index 05a485c4fabc..470ce6567d20 100644 --- a/arch/sh/include/asm/bug.h +++ b/arch/sh/include/asm/bug.h @@ -24,21 +24,36 @@ * The offending file and line are encoded in the __bug_table section. */ #ifdef CONFIG_DEBUG_BUGVERBOSE + +#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE +# define HAVE_BUG_FUNCTION +# define __BUG_FUNC_PTR "\t.long %O2\n" +#else +# define __BUG_FUNC_PTR +#endif /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */ + #define _EMIT_BUG_ENTRY \ "\t.pushsection __bug_table,"aw"\n" \ "2:\t.long 1b, %O1\n" \ - "\t.short %O2, %O3\n" \ - "\t.org 2b+%O4\n" \ + __BUG_FUNC_PTR \ + "\t.short %O3, %O4\n" \ + "\t.org 2b+%O5\n" \ "\t.popsection\n" #else #define _EMIT_BUG_ENTRY \ "\t.pushsection __bug_table,"aw"\n" \ "2:\t.long 1b\n" \ - "\t.short %O3\n" \ - "\t.org 2b+%O4\n" \ + "\t.short %O4\n" \ + "\t.org 2b+%O5\n" \ "\t.popsection\n" #endif
+#ifdef HAVE_BUG_FUNCTION +# define __BUG_FUNC __func__ +#else +# define __BUG_FUNC NULL +#endif + #define BUG() \ do { \ __asm__ __volatile__ ( \ @@ -47,6 +62,7 @@ do { \ : \ : "n" (TRAPA_BUG_OPCODE), \ "i" (__FILE__), \ + "i" (__BUG_FUNC), \ "i" (__LINE__), "i" (0), \ "i" (sizeof(struct bug_entry))); \ unreachable(); \ @@ -60,6 +76,7 @@ do { \ : \ : "n" (TRAPA_BUG_OPCODE), \ "i" (__FILE__), \ + "i" (__BUG_FUNC), \ "i" (__LINE__), \ "i" (BUGFLAG_WARNING|(flags)), \ "i" (sizeof(struct bug_entry))); \ @@ -85,6 +102,7 @@ do { \ : \ : "n" (TRAPA_BUG_OPCODE), \ "i" (__FILE__), \ + "i" (__BUG_FUNC), \ "i" (__LINE__), \ "i" (BUGFLAG_UNWINDER), \ "i" (sizeof(struct bug_entry))); \