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Message-Id: <20240403131936.787234-15-linux@roeck-us.net>
Date: Wed, 3 Apr 2024 06:19:35 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: linux-kselftest@...r.kernel.org
Cc: David Airlie <airlied@...il.com>,
Arnd Bergmann <arnd@...db.de>,
Maíra Canal <mcanal@...lia.com>,
Dan Carpenter <dan.carpenter@...aro.org>,
Kees Cook <keescook@...omium.org>,
Daniel Diaz <daniel.diaz@...aro.org>,
David Gow <davidgow@...gle.com>,
Arthur Grillo <arthurgrillo@...eup.net>,
Brendan Higgins <brendan.higgins@...ux.dev>,
Naresh Kamboju <naresh.kamboju@...aro.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Maxime Ripard <mripard@...nel.org>,
Ville Syrjälä <ville.syrjala@...ux.intel.com>,
Daniel Vetter <daniel@...ll.ch>,
Thomas Zimmermann <tzimmermann@...e.de>,
dri-devel@...ts.freedesktop.org,
kunit-dev@...glegroups.com,
linux-arch@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org,
linux-parisc@...r.kernel.org,
linuxppc-dev@...ts.ozlabs.org,
linux-riscv@...ts.infradead.org,
linux-s390@...r.kernel.org,
linux-sh@...r.kernel.org,
loongarch@...ts.linux.dev,
netdev@...r.kernel.org,
x86@...nel.org,
Guenter Roeck <linux@...ck-us.net>,
Linux Kernel Functional Testing <lkft@...aro.org>,
Paul Walmsley <paul.walmsley@...ive.com>,
Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>
Subject: [PATCH v3 14/15] riscv: Add support for suppressing warning backtraces
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).
To simplify the implementation, unify the __BUG_ENTRY_ADDR and
__BUG_ENTRY_FILE macros into a single macro named __BUG_REL() which takes
the address, file, or function reference as parameter.
Tested-by: Linux Kernel Functional Testing <lkft@...aro.org>
Acked-by: Dan Carpenter <dan.carpenter@...aro.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>
Cc: Palmer Dabbelt <palmer@...belt.com>
Cc: Albert Ou <aou@...s.berkeley.edu>
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
v2:
- Rebased to v6.9-rc1
- Added Tested-by:, Acked-by:, and Reviewed-by: tags
- Introduced KUNIT_SUPPRESS_BACKTRACE configuration option
v3:
- Rebased to v6.9-rc2
arch/riscv/include/asm/bug.h | 38 ++++++++++++++++++++++++------------
1 file changed, 26 insertions(+), 12 deletions(-)
diff --git a/arch/riscv/include/asm/bug.h b/arch/riscv/include/asm/bug.h
index 1aaea81fb141..79f360af4ad8 100644
--- a/arch/riscv/include/asm/bug.h
+++ b/arch/riscv/include/asm/bug.h
@@ -30,26 +30,39 @@
typedef u32 bug_insn_t;
#ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS
-#define __BUG_ENTRY_ADDR RISCV_INT " 1b - ."
-#define __BUG_ENTRY_FILE RISCV_INT " %0 - ."
+#define __BUG_REL(val) RISCV_INT " " __stringify(val) " - ."
#else
-#define __BUG_ENTRY_ADDR RISCV_PTR " 1b"
-#define __BUG_ENTRY_FILE RISCV_PTR " %0"
+#define __BUG_REL(val) RISCV_PTR " " __stringify(val)
#endif
#ifdef CONFIG_DEBUG_BUGVERBOSE
+
+#ifdef CONFIG_KUNIT_SUPPRESS_BACKTRACE
+# define HAVE_BUG_FUNCTION
+# define __BUG_FUNC_PTR __BUG_REL(%1)
+#else
+# define __BUG_FUNC_PTR
+#endif /* CONFIG_KUNIT_SUPPRESS_BACKTRACE */
+
#define __BUG_ENTRY \
- __BUG_ENTRY_ADDR "\n\t" \
- __BUG_ENTRY_FILE "\n\t" \
- RISCV_SHORT " %1\n\t" \
- RISCV_SHORT " %2"
+ __BUG_REL(1b) "\n\t" \
+ __BUG_REL(%0) "\n\t" \
+ __BUG_FUNC_PTR "\n\t" \
+ RISCV_SHORT " %2\n\t" \
+ RISCV_SHORT " %3"
#else
#define __BUG_ENTRY \
- __BUG_ENTRY_ADDR "\n\t" \
- RISCV_SHORT " %2"
+ __BUG_REL(1b) "\n\t" \
+ RISCV_SHORT " %3"
#endif
#ifdef CONFIG_GENERIC_BUG
+#ifdef HAVE_BUG_FUNCTION
+# define __BUG_FUNC __func__
+#else
+# define __BUG_FUNC NULL
+#endif
+
#define __BUG_FLAGS(flags) \
do { \
__asm__ __volatile__ ( \
@@ -58,10 +71,11 @@ do { \
".pushsection __bug_table,\"aw\"\n\t" \
"2:\n\t" \
__BUG_ENTRY "\n\t" \
- ".org 2b + %3\n\t" \
+ ".org 2b + %4\n\t" \
".popsection" \
: \
- : "i" (__FILE__), "i" (__LINE__), \
+ : "i" (__FILE__), "i" (__BUG_FUNC), \
+ "i" (__LINE__), \
"i" (flags), \
"i" (sizeof(struct bug_entry))); \
} while (0)
--
2.39.2
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