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e0ddec73fd
A number of internal functions in kcov are only called from generated code
and don't technically need a declaration, but 'make W=1' warns about
global symbols without a prototype:
kernel/kcov.c:199:14: error: no previous prototype for '__sanitizer_cov_trace_pc' [-Werror=missing-prototypes]
kernel/kcov.c:264:14: error: no previous prototype for '__sanitizer_cov_trace_cmp1' [-Werror=missing-prototypes]
kernel/kcov.c:270:14: error: no previous prototype for '__sanitizer_cov_trace_cmp2' [-Werror=missing-prototypes]
kernel/kcov.c:276:14: error: no previous prototype for '__sanitizer_cov_trace_cmp4' [-Werror=missing-prototypes]
kernel/kcov.c:282:14: error: no previous prototype for '__sanitizer_cov_trace_cmp8' [-Werror=missing-prototypes]
kernel/kcov.c:288:14: error: no previous prototype for '__sanitizer_cov_trace_const_cmp1' [-Werror=missing-prototypes]
kernel/kcov.c:295:14: error: no previous prototype for '__sanitizer_cov_trace_const_cmp2' [-Werror=missing-prototypes]
kernel/kcov.c:302:14: error: no previous prototype for '__sanitizer_cov_trace_const_cmp4' [-Werror=missing-prototypes]
kernel/kcov.c:309:14: error: no previous prototype for '__sanitizer_cov_trace_const_cmp8' [-Werror=missing-prototypes]
kernel/kcov.c:316:14: error: no previous prototype for '__sanitizer_cov_trace_switch' [-Werror=missing-prototypes]
Adding prototypes for these in a header solves that problem, but now there
is a mismatch between the built-in type and the prototype on 64-bit
architectures because they expect some functions to take a 64-bit
'unsigned long' argument rather than an 'unsigned long long' u64 type:
include/linux/kcov.h:84:6: error: conflicting types for built-in function '__sanitizer_cov_trace_switch'; expected 'void(long long unsigned int, void *)' [-Werror=builtin-declaration-mismatch]
84 | void __sanitizer_cov_trace_switch(u64 val, u64 *cases);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Avoid this as well with a custom type definition.
Link: https://lkml.kernel.org/r/20230517124944.929997-1-arnd@kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Rong Tao <rongtao@cestc.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
110 lines
3.1 KiB
C
110 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_KCOV_H
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#define _LINUX_KCOV_H
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#include <linux/sched.h>
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#include <uapi/linux/kcov.h>
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struct task_struct;
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#ifdef CONFIG_KCOV
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enum kcov_mode {
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/* Coverage collection is not enabled yet. */
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KCOV_MODE_DISABLED = 0,
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/* KCOV was initialized, but tracing mode hasn't been chosen yet. */
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KCOV_MODE_INIT = 1,
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/*
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* Tracing coverage collection mode.
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* Covered PCs are collected in a per-task buffer.
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*/
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KCOV_MODE_TRACE_PC = 2,
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/* Collecting comparison operands mode. */
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KCOV_MODE_TRACE_CMP = 3,
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};
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#define KCOV_IN_CTXSW (1 << 30)
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void kcov_task_init(struct task_struct *t);
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void kcov_task_exit(struct task_struct *t);
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#define kcov_prepare_switch(t) \
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do { \
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(t)->kcov_mode |= KCOV_IN_CTXSW; \
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} while (0)
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#define kcov_finish_switch(t) \
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do { \
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(t)->kcov_mode &= ~KCOV_IN_CTXSW; \
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} while (0)
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/* See Documentation/dev-tools/kcov.rst for usage details. */
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void kcov_remote_start(u64 handle);
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void kcov_remote_stop(void);
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u64 kcov_common_handle(void);
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static inline void kcov_remote_start_common(u64 id)
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{
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kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_COMMON, id));
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}
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static inline void kcov_remote_start_usb(u64 id)
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{
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kcov_remote_start(kcov_remote_handle(KCOV_SUBSYSTEM_USB, id));
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}
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/*
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* The softirq flavor of kcov_remote_*() functions is introduced as a temporary
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* work around for kcov's lack of nested remote coverage sections support in
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* task context. Adding support for nested sections is tracked in:
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* https://bugzilla.kernel.org/show_bug.cgi?id=210337
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*/
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static inline void kcov_remote_start_usb_softirq(u64 id)
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{
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if (in_serving_softirq())
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kcov_remote_start_usb(id);
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}
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static inline void kcov_remote_stop_softirq(void)
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{
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if (in_serving_softirq())
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kcov_remote_stop();
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}
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#ifdef CONFIG_64BIT
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typedef unsigned long kcov_u64;
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#else
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typedef unsigned long long kcov_u64;
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#endif
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void __sanitizer_cov_trace_pc(void);
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void __sanitizer_cov_trace_cmp1(u8 arg1, u8 arg2);
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void __sanitizer_cov_trace_cmp2(u16 arg1, u16 arg2);
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void __sanitizer_cov_trace_cmp4(u32 arg1, u32 arg2);
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void __sanitizer_cov_trace_cmp8(kcov_u64 arg1, kcov_u64 arg2);
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void __sanitizer_cov_trace_const_cmp1(u8 arg1, u8 arg2);
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void __sanitizer_cov_trace_const_cmp2(u16 arg1, u16 arg2);
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void __sanitizer_cov_trace_const_cmp4(u32 arg1, u32 arg2);
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void __sanitizer_cov_trace_const_cmp8(kcov_u64 arg1, kcov_u64 arg2);
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void __sanitizer_cov_trace_switch(kcov_u64 val, void *cases);
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#else
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static inline void kcov_task_init(struct task_struct *t) {}
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static inline void kcov_task_exit(struct task_struct *t) {}
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static inline void kcov_prepare_switch(struct task_struct *t) {}
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static inline void kcov_finish_switch(struct task_struct *t) {}
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static inline void kcov_remote_start(u64 handle) {}
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static inline void kcov_remote_stop(void) {}
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static inline u64 kcov_common_handle(void)
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{
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return 0;
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}
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static inline void kcov_remote_start_common(u64 id) {}
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static inline void kcov_remote_start_usb(u64 id) {}
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static inline void kcov_remote_start_usb_softirq(u64 id) {}
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static inline void kcov_remote_stop_softirq(void) {}
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#endif /* CONFIG_KCOV */
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#endif /* _LINUX_KCOV_H */
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