mirror of
https://github.com/DynamoRIO/dynamorio.git
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Bin Wang
92c0123464
Building the kernel module with clang fails with `-Werror`. This PR fixes two errors while keeping the gcc builds working. - `kernel_interface.h`: clang does not support the `gnu_printf` format archetype (`-Wignored-attributes`). Use `__printf__` instead, which is portable across both gcc and clang. - `instrument.c`: clang inlines `add_client_lib()` into `instrument_load_client_libs()`. That combines the 2 KiB option buffer with the 3 KiB error-message buffers from the load-failure path and exceeds the module's `-Wframe-larger-than=4096`: ``` error: stack frame size (5176) exceeds limit (4096) in 'instrument_load_client_libs' [-Werror,-Wframe-larger-than] ``` Move the load-failure reporting into a NOINLINE helper (`report_client_lib_load_error()`) so those buffers are on the stack only when a client library fails to load. No functional change. Issue: #8021
119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/* **********************************************************
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* Copyright (c) 2026 Google, Inc. All rights reserved.
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* Copyright (c) 2013 Peter Feiner. All rights reserved.
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* **********************************************************/
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/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* * Neither the name of Google, Inc. nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*/
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#ifndef _KERNEL_INTERFACE_H_
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#define _KERNEL_INTERFACE_H_
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#include <linux/types.h>
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int
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kernel_module_init(size_t dr_heap_size);
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void
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kernel_module_exit(void);
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size_t
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kernel_get_heap_size(void);
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void *
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kernel_allocate_heap(size_t size);
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void *
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kernel_find_symbol(const char *name, size_t *size);
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int
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kernel_get_cpu_id(void);
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int
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kernel_get_online_processor_count(void);
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/* Reports the per-CPU buffer capacity and alignment in bytes. Both output pointers
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* must be non-NULL. Does not require preemption to be disabled.
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*/
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void
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kernel_get_cpu_local_state_layout(size_t *size, size_t *alignment);
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/* Returns the current CPU's buffer as an ordinary pointer. The caller must keep
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* preemption disabled for the entire duration of access through the returned pointer.
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* Storage is initially zero and remains allocated until module unload.
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* This function never returns NULL: the module loader allocates dr_cpu_local_storage
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* before module initialization, and fails the module load if it cannot allocate.
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*/
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void *
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kernel_get_cpu_local_state(void);
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size_t
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kernel_get_page_size(void);
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void *
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kernel_get_image_start(void);
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void *
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kernel_get_image_end(void);
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/* Returns whether the |size| bytes at |addr| can be read without faulting. Handles both
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* kernel and user addresses. Acquires no locks and never sleeps, so it is safe to call
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* in any context. A zero |size| returns true.
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*/
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bool
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kernel_is_readable_without_fault(const void *addr, size_t size);
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unsigned int
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kernel_query_time_seconds(void);
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__attribute__((format(__printf__, 1, 2))) void
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kernel_printk(const char *fmt, ...);
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__attribute__((noreturn)) void
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kernel_panic(const char *message);
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#define KERNEL_ENV_NAME_MAX 64
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#define KERNEL_ENV_VALUE_MAX 2048
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/* Sets the environment variable |name| to |value|, overwriting the value of any existing
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* entry with the same name. Returns 0 on success, -EINVAL for a NULL/empty name, a name
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* containing '=', or a NULL value, -E2BIG if the name or value exceeds the maximum
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* length, and -ENOSPC if the table is full and no entry with |name| exists.
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*/
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int
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kernel_setenv(const char *name, const char *value);
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/* Returns the value of the environment variable |name|, or NULL if it is not set.
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* Malformed names (NULL, empty, or containing '=') also return NULL, mirroring
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* our_getenv() in core/unix/os.c.
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*/
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const char *
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kernel_getenv(const char *name);
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#endif /* _KERNEL_INTERFACE_H_ */
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