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/*
* Copyright (c) 2017-2019, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* * Neither the name of Intel Corporation nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PT_SB_CONTEXT_H
#define PT_SB_CONTEXT_H
#include <stdint.h>
struct pt_image;
/* The ABI of the process. */
enum pt_sb_abi {
pt_sb_abi_unknown,
pt_sb_abi_x64,
pt_sb_abi_x32,
pt_sb_abi_ia32
};
struct pt_sb_context {
/* The next context in a linear list of process contexts.
*
* I do not expect more than a few processes per tracing session. And
* if we had many processes, we'd also have trace spanning many context
* switches and sideband decode won't be the bottleneck.
*
* This field is owned by the sideband tracing session to which this
* context belongs.
*/
struct pt_sb_context *next;
/* The memory image of that process.
*
* You must hold a reference to this context as long as @image is used.
*/
struct pt_image *image;
/* The ABI of the process.
*
* This may be relevant for some but not all sideband formats.
*
* This field is collectively owned by all sideband decoders.
*/
enum pt_sb_abi abi;
/* We identify processes by their process id.
*
* Intel PT provides CR3 and VMCS Base to identify address-spaces and
* notifies us about changes. But at least on Linux, we don't get the
* CR3 and all sideband records refer to pid/tid, so we're using those.
*/
uint32_t pid;
/* The number of current users.
*
* We remove a context when the process exits but we keep the context
* object and its image alive as long as they are used.
*/
uint16_t ucount;
};
/* Allocate a context.
*
* Allocate a context and an image. The optional @name argument is given to the
* context's image.
*
* The context's use-count is initialized to one. Use pt_sb_ctx_put() to free
* the returned context and its image.
*
* Returns a non-NULL context or NULL when out of memory.
*/
extern struct pt_sb_context *pt_sb_ctx_alloc(const char *name);
#endif /* PT_SB_CONTEXT_H */
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