1 /*
2  * \file       trc_tgt_mem_access_i.h
3  * \brief      OpenCSD : Target memory read interface.
4  *
5  * \copyright  Copyright (c) 2015, ARM Limited. All Rights Reserved.
6  */
7 
8 /*
9  * Redistribution and use in source and binary forms, with or without modification,
10  * are permitted provided that the following conditions are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright notice,
13  * this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright notice,
16  * this list of conditions and the following disclaimer in the documentation
17  * and/or other materials provided with the distribution.
18  *
19  * 3. Neither the name of the copyright holder nor the names of its contributors
20  * may be used to endorse or promote products derived from this software without
21  * specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
25  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26  * IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
29  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
30  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  */
34 
35 #ifndef ARM_TRC_TGT_MEM_ACCESS_I_H_INCLUDED
36 #define ARM_TRC_TGT_MEM_ACCESS_I_H_INCLUDED
37 
38 /*!
39  * @class ITargetMemAccess
40  *
41  * @brief Interface to target memory access.
42  *
43  * @ingroup ocsd_interfaces
44  *
45  * Read Target memory call is used by the decoder to access the memory location in the
46  * target memory space for the next instruction(s) to be traced.
47  *
48  * Memory data returned is to be little-endian.
49  *
50  * The implementator of this interface could either use file(s) containing dumps of memory
51  * locations from the target, be an elf file reader extracting code, or a live target
52  * connection, depending on the tool execution context.
53  *
54  *
55  */
56 class ITargetMemAccess
57 {
58 public:
ITargetMemAccess()59     ITargetMemAccess() {}; /**< default interface constructor */
~ITargetMemAccess()60     virtual ~ITargetMemAccess() {}; /**< default interface destructor */
61 
62     /*!
63      * Read a block of target memory into supplied buffer.
64      *
65      * Bytes read set less than bytes required, along with a success return code indicates full memory
66      * location not accessible. Function will return all accessible bytes from the address up to the point
67      * where the first inaccessible location appears.
68      *
69      * The cs_trace_id associates a memory read with a core. Different cores may have different memory spaces,
70      * the memory access may take this into account. Access will first look in the registered memory areas
71      * associated with the ID, failing that will look into any global memory spaces.
72      *
73      * @param address : Address to access.
74      * @param cs_trace_id : protocol source trace ID.
75      * @param mem_space : Memory space to access, (secure, non-secure, optionally with EL, or any).
76      * @param num_bytes : [in] Number of bytes required. [out] Number of bytes actually read.
77      * @param *p_buffer : Buffer to fill with the bytes.
78      *
79      * @return ocsd_err_t : OCSD_OK on successful access (including memory not available)
80      */
81     virtual ocsd_err_t ReadTargetMemory(   const ocsd_vaddr_t address,
82                                             const uint8_t cs_trace_id,
83                                             const ocsd_mem_space_acc_t mem_space,
84                                             uint32_t *num_bytes,
85                                             uint8_t *p_buffer) = 0;
86 
87     /*!
88      * Invalidate any caching that the memory accessor functions are using.
89      * Generally called when a memory context changes in the trace.
90      *
91      * @param cs_trace_id : protocol source trace ID.
92      */
93     virtual void InvalidateMemAccCache(const uint8_t cs_trace_id) = 0;
94 };
95 
96 
97 #endif // ARM_TRC_TGT_MEM_ACCESS_I_H_INCLUDED
98 
99 /* End of File trc_tgt_mem_access_i.h */
100