process.cc revision 7532:3f6413fc37a2 
1/*
2 * Copyright (c) 2004-2005 The Regents of The University of Michigan
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;
9 * redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution;
12 * neither the name of the copyright holders nor the names of its
13 * contributors may be used to endorse or promote products derived from
14 * this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * Authors: Gabe Black
29 *          Ali Saidi
30 *          Korey Sewell
31 */
32
33#include "arch/mips/isa_traits.hh"
34#include "arch/mips/process.hh"
35
36#include "base/loader/object_file.hh"
37#include "base/loader/elf_object.hh"
38#include "base/misc.hh"
39#include "cpu/thread_context.hh"
40
41#include "mem/page_table.hh"
42
43#include "sim/process.hh"
44#include "sim/process_impl.hh"
45#include "sim/system.hh"
46
47using namespace std;
48using namespace MipsISA;
49
50MipsLiveProcess::MipsLiveProcess(LiveProcessParams * params,
51        ObjectFile *objFile)
52    : LiveProcess(params, objFile)
53{
54    // Set up stack. On MIPS, stack starts at the top of kuseg
55    // user address space. MIPS stack grows down from here
56    stack_base = 0x7FFFFFFF;
57
58    // Set pointer for next thread stack.  Reserve 8M for main stack.
59    next_thread_stack_base = stack_base - (8 * 1024 * 1024);
60
61    // Set up break point (Top of Heap)
62    brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
63    brk_point = roundUp(brk_point, VMPageSize);
64
65    // Set up region for mmaps.  Start it 1GB above the top of the heap.
66    mmap_start = mmap_end = brk_point + 0x40000000L;
67}
68
69void
70MipsLiveProcess::initState()
71{
72    LiveProcess::initState();
73
74    argsInit<uint32_t>(VMPageSize);
75}
76
77template<class IntType>
78void
79MipsLiveProcess::argsInit(int pageSize)
80{
81    int intSize = sizeof(IntType);
82
83    // load object file into target memory
84    objFile->loadSections(initVirtMem);
85
86    typedef AuxVector<IntType> auxv_t;
87    std::vector<auxv_t> auxv;
88
89    ElfObject * elfObject = dynamic_cast<ElfObject *>(objFile);
90    if (elfObject)
91    {
92        // Set the system page size
93        auxv.push_back(auxv_t(M5_AT_PAGESZ, MipsISA::VMPageSize));
94        // Set the frequency at which time() increments
95        auxv.push_back(auxv_t(M5_AT_CLKTCK, 100));
96        // For statically linked executables, this is the virtual
97        // address of the program header tables if they appear in the
98        // executable image.
99        auxv.push_back(auxv_t(M5_AT_PHDR, elfObject->programHeaderTable()));
100        DPRINTF(Loader, "auxv at PHDR %08p\n", elfObject->programHeaderTable());
101        // This is the size of a program header entry from the elf file.
102        auxv.push_back(auxv_t(M5_AT_PHENT, elfObject->programHeaderSize()));
103        // This is the number of program headers from the original elf file.
104        auxv.push_back(auxv_t(M5_AT_PHNUM, elfObject->programHeaderCount()));
105        //The entry point to the program
106        auxv.push_back(auxv_t(M5_AT_ENTRY, objFile->entryPoint()));
107        //Different user and group IDs
108        auxv.push_back(auxv_t(M5_AT_UID, uid()));
109        auxv.push_back(auxv_t(M5_AT_EUID, euid()));
110        auxv.push_back(auxv_t(M5_AT_GID, gid()));
111        auxv.push_back(auxv_t(M5_AT_EGID, egid()));
112    }
113
114    // Calculate how much space we need for arg & env & auxv arrays.
115    int argv_array_size = intSize * (argv.size() + 1);
116    int envp_array_size = intSize * (envp.size() + 1);
117    int auxv_array_size = intSize * 2 * (auxv.size() + 1);
118
119    int arg_data_size = 0;
120    for (vector<string>::size_type i = 0; i < argv.size(); ++i) {
121        arg_data_size += argv[i].size() + 1;
122    }
123    int env_data_size = 0;
124    for (vector<string>::size_type i = 0; i < envp.size(); ++i) {
125        env_data_size += envp[i].size() + 1;
126    }
127
128    int space_needed =
129        argv_array_size +
130        envp_array_size +
131        auxv_array_size +
132        arg_data_size +
133        env_data_size;
134
135    // set bottom of stack
136    stack_min = stack_base - space_needed;
137    // align it
138    stack_min = roundDown(stack_min, pageSize);
139    stack_size = stack_base - stack_min;
140    // map memory
141    pTable->allocate(stack_min, roundUp(stack_size, pageSize));
142
143    // map out initial stack contents
144    IntType argv_array_base = stack_min + intSize; // room for argc
145    IntType envp_array_base = argv_array_base + argv_array_size;
146    IntType auxv_array_base = envp_array_base + envp_array_size;
147    IntType arg_data_base = auxv_array_base + auxv_array_size;
148    IntType env_data_base = arg_data_base + arg_data_size;
149
150    // write contents to stack
151    IntType argc = argv.size();
152
153    argc = htog((IntType)argc);
154
155    initVirtMem->writeBlob(stack_min, (uint8_t*)&argc, intSize);
156
157    copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
158
159    copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
160
161    // Copy the aux vector
162    for (typename vector<auxv_t>::size_type x = 0; x < auxv.size(); x++) {
163        initVirtMem->writeBlob(auxv_array_base + x * 2 * intSize,
164                (uint8_t*)&(auxv[x].a_type), intSize);
165        initVirtMem->writeBlob(auxv_array_base + (x * 2 + 1) * intSize,
166                (uint8_t*)&(auxv[x].a_val), intSize);
167    }
168
169    // Write out the terminating zeroed auxilliary vector
170    for (unsigned i = 0; i < 2; i++) {
171        const IntType zero = 0;
172        const Addr addr = auxv_array_base + 2 * intSize * (auxv.size() + i);
173        initVirtMem->writeBlob(addr, (uint8_t*)&zero, intSize);
174    }
175
176    ThreadContext *tc = system->getThreadContext(contextIds[0]);
177
178    setSyscallArg(tc, 0, argc);
179    setSyscallArg(tc, 1, argv_array_base);
180    tc->setIntReg(StackPointerReg, stack_min);
181
182    Addr prog_entry = objFile->entryPoint();
183    tc->setPC(prog_entry);
184    tc->setNextPC(prog_entry + sizeof(MachInst));
185    tc->setNextNPC(prog_entry + (2 * sizeof(MachInst)));
186}
187
188
189MipsISA::IntReg
190MipsLiveProcess::getSyscallArg(ThreadContext *tc, int &i)
191{
192    assert(i < 6);
193    return tc->readIntReg(FirstArgumentReg + i++);
194}
195
196void
197MipsLiveProcess::setSyscallArg(ThreadContext *tc,
198        int i, MipsISA::IntReg val)
199{
200    assert(i < 6);
201    tc->setIntReg(FirstArgumentReg + i, val);
202}
203
204void
205MipsLiveProcess::setSyscallReturn(ThreadContext *tc,
206        SyscallReturn return_value)
207{
208    if (return_value.successful()) {
209        // no error
210        tc->setIntReg(SyscallSuccessReg, 0);
211        tc->setIntReg(ReturnValueReg, return_value.value());
212    } else {
213        // got an error, return details
214        tc->setIntReg(SyscallSuccessReg, (IntReg) -1);
215        tc->setIntReg(ReturnValueReg, -return_value.value());
216    }
217}
218