process.cc revision 6701:4842482e1bd1 
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/misc.hh"
38#include "cpu/thread_context.hh"
39
40#include "mem/page_table.hh"
41
42#include "sim/process.hh"
43#include "sim/process_impl.hh"
44#include "sim/system.hh"
45
46using namespace std;
47using namespace MipsISA;
48
49MipsLiveProcess::MipsLiveProcess(LiveProcessParams * params,
50        ObjectFile *objFile)
51    : LiveProcess(params, objFile)
52{
53    // Set up stack. On MIPS, stack starts at the top of kuseg
54    // user address space. MIPS stack grows down from here
55    stack_base = 0x7FFFFFFF;
56
57    // Set pointer for next thread stack.  Reserve 8M for main stack.
58    next_thread_stack_base = stack_base - (8 * 1024 * 1024);
59
60    // Set up break point (Top of Heap)
61    brk_point = objFile->dataBase() + objFile->dataSize() + objFile->bssSize();
62    brk_point = roundUp(brk_point, VMPageSize);
63
64    // Set up region for mmaps. For now, start at bottom of kuseg space.
65    mmap_start = mmap_end = 0x10000;
66}
67
68void
69MipsLiveProcess::startup()
70{
71    Process::startup();
72
73    argsInit(MachineBytes, VMPageSize);
74}
75
76void
77MipsLiveProcess::argsInit(int intSize, int pageSize)
78{
79    // load object file into target memory
80    objFile->loadSections(initVirtMem);
81
82    // Calculate how much space we need for arg & env arrays.
83    int argv_array_size = intSize * (argv.size() + 1);
84    int envp_array_size = intSize * (envp.size() + 1);
85    int arg_data_size = 0;
86    for (vector<string>::size_type i = 0; i < argv.size(); ++i) {
87        arg_data_size += argv[i].size() + 1;
88    }
89    int env_data_size = 0;
90    for (vector<string>::size_type i = 0; i < envp.size(); ++i) {
91        env_data_size += envp[i].size() + 1;
92    }
93
94    int space_needed =
95         argv_array_size + envp_array_size + arg_data_size + env_data_size;
96    if (space_needed < 32*1024)
97        space_needed = 32*1024;
98
99    // set bottom of stack
100    stack_min = stack_base - space_needed;
101    // align it
102    stack_min = roundDown(stack_min, pageSize);
103    stack_size = stack_base - stack_min;
104    // map memory
105    pTable->allocate(stack_min, roundUp(stack_size, pageSize));
106
107    // map out initial stack contents
108    // ========
109    // NOTE: Using uint32_t hardcodes MIPS32 and not MIPS64
110    // even if MIPS64 was intended. This is because the
111    // copyStringArray function templates on the parameters.
112    // Elegant way to check intSize and vary between 32/64?
113    // ========
114    uint32_t argv_array_base = stack_min + intSize; // room for argc
115    uint32_t envp_array_base = argv_array_base + argv_array_size;
116    uint32_t arg_data_base = envp_array_base + envp_array_size;
117    uint32_t env_data_base = arg_data_base + arg_data_size;
118
119    // write contents to stack
120    uint32_t argc = argv.size();
121
122    if (intSize == 8)
123        argc = htog((uint64_t)argc);
124    else if (intSize == 4)
125        argc = htog((uint32_t)argc);
126    else
127        panic("Unknown int size");
128
129
130    initVirtMem->writeBlob(stack_min, (uint8_t*)&argc, intSize);
131
132    copyStringArray(argv, argv_array_base, arg_data_base, initVirtMem);
133
134    copyStringArray(envp, envp_array_base, env_data_base, initVirtMem);
135
136    ThreadContext *tc = system->getThreadContext(contextIds[0]);
137
138    setSyscallArg(tc, 0, argc);
139    setSyscallArg(tc, 1, argv_array_base);
140    tc->setIntReg(StackPointerReg, stack_min);
141
142    Addr prog_entry = objFile->entryPoint();
143    tc->setPC(prog_entry);
144    tc->setNextPC(prog_entry + sizeof(MachInst));
145    tc->setNextNPC(prog_entry + (2 * sizeof(MachInst)));
146}
147
148
149MipsISA::IntReg
150MipsLiveProcess::getSyscallArg(ThreadContext *tc, int &i)
151{
152    assert(i < 6);
153    return tc->readIntReg(FirstArgumentReg + i++);
154}
155
156void
157MipsLiveProcess::setSyscallArg(ThreadContext *tc,
158        int i, MipsISA::IntReg val)
159{
160    assert(i < 6);
161    tc->setIntReg(FirstArgumentReg + i, val);
162}
163
164void
165MipsLiveProcess::setSyscallReturn(ThreadContext *tc,
166        SyscallReturn return_value)
167{
168    if (return_value.successful()) {
169        // no error
170        tc->setIntReg(SyscallSuccessReg, 0);
171        tc->setIntReg(ReturnValueReg, return_value.value());
172    } else {
173        // got an error, return details
174        tc->setIntReg(SyscallSuccessReg, (IntReg) -1);
175        tc->setIntReg(ReturnValueReg, -return_value.value());
176    }
177}
178