system.cc revision 5268:5bfc53fe60e7 
1/*
2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * Copyright (c) 2007 MIPS Technologies, Inc.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met: redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer;
10 * redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution;
13 * neither the name of the copyright holders nor the names of its
14 * contributors may be used to endorse or promote products derived from
15 * this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
18 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
19 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
20 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
21 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
22 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
23 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
27 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * Authors: Ali Saidi
30 *          Nathan Binkert
31 *          Jaidev Patwardhan
32 */
33
34#include "arch/mips/system.hh"
35#include "arch/vtophys.hh"
36#include "base/remote_gdb.hh"
37#include "base/loader/object_file.hh"
38#include "base/loader/hex_file.hh"
39#include "base/loader/symtab.hh"
40#include "base/trace.hh"
41#include "mem/physical.hh"
42#include "params/MipsSystem.hh"
43#include "sim/byteswap.hh"
44
45
46using namespace LittleEndianGuest;
47
48MipsSystem::MipsSystem(Params *p)
49    : System(p)
50{
51
52#if FULL_SYSTEM
53    if (p->bare_iron == true) {
54        hexFile = new HexFile(params()->hex_file_name);
55        if(!hexFile->loadSections(&functionalPort,MipsISA::LoadAddrMask))
56            panic("Could not load hex file\n");
57    }
58
59    Addr addr = 0;
60    /* Comment out old Alpha Based Code
61
62     Don't need the console before we start looking at booting linux */
63
64
65    consoleSymtab = new SymbolTable;
66
67
68    /**
69     * Load the console code into memory
70     */
71    //    Load Console Code
72    console = createObjectFile(params()->console);
73
74    warn("console code is located at: %s\n", params()->console);
75
76    if (console == NULL)
77        fatal("Could not load console file %s", params()->console);
78    //Load program sections into memory
79     console->loadSections(&functionalPort, MipsISA::LoadAddrMask);
80
81    //load symbols
82    if (!console->loadGlobalSymbols(consoleSymtab))
83        panic("could not load console symbols\n");
84
85    if (!console->loadGlobalSymbols(debugSymbolTable))
86        panic("could not load console symbols\n");
87
88
89#ifndef NDEBUG
90    consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic");
91#endif
92
93    /**
94     * Copy the osflags (kernel arguments) into the consoles
95     * memory. (Presently Linux does not use the console service
96     * routine to get these command line arguments, but Tru64 and
97     * others do.)
98     */
99    if (consoleSymtab->findAddress("env_booted_osflags", addr)) {
100        warn("writing addr starting from %#x", addr);
101        cout << "-" << endl;
102        virtPort.writeBlob(addr, (uint8_t*)params()->boot_osflags.c_str(),
103                strlen(params()->boot_osflags.c_str()));
104    }
105
106    /**
107     * Set the hardware reset parameter block system type and revision
108     * information to Tsunami.
109     */
110    if (consoleSymtab->findAddress("m5_rpb", addr)) {
111        uint64_t data;
112        data = htog(params()->system_type);
113        virtPort.write(addr+0x50, data);
114        data = htog(params()->system_rev);
115        virtPort.write(addr+0x58, data);
116    } else
117        panic("could not find hwrpb\n");
118#endif
119}
120
121MipsSystem::~MipsSystem()
122{
123}
124#if FULL_SYSTEM
125/**
126 * This function fixes up addresses that are used to match PCs for
127 * hooking simulator events on to target function executions.
128 *
129 * Mips binaries may have multiple global offset table (GOT)
130 * sections.  A function that uses the GOT starts with a
131 * two-instruction prolog which sets the global pointer (gp == r29) to
132 * the appropriate GOT section.  The proper gp value is calculated
133 * based on the function address, which must be passed by the caller
134 * in the procedure value register (pv aka t12 == r27).  This sequence
135 * looks like the following:
136 *
137 *			opcode Ra Rb offset
138 *	ldah gp,X(pv)     09   29 27   X
139 *	lda  gp,Y(gp)     08   29 29   Y
140 *
141 * for some constant offsets X and Y.  The catch is that the linker
142 * (or maybe even the compiler, I'm not sure) may recognize that the
143 * caller and callee are using the same GOT section, making this
144 * prolog redundant, and modify the call target to skip these
145 * instructions.  If we check for execution of the first instruction
146 * of a function (the one the symbol points to) to detect when to skip
147 * it, we'll miss all these modified calls.  It might work to
148 * unconditionally check for the third instruction, but not all
149 * functions have this prolog, and there's some chance that those
150 * first two instructions could have undesired consequences.  So we do
151 * the Right Thing and pattern-match the first two instructions of the
152 * function to decide where to patch.
153 *
154 * Eventually this code should be moved into an ISA-specific file.
155 */
156
157Addr
158MipsSystem::fixFuncEventAddr(Addr addr)
159{
160  /*
161    // mask for just the opcode, Ra, and Rb fields (not the offset)
162    const uint32_t inst_mask = 0xffff0000;
163    // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
164    const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16);
165    // lda  gp,Y(gp): opcode 8, Ra = 29, rb = 29
166    const uint32_t gp_lda_pattern  = (8 << 26) | (29 << 21) | (29 << 16);
167
168    uint32_t i1 = virtPort.read<uint32_t>(addr);
169    uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MipsISA::MachInst));
170
171    if ((i1 & inst_mask) == gp_ldah_pattern &&
172        (i2 & inst_mask) == gp_lda_pattern) {
173        Addr new_addr = addr + 2* sizeof(MipsISA::MachInst);
174        DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr);
175        return new_addr;
176    } else {
177        return addr;
178        }*/
179  return addr;
180}
181
182
183void
184MipsSystem::setMipsAccess(Addr access)
185{
186    Addr addr = 0;
187    if (consoleSymtab->findAddress("m5MipsAccess", addr)) {
188      //        virtPort.write(addr, htog(EV5::Phys2K0Seg(access)));
189    } else
190    panic("could not find m5MipsAccess\n");
191    }
192
193#endif
194
195bool
196MipsSystem::breakpoint()
197{
198  return 0;
199  //    return remoteGDB[0]->trap(MIPS_KENTRY_INT);
200}
201
202void
203MipsSystem::serialize(std::ostream &os)
204{
205    System::serialize(os);
206    //    consoleSymtab->serialize("console_symtab", os);
207}
208
209
210void
211MipsSystem::unserialize(Checkpoint *cp, const std::string &section)
212{
213    System::unserialize(cp,section);
214    //    consoleSymtab->unserialize("console_symtab", cp, section);
215}
216
217MipsSystem *
218MipsSystemParams::create()
219{
220    return new MipsSystem(this);
221}
222
223