system.cc revision 5222:bb733a878f85
1/*
2 * Copyright N) 2007 MIPS Technologies, Inc.  All Rights Reserved
3 *
4 * This software is part of the M5 simulator.
5 *
6 * THIS IS A LEGAL AGREEMENT.  BY DOWNLOADING, USING, COPYING, CREATING
7 * DERIVATIVE WORKS, AND/OR DISTRIBUTING THIS SOFTWARE YOU ARE AGREEING
8 * TO THESE TERMS AND CONDITIONS.
9 *
10 * Permission is granted to use, copy, create derivative works and
11 * distribute this software and such derivative works for any purpose,
12 * so long as (1) the copyright notice above, this grant of permission,
13 * and the disclaimer below appear in all copies and derivative works
14 * made, (2) the copyright notice above is augmented as appropriate to
15 * reflect the addition of any new copyrightable work in a derivative
16 * work (e.g., Copyright N) <Publication Year> Copyright Owner), and (3)
17 * the name of MIPS Technologies, Inc. ($(B!H(BMIPS$(B!I(B) is not used in any
18 * advertising or publicity pertaining to the use or distribution of
19 * this software without specific, written prior authorization.
20 *
21 * THIS SOFTWARE IS PROVIDED $(B!H(BAS IS.$(B!I(B  MIPS MAKES NO WARRANTIES AND
22 * DISCLAIMS ALL WARRANTIES, WHETHER EXPRESS, STATUTORY, IMPLIED OR
23 * OTHERWISE, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
25 * NON-INFRINGEMENT OF THIRD PARTY RIGHTS, REGARDING THIS SOFTWARE.
26 * IN NO EVENT SHALL MIPS BE LIABLE FOR ANY DAMAGES, INCLUDING DIRECT,
27 * INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL, OR PUNITIVE DAMAGES OF
28 * ANY KIND OR NATURE, ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT,
29 * THIS SOFTWARE AND/OR THE USE OF THIS SOFTWARE, WHETHER SUCH LIABILITY
30 * IS ASSERTED ON THE BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE OR
31 * STRICT LIABILITY), OR OTHERWISE, EVEN IF MIPS HAS BEEN WARNED OF THE
32 * POSSIBILITY OF ANY SUCH LOSS OR DAMAGE IN ADVANCE.
33 *
34 *
35 * Authors: Ali G. Saidi
36 *          Nathan L. Binkert
37 *          Jaidev Patwardhan
38 */
39
40#include "arch/mips/system.hh"
41#include "arch/vtophys.hh"
42#include "base/remote_gdb.hh"
43#include "base/loader/object_file.hh"
44#include "base/loader/hex_file.hh"
45#include "base/loader/symtab.hh"
46#include "base/trace.hh"
47#include "mem/physical.hh"
48#include "params/MipsSystem.hh"
49#include "sim/byteswap.hh"
50
51
52using namespace LittleEndianGuest;
53
54MipsSystem::MipsSystem(Params *p)
55    : System(p)
56{
57
58#if FULL_SYSTEM
59    if (p->bare_iron == true) {
60        hexFile = new HexFile(params()->hex_file_name);
61        if(!hexFile->loadSections(&functionalPort,MipsISA::LoadAddrMask))
62            panic("Could not load hex file\n");
63    }
64
65    Addr addr = 0;
66    /* Comment out old Alpha Based Code
67
68     Don't need the console before we start looking at booting linux */
69
70
71    consoleSymtab = new SymbolTable;
72
73
74    /**
75     * Load the console code into memory
76     */
77    //    Load Console Code
78    console = createObjectFile(params()->console);
79
80    warn("console code is located at: %s\n", params()->console);
81
82    if (console == NULL)
83        fatal("Could not load console file %s", params()->console);
84    //Load program sections into memory
85     console->loadSections(&functionalPort, MipsISA::LoadAddrMask);
86
87    //load symbols
88    if (!console->loadGlobalSymbols(consoleSymtab))
89        panic("could not load console symbols\n");
90
91    if (!console->loadGlobalSymbols(debugSymbolTable))
92        panic("could not load console symbols\n");
93
94
95#ifndef NDEBUG
96    consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic");
97#endif
98
99    /**
100     * Copy the osflags (kernel arguments) into the consoles
101     * memory. (Presently Linux does not use the console service
102     * routine to get these command line arguments, but Tru64 and
103     * others do.)
104     */
105    if (consoleSymtab->findAddress("env_booted_osflags", addr)) {
106        warn("writing addr starting from %#x", addr);
107        cout << "-" << endl;
108        virtPort.writeBlob(addr, (uint8_t*)params()->boot_osflags.c_str(),
109                strlen(params()->boot_osflags.c_str()));
110    }
111
112    /**
113     * Set the hardware reset parameter block system type and revision
114     * information to Tsunami.
115     */
116    if (consoleSymtab->findAddress("m5_rpb", addr)) {
117        uint64_t data;
118        data = htog(params()->system_type);
119        virtPort.write(addr+0x50, data);
120        data = htog(params()->system_rev);
121        virtPort.write(addr+0x58, data);
122    } else
123        panic("could not find hwrpb\n");
124#endif
125}
126
127MipsSystem::~MipsSystem()
128{
129}
130#if FULL_SYSTEM
131/**
132 * This function fixes up addresses that are used to match PCs for
133 * hooking simulator events on to target function executions.
134 *
135 * Mips binaries may have multiple global offset table (GOT)
136 * sections.  A function that uses the GOT starts with a
137 * two-instruction prolog which sets the global pointer (gp == r29) to
138 * the appropriate GOT section.  The proper gp value is calculated
139 * based on the function address, which must be passed by the caller
140 * in the procedure value register (pv aka t12 == r27).  This sequence
141 * looks like the following:
142 *
143 *			opcode Ra Rb offset
144 *	ldah gp,X(pv)     09   29 27   X
145 *	lda  gp,Y(gp)     08   29 29   Y
146 *
147 * for some constant offsets X and Y.  The catch is that the linker
148 * (or maybe even the compiler, I'm not sure) may recognize that the
149 * caller and callee are using the same GOT section, making this
150 * prolog redundant, and modify the call target to skip these
151 * instructions.  If we check for execution of the first instruction
152 * of a function (the one the symbol points to) to detect when to skip
153 * it, we'll miss all these modified calls.  It might work to
154 * unconditionally check for the third instruction, but not all
155 * functions have this prolog, and there's some chance that those
156 * first two instructions could have undesired consequences.  So we do
157 * the Right Thing and pattern-match the first two instructions of the
158 * function to decide where to patch.
159 *
160 * Eventually this code should be moved into an ISA-specific file.
161 */
162
163Addr
164MipsSystem::fixFuncEventAddr(Addr addr)
165{
166  /*
167    // mask for just the opcode, Ra, and Rb fields (not the offset)
168    const uint32_t inst_mask = 0xffff0000;
169    // ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
170    const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16);
171    // lda  gp,Y(gp): opcode 8, Ra = 29, rb = 29
172    const uint32_t gp_lda_pattern  = (8 << 26) | (29 << 21) | (29 << 16);
173
174    uint32_t i1 = virtPort.read<uint32_t>(addr);
175    uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MipsISA::MachInst));
176
177    if ((i1 & inst_mask) == gp_ldah_pattern &&
178        (i2 & inst_mask) == gp_lda_pattern) {
179        Addr new_addr = addr + 2* sizeof(MipsISA::MachInst);
180        DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr);
181        return new_addr;
182    } else {
183        return addr;
184        }*/
185  return addr;
186}
187
188
189void
190MipsSystem::setMipsAccess(Addr access)
191{
192    Addr addr = 0;
193    if (consoleSymtab->findAddress("m5MipsAccess", addr)) {
194      //        virtPort.write(addr, htog(EV5::Phys2K0Seg(access)));
195    } else
196    panic("could not find m5MipsAccess\n");
197    }
198
199#endif
200
201bool
202MipsSystem::breakpoint()
203{
204  return 0;
205  //    return remoteGDB[0]->trap(MIPS_KENTRY_INT);
206}
207
208void
209MipsSystem::serialize(std::ostream &os)
210{
211    System::serialize(os);
212    //    consoleSymtab->serialize("console_symtab", os);
213}
214
215
216void
217MipsSystem::unserialize(Checkpoint *cp, const std::string &section)
218{
219    System::unserialize(cp,section);
220    //    consoleSymtab->unserialize("console_symtab", cp, section);
221}
222
223MipsSystem *
224MipsSystemParams::create()
225{
226    return new MipsSystem(this);
227}
228
229