2 * Copyright (c) 2002-2005 The Regents of The University of Michigan
3 * Copyright (c) 2007 MIPS Technologies, Inc.
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.
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.
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"
46 using namespace LittleEndianGuest
;
48 MipsSystem::MipsSystem(Params
*p
)
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");
60 /* Comment out old Alpha Based Code
62 Don't need the console before we start looking at booting linux */
65 consoleSymtab
= new SymbolTable
;
69 * Load the console code into memory
72 console
= createObjectFile(params()->console
);
74 warn("console code is located at: %s\n", params()->console
);
77 fatal("Could not load console file %s", params()->console
);
78 //Load program sections into memory
79 console
->loadSections(&functionalPort
, MipsISA::LoadAddrMask
);
82 if (!console
->loadGlobalSymbols(consoleSymtab
))
83 panic("could not load console symbols\n");
85 if (!console
->loadGlobalSymbols(debugSymbolTable
))
86 panic("could not load console symbols\n");
90 consolePanicEvent
= addConsoleFuncEvent
<BreakPCEvent
>("panic");
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
99 if (consoleSymtab
->findAddress("env_booted_osflags", addr
)) {
100 warn("writing addr starting from %#x", addr
);
102 virtPort
.writeBlob(addr
, (uint8_t*)params()->boot_osflags
.c_str(),
103 strlen(params()->boot_osflags
.c_str()));
107 * Set the hardware reset parameter block system type and revision
108 * information to Tsunami.
110 if (consoleSymtab
->findAddress("m5_rpb", addr
)) {
112 data
= htog(params()->system_type
);
113 virtPort
.write(addr
+0x50, data
);
114 data
= htog(params()->system_rev
);
115 virtPort
.write(addr
+0x58, data
);
117 panic("could not find hwrpb\n");
121 MipsSystem::~MipsSystem()
126 * This function fixes up addresses that are used to match PCs for
127 * hooking simulator events on to target function executions.
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:
137 * opcode Ra Rb offset
138 * ldah gp,X(pv) 09 29 27 X
139 * lda gp,Y(gp) 08 29 29 Y
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.
154 * Eventually this code should be moved into an ISA-specific file.
158 MipsSystem::fixFuncEventAddr(Addr addr
)
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);
168 uint32_t i1 = virtPort.read<uint32_t>(addr);
169 uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MipsISA::MachInst));
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);
184 MipsSystem::setMipsAccess(Addr access
)
187 if (consoleSymtab
->findAddress("m5MipsAccess", addr
)) {
188 // virtPort.write(addr, htog(AlphaISA::Phys2K0Seg(access)));
190 panic("could not find m5MipsAccess\n");
196 MipsSystem::breakpoint()
199 // return remoteGDB[0]->trap(MIPS_KENTRY_INT);
203 MipsSystem::serialize(std::ostream
&os
)
205 System::serialize(os
);
206 // consoleSymtab->serialize("console_symtab", os);
211 MipsSystem::unserialize(Checkpoint
*cp
, const std::string
§ion
)
213 System::unserialize(cp
,section
);
214 // consoleSymtab->unserialize("console_symtab", cp, section);
218 MipsSystemParams::create()
220 return new MipsSystem(this);