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/*
* Copyright (c) 2007 MIPS Technologies, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Ali Saidi
* Nathan Binkert
* Jaidev Patwardhan
*/
#include "arch/mips/system.hh"
#include "arch/vtophys.hh"
#include "base/remote_gdb.hh"
#include "base/loader/object_file.hh"
#include "base/loader/hex_file.hh"
#include "base/loader/symtab.hh"
#include "base/trace.hh"
#include "mem/physical.hh"
#include "params/MipsSystem.hh"
#include "sim/byteswap.hh"
using namespace LittleEndianGuest;
MipsSystem::MipsSystem(Params *p)
: System(p)
{
#if FULL_SYSTEM
if (p->bare_iron == true) {
hexFile = new HexFile(params()->hex_file_name);
if(!hexFile->loadSections(&functionalPort,MipsISA::LoadAddrMask))
panic("Could not load hex file\n");
}
Addr addr = 0;
/* Comment out old Alpha Based Code
Don't need the console before we start looking at booting linux */
consoleSymtab = new SymbolTable;
/**
* Load the console code into memory
*/
// Load Console Code
console = createObjectFile(params()->console);
warn("console code is located at: %s\n", params()->console);
if (console == NULL)
fatal("Could not load console file %s", params()->console);
//Load program sections into memory
console->loadSections(&functionalPort, MipsISA::LoadAddrMask);
//load symbols
if (!console->loadGlobalSymbols(consoleSymtab))
panic("could not load console symbols\n");
if (!console->loadGlobalSymbols(debugSymbolTable))
panic("could not load console symbols\n");
#ifndef NDEBUG
consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic");
#endif
/**
* Copy the osflags (kernel arguments) into the consoles
* memory. (Presently Linux does not use the console service
* routine to get these command line arguments, but Tru64 and
* others do.)
*/
if (consoleSymtab->findAddress("env_booted_osflags", addr)) {
warn("writing addr starting from %#x", addr);
cout << "-" << endl;
virtPort.writeBlob(addr, (uint8_t*)params()->boot_osflags.c_str(),
strlen(params()->boot_osflags.c_str()));
}
/**
* Set the hardware reset parameter block system type and revision
* information to Tsunami.
*/
if (consoleSymtab->findAddress("m5_rpb", addr)) {
uint64_t data;
data = htog(params()->system_type);
virtPort.write(addr+0x50, data);
data = htog(params()->system_rev);
virtPort.write(addr+0x58, data);
} else
panic("could not find hwrpb\n");
#endif
}
MipsSystem::~MipsSystem()
{
}
#if FULL_SYSTEM
/**
* This function fixes up addresses that are used to match PCs for
* hooking simulator events on to target function executions.
*
* Mips binaries may have multiple global offset table (GOT)
* sections. A function that uses the GOT starts with a
* two-instruction prolog which sets the global pointer (gp == r29) to
* the appropriate GOT section. The proper gp value is calculated
* based on the function address, which must be passed by the caller
* in the procedure value register (pv aka t12 == r27). This sequence
* looks like the following:
*
* opcode Ra Rb offset
* ldah gp,X(pv) 09 29 27 X
* lda gp,Y(gp) 08 29 29 Y
*
* for some constant offsets X and Y. The catch is that the linker
* (or maybe even the compiler, I'm not sure) may recognize that the
* caller and callee are using the same GOT section, making this
* prolog redundant, and modify the call target to skip these
* instructions. If we check for execution of the first instruction
* of a function (the one the symbol points to) to detect when to skip
* it, we'll miss all these modified calls. It might work to
* unconditionally check for the third instruction, but not all
* functions have this prolog, and there's some chance that those
* first two instructions could have undesired consequences. So we do
* the Right Thing and pattern-match the first two instructions of the
* function to decide where to patch.
*
* Eventually this code should be moved into an ISA-specific file.
*/
Addr
MipsSystem::fixFuncEventAddr(Addr addr)
{
/*
// mask for just the opcode, Ra, and Rb fields (not the offset)
const uint32_t inst_mask = 0xffff0000;
// ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16);
// lda gp,Y(gp): opcode 8, Ra = 29, rb = 29
const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16);
uint32_t i1 = virtPort.read<uint32_t>(addr);
uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MipsISA::MachInst));
if ((i1 & inst_mask) == gp_ldah_pattern &&
(i2 & inst_mask) == gp_lda_pattern) {
Addr new_addr = addr + 2* sizeof(MipsISA::MachInst);
DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr);
return new_addr;
} else {
return addr;
}*/
return addr;
}
void
MipsSystem::setMipsAccess(Addr access)
{
Addr addr = 0;
if (consoleSymtab->findAddress("m5MipsAccess", addr)) {
// virtPort.write(addr, htog(EV5::Phys2K0Seg(access)));
} else
panic("could not find m5MipsAccess\n");
}
#endif
bool
MipsSystem::breakpoint()
{
return 0;
// return remoteGDB[0]->trap(MIPS_KENTRY_INT);
}
void
MipsSystem::serialize(std::ostream &os)
{
System::serialize(os);
// consoleSymtab->serialize("console_symtab", os);
}
void
MipsSystem::unserialize(Checkpoint *cp, const std::string §ion)
{
System::unserialize(cp,section);
// consoleSymtab->unserialize("console_symtab", cp, section);
}
MipsSystem *
MipsSystemParams::create()
{
return new MipsSystem(this);
}
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