228 lines
7.4 KiB
C++
Executable file
228 lines
7.4 KiB
C++
Executable file
/*
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* Copyright N) 2007 MIPS Technologies, Inc. All Rights Reserved
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*
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* This software is part of the M5 simulator.
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*
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* THIS IS A LEGAL AGREEMENT. BY DOWNLOADING, USING, COPYING, CREATING
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* DERIVATIVE WORKS, AND/OR DISTRIBUTING THIS SOFTWARE YOU ARE AGREEING
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* TO THESE TERMS AND CONDITIONS.
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*
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* Permission is granted to use, copy, create derivative works and
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* distribute this software and such derivative works for any purpose,
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* so long as (1) the copyright notice above, this grant of permission,
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* and the disclaimer below appear in all copies and derivative works
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* made, (2) the copyright notice above is augmented as appropriate to
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* reflect the addition of any new copyrightable work in a derivative
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* work (e.g., Copyright N) <Publication Year> Copyright Owner), and (3)
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* the name of MIPS Technologies, Inc. ($(B!H(BMIPS$(B!I(B) is not used in any
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* advertising or publicity pertaining to the use or distribution of
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* this software without specific, written prior authorization.
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*
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* THIS SOFTWARE IS PROVIDED $(B!H(BAS IS.$(B!I(B MIPS MAKES NO WARRANTIES AND
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* DISCLAIMS ALL WARRANTIES, WHETHER EXPRESS, STATUTORY, IMPLIED OR
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* OTHERWISE, INCLUDING BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND
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* NON-INFRINGEMENT OF THIRD PARTY RIGHTS, REGARDING THIS SOFTWARE.
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* IN NO EVENT SHALL MIPS BE LIABLE FOR ANY DAMAGES, INCLUDING DIRECT,
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* INDIRECT, INCIDENTAL, CONSEQUENTIAL, SPECIAL, OR PUNITIVE DAMAGES OF
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* ANY KIND OR NATURE, ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT,
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* THIS SOFTWARE AND/OR THE USE OF THIS SOFTWARE, WHETHER SUCH LIABILITY
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* IS ASSERTED ON THE BASIS OF CONTRACT, TORT (INCLUDING NEGLIGENCE OR
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* STRICT LIABILITY), OR OTHERWISE, EVEN IF MIPS HAS BEEN WARNED OF THE
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* POSSIBILITY OF ANY SUCH LOSS OR DAMAGE IN ADVANCE.
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*
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*
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* Authors: Ali G. Saidi
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* Nathan L. Binkert
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* Jaidev Patwardhan
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*/
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#include "arch/mips/system.hh"
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#include "arch/vtophys.hh"
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#include "base/remote_gdb.hh"
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#include "base/loader/object_file.hh"
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#include "base/loader/hex_file.hh"
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#include "base/loader/symtab.hh"
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#include "base/trace.hh"
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#include "mem/physical.hh"
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#include "params/MipsSystem.hh"
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#include "sim/byteswap.hh"
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using namespace LittleEndianGuest;
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MipsSystem::MipsSystem(Params *p)
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: System(p)
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{
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#if FULL_SYSTEM
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if (p->bare_iron == true) {
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hexFile = new HexFile(params()->hex_file_name);
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if(!hexFile->loadSections(&functionalPort,MipsISA::LoadAddrMask))
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panic("Could not load hex file\n");
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}
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Addr addr = 0;
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/* Comment out old Alpha Based Code
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Don't need the console before we start looking at booting linux */
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consoleSymtab = new SymbolTable;
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/**
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* Load the console code into memory
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*/
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// Load Console Code
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console = createObjectFile(params()->console);
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warn("console code is located at: %s\n", params()->console);
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if (console == NULL)
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fatal("Could not load console file %s", params()->console);
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//Load program sections into memory
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console->loadSections(&functionalPort, MipsISA::LoadAddrMask);
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//load symbols
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if (!console->loadGlobalSymbols(consoleSymtab))
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panic("could not load console symbols\n");
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if (!console->loadGlobalSymbols(debugSymbolTable))
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panic("could not load console symbols\n");
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#ifndef NDEBUG
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consolePanicEvent = addConsoleFuncEvent<BreakPCEvent>("panic");
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#endif
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/**
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* Copy the osflags (kernel arguments) into the consoles
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* memory. (Presently Linux does not use the console service
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* routine to get these command line arguments, but Tru64 and
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* others do.)
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*/
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if (consoleSymtab->findAddress("env_booted_osflags", addr)) {
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warn("writing addr starting from %#x", addr);
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cout << "-" << endl;
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virtPort.writeBlob(addr, (uint8_t*)params()->boot_osflags.c_str(),
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strlen(params()->boot_osflags.c_str()));
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}
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/**
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* Set the hardware reset parameter block system type and revision
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* information to Tsunami.
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*/
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if (consoleSymtab->findAddress("m5_rpb", addr)) {
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uint64_t data;
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data = htog(params()->system_type);
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virtPort.write(addr+0x50, data);
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data = htog(params()->system_rev);
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virtPort.write(addr+0x58, data);
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} else
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panic("could not find hwrpb\n");
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#endif
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}
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MipsSystem::~MipsSystem()
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{
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}
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#if FULL_SYSTEM
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/**
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* This function fixes up addresses that are used to match PCs for
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* hooking simulator events on to target function executions.
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*
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* Mips binaries may have multiple global offset table (GOT)
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* sections. A function that uses the GOT starts with a
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* two-instruction prolog which sets the global pointer (gp == r29) to
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* the appropriate GOT section. The proper gp value is calculated
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* based on the function address, which must be passed by the caller
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* in the procedure value register (pv aka t12 == r27). This sequence
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* looks like the following:
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*
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* opcode Ra Rb offset
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* ldah gp,X(pv) 09 29 27 X
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* lda gp,Y(gp) 08 29 29 Y
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*
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* for some constant offsets X and Y. The catch is that the linker
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* (or maybe even the compiler, I'm not sure) may recognize that the
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* caller and callee are using the same GOT section, making this
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* prolog redundant, and modify the call target to skip these
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* instructions. If we check for execution of the first instruction
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* of a function (the one the symbol points to) to detect when to skip
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* it, we'll miss all these modified calls. It might work to
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* unconditionally check for the third instruction, but not all
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* functions have this prolog, and there's some chance that those
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* first two instructions could have undesired consequences. So we do
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* the Right Thing and pattern-match the first two instructions of the
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* function to decide where to patch.
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*
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* Eventually this code should be moved into an ISA-specific file.
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*/
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Addr
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MipsSystem::fixFuncEventAddr(Addr addr)
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{
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/*
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// mask for just the opcode, Ra, and Rb fields (not the offset)
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const uint32_t inst_mask = 0xffff0000;
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// ldah gp,X(pv): opcode 9, Ra = 29, Rb = 27
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const uint32_t gp_ldah_pattern = (9 << 26) | (29 << 21) | (27 << 16);
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// lda gp,Y(gp): opcode 8, Ra = 29, rb = 29
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const uint32_t gp_lda_pattern = (8 << 26) | (29 << 21) | (29 << 16);
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uint32_t i1 = virtPort.read<uint32_t>(addr);
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uint32_t i2 = virtPort.read<uint32_t>(addr + sizeof(MipsISA::MachInst));
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if ((i1 & inst_mask) == gp_ldah_pattern &&
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(i2 & inst_mask) == gp_lda_pattern) {
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Addr new_addr = addr + 2* sizeof(MipsISA::MachInst);
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DPRINTF(Loader, "fixFuncEventAddr: %p -> %p", addr, new_addr);
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return new_addr;
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} else {
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return addr;
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}*/
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return addr;
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}
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void
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MipsSystem::setMipsAccess(Addr access)
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{
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Addr addr = 0;
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if (consoleSymtab->findAddress("m5MipsAccess", addr)) {
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// virtPort.write(addr, htog(EV5::Phys2K0Seg(access)));
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} else
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panic("could not find m5MipsAccess\n");
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}
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#endif
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bool
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MipsSystem::breakpoint()
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{
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return 0;
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// return remoteGDB[0]->trap(MIPS_KENTRY_INT);
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}
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void
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MipsSystem::serialize(std::ostream &os)
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{
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System::serialize(os);
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// consoleSymtab->serialize("console_symtab", os);
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}
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void
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MipsSystem::unserialize(Checkpoint *cp, const std::string §ion)
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{
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System::unserialize(cp,section);
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// consoleSymtab->unserialize("console_symtab", cp, section);
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}
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MipsSystem *
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MipsSystemParams::create()
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{
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return new MipsSystem(this);
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}
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