For Q2, program binary is loaded by function createObjectFile() [src/base/loader/object_file.cc] firstly, then binary image is copied to AbstractMemory, see call stack blow:
#0 0x0000003e1e289904 in memcpy () from /lib64/libc.so.6
#1 0x00000000008c942a in AbstractMemory::functionalAccess (this=0x255ae70,
pkt=0x7fffffffc7e0)
at build/MIPS/mem/abstract_mem.cc:438
#2 0x00000000008d1069 in SimpleMemory::doFunctionalAccess (this=0x255ae70,
pkt=0x7fffffffc7e0) at build/MIPS/mem/simple_mem.cc:96
#3 0x00000000008d178e in SimpleMemory::MemoryPort::recvFunctional
(this=0x1b48560, pkt=0x7fffffffc7e0)
at build/MIPS/mem/simple_mem.cc:157
#4 0x00000000008b50f9 in MasterPort::sendFunctional (this=0x2175ed0,
pkt=0x7fffffffc7e0) at build/MIPS/mem/port.cc:118
#5 0x000000000089c763 in CoherentBus::recvFunctional (this=0x2613500,
pkt=0x7fffffffc7e0, slave_port_id=0)
at build/MIPS/mem/coherent_bus.cc:450
#6 0x000000000089d0d0 in CoherentBus::CoherentBusSlavePort::recvFunctional
(this=0x2179960, pkt=0x7fffffffc7e0)
at build/MIPS/mem/coherent_bus.hh:116
#7 0x00000000008b50f9 in MasterPort::sendFunctional (this=0x26126f8,
pkt=0x7fffffffc7e0) at build/MIPS/mem/port.cc:118
#8 0x00000000008b85b1 in PortProxy::blobHelper (this=0x2623e48, addr=0,
p=0x7fffd0020000 "\177ELF\001\001\001", size=8192, cmd=...)
at build/MIPS/mem/port_proxy.cc:53
#9 0x00000000007b260f in PortProxy::writeBlob (this=0x2623e48, addr=0,
p=0x7fffd0020000 "\177ELF\001\001\001", size=8192)
at build/MIPS/mem/port_proxy.hh:107
#10 0x00000000008b9932 in SETranslatingPortProxy::tryWriteBlob (this=0x2623e48,
addr=4194304,
p=0x7fffd0020000 "\177ELF\001\001\001", size=580082) at
build/MIPS/mem/se_translating_port_proxy.cc:114
#11 0x00000000008b99d3 in SETranslatingPortProxy::writeBlob (this=0x2623e48,
addr=4194304, p=0x7fffd0020000 "\177ELF\001\001\001",
size=580082) at build/MIPS/mem/se_translating_port_proxy.cc:125
#12 0x000000000067ab01 in ObjectFile::loadSection (this=0x25cf950,
sec=0x25cf990, memProxy=..., addrMask=18446744073709551615)
at build/MIPS/base/loader/object_file.cc:73
#13 0x000000000067ab74 in ObjectFile::loadSections (this=0x25cf950,
memProxy=..., addrMask=18446744073709551615)
at build/MIPS/base/loader/object_file.cc:89
#14 0x0000000000676c2a in ElfObject::loadSections (this=0x25cf950,
memProxy=..., addrMask=18446744073709551615)
at build/MIPS/base/loader/elf_object.cc:419
#15 0x00000000004441d7 in MipsLiveProcess::argsInit<unsigned int>
(this=0x2623d80, pageSize=8192)
at build/MIPS/arch/mips/process.cc:82
#16 0x0000000000443dd5 in MipsLiveProcess::initState (this=0x2623d80) at
build/MIPS/arch/mips/process.cc:72
Fetch/read/write are handled by function AbstractMemory::access(PacketPtr pkt).
I don't understand Q1.
----
' Huang He (Henry)
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-----Original Message-----
From: gem5-users-boun...@gem5.org [mailto:gem5-users-boun...@gem5.org] On
Behalf Of Zheng Wu
Sent: Wednesday, July 10, 2013 8:04 AM
To: gem5 users mailing list
Subject: [gem5-users] CPU Instruction Execution
Hi All,
I am trying to understand the source code. I want to know where in the code
does the CPUs execute instructions.
I am currently looking at:
- src/cpu/base.hh
- src/cpu/thread_context.hh
- src/cpu/cpuevent.hh
Q1: Shouldn't there be some kind of queue for instructions or some program
counter somewhere?
Q2: where is the code that reads the program binary and pass the instruction to
the cpu?
Any comments are much appreciated!!
Best Regards,
Zheng Wu
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