<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hi,<div><br></div><div>I am trying to optimize some benchmarks using LLVM and run them on gem5 simulator (build for ARM). I am using Sourcery Codebench cross-compiler for ARM on my x-86 machine.</div><div>My steps up till now have been using the following commands.</div><div><br></div><div><b id="internal-source-marker_0.6401777998544276" style="color: rgb(0, 0, 0); font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-weight: normal; "><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; ">1. clang -static -emit-llvm -march=armv7-a -mfloat-abi=soft -target arm-elf a.cpp -c -integrated-as \ </span></b></div><div><b style="color: rgb(0, 0, 0); font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-weight: normal; "><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; "> --sysroot=/home/silky/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/arm-none-linux-gnueabi/libc \</span></b></div><div><b style="color: rgb(0, 0, 0); font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-weight: normal; "><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; "> -I/home/silky/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/arm-none-linux-gnueabi/include/c++/4.7.2/ \</span></b></div><div><b style="color: rgb(0, 0, 0); font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-weight: normal; "><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; ">-I/home/silky/CodeSourcery/Sourcery_CodeBench_Lite_for_ARM_GNU_Linux/arm-none-linux-gnueabi/include/c++/4.7.2/arm-none-linux-gnueabi/armv4t/ -o a.bc</span><br><span style="color: rgb(0, 0, 0); font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; background-color: transparent; "></span><br><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; ">2. llc -O3 -o a.s -march=arm a.bc</span><br><span style="color: rgb(0, 0, 0); font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; background-color: transparent; "></span><br><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; ">3. arm-none-linux-gnueabi-g++ -static a.s -o a_st</span></b></div><div><b id="internal-source-marker_0.6401777998544276" style="color: rgb(0, 0, 0); font-style: normal; font-variant: normal; letter-spacing: normal; line-height: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-weight: normal; "><span style="color: rgb(0, 0, 0); background-color: transparent; font-weight: normal; font-style: normal; font-variant: normal; text-decoration: none; vertical-align: baseline; white-space: pre-wrap; "><br></span></b></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">To run the final executable on gem5, I use</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;"><br></span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">4. /gem5$ build/ARM/gem5.debug configs/example/se.py -c /home/silky/mbench/vect/a_st</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;"><br></span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">This results in a page fault -</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;"><br></span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">Global frequency set at 1000000000000 ticks per second
0: system.remote_gdb.listener: listening for remote gdb #0 on port 7000
**** REAL SIMULATION ****
info: Entering event queue @ 0. Starting simulation...
panic: Page table fault when accessing virtual address 0xfffffff4
@ cycle 2509500
[invoke:build/ARM/sim/faults.cc, line 70]</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap; "><br></span></div><div><span class="Apple-style-span" style="white-space: pre-wrap; ">Trace :</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap; ">9405000: system.cpu T0 : 0x8118 : bl : IntAlu : D=0x000000000000811c
gem5.debug: build/ARM/mem/request.hh:514: Addr Request::getPC() const: Assertion `privateFlags.isSet(VALID_PC)' failed.</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap; "><br></span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">Most of the search results talk about the executable not being statically compiled. Could anyone please tell me if any of the compilation commands is incorrect.</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">Is there any other way I can check the executable generated is not buggy?</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;"><br></span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">Thanks and Regards,</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap;">Silky</span></div><div><span class="Apple-style-span" style="white-space: pre-wrap; "><br></span></div></body></html>