


php editor Apple is here to introduce to you a method of modifying the Go language to use Gem5 m5ops. Gem5 is a widely used emulator, and m5ops is a set of operating system interfaces in Gem5. By modifying the Go language, we can use Gem5's m5ops interface for performance analysis and debugging. The specific steps are to add support for m5ops to the Go tool chain, and then use the functions provided by m5ops for performance monitoring and debugging operations. In this way, we can better understand how the Go language is running in the simulation environment and perform corresponding optimization and debugging work.
Question content
I am still new to golang.
I'm trying to insert some c function calls (specifically m5ops) into golang's runtime (specifically src/proc.go).
I tried using cgo, which resulted in adding this import to the beginning of proc.go
:
// #cgo cflags: -i$(gem5_path)/include -static // #cgo ldflags: -l$(gem5_path)/util/m5/build/x86/out -lm5 // #include <gem5/m5ops.h> import "c"
But when I try to rebuild using ./all.bash
the script outputs and then exits:
./all.bash building go cmd/dist using /usr/local/go. (go1.20.5 linux/amd64) building go toolchain1 using /usr/local/go. building go bootstrap cmd/go (go_bootstrap) using go toolchain1. go tool dist: /home/landerx/goroot/src/runtime/proc.go imports c
A more detailed version of the above output:
./all.bash -v Building Go cmd/dist using /usr/local/go. (go1.20.5 linux/amd64) cmd/dist Building Go toolchain1 using /usr/local/go. internal/goarch internal/coverage/rtcov internal/goos internal/race internal/unsafeheader internal/goexperiment unicode runtime/internal/syscall sync/atomic runtime/internal/atomic internal/cpu unicode/utf8 internal/itoa math/bits internal/abi runtime/internal/math runtime/internal/sys bootstrap/internal/goarch bootstrap/internal/goexperiment bootstrap/math/bits encoding bootstrap/internal/unsafeheader bootstrap/internal/platform bootstrap/internal/coverage internal/bytealg bootstrap/internal/abi math unicode/utf16 bootstrap/internal/goversion internal/goversion bootstrap/internal/race bootstrap/cmd/compile/internal/test runtime internal/reflectlite runtime/metrics sync internal/testlog internal/godebug bootstrap/internal/bisect math/rand errors sort bootstrap/sort io internal/oserror internal/safefilepath path strconv bootstrap/strconv syscall bootstrap/container/heap hash text/tabwriter bytes strings hash/adler32 hash/fnv hash/crc32 crypto reflect bootstrap/internal/types/errors go/build/constraint bootstrap/go/build/constraint bufio regexp/syntax html internal/syscall/execenv internal/syscall/unix time regexp context io/fs internal/poll internal/fmtsort bootstrap/internal/saferio encoding/binary os bootstrap/cmd/internal/notsha256 encoding/base64 bootstrap/cmd/internal/sys crypto/md5 bootstrap/internal/lazyregexp internal/lazyregexp path/filepath fmt os/exec log bootstrap/internal/buildcfg flag bootstrap/cmd/internal/src text/scanner bootstrap/cmd/internal/edit bootstrap/cmd/internal/pkgpath go/token bootstrap/compress/flate bootstrap/internal/zstd go/doc/comment bootstrap/debug/dwarf encoding/json runtime/debug bootstrap/math/big bootstrap/cmd/internal/bio net/url go/scanner bootstrap/cmd/internal/objabi bootstrap/cmd/compile/internal/abt bootstrap/cmd/internal/goobj bootstrap/cmd/internal/gcprog bootstrap/cmd/internal/quoted bootstrap/compress/zlib encoding/hex compress/flate go/ast internal/buildcfg internal/goroot bootstrap/cmd/internal/dwarf runtime/trace bootstrap/cmd/internal/archive bootstrap/cmd/internal/obj bootstrap/debug/macho bootstrap/debug/elf bootstrap/debug/pe bootstrap/internal/xcoff bootstrap/cmd/link/internal/dwtest compress/gzip bootstrap/internal/profile runtime/pprof go/doc go/printer go/internal/typeparams go/parser bootstrap/cmd/internal/codesign bootstrap/go/constant bootstrap/internal/pkgbits bootstrap/cmd/compile/internal/syntax bootstrap/cmd/link/internal/benchmark bootstrap/cmd/compile/internal/pgo/internal/graph go/build go/format bootstrap/cmd/cgo bootstrap/cmd/internal/obj/loong64 bootstrap/cmd/internal/obj/mips bootstrap/cmd/internal/obj/wasm bootstrap/cmd/internal/obj/arm bootstrap/cmd/internal/obj/arm64 bootstrap/cmd/internal/obj/s390x bootstrap/cmd/internal/obj/riscv bootstrap/cmd/internal/obj/ppc64 bootstrap/cmd/internal/obj/x86 bootstrap/cmd/asm/internal/flags bootstrap/cmd/compile/internal/base bootstrap/cmd/compile/internal/logopt bootstrap/cmd/asm/internal/lex bootstrap/cmd/link/internal/sym bootstrap/cmd/link/internal/loader bootstrap/cmd/compile/internal/bitvec bootstrap/cmd/compile/internal/types bootstrap/cmd/compile/internal/types2 bootstrap/cmd/link/internal/loadelf bootstrap/cmd/link/internal/loadmacho bootstrap/cmd/link/internal/loadpe bootstrap/cmd/link/internal/loadxcoff bootstrap/cmd/compile/internal/typebits bootstrap/cmd/compile/internal/ir bootstrap/cmd/asm/internal/arch bootstrap/cmd/link/internal/ld bootstrap/cmd/asm/internal/asm bootstrap/cmd/asm bootstrap/cmd/compile/internal/abi bootstrap/cmd/compile/internal/deadcode bootstrap/cmd/compile/internal/typecheck bootstrap/cmd/compile/internal/objw bootstrap/cmd/compile/internal/staticdata bootstrap/cmd/compile/internal/compare bootstrap/cmd/compile/internal/pgo bootstrap/cmd/compile/internal/coverage bootstrap/cmd/compile/internal/loopvar bootstrap/cmd/compile/internal/importer bootstrap/cmd/compile/internal/escape bootstrap/cmd/compile/internal/inline bootstrap/cmd/compile/internal/reflectdata bootstrap/cmd/compile/internal/devirtualize bootstrap/cmd/compile/internal/staticinit bootstrap/cmd/compile/internal/ssa bootstrap/cmd/link/internal/amd64 bootstrap/cmd/link/internal/loong64 bootstrap/cmd/link/internal/arm bootstrap/cmd/link/internal/mips bootstrap/cmd/link/internal/mips64 bootstrap/cmd/link/internal/arm64 bootstrap/cmd/link/internal/ppc64 bootstrap/cmd/link/internal/riscv64 bootstrap/cmd/link/internal/s390x bootstrap/cmd/link/internal/wasm bootstrap/cmd/link/internal/x86 bootstrap/cmd/link bootstrap/cmd/compile/internal/liveness bootstrap/cmd/compile/internal/ssagen bootstrap/cmd/compile/internal/amd64 bootstrap/cmd/compile/internal/arm bootstrap/cmd/compile/internal/arm64 bootstrap/cmd/compile/internal/dwarfgen bootstrap/cmd/compile/internal/loong64 bootstrap/cmd/compile/internal/mips bootstrap/cmd/compile/internal/mips64 bootstrap/cmd/compile/internal/wasm bootstrap/cmd/compile/internal/s390x bootstrap/cmd/compile/internal/riscv64 bootstrap/cmd/compile/internal/ppc64 bootstrap/cmd/compile/internal/walk bootstrap/cmd/compile/internal/x86 bootstrap/cmd/compile/internal/noder bootstrap/cmd/compile/internal/pkginit bootstrap/cmd/compile/internal/gc bootstrap/cmd/compile Building Go bootstrap cmd/go (go_bootstrap) using Go toolchain1. runtime go tool dist: /home/landerx/goroot/src/runtime/proc.go imports C
Tried the cgo_enabled=1
flag, doesn't seem to make any difference.
Tried just running make.bash
, it didn't seem to make any difference.
I was wondering if it was a dependency issue, but I didn't see any messages related to the fake package cgo
, nor did I see any errors with my vscode.
Solution
Okay... Finally, let me answer this question.
Why doesn’t it work
After quite some in-depth investigation, I found that it seems that Go (tools dist) does not allow source files in most go internals (Link)
Solution
There are still some workarounds to achieve this effect, namely using m5ops in go.
1. Pass function pointer through global variable
You can define global function pointers in proc.go
and import cgo in your go application and assign these global function pointers to your functions that perform m5ops. Does not support calling C function pointers, so it needs to be wrapped with golang functions.
2. Go to assembly
Go uses a lot of Go Asm in its internal source files to handle stack switching etc.
On the other hand, m5ops will eventually be inlined as a single directive.
So following Go Asm's syntax and function bindings, which happens in asm_amd64.s and stubs.go a>, one can write an asm function that contains the m5ops directive, and then # Call it anywhere in the ##runtime. go should be good.
- It seems that in
- runtime.go
when it switches to the system stack it can no longer execute functions outside of the file (or package?), so if you try to insert these function calls, method 1 Writing code that will run on the system stack does not work. So I finally discovered the second method.
The above is the detailed content of Modify go to use Gem5 m5ops: go tool dist displays import message and then exits. For more information, please follow other related articles on the PHP Chinese website!

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