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runtime,syscall: convert syscall on openbsd/amd64 to libc

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Convert the syscall package on openbsd/amd64 to use libc rather than performing
direct system calls.

Updates #36435

Change-Id: Ieb5926a91ed34f7c722e3667004ec484c86804ef
Reviewed-on: https://go-review.googlesource.com/c/go/+/270380
Trust: Joel Sing <joel@sing.id.au>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Joel Sing 2020-11-16 04:47:56 +11:00
parent 1d5e14632e
commit 8634a234df
19 changed files with 1770 additions and 181 deletions
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4
src/syscall/exec_unix.go
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@ -272,6 +272,7 @@ func runtime_AfterExec()
// avoids a build dependency for other platforms.
var execveLibc func(path uintptr, argv uintptr, envp uintptr) Errno
var execveDarwin func(path *byte, argv **byte, envp **byte) error
var execveOpenBSD func(path *byte, argv **byte, envp **byte) error
// Exec invokes the execve(2) system call.
func Exec(argv0 string, argv []string, envv []string) (err error) {
@ -299,6 +300,9 @@ func Exec(argv0 string, argv []string, envv []string) (err error) {
} else if runtime.GOOS == "darwin" || runtime.GOOS == "ios" {
// Similarly on Darwin.
err1 = execveDarwin(argv0p, &argvp[0], &envvp[0])
} else if runtime.GOOS == "openbsd" && runtime.GOARCH == "amd64" {
// Similarly on OpenBSD.
err1 = execveOpenBSD(argv0p, &argvp[0], &envvp[0])
} else {
_, _, err1 = RawSyscall(SYS_EXECVE,
uintptr(unsafe.Pointer(argv0p)),