runtime: EABI support for netbsd/arm is insufficient

[oshimaya]

1 What version of Go are you using (go version)?

Go 1.4 and Go 1.5 (maybe Go 1.3, too)

2 What operating system and processor architecture are you using?

• Host:

  • Linux(CentOS7) go version go1.4.2 linux/amd64

  • NetBSD/amd64 7.0 go version go1.5.1 netbsd/amd64

  • NetBSD/amd64 7.0 go version go1.4.3 netbsd/amd64

    This problem occurs on all host environments.

• Target:
  • NetBSD/evbarm 7.0 (EABI, PAGE_SIZE=4K kernel)

3 What did you do?

Simple test program

  package main
  import "fmt"
  func main() {
          fmt.Println("Hello World")
  }

  $ GOOS=netbsd GOARCH=arm go build .hello.go
  $ file hello
  hello: ELF 32-bit LSB executable, ARM, version 1 (NetBSD), statically linked, for NetBSD 5.99, not stripped

4 What did you expect to see?

  $ ./hello
  Hello World

5 What did you see instead?
When run on NetBSD/arm

 $ ./hello
 (no response, send KILL signal from another tty)
 [1]   Killed                  ./hello
 $ gdb ./hello
 (gdb) r
  Starting program: /tmp/hello

  Program received signal SIGSEGV, Segmentation fault.
  0x000383c4 in runtime.newosproc ()
      at /usr/lib/golang/src/runtime/os_netbsd.c:228

The reason of this is because the EABI support is insufficient.
Previous changes (at Mar 2014) are only in syscall packages:
30d6093
However runtime package is also a need to be changed.
Go1.5: src/runtime/defs1_netbsd_arm.go
Go1.4: src/runtime/defs_netbsd_arm.h
I think some types need padding bytes - timespec, timeval, mcontextt, ucontextt, keventt,
In addition, ELF header is also required EABI flag as same as Linux / FreeBSD.

I attached these patch for go1.5.
go_netbsd_earm_diff.txt

[minux]

Thanks, the patch looks good to me, please send a CL after Go 1.6 is released and the tree opens again. (around Feb. 1st) Or let me know if you prefer others to submit the Gerrit CL. I'd like to see if the defs.go file could be automatically generated by `go tool cgo -godefs` from runtime/defs_netbsd{,_arm}.go And btw, we will need a builder for netbsd/arm. Do you know someone who is willing to host one?

[gopherbot]

CL https://golang.org/cl/31651 mentions this issue.