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Illegal Instruction during early init on Armv7 (xcompiled from darwin/amd64) #18483

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jdizzle opened this issue Jan 1, 2017 · 8 comments
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@jdizzle
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@jdizzle jdizzle commented Jan 1, 2017

Please answer these questions before submitting your issue. Thanks!

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

go version go1.6.3 darwin/amd64

installed via brew

What operating system and processor architecture are you using (go env)?

GOARCH="amd64"
GOBIN=""
GOEXE=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.6.3/libexec"
GOTOOLDIR="/usr/local/Cellar/go/1.6.3/libexec/pkg/tool/darwin_amd64"
GO15VENDOREXPERIMENT="1"
CC="clang"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common"
CXX="clang++"
CGO_ENABLED="1"

However I am cross compiling for a linux arm7 system

GOARM=7
GOARCH=arm
GOOS=linux

What did you do?

If possible, provide a recipe for reproducing the error.
A complete runnable program is good.
A link on play.golang.org is best.

// Our first program will print the classic "hello world"
// message. Here's the full source code.
package main

import "fmt"

func main() {
    fmt.Println("hello world")
}

What did you see instead?

The executable immediately crashes due to an illegal instruction signal. Here is the output of gdserver:

Program received signal SIGILL, Illegal instruction.
runtime.check () at /usr/local/Cellar/go/1.6.3/libexec/src/runtime/runtime1.go:152
152	/usr/local/Cellar/go/1.6.3/libexec/src/runtime/runtime1.go: No such file or directory.
(gdb) disass
Dump of assembler code for function runtime.check:
   0x00049f8c <+0>:	ldr	r1, [r10, #8]
   0x00049f90 <+4>:	cmp	sp, r1
   0x00049f94 <+8>:	bls	0x4a53c <runtime.check+1456>
   0x00049f98 <+12>:	str	lr, [sp, #-76]!	; 0xffffffb4
   0x00049f9c <+16>:	mov	r0, #0
   0x00049fa0 <+20>:	mov	r0, #0
   0x00049fa4 <+24>:	mov	r0, #0
   0x00049fa8 <+28>:	mov	r0, #0
   0x00049fac <+32>:	mov	r0, #0
   0x00049fb0 <+36>:	str	r0, [sp, #48]	; 0x30
   0x00049fb4 <+40>:	mov	r0, #0
   0x00049fb8 <+44>:	mov	r0, #0
   0x00049fbc <+48>:	mov	r1, #0
   0x00049fc0 <+52>:	mov	r0, #0
   0x00049fc4 <+56>:	mov	r1, #0
=> 0x00049fc8 <+60>:	vmov.f32	s0, #112	; 0x3f800000  1.0
   0x00049fcc <+64>:	vsub.f32	s0, s0, s0
   0x00049fd0 <+68>:	vstr	s0, [sp, #44]	; 0x2c
   0x00049fd4 <+72>:	vmov.f32	s0, #112	; 0x3f800000  1.0
   0x00049fd8 <+76>:	vsub.f32	s0, s0, s0
   0x00049fdc <+80>:	vstr	s0, [sp, #40]	; 0x28
   0x00049fe0 <+84>:	vmov.f64	d0, #112	; 0x3f800000  1.0
   0x00049fe4 <+88>:	vsub.f64	d0, d0, d0
   0x00049fe8 <+92>:	vstr	d0, [sp, #60]	; 0x3c
   0x00049fec <+96>:	vmov.f64	d0, #112	; 0x3f800000  1.0
   0x00049ff0 <+100>:	vsub.f64	d0, d0, d0
   0x00049ff4 <+104>:	vstr	d0, [sp, #52]	; 0x34
   0x00049ff8 <+108>:	mov	r0, #0
   0x00049ffc <+112>:	str	r0, [sp, #72]	; 0x48
   0x0004a000 <+116>:	mov	r0, #0
   0x0004a004 <+120>:	mov	r0, #0
   0x0004a008 <+124>:	mov	r0, #0
   0x0004a00c <+128>:	strb	r0, [sp, #36]	; 0x24
   0x0004a010 <+132>:	strb	r0, [sp, #37]	; 0x25
   0x0004a014 <+136>:	strb	r0, [sp, #38]	; 0x26
---Type <return> to continue, or q <return> to quit---q
Quit

It appears that the vmov.f32 instruction is not supported? I'm using a Cortex A9 chip, and the datasheet for the SoC shows the FPU. Is this possibly a software configuration issue on my end. I have ARM_THUMB=n in my kernel configuration.

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@minux minux commented Jan 1, 2017

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@jdizzle jdizzle commented Jan 1, 2017

I tried with GOARM=6. I get the same signal, but on a different instruction. Thanks for the reply!

Program received signal SIGILL, Illegal instruction.
0x0004a084 in runtime.check () at /usr/local/Cellar/go/1.6.3/libexec/src/runtime/runtime1.go:152
152	/usr/local/Cellar/go/1.6.3/libexec/src/runtime/runtime1.go: No such file or directory.
(gdb) disass
Dump of assembler code for function runtime.check:
   0x0004a044 <+0>:	ldr	r1, [r10, #8]
   0x0004a048 <+4>:	cmp	sp, r1
   0x0004a04c <+8>:	bls	0x4a5f4 <runtime.check+1456>
   0x0004a050 <+12>:	str	lr, [sp, #-76]!	; 0xffffffb4
   0x0004a054 <+16>:	mov	r0, #0
   0x0004a058 <+20>:	mov	r0, #0
   0x0004a05c <+24>:	mov	r0, #0
   0x0004a060 <+28>:	mov	r0, #0
   0x0004a064 <+32>:	mov	r0, #0
   0x0004a068 <+36>:	str	r0, [sp, #48]	; 0x30
   0x0004a06c <+40>:	mov	r0, #0
   0x0004a070 <+44>:	mov	r0, #0
   0x0004a074 <+48>:	mov	r1, #0
   0x0004a078 <+52>:	mov	r0, #0
   0x0004a07c <+56>:	mov	r1, #0
   0x0004a080 <+60>:	ldr	r11, [pc, #1404]	; 0x4a604 <runtime.check+1472>
=> 0x0004a084 <+64>:	vldr	s0, [r11]
   0x0004a088 <+68>:	vstr	s0, [sp, #44]	; 0x2c
   0x0004a08c <+72>:	ldr	r11, [pc, #1392]	; 0x4a604 <runtime.check+1472>
   0x0004a090 <+76>:	vldr	s0, [r11]
   0x0004a094 <+80>:	vstr	s0, [sp, #40]	; 0x28
   0x0004a098 <+84>:	ldr	r11, [pc, #1384]	; 0x4a608 <runtime.check+1476>
   0x0004a09c <+88>:	vldr	d0, [r11]
   0x0004a0a0 <+92>:	vstr	d0, [sp, #60]	; 0x3c
   0x0004a0a4 <+96>:	ldr	r11, [pc, #1372]	; 0x4a608 <runtime.check+1476>
   0x0004a0a8 <+100>:	vldr	d0, [r11]
   0x0004a0ac <+104>:	vstr	d0, [sp, #52]	; 0x34
   0x0004a0b0 <+108>:	mov	r0, #0
   0x0004a0b4 <+112>:	str	r0, [sp, #72]	; 0x48
   0x0004a0b8 <+116>:	mov	r0, #0
   0x0004a0bc <+120>:	mov	r0, #0
   0x0004a0c0 <+124>:	mov	r0, #0
   0x0004a0c4 <+128>:	strb	r0, [sp, #36]	; 0x24
   0x0004a0c8 <+132>:	strb	r0, [sp, #37]	; 0x25
   0x0004a0cc <+136>:	strb	r0, [sp, #38]	; 0x26

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@davecheney davecheney commented Jan 1, 2017

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@jdizzle jdizzle commented Jan 1, 2017

:~$ cat /proc/cpuinfo 
Processor	: ARMv7 Processor rev 0 (v7l)
processor	: 0
BogoMIPS	: 2393.70

processor	: 1
BogoMIPS	: 2393.70

Features	: swp half fastmult edsp tls 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x3
CPU part	: 0xc09
CPU revision	: 0
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@minux minux commented Jan 1, 2017

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@davecheney davecheney commented Jan 1, 2017

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@jdizzle jdizzle commented Jan 1, 2017

I'm using a BCM58625. I checked and found my kernel has VFP=n in the config. I switched it to VFP=y, recompiled, and the go code works!

Thank you very much for your prompt and useful assistance.

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@davecheney davecheney commented Jan 1, 2017

Not a problem, I'm glad you got it working.

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