在X64的linux机器上，使用新塘的交叉编译环境，编译了一个很简单的C可调用的动态测试库。
go的版本为1.11.5
代码如下：
package main
/*
#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
#include<string.h>
#include<stdbool.h>
#define RETURN_OK 1
#define RETURN_ERROR_INPUTPARAM 1001
typedef struct{
char version[256];
uint16_t size;
}VersionInfo;
*/
import "C"
import "fmt"
//export GetVersion
func GetVersion() C.int {
fmt.Println("GetVersion In")
return C.int(1)
}
func main() {
}
上面代码保存为versiontest.go，通过编译命令
go build -buildmode=c-shared -o libversiontest.so versiontest.go
生成 libversiontest.so和libversiontest.h文件
libversiontest.h文件内容如下：
/* Code generated by cmd/cgo; DO NOT EDIT. */
/* package command-line-arguments */
#line 1 "cgo-builtin-prolog"
#include <stddef.h> /* for ptrdiff_t below */
#ifndef GO_CGO_EXPORT_PROLOGUE_H
#define GO_CGO_EXPORT_PROLOGUE_H
typedef struct { const char *p; ptrdiff_t n; } _GoString_;
#endif
/* Start of preamble from import "C" comments. */
#line 3 "versiontest.go"
#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
#include<string.h>
#include<stdbool.h>
#define RETURN_OK 1
/* Code generated by cmd/cgo; DO NOT EDIT. */
/* package command-line-arguments */
#line 1 "cgo-builtin-prolog"
#include <stddef.h> /* for ptrdiff_t below */
#ifndef GO_CGO_EXPORT_PROLOGUE_H
#define GO_CGO_EXPORT_PROLOGUE_H
typedef struct { const char *p; ptrdiff_t n; } _GoString_;
#endif
/* Start of preamble from import "C" comments. */
#line 3 "versiontest.go"
#include<stdio.h>
#include<stdlib.h>
#include<stdint.h>
#include<string.h>
#include<stdbool.h>
#define RETURN_OK 1
#define RETURN_ERROR_INPUTPARAM 1001
typedef struct{
char version[256];
uint16_t size;
}VersionInfo;
#line 1 "cgo-generated-wrapper"
/* End of preamble from import "C" comments. */
/* Start of boilerplate cgo prologue. */
#line 1 "cgo-gcc-export-header-prolog"
#ifndef GO_CGO_PROLOGUE_H
#define GO_CGO_PROLOGUE_H
typedef signed char GoInt8;
typedef unsigned char GoUint8;
typedef short GoInt16;
typedef unsigned short GoUint16;
typedef int GoInt32;
typedef unsigned int GoUint32;
typedef long long GoInt64;
typedef unsigned long long GoUint64;
typedef GoInt32 GoInt;
typedef GoUint32 GoUint;
typedef __SIZE_TYPE__ GoUintptr;
typedef float GoFloat32;
typedef double GoFloat64;
typedef float _Complex GoComplex64;
typedef double _Complex GoComplex128;
/*
static assertion to make sure the file is being used on architecture
at least with matching size of GoInt.
*/
typedef char _check_for_32_bit_pointer_matching_GoInt[sizeof(void*)==32/8 ? 1:-1];
typedef _GoString_ GoString;
typedef void *GoMap;
typedef void *GoChan;
typedef struct { void *t; void *v; } GoInterface;
typedef struct { void *data; GoInt len; GoInt cap; } GoSlice;
#endif
/* End of boilerplate cgo prologue. */
#ifdef __cplusplus
extern "C" {
#endif
extern int GetVersion();
#ifdef __cplusplus
}
#endif
go编译环境设置：
GOARCH=arm
GOARM=5 //因为芯片架构为 ARMV5TEJ
CGO_ENABLED=1
CC和CXX设置为新唐提供的交叉编译环境中的编译器。
其他为默认设置。
编译可执行测试程序 testversion
编辑 testversion.c
#include "libversiontest.h"
int main(){
GetVersion();
return 1;
}
libversiontest.h和libversiontest.so都拷到testversion.c同一个目录下。
通过新塘gcc命令
arm-linux-gcc -I./ -L./ -lversiontest -o testversion testversion.c
生成testversion可执行程序。拷贝到新塘芯片上运行。报Segmentation fault
通过gdb查看，出错在
上传不了图片，直接手写了
Program received signal SIGILL, Illegal instruction.
_rt0_arm_lib () at /usr/local/go/src/runtime/asm_arm.s:46
46 MOVD F8, (40+8*0)(R13)
查看了asm_arm.s文件，截取了42~57行代码，如下
// Skip floating point registers on GOARM < 6. //42
MOVB runtime·goarm(SB), R11 //43
CMP $6, R11 //44
BLT skipfpsave //45
MOVD F8, (40+8*0)(R13) //46
MOVD F9, (40+8*1)(R13)
MOVD F10, (40+8*2)(R13)
MOVD F11, (40+8*3)(R13)
MOVD F12, (40+8*4)(R13)
MOVD F13, (40+8*5)(R13)
MOVD F14, (40+8*6)(R13)
MOVD F15, (40+8*7)(R13)
skipfpsave: //54
// Save argc/argv. //55
MOVW R0, _rt0_arm_lib_argc<>(SB) //56
MOVW R1, _rt0_arm_lib_argv<>(SB) //57
出错在46行
同样的代码在树莓派 Pi 2 model B(arm V7架构)上可以正常运行。
麻烦各位大神看一下是什么原因导致的？
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