如何解决RISC-V 未定义对“memcpy”的引用
我正在使用 RISC-V 32E 工具链来编译一些独立的 CPP 代码。我在下面遇到错误。
/opt/riscv32i/bin/riscv32-unknown-elf-g++ -Os -ffreestanding -o firmware/firmware.elf \
-Wl,-Bstatic,-T,firmware/sections.lds,-Map,firmware/firmware.map,--strip-debug \
firmware/start.o firmware/print.o firmware/stream.o firmware/main.o firmware/accel.o firmware/data_redir_m.o -lgcc -fno-threadsafe-statics -nostdlib
/opt/riscv32i/lib/gcc/riscv32-unknown-elf/8.2.0/../../../../riscv32-unknown-elf/bin/ld: firmware/data_redir_m.o: in function `.L31':
data_redir_m.cpp:(.text+0x442): undefined reference to `memcpy'
collect2: error: ld returned 1 exit status
Makefile:46: recipe for target 'firmware/firmware.elf' failed
make: *** [firmware/firmware.elf] Error 1
我想保持 hex 文件尽可能小,所以我的偏好是不使用 -lstdc++ 库。让我很困惑的是,为什么即使我在 data_redir_m.cpp 文件中手动添加 memcpy() 函数定义,它仍然会抱怨此类错误。
#include "typedefs.h"
void * memcpy ( void * destination,const void * source,int num ){
int i=0;
*((int*)destination) = *((int*)source);
}
static int check_clockwise( Triangle_2D triangle_2d )
{
int cw;
cw = (triangle_2d.x2 - triangle_2d.x0) * (triangle_2d.y1 - triangle_2d.y0)
- (triangle_2d.y2 - triangle_2d.y0) * (triangle_2d.x1 - triangle_2d.x0);
return cw;
}
// swap (x0,y0) (x1,y1) of a Triangle_2D
static void clockwise_vertices( Triangle_2D *triangle_2d )
{
bit8 tmp_x,tmp_y;
tmp_x = triangle_2d->x0;
tmp_y = triangle_2d->y0;
triangle_2d->x0 = triangle_2d->x1;
triangle_2d->y0 = triangle_2d->y1;
triangle_2d->x1 = tmp_x;
triangle_2d->y1 = tmp_y;
}
// find the min from 3 integers
static bit8 find_min( bit8 in0,bit8 in1,bit8 in2 )
{
if (in0 < in1)
{
if (in0 < in2)
return in0;
else
return in2;
}
else
{
if (in1 < in2)
return in1;
else
return in2;
}
}
// find the max from 3 integers
static bit8 find_max( bit8 in0,bit8 in2 )
{
if (in0 > in1)
{
if (in0 > in2)
return in0;
else
return in2;
}
else
{
if (in1 > in2)
return in1;
else
return in2;
}
}
// project a 3D triangle to a 2D triangle
void projection(
bit32 input_lo,bit32 input_mi,bit32 input_hi,Triangle_2D *triangle_2d
)
{
#pragma HLS INLINE off
Triangle_3D triangle_3d;
// Setting camera to (0,-1),the canvas at z=0 plane
// The 3D model lies in z>0 space
// The coordinate on canvas is proportional to the corresponding coordinate
// on space
bit2 angle = 0;
triangle_3d.x0 = bit8(input_lo( 7,0));
triangle_3d.y0 = bit8(input_lo(15,8));
triangle_3d.z0 = bit8(input_lo(23,16));
triangle_3d.x1 = bit8(input_lo(31,24));
triangle_3d.y1 = bit8(input_mi( 7,0));
triangle_3d.z1 = bit8(input_mi(15,8));
triangle_3d.x2 = bit8(input_mi(23,16));
triangle_3d.y2 = bit8(input_mi(31,24));
triangle_3d.z2 = bit8(input_hi( 7,0));
if(angle == 0)
{
triangle_2d->x0 = triangle_3d.x0;
triangle_2d->y0 = triangle_3d.y0;
triangle_2d->x1 = triangle_3d.x1;
triangle_2d->y1 = triangle_3d.y1;
triangle_2d->x2 = triangle_3d.x2;
triangle_2d->y2 = triangle_3d.y2;
triangle_2d->z = triangle_3d.z0 / 3 + triangle_3d.z1 / 3 + triangle_3d.z2 / 3;
}
else if(angle == 1)
{
triangle_2d->x0 = triangle_3d.x0;
triangle_2d->y0 = triangle_3d.z0;
triangle_2d->x1 = triangle_3d.x1;
triangle_2d->y1 = triangle_3d.z1;
triangle_2d->x2 = triangle_3d.x2;
triangle_2d->y2 = triangle_3d.z2;
triangle_2d->z = triangle_3d.y0 / 3 + triangle_3d.y1 / 3 + triangle_3d.y2 / 3;
}
else if(angle == 2)
{
triangle_2d->x0 = triangle_3d.z0;
triangle_2d->y0 = triangle_3d.y0;
triangle_2d->x1 = triangle_3d.z1;
triangle_2d->y1 = triangle_3d.y1;
triangle_2d->x2 = triangle_3d.z2;
triangle_2d->y2 = triangle_3d.y2;
triangle_2d->z = triangle_3d.x0 / 3 + triangle_3d.x1 / 3 + triangle_3d.x2 / 3;
}
}
// calculate bounding box for a 2D triangle
void rasterization1 (
Triangle_2D triangle_2d,hls::stream<ap_uint<32> > & Output_1,hls::stream<ap_uint<32> > & Output_2
)
{
Triangle_2D triangle_2d_same;
bit8 max_min[5];
max_min[0]=0;
max_min[1]=0;
max_min[2]=0;
max_min[3]=0;
max_min[4]=0;
bit16 max_index[1];
max_index[0]=0;
bit32 tmp1,tmp2,tmp3,tmp4;
static int parity = 0;
#pragma HLS INLINE off
// clockwise the vertices of input 2d triangle
if ( check_clockwise( triangle_2d ) == 0 ){
tmp1(7,0) = 1;
tmp1(15,8) = triangle_2d_same.x0;
tmp1(23,16) = triangle_2d_same.y0;
tmp1(31,24) = triangle_2d_same.x1;
tmp2(7,0) = triangle_2d_same.y1;
tmp2(15,8) = triangle_2d_same.x2;
tmp2(23,16) = triangle_2d_same.y2;
tmp2(31,24) = triangle_2d_same.z;
tmp3(15,0) = max_index[0];
tmp3(23,16) = max_min[0];
tmp3(31,24) = max_min[1];
tmp4(7,0) = max_min[2];
tmp4(15,8) = max_min[3];
tmp4(23,16) = max_min[4];
tmp4(31,24) = 0;
if(parity==0){
Output_1.write(tmp1);
Output_1.write(tmp2);
Output_1.write(tmp3);
Output_1.write(tmp4);
parity = 1;
}else{
Output_2.write(tmp1);
Output_2.write(tmp2);
Output_2.write(tmp3);
Output_2.write(tmp4);
parity = 0;
}
#ifdef PROFILE
data_redir_m_out_1+=4;
#endif
return;
}
if ( check_clockwise( triangle_2d ) < 0 )
clockwise_vertices( &triangle_2d );
// copy the same 2D triangle
triangle_2d_same.x0 = triangle_2d.x0;
triangle_2d_same.y0 = triangle_2d.y0;
triangle_2d_same.x1 = triangle_2d.x1;
triangle_2d_same.y1 = triangle_2d.y1;
triangle_2d_same.x2 = triangle_2d.x2;
triangle_2d_same.y2 = triangle_2d.y2;
triangle_2d_same.z = triangle_2d.z ;
// find the rectangle bounds of 2D triangles
max_min[0] = find_min( triangle_2d.x0,triangle_2d.x1,triangle_2d.x2 );
max_min[1] = find_max( triangle_2d.x0,triangle_2d.x2 );
max_min[2] = find_min( triangle_2d.y0,triangle_2d.y1,triangle_2d.y2 );
max_min[3] = find_max( triangle_2d.y0,triangle_2d.y2 );
max_min[4] = max_min[1] - max_min[0];
// calculate index for searching pixels
max_index[0] = (max_min[1] - max_min[0]) * (max_min[3] - max_min[2]);
tmp1(7,0) = 0;
tmp1(15,8) = triangle_2d_same.x0;
tmp1(23,16) = triangle_2d_same.y0;
tmp1(31,24) = triangle_2d_same.x1;
tmp2(7,0) = triangle_2d_same.y1;
tmp2(15,8) = triangle_2d_same.x2;
tmp2(23,16) = triangle_2d_same.y2;
tmp2(31,24) = triangle_2d_same.z;
tmp3(15,0) = max_index[0];
tmp3(23,16) = max_min[0];
tmp3(31,24) = max_min[1];
tmp4(7,0) = max_min[2];
tmp4(15,8) = max_min[3];
tmp4(23,16) = max_min[4];
tmp4(31,24) = 0;
if(parity==0){
Output_1.write(tmp1);
Output_1.write(tmp2);
Output_1.write(tmp3);
Output_1.write(tmp4);
parity = 1;
}else{
Output_2.write(tmp1);
Output_2.write(tmp2);
Output_2.write(tmp3);
Output_2.write(tmp4);
parity = 0;
}
return;
}
void data_redir_m (
hls::stream<ap_uint<32> > & Input_1,hls::stream<ap_uint<32> > & Output_2
)
{
#pragma HLS INTERFACE ap_hs port=Input_1
#pragma HLS INTERFACE ap_hs port=Output_1
#pragma HLS INTERFACE ap_hs port=Output_2
bit32 input_lo;
bit32 input_mi;
bit32 input_hi;
bit128 input_tmp;
hls::stream<ap_uint<32> > Output_1_1;
hls::stream<ap_uint<32> > Output_2_2;
Triangle_2D triangle_2ds_1;
Triangle_2D triangle_2ds_2;
input_lo = Input_1.read();
input_mi = Input_1.read();
input_hi = Input_1.read();
#ifdef PROFILE
data_redir_m_in_1+=3;
#endif
projection (input_lo,input_mi,input_hi,&triangle_2ds_1);
rasterization1 (triangle_2ds_1,Output_1,Output_2);
}
解决方法
如果要为非os环境搭建gcc,需要提前搭建newlib。并告诉gcc去哪里找libc,方式是在配置项目的时候声明sysroot。
您可以使用此脚本(ian910297/build-riscv-gnu-toolchain) 来构建 riscv gnu 工具链。如果选择此方法,请注意目录名称。
否则,riscv 官方也提供了类似的脚本来构建,如:riscv/riscv-gnu-toolchain)
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