RISCV学习（2）玄铁C910处理器体验
笔者有幸参加了平头哥RISCV开发者大赛，体验了一下基于玄铁C910内核的矽速开发板。
1、开发板介绍
LicheePi 4A 是基于 Lichee Module 4A 核心板的 高性能 RISC-V Linux 开发板。
- TH1520 为主控核心（4xC910@1.85G， RV64GCV，4TOPS@int8 NPU， 50GFLOP GPU）
- 板载最大 16GB 64bit LPDDR4X，128GB eMMC，
- 支持 HDMI+MIPI 双4K 显示输出，
- 支持 4K 摄像头接入，
- 支持双千兆网口（其中一个支持POE供电）
- 4 个 USB3.0 接口，
- 多种音频输入输出（由专用 C906 核心处理）。-
2、GCC工具链使用
GCC的工具链安装，参考Licheepi GCC工具链安装。
- 查看gcc的工具链版本
root@lpi4a:~# gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/riscv64-linux-gnu/10/lto-wrapper Target: riscv64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 10.4.0-8revyos2.4' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs --enable-languages=c,ada,c++,go,d,fortran,objc,obj-c++,m2 --prefix=/usr --with-gcc-major-version-only --program-suffix=-10 --program-prefix=riscv64-linux-gnu- --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --libdir=/usr/lib --enable-nls --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --with-default-libstdcxx-abi=new --enable-gnu-unique-object --disable-libitm --disable-libsanitizer --disable-libquadmath --disable-libquadmath-support --enable-plugin --enable-default-pie --with-system-zlib --enable-libphobos-checking=release --with-target-system-zlib=auto --enable-objc-gc=auto --enable-multiarch --disable-werror --disable-multilib --with-arch=rv64gcv0p7_zfh_xtheadc --with-abi=lp64d --enable-checking=release --build=riscv64-linux-gnu --host=riscv64-linux-gnu --target=riscv64-linux-gnu Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.4.0 (Debian 10.4.0-8revyos2.4) - 直接编译hello.c程序，提示需要设置xthreadc的版本，其实并不知道如何处理，经过查资料后发现，需要指明架构和二进制接口版本
gcc hello.c Assembler messages: Error: x ISA extension `xtheadc' must be set with the versions - 然后根据提示指明了架构，发现对应的头文件找不到，怀疑工具链没安装对，重新安装了，但是依然没什么用，之后又重启了，还是不行，看来还得继续找问题。
gcc hello.c -march=rv64imc In file included from /usr/include/features.h:513, from /usr/include/riscv64-linux-gnu/bits/libc-header-start.h:33, from /usr/include/stdio.h:27, from hello.c:1: /usr/include/riscv64-linux-gnu/gnu/stubs.h:14:11: fatal error: gnu/stubs-lp64.h: No such file or directory 14 | # include <gnu/stubs-lp64.h> - 然后就看一下该文件的内容，以及去该目录下面搜索了有哪些文件
root@lpi4a:~# ls /usr/include/riscv64-linux-gnu/gnu/stubs.h /usr/include/riscv64-linux-gnu/gnu/stubs.h root@lpi4a:~# cat /usr/include/riscv64-linux-gnu/gnu/stubs.h /* This file is automatically generated. This file selects the right generated file of `__stub_FUNCTION' macros based on the architecture being compiled for. */ #include <bits/wordsize.h> #if __WORDSIZE == 32 && defined __riscv_float_abi_soft # include <gnu/stubs-ilp32.h> #endif #if __WORDSIZE == 32 && defined __riscv_float_abi_double # include <gnu/stubs-ilp32d.h> #endif #if __WORDSIZE == 64 && defined __riscv_float_abi_soft # include <gnu/stubs-lp64.h> #endif #if __WORDSIZE == 64 && defined __riscv_float_abi_double # include <gnu/stubs-lp64d.h> #endifls /usr/include/riscv64-linux-gnu/gnu/ lib-names-lp64d.h lib-names.h libc-version.h stubs-lp64d.h stubs.h - 看到这里就突然知道，需要指明对应的版本，不然相应的头文件找不到，果然和常规的GCC工具链使用还是有区别，增加了相应的abl版本后，发现march也需要版本，
gcc hello.c -march=rv64imc -mabi=lp64d cc1: error: requested ABI requires '-march' to subsume the 'D' extension - 在架构方面增加了d，发现还是不对，提示第一个指令集是e/i/g，还得修改
gcc hello.c -march=rv64dimc -mabi=lp64d gcc: error: '-march=rv64dimc': first ISA subset must be 'e', 'i' or 'g' - 然后修改了abl的，改成了e，发现abl的版本里面没有这个，必须是lp64d，所以又得改回去
gcc hello.c -march=rv64imc -mabi=lp64e gcc: error: unrecognized argument in option '-mabi=lp64e' gcc: note: valid arguments to '-mabi=' are: ilp32 ilp32d ilp32e ilp32f lp64 lp64d lp64dv lp64f lp64v; did you mean 'lp64'? - 最后在march指令集的后面增加d，可以了，终于gcc工具链可以正常使用了。
root@lpi4a:~# gcc hello.c -march=rv64imafd -mabi=lp64d root@lpi4a:~# - readelf工具可以查看其out文件信息，RISC-V的machine的64位机器版本
root@lpi4a:~# readelf -a a.out ELF Header: Magic: 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 Class: ELF64 Data: 2's complement, little endian Version: 1 (current) OS/ABI: UNIX - System V ABI Version: 0 Type: DYN (Position-Independent Executable file) Machine: RISC-V Version: 0x1 Entry point address: 0x5b0 Start of program headers: 64 (bytes into file) Start of section headers: 7168 (bytes into file) Flags: 0x5, RVC, double-float ABI Size of this header: 64 (bytes) Size of program headers: 56 (bytes) Number of program headers: 10 Size of section headers: 64 (bytes) Number of section headers: 28 Section header string table index: 27 - 再看看其他Section、Segment等信息
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .interp PROGBITS 0000000000000270 00000270
0000000000000021 0000000000000000 A 0 0 1
[ 2] .note.gnu.bu[...] NOTE 0000000000000294 00000294
0000000000000024 0000000000000000 A 0 0 4
[ 3] .note.ABI-tag NOTE 00000000000002b8 000002b8
0000000000000020 0000000000000000 A 0 0 4
[ 4] .gnu.hash GNU_HASH 00000000000002d8 000002d8
0000000000000024 0000000000000000 A 5 0 8
[ 5] .dynsym DYNSYM 0000000000000300 00000300
00000000000000c0 0000000000000018 A 6 2 8
[ 6] .dynstr STRTAB 00000000000003c0 000003c0
000000000000007d 0000000000000000 A 0 0 1
[ 7] .gnu.version VERSYM 000000000000043e 0000043e
0000000000000010 0000000000000002 A 5 0 2
[ 8] .gnu.version_r VERNEED 0000000000000450 00000450
0000000000000030 0000000000000000 A 6 1 8
[ 9] .rela.dyn RELA 0000000000000480 00000480
00000000000000c0 0000000000000018 A 5 0 8
[10] .rela.plt RELA 0000000000000540 00000540
0000000000000030 0000000000000018 AI 5 21 8
[11] .plt PROGBITS 0000000000000570 00000570
0000000000000040 0000000000000010 AX 0 0 16
[12] .text PROGBITS 00000000000005b0 000005b0
0000000000000108 0000000000000000 AX 0 0 16
[13] .rodata PROGBITS 00000000000006b8 000006b8
0000000000000015 0000000000000000 A 0 0 8
[14] .eh_frame_hdr PROGBITS 00000000000006d0 000006d0
0000000000000014 0000000000000000 A 0 0 4
[15] .eh_frame PROGBITS 00000000000006e8 000006e8
000000000000002c 0000000000000000 A 0 0 8
[16] .preinit_array PREINIT_ARRAY 0000000000001e08 00000e08
0000000000000008 0000000000000008 WA 0 0 1
[17] .init_array INIT_ARRAY 0000000000001e10 00000e10
0000000000000008 0000000000000008 WA 0 0 8
[18] .fini_array FINI_ARRAY 0000000000001e18 00000e18
0000000000000008 0000000000000008 WA 0 0 8
[19] .dynamic DYNAMIC 0000000000001e20 00000e20
00000000000001e0 0000000000000010 WA 6 0 8
[20] .data PROGBITS 0000000000002000 00001000
0000000000000008 0000000000000000 WA 0 0 8
[21] .got PROGBITS 0000000000002008 00001008
0000000000000048 0000000000000008 WA 0 0 8
[22] .bss NOBITS 0000000000002050 00001050
0000000000000008 0000000000000000 WA 0 0 1
[23] .comment PROGBITS 0000000000000000 00001050
0000000000000027 0000000000000001 MS 0 0 1
[24] .riscv.attributes RISCV_ATTRIBUTE 0000000000000000 00001077
0000000000000106 0000000000000000 0 0 1
[25] .symtab SYMTAB 0000000000000000 00001180
0000000000000630 0000000000000018 26 47 8
[26] .strtab STRTAB 0000000000000000 000017b0
000000000000033c 0000000000000000 0 0 1
[27] .shstrtab STRTAB 0000000000000000 00001aec
000000000000010f 0000000000000000 0 0 1
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
D (mbind), p (processor specific)
There are no section groups in this file.
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
PHDR 0x0000000000000040 0x0000000000000040 0x0000000000000040
0x0000000000000230 0x0000000000000230 R 0x8
INTERP 0x0000000000000270 0x0000000000000270 0x0000000000000270
0x0000000000000021 0x0000000000000021 R 0x1
[Requesting program interpreter: /lib/ld-linux-riscv64-lp64d.so.1]
RISCV_ATTRIBUT 0x0000000000001077 0x0000000000000000 0x0000000000000000
0x0000000000000106 0x0000000000000000 R 0x1
LOAD 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000714 0x0000000000000714 R E 0x1000
LOAD 0x0000000000000e08 0x0000000000001e08 0x0000000000001e08
0x0000000000000248 0x0000000000000250 RW 0x1000
DYNAMIC 0x0000000000000e20 0x0000000000001e20 0x0000000000001e20
0x00000000000001e0 0x00000000000001e0 RW 0x8
NOTE 0x0000000000000294 0x0000000000000294 0x0000000000000294
0x0000000000000044 0x0000000000000044 R 0x4
GNU_EH_FRAME 0x00000000000006d0 0x00000000000006d0 0x00000000000006d0
0x0000000000000014 0x0000000000000014 R 0x4
GNU_STACK 0x0000000000000000 0x0000000000000000 0x0000000000000000
0x0000000000000000 0x0000000000000000 RW 0x10
GNU_RELRO 0x0000000000000e08 0x0000000000001e08 0x0000000000001e08
0x00000000000001f8 0x00000000000001f8 R 0x1
Section to Segment mapping:
Segment Sections...
00
01 .interp
02 .riscv.attributes
03 .interp .note.gnu.build-id .note.ABI-tag .gnu.hash .dynsym .dynstr .gnu.version .gnu.version_r .rela.dyn .rela.plt .plt .text .rodata .eh_frame_hdr .eh_frame
04 .preinit_array .init_array .fini_array .dynamic .data .got .bss
05 .dynamic
06 .note.gnu.build-id .note.ABI-tag
07 .eh_frame_hdr
08
09 .preinit_array .init_array .fini_array .dynamic
Dynamic section at offset 0xe20 contains 26 entries:
Tag Type Name/Value
0x0000000000000001 (NEEDED) Shared library: [libc.so.6]
0x0000000000000020 (PREINIT_ARRAY) 0x1e08
0x0000000000000021 (PREINIT_ARRAYSZ) 8 (bytes)
0x0000000000000019 (INIT_ARRAY) 0x1e10
0x000000000000001b (INIT_ARRAYSZ) 8 (bytes)
0x000000000000001a (FINI_ARRAY) 0x1e18
0x000000000000001c (FINI_ARRAYSZ) 8 (bytes)
0x000000006ffffef5 (GNU_HASH) 0x2d8
0x0000000000000005 (STRTAB) 0x3c0
0x0000000000000006 (SYMTAB) 0x300
0x000000000000000a (STRSZ) 125 (bytes)
0x000000000000000b (SYMENT) 24 (bytes)
0x0000000000000015 (DEBUG) 0x0
0x0000000000000003 (PLTGOT) 0x2008
0x0000000000000002 (PLTRELSZ) 48 (bytes)
0x0000000000000014 (PLTREL) RELA
0x0000000000000017 (JMPREL) 0x540
0x0000000000000007 (RELA) 0x480
0x0000000000000008 (RELASZ) 240 (bytes)
0x0000000000000009 (RELAENT) 24 (bytes)
0x000000006ffffffb (FLAGS_1) Flags: PIE
0x000000006ffffffe (VERNEED) 0x450
0x000000006fffffff (VERNEEDNUM) 1
0x000000006ffffff0 (VERSYM) 0x43e
0x000000006ffffff9 (RELACOUNT) 5
0x0000000000000000 (NULL) 0x0
Relocation section '.rela.dyn' at offset 0x480 contains 8 entries:
Offset Info Type Sym. Value Sym. Name + Addend
000000001e08 000000000003 R_RISCV_RELATIVE 5d2
000000001e10 000000000003 R_RISCV_RELATIVE 680
000000001e18 000000000003 R_RISCV_RELATIVE 640
000000002000 000000000003 R_RISCV_RELATIVE 2000
000000002038 000000000003 R_RISCV_RELATIVE 684
000000002030 000300000002 R_RISCV_64 0000000000000000 _ITM_deregisterTM[...] + 0
000000002040 000500000002 R_RISCV_64 0000000000000000 __cxa_finalize@GLIBC_2.27 + 0
000000002048 000600000002 R_RISCV_64 0000000000000000 _ITM_registerTMCl[...] + 0
Relocation section '.rela.plt' at offset 0x540 contains 2 entries:
Offset Info Type Sym. Value Sym. Name + Addend
000000002018 000200000005 R_RISCV_JUMP_SLOT 0000000000000000 __libc_start_main@GLIBC_2.34 + 0
000000002020 000400000005 R_RISCV_JUMP_SLOT 0000000000000000 puts@GLIBC_2.27 + 0
The decoding of unwind sections for machine type RISC-V is not currently supported.
Symbol table '.dynsym' contains 8 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000000005b0 0 SECTION LOCAL DEFAULT 12 .text
2: 0000000000000000 0 FUNC GLOBAL DEFAULT UND _[...]@GLIBC_2.34 (2)
3: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterT[...]
4: 0000000000000000 0 FUNC GLOBAL DEFAULT UND puts@GLIBC_2.27 (3)
5: 0000000000000000 0 FUNC WEAK DEFAULT UND _[...]@GLIBC_2.27 (3)
6: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_registerTMC[...]
7: 0000000000000684 52 FUNC GLOBAL DEFAULT 12 main
Symbol table '.symtab' contains 66 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 0000000000000270 0 SECTION LOCAL DEFAULT 1 .interp
2: 0000000000000294 0 SECTION LOCAL DEFAULT 2 .note.gnu.build-id
3: 00000000000002b8 0 SECTION LOCAL DEFAULT 3 .note.ABI-tag
4: 00000000000002d8 0 SECTION LOCAL DEFAULT 4 .gnu.hash
5: 0000000000000300 0 SECTION LOCAL DEFAULT 5 .dynsym
6: 00000000000003c0 0 SECTION LOCAL DEFAULT 6 .dynstr
7: 000000000000043e 0 SECTION LOCAL DEFAULT 7 .gnu.version
8: 0000000000000450 0 SECTION LOCAL DEFAULT 8 .gnu.version_r
9: 0000000000000480 0 SECTION LOCAL DEFAULT 9 .rela.dyn
10: 0000000000000540 0 SECTION LOCAL DEFAULT 10 .rela.plt
11: 0000000000000570 0 SECTION LOCAL DEFAULT 11 .plt
12: 00000000000005b0 0 SECTION LOCAL DEFAULT 12 .text
13: 00000000000006b8 0 SECTION LOCAL DEFAULT 13 .rodata
14: 00000000000006d0 0 SECTION LOCAL DEFAULT 14 .eh_frame_hdr
15: 00000000000006e8 0 SECTION LOCAL DEFAULT 15 .eh_frame
16: 0000000000001e08 0 SECTION LOCAL DEFAULT 16 .preinit_array
17: 0000000000001e10 0 SECTION LOCAL DEFAULT 17 .init_array
18: 0000000000001e18 0 SECTION LOCAL DEFAULT 18 .fini_array
19: 0000000000001e20 0 SECTION LOCAL DEFAULT 19 .dynamic
20: 0000000000002000 0 SECTION LOCAL DEFAULT 20 .data
21: 0000000000002008 0 SECTION LOCAL DEFAULT 21 .got
22: 0000000000002050 0 SECTION LOCAL DEFAULT 22 .bss
23: 0000000000000000 0 SECTION LOCAL DEFAULT 23 .comment
24: 0000000000000000 0 SECTION LOCAL DEFAULT 24 .riscv.attributes
25: 0000000000000000 0 FILE LOCAL DEFAULT ABS Scrt1.o
26: 00000000000002b8 32 OBJECT LOCAL DEFAULT 3 __abi_tag
27: 00000000000005b0 0 NOTYPE LOCAL DEFAULT 12 $xrv64i2p0_m2p0_[...]
28: 00000000000005d2 0 NOTYPE LOCAL DEFAULT 12 load_gp
29: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff.c
30: 00000000000005e0 0 NOTYPE LOCAL DEFAULT 12 $xrv64i2p0_m2p0_[...]
31: 00000000000005e0 0 FUNC LOCAL DEFAULT 12 deregister_tm_clones
32: 0000000000000610 0 FUNC LOCAL DEFAULT 12 register_tm_clones
33: 0000000000000640 0 FUNC LOCAL DEFAULT 12 __do_global_dtors_aux
34: 0000000000002050 1 OBJECT LOCAL DEFAULT 22 completed.0
35: 0000000000001e18 0 OBJECT LOCAL DEFAULT 18 __do_global_dtor[...]
36: 0000000000000680 0 FUNC LOCAL DEFAULT 12 frame_dummy
37: 0000000000001e10 0 OBJECT LOCAL DEFAULT 17 __frame_dummy_in[...]
38: 0000000000000000 0 FILE LOCAL DEFAULT ABS hello.c
39: 0000000000000684 0 NOTYPE LOCAL DEFAULT 12 $xrv64i2p0_m2p0_[...]
40: 0000000000000000 0 FILE LOCAL DEFAULT ABS crtstuff.c
41: 0000000000000710 0 OBJECT LOCAL DEFAULT 15 __FRAME_END__
42: 0000000000000000 0 FILE LOCAL DEFAULT ABS
43: 0000000000000570 0 OBJECT LOCAL DEFAULT ABS _PROCEDURE_LINKA[...]
44: 0000000000001e20 0 OBJECT LOCAL DEFAULT ABS _DYNAMIC
45: 00000000000006d0 0 NOTYPE LOCAL DEFAULT 14 __GNU_EH_FRAME_HDR
46: 0000000000002028 0 OBJECT LOCAL DEFAULT ABS _GLOBAL_OFFSET_TABLE_
47: 0000000000000000 0 FUNC GLOBAL DEFAULT UND __libc_start_mai[...]
48: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_deregisterT[...]
49: 0000000000002000 0 NOTYPE WEAK DEFAULT 20 data_start
50: 0000000000002058 0 NOTYPE GLOBAL DEFAULT 22 __BSS_END__
51: 0000000000002050 0 NOTYPE GLOBAL DEFAULT 21 _edata
52: 0000000000002050 0 NOTYPE GLOBAL DEFAULT 21 __SDATA_BEGIN__
53: 0000000000002000 0 NOTYPE GLOBAL DEFAULT 20 __DATA_BEGIN__
54: 0000000000002000 0 NOTYPE GLOBAL DEFAULT 20 __data_start
55: 0000000000002000 0 OBJECT GLOBAL HIDDEN 20 __dso_handle
56: 00000000000006b8 4 OBJECT GLOBAL DEFAULT 13 _IO_stdin_used
57: 0000000000002058 0 NOTYPE GLOBAL DEFAULT 22 _end
58: 00000000000005b0 34 FUNC GLOBAL DEFAULT 12 _start
59: 0000000000002800 0 NOTYPE GLOBAL DEFAULT ABS __global_pointer$
60: 0000000000000000 0 FUNC GLOBAL DEFAULT UND puts@GLIBC_2.27
61: 0000000000002050 0 NOTYPE GLOBAL DEFAULT 22 __bss_start
62: 0000000000000684 52 FUNC GLOBAL DEFAULT 12 main
63: 0000000000000000 0 FUNC WEAK DEFAULT UND __cxa_finalize@G[...]
64: 0000000000002008 0 OBJECT GLOBAL HIDDEN 21 __TMC_END__
65: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _ITM_registerTMC[...]
Histogram for `.gnu.hash' bucket list length (total of 2 buckets):
Length Number % of total Coverage
0 1 ( 50.0%)
1 1 ( 50.0%) 100.0%
Version symbols section '.gnu.version' contains 8 entries:
Addr: 0x000000000000043e Offset: 0x0000043e Link: 5 (.dynsym)
000: 0 (*local*) 0 (*local*) 2 (GLIBC_2.34) 1 (*global*)
004: 3 (GLIBC_2.27) 3 (GLIBC_2.27) 1 (*global*) 1 (*global*)
Version needs section '.gnu.version_r' contains 1 entry:
Addr: 0x0000000000000450 Offset: 0x00000450 Link: 6 (.dynstr)
000000: Version: 1 File: libc.so.6 Cnt: 2
0x0010: Name: GLIBC_2.27 Flags: none Version: 3
0x0020: Name: GLIBC_2.34 Flags: none Version: 2
Displaying notes found in: .note.gnu.build-id
Owner Data size Description
GNU 0x00000014 NT_GNU_BUILD_ID (unique build ID bitstring)
Build ID: 04af9f13e57b18e206a946570b7a6c8f6a078c86
Displaying notes found in: .note.ABI-tag
Owner Data size Description
GNU 0x00000010 NT_GNU_ABI_TAG (ABI version tag)
OS: Linux, ABI: 4.15.0
Attribute Section: riscv
File Attributes- 最后这个目标板的架构
Tag_RISCV_arch: "rv64i2p0_m2p0_a2p0_f2p0_d2p0_c2p0_v0p7_zmmul1p0_zfh1p0_zfhmin1p0_xtheadba1p0_xtheadbb1p0_xtheadbs1p0_xtheadc1p0_xtheadcmo1p0_xtheadcondmov1p0_xtheadfmemidx1p0_xtheadfmv1p0_xtheadint1p0_xtheadmac1p0_xtheadmemidx1p0_xtheadmempair1p0_xtheadsync1p0"
注意事项：
1、安装是需要后面添加参数 --fix-missing（根据提示）
2、安装时系统可能会卡死，这时候安装包可能损坏，需要修复这个问题，dpkg --configure -a，
3、继续安装的时候，又会发现没有依赖或者依赖关系不对，需要apt --fix-broken install
3、参考
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