DC-ROMA RISC-V Laptop II unavailable vector register in gdb

K1
, , ,
1

Hello great developers,

I have DC-ROMA RISC-V Laptop II equipped with SpacemiT’s SoC K1. I am using gdb to observe vector registers’ status on it. But in gdb it shows vector register is unavailable.

I have an ELF coming from the following cross compilation cmd:

RISCV_GNU_TOOLCHAIN_DIR="/install" 
#RISCV_GNU_TOOLCHAIN_DIR is riscv-toolchain installation path, `configure --prefix=/install --with-arch=rv64gcv --with-abi=lp64d`
CLANGPP="clang++ --target=riscv64-unknown-linux-gnu \
        --sysroot=${RISCV_GNU_TOOLCHAIN_DIR}/sysroot \
        --gcc-toolchain=${RISCV_GNU_TOOLCHAIN_DIR} \
        -march=rv64gcv -mabi=lp64d \
        -O2 -g"

# The following command is to compile from LLVM bit code and link necessary object files.
$CLANGPP \
         -fPIC \
         -c "${kernel_name}_kernel.bc" \
         -o "${kernel_name}.o"

$CLANGPP \
    -I "../env_build/include" \
    -c "${kernel_launcher}" \
    -fPIC \
    -o "${launcher_name}.o"

$CLANGPP ${main} \
    -I "../env_build/include" \
    -L "${LIB_DIR}" \
    -l"${lib_name}" \
    -lsupport \
    -latomic \
    -std=c++17 \
    -fPIC \
    -o "${OUT_ELF_DIR}/${kernel_name}.elf"

Then I use gdb like this:

aicompiler@aicompiler:~/work/riscv_test$ gdb _matmul_8_32_8_g.elf 
GNU gdb (Ubuntu 15.0.50.20240403-0ubuntu1bb1) 15.0.50.20240403-git
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Type "show copying" and "show warranty" for details.
This GDB was configured as "riscv64-linux-gnu".
Type "show configuration" for configuration details.
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<https://www.gnu.org/software/gdb/bugs/>.
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    <http://www.gnu.org/software/gdb/documentation/>.

For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from _matmul_8_32_8_g.elf...
(gdb) b *0x0000002aaaaac9fe
Breakpoint 1 at 0x2aaaaac9fe
(gdb) r
Starting program: /home/aicompiler/work/riscv_test/_matmul_8_32_8_g.elf 

This GDB supports auto-downloading debuginfo from the following URLs:
  <https://debuginfod.ubuntu.com>
Enable debuginfod for this session? (y or [n]) n
Debuginfod has been disabled.
To make this setting permanent, add 'set debuginfod enabled off' to .gdbinit.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/riscv64-linux-gnu/libthread_db.so.1".
Data shape 128x128x128x10

Breakpoint 1, 0x0000002aaaaac9fe in matmul_kernel () at matmul.py:217
warning: 217	matmul.py: No such file or directory
(gdb) set disassemble-next-line on
...
(gdb) ni
0x0000002aaaaaca16	217	in matmul.py
   0x0000002aaaaac9ec <matmul_kernel+210>:	00534463        	blt	t1,t0,0x2aaaaac9f4 <matmul_kernel+218>
   0x0000002aaaaac9f0 <matmul_kernel+214>:	6b80606f        	j	0x2aaaab30a8 <matmul_kernel+26510>
   0x0000002aaaaac9f4 <matmul_kernel+218>:	fc32              	sd	a2,56(sp)
   0x0000002aaaaac9f6 <matmul_kernel+220>:	e4fa              	sd	t5,72(sp)
   0x0000002aaaaac9f8 <matmul_kernel+222>:	e8f6              	sd	t4,80(sp)
   0x0000002aaaaac9fa <matmul_kernel+224>:	ecfe              	sd	t6,88(sp)
   0x0000002aaaaac9fc <matmul_kernel+226>:	4e81              	li	t4,0
   0x0000002aaaaac9fe <matmul_kernel+228>:	c2202673        	csrr	a2,vlenb
   0x0000002aaaaaca02 <matmul_kernel+232>:	0606              	slli	a2,a2,0x1
   0x0000002aaaaaca04 <matmul_kernel+234>:	960a              	add	a2,a2,sp
   0x0000002aaaaaca06 <matmul_kernel+236>:	6285              	lui	t0,0x1
   0x0000002aaaaaca08 <matmul_kernel+238>:	7c02829b        	addiw	t0,t0,1984 # 0x17c0
   0x0000002aaaaaca0c <matmul_kernel+242>:	9616              	add	a2,a2,t0
   0x0000002aaaaaca0e <matmul_kernel+244>:	e2860027        	vs8r.v	v0,(a2)
   0x0000002aaaaaca12 <matmul_kernel+248>:	9e03b857        	vmv8r.v	v16,v0
=> 0x0000002aaaaaca16 <matmul_kernel+252>:	e0ba              	sd	a4,64(sp)
(gdb) ni
206	in matmul.py
=> 0x0000002aaaaaca18 <matmul_kernel+254>:	8e076857        	vrem.vx	v16,v0,a4
(gdb) info register v
vstart         <unavailable>
vxsat          <unavailable>
vxrm           <unavailable>
vcsr           <unavailable>
vl             <unavailable>
vtype          <unavailable>
vlenb          <unavailable>
v0             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v1             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v2             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v3             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
--Type <RET> for more, q to quit, c to continue without paging--
v4             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v5             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v6             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v7             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v8             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v9             {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
--Type <RET> for more, q to quit, c to continue without paging--
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v10            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v11            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v12            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v13            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v14            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v15            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
--Type <RET> for more, q to quit, c to continue without paging--
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v16            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v17            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v18            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v19            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v20            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v21            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
--Type <RET> for more, q to quit, c to continue without paging--
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v22            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v23            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v24            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v25            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v26            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
--Type <RET> for more, q to quit, c to continue without paging--
v27            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v28            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v29            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v30            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}
v31            {q = {<unavailable>, <unavailable>}, l = {<unavailable>, <unavailable>, 
    <unavailable>, <unavailable>}, w = {<unavailable>, <unavailable>, <unavailable>, 
    <unavailable>, <unavailable>, <unavailable>, <unavailable>, <unavailable>}, s = {
    <unavailable> <repeats 16 times>}, b = {<unavailable> <repeats 32 times>}}

LLVM version:

yuhao@99-G1:~$ clang --version
clang version 18.1.8 (https://github.com/llvm/llvm-project.git 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
Target: riscv64-unknown-linux-gnu
Thread model: posix
InstalledDir: /opt/riscv/bin

My RISC-V laptop OS info:

aicompiler@aicompiler:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 24.04.1-V2.0.1 LTS
Release:	24.04
Codename:	noble
aicompiler@aicompiler:~$ uname -a
Linux aicompiler 6.6.36 #2.0.1.2 SMP PREEMPT Fri Oct 25 12:34:10 UTC 2024 riscv64 riscv64 riscv64 GNU/Linux

Is it not supporting vector registers now?
Should I change the OS?(hope not because I guess it is pretty brutal for that laptop)
Or what mistakes I made?

Thank you.

2

On bianbu os, gdb apply some patches to support vector.
bianbu-gdb.zip contains the deb and patches, you can try the deb package or apply patches to build your own gdb

2 Likes
3

Thanks a lot!