Comments (18)
sylefeb
commented on June 3, 2024
1
I'll write about results
Please let us know, hopefully we can make it work as well.
Btw, after a bit of searching, there is a simpler approach! The trick is to let gcc do the link because it knows where the libs are (found the hint at the bottom of the answer: https://stackoverflow.com/questions/64603070/risc-v-linker-cannot-find-lgcc ).
We can then use -lm (for math) and -nostartfiles (to use our custom crt0).
$ARCH-as -march=rv32i -mabi=ilp32 -o crt0.o $BASE/crt0.s
$ARCH-gcc -DICESTICK -nostartfiles -fno-builtin -fno-unroll-loops -O1 -fno-stack-protector -fno-pic -march=rv32i -mabi=ilp32 -T $BASE/config_c.ld -o $DST/code.elf $1 crt0.o -lm
That is way cleaner, I'll update my scripts accordingly.
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ShervinShokouhi
commented on June 3, 2024
1
I compiled my code and tested it.
About your latest compilation script tested, I don't check it yet.
Newlib is fantastic, thank you @sylefeb.
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sylefeb
commented on June 3, 2024
1
Thanks for the feedback and tests! I'll close the issue for now but feel free to reopen if needed.
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rob-ng15
commented on June 3, 2024
You'll need to pass a flag to link to newlib and the gcc support libraries.
These will be located at something like:
/usr/riscv64-elf/lib/rv32i/ilp32f/libc.a
/usr/riscv64-elf/lib/rv32i/ilp32f/libm.a
/usr/lib/gcc/riscv64-elf/12.1.0/rv32i/ilp32f/libgcc.a
Don't worry about the riscv64 as these are the 32 bit versions of the
libraries. Yours may indeed be at riscv32.
You'll also need a crt0.o file which provides the _start symbol,
initialises the stack pointer and jumps to main().
So something like:
riscv32-unknown-elf-gcc -fno-unroll-loops -O1 -fno-stack-protector -fno-pic
-march=rv32i -mabi=ilp32 \
/usr/riscv64-elf/lib/rv32i/ilp32f/libc.a \
/usr/riscv64-elf/lib/rv32i/ilp32f/libm.a \
/usr/lib/gcc/riscv64-elf/12.1.0/rv32i/ilp32f/libgcc.a \
-c -o test.o test.c
This doesn't provide crt0.o though, but it should get you further.
Alternatively, use theis compile script from Sylefeb as a basis?
https://github.com/sylefeb/Silice/blob/master/projects/ice-v/compile/icestick/compile_c.sh
…On Sun, 15 May 2022 at 20:37, ShervinShokouhi ***@***.***> wrote:
Assume you have below code (neglect about puts and putchar) how I cane use
newlib to compile this code?
Compile cmd:
riscv32-unknown-elf-gcc -fno-unroll-loops -O1 -fno-stack-protector
-fno-pic -march=rv32i -mabi=ilp32 -c -o test.o test.c
Code:
#include <stdio.h>
int main()
{
int k = 2;
float i,j,r,x,y=-16;
while (puts(""), y++<15)
for (x=0; x++<84; putchar(" .:-;!/>)|&IH%
*#"[k&15])) for (i=k=r=0; j=r*r-i*i-2+x/25,i=2*r*i+y/10,j*
j+i*i<11&&k++<111;
r=j);
return 0;
}
I get these error messages:
riscv32-unknown-elf-ld -m elf32lriscv -b elf32-littleriscv --no-relax -lm
-o test.elf test.o
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
warning: cannot find entry symbol _start; defaulting to 0000000000010074
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.o: in function main': test.c:(.text+0x40): undefined reference to
puts'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0xb4): undefined reference to putchar'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0xc8): undefined reference to __addsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0xdc): undefined reference to __ltsf2'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0xf4): undefined reference to __divsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x108): undefined reference to __divsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x130): undefined reference to __mulsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x144): undefined reference to __mulsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x154): undefined reference to __subsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x160): undefined reference to __subsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x16c): undefined reference to __addsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x180): undefined reference to __addsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x18c): undefined reference to __mulsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x198): undefined reference to __addsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x1ac): undefined reference to __mulsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x1c0): undefined reference to __mulsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x1d0): undefined reference to __addsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x1dc): undefined reference to __ltsf2'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x1fc): undefined reference to puts'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x20c): undefined reference to __addsf3'
F:\Silice\Toolchains\riscv32-unknown-elf\bin\riscv32-unknown-elf-ld.exe:
test.c:(.text+0x220): undefined reference to __ltsf2'
Help me about GCC, AS, LD and rest settings to create HEX file from C with
NewLib support.
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ShervinShokouhi
commented on June 3, 2024
Thanks for your help, but where is "--specs=nano.specs" inside "https://github.com/sylefeb/Silice/blob/master/projects/ice-v/compile/icestick/compile_c.sh" script?
I used ice-v scripts but caused: undefined reference to __subsf3'
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rob-ng15
commented on June 3, 2024
Did you include /usr/lib/gcc/riscv64-elf/12.1.0/rv32i/ilp32f/libgcc.a as
that should be in there?
…On Mon, 16 May 2022 at 11:21, ShervinShokouhi ***@***.***> wrote:
Thanks for your help, but where is "--specs=nano.specs" inside "
https://github.com/sylefeb/Silice/blob/master/projects/ice-v/compile/icestick/compile_c.sh"
script?
I used ice-v scripts but caused: undefined reference to __subsf3'
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sylefeb
commented on June 3, 2024
Hi @ShervinShokouhi, Hi @rob-ng15,
This missing entry is due to floating point emulation not being found by the linker. I never had to use it (I do fixed point / integer only) but we definitely need that to work. I'll try to look into the issue as soon as possible but @rob-ng15 has definitely more experience on this. Rob, I believe you did compile with floating point emulation in the past, right?
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rob-ng15
commented on June 3, 2024
Yes, I believe that the floating point emulation is in the libgcc.a file.
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rob-ng15
commented on June 3, 2024
Just realised that I've given the paths to the versions that have hardware floating point support, I think you need to remove the f from the end of ip32
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rob-ng15
commented on June 3, 2024
So the correct line is:
riscv32-unknown-elf-gcc -fno-unroll-loops -O1 -fno-stack-protector -fno-pic
-march=rv32i -mabi=ilp32 \
/usr/riscv64-elf/lib/rv32i/ilp32/libc.a \
/usr/riscv64-elf/lib/rv32i/ilp32/libm.a \
/usr/lib/gcc/riscv64-elf/12.1.0/rv32i/ilp32/libgcc.a \
-c -o test.o test.c
That was my error, the correct libraries are listed above. My CPU has
floating point support, so ilp32f is correct, without floating point it is
ilp32.
Try those libraries with the linker script and you should be fine.
Apologies.
…On Mon, 16 May 2022 at 13:46, sylefeb ***@***.***> wrote:
Hi @ShervinShokouhi <https://github.com/ShervinShokouhi>, Hi @rob-ng15
<https://github.com/rob-ng15>,
This missing entry is due to floating point emulation not being found by
the linker. I never had to use it (I do fixed point / integer only) but we
definitely need that to work. I'll try to look into the issue as soon as
possible but @rob-ng15 <https://github.com/rob-ng15> has definitely more
experience on this. Rob, I believe you did compile with floating point
emulation in the past, right?
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ShervinShokouhi
commented on June 3, 2024
Hi @sylefeb, @rob-ng15
Thanks for your detailed descriptions, now I'm able to compile C file to O. But in linker stage again asks for MATH functions:
C:\msys64\mingw64\bin\riscv64-unknown-elf-ld.exe: main.c:(.text+0x1e0): undefined reference to `__mulsf3'
How to link newlib library in linker stage?
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rob-ng15
commented on June 3, 2024
Have a look in your gcc directories for libgcc and put that path in,ale sue is it for rve2i and ilp32
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ShervinShokouhi
commented on June 3, 2024
Its my gcc command (Toolchain is made for RV32I with NewLib):
riscv32-unknown-elf-gcc -fno-unroll-loops -O1 -fno-stack-protector -fno-pic -march=rv32i -mabi=ilp32 --specs=nano.specs -LF:\Silice\Toolchains\riscv32-unknown-elf\riscv32-unknown-elf\lib\rv32i\ilp32/libc.a -L-LF:\Silice\Toolchains\riscv32-unknown-elf\riscv32-unknown-elf\lib\rv32i\ilp32/libm.a -LF:\Silice\Toolchains\riscv32-unknown-elf\riscv32-unknown-elf\lib\rv32i\ilp32/libg.a -LF:\Silice\Toolchains\riscv32-unknown-elf\newlib-nano\lib\gcc\riscv32-unknown-elf\11.3.0\rv32i\ilp32/libgcc.a -lm -S test.c -o test.s
Generated ASM (or ELF) file again contains "call" to MATH functions.
I create GCC toolchain with crosstool-ng in Ubuntu for use in Windows x64.
Any idea?
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sylefeb
commented on June 3, 2024
I could not test beyond compilation yet but this seems to work (*) on my side:
https://gist.github.com/sylefeb/64a0a55681f0680908989724c05e1778
(*) (edit: added this note) by 'seems to work' I mean I could compile code using float on an rv32i setup.
Might need a change in paths, for libgcc in particular as it contains a version number (note: the order of object file / libraries does matter in the ld command line).
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sylefeb
commented on June 3, 2024
It works! I was able to run the following on the ice-v (with the scripts I linked above and a small change to the .ld, see comment in the gist:
#include "config.h"
#include <math.h>
void main()
{
float f = 1.111111f;
for (int i = 0 ; i < 20 ; ++i) {
f = f * f;
*LEDS = (int)round(f);
}
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ShervinShokouhi
commented on June 3, 2024
I also compiled it :)
Thank you @sylefeb
But I have some problem with test it in my custom SOC.
I'll write about results
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ShervinShokouhi
commented on June 3, 2024
Another question: Now generated HEX file contains several sections split by something like "@000001E0", how do you fill them into BRAM for CPU?
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sylefeb
commented on June 3, 2024
Hex file: I have updated the preprocessor script to do that: https://github.com/sylefeb/Silice/blob/draft/projects/ice-v/SOCs/pre_include_compiled.lua (could use a rewrite but does the job ;) ).
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