Re: [Lightning] Lightning arm port

[Ludovic Courtès]

Hi Paulo,

Paulo César Pereira de Andrade
<address@hidden> skribis:

>   Out of interest of learning more about arm, I made a simple arm
> port of lightning, see https://github.com/pcpa/lightning

Woow, excellent!  :-)

>   It has been developed and tested only in qemu, but it pass all
> the tests I added to the contrib/check subdirectory in my for in
> github.

I tested on my GuruPlug, which is armv5tel-unknown-linux-gnueabi (had to
run autoreconf in ‘contrib/check’ because of a dangling ‘install-sh’
link; also ‘config.guess’ in your repo is from 2004 and doesn’t know
about ‘gnueabi’, so I’d recommend not putting it under version control
and instead using the one that comes with the latest Autoconf.)

There are some test failures under tests/, and contrib/checks/ appears
to have environment problems:

--8<---------------cut here---------------start------------->8---
make  check-TESTS
make[2]: Entering directory `/mnt/disk/2/src/lightning-arm/+build/tests'
1d0
< nfibs(32) = 7049155
FAIL: fib
PASS: fibit
PASS: fibdelay
PASS: incr
1d0
< looks like 1024 bytes sufficed
FAIL: printf
PASS: printf2
PASS: rpn
PASS: add
PASS: bp
2,10c2,10
< nans          0 2 2 1 2
< trunc         -2 -2 0 2 2
< trunc         -3 -2 0 2 3
< ceil          -2 -2 0 3 3
< ceil          -3 -2 0 2 3
< floor         -3 -3 0 2 2
< floor         -3 -2 0 2 3
< round         -3 -2 0 2 3
< round         -3 -2 0 2 3
---
> nans          0 1 -1 0 -1
> trunc         -1 -1 0 1 1
> trunc         -1 -1 0 1 1
> ceil          -1 -1 0 1 1
> ceil          -1 -1 0 1 1
> floor         -1 -1 0 1 1
> floor         -1 -1 0 1 1
> round         90111 -1 -1 0 0
> round         90111 -1 -1 0 0
FAIL: testfp
1d0
< result is 171.15       17.25
FAIL: funcfp
PASS: rpnfp
PASS: modi
PASS: ldxi
PASS: divi
PASS: movi
1c1
< succeeded
---
> failed: got -1 instead of 7777
FAIL: ret
1,2d0
< received 7777
< succeeded
FAIL: allocai
1,2d0
< we got 7777
< succeeded
FAIL: push-pop
PASS: sete
5c5
< 0 0
---
> 0 1
9,20c9
< 0 0
< 1 1
< 1 1
< 0 0
< 1 1
< 1 1
< 1 1
< 0 0
< 1 1
< 1 1
< 1 1
< 0 0
---
> 0 1
22a12,22
> 0 4
> 1 4
> 1 48
> 1 48
> 0 48
> 1 48
> 1 48
> 1 48
> 0 48
> 1 48
> 1 48
FAIL: 3to2
0a1,31
> SIGSEGV: __builtin_return_address(0) = 0x4017ed40 - info->si_addr = 0x10
> stxi...
> movxi...
> xi_c...
> xi_uc...
> xi_s...
> xi_us...
> xi_i...
> xi_ui...
> xi_f...
> xi_d...
> stxr...
> movxr...
> xr_c...
> xr_uc...
> xr_s...
> xr_us...
> xr_i...
> xr_ui...
> xr_f...
> xr_d...
> str...
> movr...
> x_c...
> x_uc...
> x_s...
> x_us...
> x_i...
> x_ui...
> x_f...
> x_d...
FAIL: ldst
================================
9 of 22 tests failed
Please report to address@hidden
================================
make[2]: *** [check-TESTS] Error 1
make[2]: Leaving directory `/mnt/disk/2/src/lightning-arm/+build/tests'
make[1]: *** [check-am] Error 2
make[1]: Target `check' not remade because of errors.
make[1]: Leaving directory `/mnt/disk/2/src/lightning-arm/+build/tests'
Making check in contrib/check
make[1]: Entering directory `/mnt/disk/2/src/lightning-arm/+build/contrib/check'
make  lightning
make[2]: Entering directory `/mnt/disk/2/src/lightning-arm/+build/contrib/check'
gcc -DPACKAGE_NAME=\"check\" -DPACKAGE_TARNAME=\"check\" 
-DPACKAGE_VERSION=\"0.0.1\" -DPACKAGE_STRING=\"check\ 0.0.1\" 
-DPACKAGE_BUGREPORT=\"address@hidden" -DPACKAGE_URL=\"\" -DPACKAGE=\"check\" 
-DVERSION=\"0.0.1\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 
-DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 
-DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 
-DLT_OBJDIR=\".libs/\" -DHAVE_LIBIBERTY=1 -DHAVE_LIBBFD=1 -DHAVE_LIBOPCODES=1 
-I. -I../../../contrib/check  -I../../../contrib/check/../.. 
-I../../../contrib/check/../../lightning 
-I../../../contrib/check/../../lightning/  -Wall -Wbad-function-cast 
-Wdeclaration-after-statement -Wmissing-prototypes -Wmissing-declarations 
-Wnested-externs -fno-strict-aliasing -Wold-style-definition -Wpointer-arith 
-Wstrict-prototypes -DDEBUG=1 -D_ASM_SAFETY=1 -DDISASSEMBLER=1 -DDYNAMIC=1 
-DPREPROCESSOR=1 -std=c99 -pthread -fvisibility=hidden -D_GNU_SOURCE=1 -g -O2 
-MT lightning.o -MD -MP -MF .deps/lightning.Tpo -c -o lightning.o 
../../../contrib/check/lightning.c
In file included from ../../../contrib/check/lightning.c:23:0:
../../../contrib/check/../../lightning.h:248:27: fatal error: lightning/asm.h: 
No such file or directory
compilation terminated.
make[2]: *** [lightning.o] Error 1
make[2]: Target `lightning' not remade because of errors.
make[2]: Leaving directory `/mnt/disk/2/src/lightning-arm/+build/contrib/check'
make[1]: *** [check-am] Error 2
make[1]: Target `check' not remade because of errors.
make[1]: Leaving directory `/mnt/disk/2/src/lightning-arm/+build/contrib/check'
make: *** [check-recursive] Error 1
make: Target `check' not remade because of errors.
--8<---------------cut here---------------end--------------->8---

Note that the GCC Compile Farm has a few ARM boxes (SheevaPlugs or
similar.)

>   Some generic arm details:
>
> o arm has 16 registers
> o registers 0-3 are used to pass arguments, extra arguments on stack
> o registers 0-3 are also used for return values
> o registers 4-9 are callee saved registers
> o registers 10,11,13,14 are special purpose, stack/base pointer,
>   link register, etc
> o register 15 is the program counter
> o register 12 is the only truly scratch register
> o float/double arguments are passed and returned in registers 0-3
> o arguments are not packed, so, like in the mips port, it is
>   not easy to follow lightning specification of pushing argument
>   right to left...

Which ABI does this follow?

Thanks,
Ludo’.