Geekmaster's adventures in K1 spelunking

[knc1]

The build process should have left the (hidden) .config file around for uClibc -
see if the options where set to build the software floating point routines (they should be provided by uClibc, not by gcc).
Those options might have been disabled (since everything else in the world has floating point hardware - except your Marvell chip (isn't that a comic book publisher?) )

[geekmaster]

Originally Posted by knc1

The build process should have left the (hidden) .config file around for uClibc -
see if the options where set to build the software floating point routines (they should be provided by uClibc, not by gcc).
Those options might have been disabled (since everything else in the world has floating point hardware - except your Marvell chip (isn't that a comic book publisher?) )

Static links bind to tcclib.a, which is apparently lacking in floatful pointlessness...

PHP Code:

(armv4l:1) /home/tcc-0.9.26 $ ls examples
ex1.c ex2.c ex3.c ex4.c ex5.c

(armv4l:1) /home/tcc-0.9.26 $ ./tcc -o ex1 examples/ex1.c
examples/ex1.c:2: error: include file 'tcclib.h' not found

(armv4l:1) /home/tcc-0.9.26 $ ./tcc -Iinclude -o ex1 examples/ex1.c

(armv4l:1) /home/tcc-0.9.26 $ ./ex1
Hello World

(armv4l:1) /home/tcc-0.9.26 $ ./tcc -static -Iinclude -o ex1 examples/ex1.c
tcc: error: undefined symbol '__udivsi3'
tcc: error: undefined symbol '__umodsi3'
tcc: error: undefined symbol '__nedf2'
tcc: error: undefined symbol '__eqdf2'
tcc: error: undefined symbol '__divdf3'
tcc: error: undefined symbol '__ltdf2'
tcc: error: undefined symbol '__muldf3'
tcc: error: undefined symbol '__gedf2'
tcc: error: undefined symbol '__fixunsdfsi'
tcc: error: undefined symbol '__floatunsidf'
tcc: error: undefined symbol '__subdf3'
tcc: error: undefined symbol '__modsi3'
tcc: error: undefined symbol '__divsi3'

(armv4l:1) /home/tcc-0.9.26 $ 


Okay, missing integer finctions too.. It was that "float" that caught my eye...

I looked up the missing "__udivsi3", and it says (for this and other related functions): "The integer arithmetic routines are used on platforms that don't provide hardware support for arithmetic operations on some modes." But that description was for libgcc, and we should have that (because we have gcc), I think. No build errors making tcc anyway...

We know that float is missing, but I also recall reading that integer division is missing too (and likewise on many newer arm processors as well).

EDIT: More googling for those missing symbools PLUS uclibc finds complaints of "stripped down" libraries, but a common solution is to all "-lm" to link in the math library. Two problems there though -- that is the FIRST thing I tried (unsuccessfully), and what math functions does a "Hello World" app need anyway? Well, apparently it needs ALL those missing functions, but why? And google chrome still locks me out of large parts of uclibc.org (bad certificate), so I need to use a different browser to visit uclibc.org.

[geekmaster]

Originally Posted by knc1

I don't recall if Java pre-dates ARMv4 or not, I think it does.
Maybe a little searching for ARMv4JT<...> would help answer that question. (I think Jazerle (sp?) implies thumb also)

Java 1.0 was released in 1996. The PXA255 came into existence in 2003. The ARM "Jazelle" native Java bytecode execution began with the ARMv5TEJ, but the PXA255 is missing the 'J'. That means a Java bytecode interpreter for the K1 would need to be run in software, and such things are available even on the lowliest of processors (like Arduino).

[knc1]

Try including libm in the link ( -lm ) - those names look like libm names (IIRC - I didn't look before I posted).

[geekmaster]

Originally Posted by knc1

Try including libm in the link ( -lm ) - those names look like libm names (IIRC - I didn't look before I posted).

As I mentioned previously, that was the FIRST thing I tried. But just to be sure, I did it again:

PHP Code:

(armv4l:1) /home/tcc-0.9.26 $ ./tcc -static -lm -Iinclude -o ex1 examples/ex1.c
tcc: error: undefined symbol '__udivsi3'
tcc: error: undefined symbol '__umodsi3'
tcc: error: undefined symbol '__nedf2'
tcc: error: undefined symbol '__eqdf2'
tcc: error: undefined symbol '__divdf3'
tcc: error: undefined symbol '__ltdf2'
tcc: error: undefined symbol '__muldf3'
tcc: error: undefined symbol '__gedf2'
tcc: error: undefined symbol '__fixunsdfsi'
tcc: error: undefined symbol '__floatunsidf'
tcc: error: undefined symbol '__subdf3'
tcc: error: undefined symbol '__modsi3'
tcc: error: undefined symbol '__divsi3'

(armv4l:1) /home/tcc-0.9.26 $ 


Again, it builds and runs apps just fine (but not on the K1) if I leave out the "-static" (and no need for "-lm" either)...

[knc1]

Your posts are so verbose, I have trouble extracting the information.

The 'key' to reading those symbols (usually is, but Eric might think differently)
one '_' library internal,
two '__' library internal, access by one (of possibly multiple) "#define" or "#typedef" statements.

= = = =

If you attached a copy of the .config Aboriginal used to build your copy of the uClibc library - I missed it.

[geekmaster]

Originally Posted by knc1

Your posts are so verbose, I have trouble extracting the information.

The 'key' to reading those symbols (usually is, but Eric might think differently)
one '_' library internal,
two '__' library internal, access by one (of possibly multiple) "#define" or "#typedef" statements.

= = = =

If you attached a copy of the .config Aboriginal used to build your copy of the uClibc library - I missed it.

I am using the downloaded binaries, but here is a link to the config on github:
https://github.com/landley/aborigina.../master/config

And the uClibc baseconfig:
https://github.com/landley/aborigina...econfig-uClibc

However, recent builds of aboriginal linux are musl-based rather than uclibc-based, and the armv4l I am using is an unconverted uclibc version. There is an archive of old aboriginal versions at landley.net. I do NOT know what config was used to build my working arm4vl version.

[geekmaster]

I loaded up my arm4vl build environment (which boots its own kernel), and did "find /|grep config" inside it, which found these:

PHP Code:

-rw-r--r--  1 root root  2213 2016-01-11 18:49 config-busybox
-rw-r--r--  1 root root 38538 2016-01-11 18:50 config-linux
-rw-r--r--  1 root root  6086 2016-01-11 18:50 config-uClibc 


config-uClibc:

PHP Code:

#
# Automatically generated make config: don't edit
# Version: 0.9.33.2
# Mon Jan 11 12:50:29 2016
#
# TARGET_alpha is not set
TARGET_arm=y
# TARGET_avr32 is not set
# TARGET_bfin is not set
# TARGET_c6x is not set
# TARGET_cris is not set
# TARGET_e1 is not set
# TARGET_frv is not set
# TARGET_h8300 is not set
# TARGET_hppa is not set
# TARGET_i386 is not set
# TARGET_i960 is not set
# TARGET_ia64 is not set
# TARGET_m68k is not set
# TARGET_microblaze is not set
# TARGET_mips is not set
# TARGET_nios is not set
# TARGET_nios2 is not set
# TARGET_powerpc is not set
# TARGET_sh is not set
# TARGET_sh64 is not set
# TARGET_sparc is not set
# TARGET_v850 is not set
# TARGET_vax is not set
# TARGET_x86_64 is not set
# TARGET_xtensa is not set

#
# Target Architecture Features and Options
#
TARGET_ARCH="arm"
FORCE_OPTIONS_FOR_ARCH=y
# CONFIG_ARM_EABI is not set
# COMPILE_IN_THUMB_MODE is not set
# USE_BX is not set
TARGET_SUBARCH=""

#
# Using ELF file format
#
ARCH_ANY_ENDIAN=y
ARCH_LITTLE_ENDIAN=y
# ARCH_WANTS_BIG_ENDIAN is not set
ARCH_WANTS_LITTLE_ENDIAN=y
ARCH_USE_MMU=y
UCLIBC_HAS_FLOATS=y
# UCLIBC_HAS_FPU is not set
UCLIBC_HAS_SOFT_FLOAT=y
DO_C99_MATH=y
# DO_XSI_MATH is not set
UCLIBC_HAS_FENV=y
KERNEL_HEADERS="/usr/include"
HAVE_DOT_CONFIG=y

#
# General Library Settings
#
# DOPIC is not set
HAVE_SHARED=y
# FORCE_SHAREABLE_TEXT_SEGMENTS is not set
# LDSO_LDD_SUPPORT is not set
LDSO_CACHE_SUPPORT=y
# LDSO_PRELOAD_ENV_SUPPORT is not set
# LDSO_PRELOAD_FILE_SUPPORT is not set
LDSO_BASE_FILENAME="ld-uClibc.so"
# LDSO_STANDALONE_SUPPORT is not set
# LDSO_PRELINK_SUPPORT is not set
UCLIBC_STATIC_LDCONFIG=y
LDSO_RUNPATH=y
LDSO_SEARCH_INTERP_PATH=y
LDSO_LD_LIBRARY_PATH=y
# LDSO_NO_CLEANUP is not set
UCLIBC_CTOR_DTOR=y
# LDSO_GNU_HASH_SUPPORT is not set
# HAS_NO_THREADS is not set
LINUXTHREADS_OLD=y
# LINUXTHREADS_NEW is not set
# UCLIBC_HAS_THREADS_NATIVE is not set
UCLIBC_HAS_THREADS=y
# PTHREADS_DEBUG_SUPPORT is not set
UCLIBC_HAS_SYSLOG=y
UCLIBC_HAS_LFS=y
# MALLOC is not set
# MALLOC_SIMPLE is not set
MALLOC_STANDARD=y
MALLOC_GLIBC_COMPAT=y
UCLIBC_DYNAMIC_ATEXIT=y
# COMPAT_ATEXIT is not set
UCLIBC_SUSV3_LEGACY=y
UCLIBC_SUSV3_LEGACY_MACROS=y
UCLIBC_SUSV4_LEGACY=y
# UCLIBC_STRICT_HEADERS is not set
# UCLIBC_HAS_STUBS is not set
UCLIBC_HAS_SHADOW=y
UCLIBC_HAS_PROGRAM_INVOCATION_NAME=y
UCLIBC_HAS___PROGNAME=y
UCLIBC_HAS_PTY=y
ASSUME_DEVPTS=y
UNIX98PTY_ONLY=y
UCLIBC_HAS_GETPT=y
UCLIBC_HAS_LIBUTIL=y
UCLIBC_HAS_TM_EXTENSIONS=y
UCLIBC_HAS_TZ_CACHING=y
UCLIBC_HAS_TZ_FILE=y
UCLIBC_HAS_TZ_FILE_READ_MANY=y
UCLIBC_TZ_FILE_PATH="/etc/TZ"
# UCLIBC_FALLBACK_TO_ETC_LOCALTIME is not set

#
# Advanced Library Settings
#
UCLIBC_PWD_BUFFER_SIZE=256
UCLIBC_GRP_BUFFER_SIZE=256

#
# Support various families of functions
#
UCLIBC_LINUX_MODULE_26=y
# UCLIBC_LINUX_MODULE_24 is not set
UCLIBC_LINUX_SPECIFIC=y
UCLIBC_HAS_GNU_ERROR=y
UCLIBC_BSD_SPECIFIC=y
UCLIBC_HAS_BSD_ERR=y
UCLIBC_HAS_OBSOLETE_BSD_SIGNAL=y
UCLIBC_HAS_OBSOLETE_SYSV_SIGNAL=y
UCLIBC_NTP_LEGACY=y
UCLIBC_SV4_DEPRECATED=y
UCLIBC_HAS_REALTIME=y
UCLIBC_HAS_ADVANCED_REALTIME=y
UCLIBC_HAS_EPOLL=y
UCLIBC_HAS_XATTR=y
UCLIBC_HAS_PROFILING=y
UCLIBC_HAS_CRYPT_IMPL=y
# UCLIBC_HAS_SHA256_CRYPT_IMPL is not set
# UCLIBC_HAS_SHA512_CRYPT_IMPL is not set
UCLIBC_HAS_CRYPT=y
UCLIBC_HAS_NETWORK_SUPPORT=y
UCLIBC_HAS_SOCKET=y
UCLIBC_HAS_IPV4=y
UCLIBC_HAS_IPV6=y
UCLIBC_HAS_RPC=y
UCLIBC_HAS_FULL_RPC=y
UCLIBC_HAS_REENTRANT_RPC=y
# UCLIBC_USE_NETLINK is not set
# UCLIBC_HAS_BSD_RES_CLOSE is not set
UCLIBC_HAS_COMPAT_RES_STATE=y
# UCLIBC_HAS_EXTRA_COMPAT_RES_STATE is not set
UCLIBC_HAS_RESOLVER_SUPPORT=y
UCLIBC_HAS_LIBRESOLV_STUB=y
UCLIBC_HAS_LIBNSL_STUB=y

#
# String and Stdio Support
#
UCLIBC_HAS_STRING_GENERIC_OPT=y
UCLIBC_HAS_STRING_ARCH_OPT=y
UCLIBC_HAS_CTYPE_TABLES=y
UCLIBC_HAS_CTYPE_SIGNED=y
UCLIBC_HAS_CTYPE_UNSAFE=y
# UCLIBC_HAS_CTYPE_CHECKED is not set
# UCLIBC_HAS_CTYPE_ENFORCED is not set
UCLIBC_HAS_WCHAR=y
# UCLIBC_HAS_LOCALE is not set
# UCLIBC_HAS_HEXADECIMAL_FLOATS is not set
UCLIBC_HAS_GLIBC_CUSTOM_PRINTF=y
UCLIBC_PRINTF_SCANF_POSITIONAL_ARGS=9
# UCLIBC_HAS_SCANF_GLIBC_A_FLAG is not set
# UCLIBC_HAS_STDIO_BUFSIZ_NONE is not set
# UCLIBC_HAS_STDIO_BUFSIZ_256 is not set
# UCLIBC_HAS_STDIO_BUFSIZ_512 is not set
# UCLIBC_HAS_STDIO_BUFSIZ_1024 is not set
# UCLIBC_HAS_STDIO_BUFSIZ_2048 is not set
UCLIBC_HAS_STDIO_BUFSIZ_4096=y
# UCLIBC_HAS_STDIO_BUFSIZ_8192 is not set
UCLIBC_HAS_STDIO_BUILTIN_BUFFER_NONE=y
# UCLIBC_HAS_STDIO_BUILTIN_BUFFER_4 is not set
# UCLIBC_HAS_STDIO_BUILTIN_BUFFER_8 is not set
# UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT is not set
UCLIBC_HAS_STDIO_GETC_MACRO=y
UCLIBC_HAS_STDIO_PUTC_MACRO=y
UCLIBC_HAS_STDIO_AUTO_RW_TRANSITION=y
# UCLIBC_HAS_FOPEN_LARGEFILE_MODE is not set
# UCLIBC_HAS_FOPEN_EXCLUSIVE_MODE is not set
# UCLIBC_HAS_FOPEN_CLOSEEXEC_MODE is not set
# UCLIBC_HAS_GLIBC_CUSTOM_STREAMS is not set
UCLIBC_HAS_PRINTF_M_SPEC=y
UCLIBC_HAS_ERRNO_MESSAGES=y
# UCLIBC_HAS_SYS_ERRLIST is not set
UCLIBC_HAS_SIGNUM_MESSAGES=y
# UCLIBC_HAS_SYS_SIGLIST is not set
UCLIBC_HAS_GNU_GETOPT=y
UCLIBC_HAS_GNU_GETSUBOPT=y

#
# Big and Tall
#
UCLIBC_HAS_REGEX=y
UCLIBC_HAS_REGEX_OLD=y
UCLIBC_HAS_FNMATCH=y
UCLIBC_HAS_FNMATCH_OLD=y
# UCLIBC_HAS_WORDEXP is not set
UCLIBC_HAS_NFTW=y
UCLIBC_HAS_FTW=y
# UCLIBC_HAS_FTS is not set
UCLIBC_HAS_GLOB=y
UCLIBC_HAS_GNU_GLOB=y
UCLIBC_HAS_UTMPX=y

#
# Library Installation Options
#
RUNTIME_PREFIX="/usr/$(TARGET_ARCH)-linux-uclibc/"
DEVEL_PREFIX="/usr/$(TARGET_ARCH)-linux-uclibc/usr/"
MULTILIB_DIR="lib"
# HARDWIRED_ABSPATH is not set

#
# Security options
#
# UCLIBC_BUILD_PIE is not set
# UCLIBC_HAS_ARC4RANDOM is not set
# UCLIBC_HAS_SSP is not set
UCLIBC_BUILD_RELRO=y
# UCLIBC_BUILD_NOW is not set
UCLIBC_BUILD_NOEXECSTACK=y

#
# Development/debugging options
#
CROSS_COMPILER_PREFIX=""
UCLIBC_EXTRA_CFLAGS=""
# DODEBUG is not set
# DODEBUG_PT is not set
# DOSTRIP is not set
# DOASSERTS is not set
# SUPPORT_LD_DEBUG is not set
# SUPPORT_LD_DEBUG_EARLY is not set
# UCLIBC_MALLOC_DEBUGGING is not set
# UCLIBC_HAS_BACKTRACE is not set
WARNINGS="-Wall"
# EXTRA_WARNINGS is not set
# DOMULTI is not set
# UCLIBC_MJN3_ONLY is not set 


Hmm...
"UCLIBC_HAS_FLOATS=y"
Is that correct for a K1?

I suppose I could change that line in the "DO NOT EDIT" file to "UCLIBC_HAS_FLOATS=n" and recompile, eh? Or instead perhaps "# UCLIBC_HAS_FLOATS is not set" like the others? Probably none of the above, perhaps run configure with cmd line switches or env vars instead? I am a configure newbie... I wonder how to rebuild it, and what errors I will encounter along the way... I think it was cmd line switches when I configured tinycc, so probably the same here. "configure -h" should say what is available. Probably build from that github source code, and cross my fingers...

[knc1]

None of the above - floats look properly supported

But notice the ...si... in the missing symbol names?
and the
# DO_XSI_MATH is not set

change that one (with the uClibc menuconfig utility) and re-build the library.

[geekmaster]

Originally Posted by knc1

None of the above - floats look properly supported

But notice the ...si... in the missing symbol names?
and the
# DO_XSI_MATH is not set

change that one (with the uClibc menuconfig utility) and re-build the library.

Just spent hours at landley.net. Got sidetracked from uClibc config into reams of his posts describing political drama in his projects. He seems to hate uClibc with a passion, probably why his recent switch to musl. Though quite fascinating, such historical reading detracts from "getting sh*t done". Now back to configging the errors out of my build process...

[knc1]

Check out his opinion on GPLv3.

[geekmaster]

Originally Posted by knc1

Check out his opinion on GPLv3.

As you wish...

Originally Posted by Rob Landley

- GPLv3 broke "the" GPL into incompatible forks that can't share code.
- Linux and Samba can't share code, implement 2 ends of same protocol.
- QEMU caught between GPLv2 Linux drivers and GPLv3 binutils/gdb processor instruction set descriptions. Can't take code from both.
- "GPLv2 or later" give to both but can't take code from _either_one_.
- FSF expected universal compliance, but hijacked lifeboat clause when boat wasn't sinking. GPLv2 not rendered unenforceable, they just pulled a Darth Vader "I am altering the bargain, pray I don't alter it any further." And then shipped The Phantom Meanance.
- This has poisoned copyleft. GPL use declining. Multiple GPLv3 successor projects

(http://xkcd.com/927).

- The one thing GPLv3 achieved was undermining GPLv2.
- fragmentation only increasing

http://www.freerepublic.com/focus/f-chat/2905643/posts
https://lwn.net/Articles/538839/

...
- aboriginal linux (Ab Origine: latin, "from the beginning") ...
- A linux that even the FSF can't stick a GNU/ on the front of.

"Phantom Meanance" sounds like a sniglet for "Menace, Meanness, and Maintenance". Phantom Maintenance sounds like how he described the slow death of uClinux:

Originally Posted by Rob Landley

uClinux ... Seriously, there's a lot of crap in there. It's hard to analyze most of it far enough to prove it _doesn't_ do anything. ... The uClinux project can rest in peace.

And of course, an embedded version of the XKCD he linked to above:

[geekmaster]

I am building aboriginal from current github source tree, for armv4l target. I see that it was just downloading musl, so I am curious (though doubtful) that it will work on my K1, considering that NiLuJe's musl test builds failed on my K1. I guess we shall see.

I suppose I need to go find OLD source that was still uClibc-based, from the landley.net download archives...

[donB006]

Originally Posted by geekmaster

I am building aboriginal from current github source tree, for armv4l target. I see that it was just downloading musl, so I am curious (though doubtful) that it will work on my K1, considering that NiLuJe's musl test builds failed on my K1. I guess we shall see.

I suppose I need to go find OLD source that was still uClibc-based, from the landley.net download archives...

Why worry about the musl or the libc included with aboriginal linux as long as you don't link with those libraries? Just link with uClibc not musl. I think aboriginal gives you a choice and you should choose uClibc.

DId you get the K1 rootfs image unsquashed? Did you find the remaining files in /usr/default someplace and get those added to your K1 copy for a complete system? That should allow you to chroot into the virtual K1 and run your actual K1 programs except with the modern kernel imitating a K1 kernel. That is as far as I got.

I was going to install the header files from Amazon sources for the K1 for the 2.6.10 kernel and the headers for the uClibc into the K1 copy. Those are needed to make programs compatible with the K1. I quit at that point to do other things.

The only big problem would be to install the correct gcc into the K1 filesystem copy. Programs compatible with the K1 could then be built with the virtual K1. The gcc could then use the original K1 uclibc.so to build a dynamic executable as long as gcc is told to link with the uclibc.so and the programs include the correct headers. That should work unless there are compatibility problems between gcc versions. That potential problem could be solved by using the virtual K1 gcc to build a correct K1 gcc able to run on the K1 not just the emulator. The resulting programs should then run perfectly on the K1. I never got that far.

Having a correct build setup should make those other problems go away. I am too busy now and for the summer to ever finish so so long.

[knc1]

Originally Posted by geekmaster

- - - -
I suppose I need to go find OLD source that was still uClibc-based, from the landley.net download archives...

Or just revert the uClibc -> musl commit.
It looks rather simple to revert.