Closed mfld-fr closed 4 years ago
ghaerr
commented
4 years ago warning: cannot read from console:: Resource temporarily unavailable
I'll fix this, but don't have access to my debian box until Tuesday.
It appears this issue is related to user limits, although I'm unable to guess what it might be... Can you run "ulimit -aH" or "prlimit" to see what resource is being restricted?
mfld-fr
commented
4 years ago ulimit:
mfld@home /mnt/data/home/mfld/advantech/emu86 $ ulimit -aH
core file size (blocks, -c) unlimited
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 63852
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 4096
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) unlimited
cpu time (seconds, -t) unlimited
max user processes (-u) 63852
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimitedprlimit:
mfld@home /mnt/data/home/mfld/advantech/emu86 $ prlimit
RESOURCE DESCRIPTION SOFT HARD UNITS
AS address space limit sans limite sans limite octets
CORE max core file size 0 sans limite octets
CPU CPU time sans limite sans limite secondes
DATA max data size sans limite sans limite octets
FSIZE max file size sans limite sans limite octets
LOCKS max number of file locks held sans limite sans limite verrous
MEMLOCK max locked-in-memory address space 65536 65536 octets
MSGQUEUE max bytes in POSIX mqueues 819200 819200 octets
NICE max nice prio allowed to raise 0 0
NOFILE max number of open files 1024 4096 fichiers
NPROC max number of processes 63852 63852 processus
RSS max resident set size sans limite sans limite octets
RTPRIO max real-time priority 0 0
RTTIME timeout for real-time tasks sans limite sans limite microsecondes
SIGPENDING max number of pending signals 63852 63852 signaux
STACK max stack size 8388608 sans limite octetsulimit / prlimit
Thanks @mfld-fr. I've tracked this down to something to do with Linux's special handling of stdin when set to non-blocking mode, which is different between the console and pty drivers. More coming when I can fully reproduce on Linux vs macOS.
mfld-fr
commented
4 years ago @ghaerr : OK, thanks, let us wait for your test on your Linux box...
ghaerr
commented
4 years ago @mfld-fr :
I just tested on two emulated Linux VMs, Ubuntu 18.10 running kernel 4.18.0-16 and Debian 9.9. Both versions did not reproduce this error. I presume this error is occurring immediately after loading with the arguments you've specified, NOT after a ^C, correct?
Can you give me the version of Gentoo you are running on, I may have to download that specific version.
A discussion on the possible reasons for this error are here https://github.com/fish-shell/fish-shell/issues/176#issuecomment-15807928, although the issue could be to do with the shell, as discussed in detail here https://www.cons.org/cracauer/sigint.html.
In the meantime, I've discovered two more problems associated with the console driver:
I will submit a PR for these two problems.
ghaerr
commented
4 years ago @mfld-fr : I downloaded the base Gentoo from their main site and setup a VM, to try to reproduce this ug. The system doesn't come with a compiler. Can you give me the kernel version of your Gentoo system? Did you download a full system from somewhere, or have you built up your Gentoo from scratch?
mfld-fr
commented
4 years ago I build my Gentoo system following the instructions of the manual : https://wiki.gentoo.org/wiki/Handbook:Main_Page
Here is the detailled configuration:
mfld@home ~ $ emerge --info
Portage 2.3.103 (python 3.7.8-final-0, default/linux/amd64/17.1/desktop, gcc-9.3.0, glibc-2.30-r8, 5.4.38-gentoo-x86_64 x86_64)
=================================================================
System uname: Linux-5.4.38-gentoo-x86_64-x86_64-Intel-R-_Core-TM-_i3-9100F_CPU_@_3.60GHz-with-gentoo-2.6
KiB Mem: 16349368 total, 9610784 free
KiB Swap: 4194300 total, 4194300 free
Timestamp of repository gentoo: Fri, 31 Jul 2020 18:45:01 +0000
Head commit of repository gentoo: 3727fcce65581b0fb086ad4cdd5a4d711d869fbc
sh bash 5.0_p17
ld GNU ld (Gentoo 2.33.1 p2) 2.33.1
app-shells/bash: 5.0_p17::gentoo
dev-java/java-config: 2.3.1::gentoo
dev-lang/perl: 5.30.3::gentoo
dev-lang/python: 2.7.18-r1::gentoo, 3.7.8-r2::gentoo, 3.8.4-r1::gentoo
dev-util/cmake: 3.16.5::gentoo
dev-util/pkgconfig: 0.29.2::gentoo
sys-apps/baselayout: 2.6-r1::gentoo
sys-apps/openrc: 0.42.1::gentoo
sys-apps/sandbox: 2.18::gentoo
sys-devel/autoconf: 2.13-r1::gentoo, 2.69-r4::gentoo
sys-devel/automake: 1.16.1-r1::gentoo
sys-devel/binutils: 2.33.1-r1::gentoo
sys-devel/gcc: 9.3.0-r1::gentoo
sys-devel/gcc-config: 2.3.1::gentoo
sys-devel/libtool: 2.4.6-r6::gentoo
sys-devel/make: 4.2.1-r4::gentoo
sys-kernel/linux-headers: 5.4-r1::gentoo (virtual/os-headers)
sys-libs/glibc: 2.30-r8::gentoo
Repositories:
gentoo
location: /mnt/data/usr/portage
sync-type: rsync
sync-uri: rsync://host.mfld.fr/gentoo-portage
priority: -1000
sync-rsync-verify-max-age: 24
sync-rsync-verify-jobs: 1
sync-rsync-extra-opts:
sync-rsync-verify-metamanifest: no
local
location: /usr/local/portage
masters: gentoo
ACCEPT_KEYWORDS="amd64"
ACCEPT_LICENSE="* -@EULA"
CBUILD="x86_64-pc-linux-gnu"
CFLAGS="-march=core2 -O2 -pipe"
CHOST="x86_64-pc-linux-gnu"
CONFIG_PROTECT="/etc /usr/lib64/libreoffice/program/sofficerc /usr/share/gnupg/qualified.txt"
CONFIG_PROTECT_MASK="/etc/ca-certificates.conf /etc/dconf /etc/env.d /etc/fonts/fonts.conf /etc/gconf /etc/gentoo-release /etc/revdep-rebuild /etc/sandbox.d /etc/terminfo"
CXXFLAGS="-march=core2 -O2 -pipe"
DISTDIR="/usr/portage/distfiles"
ENV_UNSET="DBUS_SESSION_BUS_ADDRESS DISPLAY GOBIN GOPATH PERL5LIB PERL5OPT PERLPREFIX PERL_CORE PERL_MB_OPT PERL_MM_OPT XAUTHORITY XDG_CACHE_HOME XDG_CONFIG_HOME XDG_DATA_HOME XDG_RUNTIME_DIR"
FCFLAGS="-O2 -pipe"
FEATURES="assume-digests binpkg-docompress binpkg-dostrip binpkg-logs config-protect-if-modified distlocks ebuild-locks fixlafiles getbinpkg ipc-sandbox merge-sync multilib-strict network-sandbox news parallel-fetch pid-sandbox preserve-libs protect-owned qa-unresolved-soname-deps sandbox sfperms strict unknown-features-warn unmerge-logs unmerge-orphans userfetch userpriv usersandbox usersync xattr"
FFLAGS="-O2 -pipe"
GENTOO_MIRRORS="ftp://ftp.free.fr/mirrors/ftp.gentoo.org/"
LANG="fr_FR.utf8"
LDFLAGS="-Wl,-O1 -Wl,--as-needed"
LINGUAS="en fr"
MAKEOPTS="-j2"
PKGDIR="/usr/portage/packages"
PORTAGE_BINHOST="ftp://host.mfld.fr/"
PORTAGE_CONFIGROOT="/"
PORTAGE_RSYNC_OPTS="--recursive --links --safe-links --perms --times --omit-dir-times --compress --force --whole-file --delete --stats --human-readable --timeout=180 --exclude=/distfiles --exclude=/local --exclude=/packages --exclude=/.git"
PORTAGE_TMPDIR="/var/tmp"
USE="X a52 aac acl acpi alsa amd64 berkdb bindist branding bzip2 cairo cdda cdr cli crypt cups dbus dri dts dvd dvdr elogind encode exif flac fortran gdbm gif gimp gpm gtk iconv icu jpeg lcms libnotify libtirpc lm-sensors mad mng mp3 mp4 mpeg mtp multilib ncurses nls nptl ogg opengl openmp pam pango pcre pdf png policykit ppds pulseaudio qt5 readline scanner sdl seccomp spell split-usr ssl startup-notification svg tcpd theora tiff truetype udev udisks unicode upower usb v4l vorbis wxwidgets x264 xattr xcb xml xv xvid zlib" ABI_X86="64" ADA_TARGET="gnat_2018" ALSA_CARDS="hda-intel" APACHE2_MODULES="authn_core authz_core socache_shmcb unixd actions alias auth_basic authn_alias authn_anon authn_dbm authn_default authn_file authz_dbm authz_default authz_groupfile authz_host authz_owner authz_user autoindex cache cgi cgid dav dav_fs dav_lock deflate dir disk_cache env expires ext_filter file_cache filter headers include info log_config logio mem_cache mime mime_magic negotiation rewrite setenvif speling status unique_id userdir usertrack vhost_alias" CALLIGRA_FEATURES="karbon sheets words" COLLECTD_PLUGINS="df interface irq load memory rrdtool swap syslog" CPU_FLAGS_X86="mmx mmxext sse sse2 sse3 sse4_1 ssse3" ELIBC="glibc" GPSD_PROTOCOLS="ashtech aivdm earthmate evermore fv18 garmin garmintxt gpsclock greis isync itrax mtk3301 nmea ntrip navcom oceanserver oldstyle oncore rtcm104v2 rtcm104v3 sirf skytraq superstar2 timing tsip tripmate tnt ublox ubx" INPUT_DEVICES="evdev" KERNEL="linux" L10N="en fr" LCD_DEVICES="bayrad cfontz cfontz633 glk hd44780 lb216 lcdm001 mtxorb ncurses text" LIBREOFFICE_EXTENSIONS="presenter-console presenter-minimizer" OFFICE_IMPLEMENTATION="libreoffice" PHP_TARGETS="php7-2 php7-3" POSTGRES_TARGETS="postgres10 postgres11" PYTHON_SINGLE_TARGET="python3_7" PYTHON_TARGETS="python2_7 python3_7" RUBY_TARGETS="ruby25" SANE_BACKENDS="plustek" USERLAND="GNU" VIDEO_CARDS="amdgpu radeonsi" XTABLES_ADDONS="quota2 psd pknock lscan length2 ipv4options ipset ipp2p iface geoip fuzzy condition tee tarpit sysrq steal rawnat logmark ipmark dhcpmac delude chaos account"
Unset: CC, CPPFLAGS, CTARGET, CXX, EMERGE_DEFAULT_OPTS, INSTALL_MASK, LC_ALL, PORTAGE_BUNZIP2_COMMAND, PORTAGE_COMPRESS, PORTAGE_COMPRESS_FLAGS, PORTAGE_RSYNC_EXTRA_OPTS@mfld-fr :
mfld@home /mnt/data/home/mfld/advantech/mon86/target $ ../../emu86/emu86 -w 0x80000 -f ../../img/ADVTECH1.BIN -w 0xf8100 -f mon86.bin -c 0xf8100
info: load address 80000h
info: load file ../../img/ADVTECH1.BIN
info: file size=80000h
success: file loaded
info: load address F8100h
info: load file mon86.bin
info: file size=B2Ch
success: file loaded
info: code breakpoint address F8100h
warning: writing byte into ROM @ f0692h
warning: cannot read from console:: Resource temporarily unavailable
error: execute operation
0060:472A CD 16 int $0x16
>qI am pretty sure this error has nothing to do with Gentoo specifically, as I can't get it to reproduce on any system. This is because I don't (yet) have ADVTECH1.BIN nor mon86.bin to load. Instead, I think the problem has to do with the emulated MON86 code or the EMU86 BIOS emulation code calling a BIOS function that calls serial_recv, expecting the system to "wait" on a character. This will need some thinking and a slight redesign in order to implement on my console code.
Notice that you have a ">" prompt above, and 'q' was used to exit. This means the emu-console code is running properly. The error "warning: cannot read from console:: Resource temporarily unavailable" is very likely because, for the console driver (and unlike the PTY driver), a serial-poll() call must be used before calling serial_read(). This is because, for the new console driver, the console is in non-blocking mode, whereas in PTY, there is no need for such.
Thus, the "Resource temporarily unavailable" is actually essentially a -EWOULDBLOCK return. In this case, the fix entails testing for the specific errno return value occurring in your case, and returning -1 (or 0xFF, depending on your serial_recv() version), and continuing.
I am still studying MON86 but am sure it calls a function to wait on a character, which ends up calling serial_recv().
We need to (re)define the semantics of serial_poll and serial_recv, given this information. If we can determine the BIOS call that mon86 is making to the Advantech BIOS, I can duplicate this on my system, and then proceed to provide a fix where the system waits for a read, hopefully not by busy looping, to implement this functionality.
Apart from this, you should be able to test EMU86 with my console driver by running the emulator as above with -i, and start immediately single stepping, with the console operational. The error will occur when the system later calls serial_recv() without a character ready, as described.
Please advise, thanks!
mfld-fr
commented
4 years ago Fixed by #17
I tried for the first time the 'console' mode on commit 1e25716, and I got the following error on Gentoo Linux:
The same run works fine in 'pty' mode.