Tootfinder

2021 retro-link! https://blog.can.ac/2021/03/22/speculating-x86-64-isa-with-one-weird-trick/ - Speculating the entire x86-64 instruction set in seconds with this one weird trick.

As someone who's written code at one time or another in C, C , Verilog, SystemVerilog, VHDL, GLSL, PHP, JavaScript, Pascal, Oz, Java, Salsa, i386 assembly, PIC12 assembly, MIPS assembly, x86-64 assembly, ARM assembly, Prolog, Bash, VBScript, DOS batch files, FEI AutoScript, CMake, and even a few dozen lines of Python years back...
I can confidently say Rust is alien technology.
Maybe one day I'll grok it but today I feel like I sat down in front of a Klingon PC and tried…

The #kernel developers are wondering if anyone is still using the x32 user mode supported by x86-64 #Linux:
https://

🖥️ Why x86 Doesn’t Need to Die
#computing

Why x86 Doesn’t Need to Die
Hackaday recently published an article titled “Why x86 Needs to Die” – the latest addition in a long-running RISC vs CISC debate. Rather than x86 needing to die, I believe the RISC vs C…

actually blows my mind that compatibility layers and emulators have gotten so far that you can run x86 windows games on an android phone. i am running mudrunner at a solid 10fps on my poco f3 through winlator

🖥️ Why x86 Doesn’t Need to Die
#computing

Why x86 Doesn’t Need to Die
Hackaday recently published an article titled “Why x86 Needs to Die” – the latest addition in a long-running RISC vs CISC debate. Rather than x86 needing to die, I believe the RISC vs C…

This is very exciting. I hope by 6.10 we can expect best performance.
From: @…
https://linuxrocks.online/@Linux/112439888323047027…

Interesting detail in the description of the main EFI changes merged for #Linux 6.9[1]:
"'"Avoid creating mappings that are both writable and executable while running in the EFI boot services. This is a prerequisite for getting the x86 #shim loader signed by MicroSoft again, which allows …

In this episode of "C things I knew by feeling but not for sure":
A #cpp lambda is a class w overloaded function-call operator (), confirmed 3 different ways with the example in Pic 1:
1. Assembly has operator() function members for A, C, D
2. Can explicitly call function call operators on A, C, D
3. A passes the trait std::is_class but fails std::is_function
Pic…

Compiler Explorer - C++ (x86-64 gcc 13.2)
auto A = []() { std

getting closer to ubsan traps working on x86

Woohoo! My old ppscsi scanner scans:
# scanimage -d hp:/dev/sg3 -v -p --mode color -o /tmp/g.jpg
scanimage: scanning image of size 2550x3507 pixels at 24 bits/pixel
scanimage: acquiring RGB frame
scanimage: min/max graylevel value = 11/255
scanimage: read 26828550 bytes in total
# uname -a
Linux ood 6.5.0-28-generic #29~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Thu Apr 4 14:39:20 UTC 2 x86_64 x86_64 x86_64 GNU/Linux
And the scan, a 1946 radio amateur intr…

This https://arxiv.org/abs/2405.04355 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCR_…

SmmPack: Obfuscation for SMM Modules with TPM Sealed Key
System Management Mode (SMM) is the highest-privileged operating mode of x86 and x86-64 processors. Through SMM exploitation, attackers can tamper with the Unified Extensible Firmware Interface (UEFI) firmware, disabling the security mechanisms implemented by the operating system and hypervisor. Vulnerabilities enabling SMM code execution are often reported as Common Vulnerabilities and Exposures (CVEs); however, no security mechanisms currently exist to prevent attackers from analyzing those v…

2021 retro-link! https://github.com/mmcloughlin/avo - avo: Generate x86 assembly with Golang.

I keep writing SHR instead of LSR on my assignment
#assembly #x86 #arm

So, my Friday afternoon is spent troubleshooting a bug in a piece of software I have to use at work . The application puts working files in:
`C:\user\AppData\Roaming\app*`
`C:\user\AppData\Local\app*`
`C:\programdata\app*`
`C:\program files (x86)\app*`
This isn't at installation time, this is while it RUNs. logs. logs for plugins. .logs for user data. temp cache storage.
If you're a developer don't do this.
1/

@… Bug report:
OS: Fedora Linux 40.20240424.0 (Silverblue) x86_64
DE: GNOME 46.1 (Wayland)
Vivaldi Open dialogue after clicking Choose file on a file input: flickering tooltip.
CC @…

It's surreal how slowly time moves in the world of C compilers.
Today there are still active projects that are hesitant to move past C89, and C99 is still the "new" standard.
The C99 standard has been released before the first public Mac OS X and Windows XP. It's older Itanium and the x86-64 instruction set. It predates iPod, Game Cube, first ever Xbox, and Nokia 3310.
Entire platforms lived and died in the meantime, while C programmers still can't be …

@… it's not a crash of Firefox.
More likely: one of the underlying problems with FreeBSD support for audio hardware.
For Firefox: whilst I would like Tier-2, I have been very happy with the Tier-3 build target (FreeBSD/x86, x86-64, Aarch64 (clang) <

This https://arxiv.org/abs/2405.04355 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_csCR_…

SmmPack: Obfuscation for SMM Modules with TPM Sealed Key
System Management Mode (SMM) is the highest-privileged operating mode of x86 and x86-64 processors. Through SMM exploitation, attackers can tamper with the Unified Extensible Firmware Interface (UEFI) firmware, disabling the security mechanisms implemented by the operating system and hypervisor. Vulnerabilities enabling SMM code execution are often reported as Common Vulnerabilities and Exposures (CVEs); however, no security mechanisms currently exist to prevent attackers from analyzing those v…

Google plans to release a Chrome version optimized for Windows on Arm this week, two months after Canary testing; Arm PCs previously ran an emulated x64 version (Jon Porter/The Verge)
https://www.theverge.com/2024/3/26/24112273/chrome-n…

A native version of Chrome arrives for Arm-based Windows PCs
Google is releasing an optimized version of its Chrome browser for Windows on Arm, which should offer better performance than the current emulated x86 version.

This is fun.
Login to Ubuntu
Be told there is a really cool management tool named Landscape
Follow instructions for install
Instructions fail
Go to GitHub page for Landscape and find it has been depricated
Wheeeeeeee
=======================
Welcome to Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-102-generic x86_64)
* Documentation: #Linux #Ubuntu

Enhanced OpenMP Algorithm to Compute All-Pairs Shortest Path on x86 Architectures
Sergio Calder\'on, Enzo Rucci, Franco Chichizola
https://arxiv.org/abs/2403.18619

Enhanced OpenMP Algorithm to Compute All-Pairs Shortest Path on x86 Architectures
Graphs have become a key tool when modeling and solving problems in different areas. The Floyd-Warshall (FW) algorithm computes the shortest path between all pairs of vertices in a graph and is employed in areas like communication networking, traffic routing, bioinformatics, among others. However, FW is computationally and spatially expensive since it requires O(n^3) operations and O(n^2) memory space. As the graph gets larger, parallel computing becomes necessary to provide a solution in an ac…

Recovering my free oracle cloud (aarch) VM was a bit more hastle; I hadn't set a root password, so I couldn't login on the console; in the end I had to create a (free) x86 VM, swing the aarch boot device to a 2nd block device on the x86, set a root password in the aarch disc and delete the knackered systemd-networking config. Life would have been a lot easier if they'd just included a rescue image.

Looks like @… & gang just shipped cross-platform-ish lock files for uv!? https://github.com/astral-sh/uv/pull/3111

Add a `--platform` argument to enable resolving against a target platform by charliermarsh · Pull Request #3111 · astral-sh/uv
Summary I've wanted to try this for a long time, so decided to give it a shot. The basic idea is that you can provide a target triple (e.g., --platform x86_64-pc-windows-msvc) and resolve against t...

@… Bug report:
- OS: Fedora Linux 40.20240424.0 (Silverblue) x86_64
- DE: GNOME 46.1 (Wayland)
After signing in after sleep, Vivaldi renders at @1x even though my screen is set to @2x.
(Moving the window around or resizing it, etc., re-renders it at the correct resolution.)

Adventures in #NixOS rabbit hole continue
- Wanted to run GNOME 46
- Didn't want to build the world locally
- Bought a beefy x86 server and made it build staging-next branch
- Spun up Attic (https://docs.attic.rs/

It's surreal how slowly time moves in the world of C compilers.
Today there are still active projects that are hesitant to move past C89, and C99 is still the "new" standard.
The C99 standard has been released before the first public Mac OS X and Windows XP. It's older Itanium and the x86-64 instruction set. It predates iPod, Game Cube, first ever Xbox, and Nokia 3310.
Entire platforms lived and died in the meantime, while C programmers still can't be …

Felt just a bit sad about this news. The #Z80 was the second microprocessor that I ever coded #assembly on after the Intel x86. I remember burning an EPROM with a Z80 program that controlled the brightness level of an LED in one of my early practical microprocessor exercises in college.

The legendary Zilog Z80 CPU is being discontinued after nearly 50 years
The iconic IC device, developed by Federico Faggin, will soon be phased out, and interested parties only have a few months left to place their orders before...

#HTTP query method is coming #nodejs

Die Schere zwischen Arm und X86.
#raspberrypi #Raspberry #Udoo #ARM

Does anyone have scope/logic analyzer captures of Intel eSPI they can share?
I need to make some screenshots for the ngscopeclient manual and don't have either a) a spare new-enough x86 board I can put probes on that's not in production usage or b) any waveform captures that aren't $dayjob related.

🧮 Hermit is a hermetic and reproducible sandbox for running programs
#software

GitHub - facebookexperimental/hermit: Hermit launches linux x86_64 programs in a special, hermetically isolated sandbox to control their execution. Hermit translates normal, nondeterministic behavior, into deterministic, repeatable behavior. This can be used for various applications, including replay-debugging, reproducible artifacts, chaos mode concurrency testing and bug analysis.
Hermit launches linux x86_64 programs in a special, hermetically isolated sandbox to control their execution. Hermit translates normal, nondeterministic behavior, into deterministic, repeatable beh...

Fedora Silverblue 40 is out today. If you have rpm-fusion layered so you can’t upgrade through GNOME Software, run these commands in Terminal:
1. Pin current version:
sudo ostree admin pin 0
2. Handle rpm-fusion nastiness:
rpm-ostree update --uninstall rpmfusion-free-release --uninstall rpmfusion-nonfree-release --install rpmfusion-free-release --install rpmfusion-nonfree-release
3. Rebase to Fedora Silverblue 40:
rpm-ostree rebase fedora:fedora/40/x86_64/…

Lai Jiangshan posted a RFC patch-set introducing a new hypervisor called #PVM:
https://lore.kernel.org/lkml/20240226143630.33643-1-jiangshanlai@gmail.com/…

I bet @… finds SGI's x86 supercomputers a bit boring...
https://gsaauctions.gov/auctions/preview/282996

Remember how I've talked about running #x86 testing with `-mfpmath=sse` to avoid failures due to i387 precision?
Now I've discovered that #Pandas are failing (well, XPASS-ing) because they've marked a test to XFAIL on 32-bit architectures, most likely due to i387 results. Sigh.
#Gentoo #Python

Explainable Port Mapping Inference with Sparse Performance Counters for AMD's Zen Architectures
Fabian Ritter, Sebastian Hack
https://arxiv.org/abs/2403.16063

Explainable Port Mapping Inference with Sparse Performance Counters for AMD's Zen Architectures
Performance models are instrumental for optimizing performance-sensitive code. When modeling the use of functional units of out-of-order x86-64 CPUs, data availability varies by the manufacturer: Instruction-to-port mappings for Intel's processors are available, whereas information for AMD's designs are lacking. The reason for this disparity is that standard techniques to infer exact port mappings require hardware performance counters that AMD does not provide. In this work, we modify the por…