breadbox | Simple invoicing system catered to freelancers | Business library
kandi X-RAY | breadbox Summary
kandi X-RAY | breadbox Summary
Simple invoicing system catered to freelancers
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Top functions reviewed by kandi - BETA
- Loads the Ruby Rails installed Rails .
- Loads the initializer .
- Loads the configuration .
breadbox Key Features
breadbox Examples and Code Snippets
Community Discussions
Trending Discussions on breadbox
QUESTION
I'm reading this page https://www.muppetlabs.com/~breadbox/software/tiny/teensy.html
This is one of the example
...ANSWER
Answered 2020-Dec-27 at 02:47-static is not the default even with -nostdlib when GCC is configured to make PIEs by default. Use gcc -m32 -static -nostdlib to get the historical behaviour. (-static implies -no-pie). See What's the difference between "statically linked" and "not a dynamic executable" from Linux ldd? for more.
Also, you may need to disable alignment of other sections with gcc -Wl,--nmagic or using a custom linker script, and maybe disable extra sections of metadata that GCC adds. Minimal executable size now 10x larger after linking than 2 years ago, for tiny programs?
You probably don't have a .eh_frame section if you're not linking any compiler-generated (from C) .o files. But if you were, you can disable that with gcc -fno-asynchronous-unwind-tables. (See also How to remove "noise" from GCC/clang assembly output? for general tips aimed at looking at the compiler's asm text output, moreso than executable size.)
See also GCC + LD + NDISASM = huge amount of assembler instructions (ndisasm doesn't handle metadata at all, only flat binary, so it "disassembles" metadata. So the answer there includes info on how to avoid other sections.)
GCC -Wl,--build-id=none will avoid including a .note.gnu.build-id section in the executable.
QUESTION
According to this tutorial: http://www.muppetlabs.com/~breadbox/software/tiny/teensy.html, I can embed so piece of code inside a elf header structure.
One step before, where my code and elf header were separate (also in the tutorial), it works. But after that, it does not.
This is my source:
...ANSWER
Answered 2020-Jun-09 at 04:48You're not embedding source code (ASCII text), you're trying to embed machine code instructions into the ELF header.
Yours assembles to 83 bytes, but the article has an 84 byte version. It seems you changed something vs. the article's version, breaking it. Compare the binaries or source to figure out what you broke that makes the ELF headers invalid.
QUESTION
Having this in gas:
...ANSWER
Answered 2020-Jun-08 at 14:56In GAS syntax, "ELF" is a symbol reference to the symbol name ELF, not a multi-char string. In the context of .byte directive, it's only looking for a number, not a possible string.
And since you used it as one element of a list of .byte values, it's asking for the low byte of the absolute address, hence the .._8 relocation. The meaning is totally different from NASM's db.
In GAS when it's expecting a number, 'E' is allowed as an ASCII constant, but "E" isn't. e.g. mov $"E", %eax will give you a R_X86_64_32 E relocation.
Single quotes don't work either. A single-character literal does work as a number, e.g. as an immediate like mov $'a', %eax. But unlike NASM, GAS doesn't support multi-character character literals. So mov eax, 'Hey!' works in NASM, but mov $'Hey!', %eax doesn't work in GAS.
AFAIK, GAS only lets you use a sequence of multiple ASCII characters as literal data for a .ascii / .asciz directive, or the related .string / .string16 / .string32 narrow or wide character directives. (GAS manual)
You have a few options:
QUESTION
I'm trying to generate the smallest C program possible to see how many instructions are executed by running it. I disabled use of libraries and disabled vdso. Yet, my C program, which gdb says is 7 assembly instructions, ends up executing 17k instructions according to perf stat.
Is this a normal amount of instructions just to set up the program? According to gdb, code from ld-linux-x86-64.so.2 is mapped into the program address space. Given that I disabled vdso and am including no libraries, is this file necessary to run the program? Could this be the reason for the 17k instructions?
My C program foo5.c
...ANSWER
Answered 2020-Mar-06 at 19:25.globl _start
_start:
call main
movl $1, %eax
xorl %ebx, %ebx
int $0x80
int main(){
return 0;
}
gcc -O2 -nostdlib -nodefaultlibs stubstart.S foo5.c -o foo5
objdump -D foo5
00000000000002c0 :
2c0: 31 c0 xor %eax,%eax
2c2: c3 retq
00000000000002c3 <_start>:
2c3: e8 f8 ff ff ff callq 2c0
2c8: b8 01 00 00 00 mov $0x1,%eax
2cd: 31 db xor %ebx,%ebx
2cf: cd 80 int $0x80
QUESTION
At the moment, I'm making a lw interpreter for a programming language. http://www.muppetlabs.com/~breadbox/bf/ Anyways, I'm trying to implement a text area, but I want the scroll bars to be hidden. I've looked at multiple tutorials to do this, but none of them seemed to work. Here is the code for my fxml window
...ANSWER
Answered 2017-Dec-13 at 06:18This can be done by setting the horizontal+vertical scrollbar policies on the inner ScrollPane. I'm currently unsure if this can be done via FXML or Java API, however it can be achieved via CSS.
QUESTION
I'm trying to learn about the elf standard by writing an elf executable from scratch. Elf32 didn't pose much of a problem, using this code:
...ANSWER
Answered 2017-Jul-21 at 15:27dw 3 ; e_machine
As per the System V Application Binary Interface AMD64 Architecture Processor Supplement that value should instead be 62 for Advanced Micro Devices X86-64. With that change, it runs for me.
QUESTION
Problem:
I made an elf executable that self modifies one of its byte. It simply changes a 0 for a 1. When I run the executable normally, I can see that the change was successful because it runs exactly as expected (more on that further down). The problem arises when debugging it: The debugger (using radare2) returns the wrong value when looking at the modified byte.
Context:
I made a reverse engineering challenge, inspired by Smallest elf. You can see the "source code" (if you can even call it that) there: https://pastebin.com/Yr1nFX8W.
To assemble and execute:
...ANSWER
Answered 2017-Jun-30 at 23:19There is no issue with radare2 but your analysis of the program is incorrect thus the code that you wrote handles this RE incorrectly.
Lets start with
When i == 10, c = 0. That's because it's the index of the byte that is modified during execution.
That is partially true. It is set to zero at the beginning but then after each round there is this code:
QUESTION
I am looking for a little help. I am sitting at home trying to learn java programming from programmingbydoing.com. I need to make a program called TwentyQuestions. The code is missing something to make it work completely. I have tried to find help other places on the web. That is why the code looks much like other peoples code.
...ANSWER
Answered 2017-Jan-12 at 20:57when you want to compare Strings you need to use the method .equals() or in the case to ignore case .equalsIgnoreCase()
Try the code below and you'll see it works just fine.
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On a UNIX-like operating system, using your system’s package manager is easiest. However, the packaged Ruby version may not be the newest one. There is also an installer for Windows. Managers help you to switch between multiple Ruby versions on your system. Installers can be used to install a specific or multiple Ruby versions. Please refer ruby-lang.org for more information.
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