The usual rule of thumb (straight from Intels and AMD’s optimization manuals) is that every data type should be aligned by its own size. An int32 should be aligned on a 32-bit boundary, an int64 on a 64-bit boundary, and so on. A char will fit just fine anywhere. Another rule of thumb is, of … Read more
A quick fix of your code: push 0x41414141 ; put ‘AAAA’ into stack memory mov ecx,esp ; pointer to the ‘AAAA’ mov eax, 4 ; write is syscall 4 for 32-bit Linux mov ebx, 1 ; stdout mov edx, 4 int 0x80 add esp,4 ; restore stack No explanation, as you should first check what … Read more
It will cause a dynamic memory allocation failure, which usually will make the resultant application crash, but technically, an application could be written to withstand this event. 2GB is indeed the user address space size for an individual process- an application may use multiple processes (easiest example: Chrome). If an application asks for 100MB of … Read more
See this CodeCentral article: Using more than 3 GB memory in a 32 bit Delphi program. In modern Delphi versions just add compiler directive to the dpr: {$SetPEFlags IMAGE_FILE_LARGE_ADDRESS_AWARE}
#include <stdio.h> #include <sys/types.h> int main() { printf(“pid_t: %zu\n”, sizeof(pid_t)); printf(“uid_t: %zu\n”, sizeof(uid_t)); printf(“gid_t: %zu\n”, sizeof(gid_t)); } EDIT: Per popular request (and because, realistically, 99% of the people coming to this question are going to be running x86 or x86_64)… On an i686 and x86_64 (so, 32-bit and 64-bit) processor running Linux >= 3.0.0, the … Read more
My problem and the solution I have a 32 bit third party dll which I have installed in 2008 R2 machine which is 64 bit. I have a wcf service created in .net 4.5 framework which calls the 32 bit third party dll for process. Now I have build property set to target ‘any’ cpu … Read more
That depends on which variant of toolchain you’re currently using. Both DWARF and SEH variants (which come starting from GCC 4.8.0) are only single-target. You can see it yourself by inspecting the directory structure of their distributions, i.e. they contain only the libraries with either 64- or 32-bit addressing, but not both. On the other … Read more
This is known to work on Ubuntu 16.04 through 22.04: sudo apt install gcc-multilib g++-multilib Then a minimal hello world: main.c #include <stdio.h> int main(void) { puts(“hello world”); return 0; } compiles without warning with: gcc -m32 -ggdb3 -O0 -pedantic-errors -std=c89 \ -Wall -Wextra -pedantic -o main.out main.c And ./main.out outputs: hello world And: file … Read more
No. You can’t directly link to 32bit code inside of a 64bit program. The best option is to compile a 32bit (standalone) program that can run on your 64bit platform (using ia32), and then use a form of inter-process communication to communicate to it from your 64bit program.
Yup, I think you understand what’s going on. SetWindowsHookEx() requires a valid module handle, and verifies it, but it doesn’t actually use it when you set a low-level hook. You just need a valid handle, it doesn’t matter which specific one. Calling LoadLibrary(“user32.dll”) is a good way to get a handle, that DLL will always … Read more