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February 28, 2023 23:10
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Simple hack to disable joystick scanning and remove stutters from Papers Please.
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#include <string> | |
#include <dlfcn.h> | |
#include <stdio.h> | |
#include <sys/mman.h> | |
#include <unistd.h> | |
#include <errno.h> | |
#include <stdlib.h> | |
using namespace std::literals; | |
template<class T> | |
constexpr T* page_round_down(T* ptr, size_t page_size) { | |
size_t page = reinterpret_cast<size_t>(ptr) & ~(page_size - 1); | |
return reinterpret_cast<T*>(page); | |
} | |
void patch_function(void* ptr, size_t offset) { | |
char* func = reinterpret_cast<char*>(ptr); | |
func += offset; | |
const long page_size = sysconf(_SC_PAGESIZE); | |
int result = mprotect(page_round_down(func, page_size), 1, PROT_READ | PROT_WRITE | PROT_EXEC); | |
if(result) { | |
fprintf(stderr, "result %d %d\n", result, errno); | |
return; | |
} | |
func[0] = 0xc3; | |
mprotect(page_round_down(func, page_size), 1, PROT_READ | PROT_EXEC); | |
} | |
using dlopen_t = void* (*)(const char*, int); | |
extern "C" | |
void* dlopen(const char* filename, int flags) { | |
static dlopen_t real_dlopen = nullptr; | |
if(!real_dlopen) | |
real_dlopen = reinterpret_cast<dlopen_t>(dlsym(RTLD_NEXT, "dlopen")); | |
void* handle = real_dlopen(filename, flags); | |
if(!filename || filename != "././lime.ndll"s) { | |
return handle; | |
} | |
char* symbol = getenv("PP_SYMBOL"); | |
if(!symbol) { | |
fprintf(stderr, "PP_SYMBOL not set\n"); | |
return handle; | |
} | |
char* offset = getenv("PP_OFFSET"); | |
if(!offset) { | |
fprintf(stderr, "PP_OFFSET not set\n"); | |
return handle; | |
} | |
void* func = dlsym(handle, symbol); | |
if(!func) { | |
fprintf(stderr, "could not find symbol: %s\n", symbol); | |
return handle; | |
} | |
patch_function(func, atoi(offset)); | |
return handle; | |
}⏎ |
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This was a bug that was fixed in lime. Now you can just download the latest version and replace lime.ndll. See https://www.gog.com/forum/papers_please/terrible_lags_on_linux_with_nvidia_gpu