mirror of https://gitlab.com/nakst/essence
43 lines
1.4 KiB
C++
43 lines
1.4 KiB
C++
// This file is part of the Essence operating system.
|
|
// It is released under the terms of the MIT license -- see LICENSE.md.
|
|
// Written by: nakst.
|
|
|
|
#include <stdint.h>
|
|
#include <stddef.h>
|
|
|
|
extern "C" void KernelInitialise();
|
|
extern "C" int EsStringCompareRaw(const char *s1, size_t b1, const char *s2, size_t b2);
|
|
extern "C" void EsPrint(const char *format, ...);
|
|
|
|
struct ExportedKernelFunction {
|
|
void *address;
|
|
const char *name;
|
|
};
|
|
|
|
const ExportedKernelFunction exportedKernelFunctions[] = {
|
|
#include <bin/generated_code/kernel_symbols.h>
|
|
};
|
|
|
|
static uintptr_t linkOffset;
|
|
|
|
void *_ResolveKernelSymbol(const char *name, size_t nameBytes) {
|
|
for (uintptr_t i = 0; i < sizeof(exportedKernelFunctions) / sizeof(exportedKernelFunctions[0]); i++) {
|
|
if (0 == EsStringCompareRaw(exportedKernelFunctions[i].name, -1, name, nameBytes)) {
|
|
return (void *) ((uintptr_t) exportedKernelFunctions[i].address - linkOffset);
|
|
}
|
|
}
|
|
|
|
EsPrint("ResolveKernelSymbol - Could not find symbol '%s'.\n", nameBytes, name);
|
|
return nullptr;
|
|
}
|
|
|
|
void *ResolveKernelSymbol(const char *name, size_t nameBytes) {
|
|
if (!linkOffset) {
|
|
// As we get the function addresses before the kernel is linked (this file needs to be linked with the kernel),
|
|
// they are relative to wherever the kernel_all.o's text is placed in the executable's text section.
|
|
linkOffset = (uintptr_t) _ResolveKernelSymbol("KernelInitialise", 10) - (uintptr_t) KernelInitialise;
|
|
}
|
|
|
|
return _ResolveKernelSymbol(name, nameBytes);
|
|
}
|