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Kernel: Support loading the kernel at almost arbitrary virtual addresses

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This enables further work on implementing KASLR by adding relocation
support to the pre-kernel and updating the kernel to be less dependent
on specific virtual memory layouts.
This commit is contained in:
Gunnar Beutner 2021-07-26 15:10:51 +02:00 • committed by Andreas Kling
parent e3d2ca6bd2
commit 57417a3d6e
20 changed files with 123 additions and 87 deletions
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4
Kernel/KSyms.cpp
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@ -83,7 +83,7 @@ UNMAP_AFTER_INIT static void load_kernel_symbols_from_data(ReadonlyBytes const&
}
}
auto& ksym = s_symbols[current_symbol_index];
ksym.address = address;
ksym.address = kernel_load_base + address;
char* name = static_cast<char*>(kmalloc_eternal((bufptr - start_of_name) + 1));
memcpy(name, start_of_name, bufptr - start_of_name);
name[bufptr - start_of_name] = '\0';
@ -118,7 +118,7 @@ NEVER_INLINE static void dump_backtrace_impl(FlatPtr base_pointer, bool use_ksym
if (use_ksyms) {
FlatPtr copied_stack_ptr[2];
for (FlatPtr* stack_ptr = (FlatPtr*)base_pointer; stack_ptr && recognized_symbol_count < max_recognized_symbol_count; stack_ptr = (FlatPtr*)copied_stack_ptr[0]) {
if ((FlatPtr)stack_ptr < kernel_base)
if ((FlatPtr)stack_ptr < kernel_load_base)
break;
void* fault_at;