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Kernel: Allow modules to link against anything in kernel.map :^)

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We now use the symbols from kernel.map to link modules as they are
loaded into the kernel. This is pretty fricken cool!
This commit is contained in:
Andreas Kling
2019-11-28 21:30:20 +01:00
parent 1f34e16ec6
commit 4ef6be8212
5 changed files with 27 additions and 20 deletions
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29
Kernel/Process.cpp
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@@ -3382,20 +3382,6 @@ int Process::sys$beep()
return 0;
}
extern "C" void outside_func()
{
kprintf("I'm the outside func!\n");
}
static u32 find_kernel_symbol(const StringView& name)
{
if (name == "kprintf")
return (u32)kprintf;
if (name == "outside_func")
return (u32)outside_func;
ASSERT_NOT_REACHED();
}
int Process::sys$module_load(const char* path, size_t path_length)
{
#if 0
@@ -3439,7 +3425,7 @@ int Process::sys$module_load(const char* path, size_t path_length)
case R_386_PC32: {
// PC-relative relocation
dbg() << "PC-relative relocation: " << relocation.symbol().name();
u32 symbol_address = find_kernel_symbol(relocation.symbol().name());
u32 symbol_address = address_for_kernel_symbol(relocation.symbol().name());
dbg() << " Symbol address: " << (void*)symbol_address;
ptrdiff_t relative_offset = (char*)symbol_address - ((char*)&patch_ptr + 4);
patch_ptr = relative_offset;
@@ -3447,9 +3433,16 @@ int Process::sys$module_load(const char* path, size_t path_length)
}
case R_386_32: // Absolute relocation
dbg() << "Absolute relocation: '" << relocation.symbol().name() << "' value:" << relocation.symbol().value() << ", index:" << relocation.symbol_index();
auto* section_storage_containing_symbol = section_storage_by_name.get(relocation.symbol().section().name()).value_or(nullptr);
ASSERT(section_storage_containing_symbol);
patch_ptr += (ptrdiff_t)(section_storage_containing_symbol + relocation.symbol().value());
if (relocation.symbol().bind() == STB_LOCAL) {
auto* section_storage_containing_symbol = section_storage_by_name.get(relocation.symbol().section().name()).value_or(nullptr);
ASSERT(section_storage_containing_symbol);
patch_ptr += (ptrdiff_t)(section_storage_containing_symbol + relocation.symbol().value());
} else if (relocation.symbol().bind() == STB_GLOBAL) {
patch_ptr += address_for_kernel_symbol(relocation.symbol().name());
} else {
ASSERT_NOT_REACHED();
}
break;
}
return IterationDecision::Continue;