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[patcher, ro] runtime tls patch (#4492) optimization

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This commit is contained in:
xbzk
2026-10-11 02:25:51 -03:00
parent 6352612425
commit cff2ea58bb
3 changed files with 88 additions and 23 deletions
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src/core/arm/nce/patcher.cpp
+42
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@@ -45,6 +45,23 @@ Patcher::Patcher() : c(m_patch_instructions), c_pre(m_patch_instructions_pre) {
WriteLoadContext(c_pre);
}
Patcher::Patcher(std::span<const u8> text) : c(m_patch_instructions), c_pre(m_patch_instructions_pre) {
modules.emplace_back();
curr_patch = &modules.back();
const auto words = std::span<const u32>{reinterpret_cast<const u32*>(text.data()), text.size() / sizeof(u32)};
for (u32 i = ModuleCodeIndex; i < static_cast<u32>(words.size()); ++i) {
const uintptr_t offset = i * sizeof(u32);
if (auto mrs = MRS{words[i]}; mrs.Verify() && mrs.GetRt() != 31 && (mrs.GetSystemReg() == TpidrEl0 || mrs.GetSystemReg() == TpidrroEl0)) {
BranchToPatch(offset);
const auto src_reg = mrs.GetSystemReg() == TpidrroEl0 ? oaknut::SystemReg::TPIDRRO_EL0 : oaknut::SystemReg::TPIDR_EL0;
WriteMrsHandler(offset + sizeof(u32), oaknut::XReg{static_cast<int>(mrs.GetRt())}, src_reg);
} else if (auto msr = MSR{words[i]}; msr.Verify() && msr.GetSystemReg() == TpidrEl0) {
BranchToPatch(offset);
WriteMsrHandler(offset + sizeof(u32), oaknut::XReg{static_cast<int>(msr.GetRt())});
}
}
}
Patcher::~Patcher() = default;
bool Patcher::PatchText(std::span<const u8> program_image, const Kernel::CodeSet::Segment& code) {
@@ -182,6 +199,31 @@ bool Patcher::PatchText(std::span<const u8> program_image, const Kernel::CodeSet
return true;
}
std::span<const u32> Patcher::RelocateRuntimeTls(
s64 patch_offset, std::vector<InstructionPatch>& out_patches) {
const auto& patch = modules.front();
const auto can_branch = [](s64 offset) {
return offset % 4 == 0 && offset >= -static_cast<s64>(MaxRelativeBranch) && offset < static_cast<s64>(MaxRelativeBranch);
};
out_patches.clear();
out_patches.reserve(patch.m_branch_to_patch_relocations.size());
for (const auto& rel : patch.m_branch_to_patch_relocations) {
const s64 offset = patch_offset + rel.patch_offset - static_cast<s64>(rel.module_offset);
if (!can_branch(offset)) {return {};}
u32 replacement;
oaknut::CodeGenerator rc{&replacement};
rc.B(offset);
out_patches.push_back({rel.module_offset, replacement});
}
for (const auto& rel : patch.m_branch_to_module_relocations) {
const s64 offset = static_cast<s64>(rel.module_offset) - patch_offset - rel.patch_offset;
if (!can_branch(offset)) {return {};}
oaknut::CodeGenerator rc{m_patch_instructions.data() + rel.patch_offset / sizeof(u32)};
rc.B(offset);
}
return m_patch_instructions;
}
bool Patcher::RelocateAndCopy(Common::ProcessAddress load_base, const Kernel::CodeSet::Segment& code, std::vector<u8>& program_image, EntryTrampolines* out_trampolines) {
const size_t patch_size = GetSectionSize();
const size_t pre_patch_size = GetPreSectionSize();