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kern: Support older SVC ABIs

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This commit is contained in:
Michael Scire 2020-07-13 18:50:37 -07:00 • committed by SciresM
parent 3d2eb8e903
commit ff022115ca
7 changed files with 94 additions and 21 deletions
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48
libraries/libmesosphere/source/arch/arm64/svc/kern_svc_tables.cpp
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@ -55,7 +55,7 @@ namespace ams::kern::svc {
std::array<SvcTableEntry, NumSupervisorCalls> table = {};
#define AMS_KERN_SVC_SET_TABLE_ENTRY(ID, RETURN_TYPE, NAME, ...) \
table[ID] = NAME::Call64From32;
if (table[ID] == nullptr) { table[ID] = NAME::Call64From32; }
AMS_SVC_FOREACH_KERN_DEFINITION(AMS_KERN_SVC_SET_TABLE_ENTRY, _)
#undef AMS_KERN_SVC_SET_TABLE_ENTRY
@ -66,7 +66,7 @@ namespace ams::kern::svc {
std::array<SvcTableEntry, NumSupervisorCalls> table = {};
#define AMS_KERN_SVC_SET_TABLE_ENTRY(ID, RETURN_TYPE, NAME, ...) \
table[ID] = NAME::Call64;
if (table[ID] == nullptr) { table[ID] = NAME::Call64; }
AMS_SVC_FOREACH_KERN_DEFINITION(AMS_KERN_SVC_SET_TABLE_ENTRY, _)
#undef AMS_KERN_SVC_SET_TABLE_ENTRY
@ -92,4 +92,48 @@ namespace ams::kern::svc {
constinit const std::array<SvcTableEntry, NumSupervisorCalls> SvcTable64From32 = SvcTable64From32Impl;
namespace {
/* NOTE: Although the SVC tables are constants, our global constructor will run before .rodata is protected R--. */
class SvcTablePatcher {
private:
using SvcTable = std::array<SvcTableEntry, NumSupervisorCalls>;
private:
static SvcTablePatcher s_instance;
private:
ALWAYS_INLINE volatile SvcTableEntry *GetEditableTable(const SvcTable *table) {
if (table != nullptr) {
return const_cast<volatile SvcTableEntry *>(table->data());
} else {
return nullptr;
}
}
/* TODO: This should perhaps be implemented in assembly. */
NOINLINE void PatchTables(volatile SvcTableEntry *table_64, volatile SvcTableEntry *table_64_from_32) {
/* Get the target firmware. */
const auto target_fw = kern::GetTargetFirmware();
/* 10.0.0 broke the ABI for QueryIoMapping. */
if (target_fw < TargetFirmware_10_0_0) {
if (table_64) { table_64[ svc::SvcId_QueryIoMapping] = LegacyQueryIoMapping::Call64; }
if (table_64_from_32) { table_64_from_32[svc::SvcId_QueryIoMapping] = LegacyQueryIoMapping::Call64From32; }
}
/* 3.0.0 broke the ABI for ContinueDebugEvent. */
if (target_fw < TargetFirmware_3_0_0) {
if (table_64) { table_64[ svc::SvcId_ContinueDebugEvent] = LegacyContinueDebugEvent::Call64; }
if (table_64_from_32) { table_64_from_32[svc::SvcId_ContinueDebugEvent] = LegacyContinueDebugEvent::Call64From32; }
}
}
public:
SvcTablePatcher(const SvcTable *table_64, const SvcTable *table_64_from_32) {
PatchTables(GetEditableTable(table_64), GetEditableTable(table_64_from_32));
}
};
SvcTablePatcher SvcTablePatcher::s_instance(std::addressof(SvcTable64), std::addressof(SvcTable64From32));
}
}