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kern/ldr: add support for --x executables

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This commit is contained in:
Michael Scire 2024-10-09 17:42:02 -07:00 • committed by SciresM
parent 2855b8ee35
commit ff38a32a9b
9 changed files with 54 additions and 40 deletions
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29
libraries/libmesosphere/source/arch/arm64/kern_exception_handlers.cpp
View file

@ -100,6 +100,8 @@ namespace ams::kern::arch::arm64 {
u32 insn_value = 0;
if (UserspaceAccess::CopyMemoryFromUser(std::addressof(insn_value), reinterpret_cast<u32 *>(context->pc), sizeof(insn_value))) {
insn = insn_value;
} else if (KTargetSystem::IsDebugMode() && (context->pc & 3) == 0 && UserspaceAccess::CopyMemoryFromUserSize32BitWithSupervisorAccess(std::addressof(insn_value), reinterpret_cast<u32 *>(context->pc))) {
insn = insn_value;
} else {
insn = 0;
}
@ -112,33 +114,6 @@ namespace ams::kern::arch::arm64 {
bool should_process_user_exception = KTargetSystem::IsUserExceptionHandlersEnabled();
const u64 ec = (esr >> 26) & 0x3F;
switch (ec) {
case EsrEc_Unknown:
case EsrEc_IllegalExecution:
case EsrEc_Svc32:
case EsrEc_Svc64:
case EsrEc_PcAlignmentFault:
case EsrEc_SpAlignmentFault:
case EsrEc_SErrorInterrupt:
case EsrEc_BreakPointEl0:
case EsrEc_SoftwareStepEl0:
case EsrEc_WatchPointEl0:
case EsrEc_BkptInstruction:
case EsrEc_BrkInstruction:
break;
default:
{
/* If the fault address's state is KMemoryState_Code and the user can't read the address, force processing exception. */
KMemoryInfo info;
ams::svc::PageInfo pi;
if (R_SUCCEEDED(cur_process.GetPageTable().QueryInfo(std::addressof(info), std::addressof(pi), far))) {
if (info.GetState() == KMemoryState_Code && ((info.GetPermission() & KMemoryPermission_UserRead) != KMemoryPermission_UserRead)) {
should_process_user_exception = true;
}
}
}
break;
}
/* In the event that we return from this exception, we want SPSR.SS set so that we advance an instruction if single-stepping. */
#if defined(MESOSPHERE_ENABLE_HARDWARE_SINGLE_STEP)

15
libraries/libmesosphere/source/arch/arm64/kern_userspace_memory_access_asm.s
View file

@ -154,6 +154,21 @@ _ZN3ams4kern4arch5arm6415UserspaceAccess27CopyMemoryFromUserSize32BitEPvPKv:
mov x0, #1
ret
/* ams::kern::arch::arm64::UserspaceAccess::CopyMemoryFromUserSize32BitWithSupervisorAccessImpl(void *dst, const void *src) */
.section .text._ZN3ams4kern4arch5arm6415UserspaceAccess51CopyMemoryFromUserSize32BitWithSupervisorAccessImplEPvPKv, "ax", %progbits
.global _ZN3ams4kern4arch5arm6415UserspaceAccess51CopyMemoryFromUserSize32BitWithSupervisorAccessImplEPvPKv
.type _ZN3ams4kern4arch5arm6415UserspaceAccess51CopyMemoryFromUserSize32BitWithSupervisorAccessImplEPvPKv, %function
.balign 0x10
_ZN3ams4kern4arch5arm6415UserspaceAccess51CopyMemoryFromUserSize32BitWithSupervisorAccessImplEPvPKv:
/* Just load and store a u32. */
/* NOTE: This is done with supervisor access permissions. */
ldr w2, [x1]
str w2, [x0]
/* We're done. */
mov x0, #1
ret
/* ams::kern::arch::arm64::UserspaceAccess::CopyStringFromUser(void *dst, const void *src, size_t size) */
.section .text._ZN3ams4kern4arch5arm6415UserspaceAccess18CopyStringFromUserEPvPKvm, "ax", %progbits
.global _ZN3ams4kern4arch5arm6415UserspaceAccess18CopyStringFromUserEPvPKvm

5
libraries/libmesosphere/source/kern_k_page_table_base.cpp
View file

@ -1787,6 +1787,11 @@ namespace ams::kern {
/* We're going to perform an update, so create a helper. */
KScopedPageTableUpdater updater(this);
/* If we're creating an executable mapping, take and immediately release the scheduler lock. This will force a reschedule. */
if (is_x) {
KScopedSchedulerLock sl;
}
/* Perform mapping operation. */
const KPageProperties properties = { new_perm, false, false, DisableMergeAttribute_None };
const auto operation = was_x ? OperationType_ChangePermissionsAndRefreshAndFlush : OperationType_ChangePermissions;

1
libraries/libmesosphere/source/svc/kern_svc_process_memory.cpp
View file

@ -27,6 +27,7 @@ namespace ams::kern::svc {
case ams::svc::MemoryPermission_Read:
case ams::svc::MemoryPermission_ReadWrite:
case ams::svc::MemoryPermission_ReadExecute:
case ams::svc::MemoryPermission_Execute:
return true;
default:
return false;