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kern: dump page table on user exception

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This commit is contained in:
Michael Scire 2020-07-21 00:56:13 -07:00 • committed by SciresM
parent 266001ded4
commit dea1235e12
5 changed files with 145 additions and 1 deletions
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5
libraries/libmesosphere/source/arch/arm64/kern_exception_handlers.cpp
View file

@ -46,7 +46,10 @@ namespace ams::kern::arch::arm64 {
MESOSPHERE_LOG("PC = %016lx\n", context->pc);
MESOSPHERE_LOG("SP = %016lx\n", context->sp);
MESOSPHERE_PANIC("Unhandled Exception in Supervisor Mode\n");
/* Dump the page tables. */
GetCurrentProcess().GetPageTable().DumpTable();
MESOSPHERE_PANIC("Unhandled Exception in User Mode\n");
const u64 ec = (esr >> 26) & 0x3F;
switch (ec) {

130
libraries/libmesosphere/source/arch/arm64/kern_k_page_table_impl.cpp
View file

@ -292,4 +292,134 @@ namespace ams::kern::arch::arm64 {
return false;
}
void KPageTableImpl::Dump(uintptr_t start, size_t size) const {
/* If zero size, there's nothing to dump. */
if (size == 0) {
return;
}
/* Define extents. */
const uintptr_t end = start + size;
const uintptr_t last = end - 1;
MESOSPHERE_LOG("==== PAGE TABLE DUMP START (%012lx - %012lx) ====\n", start, last);
ON_SCOPE_EXIT { MESOSPHERE_LOG("==== PAGE TABLE DUMP END ====\n"); };
/* Define tracking variables. */
bool unmapped = false;
uintptr_t unmapped_start = 0;
/* Walk the table. */
uintptr_t cur = start;
while (cur < end) {
/* Validate that we can read the actual entry. */
const size_t l0_index = GetL0Index(cur);
const size_t l1_index = GetL1Index(cur);
if (this->is_kernel) {
/* Kernel entries must be accessed via TTBR1. */
if ((l0_index != MaxPageTableEntries - 1) || (l1_index < MaxPageTableEntries - this->num_entries)) {
return;
}
} else {
/* User entries must be accessed with TTBR0. */
if ((l0_index != 0) || l1_index >= this->num_entries) {
return;
}
}
/* Try to get from l1 table. */
const L1PageTableEntry *l1_entry = this->GetL1Entry(cur);
if (l1_entry->IsBlock()) {
/* Update. */
cur = util::AlignDown(cur, L1BlockSize);
if (unmapped) {
unmapped = false;
MESOSPHERE_LOG("%012lx - %012lx: ---\n", unmapped_start, cur - 1);
}
/* Print. */
MESOSPHERE_LOG("%012lx: %016lx\n", cur, *reinterpret_cast<const u64 *>(l1_entry));
/* Advance. */
cur += L1BlockSize;
continue;
} else if (!l1_entry->IsTable()) {
/* Update. */
cur = util::AlignDown(cur, L1BlockSize);
if (!unmapped) {
unmapped_start = cur;
unmapped = true;
}
/* Advance. */
cur += L1BlockSize;
continue;
}
/* Try to get from l2 table. */
const L2PageTableEntry *l2_entry = this->GetL2Entry(l1_entry, cur);
if (l2_entry->IsBlock()) {
/* Update. */
cur = util::AlignDown(cur, L2BlockSize);
if (unmapped) {
unmapped = false;
MESOSPHERE_LOG("%012lx - %012lx: ---\n", unmapped_start, cur - 1);
}
/* Print. */
MESOSPHERE_LOG("%012lx: %016lx\n", cur, *reinterpret_cast<const u64 *>(l2_entry));
/* Advance. */
cur += L2BlockSize;
continue;
} else if (!l2_entry->IsTable()) {
/* Update. */
cur = util::AlignDown(cur, L2BlockSize);
if (!unmapped) {
unmapped_start = cur;
unmapped = true;
}
/* Advance. */
cur += L2BlockSize;
continue;
}
/* Try to get from l3 table. */
const L3PageTableEntry *l3_entry = this->GetL3Entry(l2_entry, cur);
if (l3_entry->IsBlock()) {
/* Update. */
cur = util::AlignDown(cur, L3BlockSize);
if (unmapped) {
unmapped = false;
MESOSPHERE_LOG("%012lx - %012lx: ---\n", unmapped_start, cur - 1);
}
/* Print. */
MESOSPHERE_LOG("%012lx: %016lx\n", cur, *reinterpret_cast<const u64 *>(l3_entry));
/* Advance. */
cur += L3BlockSize;
continue;
} else {
/* Update. */
cur = util::AlignDown(cur, L3BlockSize);
if (!unmapped) {
unmapped_start = cur;
unmapped = true;
}
/* Advance. */
cur += L3BlockSize;
continue;
}
}
/* Print the last unmapped range if necessary. */
if (unmapped) {
MESOSPHERE_LOG("%012lx - %012lx: ---\n", unmapped_start, last);
}
}
}