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kern: load initial process binary from user pool, rather than from pt heap

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This commit is contained in:
Michael Scire
2021-04-07 12:25:10 -07:00
committed by SciresM
parent a1e137cc1c
commit 0f8b7be2d2
13 changed files with 350 additions and 184 deletions
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3
mesosphere/kernel/source/arch/arm64/init/kern_init_core.cpp
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@@ -362,10 +362,9 @@ namespace ams::kern::init {
/* NOTE: Nintendo does this only on 10.0.0+ */
init_pt.PhysicallyRandomize(slab_region_start, slab_region_size, false);
/* Determine size available for kernel page table heaps, requiring > 8 MB. */
/* Determine size available for kernel page table heaps. */
const KPhysicalAddress resource_end_phys_addr = slab_start_phys_addr + resource_region_size;
const size_t page_table_heap_size = GetInteger(resource_end_phys_addr) - GetInteger(slab_end_phys_addr);
MESOSPHERE_INIT_ABORT_UNLESS(page_table_heap_size / 4_MB > 2);
/* Insert a physical region for the kernel page table heap region */
MESOSPHERE_INIT_ABORT_UNLESS(KMemoryLayout::GetPhysicalMemoryRegionTree().Insert(GetInteger(slab_end_phys_addr), page_table_heap_size, KMemoryRegionType_DramKernelPtHeap));

2
mesosphere/kernel/source/arch/arm64/init/start.s
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@@ -53,7 +53,7 @@ __metadata_kernel_layout:
.word __bss_start__ - _start /* rw_end_offset */
.word __bss_start__ - _start /* bss_offset */
.word __bss_end__ - _start /* bss_end_offset */
.word __end__ - _start /* ini_load_offset */
.word __end__ - _start /* resource_offset */
.word _DYNAMIC - _start /* dynamic_offset */
.word __init_array_start - _start /* init_array_offset */
.word __init_array_end - _start /* init_array_end_offset */

12
mesosphere/kernel_ldr/source/kern_init_loader.cpp
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@@ -172,7 +172,7 @@ namespace ams::kern::init::loader {
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(rw_offset, PageSize));
MESOSPHERE_INIT_ABORT_UNLESS(util::IsAligned(bss_end_offset, PageSize));
const uintptr_t bss_offset = layout->bss_offset;
const uintptr_t ini_load_offset = layout->ini_load_offset;
const uintptr_t resource_offset = layout->resource_offset;
const uintptr_t dynamic_offset = layout->dynamic_offset;
const uintptr_t init_array_offset = layout->init_array_offset;
const uintptr_t init_array_end_offset = layout->init_array_end_offset;
@@ -181,8 +181,8 @@ namespace ams::kern::init::loader {
const size_t resource_region_size = KMemoryLayout::GetResourceRegionSizeForInit();
/* Setup the INI1 header in memory for the kernel. */
const uintptr_t ini_end_address = base_address + ini_load_offset + resource_region_size;
const uintptr_t ini_load_address = ini_end_address - InitialProcessBinarySizeMax;
const uintptr_t resource_end_address = base_address + resource_offset + resource_region_size;
const uintptr_t ini_load_address = GetInteger(KSystemControl::Init::GetInitialProcessBinaryPhysicalAddress());
if (ini_base_address != ini_load_address) {
/* The INI is not at the correct address, so we need to relocate it. */
const InitialProcessBinaryHeader *ini_header = reinterpret_cast<const InitialProcessBinaryHeader *>(ini_base_address);
@@ -195,14 +195,14 @@ namespace ams::kern::init::loader {
}
}
/* We want to start allocating page tables at ini_end_address. */
g_initial_page_allocator.Initialize(ini_end_address);
/* We want to start allocating page tables at the end of the resource region. */
g_initial_page_allocator.Initialize(resource_end_address);
/* Make a new page table for TTBR1_EL1. */
KInitialPageTable init_pt(KernelBaseRangeStart, KernelBaseRangeLast, g_initial_page_allocator);
/* Setup initial identity mapping. TTBR1 table passed by reference. */
SetupInitialIdentityMapping(init_pt, base_address, bss_end_offset, ini_end_address, InitialPageTableRegionSizeMax, g_initial_page_allocator);
SetupInitialIdentityMapping(init_pt, base_address, bss_end_offset, resource_end_address, InitialPageTableRegionSizeMax, g_initial_page_allocator);
/* Generate a random slide for the kernel's base address. */
const KVirtualAddress virtual_base_address = GetRandomKernelBaseAddress(init_pt, base_address, bss_end_offset);