mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-17 17:36:44 +00:00
kern/ldr: move crt0 into .rodata
This commit is contained in:
Michael Scire
SciresM
parent
4ca3c44e5f
commit
0daef4a6e8
7 changed files with 220 additions and 90 deletions
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@ -24,6 +24,9 @@ namespace ams::nxboot {
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namespace {
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constexpr u32 MesoshereMetadataLayout0Magic = util::FourCC<'M','S','S','0'>::Code;
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constexpr u32 MesoshereMetadataLayout1Magic = util::FourCC<'M','S','S','1'>::Code;
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struct InitialProcessBinaryHeader {
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static constexpr u32 Magic = util::FourCC<'I','N','I','1'>::Code;
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@ -1011,7 +1014,20 @@ namespace ams::nxboot {
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}
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/* Set the embedded ini pointer. */
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std::memcpy(payload_data + 8, std::addressof(meso_size), sizeof(meso_size));
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const u32 magic = *reinterpret_cast<const u32 *>(payload_data + 4);
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if (magic == MesoshereMetadataLayout0Magic) {
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std::memcpy(payload_data + 8, std::addressof(meso_size), sizeof(meso_size));
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} else if (magic == MesoshereMetadataLayout1Magic) {
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if (const u32 meta_offset = *reinterpret_cast<const u32 *>(payload_data + 8); meta_offset <= meso_size - sizeof(meso_size)) {
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s64 relative_offset = meso_size - meta_offset;
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std::memcpy(payload_data + meta_offset, std::addressof(relative_offset), sizeof(relative_offset));
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} else {
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ShowFatalError("Invalid mesosphere metadata layout!\n");
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}
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} else {
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ShowFatalError("Unknown mesosphere metadata version!\n");
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}
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/* Get the ini pointer. */
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InitialProcessBinaryHeader * const ini = reinterpret_cast<InitialProcessBinaryHeader *>(payload_data + meso_size);
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@ -31,8 +31,22 @@ namespace ams::kern::init {
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u32 dynamic_offset;
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u32 init_array_offset;
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u32 init_array_end_offset;
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u32 sysreg_offset;
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};
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static_assert(util::is_pod<KernelLayout>::value);
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static_assert(sizeof(KernelLayout) == 0x30);
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static_assert(sizeof(KernelLayout) == 0x34);
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#if defined(ATMOSPHERE_ARCH_ARM64)
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struct KernelSystemRegisters {
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u64 ttbr0_el1;
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u64 ttbr1_el1;
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u64 tcr_el1;
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u64 mair_el1;
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u64 sctlr_el1;
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};
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#else
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struct KernelSystemRegisters {
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};
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#endif
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}
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@ -17,11 +17,16 @@ def main(argc, argv):
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kernel_ldr = f.read()
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with open(argv[2], 'rb') as f:
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kernel = f.read()
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kernel_metadata_offset = 4
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kernel_metaptr_offset = 4
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assert (kernel_metaptr_offset <= len(kernel) - 0x40)
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assert (kernel[kernel_metaptr_offset:kernel_metaptr_offset + 4] == b'MSS1')
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kernel_metadata_offset = up('<I', kernel[kernel_metaptr_offset+4:kernel_metaptr_offset+8])[0]
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assert (kernel_metadata_offset <= len(kernel) - 0x40)
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assert (kernel[kernel_metadata_offset:kernel_metadata_offset + 4] == b'MSS0')
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bss_start, bss_end, kernel_end = up('<III', kernel[kernel_metadata_offset + 0x30:kernel_metadata_offset + 0x3C])
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bss_start, bss_end, kernel_end = up('<III', kernel[kernel_metadata_offset + 0x2C:kernel_metadata_offset + 0x38])
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bss_start += kernel_metadata_offset + 0x14
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bss_end += kernel_metadata_offset + 0x14
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kernel_end += kernel_metadata_offset + 0x14
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assert (bss_end >= bss_start)
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assert (bss_end == kernel_end)
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@ -53,9 +58,9 @@ def main(argc, argv):
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mesosphere_end = align_up(kernel_ldr_end, 0x1000)
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with open(argv[3], 'wb') as f:
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f.write(kernel[:kernel_metadata_offset + 4])
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f.write(pk('<QQI', embedded_ini_offset, kernel_ldr_offset, atmosphere_target_firmware(13, 0, 0)))
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f.write(kernel[kernel_metadata_offset + 0x18:])
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f.write(kernel[:kernel_metadata_offset])
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f.write(pk('<QQI', embedded_ini_offset - (kernel_metadata_offset), kernel_ldr_offset - (kernel_metadata_offset + 8), atmosphere_target_firmware(17, 0, 0)))
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f.write(kernel[kernel_metadata_offset + 0x14:])
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f.seek(embedded_ini_offset)
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f.write(embedded_ini_header)
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f.write(embedded_kips)
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@ -16,9 +16,25 @@ SECTIONS
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. = __start__;
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__code_start = . ;
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.crt0 :
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.start :
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{
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KEEP (*(.crt0 .crt0.*))
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KEEP (*(.start .start.*))
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. = ALIGN(8);
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} :code
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/* .sleep. */
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.sleep :
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{
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KEEP( *(.sleep .sleep.*) )
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. = ALIGN(8);
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} :code
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/* .vectors. */
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. = ALIGN(2K);
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__vectors_start__ = . ;
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.vectors :
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{
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KEEP( *(.vectors) )
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. = ALIGN(8);
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} :code
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@ -51,28 +67,16 @@ SECTIONS
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. = ALIGN(8);
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} :code
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/* .sleep. */
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. = ALIGN(4K);
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__sleep_start__ = . ;
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.sleep :
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{
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KEEP( *(.sleep .sleep.*) )
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. = ALIGN(8);
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} :code
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/* .vectors. */
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. = ALIGN(2K);
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__vectors_start__ = . ;
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.vectors :
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{
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KEEP( *(.vectors) )
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. = ALIGN(8);
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} :code
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/* =========== RODATA section =========== */
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. = ALIGN(0x1000);
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__rodata_start = . ;
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.rodata.text.crt0 :
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{
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KEEP (*(.crt0 .crt0.*))
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. = ALIGN(8);
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} :code
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.rodata :
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{
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*(.rodata .rodata.* .gnu.linkonce.r.*)
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@ -33,7 +33,37 @@
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adr reg, label; \
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ldr reg, [reg]
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#define LOAD_RELATIVE_FROM_LABEL(reg, reg2, label) \
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adr reg2, label; \
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ldr reg, [reg2]; \
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add reg, reg, reg2
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#define INDIRECT_RELATIVE_CALL(reg, reg2, label) \
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adr reg, label; \
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add reg, reg, reg2; \
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blr reg
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#define SETUP_SYSTEM_REGISTER(_reg, _sr) \
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LOAD_FROM_LABEL(_reg, __sysreg_constant_ ## _sr); \
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msr _sr, _reg
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.section .start, "ax", %progbits
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.global _start
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_start:
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b _ZN3ams4kern4init10StartCore0Emm
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__metadata_magic_number:
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.ascii "MSS1" /* Magic, if executed as gadget "adds w13, w26, #0x4d4, lsl #12" */
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__metadata_offset:
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.word __metadata_begin - _start
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#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
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.global _ZN3ams4kern17GetTargetFirmwareEv
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.type _ZN3ams4kern17GetTargetFirmwareEv, %function
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_ZN3ams4kern17GetTargetFirmwareEv:
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adr x0, __metadata_target_firmware
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ldr w0, [x0]
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ret
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#endif
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.section .crt0.text.start, "ax", %progbits
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@ -45,43 +75,6 @@ _ZN3ams4kern4init31IdentityMappedFunctionAreaBeginEv:
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/* ================ Functions after this line remain identity-mapped after initialization finishes. ================ */
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.global _start
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_start:
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b _ZN3ams4kern4init10StartCore0Emm
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__metadata_begin:
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.ascii "MSS0" /* Magic */
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__metadata_ini_offset:
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.quad 0 /* INI1 base address. */
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__metadata_kernelldr_offset:
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.quad 0 /* Kernel Loader base address. */
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__metadata_target_firmware:
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.word 0xCCCCCCCC /* Target firmware. */
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__metadata_kernel_layout:
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.word _start - _start /* rx_offset */
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.word __rodata_start - _start /* rx_end_offset */
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.word __rodata_start - _start /* ro_offset */
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.word __data_start - _start /* ro_end_offset */
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.word __data_start - _start /* rw_offset */
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.word __bss_start__ - _start /* rw_end_offset */
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.word __bss_start__ - _start /* bss_offset */
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.word __bss_end__ - _start /* bss_end_offset */
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.word __end__ - _start /* resource_offset */
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.word _DYNAMIC - _start /* dynamic_offset */
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.word __init_array_start - _start /* init_array_offset */
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.word __init_array_end - _start /* init_array_end_offset */
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.if (. - __metadata_begin) != 0x48
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.error "Incorrect Mesosphere Metadata"
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.endif
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#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
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.global _ZN3ams4kern17GetTargetFirmwareEv
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.type _ZN3ams4kern17GetTargetFirmwareEv, %function
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_ZN3ams4kern17GetTargetFirmwareEv:
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adr x0, __metadata_target_firmware
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ldr w0, [x0]
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ret
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#endif
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/* ams::kern::init::StartCore0(uintptr_t, uintptr_t) */
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.section .crt0.text._ZN3ams4kern4init10StartCore0Emm, "ax", %progbits
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.global _ZN3ams4kern4init10StartCore0Emm
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@ -139,28 +132,31 @@ _ZN3ams4kern4init10StartCore0Emm:
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/* Get the unknown debug region. */
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/* TODO: This is always zero in release kernels -- what is this? Is it the device tree buffer? */
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mov x21, #0
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nop
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/* We want to invoke kernel loader. */
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adr x0, _start
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adr x1, __metadata_kernel_layout
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LOAD_FROM_LABEL(x2, __metadata_ini_offset)
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add x2, x0, x2
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LOAD_FROM_LABEL(x3, __metadata_kernelldr_offset)
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add x3, x0, x3
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LOAD_RELATIVE_FROM_LABEL(x2, x4, __metadata_ini_offset)
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LOAD_RELATIVE_FROM_LABEL(x3, x4, __metadata_kernelldr_offset)
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/* Invoke kernel loader. */
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blr x3
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/* Save the offset to virtual address from this page's physical address for our use. */
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mov x24, x1
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/* At this point kernelldr has been invoked, and we are relocated at a random virtual address. */
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/* Next thing to do is to set up our memory management and slabheaps -- all the other core initialization. */
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/* Call ams::kern::init::InitializeCore(uintptr_t, void **) */
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mov x1, x0 /* Kernelldr returns a state object for the kernel to re-use. */
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mov x0, x21 /* Use the address we determined earlier. */
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bl _ZN3ams4kern4init20InitializeCorePhase1EmPPv
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init20InitializeCorePhase1EmPPv)
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/* Get the init arguments for core 0. */
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mov x0, xzr
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bl _ZN3ams4kern4init16GetInitArgumentsEi
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nop
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init16GetInitArgumentsEi)
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/* Setup the stack pointer. */
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ldr x2, [x0, #(INIT_ARGUMENTS_SP)]
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@ -168,15 +164,24 @@ _ZN3ams4kern4init10StartCore0Emm:
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/* Perform further initialization with the stack pointer set up, as required. */
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/* This will include e.g. unmapping the identity mapping. */
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bl _ZN3ams4kern4init20InitializeCorePhase2Ev
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init20InitializeCorePhase2Ev)
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/* Get the init arguments for core 0. */
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mov x0, xzr
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bl _ZN3ams4kern4init16GetInitArgumentsEi
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nop
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INDIRECT_RELATIVE_CALL(x16, x24, _ZN3ams4kern4init16GetInitArgumentsEi)
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/* Invoke the entrypoint. */
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/* Retrieve entrypoint and argument. */
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ldr x1, [x0, #(INIT_ARGUMENTS_ENTRYPOINT)]
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ldr x0, [x0, #(INIT_ARGUMENTS_ARGUMENT)]
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/* Set sctlr_el1 and ensure instruction consistency. */
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SETUP_SYSTEM_REGISTER(x3, sctlr_el1)
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dsb sy
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isb
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/* Invoke the entrypoint. */
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blr x1
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0: /* If we return here, something has gone wrong, so wait forever. */
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@ -218,15 +223,11 @@ _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
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/* Disable the MMU/Caches. */
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bl _ZN3ams4kern4init19DisableMmuAndCachesEv
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/* Setup system registers using values from our KInitArguments. */
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ldr x1, [x20, #(INIT_ARGUMENTS_TTBR0)]
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msr ttbr0_el1, x1
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ldr x1, [x20, #(INIT_ARGUMENTS_TTBR1)]
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msr ttbr1_el1, x1
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ldr x1, [x20, #(INIT_ARGUMENTS_TCR)]
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msr tcr_el1, x1
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ldr x1, [x20, #(INIT_ARGUMENTS_MAIR)]
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msr mair_el1, x1
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/* Setup system registers using values from constants table. */
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SETUP_SYSTEM_REGISTER(x1, ttbr0_el1)
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SETUP_SYSTEM_REGISTER(x1, ttbr1_el1)
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SETUP_SYSTEM_REGISTER(x1, tcr_el1)
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SETUP_SYSTEM_REGISTER(x1, mair_el1)
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/* Perform cpu-specific setup. */
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mrs x1, midr_el1
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@ -251,13 +252,12 @@ _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
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isb
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/* Load remaining needed fields from the init args. */
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ldr x3, [x20, #(INIT_ARGUMENTS_SCTLR)]
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ldr x2, [x20, #(INIT_ARGUMENTS_SP)]
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ldr x1, [x20, #(INIT_ARGUMENTS_ENTRYPOINT)]
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ldr x0, [x20, #(INIT_ARGUMENTS_ARGUMENT)]
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/* Set sctlr_el1 and ensure instruction consistency. */
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msr sctlr_el1, x3
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SETUP_SYSTEM_REGISTER(x3, sctlr_el1)
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dsb sy
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isb
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@ -271,6 +271,35 @@ _ZN3ams4kern4init14StartOtherCoreEPKNS1_14KInitArgumentsE:
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0: /* If we return here, something has gone wrong, so wait forever. */
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b 0b
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/* Nintendo places the metadata after StartOthercore. */
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.align 8
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__metadata_begin:
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__metadata_ini_offset:
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.quad 0 /* INI1 base address. */
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__metadata_kernelldr_offset:
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.quad 0 /* Kernel Loader base address. */
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__metadata_target_firmware:
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.word 0xCCCCCCCC /* Target firmware. */
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__metadata_kernel_layout:
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.word _start - __metadata_kernel_layout /* rx_offset */
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.word __rodata_start - __metadata_kernel_layout /* rx_end_offset */
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.word __rodata_start - __metadata_kernel_layout /* ro_offset */
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.word __data_start - __metadata_kernel_layout /* ro_end_offset */
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.word __data_start - __metadata_kernel_layout /* rw_offset */
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.word __bss_start__ - __metadata_kernel_layout /* rw_end_offset */
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.word __bss_start__ - __metadata_kernel_layout /* bss_offset */
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.word __bss_end__ - __metadata_kernel_layout /* bss_end_offset */
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.word __end__ - __metadata_kernel_layout /* resource_offset */
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.word _DYNAMIC - __metadata_kernel_layout /* dynamic_offset */
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.word __init_array_start - __metadata_kernel_layout /* init_array_offset */
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.word __init_array_end - __metadata_kernel_layout /* init_array_end_offset */
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.word __sysreg_constant_begin - __metadata_kernel_layout /* sysreg_offset */
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.if (. - __metadata_begin) != 0x48
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.error "Incorrect Mesosphere Metadata"
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.endif
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/* TODO: Can we remove this while retaining QEMU support? */
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#ifndef ATMOSPHERE_BOARD_NINTENDO_NX
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/* ams::kern::init::JumpFromEL2ToEL1() */
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@ -564,6 +593,24 @@ _ZN3ams4kern4arch5arm643cpu36FlushEntireDataCacheImplWithoutStackEv:
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ret
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/* System register values. */
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.align 8
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__sysreg_constant_begin:
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__sysreg_constant_ttbr0_el1:
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.quad 0 /* ttbr0_e11. */
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__sysreg_constant_ttbr1_el1:
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.quad 0 /* ttbr1_e11. */
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__sysreg_constant_tcr_el1:
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.quad 0 /* tcr_e11. */
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__sysreg_constant_mair_el1:
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.quad 0 /* mair_e11. */
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__sysreg_constant_sctlr_el1:
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.quad 0 /* sctlr_e11. */
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.if (. - __sysreg_constant_begin) != 0x28
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.error "Incorrect System Registers"
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.endif
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/* ================ Functions before this line remain identity-mapped after initialization finishes. ================ */
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/* ams::kern::init::IdentityMappedFunctionAreaEnd() */
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@ -116,13 +116,29 @@ _main:
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/* X0 is now the saved state. */
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/* We will return this to the kernel. */
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/* Return to the newly-relocated kernel. */
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/* Adjust return address to point to the relocated kernel. */
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ldr x1, [sp, #0x18] /* Return address to Kernel */
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ldr x2, [sp, #0x00] /* Relocated kernel base address diff. */
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add x1, x2, x1
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|
||||
/* Translate the relocated address back to a physical address. */
|
||||
and x4, x1, #0xFFF
|
||||
sub x3, x1, x4
|
||||
at s1e1r, x3
|
||||
isb
|
||||
mrs x3, par_el1
|
||||
1:
|
||||
tbnz w3, #0, 1b
|
||||
and x3, x3, #0xFFFFFFFFF000
|
||||
add x3, x3, x4
|
||||
|
||||
/* Return the difference between relocated and physical in x1. */
|
||||
sub x1, x1, x3
|
||||
|
||||
/* Setup stack, and return to the kernel. */
|
||||
ldr x2, [sp, #0x20]
|
||||
mov sp, x2
|
||||
br x1
|
||||
br x3
|
||||
|
||||
#ifdef ATMOSPHERE_BOARD_NINTENDO_NX
|
||||
.global _ZN3ams4kern17GetTargetFirmwareEv
|
||||
|
|
|
|||
|
|
@ -50,6 +50,25 @@ namespace ams::kern::init::loader {
|
|||
constinit void *g_final_state[2];
|
||||
|
||||
void RelocateKernelPhysically(uintptr_t &base_address, KernelLayout *&layout) {
|
||||
/* Adjust layout to be correct. */
|
||||
{
|
||||
const ptrdiff_t layout_offset = reinterpret_cast<uintptr_t>(layout) - base_address;
|
||||
layout->rx_offset += layout_offset;
|
||||
layout->rx_end_offset += layout_offset;
|
||||
layout->ro_offset += layout_offset;
|
||||
layout->ro_end_offset += layout_offset;
|
||||
layout->rw_offset += layout_offset;
|
||||
layout->rw_end_offset += layout_offset;
|
||||
layout->bss_offset += layout_offset;
|
||||
layout->bss_end_offset += layout_offset;
|
||||
layout->resource_offset += layout_offset;
|
||||
layout->dynamic_offset += layout_offset;
|
||||
layout->init_array_offset += layout_offset;
|
||||
layout->init_array_end_offset += layout_offset;
|
||||
layout->sysreg_offset += layout_offset;
|
||||
}
|
||||
|
||||
/* Relocate the kernel if necessary. */
|
||||
KPhysicalAddress correct_base = KSystemControl::Init::GetKernelPhysicalBaseAddress(base_address);
|
||||
if (correct_base != base_address) {
|
||||
const uintptr_t diff = GetInteger(correct_base) - base_address;
|
||||
|
|
@ -62,7 +81,7 @@ namespace ams::kern::init::loader {
|
|||
}
|
||||
}
|
||||
|
||||
void SetupInitialIdentityMapping(KInitialPageTable &init_pt, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageAllocator &allocator) {
|
||||
void SetupInitialIdentityMapping(KInitialPageTable &init_pt, uintptr_t base_address, uintptr_t kernel_size, uintptr_t page_table_region, size_t page_table_region_size, KInitialPageAllocator &allocator, KernelSystemRegisters *sysregs) {
|
||||
/* Map in an RWX identity mapping for the kernel. */
|
||||
constexpr PageTableEntry KernelRWXIdentityAttribute(PageTableEntry::Permission_KernelRWX, PageTableEntry::PageAttribute_NormalMemory, PageTableEntry::Shareable_InnerShareable, PageTableEntry::MappingFlag_Mapped);
|
||||
init_pt.Map(base_address, kernel_size, base_address, KernelRWXIdentityAttribute, allocator, 0);
|
||||
|
|
@ -96,9 +115,17 @@ namespace ams::kern::init::loader {
|
|||
|
||||
/* Setup SCTLR_EL1. */
|
||||
/* TODO: Define these bits properly elsewhere, document exactly what each bit set is doing .*/
|
||||
constexpr u64 SctlrValue = 0x0000000034D5D925ul;
|
||||
constexpr u64 SctlrValue = 0x0000000034D5D92Dul;
|
||||
cpu::SetSctlrEl1(SctlrValue);
|
||||
cpu::InstructionMemoryBarrier();
|
||||
|
||||
/* Setup the system registers for other cores. */
|
||||
/* NOTE: sctlr_el1 on other cores has the WXN bit set (0x80000); this will be set before KernelMain() on this core. */
|
||||
sysregs->ttbr0_el1 = init_pt.GetTtbr0L1TableAddress();
|
||||
sysregs->ttbr1_el1 = init_pt.GetTtbr1L1TableAddress();
|
||||
sysregs->tcr_el1 = TcrValue;
|
||||
sysregs->mair_el1 = MairValue;
|
||||
sysregs->sctlr_el1 = SctlrValue | 0x80000;
|
||||
}
|
||||
|
||||
KVirtualAddress GetRandomKernelBaseAddress(KInitialPageTable &page_table, KPhysicalAddress phys_base_address, size_t kernel_size) {
|
||||
|
|
@ -159,6 +186,7 @@ namespace ams::kern::init::loader {
|
|||
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;
|
||||
const uintptr_t sysreg_offset = layout->sysreg_offset;
|
||||
|
||||
/* Determine the size of the resource region. */
|
||||
const size_t resource_region_size = KMemoryLayout::GetResourceRegionSizeForInit(KSystemControl::Init::ShouldIncreaseThreadResourceLimit());
|
||||
|
|
@ -199,7 +227,7 @@ namespace ams::kern::init::loader {
|
|||
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, resource_end_address, InitialPageTableRegionSizeMax, g_initial_page_allocator);
|
||||
SetupInitialIdentityMapping(init_pt, base_address, bss_end_offset, resource_end_address, InitialPageTableRegionSizeMax, g_initial_page_allocator, reinterpret_cast<KernelSystemRegisters *>(base_address + sysreg_offset));
|
||||
|
||||
/* Generate a random slide for the kernel's base address. */
|
||||
const KVirtualAddress virtual_base_address = GetRandomKernelBaseAddress(init_pt, base_address, bss_end_offset);
|
||||
|
|
|
|||
Loading…
Reference in a new issue