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Atmosphere/mesosphere/kernel_ldr/source/arch/arm64/start.s

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4.4 KiB
ArmAsm

/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
#define cpuactlr_el1 s3_1_c15_c2_0
#define cpuectlr_el1 s3_1_c15_c2_1
#define LOAD_IMMEDIATE_32(reg, val) \
mov reg, #(((val) >> 0x00) & 0xFFFF); \
movk reg, #(((val) >> 0x10) & 0xFFFF), lsl#16
.section .crt0.text.start, "ax", %progbits
.global _start
_start:
b _main
__metadata_begin:
.ascii "MLD0" /* Magic */
__metadata_target_firmware:
.word 0xCCCCCCCC /* Target Firmware. */
__metadata_reserved:
.word 0xCCCCCCCC /* Reserved. */
_main:
/* KernelLdr_Main(uintptr_t kernel_base_address, KernelMap *kernel_map, uintptr_t ini1_base_address); */
adr x18, _start
adr x16, __external_references
ldr x17, [x16, #0x8] /* bss end */
ldr x16, [x16, #0x0] /* bss start */
add x16, x16, x18
add x17, x17, x18
clear_bss:
cmp x16, x17
b.cs clear_bss_done
str xzr, [x16],#0x8
b clear_bss
clear_bss_done:
adr x17, __external_references
ldr x17, [x17, #0x10] /* stack top */
add sp, x17, x18
/* Stack is now set up, so save important state. */
sub sp, sp, #0x30
stp x0, x1, [sp, #0x00]
stp x2, x30, [sp, #0x10]
stp xzr, xzr, [sp, #0x20]
/* Get the target firmware from exosphere. */
LOAD_IMMEDIATE_32(w0, 0xC3000004)
mov w1, #65000
smc #1
cmp x0, #0
0:
b.ne 0b
/* Store the target firmware. */
adr x0, __metadata_target_firmware
str w1, [x0]
/* Apply relocations and call init array for KernelLdr. */
adr x0, _start
adr x1, __external_references
ldr x1, [x1, #0x18] /* .dynamic. */
add x1, x0, x1
/* branch to ams::kern::init::Elf::ApplyRelocations(uintptr_t, const ams::kern::init::Elf::Elf64::Dyn *); */
bl _ZN3ams4kern4init3Elf16ApplyRelocationsEmPKNS2_5Elf643DynE
/* branch to ams::kern::init::Elf::CallInitArrayFuncs(uintptr_t, uintptr_t) */
adr x2, _start
adr x1, __external_references
ldr x0, [x1, #0x20] /* init_array_start */
ldr x1, [x1, #0x28] /* init_array_end */
add x0, x0, x2
add x1, x1, x2
bl _ZN3ams4kern4init3Elf18CallInitArrayFuncsEmm
/* Setup system registers, for detection of errors during init later. */
msr tpidr_el1, xzr /* Clear TPIDR_EL1 */
adr x0, __external_references
adr x1, _start
ldr x0, [x0, #0x30]
add x0, x1, x0
msr vbar_el1, x0
isb
/* Call ams::kern::init::loader::Main(uintptr_t, ams::kern::init::KernelLayout *, uintptr_t) */
ldp x0, x1, [sp, #0x00]
ldr x2, [sp, #0x10]
bl _ZN3ams4kern4init6loader4MainEmPNS1_12KernelLayoutEm
str x0, [sp, #0x00]
/* Get ams::kern::init::loader::AllocateKernelInitStack(). */
bl _ZN3ams4kern4init6loader23AllocateKernelInitStackEv
str x0, [sp, #0x20]
/* Call ams::kern::init::loader::GetFinalPageAllocatorState() */
bl _ZN3ams4kern4init6loader26GetFinalPageAllocatorStateEv
/* X0 is now the saved state for the page allocator. */
/* We will return this to the kernel. */
/* Return to the newly-relocated kernel. */
ldr x1, [sp, #0x18] /* Return address to Kernel */
ldr x2, [sp, #0x00] /* Relocated kernel base address diff. */
add x1, x2, x1
ldr x2, [sp, #0x20]
mov sp, x2
br x1
.global _ZN3ams4kern17GetTargetFirmwareEv
.type _ZN3ams4kern17GetTargetFirmwareEv, %function
_ZN3ams4kern17GetTargetFirmwareEv:
adr x0, __metadata_target_firmware
ldr w0, [x0]
ret
.balign 8
__external_references:
.quad __bss_start__ - _start
.quad __bss_end__ - _start
.quad __stack_end - _start
.quad _DYNAMIC - _start
.quad __init_array_start - _start
.quad __init_array_end - _start
.quad __vectors_start__ - _start