2019-12-12 22:38:11 +01:00
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/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* For some reason GAS doesn't know about it, even with .cpu cortex-a57 */
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#define cpuactlr_el1 s3_1_c15_c2_0
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#define cpuectlr_el1 s3_1_c15_c2_1
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.section .crt0.text.start, "ax", %progbits
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.global _start
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_start:
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2019-12-13 10:21:43 +01:00
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/* KernelLdr_Main(uintptr_t kernel_base_address, KernelMap *kernel_map, uintptr_t ini1_base_address); */
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adr x18, _start
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adr x16, __external_references
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ldr x17, [x16, #0x8] /* bss end */
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ldr x16, [x16, #0x0] /* bss start */
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add x16, x16, x18
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add x17, x17, x18
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clear_bss:
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cmp x16, x17
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b.cs clear_bss_done
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str xzr, [x16],#0x8
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b clear_bss
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clear_bss_done:
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adr x17, __external_references
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ldr x17, [x17, #0x10] /* stack top */
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add sp, x17, x18
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/* Stack is now set up. */
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/* Apply relocations and call init array for KernelLdr. */
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sub sp, sp, #0x20
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stp x0, x1, [sp, #0x00]
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stp x2, x30, [sp, #0x10]
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adr x0, _start
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adr x1, __external_references
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ldr x1, [x1, #0x18] /* .dynamic. */
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add x1, x0, x1
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/* branch to ams::kern::init::Elf::Elf64::ApplyRelocations(uintptr_t, const ams::kern::init::Elf::Elf64::Dyn *); */
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bl _ZN3ams4kern4init3Elf5Elf6416ApplyRelocationsEmPKNS3_3DynE
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/* branch to ams::kern::init::Elf::Elf64::CallInitArrayFuncs(uintptr_t, uintptr_t) */
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adr x2, _start
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adr x1, __external_references
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ldr x0, [x1, #0x20] /* init_array_start */
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ldr x1, [x1, #0x28] /* init_array_end */
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add x0, x0, x2
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add x1, x1, x2
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bl _ZN3ams4kern4init3Elf5Elf6418CallInitArrayFuncsEmm
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/* Setup system registers, for detection of errors during init later. */
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msr tpidr_el1, xzr /* Clear TPIDR_EL1 */
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adr x0, __external_references
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adr x1, _start
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ldr x0, [x0, #0x30]
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add x0, x1, x0
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msr vbar_el1, x0
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isb
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/* Call ams::kern::init::loader::Main(uintptr_t, ams::kern::init::KernelLayout *, uintptr_t) */
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ldp x0, x1, [sp, #0x00]
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ldr x2, [sp, #0x10]
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bl _ZN3ams4kern4init6loader4MainEmPNS1_12KernelLayoutEm
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str x0, [sp, #0x00]
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/* Call ams::kern::init::loader::Finalize() */
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bl _ZN3ams4kern4init6loader8FinalizeEv
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/* Return to the newly-relocated kernel. */
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ldr x1, [sp, #0x18] /* Return address to Kernel */
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2019-12-17 09:37:55 +01:00
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ldr x2, [sp, #0x00] /* Relocated kernel base address diff. */
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2019-12-13 10:21:43 +01:00
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add x1, x2, x1
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br x1
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__external_references:
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.quad __bss_start__ - _start
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.quad __bss_end__ - _start
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.quad __stack_end - _start
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2019-12-13 21:41:19 +01:00
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.quad _DYNAMIC - _start
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2019-12-13 10:21:43 +01:00
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.quad __init_array_start - _start
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.quad __init_array_end - _start
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.quad __vectors_start__ - _start
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