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93 lines
2.3 KiB
ArmAsm
93 lines
2.3 KiB
ArmAsm
##
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## This file is part of the "Coroutine" project and released under the MIT License.
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##
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## Created by Samuel Williams on 10/5/2018.
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## Copyright, 2018, by Samuel Williams.
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##
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#define TOKEN_PASTE(x,y) x##y
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#define PREFIXED_SYMBOL(prefix,name) TOKEN_PASTE(prefix,name)
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#if defined(__APPLE__)
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#define x29 fp
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#define x30 lr
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.text
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.p2align 2
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#else
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.text
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.align 2
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#endif
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## NOTE(PAC): Use we HINT mnemonics instead of PAC mnemonics to
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## keep compatibility with those assemblers that don't support PAC.
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##
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## See "Providing protection for complex software" for more details about PAC/BTI
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## https://developer.arm.com/architectures/learn-the-architecture/providing-protection-for-complex-software
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.global PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer)
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PREFIXED_SYMBOL(SYMBOL_PREFIX,coroutine_transfer):
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#if defined(__ARM_FEATURE_PAC_DEFAULT) && (__ARM_FEATURE_PAC_DEFAULT != 0)
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# paciasp (it also acts as BTI landing pad, so no need to insert BTI also)
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hint #25
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#elif defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT != 0)
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# For the the case PAC is not enabled but BTI is.
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# bti c
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hint #34
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#endif
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# Make space on the stack for caller registers
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sub sp, sp, 0xb0
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# Save caller registers
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stp d8, d9, [sp, 0x00]
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stp d10, d11, [sp, 0x10]
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stp d12, d13, [sp, 0x20]
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stp d14, d15, [sp, 0x30]
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stp x19, x20, [sp, 0x40]
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stp x21, x22, [sp, 0x50]
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stp x23, x24, [sp, 0x60]
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stp x25, x26, [sp, 0x70]
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stp x27, x28, [sp, 0x80]
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stp x29, x30, [sp, 0x90]
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# Save return address
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str x30, [sp, 0xa0]
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# Save stack pointer to x0 (first argument)
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mov x2, sp
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str x2, [x0, 0]
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# Load stack pointer from x1 (second argument)
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ldr x3, [x1, 0]
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mov sp, x3
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# Restore caller registers
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ldp d8, d9, [sp, 0x00]
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ldp d10, d11, [sp, 0x10]
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ldp d12, d13, [sp, 0x20]
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ldp d14, d15, [sp, 0x30]
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ldp x19, x20, [sp, 0x40]
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ldp x21, x22, [sp, 0x50]
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ldp x23, x24, [sp, 0x60]
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ldp x25, x26, [sp, 0x70]
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ldp x27, x28, [sp, 0x80]
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ldp x29, x30, [sp, 0x90]
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# Load return address into x17
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ldr x17, [sp, 0xa0]
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# Pop stack frame
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add sp, sp, 0xb0
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#if defined(__ARM_FEATURE_PAC_DEFAULT) && (__ARM_FEATURE_PAC_DEFAULT != 0)
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mov x16, sp
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# autia1716
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hint #12
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#endif
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# Jump to return address (in x17)
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ret x17
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#if defined(__linux__) && defined(__ELF__)
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.section .note.GNU-stack,"",%progbits
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#endif
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