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47 lines
925 B
ArmAsm
47 lines
925 B
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 Lars Kanis on 06/06/2019.
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##
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.text
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# Using fastcall is a big win (and it's the same as how x64 works).
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# In coroutine transfer, the arguments are passed in ecx and edx. We don't need
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# to touch these in order to pass them to the destination coroutine.
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.globl @coroutine_transfer@8
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@coroutine_transfer@8:
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# Save the thread information block:
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pushl %fs:0
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pushl %fs:4
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pushl %fs:8
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# Save caller registers:
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pushl %ebp
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pushl %ebx
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pushl %edi
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pushl %esi
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# Save caller stack pointer:
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movl %esp, (%ecx)
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# Restore callee stack pointer:
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movl (%edx), %esp
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# Restore callee stack:
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popl %esi
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popl %edi
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popl %ebx
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popl %ebp
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# Restore the thread information block:
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popl %fs:8
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popl %fs:4
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popl %fs:0
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# Save the first argument as the return value:
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movl %ecx, %eax
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# Jump to the address on the stack:
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ret
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