forked from M-Labs/libfringe
41 lines
1012 B
ArmAsm
41 lines
1012 B
ArmAsm
// This file is part of libfringe, a low-level green threading library.
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// Copyright (c) 2015, edef <edef@edef.eu>
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// See the LICENSE file included in this distribution.
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//! initialise a new context
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//! arguments:
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//! * eax: stack pointer
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//! * ebx: function pointer
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//! * ecx: data pointer
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//!
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//! return values:
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//! * eax: new stack pointer
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// switch to the fresh stack
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xchg %esp, %eax
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// save the data pointer and the function pointer, respectively
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pushl %ecx
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pushl %ebx
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// save the return address, control flow continues at label 1
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call 1f
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// we arrive here once this context is reactivated (see swap.s)
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// restore the function pointer (the data pointer is the first argument, which lives at the top of the stack)
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popl %eax
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// initialise the frame pointer
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movl $$0, %ebp
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// call the function pointer with the data pointer (top of the stack is the first argument)
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call *%eax
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// crash if it ever returns
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ud2
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1:
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// save our neatly-setup new stack
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xchg %esp, %eax
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// back into Rust-land we go
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