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make_x86_64_ms_pe_masm.asm 5.41 KB
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Add custom 'fast fiber call' implementation to comparison.
5b791d0e
 
FritzFlorian committed
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;           Copyright Oliver Kowalke 2009.
;  Distributed under the Boost Software License, Version 1.0.
;     (See accompanying file LICENSE_1_0.txt or copy at
;           http://www.boost.org/LICENSE_1_0.txt)

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; standard C library function
EXTERN  _exit:PROC
.code

; generate function table entry in .pdata and unwind information in
make_fcontext PROC BOOST_CONTEXT_EXPORT FRAME
    ; .xdata for a function's structured exception handling unwind behavior
    .endprolog

    ; first arg of make_fcontext() == top of context-stack
    mov  rax, rcx

    ; shift address in RAX to lower 16 byte boundary
    ; == pointer to fcontext_t and address of context stack
    and  rax, -16

    ; reserve space for context-data on context-stack
    ; on context-function entry: (RSP -0x8) % 16 == 0
    sub  rax, 0b8h

    ; third arg of make_fcontext() == address of context-function
    mov  [rax+068h], r8

    ; first arg of make_fcontext() == top of context-stack
    ; save top address of context stack as 'base'
    mov  [rax+018h], rcx
    ; second arg of make_fcontext() == size of context-stack
    ; negate stack size for LEA instruction (== substraction)
    neg  rdx
    ; compute bottom address of context stack (limit)
    lea  rcx, [rcx+rdx]
    ; save bottom address of context stack as 'limit'
    mov  [rax+010h], rcx
    ; save address of context stack limit as 'dealloction stack'
    mov  [rax+08h], rcx

    ; compute address of transport_t
    lea rcx, [rax+098h]
    ; store address of transport_t in hidden field
    mov [rax+060h], rcx

    ; compute abs address of label finish
    lea  rcx, finish
    ; save address of finish as return-address for context-function
    ; will be entered after context-function returns
    mov  [rax+070h], rcx

    ret ; return pointer to context-data

finish:
    ; exit code is zero
    xor  rcx, rcx
    ; exit application
    call  _exit
    hlt
make_fcontext ENDP
END