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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)
; ----------------------------------------------------------------------------------
; | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
; ----------------------------------------------------------------------------------
; | 0x0 | 0x4 | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c |
; ----------------------------------------------------------------------------------
; | SEE registers (XMM6-XMM15) |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
; ----------------------------------------------------------------------------------
; | 0x20 | 0x24 | 0x28 | 0x2c | 0x30 | 0x34 | 0x38 | 0x3c |
; ----------------------------------------------------------------------------------
; | SEE registers (XMM6-XMM15) |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
; ----------------------------------------------------------------------------------
; | 0xe40 | 0x44 | 0x48 | 0x4c | 0x50 | 0x54 | 0x58 | 0x5c |
; ----------------------------------------------------------------------------------
; | SEE registers (XMM6-XMM15) |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
; ----------------------------------------------------------------------------------
; | 0x60 | 0x64 | 0x68 | 0x6c | 0x70 | 0x74 | 0x78 | 0x7c |
; ----------------------------------------------------------------------------------
; | SEE registers (XMM6-XMM15) |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 32 | 32 | 33 | 34 | 35 | 36 | 37 | 38 |
; ----------------------------------------------------------------------------------
; | 0x80 | 0x84 | 0x88 | 0x8c | 0x90 | 0x94 | 0x98 | 0x9c |
; ----------------------------------------------------------------------------------
; | SEE registers (XMM6-XMM15) |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 |
; ----------------------------------------------------------------------------------
; | 0xa0 | 0xa4 | 0xa8 | 0xac | 0xb0 | 0xb4 | 0xb8 | 0xbc |
; ----------------------------------------------------------------------------------
; | fc_mxcsr|fc_x87_cw| <alignment> | fbr_strg | fc_dealloc |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 |
; ----------------------------------------------------------------------------------
; | 0xc0 | 0xc4 | 0xc8 | 0xcc | 0xd0 | 0xd4 | 0xd8 | 0xdc |
; ----------------------------------------------------------------------------------
; | limit | base | R12 | R13 |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 |
; ----------------------------------------------------------------------------------
; | 0xe0 | 0xe4 | 0xe8 | 0xec | 0xf0 | 0xf4 | 0xf8 | 0xfc |
; ----------------------------------------------------------------------------------
; | R14 | R15 | RDI | RSI |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 |
; ----------------------------------------------------------------------------------
; | 0x100 | 0x104 | 0x108 | 0x10c | 0x110 | 0x114 | 0x118 | 0x11c |
; ----------------------------------------------------------------------------------
; | RBX | RBP | hidden | RIP |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 71 | 72 | 73 | 74 | 75 | 76 | 77 | 78 |
; ----------------------------------------------------------------------------------
; | 0x120 | 0x124 | 0x128 | 0x12c | 0x130 | 0x134 | 0x138 | 0x13c |
; ----------------------------------------------------------------------------------
; | parameter area |
; ----------------------------------------------------------------------------------
; ----------------------------------------------------------------------------------
; | 79 | 80 | 81 | 82 | 83 | 84 | 85 | 86 |
; ----------------------------------------------------------------------------------
; | 0x140 | 0x144 | 0x148 | 0x14c | 0x150 | 0x154 | 0x158 | 0x15c |
; ----------------------------------------------------------------------------------
; | FCTX | DATA | |
; ----------------------------------------------------------------------------------
; 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, 0150h
; third arg of make_fcontext() == address of context-function
; stored in RBX
mov [rax+0100h], r8
; first arg of make_fcontext() == top of context-stack
; save top address of context stack as 'base'
mov [rax+0c8h], 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+0c0h], rcx
; save address of context stack limit as 'dealloction stack'
mov [rax+0b8h], rcx
; set fiber-storage to zero
xor rcx, rcx
mov [rax+0b0h], rcx
; save MMX control- and status-word
stmxcsr [rax+0a0h]
; save x87 control-word
fnstcw [rax+0a4h]
; compute address of transport_t
lea rcx, [rax+0140h]
; store address of transport_t in hidden field
mov [rax+0110h], rcx
; compute abs address of label trampoline
lea rcx, trampoline
; save address of trampoline as return-address for context-function
; will be entered after calling jump_fcontext() first time
mov [rax+0118h], rcx
; compute abs address of label finish
lea rcx, finish
; save address of finish as return-address for context-function in RBP
; will be entered after context-function returns
mov [rax+0108h], rcx
ret ; return pointer to context-data
trampoline:
; store return address on stack
; fix stack alignment
push rbp
; jump to context-function
jmp rbx
finish:
; exit code is zero
xor rcx, rcx
; exit application
call _exit
hlt
make_fcontext ENDP
END
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