144 lines
8.0 KiB
NASM
144 lines
8.0 KiB
NASM
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; Copyright Oliver Kowalke 2009.
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; Distributed under the Boost Software License, Version 1.0.
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; (See accompanying file LICENSE_1_0.txt or copy at
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; http://www.boost.org/LICENSE_1_0.txt)
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; ----------------------------------------------------------------------------------
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; | 0 | 1 | |
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; ----------------------------------------------------------------------------------
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; | 0x0 | 0x4 | |
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; ----------------------------------------------------------------------------------
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; | <indicator> | |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
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; ----------------------------------------------------------------------------------
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; | 0x8 | 0xc | 0x10 | 0x14 | 0x18 | 0x1c | 0x20 | 0x24 |
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; ----------------------------------------------------------------------------------
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; | SEE registers (XMM6-XMM15) |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 |
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; ----------------------------------------------------------------------------------
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; | 0x28 | 0x2c | 0x30 | 0x34 | 0x38 | 0x3c | 0x40 | 0x44 |
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; ----------------------------------------------------------------------------------
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; | SEE registers (XMM6-XMM15) |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 |
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; ----------------------------------------------------------------------------------
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; | 0x48 | 0x4c | 0x50 | 0x54 | 0x58 | 0x5c | 0x60 | 0x64 |
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; ----------------------------------------------------------------------------------
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; | SEE registers (XMM6-XMM15) |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 |
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; ----------------------------------------------------------------------------------
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; | 0x68 | 0x6c | 0x70 | 0x74 | 0x78 | 0x7c | 0x80 | 0x84 |
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; ----------------------------------------------------------------------------------
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; | SEE registers (XMM6-XMM15) |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 34 | 35 | 36 | 37 | 38 | 39 | 40 | 41 |
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; ----------------------------------------------------------------------------------
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; | 0x88 | 0x8c | 0x90 | 0x94 | 0x98 | 0x9c | 0xa0 | 0xa4 |
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; ----------------------------------------------------------------------------------
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; | SEE registers (XMM6-XMM15) |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 42 | 43 | 44 | 45 | 46 | 47 | 48 | 49 |
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; ----------------------------------------------------------------------------------
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; | 0xa8 | 0xac | 0xb0 | 0xb4 | 0xb8 | 0xbc | 0xc0 | 0xc4 |
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; ----------------------------------------------------------------------------------
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; | fc_mxcsr|fc_x87_cw| <alignment> | fbr_strg | fc_dealloc |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 |
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; ----------------------------------------------------------------------------------
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; | 0xc8 | 0xcc | 0xd0 | 0xd4 | 0xd8 | 0xdc | 0xe0 | 0xe4 |
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; ----------------------------------------------------------------------------------
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; | limit | base | R12 | R13 |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 |
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; ----------------------------------------------------------------------------------
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; | 0xe8 | 0xec | 0xf0 | 0xf4 | 0xf8 | 0xfc | 0x100 | 0x104 |
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; ----------------------------------------------------------------------------------
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; | R14 | R15 | RDI | RSI |
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; ----------------------------------------------------------------------------------
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; ----------------------------------------------------------------------------------
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; | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 |
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; ----------------------------------------------------------------------------------
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; | 0x108 | 0x10c | 0x110 | 0x114 | 0x118 | 0x11c | 0x120 | 0x124 |
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; ----------------------------------------------------------------------------------
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; | RBX | RBP | RIP | EXIT |
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; ----------------------------------------------------------------------------------
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; standard C library function
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EXTERN _exit:PROC
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.code
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; generate function table entry in .pdata and unwind information in
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make_fcontext PROC EXPORT FRAME
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; .xdata for a function's structured exception handling unwind behavior
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.endprolog
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; first arg of make_fcontext() == top of context-stack
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mov rax, rcx
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; reserve 32byte shadow-space for context-function
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sub rax, 028h
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; shift address in RAX to lower 16 byte boundary
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; == pointer to fcontext_t and address of context stack
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and rax, -16
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; reserve space for context-data on context-stack
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; size for fc_mxcsr .. RIP + return-address for context-function
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; on context-function entry: (RSP -0x8) % 16 == 0
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sub rax, 0128h
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; third arg of make_fcontext() == address of context-function
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mov [rax+0118h], r8
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; first arg of make_fcontext() == top of context-stack
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; save top address of context stack as 'base'
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mov [rax+0d0h], rcx
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; second arg of make_fcontext() == size of context-stack
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; negate stack size for LEA instruction (== substraction)
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neg rdx
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; compute bottom address of context stack (limit)
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lea rcx, [rcx+rdx]
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; save bottom address of context stack as 'limit'
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mov [rax+0c8h], rcx
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; save address of context stack limit as 'dealloction stack'
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mov [rax+0c0h], rcx
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; save MMX control- and status-word
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stmxcsr [rax+0a8h]
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; save x87 control-word
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fnstcw [rax+0ach]
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; compute abs address of label finish
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lea rcx, finish
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; save address of finish as return-address for context-function
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; will be entered after context-function returns
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mov [rax+0120h], rcx
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; set indicator
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mov rcx, 1
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mov [rax], rcx
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ret ; return pointer to context-data
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finish:
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; 32byte shadow-space for _exit() are
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; already reserved by make_fcontext()
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; exit code is zero
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xor rcx, rcx
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; exit application
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call _exit
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hlt
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make_fcontext ENDP
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END
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