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