; 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 | ; ---------------------------------------------------------------------------------- ; | R12 | R13 | R14 | R15 | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | ; ---------------------------------------------------------------------------------- ; | 0x20 | 0x24 | 0x28 | 0x2c | 0x30 | 0x34 | 0x38 | 0x3c | ; ---------------------------------------------------------------------------------- ; | RDI | RSI | RBX | RBP | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 16 | 17 | 18 | 19 | | ; ---------------------------------------------------------------------------------- ; | 0x40 | 0x44 | 0x48 | 0x4c | | ; ---------------------------------------------------------------------------------- ; | RSP | RIP | | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 20 | 21 | 22 | 23 | 24 | 25 | | ; ---------------------------------------------------------------------------------- ; | 0x50 | 0x54 | 0x58 | 0x5c | 0x60 | 0x64 | | ; ---------------------------------------------------------------------------------- ; | sp | size | limit | | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 26 | 27 | | ; ---------------------------------------------------------------------------------- ; | 0x68 | 0x6c | | ; ---------------------------------------------------------------------------------- ; | fbr_strg | | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | ; ---------------------------------------------------------------------------------- ; | 0x70 | 0x74 | 0x78 | 0x7c | 0x80 | 0x84 | 0x88 | 0x8c | ; ---------------------------------------------------------------------------------- ; | fc_mxcsr|fc_x87_cw| fc_xmm | SEE registers (XMM6-XMM15) | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 36 | 37 | 38 | 39 | 40 | 41 | 42 | 43 | ; ---------------------------------------------------------------------------------- ; | 0x90 | 0x94 | 0x98 | 0x9c | 0xa0 | 0xa4 | 0xa8 | 0xac | ; ---------------------------------------------------------------------------------- ; | SEE registers (XMM6-XMM15) | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | ; ---------------------------------------------------------------------------------- ; | 0xb0 | 0xb4 | 0xb8 | 0xbc | 0xc0 | 0xc4 | 0xc8 | 0xcc | ; ---------------------------------------------------------------------------------- ; | SEE registers (XMM6-XMM15) | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | ; ---------------------------------------------------------------------------------- ; | 0xd0 | 0xd4 | 0xd8 | 0xdc | 0xe0 | 0xe4 | 0xe8 | 0xec | ; ---------------------------------------------------------------------------------- ; | SEE registers (XMM6-XMM15) | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | ; ---------------------------------------------------------------------------------- ; | 0xf0 | 0xf4 | 0xf8 | 0xfc | 0x100 | 0x104 | 0x108 | 0x10c | ; ---------------------------------------------------------------------------------- ; | SEE registers (XMM6-XMM15) | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | ; ---------------------------------------------------------------------------------- ; | 0x110 | 0x114 | 0x118 | 0x11c | 0x120 | 0x124 | 0x128 | 0x12c | ; ---------------------------------------------------------------------------------- ; | SEE registers (XMM6-XMM15) | ; ---------------------------------------------------------------------------------- ; ---------------------------------------------------------------------------------- ; | 76 | 77 | | ; ---------------------------------------------------------------------------------- ; | 0x130 | 0x134 | | ; ---------------------------------------------------------------------------------- ; | fc_dealloc | | ; ---------------------------------------------------------------------------------- EXTERN _exit:PROC ; standard C library function .code make_fcontext PROC EXPORT FRAME ; generate function table entry in .pdata and unwind information in .endprolog ; .xdata for a function's structured exception handling unwind behavior lea rax, [rcx-0138h] ; reserve space for fcontext_t at top of context stack ; shift address in RAX to lower 16 byte boundary ; == pointer to fcontext_t and address of context stack and rax, -16 mov [rax+048h], r8 ; save address of context function in fcontext_t mov [rax+058h], rdx ; save context stack size in fcontext_t mov [rax+050h], rcx ; save address of context stack pointer (base) in fcontext_t neg rdx ; negate stack size for LEA instruction (== substraction) lea rcx, [rcx+rdx] ; compute bottom address of context stack (limit) mov [rax+060h], rcx ; save bottom address of context stack (limit) in fcontext_t mov [rax+0130h], rcx ; save address of context stack limit as 'dealloction stack' stmxcsr [rax+070h] ; save MMX control and status word fnstcw [rax+074h] ; save x87 control word lea rdx, [rax-028h] ; reserve 32byte shadow space + return address on stack, (RSP - 0x8) % 16 == 0 mov [rax+040h], rdx ; save address in RDX as stack pointer for context function lea rcx, finish ; compute abs address of label finish mov [rdx], rcx ; save address of finish as return address for context function ; entered after context function returns ret finish: ; RSP points to same address as RSP on entry of context function + 0x8 xor rcx, rcx ; exit code is zero call _exit ; exit application hlt make_fcontext ENDP END