/* Copyright Oliver Kowalke 2009. Copyright Thomas Sailer 2013. 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 | * ---------------------------------------------------------------------------------- * * * *************************************************************************************/ .file "make_x86_64_ms_pe_gas.asm" .text .p2align 4,,15 .globl make_fcontext .def make_fcontext; .scl 2; .type 32; .endef .seh_proc make_fcontext make_fcontext: .seh_endprologue /* first arg of make_fcontext() == top of context-stack */ movq %rcx, %rax /* reserve 32byte shadow-space for context-function */ leaq -0x28(%rax), %rax /* shift address in RAX to lower 16 byte boundary */ /* == pointer to fcontext_t and address of context stack */ andq $-16, %rax /* 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 */ leaq -0x128(%rax), %rax /* third arg of make_fcontext() == address of context-function */ movq %r8, 0x118(%rax) /* first arg of make_fcontext() == top of context-stack */ /* save top address of context stack as 'base' */ movq %rcx, 0xd0(%rax) /* second arg of make_fcontext() == size of context-stack */ /* negate stack size for LEA instruction (== substraction) */ negq %rdx /* compute bottom address of context stack (limit) */ leaq (%rcx,%rdx), %rcx /* save bottom address of context stack as 'limit' */ movq %rcx, 0xc8(%rax) /* save address of context stack limit as 'dealloction stack' */ movq %rcx, 0xc0(%rax) /* save MMX control- and status-word */ stmxcsr 0xa8(%rax) /* save x87 control-word */ fnstcw 0xac(%rax) /* compute abs address of label finish */ leaq finish(%rip), %rcx /* save address of finish as return-address for context-function */ /* will be entered after context-function returns */ movq %rcx, 0x120(%rax) /* set indicator */ movq 1, %rcx movq %rcx, (%rax) ret /* return pointer to context-data */ finish: /* 32byte shadow-space for _exit() are */ /* already reserved by make_fcontext() */ /* exit code is zero */ xorq %rcx, %rcx /* exit application */ call _exit hlt .seh_endproc .def _exit; .scl 2; .type 32; .endef /* standard C library function */