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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 | *
* ---------------------------------------------------------------------------------- *
* | fc_mxcsr|fc_x87_cw| EDI | ESI | EBX | EBP | EIP | to | *
* ---------------------------------------------------------------------------------- *
* ---------------------------------------------------------------------------------- *
* | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | *
* ---------------------------------------------------------------------------------- *
* | 0x20 | | *
* ---------------------------------------------------------------------------------- *
* | data | | *
* ---------------------------------------------------------------------------------- *
* *
****************************************************************************************/
.text
.globl _jump_fcontext
.align 2
_jump_fcontext:
leal -0x18(%esp), %esp /* prepare stack */
#if !defined(BOOST_USE_TSX)
stmxcsr (%esp) /* save MMX control- and status-word */
fnstcw 0x4(%esp) /* save x87 control-word */
#endif
movl %edi, 0x8(%esp) /* save EDI */
movl %esi, 0xc(%esp) /* save ESI */
movl %ebx, 0x10(%esp) /* save EBX */
movl %ebp, 0x14(%esp) /* save EBP */
/* store ESP (pointing to context-data) in ECX */
movl %esp, %ecx
/* first arg of jump_fcontext() == fcontext to jump to */
movl 0x1c(%esp), %eax
/* second arg of jump_fcontext() == data to be transferred */
movl 0x20(%esp), %edx
/* restore ESP (pointing to context-data) from EAX */
movl %eax, %esp
/* return parent fcontext_t */
movl %ecx, %eax
/* returned data is stored in EDX */
movl 0x18(%esp), %ecx /* restore EIP */
#if !defined(BOOST_USE_TSX)
ldmxcsr (%esp) /* restore MMX control- and status-word */
fldcw 0x4(%esp) /* restore x87 control-word */
#endif
movl 0x8(%esp), %edi /* restore EDI */
movl 0xc(%esp), %esi /* restore ESI */
movl 0x10(%esp), %ebx /* restore EBX */
movl 0x14(%esp), %ebp /* restore EBP */
leal 0x1c(%esp), %esp /* prepare stack */
/* jump to context */
jmp *%ecx
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