/* 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 | * * ----------------------------------------------------------------------------------- * * | EDI | ESI | EBX | EBP | EIP | hidden | to | data | * * ----------------------------------------------------------------------------------- * * * *****************************************************************************************/ .text .globl jump_fcontext .align 2 .type jump_fcontext,@function jump_fcontext: pushl %ebp /* save EBP */ pushl %ebx /* save EBX */ pushl %esi /* save ESI */ pushl %edi /* save EDI */ /* store fcontext_t in ECX */ movl %esp, %ecx /* first arg of jump_fcontext() == fcontext to jump to */ movl 0x18(%esp), %eax /* second arg of jump_fcontext() == data to be transferred */ movl 0x1c(%esp), %edx /* restore ESP (pointing to context-data) from EAX */ movl %eax, %esp /* address of returned transport_t */ movl 0x14(%esp), %eax /* return parent fcontext_t */ movl %ecx, (%eax) /* return data */ movl %edx, 0x4(%eax) popl %edi /* restore EDI */ popl %esi /* restore ESI */ popl %ebx /* restore EBX */ popl %ebp /* restore EBP */ /* jump to context */ ret $4 .size jump_fcontext,.-jump_fcontext /* Mark that we don't need executable stack. */ .section .note.GNU-stack,"",%progbits