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1/*
2            Copyright Oliver Kowalke 2009.
3   Distributed under the Boost Software License, Version 1.0.
4      (See accompanying file LICENSE_1_0.txt or copy at
5          http://www.boost.org/LICENSE_1_0.txt)
6*/
7
8/****************************************************************************************
9 *                                                                                      *
10 *  ----------------------------------------------------------------------------------  *
11 *  |    0    |    1    |    2    |    3    |    4     |    5    |    6    |    7    |  *
12 *  ----------------------------------------------------------------------------------  *
13 *  |   0x0   |   0x4   |   0x8   |   0xc   |   0x10   |   0x14  |   0x18  |   0x1c  |  *
14 *  ----------------------------------------------------------------------------------  *
15 *  | fc_mxcsr|fc_x87_cw|   EDI   |   ESI   |   EBX    |   EBP   |   EIP   |  hidden |  *
16 *  ----------------------------------------------------------------------------------  *
17 *  ----------------------------------------------------------------------------------  *
18 *  |    8    |    9    |    10   |    11   |    12    |    13   |    14   |    15   |  *
19 *  ----------------------------------------------------------------------------------  *
20 *  |   0x20  |   0x24  |                                                            |  *
21 *  ----------------------------------------------------------------------------------  *
22 *  |    to   |   data  |                                                            |  *
23 *  ----------------------------------------------------------------------------------  *
24 *                                                                                      *
25 ****************************************************************************************/
26
27.file "ontop_i386_sysv_elf_gas.S"
28.text
29.globl ontop_fcontext
30.align 2
31.type ontop_fcontext,@function
32ontop_fcontext:
33    leal  -0x18(%esp), %esp  /* prepare stack */
34
35#if !defined(BOOST_USE_TSX)
36    stmxcsr  (%esp)     /* save MMX control- and status-word */
37    fnstcw   0x4(%esp)  /* save x87 control-word */
38#endif
39
40    movl  %edi, 0x8(%esp)  /* save EDI */
41    movl  %esi, 0xc(%esp)  /* save ESI */
42    movl  %ebx, 0x10(%esp)  /* save EBX */
43    movl  %ebp, 0x14(%esp)  /* save EBP */
44
45    /* store ESP (pointing to context-data) in ECX */
46    movl  %esp, %ecx
47
48    /* first arg of ontop_fcontext() == fcontext to jump to */
49    movl  0x20(%esp), %eax
50
51    /* pass parent fcontext_t */
52    movl  %ecx, 0x20(%eax)
53
54    /* second arg of ontop_fcontext() == data to be transferred */
55    movl  0x24(%esp), %ecx
56
57    /* pass data */
58    movl %ecx, 0x24(%eax)
59
60    /* third arg of ontop_fcontext() == ontop-function */
61    movl  0x28(%esp), %ecx
62
63    /* restore ESP (pointing to context-data) from EAX */
64    movl  %eax, %esp
65
66    /* address of returned transport_t */
67    movl 0x1c(%esp), %eax
68    /* return parent fcontext_t */
69    movl  %ecx, (%eax)
70    /* return data */
71    movl %edx, 0x4(%eax)
72
73#if !defined(BOOST_USE_TSX)
74    ldmxcsr  (%esp)     /* restore MMX control- and status-word */
75    fldcw    0x4(%esp)  /* restore x87 control-word */
76#endif
77
78    movl  0x8(%esp), %edi  /* restore EDI */
79    movl  0xc(%esp), %esi  /* restore ESI */
80    movl  0x10(%esp), %ebx  /* restore EBX */
81    movl  0x14(%esp), %ebp  /* restore EBP */
82
83    leal  0x18(%esp), %esp  /* prepare stack */
84
85    /* jump to context */
86    jmp *%ecx
87.size ontop_fcontext,.-ontop_fcontext
88
89/* Mark that we don't need executable stack.  */
90.section .note.GNU-stack,"",%progbits
91