projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
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 | ||
| b32b8144 FG |
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 | ****************************************************************************************/ | |
| 7c673cae | 26 | |
| 92f5a8d4 | 27 | .file "ontop_i386_sysv_elf_gas.S" |
| 7c673cae FG |
28 | .text |
| 29 | .globl ontop_fcontext | |
| 30 | .align 2 | |
| 31 | .type ontop_fcontext,@function | |
| 32 | ontop_fcontext: | |
| b32b8144 | 33 | leal -0x18(%esp), %esp /* prepare stack */ |
| 7c673cae | 34 | |
| b32b8144 FG |
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 */ | |
| 7c673cae FG |
46 | movl %esp, %ecx |
| 47 | ||
| 48 | /* first arg of ontop_fcontext() == fcontext to jump to */ | |
| b32b8144 | 49 | movl 0x20(%esp), %eax |
| 7c673cae FG |
50 | |
| 51 | /* pass parent fcontext_t */ | |
| b32b8144 | 52 | movl %ecx, 0x20(%eax) |
| 7c673cae FG |
53 | |
| 54 | /* second arg of ontop_fcontext() == data to be transferred */ | |
| b32b8144 | 55 | movl 0x24(%esp), %ecx |
| 7c673cae FG |
56 | |
| 57 | /* pass data */ | |
| b32b8144 | 58 | movl %ecx, 0x24(%eax) |
| 7c673cae FG |
59 | |
| 60 | /* third arg of ontop_fcontext() == ontop-function */ | |
| b32b8144 | 61 | movl 0x28(%esp), %ecx |
| 7c673cae | 62 | |
| b32b8144 | 63 | /* restore ESP (pointing to context-data) from EAX */ |
| 7c673cae FG |
64 | movl %eax, %esp |
| 65 | ||
| b32b8144 FG |
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 */ | |
| 7c673cae FG |
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 |