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annotate packages/hal/synth/i386linux/current/src/vectors.S @ 2901:b64cee69f7e3

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Add TLS support to avoid problems with gcc -fstack-protector
author bartv
date Tue, 11 Aug 2009 16:00:29 +0000
parents 74dbf4c3f2e1
children
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1 ##=============================================================================
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2 ##
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3 ## vectors.S
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4 ##
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5 ## x86 exception vectors
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6 ##
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7 ##=============================================================================
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8 ## ####ECOSGPLCOPYRIGHTBEGIN####
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9 ## -------------------------------------------
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10 ## This file is part of eCos, the Embedded Configurable Operating System.
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11 ## Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 ##
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13 ## eCos is free software; you can redistribute it and/or modify it under
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14 ## the terms of the GNU General Public License as published by the Free
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15 ## Software Foundation; either version 2 or (at your option) any later
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16 ## version.
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17 ##
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18 ## eCos is distributed in the hope that it will be useful, but WITHOUT
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19 ## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 ## for more details.
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22 ##
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23 ## You should have received a copy of the GNU General Public License
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24 ## along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 ##
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27 ## As a special exception, if other files instantiate templates or use
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28 ## macros or inline functions from this file, or you compile this file
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29 ## and link it with other works to produce a work based on this file,
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30 ## this file does not by itself cause the resulting work to be covered by
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31 ## the GNU General Public License. However the source code for this file
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32 ## must still be made available in accordance with section (3) of the GNU
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33 ## General Public License v2.
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34 ##
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35 ## This exception does not invalidate any other reasons why a work based
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36 ## on this file might be covered by the GNU General Public License.
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37 ## -------------------------------------------
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38 ## ####ECOSGPLCOPYRIGHTEND####
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39 ##=============================================================================
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40 #######DESCRIPTIONBEGIN####
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41 ##
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42 ## Author(s): bartv
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43 ## Contributors:bartv
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44 ## Date: 2001-03-16
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45 ## Purpose: Synthetic target startup
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46 ## Description: When running on real hardware vectors.S contains
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47 ## initialization code and usually the low-level interrupt and
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48 ## exception support. On the synthetic target the latter is
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49 ## handled by C code. The main initialization that is needed is
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50 ## to jump into the C startup.
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51 ##
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52 ######DESCRIPTIONEND####
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53 ##
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54 ##=============================================================================
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55
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56 # According the SVR4/i386 ABI, most registers are undefined. However
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57 # there is some interesting information on the stack:
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58 # %esp argc
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59 # %esp+4 argv[0]
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60 # ... argv[1 onwards]
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61 # %esp + (argc*4) NULL
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62 # ... environ[0]
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63 # ... ...
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64 # ... NULL
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65 #
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66 # There are some other things that could be done, for example aligning
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67 # the stack to a 16-byte boundary for SSE, but it is not clear which of
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68 # those things are actually useful. The glibc source file
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69 # sysdeps/i386/elf/start.S contains some relevant information.
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70
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71 #==============================================================================
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72
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73 .file "vectors.S"
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74
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75 .extern _hal_synth_user_desc
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76 .extern _linux_entry
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77
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78 .data
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79 .global cyg_hal_sys_argc
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80 cyg_hal_sys_argc:
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81 .long 0
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82 .global cyg_hal_sys_argv
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83 cyg_hal_sys_argv:
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84 .long 0
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85 .global cyg_hal_sys_environ
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86 cyg_hal_sys_environ:
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87 .long 0
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88
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89 .text
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90 .globl _start
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91 _start:
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92 popl %eax
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93 movl %eax, cyg_hal_sys_argc
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94 movl %esp, %ebx
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95 movl %ebx, cyg_hal_sys_argv
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96 inc %eax
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97 addl %eax, %eax
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98 addl %eax, %eax
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99 addl %eax, %ebx
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100 movl %ebx, cyg_hal_sys_environ
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101
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102 // Clear the frame pointer, to facilitate debugging
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103 xorl %ebp, %ebp
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104
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105 // Align the stack to a 16-byte boundary.
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106 andl $0xFFFFFFF0, %esp
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107
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108 // Set up the TLS section. This must be done before any
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109 // C code gets to run, or -fstack-protector-all will fail.
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110
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111 // _hal_synth_user_desc is statically initialized in tls.c
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112 movl $_hal_synth_user_desc,%ebx
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113 // Syscall 243, set_thread_area
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114 movl $0xf3, %eax
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115 int $0x80
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116
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117 // The syscall may have failed. That should only happen if running
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118 // on an old kernel which predates set_thread_area(), in which case
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119 // we are probably also using an old gcc which does not yet support
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120 // -fstack-protector. There is no obvious way forward if we are trying
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121 // to run an executable built with recent gcc on an old kernel.
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122 test %eax, %eax
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123 jne 1f
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124
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125 // gs value = (_hal_synth_user_desc.ud_entry_number * 8) + 3
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126 movl _hal_synth_user_desc,%eax
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127 lea 0x3(,%eax,8),%eax
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128 mov %eax,%gs
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129
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130 1:
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131 jmp _linux_entry