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annotate packages/hal/synth/i386linux/current/src/vectors.S @ 260:922ca26d90c4

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Add variables cyg_hal_sys_argc/argv/environ, corresponding to the arguments and environment vector passed to the synthetic target application.
author bartv
date Sun, 04 Aug 2002 23:18:58 +0000
parents d2c90368aeef
children 74dbf4c3f2e1
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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 Red Hat, 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 version.
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16 ##
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17 ## eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 ## WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 ## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 ## for more details.
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21 ##
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22 ## You should have received a copy of the GNU General Public License along
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23 ## with eCos; if not, write to the Free Software Foundation, Inc.,
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24 ## 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 ##
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26 ## As a special exception, if other files instantiate templates or use macros
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27 ## or inline functions from this file, or you compile this file and link it
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28 ## with other works to produce a work based on this file, this file does not
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29 ## by itself cause the resulting work to be covered by the GNU General Public
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30 ## License. However the source code for this file must still be made available
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31 ## in accordance with section (3) of the GNU General Public License.
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32 ##
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33 ## This exception does not invalidate any other reasons why a work based on
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34 ## this file might be covered by the GNU General Public License.
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35 ##
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36 ## Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 ## at http://sources.redhat.com/ecos/ecos-license/
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38 ## -------------------------------------------
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39 #####ECOSGPLCOPYRIGHTEND####
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40 ##=============================================================================
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41 #######DESCRIPTIONBEGIN####
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42 ##
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43 ## Author(s): bartv
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44 ## Contributors:bartv
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45 ## Date: 2001-03-16
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46 ## Purpose: Synthetic target startup
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47 ## Description: When running on real hardware vectors.S contains
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48 ## initialization code and usually the low-level interrupt and
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49 ## exception support. On the synthetic target the latter is
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50 ## handled by C code. The main initialization that is needed is
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51 ## to jump into the C startup.
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52 ##
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53 ######DESCRIPTIONEND####
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54 ##
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55 ##=============================================================================
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56
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57 # According the SVR4/i386 ABI, most registers are undefined. However
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58 # there is some interesting information on the stack:
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59 # %esp argc
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60 # %esp+4 argv[0]
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61 # ... argv[1 onwards]
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62 # %esp + (argc*4) NULL
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63 # ... environ[0]
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64 # ... ...
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65 # ... NULL
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66 #
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67 # There are some other things that could be done, for example aligning
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68 # the stack to a 16-byte boundary for SSE, but it is not clear which of
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69 # those things are actually useful. The glibc source file
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70 # sysdeps/i386/elf/start.S contains some relevant information.
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72 #==============================================================================
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73
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74 .file "vectors.S"
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75
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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 jmp _linux_entry