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1 ##============================================================================= |
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2 ## |
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3 ## linux.S |
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4 ## |
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5 ## Linux setup |
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6 ## |
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7 ##============================================================================= |
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8 #####COPYRIGHTBEGIN#### |
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9 # |
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10 # ------------------------------------------- |
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11 # The contents of this file are subject to the Cygnus eCos Public License |
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12 # Version 1.0 (the "License"); you may not use this file except in |
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13 # compliance with the License. You may obtain a copy of the License at |
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14 # http://sourceware.cygnus.com/ecos |
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15 # |
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16 # Software distributed under the License is distributed on an "AS IS" |
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17 # basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the |
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18 # License for the specific language governing rights and limitations under |
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19 # the License. |
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20 # |
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21 # The Original Code is eCos - Embedded Cygnus Operating System, released |
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22 # September 30, 1998. |
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23 # |
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24 # The Initial Developer of the Original Code is Cygnus. Portions created |
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25 # by Cygnus are Copyright (C) 1998, 1999 Cygnus Solutions. |
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26 # All Rights Reserved. |
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27 # ------------------------------------------- |
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28 # |
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29 #####COPYRIGHTEND#### |
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30 ##============================================================================= |
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31 #######DESCRIPTIONBEGIN#### |
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32 ## |
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33 ## Author(s): jskov |
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34 ## Contributors:jskov |
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35 ## Date: 1999-03-11 |
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36 ## Purpose: Linux setup |
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37 ## Description: This file contains any code needed to initialize the |
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38 ## CPU on an i386/Linux synthetic target. |
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39 ## |
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40 ######DESCRIPTIONEND#### |
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41 ## |
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42 ##============================================================================= |
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43 |
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44 .globl cyg_hal_hardware_init |
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45 cyg_hal_hardware_init: |
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46 push %ebp |
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47 mov %esp,%ebp |
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48 sub $0x4,%esp |
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49 |
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50 ## FIXME: The below turns out to have no effect. At some point |
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51 ## before the cause_fpe test of signal2.c gets executes, the |
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52 ## flags have been reverted. Don't know what's causing it. Are |
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53 ## magic Linux calls required perhaps? |
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54 ## Maybe it is because a segv happens before the FPE.. |
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55 |
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56 ## Enable floating point exceptions. Bit mask: |
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57 ## 1 - invalid operation |
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58 ## 2 - denormalized operand |
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59 ## 4 - zero divide |
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60 ## 8 - overflow |
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61 ## 16 - underflow |
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62 ## 32 - precision |
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63 fstcw -4(%ebp) |
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64 movl -4(%ebp),%eax |
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65 andb $(~0x04),%al |
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66 movl %eax,-4(%ebp) |
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67 fldcw -4(%ebp) |
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68 |
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69 mov %ebp,%esp |
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70 pop %ebp |
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71 ret |
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72 |
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73 #------------------------------------------------------------------------------ |
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74 # end of linux.S |
