4.104.114.84.95
Last change
on this file since 1bfedfe was
173fd7c,
checked in by Ralf Corsepius <ralf.corsepius@…>, on 04/01/04 at 10:08:08
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2004-04-01 Ralf Corsepius <ralf_corsepius@…>
- reg_win/window.S: Include <rtems/asm.h> instead of <asm.h>.
- syscall/syscall.S: Include <rtems/asm.h> instead of <asm.h>.
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-
Property mode set to
100644
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File size:
1.4 KB
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Line | |
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1 | /* |
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2 | * systrap.S |
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3 | * |
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4 | * This file contains emulated system calls using software trap 0. |
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5 | * The following calls are supported: |
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6 | * |
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7 | * + SYS_exit (halt) |
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8 | * + SYS_irqdis (disable interrupts) |
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9 | * + SYS_irqset (set interrupt level) |
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10 | * |
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11 | * COPYRIGHT: |
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12 | * |
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13 | * COPYRIGHT (c) 1995. European Space Agency. |
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14 | * |
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15 | * This terms of the RTEMS license apply to this file. |
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16 | * |
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17 | */ |
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18 | |
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19 | #include <rtems/asm.h> |
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20 | #include "syscall.h" |
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21 | |
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22 | .seg "text" |
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23 | /* |
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24 | * system call |
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25 | * |
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26 | * On entry: |
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27 | * |
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28 | * l0 = psr (from trap table) |
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29 | * l1 = pc |
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30 | * l2 = npc |
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31 | * g1 = system call id |
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32 | */ |
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33 | |
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34 | PUBLIC(syscall) |
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35 | |
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36 | SYM(syscall): |
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37 | |
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38 | subcc %g1, 2, %g0 ! syscall 2, disable interrupts |
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39 | bne 3f |
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40 | or %l0, 0x0f00, %l4 ! set PIL=15 |
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41 | mov %l4, %psr |
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42 | or %l0, SPARC_PSR_ET_MASK, %i0 ! return old psr with ET=1 |
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43 | ba,a 9f |
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44 | 3: |
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45 | subcc %g1, 3, %g0 ! syscall 3, enable interrupts |
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46 | bne 1f |
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47 | and %i0, SPARC_PSR_PIL_MASK, %l4 |
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48 | andn %l0, SPARC_PSR_PIL_MASK, %l5 |
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49 | or %l5, %l4, %l4 |
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50 | mov %l4, %psr |
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51 | ba,a 9f |
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52 | |
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53 | 1: |
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54 | ta 0 ! halt |
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55 | 9: ! leave |
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56 | mov 0, %g1 ! clear %g1 |
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57 | jmpl %l2, %g0 |
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58 | rett %l2 + 4 |
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59 | |
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60 | PUBLIC(sparc_disable_interrupts) |
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61 | |
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62 | SYM(sparc_disable_interrupts): |
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63 | |
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64 | mov SYS_irqdis, %g1 |
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65 | ta 0 |
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66 | retl |
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67 | nop |
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68 | |
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69 | PUBLIC(sparc_enable_interrupts) |
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70 | |
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71 | SYM(sparc_enable_interrupts): |
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72 | |
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73 | mov SYS_irqen, %g1 |
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74 | ta 0 |
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75 | retl |
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76 | nop |
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77 | |
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78 | /* end of file */ |
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