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908 | jermar | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | #include <libc.h> |
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30 | |||
917 | jermar | 31 | /** |
32 | * Immediate operand for break instruction. |
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33 | * Be carefull about the value as Ski simulator |
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34 | * is somewhat sensitive to its value. |
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35 | * |
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36 | * 0 will be confused with Ski breakpoint. |
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37 | * And higher values will be confused with SSC's. |
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38 | */ |
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39 | #define SYSCALL_IMM 1 |
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40 | |||
908 | jermar | 41 | sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3) |
42 | { |
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43 | sysarg_t ret; |
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44 | |||
45 | __asm__ volatile ( |
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46 | "mov r14 = %1\n" |
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47 | "mov r15 = %2\n" |
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48 | "mov r16 = %3\n" |
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49 | "mov r17 = %4\n" |
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917 | jermar | 50 | "break %5\n" |
908 | jermar | 51 | "mov %0 = r8\n" |
52 | : "=r" (ret) |
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917 | jermar | 53 | : "r" (id), "r" (p1), "r" (p2), "r" (p3), "i" (SYSCALL_IMM) |
908 | jermar | 54 | : "r8", "r14", "r15", "r16" |
55 | ); |
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56 | |||
57 | return ret; |
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58 | } |