| [fbd6f81] | 1 | /*
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| 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 |
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| 29 | #include <libc.h>
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| 30 |
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| [4a8ed8a] | 31 | /**
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| 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 |
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| [fbd6f81] | 41 | sysarg_t __syscall(const syscall_t id, const sysarg_t p1, const sysarg_t p2, const sysarg_t p3)
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| 42 | {
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| 43 | sysarg_t ret;
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| 44 |
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| 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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| [4a8ed8a] | 50 | "break %5\n"
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| [fbd6f81] | 51 | "mov %0 = r8\n"
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| 52 | : "=r" (ret)
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| [4a8ed8a] | 53 | : "r" (id), "r" (p1), "r" (p2), "r" (p3), "i" (SYSCALL_IMM)
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| [fbd6f81] | 54 | : "r8", "r14", "r15", "r16"
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| 55 | );
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| 56 |
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| 57 | return ret;
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| 58 | }
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