| 1 | /*
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| 2 | * Copyright (c) 2007 Pavel Jancik
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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 | /** @addtogroup libcarm32
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | * @brief Syscall routine.
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| 34 | */
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| 35 |
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| 36 | #include <libc.h>
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| 37 |
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| 38 | /** Syscall routine.
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| 39 | *
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| 40 | * Stores p1-p4, id to r0-r4 registers and calls <code>swi</code>
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| 41 | * instruction. Returned value is read from r0 register.
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| 42 | *
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| 43 | * @param p1 Parameter 1.
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| 44 | * @param p2 Parameter 2.
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| 45 | * @param p3 Parameter 3.
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| 46 | * @param p4 Parameter 4.
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| 47 | * @param id Number of syscall.
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| 48 | *
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| 49 | * @return Syscall return value.
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| 50 | */
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| 51 | sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2, const sysarg_t p3,
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| 52 | const sysarg_t p4, const sysarg_t p5, const sysarg_t p6, const syscall_t id)
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| 53 | {
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| 54 | register sysarg_t __arm_reg_r0 asm("r0") = p1;
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| 55 | register sysarg_t __arm_reg_r1 asm("r1") = p2;
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| 56 | register sysarg_t __arm_reg_r2 asm("r2") = p3;
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| 57 | register sysarg_t __arm_reg_r3 asm("r3") = p4;
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| 58 | register sysarg_t __arm_reg_r4 asm("r4") = p5;
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| 59 | register sysarg_t __arm_reg_r5 asm("r5") = p6;
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| 60 | register sysarg_t __arm_reg_r6 asm("r6") = id;
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| 61 |
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| 62 | asm volatile (
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| 63 | "swi 0"
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| 64 | : "=r" (__arm_reg_r0)
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| 65 | : "r" (__arm_reg_r0),
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| 66 | "r" (__arm_reg_r1),
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| 67 | "r" (__arm_reg_r2),
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| 68 | "r" (__arm_reg_r3),
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| 69 | "r" (__arm_reg_r4),
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| 70 | "r" (__arm_reg_r5),
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| 71 | "r" (__arm_reg_r6)
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| 72 | :
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| 73 | /*
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| 74 | * Clobber memory too as some arguments might be
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| 75 | * actually pointers.
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| 76 | */
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| 77 | "memory"
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| 78 | );
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| 79 |
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| 80 | return __arm_reg_r0;
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| 81 | }
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| 82 |
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| 83 | /** @}
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| 84 | */
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