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1 | /* |
1 | /* |
2 | * Copyright (c) 2005 Martin Decky |
2 | * Copyright (c) 2007 Pavel Jancik |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
Line 28... | Line 28... | ||
28 | 28 | ||
29 | /** @addtogroup libcarm32 |
29 | /** @addtogroup libcarm32 |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | /** @file |
32 | /** @file |
33 | * @ingroup libcarm32 |
33 | * @brief Syscall routine. |
34 | */ |
34 | */ |
35 | 35 | ||
36 | #include <libc.h> |
36 | #include <libc.h> |
37 | 37 | ||
- | 38 | ||
- | 39 | /** Syscall routine. |
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- | 40 | * |
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- | 41 | * Stores p1-p4, id to r0-r4 registers and calls <code>swi</code> |
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- | 42 | * instruction. Returned value is read from r0 register. |
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- | 43 | * |
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- | 44 | * @param p1 Parameter 1. |
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- | 45 | * @param p2 Parameter 2. |
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- | 46 | * @param p3 Parameter 3. |
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- | 47 | * @param p4 Parameter 4. |
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- | 48 | * @param id Number of syscall. |
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- | 49 | * |
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- | 50 | * @return Syscall return value. |
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- | 51 | */ |
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38 | sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2, const sysarg_t p3, |
52 | sysarg_t __syscall(const sysarg_t p1, const sysarg_t p2, const sysarg_t p3, |
39 | const sysarg_t p4, const syscall_t id) |
53 | const sysarg_t p4, const syscall_t id) |
40 | { |
54 | { |
- | 55 | register sysarg_t __arm_reg_r0 asm("r0") = p1; |
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- | 56 | register sysarg_t __arm_reg_r1 asm("r1") = p2; |
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- | 57 | register sysarg_t __arm_reg_r2 asm("r2") = p3; |
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- | 58 | register sysarg_t __arm_reg_r3 asm("r3") = p4; |
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- | 59 | register sysarg_t __arm_reg_r4 asm("r4") = id; |
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- | 60 | ||
41 | /* TODO */ |
61 | asm volatile ( "swi" |
- | 62 | : "=r" (__arm_reg_r0) |
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- | 63 | : "r" (__arm_reg_r0), |
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- | 64 | "r" (__arm_reg_r1), |
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- | 65 | "r" (__arm_reg_r2), |
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- | 66 | "r" (__arm_reg_r3), |
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- | 67 | "r" (__arm_reg_r4) |
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- | 68 | ); |
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- | 69 | ||
42 | return 0; |
70 | return __arm_reg_r0; |
43 | } |
71 | } |
44 | 72 | ||
45 | /** @} |
73 | /** @} |
46 | */ |
74 | */ |