[444] | 1 | /* Adapteva epiphany-core implementation of stdio support functions () |
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| 2 | |
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| 3 | Copyright (c) 2011, 2012 Adapteva, Inc. |
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| 4 | All rights reserved. |
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| 5 | |
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| 6 | Redistribution and use in source and binary forms, with or without |
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| 7 | modification, are permitted provided that the following conditions are met: |
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| 8 | * Redistributions of source code must retain the above copyright notice, |
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| 9 | this list of conditions and the following disclaimer. |
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| 10 | * Redistributions in binary form must reproduce the above copyright |
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| 11 | notice, this list of conditions and the following disclaimer in the |
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| 12 | documentation and/or other materials provided with the distribution. |
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| 13 | * Neither the name of Adapteva nor the names of its contributors may be |
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| 14 | used to endorse or promote products derived from this software without |
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| 15 | specific prior written permission. |
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| 16 | |
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| 17 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
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| 18 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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| 19 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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| 20 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
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| 21 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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| 22 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
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| 23 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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| 24 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
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| 25 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
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| 26 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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| 27 | POSSIBILITY OF SUCH DAMAGE. */ |
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| 28 | |
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| 29 | #include <errno.h> |
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| 30 | |
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| 31 | /* simple include interface to EPIPHANY trap instruction. */ |
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| 32 | |
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| 33 | /* |
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| 34 | * The simulator uses a trap instruction to escape to the simulator to do file i/o |
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| 35 | */ |
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| 36 | |
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| 37 | /* trapcode r0 r1 r2 */ |
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| 38 | #define TRAP_write 0 /* channel addr len */ |
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| 39 | #define TRAP_read 1 /* channel addr len */ |
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| 40 | #define TRAP_open 2 /* filepath mode */ |
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| 41 | #define TRAP_exit 3 /* status */ |
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| 42 | #define TRAP_pass 4 /* - */ |
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| 43 | #define TRAP_fail 5 /* - */ |
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| 44 | #define TRAP_close 6 /* channel */ |
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| 45 | #define TRAP_other 7 /* subcode r1 r2 */ |
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| 46 | |
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| 47 | |
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| 48 | #include "epiphany-syscalls.h" |
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| 49 | |
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| 50 | |
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| 51 | /* prototypical inline asm */ |
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| 52 | int __attribute__ ((section ("libgloss_epiphany"))) asm_write (int CHAN, void* ADDR, int LEN) |
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| 53 | { |
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| 54 | register int chan asm("r0") = CHAN; |
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| 55 | register void* addr asm("r1") = ADDR; |
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| 56 | register int len asm("r2") = LEN; |
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| 57 | register int result asm("r0"); |
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| 58 | register int error asm("r3"); |
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| 59 | asm ("trap 0" : "=r" (result), "=r" (error) : |
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| 60 | "r" (chan), "r" (addr), "r" (len)); |
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| 61 | if (error) |
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| 62 | errno = error; |
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| 63 | return result; |
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| 64 | } |
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| 65 | |
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| 66 | int __attribute__ ((section ("libgloss_epiphany"))) asm_read(int CHAN, void *ADDR, int LEN) |
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| 67 | { |
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| 68 | register int chan asm("r0") = CHAN; |
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| 69 | register void* addr asm("r1") = ADDR; |
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| 70 | register int len asm("r2") = LEN; |
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| 71 | register int result asm("r0"); |
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| 72 | register int error asm("r3"); |
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| 73 | asm ("trap 1" : "=r" (result), "=r" (error) : |
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| 74 | "r" (chan), "r" (addr), "r" (len)); |
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| 75 | if (error) |
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| 76 | errno = error; |
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| 77 | return result; |
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| 78 | } |
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| 79 | |
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| 80 | |
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| 81 | int __attribute__ ((section ("libgloss_epiphany"))) |
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| 82 | asm_open(const char* FILE, int FLAGS, int MODE) |
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| 83 | { |
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| 84 | register const char* file asm("r0") = FILE; |
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| 85 | register int flags asm("r1") = FLAGS; |
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| 86 | register int result asm("r0"); |
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| 87 | register int error asm("r3"); |
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| 88 | asm ("trap 2" : "=r" (result), "=r" (error) : "r" (file), "r" (flags)); |
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| 89 | if (error) |
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| 90 | errno = error; |
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| 91 | return result; |
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| 92 | } |
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| 93 | |
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| 94 | void __attribute__ ((section ("libgloss_epiphany"))) asm_exit(int STATUS) |
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| 95 | { |
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| 96 | register int status asm("r0") = STATUS; |
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| 97 | asm("trap 3" :: "r" (status)); |
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| 98 | } |
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| 99 | |
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| 100 | int __attribute__ ((section ("libgloss_epiphany"))) asm_close(int CHAN) |
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| 101 | { |
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| 102 | register int chan asm("r0") = CHAN; |
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| 103 | register int result asm("r0"); |
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| 104 | register int error asm("r3"); |
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| 105 | asm ("trap 6" : "=r" (result), "=r" (error) : "r" (chan)); |
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| 106 | if (error) |
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| 107 | errno = error; |
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| 108 | return result; |
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| 109 | } |
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| 110 | |
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| 111 | int __attribute__ ((section ("libgloss_epiphany"))) asm_syscall(void *P1,void *P2, void *P3, int SUBFUN) |
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| 112 | { |
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| 113 | register void* p1 asm("r0") = (void*)P1; |
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| 114 | register void* p2 asm("r1") = (void*)P2; |
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| 115 | register void* p3 asm("r2") = (void*)P3; |
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| 116 | register int result asm("r0"); |
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| 117 | register int subfun asm("r3") = SUBFUN; |
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| 118 | register int error asm("r3"); |
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| 119 | asm ("trap 7" : "=r" (result), "=r" (error) : |
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| 120 | "r" (p1), "r" (p2), "r" (p3), "r" (subfun)); |
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| 121 | if (error) |
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| 122 | errno = error; |
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| 123 | return result; |
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| 124 | } |
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| 125 | |
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| 126 | /* |
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| 127 | * Signal functions implementation |
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| 128 | * |
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| 129 | */ |
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| 130 | |
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| 131 | #include "epiphany-config.h" |
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| 132 | |
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| 133 | |
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| 134 | #define HW_RESET 0 |
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| 135 | #define SW_EXCEPTION_IVT_N 1 |
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| 136 | #define PAGE_MISS_IVT_N 2 |
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| 137 | #define TIMER0_IVT_N 3 |
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| 138 | #define TIMER1_IVT_N 4 |
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| 139 | #define MESSAGE_IVT_N 5 |
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| 140 | #define DMA0_IVT_N 6 |
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| 141 | #define DMA1_IVT_N 7 |
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| 142 | #define WAND_IVT_N 8 |
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| 143 | #define USR_SOFT_IVT_N 9 |
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| 144 | |
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| 145 | |
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| 146 | typedef void (*sighandler_t)(int); |
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| 147 | extern sighandler_t ISR_VECTOR[]; |
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| 148 | extern void DEFAULT_ISR_CALLBACK(); |
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| 149 | |
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| 150 | sighandler_t __attribute__ ((section ("libgloss_epiphany"))) signal(int signum, sighandler_t handler) { |
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| 151 | switch( signum ) |
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| 152 | { |
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| 153 | case SIG_DFL /* see signal.h */: |
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| 154 | //the default is ignore |
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| 155 | break; |
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| 156 | case SIG_IGN /* see signal.h */ : |
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| 157 | DEFAULT_ISR_CALLBACK(); |
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| 158 | break; |
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| 159 | case SIG_ERR : |
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| 160 | asm("trap 5"); |
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| 161 | break; |
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| 162 | case SIG_RESET: |
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| 163 | ISR_VECTOR[HW_RESET] = handler; |
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| 164 | break; |
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| 165 | case SIG_SW_EXCEPTION: |
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| 166 | ISR_VECTOR[SW_EXCEPTION_IVT_N] = handler; |
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| 167 | break; |
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| 168 | case SIG_PAGE_MISS: |
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| 169 | ISR_VECTOR[PAGE_MISS_IVT_N] = handler; |
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| 170 | break; |
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| 171 | case SIG_TIMER0: |
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| 172 | ISR_VECTOR[TIMER0_IVT_N] = handler; |
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| 173 | break; |
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| 174 | case SIG_TIMER1: |
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| 175 | ISR_VECTOR[TIMER1_IVT_N] = handler; |
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| 176 | break; |
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| 177 | case SIG_MESSAGE: |
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| 178 | ISR_VECTOR[MESSAGE_IVT_N] = handler; |
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| 179 | break; |
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| 180 | case SIG_DMA0: |
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| 181 | ISR_VECTOR[DMA0_IVT_N] = handler; |
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| 182 | break; |
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| 183 | case SIG_DMA1: |
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| 184 | ISR_VECTOR[DMA1_IVT_N] = handler; |
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| 185 | break; |
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| 186 | case SIG_WAND: |
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| 187 | ISR_VECTOR[WAND_IVT_N] = handler; |
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| 188 | break; |
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| 189 | |
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| 190 | case SIG_USR1: |
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| 191 | ISR_VECTOR[USR_SOFT_IVT_N] = handler; |
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| 192 | break; |
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| 193 | default: |
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| 194 | //do nothing |
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| 195 | return 0; |
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| 196 | } |
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| 197 | |
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| 198 | return 0; |
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| 199 | } |
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| 200 | |
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| 201 | //int e_raise(int signum) __attribute__ ((optimize("O0"))); |
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| 202 | |
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| 203 | int __attribute__ ((section ("libgloss_epiphany"))) e_raise(int signum) { |
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| 204 | |
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| 205 | //register int imask asm("r4") = 0 ; |
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| 206 | volatile register int ilatst /*asm("r5") */= signum; |
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| 207 | |
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| 208 | switch( signum ) |
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| 209 | { |
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| 210 | case SIG_DFL /* see signal.h */: |
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| 211 | //the default is ignore |
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| 212 | return 0; |
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| 213 | case SIG_IGN /* see signal.h */ : |
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| 214 | //do nothing |
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| 215 | return 0; |
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| 216 | case SIG_ERR : |
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| 217 | |
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| 218 | return 0; |
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| 219 | case SIG_RESET: |
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| 220 | //imask = 1 << HW_RESET; |
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| 221 | ilatst = 1 << HW_RESET; |
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| 222 | break; |
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| 223 | |
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| 224 | case SIG_SW_EXCEPTION: |
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| 225 | //imask = 1 << SW_EXCEPTION_IVT_N; |
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| 226 | ilatst = 1 << SW_EXCEPTION_IVT_N; |
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| 227 | break; |
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| 228 | case SIG_PAGE_MISS: |
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| 229 | //imask = 1 << PAGE_MISS_IVT_N; |
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| 230 | ilatst = 1 << PAGE_MISS_IVT_N; |
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| 231 | break; |
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| 232 | case SIG_TIMER0: |
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| 233 | //imask = 1 << TIMER0_IVT_N; |
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| 234 | ilatst = 1 << TIMER0_IVT_N; |
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| 235 | break; |
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| 236 | case SIG_TIMER1: |
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| 237 | //imask = 1 << TIMER1_IVT_N; |
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| 238 | ilatst = 1 << TIMER1_IVT_N; |
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| 239 | break; |
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| 240 | case SIG_MESSAGE: |
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| 241 | //imask = 1 << MESSAGE_IVT_N; |
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| 242 | ilatst = 1 << MESSAGE_IVT_N; |
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| 243 | break; |
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| 244 | case SIG_DMA0: |
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| 245 | //imask = 1 << DMA0_IVT_N; |
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| 246 | ilatst = 1 << DMA0_IVT_N; |
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| 247 | break; |
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| 248 | case SIG_DMA1: |
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| 249 | //imask = 1 << DMA1_IVT_N; |
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| 250 | ilatst = 1 << DMA1_IVT_N; |
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| 251 | break; |
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| 252 | case SIG_WAND: |
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| 253 | __asm__ __volatile__ ("wand"); |
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| 254 | //ilatst = 1 << WAND_IVT_N; |
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| 255 | //break; |
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| 256 | return; |
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| 257 | |
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| 258 | case SIG_USR1: |
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| 259 | ilatst = 1 << USR_SOFT_IVT_N; |
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| 260 | break; |
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| 261 | |
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| 262 | default: |
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| 263 | //do nothing |
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| 264 | return 0; |
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| 265 | } |
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| 266 | //asm("movts imask, r4;"); |
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| 267 | //asm("movts ilatst, r5;"); |
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| 268 | __asm__ __volatile__ ("movts ilatst, %0" : "=r" (ilatst) : "r" (ilatst)); |
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| 269 | return 0; |
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| 270 | |
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| 271 | } |
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