b07cfbff06
Alan Lehotsky <apl@alum.mit.edu> Joern Rennecke <joern.rennecke@embecosm.com> * configure.in: Add Epiphany support. * configure: Regenerate. * epiphany: New directory. * libgloss/README: Add Epiphany entry.
272 lines
7.3 KiB
C
272 lines
7.3 KiB
C
/* Adapteva epiphany-core implementation of stdio support functions ()
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Copyright (c) 2011, 2012 Adapteva, Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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* Neither the name of Adapteva nor the names of its contributors may be
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used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE. */
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#include <errno.h>
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/* simple include interface to EPIPHANY trap instruction. */
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/*
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* The simulator uses a trap instruction to escape to the simulator to do file i/o
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*/
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/* trapcode r0 r1 r2 */
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#define TRAP_write 0 /* channel addr len */
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#define TRAP_read 1 /* channel addr len */
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#define TRAP_open 2 /* filepath mode */
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#define TRAP_exit 3 /* status */
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#define TRAP_pass 4 /* - */
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#define TRAP_fail 5 /* - */
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#define TRAP_close 6 /* channel */
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#define TRAP_other 7 /* subcode r1 r2 */
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#include "epiphany-syscalls.h"
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/* prototypical inline asm */
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int __attribute__ ((section ("libgloss_epiphany"))) asm_write (int CHAN, void* ADDR, int LEN)
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{
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register int chan asm("r0") = CHAN;
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register void* addr asm("r1") = ADDR;
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register int len asm("r2") = LEN;
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register int result asm("r0");
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register int error asm("r3");
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asm ("trap 0" : "=r" (result), "=r" (error) :
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"r" (chan), "r" (addr), "r" (len));
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if (error)
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errno = error;
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return result;
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}
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int __attribute__ ((section ("libgloss_epiphany"))) asm_read(int CHAN, void *ADDR, int LEN)
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{
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register int chan asm("r0") = CHAN;
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register void* addr asm("r1") = ADDR;
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register int len asm("r2") = LEN;
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register int result asm("r0");
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register int error asm("r3");
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asm ("trap 1" : "=r" (result), "=r" (error) :
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"r" (chan), "r" (addr), "r" (len));
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if (error)
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errno = error;
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return result;
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}
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int __attribute__ ((section ("libgloss_epiphany")))
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asm_open(const char* FILE, int FLAGS, int MODE)
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{
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register const char* file asm("r0") = FILE;
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register int flags asm("r1") = FLAGS;
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register int result asm("r0");
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register int error asm("r3");
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asm ("trap 2" : "=r" (result), "=r" (error) : "r" (file), "r" (flags));
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if (error)
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errno = error;
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return result;
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}
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void __attribute__ ((section ("libgloss_epiphany"))) asm_exit(int STATUS)
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{
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register int status asm("r0") = STATUS;
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asm("trap 3" :: "r" (status));
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}
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int __attribute__ ((section ("libgloss_epiphany"))) asm_close(int CHAN)
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{
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register int chan asm("r0") = CHAN;
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register int result asm("r0");
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register int error asm("r3");
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asm ("trap 6" : "=r" (result), "=r" (error) : "r" (chan));
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if (error)
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errno = error;
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return result;
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}
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int __attribute__ ((section ("libgloss_epiphany"))) asm_syscall(void *P1,void *P2, void *P3, int SUBFUN)
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{
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register void* p1 asm("r0") = (void*)P1;
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register void* p2 asm("r1") = (void*)P2;
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register void* p3 asm("r2") = (void*)P3;
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register int result asm("r0");
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register int subfun asm("r3") = SUBFUN;
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register int error asm("r3");
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asm ("trap 7" : "=r" (result), "=r" (error) :
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"r" (p1), "r" (p2), "r" (p3), "r" (subfun));
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if (error)
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errno = error;
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return result;
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}
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/*
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* Signal functions implementation
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*
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*/
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#include "epiphany-config.h"
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#define HW_RESET 0
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#define SW_EXCEPTION_IVT_N 1
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#define PAGE_MISS_IVT_N 2
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#define TIMER0_IVT_N 3
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#define TIMER1_IVT_N 4
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#define MESSAGE_IVT_N 5
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#define DMA0_IVT_N 6
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#define DMA1_IVT_N 7
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#define WAND_IVT_N 8
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#define USR_SOFT_IVT_N 9
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typedef void (*sighandler_t)(int);
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extern sighandler_t ISR_VECTOR[];
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extern void DEFAULT_ISR_CALLBACK();
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sighandler_t __attribute__ ((section ("libgloss_epiphany"))) signal(int signum, sighandler_t handler) {
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switch( signum )
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{
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case SIG_DFL /* see signal.h */:
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//the default is ignore
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break;
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case SIG_IGN /* see signal.h */ :
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DEFAULT_ISR_CALLBACK();
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break;
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case SIG_ERR :
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asm("trap 5");
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break;
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case SIG_RESET:
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ISR_VECTOR[HW_RESET] = handler;
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break;
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case SIG_SW_EXCEPTION:
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ISR_VECTOR[SW_EXCEPTION_IVT_N] = handler;
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break;
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case SIG_PAGE_MISS:
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ISR_VECTOR[PAGE_MISS_IVT_N] = handler;
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break;
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case SIG_TIMER0:
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ISR_VECTOR[TIMER0_IVT_N] = handler;
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break;
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case SIG_TIMER1:
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ISR_VECTOR[TIMER1_IVT_N] = handler;
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break;
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case SIG_MESSAGE:
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ISR_VECTOR[MESSAGE_IVT_N] = handler;
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break;
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case SIG_DMA0:
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ISR_VECTOR[DMA0_IVT_N] = handler;
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break;
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case SIG_DMA1:
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ISR_VECTOR[DMA1_IVT_N] = handler;
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break;
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case SIG_WAND:
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ISR_VECTOR[WAND_IVT_N] = handler;
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break;
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case SIG_USR1:
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ISR_VECTOR[USR_SOFT_IVT_N] = handler;
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break;
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default:
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//do nothing
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return 0;
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}
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return 0;
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}
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//int e_raise(int signum) __attribute__ ((optimize("O0")));
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int __attribute__ ((section ("libgloss_epiphany"))) e_raise(int signum) {
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//register int imask asm("r4") = 0 ;
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volatile register int ilatst /*asm("r5") */= signum;
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switch( signum )
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{
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case SIG_DFL /* see signal.h */:
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//the default is ignore
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return 0;
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case SIG_IGN /* see signal.h */ :
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//do nothing
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return 0;
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case SIG_ERR :
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return 0;
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case SIG_RESET:
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//imask = 1 << HW_RESET;
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ilatst = 1 << HW_RESET;
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break;
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case SIG_SW_EXCEPTION:
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//imask = 1 << SW_EXCEPTION_IVT_N;
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ilatst = 1 << SW_EXCEPTION_IVT_N;
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break;
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case SIG_PAGE_MISS:
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//imask = 1 << PAGE_MISS_IVT_N;
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ilatst = 1 << PAGE_MISS_IVT_N;
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break;
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case SIG_TIMER0:
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//imask = 1 << TIMER0_IVT_N;
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ilatst = 1 << TIMER0_IVT_N;
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break;
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case SIG_TIMER1:
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//imask = 1 << TIMER1_IVT_N;
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ilatst = 1 << TIMER1_IVT_N;
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break;
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case SIG_MESSAGE:
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//imask = 1 << MESSAGE_IVT_N;
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ilatst = 1 << MESSAGE_IVT_N;
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break;
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case SIG_DMA0:
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//imask = 1 << DMA0_IVT_N;
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ilatst = 1 << DMA0_IVT_N;
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break;
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case SIG_DMA1:
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//imask = 1 << DMA1_IVT_N;
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ilatst = 1 << DMA1_IVT_N;
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break;
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case SIG_WAND:
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__asm__ __volatile__ ("wand");
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//ilatst = 1 << WAND_IVT_N;
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//break;
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return;
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case SIG_USR1:
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ilatst = 1 << USR_SOFT_IVT_N;
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break;
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default:
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//do nothing
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return 0;
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}
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//asm("movts imask, r4;");
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//asm("movts ilatst, r5;");
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__asm__ __volatile__ ("movts ilatst, %0" : "=r" (ilatst) : "r" (ilatst));
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return 0;
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}
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