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Diffstat (limited to 'libgloss/epiphany/epiphany-syscalls.c')
| -rw-r--r-- | libgloss/epiphany/epiphany-syscalls.c | 271 |
1 files changed, 271 insertions, 0 deletions
diff --git a/libgloss/epiphany/epiphany-syscalls.c b/libgloss/epiphany/epiphany-syscalls.c new file mode 100644 index 000000000..e6ebcee24 --- /dev/null +++ b/libgloss/epiphany/epiphany-syscalls.c @@ -0,0 +1,271 @@ +/* Adapteva epiphany-core implementation of stdio support functions () + + Copyright (c) 2011, 2012 Adapteva, Inc. + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions are met: + * Redistributions of source code must retain the above copyright notice, + this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + * Neither the name of Adapteva nor the names of its contributors may be + used to endorse or promote products derived from this software without + specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" + AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE + LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS + INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. */ + +#include <errno.h> + +/* simple include interface to EPIPHANY trap instruction. */ + +/* + * The simulator uses a trap instruction to escape to the simulator to do file i/o + */ + +/* trapcode r0 r1 r2 */ +#define TRAP_write 0 /* channel addr len */ +#define TRAP_read 1 /* channel addr len */ +#define TRAP_open 2 /* filepath mode */ +#define TRAP_exit 3 /* status */ +#define TRAP_pass 4 /* - */ +#define TRAP_fail 5 /* - */ +#define TRAP_close 6 /* channel */ +#define TRAP_other 7 /* subcode r1 r2 */ + + +#include "epiphany-syscalls.h" + + +/* prototypical inline asm */ +int __attribute__ ((section ("libgloss_epiphany"))) asm_write (int CHAN, void* ADDR, int LEN) +{ + register int chan asm("r0") = CHAN; + register void* addr asm("r1") = ADDR; + register int len asm("r2") = LEN; + register int result asm("r0"); + register int error asm("r3"); + asm ("trap 0" : "=r" (result), "=r" (error) : + "r" (chan), "r" (addr), "r" (len)); + if (error) + errno = error; + return result; +} + +int __attribute__ ((section ("libgloss_epiphany"))) asm_read(int CHAN, void *ADDR, int LEN) +{ + register int chan asm("r0") = CHAN; + register void* addr asm("r1") = ADDR; + register int len asm("r2") = LEN; + register int result asm("r0"); + register int error asm("r3"); + asm ("trap 1" : "=r" (result), "=r" (error) : + "r" (chan), "r" (addr), "r" (len)); + if (error) + errno = error; + return result; +} + + +int __attribute__ ((section ("libgloss_epiphany"))) +asm_open(const char* FILE, int FLAGS, int MODE) +{ + register const char* file asm("r0") = FILE; + register int flags asm("r1") = FLAGS; + register int result asm("r0"); + register int error asm("r3"); + asm ("trap 2" : "=r" (result), "=r" (error) : "r" (file), "r" (flags)); + if (error) + errno = error; + return result; +} + +void __attribute__ ((section ("libgloss_epiphany"))) asm_exit(int STATUS) +{ + register int status asm("r0") = STATUS; + asm("trap 3" :: "r" (status)); +} + +int __attribute__ ((section ("libgloss_epiphany"))) asm_close(int CHAN) +{ + register int chan asm("r0") = CHAN; + register int result asm("r0"); + register int error asm("r3"); + asm ("trap 6" : "=r" (result), "=r" (error) : "r" (chan)); + if (error) + errno = error; + return result; +} + +int __attribute__ ((section ("libgloss_epiphany"))) asm_syscall(void *P1,void *P2, void *P3, int SUBFUN) +{ + register void* p1 asm("r0") = (void*)P1; + register void* p2 asm("r1") = (void*)P2; + register void* p3 asm("r2") = (void*)P3; + register int result asm("r0"); + register int subfun asm("r3") = SUBFUN; + register int error asm("r3"); + asm ("trap 7" : "=r" (result), "=r" (error) : + "r" (p1), "r" (p2), "r" (p3), "r" (subfun)); + if (error) + errno = error; + return result; +} + +/* + * Signal functions implementation + * + */ + +#include "epiphany-config.h" + + +#define HW_RESET 0 +#define SW_EXCEPTION_IVT_N 1 +#define PAGE_MISS_IVT_N 2 +#define TIMER0_IVT_N 3 +#define TIMER1_IVT_N 4 +#define MESSAGE_IVT_N 5 +#define DMA0_IVT_N 6 +#define DMA1_IVT_N 7 +#define WAND_IVT_N 8 +#define USR_SOFT_IVT_N 9 + + +typedef void (*sighandler_t)(int); +extern sighandler_t ISR_VECTOR[]; +extern void DEFAULT_ISR_CALLBACK(); + +sighandler_t __attribute__ ((section ("libgloss_epiphany"))) signal(int signum, sighandler_t handler) { + switch( signum ) + { + case SIG_DFL /* see signal.h */: + //the default is ignore + break; + case SIG_IGN /* see signal.h */ : + DEFAULT_ISR_CALLBACK(); + break; + case SIG_ERR : + asm("trap 5"); + break; + case SIG_RESET: + ISR_VECTOR[HW_RESET] = handler; + break; + case SIG_SW_EXCEPTION: + ISR_VECTOR[SW_EXCEPTION_IVT_N] = handler; + break; + case SIG_PAGE_MISS: + ISR_VECTOR[PAGE_MISS_IVT_N] = handler; + break; + case SIG_TIMER0: + ISR_VECTOR[TIMER0_IVT_N] = handler; + break; + case SIG_TIMER1: + ISR_VECTOR[TIMER1_IVT_N] = handler; + break; + case SIG_MESSAGE: + ISR_VECTOR[MESSAGE_IVT_N] = handler; + break; + case SIG_DMA0: + ISR_VECTOR[DMA0_IVT_N] = handler; + break; + case SIG_DMA1: + ISR_VECTOR[DMA1_IVT_N] = handler; + break; + case SIG_WAND: + ISR_VECTOR[WAND_IVT_N] = handler; + break; + + case SIG_USR1: + ISR_VECTOR[USR_SOFT_IVT_N] = handler; + break; + default: + //do nothing + return 0; + } + + return 0; +} + +//int e_raise(int signum) __attribute__ ((optimize("O0"))); + +int __attribute__ ((section ("libgloss_epiphany"))) e_raise(int signum) { + + //register int imask asm("r4") = 0 ; + volatile register int ilatst /*asm("r5") */= signum; + + switch( signum ) + { + case SIG_DFL /* see signal.h */: + //the default is ignore + return 0; + case SIG_IGN /* see signal.h */ : + //do nothing + return 0; + case SIG_ERR : + + return 0; + case SIG_RESET: + //imask = 1 << HW_RESET; + ilatst = 1 << HW_RESET; + break; + + case SIG_SW_EXCEPTION: + //imask = 1 << SW_EXCEPTION_IVT_N; + ilatst = 1 << SW_EXCEPTION_IVT_N; + break; + case SIG_PAGE_MISS: + //imask = 1 << PAGE_MISS_IVT_N; + ilatst = 1 << PAGE_MISS_IVT_N; + break; + case SIG_TIMER0: + //imask = 1 << TIMER0_IVT_N; + ilatst = 1 << TIMER0_IVT_N; + break; + case SIG_TIMER1: + //imask = 1 << TIMER1_IVT_N; + ilatst = 1 << TIMER1_IVT_N; + break; + case SIG_MESSAGE: + //imask = 1 << MESSAGE_IVT_N; + ilatst = 1 << MESSAGE_IVT_N; + break; + case SIG_DMA0: + //imask = 1 << DMA0_IVT_N; + ilatst = 1 << DMA0_IVT_N; + break; + case SIG_DMA1: + //imask = 1 << DMA1_IVT_N; + ilatst = 1 << DMA1_IVT_N; + break; + case SIG_WAND: + __asm__ __volatile__ ("wand"); + //ilatst = 1 << WAND_IVT_N; + //break; + return; + + case SIG_USR1: + ilatst = 1 << USR_SOFT_IVT_N; + break; + + default: + //do nothing + return 0; + } + //asm("movts imask, r4;"); + //asm("movts ilatst, r5;"); + __asm__ __volatile__ ("movts ilatst, %0" : "=r" (ilatst) : "r" (ilatst)); + return 0; + +} |