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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [arm/] [syscalls.c] - Rev 262
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/* Support files for GNU libc. Files in the system namespace go here. Files in the C namespace (ie those that do not start with an underscore) go in .c. */ #include <_ansi.h> #include <sys/types.h> #include <sys/stat.h> #include <sys/fcntl.h> #include <stdio.h> #include <time.h> #include <sys/time.h> #include <sys/times.h> #include <errno.h> #include <reent.h> #include <signal.h> #include <unistd.h> #include <sys/wait.h> #include "swi.h" /* Forward prototypes. */ int _system _PARAMS ((const char *)); int _rename _PARAMS ((const char *, const char *)); int _isatty _PARAMS ((int)); clock_t _times _PARAMS ((struct tms *)); int _gettimeofday _PARAMS ((struct timeval *, void *)); void _raise _PARAMS ((void)); int _unlink _PARAMS ((const char *)); int _link _PARAMS ((void)); int _stat _PARAMS ((const char *, struct stat *)); int _fstat _PARAMS ((int, struct stat *)); caddr_t _sbrk _PARAMS ((int)); int _getpid _PARAMS ((int)); int _kill _PARAMS ((int, int)); void _exit _PARAMS ((int)); int _close _PARAMS ((int)); int _swiclose _PARAMS ((int)); int _open _PARAMS ((const char *, int, ...)); int _swiopen _PARAMS ((const char *, int)); int _write _PARAMS ((int, char *, int)); int _swiwrite _PARAMS ((int, char *, int)); int _lseek _PARAMS ((int, int, int)); int _swilseek _PARAMS ((int, int, int)); int _read _PARAMS ((int, char *, int)); int _swiread _PARAMS ((int, char *, int)); void initialise_monitor_handles _PARAMS ((void)); static int wrap _PARAMS ((int)); static int error _PARAMS ((int)); static int get_errno _PARAMS ((void)); static int remap_handle _PARAMS ((int)); static int do_AngelSWI _PARAMS ((int, void *)); static int findslot _PARAMS ((int)); /* Register name faking - works in collusion with the linker. */ register char * stack_ptr asm ("sp"); /* following is copied from libc/stdio/local.h to check std streams */ extern void _EXFUN(__sinit,(struct _reent *)); #define CHECK_INIT(ptr) \ do \ { \ if ((ptr) && !(ptr)->__sdidinit) \ __sinit (ptr); \ } \ while (0) /* Adjust our internal handles to stay away from std* handles. */ #define FILE_HANDLE_OFFSET (0x20) static int monitor_stdin; static int monitor_stdout; static int monitor_stderr; /* Struct used to keep track of the file position, just so we can implement fseek(fh,x,SEEK_CUR). */ typedef struct { int handle; int pos; } poslog; #define MAX_OPEN_FILES 20 static poslog openfiles [MAX_OPEN_FILES]; static int findslot (int fh) { int i; for (i = 0; i < MAX_OPEN_FILES; i ++) if (openfiles[i].handle == fh) break; return i; } #ifdef ARM_RDI_MONITOR static inline int do_AngelSWI (int reason, void * arg) { int value; asm volatile ("mov r0, %1; mov r1, %2; " AngelSWIInsn " %a3; mov %0, r0" : "=r" (value) /* Outputs */ : "r" (reason), "r" (arg), "i" (AngelSWI) /* Inputs */ : "r0", "r1", "r2", "r3", "ip", "lr", "memory", "cc" /* Clobbers r0 and r1, and lr if in supervisor mode */); /* Accordingly to page 13-77 of ARM DUI 0040D other registers can also be clobbered. Some memory positions may also be changed by a system call, so they should not be kept in registers. Note: we are assuming the manual is right and Angel is respecting the APCS. */ return value; } #endif /* ARM_RDI_MONITOR */ /* Function to convert std(in|out|err) handles to internal versions. */ static int remap_handle (int fh) { CHECK_INIT(_REENT); if (fh == STDIN_FILENO) return monitor_stdin; if (fh == STDOUT_FILENO) return monitor_stdout; if (fh == STDERR_FILENO) return monitor_stderr; return fh - FILE_HANDLE_OFFSET; } void initialise_monitor_handles (void) { int i; #ifdef ARM_RDI_MONITOR int volatile block[3]; block[0] = (int) ":tt"; block[2] = 3; /* length of filename */ block[1] = 0; /* mode "r" */ monitor_stdin = do_AngelSWI (AngelSWI_Reason_Open, (void *) block); block[0] = (int) ":tt"; block[2] = 3; /* length of filename */ block[1] = 4; /* mode "w" */ monitor_stdout = monitor_stderr = do_AngelSWI (AngelSWI_Reason_Open, (void *) block); #else int fh; const char * name; name = ":tt"; asm ("mov r0,%2; mov r1, #0; swi %a1; mov %0, r0" : "=r"(fh) : "i" (SWI_Open),"r"(name) : "r0","r1"); monitor_stdin = fh; name = ":tt"; asm ("mov r0,%2; mov r1, #4; swi %a1; mov %0, r0" : "=r"(fh) : "i" (SWI_Open),"r"(name) : "r0","r1"); monitor_stdout = monitor_stderr = fh; #endif for (i = 0; i < MAX_OPEN_FILES; i ++) openfiles[i].handle = -1; openfiles[0].handle = monitor_stdin; openfiles[0].pos = 0; openfiles[1].handle = monitor_stdout; openfiles[1].pos = 0; } static int get_errno (void) { #ifdef ARM_RDI_MONITOR return do_AngelSWI (AngelSWI_Reason_Errno, NULL); #else asm ("swi %a0" :: "i" (SWI_GetErrno)); #endif } static int error (int result) { errno = get_errno (); return result; } static int wrap (int result) { if (result == -1) return error (-1); return result; } /* Returns # chars not! written. */ int _swiread (int file, char * ptr, int len) { int fh = remap_handle (file); #ifdef ARM_RDI_MONITOR int block[3]; block[0] = fh; block[1] = (int) ptr; block[2] = len; return do_AngelSWI (AngelSWI_Reason_Read, block); #else asm ("mov r0, %1; mov r1, %2;mov r2, %3; swi %a0" : /* No outputs */ : "i"(SWI_Read), "r"(fh), "r"(ptr), "r"(len) : "r0","r1","r2"); #endif } int _read (int file, char * ptr, int len) { int slot = findslot (remap_handle (file)); int x = _swiread (file, ptr, len); if (x < 0) return error (-1); if (slot != MAX_OPEN_FILES) openfiles [slot].pos += len - x; /* x == len is not an error, at least if we want feof() to work. */ return len - x; } int _swilseek (int file, int ptr, int dir) { int res; int fh = remap_handle (file); int slot = findslot (fh); #ifdef ARM_RDI_MONITOR int block[2]; #endif if (dir == SEEK_CUR) { if (slot == MAX_OPEN_FILES) return -1; ptr = openfiles[slot].pos + ptr; dir = SEEK_SET; } #ifdef ARM_RDI_MONITOR if (dir == SEEK_END) { block[0] = fh; ptr += do_AngelSWI (AngelSWI_Reason_FLen, block); } /* This code only does absolute seeks. */ block[0] = remap_handle (file); block[1] = ptr; res = do_AngelSWI (AngelSWI_Reason_Seek, block); #else if (dir == SEEK_END) { asm ("mov r0, %2; swi %a1; mov %0, r0" : "=r" (res) : "i" (SWI_Flen), "r" (fh) : "r0"); ptr += res; } /* This code only does absolute seeks. */ asm ("mov r0, %2; mov r1, %3; swi %a1; mov %0, r0" : "=r" (res) : "i" (SWI_Seek), "r" (fh), "r" (ptr) : "r0", "r1"); #endif if (slot != MAX_OPEN_FILES && res == 0) openfiles[slot].pos = ptr; /* This is expected to return the position in the file. */ return res == 0 ? ptr : -1; } int _lseek (int file, int ptr, int dir) { return wrap (_swilseek (file, ptr, dir)); } /* Returns #chars not! written. */ int _swiwrite ( int file, char * ptr, int len) { int fh = remap_handle (file); #ifdef ARM_RDI_MONITOR int block[3]; block[0] = fh; block[1] = (int) ptr; block[2] = len; return do_AngelSWI (AngelSWI_Reason_Write, block); #else asm ("mov r0, %1; mov r1, %2;mov r2, %3; swi %a0" : /* No outputs */ : "i"(SWI_Write), "r"(fh), "r"(ptr), "r"(len) : "r0","r1","r2"); #endif } int _write (int file, char * ptr, int len) { int slot = findslot (remap_handle (file)); int x = _swiwrite (file, ptr,len); if (x == -1 || x == len) return error (-1); if (slot != MAX_OPEN_FILES) openfiles[slot].pos += len - x; return len - x; } extern int strlen (const char *); int _swiopen (const char * path, int flags) { int aflags = 0, fh; #ifdef ARM_RDI_MONITOR int block[3]; #endif int i = findslot (-1); if (i == MAX_OPEN_FILES) return -1; /* The flags are Unix-style, so we need to convert them. */ #ifdef O_BINARY if (flags & O_BINARY) aflags |= 1; #endif if (flags & O_RDWR) aflags |= 2; if (flags & O_CREAT) aflags |= 4; if (flags & O_TRUNC) aflags |= 4; if (flags & O_APPEND) { aflags &= ~4; /* Can't ask for w AND a; means just 'a'. */ aflags |= 8; } #ifdef ARM_RDI_MONITOR block[0] = (int) path; block[2] = strlen (path); block[1] = aflags; fh = do_AngelSWI (AngelSWI_Reason_Open, block); #else asm ("mov r0,%2; mov r1, %3; swi %a1; mov %0, r0" : "=r"(fh) : "i" (SWI_Open),"r"(path),"r"(aflags) : "r0","r1"); #endif if (fh >= 0) { openfiles[i].handle = fh; openfiles[i].pos = 0; } return fh >= 0 ? fh + FILE_HANDLE_OFFSET : error (fh); } int _open (const char * path, int flags, ...) { return wrap (_swiopen (path, flags)); } int _swiclose (int file) { int myhan = remap_handle (file); int slot = findslot (myhan); if (slot != MAX_OPEN_FILES) openfiles[slot].handle = -1; #ifdef ARM_RDI_MONITOR return do_AngelSWI (AngelSWI_Reason_Close, & myhan); #else asm ("mov r0, %1; swi %a0" :: "i" (SWI_Close),"r"(myhan):"r0"); #endif } int _close (int file) { return wrap (_swiclose (file)); } int _kill (int pid, int sig) { (void)pid; (void)sig; #ifdef ARM_RDI_MONITOR /* Note: The pid argument is thrown away. */ switch (sig) { case SIGABRT: return do_AngelSWI (AngelSWI_Reason_ReportException, (void *) ADP_Stopped_RunTimeError); default: return do_AngelSWI (AngelSWI_Reason_ReportException, (void *) ADP_Stopped_ApplicationExit); } #else asm ("swi %a0" :: "i" (SWI_Exit)); #endif } void _exit (int status) { /* There is only one SWI for both _exit and _kill. For _exit, call the SWI with the second argument set to -1, an invalid value for signum, so that the SWI handler can distinguish the two calls. Note: The RDI implementation of _kill throws away both its arguments. */ _kill(status, -1); } int _getpid (int n) { return 1; n = n; } caddr_t _sbrk (int incr) { extern char end asm ("end"); /* Defined by the linker. */ static char * heap_end; char * prev_heap_end; if (heap_end == NULL) heap_end = & end; prev_heap_end = heap_end; if (heap_end + incr > stack_ptr) { /* Some of the libstdc++-v3 tests rely upon detecting out of memory errors, so do not abort here. */ #if 0 extern void abort (void); _write (1, "_sbrk: Heap and stack collision\n", 32); abort (); #else errno = ENOMEM; return (caddr_t) -1; #endif } heap_end += incr; return (caddr_t) prev_heap_end; } extern void memset (struct stat *, int, unsigned int); int _fstat (int file, struct stat * st) { memset (st, 0, sizeof (* st)); st->st_mode = S_IFCHR; st->st_blksize = 1024; return 0; file = file; } int _stat (const char *fname, struct stat *st) { int file; /* The best we can do is try to open the file readonly. If it exists, then we can guess a few things about it. */ if ((file = _open (fname, O_RDONLY)) < 0) return -1; memset (st, 0, sizeof (* st)); st->st_mode = S_IFREG | S_IREAD; st->st_blksize = 1024; _swiclose (file); /* Not interested in the error. */ return 0; } int _link (void) { return -1; } int _unlink (const char *path) { #ifdef ARM_RDI_MONITOR int block[2]; block[0] = path; block[1] = strlen(path); return wrap (do_AngelSWI (AngelSWI_Reason_Remove, block)) ? -1 : 0; #else return -1; #endif } void _raise (void) { return; } int _gettimeofday (struct timeval * tp, void * tzvp) { struct timezone *tzp = tzvp; if (tp) { /* Ask the host for the seconds since the Unix epoch. */ #ifdef ARM_RDI_MONITOR tp->tv_sec = do_AngelSWI (AngelSWI_Reason_Time,NULL); #else { int value; asm ("swi %a1; mov %0, r0" : "=r" (value): "i" (SWI_Time) : "r0"); tp->tv_sec = value; } #endif tp->tv_usec = 0; } /* Return fixed data for the timezone. */ if (tzp) { tzp->tz_minuteswest = 0; tzp->tz_dsttime = 0; } return 0; } /* Return a clock that ticks at 100Hz. */ clock_t _times (struct tms * tp) { clock_t timeval; #ifdef ARM_RDI_MONITOR timeval = do_AngelSWI (AngelSWI_Reason_Clock,NULL); #else asm ("swi %a1; mov %0, r0" : "=r" (timeval): "i" (SWI_Clock) : "r0"); #endif if (tp) { tp->tms_utime = timeval; /* user time */ tp->tms_stime = 0; /* system time */ tp->tms_cutime = 0; /* user time, children */ tp->tms_cstime = 0; /* system time, children */ } return timeval; }; int _isatty (int fd) { #ifdef ARM_RDI_MONITOR int fh = remap_handle (fd); return wrap (do_AngelSWI (AngelSWI_Reason_IsTTY, &fh)); #else return (fd <= 2) ? 1 : 0; /* one of stdin, stdout, stderr */ #endif } int _system (const char *s) { #ifdef ARM_RDI_MONITOR int block[2]; int e; /* Hmmm. The ARM debug interface specification doesn't say whether SYS_SYSTEM does the right thing with a null argument, or assign any meaning to its return value. Try to do something reasonable.... */ if (!s) return 1; /* maybe there is a shell available? we can hope. :-P */ block[0] = s; block[1] = strlen (s); e = wrap (do_AngelSWI (AngelSWI_Reason_System, block)); if ((e >= 0) && (e < 256)) { /* We have to convert e, an exit status to the encoded status of the command. To avoid hard coding the exit status, we simply loop until we find the right position. */ int exit_code; for (exit_code = e; e && WEXITSTATUS (e) != exit_code; e <<= 1) continue; } return e; #else if (s == NULL) return 0; errno = ENOSYS; return -1; #endif } int _rename (const char * oldpath, const char * newpath) { #ifdef ARM_RDI_MONITOR int block[4]; block[0] = oldpath; block[1] = strlen(oldpath); block[2] = newpath; block[3] = strlen(newpath); return wrap (do_AngelSWI (AngelSWI_Reason_Rename, block)) ? -1 : 0; #else errno = ENOSYS; return -1; #endif }
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