847e89f8e1
2007-07-12 Daniel Jacobowitz <dan@codesourcery.com>
* arm/syscalls.c (_stat): Use _close
* arm/syscalls.c (struct poslog): Rename to...
(struct fdent): ... this.
(FILE_HANDLE_OFFSET): Remove.
(findslot): Return a struct fdent* if fd is valid, otherwise return NULL.
(newslot): New function.
(remap_handle): Remove.
(initialise_monitor_handles): Use stdout as fallback for stderr.
(wrap): Rename to...
(checkerror): ... this.
(_swiread): Use checkerror() for the return of SWI calls. Correct the use of r0.
(_read): Use findslot(). Return EBADF on bad handle.
(_swilseek): Call findslot(). Check for valid whence. Check for negative offset when using
SEEK_CUR, and check for overflow. Use checkerror(). Check *_Flen calls for errors.
(_swiwrite): Correct the use of r0.
(_write): Call findslot().
(_swiopen): Call findslot(). Check for valid flags. Use checkerror(). Call newslot().
Handle O_TRUNC, and O_WRONLY. Return index into openfiles[] for fd.
(_swiclose): Correct the use of r0.
(_close): Handle stderr == stdout case. Only reclaim handle if _swiclose succeeded.
(_getpid): Use __attribute__((unused)).
(_sbrk): Fix formatting.
(_swistat): New function.
(_stat): Call _swistat().
(_fstat): Call _swistat().
(_unlink): Correct the use of r0.
(isatty): Call finslot(). Correct the use of r0.
(_system): Call checkerror(). Correct the use of r0.
(_rename): Correct the use of r0.
850 lines
17 KiB
C
850 lines
17 KiB
C
/* Support files for GNU libc. Files in the system namespace go here.
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Files in the C namespace (ie those that do not start with an
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underscore) go in .c. */
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#include <_ansi.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <sys/time.h>
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#include <sys/times.h>
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#include <errno.h>
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#include <reent.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include "swi.h"
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/* Forward prototypes. */
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int _system _PARAMS ((const char *));
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int _rename _PARAMS ((const char *, const char *));
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int _isatty _PARAMS ((int));
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clock_t _times _PARAMS ((struct tms *));
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int _gettimeofday _PARAMS ((struct timeval *, void *));
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int _unlink _PARAMS ((const char *));
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int _link _PARAMS ((void));
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int _stat _PARAMS ((const char *, struct stat *));
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int _fstat _PARAMS ((int, struct stat *));
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int _swistat _PARAMS ((int fd, struct stat * st));
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caddr_t _sbrk _PARAMS ((int));
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int _getpid _PARAMS ((int));
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int _close _PARAMS ((int));
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clock_t _clock _PARAMS ((void));
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int _swiclose _PARAMS ((int));
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int _open _PARAMS ((const char *, int, ...));
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int _swiopen _PARAMS ((const char *, int));
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int _write _PARAMS ((int, char *, int));
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int _swiwrite _PARAMS ((int, char *, int));
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int _lseek _PARAMS ((int, int, int));
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int _swilseek _PARAMS ((int, int, int));
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int _read _PARAMS ((int, char *, int));
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int _swiread _PARAMS ((int, char *, int));
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void initialise_monitor_handles _PARAMS ((void));
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static int checkerror _PARAMS ((int));
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static int error _PARAMS ((int));
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static int get_errno _PARAMS ((void));
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/* Struct used to keep track of the file position, just so we
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can implement fseek(fh,x,SEEK_CUR). */
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struct fdent
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{
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int handle;
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int pos;
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};
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#define MAX_OPEN_FILES 20
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/* User file descriptors (fd) are integer indexes into
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the openfiles[] array. Error checking is done by using
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findslot().
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This openfiles array is manipulated directly by only
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these 5 functions:
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findslot() - Translate entry.
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newslot() - Find empty entry.
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initilise_monitor_handles() - Initialize entries.
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_swiopen() - Initialize entry.
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_close() - Handle stdout == stderr case.
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Every other function must use findslot(). */
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static struct fdent openfiles [MAX_OPEN_FILES];
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static struct fdent* findslot _PARAMS ((int));
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static int newslot _PARAMS ((void));
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/* Register name faking - works in collusion with the linker. */
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register char * stack_ptr asm ("sp");
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/* following is copied from libc/stdio/local.h to check std streams */
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extern void _EXFUN(__sinit,(struct _reent *));
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#define CHECK_INIT(ptr) \
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do \
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{ \
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if ((ptr) && !(ptr)->__sdidinit) \
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__sinit (ptr); \
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} \
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while (0)
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static int monitor_stdin;
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static int monitor_stdout;
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static int monitor_stderr;
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/* Return a pointer to the structure associated with
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the user file descriptor fd. */
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static struct fdent*
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findslot (int fd)
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{
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CHECK_INIT(_REENT);
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/* User file descriptor is out of range. */
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if ((unsigned int)fd >= MAX_OPEN_FILES)
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return NULL;
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/* User file descriptor is open? */
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if (openfiles[fd].handle == -1)
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return NULL;
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/* Valid. */
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return &openfiles[fd];
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}
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/* Return the next lowest numbered free file
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structure, or -1 if we can't find one. */
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static int
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newslot (void)
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{
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int i;
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for (i = 0; i < MAX_OPEN_FILES; i++)
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if (openfiles[i].handle == -1)
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break;
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if (i == MAX_OPEN_FILES)
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return -1;
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return i;
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}
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void
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initialise_monitor_handles (void)
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{
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int i;
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/* Open the standard file descriptors by opening the special
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* teletype device, ":tt", read-only to obtain a descritpor for
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* standard input and write-only to obtain a descriptor for standard
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* output. Finally, open ":tt" in append mode to obtain a descriptor
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* for standard error. Since this is a write mode, most kernels will
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* probably return the same value as for standard output, but the
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* kernel can differentiate the two using the mode flag and return a
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* different descriptor for standard error.
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*/
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#ifdef ARM_RDI_MONITOR
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int volatile block[3];
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block[0] = (int) ":tt";
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block[2] = 3; /* length of filename */
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block[1] = 0; /* mode "r" */
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monitor_stdin = do_AngelSWI (AngelSWI_Reason_Open, (void *) block);
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block[0] = (int) ":tt";
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block[2] = 3; /* length of filename */
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block[1] = 4; /* mode "w" */
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monitor_stdout = do_AngelSWI (AngelSWI_Reason_Open, (void *) block);
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block[0] = (int) ":tt";
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block[2] = 3; /* length of filename */
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block[1] = 8; /* mode "a" */
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monitor_stderr = do_AngelSWI (AngelSWI_Reason_Open, (void *) block);
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#else
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int fh;
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const char * name;
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name = ":tt";
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asm ("mov r0,%2; mov r1, #0; swi %a1; mov %0, r0"
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: "=r"(fh)
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: "i" (SWI_Open),"r"(name)
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: "r0","r1");
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monitor_stdin = fh;
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name = ":tt";
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asm ("mov r0,%2; mov r1, #4; swi %a1; mov %0, r0"
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: "=r"(fh)
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: "i" (SWI_Open),"r"(name)
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: "r0","r1");
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monitor_stdout = fh;
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name = ":tt";
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asm ("mov r0,%2; mov r1, #8; swi %a1; mov %0, r0"
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: "=r"(fh)
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: "i" (SWI_Open),"r"(name)
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: "r0","r1");
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monitor_stderr = fh;
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#endif
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/* If we failed to open stderr, redirect to stdout. */
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if (monitor_stderr == -1)
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monitor_stderr = monitor_stdout;
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for (i = 0; i < MAX_OPEN_FILES; i ++)
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openfiles[i].handle = -1;
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openfiles[0].handle = monitor_stdin;
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openfiles[0].pos = 0;
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openfiles[1].handle = monitor_stdout;
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openfiles[1].pos = 0;
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openfiles[2].handle = monitor_stderr;
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openfiles[2].pos = 0;
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}
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static int
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get_errno (void)
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{
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#ifdef ARM_RDI_MONITOR
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return do_AngelSWI (AngelSWI_Reason_Errno, NULL);
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#else
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register r0 asm("r0");
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asm ("swi %a1" : "=r"(r0) : "i" (SWI_GetErrno));
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return r0;
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#endif
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}
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/* Set errno and return result. */
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static int
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error (int result)
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{
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errno = get_errno ();
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return result;
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}
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/* Check the return and set errno appropriately. */
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static int
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checkerror (int result)
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{
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if (result == -1)
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return error (-1);
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return result;
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}
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/* fh, is a valid internal file handle.
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ptr, is a null terminated string.
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len, is the length in bytes to read.
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Returns the number of bytes *not* written. */
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int
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_swiread (int fh,
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char * ptr,
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int len)
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{
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#ifdef ARM_RDI_MONITOR
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int block[3];
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block[0] = fh;
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block[1] = (int) ptr;
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block[2] = len;
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return checkerror (do_AngelSWI (AngelSWI_Reason_Read, block));
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#else
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register r0 asm("r0");
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register r1 asm("r1");
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register r2 asm("r2");
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r0 = fh;
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r1 = (int)ptr;
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r2 = len;
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asm ("swi %a4"
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: "=r" (r0)
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: "0"(r0), "r"(r1), "r"(r2), "i"(SWI_Read));
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return checkerror (r0);
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#endif
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}
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/* fd, is a valid user file handle.
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Translates the return of _swiread into
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bytes read. */
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int
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_read (int fd,
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char * ptr,
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int len)
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{
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int res;
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struct fdent *pfd;
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pfd = findslot (fd);
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if (pfd == NULL)
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{
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errno = EBADF;
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return -1;
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}
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res = _swiread (pfd->handle, ptr, len);
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if (res == -1)
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return res;
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pfd->pos += len - res;
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/* res == len is not an error,
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at least if we want feof() to work. */
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return len - res;
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}
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/* fd, is a user file descriptor. */
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int
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_swilseek (int fd,
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int ptr,
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int dir)
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{
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int res;
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struct fdent *pfd;
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/* Valid file descriptor? */
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pfd = findslot (fd);
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if (pfd == NULL)
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{
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errno = EBADF;
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return -1;
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}
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/* Valid whence? */
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if ((dir != SEEK_CUR)
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&& (dir != SEEK_SET)
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&& (dir != SEEK_END))
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{
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errno = EINVAL;
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return -1;
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}
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/* Convert SEEK_CUR to SEEK_SET */
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if (dir == SEEK_CUR)
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{
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ptr = pfd->pos + ptr;
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/* The resulting file offset would be negative. */
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if (ptr < 0)
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{
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errno = EINVAL;
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if ((pfd->pos > 0) && (ptr > 0))
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errno = EOVERFLOW;
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return -1;
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}
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dir = SEEK_SET;
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}
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#ifdef ARM_RDI_MONITOR
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int block[2];
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if (dir == SEEK_END)
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{
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block[0] = pfd->handle;
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res = checkerror (do_AngelSWI (AngelSWI_Reason_FLen, block));
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if (res == -1)
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return -1;
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ptr += res;
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}
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/* This code only does absolute seeks. */
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block[0] = pfd->handle;
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block[1] = ptr;
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res = checkerror (do_AngelSWI (AngelSWI_Reason_Seek, block));
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#else
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if (dir == SEEK_END)
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{
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asm ("mov r0, %2; swi %a1; mov %0, r0"
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: "=r" (res)
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: "i" (SWI_Flen), "r" (pfd->handle)
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: "r0");
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checkerror (res);
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if (res == -1)
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return -1;
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ptr += res;
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}
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/* This code only does absolute seeks. */
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asm ("mov r0, %2; mov r1, %3; swi %a1; mov %0, r0"
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: "=r" (res)
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: "i" (SWI_Seek), "r" (pfd->handle), "r" (ptr)
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: "r0", "r1");
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checkerror (res);
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#endif
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/* At this point ptr is the current file position. */
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if (res >= 0)
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{
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pfd->pos = ptr;
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return ptr;
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}
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else
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return -1;
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}
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_lseek (int fd,
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int ptr,
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int dir)
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{
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return _swilseek (fd, ptr, dir);
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}
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/* fh, is a valid internal file handle.
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Returns the number of bytes *not* written. */
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int
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_swiwrite (
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int fh,
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char * ptr,
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int len)
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{
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#ifdef ARM_RDI_MONITOR
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int block[3];
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block[0] = fh;
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block[1] = (int) ptr;
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block[2] = len;
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return checkerror (do_AngelSWI (AngelSWI_Reason_Write, block));
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#else
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register r0 asm("r0");
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register r1 asm("r1");
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register r2 asm("r2");
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r0 = fh;
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r1 = (int)ptr;
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r2 = len;
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asm ("swi %a4"
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: "=r" (r0)
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: "0"(r0), "r"(r1), "r"(r2), "i"(SWI_Write));
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return checkerror (r0);
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#endif
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}
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/* fd, is a user file descriptor. */
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int
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_write (int fd,
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char * ptr,
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int len)
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{
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int res;
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struct fdent *pfd;
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pfd = findslot (fd);
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if (pfd == NULL)
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{
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errno = EBADF;
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return -1;
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}
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res = _swiwrite (pfd->handle, ptr,len);
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/* Clearly an error. */
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if (res < 0)
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return -1;
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pfd->pos += len - res;
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/* We wrote 0 bytes?
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Retrieve errno just in case. */
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if ((len - res) == 0)
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return error (0);
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return (len - res);
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}
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int
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_swiopen (const char * path, int flags)
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{
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int aflags = 0, fh;
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#ifdef ARM_RDI_MONITOR
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int block[3];
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#endif
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int fd = newslot ();
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if (fd == -1)
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{
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errno = EMFILE;
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return -1;
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}
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/* It is an error to open a file that already exists. */
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if ((flags & O_CREAT)
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&& (flags & O_EXCL))
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{
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struct stat st;
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int res;
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res = _stat (path, &st);
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if (res != -1)
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{
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errno = EEXIST;
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return -1;
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}
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}
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/* The flags are Unix-style, so we need to convert them. */
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#ifdef O_BINARY
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if (flags & O_BINARY)
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aflags |= 1;
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#endif
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/* In O_RDONLY we expect aflags == 0. */
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if (flags & O_RDWR)
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aflags |= 2;
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if ((flags & O_CREAT)
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|| (flags & O_TRUNC)
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|| (flags & O_WRONLY))
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aflags |= 4;
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if (flags & O_APPEND)
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{
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/* Can't ask for w AND a; means just 'a'. */
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aflags &= ~4;
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aflags |= 8;
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}
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#ifdef ARM_RDI_MONITOR
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block[0] = (int) path;
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block[2] = strlen (path);
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block[1] = aflags;
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fh = do_AngelSWI (AngelSWI_Reason_Open, block);
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#else
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asm ("mov r0,%2; mov r1, %3; swi %a1; mov %0, r0"
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: "=r"(fh)
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: "i" (SWI_Open),"r"(path),"r"(aflags)
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: "r0","r1");
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#endif
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/* Return a user file descriptor or an error. */
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if (fh >= 0)
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{
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openfiles[fd].handle = fh;
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openfiles[fd].pos = 0;
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return fd;
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}
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else
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return error (fh);
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}
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int
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_open (const char * path, int flags, ...)
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{
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return _swiopen (path, flags);
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}
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/* fh, is a valid internal file handle. */
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int
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_swiclose (int fh)
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{
|
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#ifdef ARM_RDI_MONITOR
|
|
return checkerror (do_AngelSWI (AngelSWI_Reason_Close, &fh));
|
|
#else
|
|
register r0 asm("r0");
|
|
r0 = fh;
|
|
asm ("swi %a2"
|
|
: "=r"(r0)
|
|
: "0"(r0), "i" (SWI_Close));
|
|
return checkerror (r0);
|
|
#endif
|
|
}
|
|
|
|
/* fd, is a user file descriptor. */
|
|
int
|
|
_close (int fd)
|
|
{
|
|
int res;
|
|
struct fdent *pfd;
|
|
|
|
pfd = findslot (fd);
|
|
if (pfd == NULL)
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
/* Handle stderr == stdout. */
|
|
if ((fd == 1 || fd == 2)
|
|
&& (openfiles[1].handle == openfiles[2].handle))
|
|
{
|
|
pfd->handle = -1;
|
|
return 0;
|
|
}
|
|
|
|
/* Attempt to close the handle. */
|
|
res = _swiclose (pfd->handle);
|
|
|
|
/* Reclaim handle? */
|
|
if (res == 0)
|
|
pfd->handle = -1;
|
|
|
|
return res;
|
|
}
|
|
|
|
int __attribute__((weak))
|
|
_getpid (int n __attribute__ ((unused)))
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
int
|
|
_swistat (int fd, struct stat * st)
|
|
{
|
|
struct fdent *pfd;
|
|
int res;
|
|
|
|
pfd = findslot (fd);
|
|
if (pfd == NULL)
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
/* Always assume a character device,
|
|
with 1024 byte blocks. */
|
|
st->st_mode |= S_IFCHR;
|
|
st->st_blksize = 1024;
|
|
#ifdef ARM_RDI_MONITOR
|
|
res = checkerror (do_AngelSWI (AngelSWI_Reason_FLen, &pfd->handle));
|
|
#else
|
|
asm ("mov r0, %2; swi %a1; mov %0, r0"
|
|
: "=r" (res)
|
|
: "i" (SWI_Flen), "r" (pfd->handle)
|
|
: "r0");
|
|
checkerror (res);
|
|
#endif
|
|
if (res == -1)
|
|
return -1;
|
|
/* Return the file size. */
|
|
st->st_size = res;
|
|
return 0;
|
|
}
|
|
|
|
int __attribute__((weak))
|
|
_fstat (int fd, struct stat * st)
|
|
{
|
|
memset (st, 0, sizeof (* st));
|
|
return _swistat (fd, st);
|
|
}
|
|
|
|
int __attribute__((weak))
|
|
_stat (const char *fname, struct stat *st)
|
|
{
|
|
int fd, res;
|
|
memset (st, 0, sizeof (* st));
|
|
/* 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 ((fd = _open (fname, O_RDONLY)) == -1)
|
|
return -1;
|
|
st->st_mode |= S_IFREG | S_IREAD;
|
|
res = _swistat (fd, st);
|
|
/* Not interested in the error. */
|
|
_close (fd);
|
|
return res;
|
|
}
|
|
|
|
int __attribute__((weak))
|
|
_link (void)
|
|
{
|
|
errno = ENOSYS;
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
_unlink (const char *path)
|
|
{
|
|
int res;
|
|
#ifdef ARM_RDI_MONITOR
|
|
int block[2];
|
|
block[0] = (int)path;
|
|
block[1] = strlen(path);
|
|
res = do_AngelSWI (AngelSWI_Reason_Remove, block);
|
|
#else
|
|
register r0 asm("r0");
|
|
r0 = (int)path;
|
|
asm ("swi %a2"
|
|
: "=r"(r0)
|
|
: "0"(r0), "i" (SWI_Remove));
|
|
res = r0;
|
|
#endif
|
|
if (res == -1)
|
|
return error (res);
|
|
return 0;
|
|
}
|
|
|
|
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
|
|
_clock (void)
|
|
{
|
|
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
|
|
return timeval;
|
|
}
|
|
|
|
/* Return a clock that ticks at 100Hz. */
|
|
clock_t
|
|
_times (struct tms * tp)
|
|
{
|
|
clock_t timeval = _clock();
|
|
|
|
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)
|
|
{
|
|
struct fdent *pfd;
|
|
|
|
pfd = findslot (fd);
|
|
if (pfd == NULL)
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
#ifdef ARM_RDI_MONITOR
|
|
return checkerror (do_AngelSWI (AngelSWI_Reason_IsTTY, &pfd->handle));
|
|
#else
|
|
register r0 asm("r0");
|
|
r0 = pfd->handle;
|
|
asm ("swi %a2"
|
|
: "=r" (r0)
|
|
: "0"(r0), "i" (SWI_IsTTY));
|
|
return checkerror (r0);
|
|
#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] = (int)s;
|
|
block[1] = strlen (s);
|
|
e = checkerror (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
|
|
register r0 asm("r0");
|
|
r0 = (int)s;
|
|
asm ("swi %a2"
|
|
: "=r" (r0)
|
|
: "0"(r0), "i" (SWI_CLI));
|
|
return checkerror (r0);
|
|
#endif
|
|
}
|
|
|
|
int
|
|
_rename (const char * oldpath, const char * newpath)
|
|
{
|
|
#ifdef ARM_RDI_MONITOR
|
|
int block[4];
|
|
block[0] = (int)oldpath;
|
|
block[1] = strlen(oldpath);
|
|
block[2] = (int)newpath;
|
|
block[3] = strlen(newpath);
|
|
return checkerror (do_AngelSWI (AngelSWI_Reason_Rename, block)) ? -1 : 0;
|
|
#else
|
|
register r0 asm("r0");
|
|
register r1 asm("r1");
|
|
r0 = (int)oldpath;
|
|
r1 = (int)newpath;
|
|
asm ("swi %a3"
|
|
: "=r" (r0)
|
|
: "0" (r0), "r" (r1), "i" (SWI_Rename));
|
|
return checkerror (r0);
|
|
#endif
|
|
}
|