libgloss/arc/hl/hl_fstat.c

   1 /*
   2  * hl_fstat.c -- provide _fstat().
   3  *
   4  * Copyright (c) 2024 Synopsys Inc.
   5  *
   6  * The authors hereby grant permission to use, copy, modify, distribute,
   7  * and license this software and its documentation for any purpose, provided
   8  * that existing copyright notices are retained in all copies and that this
   9  * notice is included verbatim in any distributions.  No written agreement,
  10  * license, or royalty fee is required for any of the authorized uses.
  11  * Modifications to this software may be copyrighted by their authors
  12  * and need not follow the licensing terms described here, provided that
  13  * the new terms are clearly indicated on the first page of each file where
  14  * they apply.
  15  *
  16  */
  17
  18 #include <errno.h>
  19 #include <stdarg.h>
  20 #include <stdint.h>
  21 #include <sys/stat.h>
  22 #include <sys/types.h>
  23 #include <unistd.h>
  24
  25 #include "hl_toolchain.h"
  26 #include "hl_api.h"
  27
  28 /* Hostlink IO version of struct stat.  */
  29 struct _hl_stat {
  30   uint32_t  hl_dev;    /* ID of device containing file.  */
  31   uint16_t  hl_ino;    /* inode number.  */
  32   uint16_t  hl_mode;   /* File type and access mode.  */
  33   int16_t   hl_nlink;  /* Number of hard links.  */
  34   int16_t   hl_uid;    /* Owner's UID.  */
  35   int16_t   hl_gid;    /* Owner's GID.  */
  36   uint8_t   hl_pad[2]; /* Padding to match simulator struct.  */
  37   uint32_t  hl_rdev;   /* Device ID (if special file).  */
  38   int32_t   hl_size;   /* Size in bytes.  */
  39   int32_t   hl_atime;  /* Access time.  */
  40   int32_t   hl_mtime;  /* Modification time.  */
  41   int32_t   hl_ctime;  /* Creation time.  */
  42 } __packed;
  43
  44 /* Map Hostlink version of stat struct into newlib's one.  */
  45 static __always_inline void
  46 _hl_fstat_map (const struct _hl_stat *hl_stat, struct stat *stat)
  47 {
  48   stat->st_dev = hl_stat->hl_dev;
  49   stat->st_ino = hl_stat->hl_ino;
  50   stat->st_mode = hl_stat->hl_mode;
  51   stat->st_nlink = hl_stat->hl_nlink;
  52   stat->st_uid = hl_stat->hl_uid;
  53   stat->st_gid = hl_stat->hl_gid;
  54   stat->st_rdev = hl_stat->hl_rdev;
  55   stat->st_size = hl_stat->hl_size;
  56   stat->st_atime = hl_stat->hl_atime;
  57   stat->st_mtime = hl_stat->hl_mtime;
  58   stat->st_ctime = hl_stat->hl_ctime;
  59 }
  60
  61 /* Get host file info.  Implements HL_GNUIO_EXT_FSTAT.  */
  62 static __always_inline int
  63 _hl_fstat (int fd, struct stat *buf)
  64 {
  65   struct _hl_stat hl_stat;
  66   int32_t ret;
  67   uint32_t host_errno;
  68
  69   /* Special version of hostlink - retuned values are passed
  70    * through inargs.
  71    */
  72   host_errno = _user_hostlink (HL_GNUIO_EXT_VENDOR_ID, HL_GNUIO_EXT_FSTAT,
  73                                "iii",
  74                                (uint32_t) fd,
  75                                (uint32_t) &hl_stat,
  76                                (uint32_t) &ret);
  77
  78   if (ret < 0)
  79     {
  80       errno = host_errno;
  81       return ret;
  82     }
  83
  84   _hl_fstat_map (&hl_stat, buf);
  85
  86   _hl_delete ();
  87
  88   return ret;
  89 }
  90
  91 int
  92 _fstat (int fd, struct stat *buf)
  93 {
  94   return _hl_fstat (fd, buf);
  95 }