From c0cd8a68dc3d922733b5c455ecc3bfc23a76f042 Mon Sep 17 00:00:00 2001
From: huaixv <44743118+huaixv@users.noreply.github.com>
Date: Thu, 25 Mar 2021 21:40:59 +0800
Subject: Add `statx` syscall

---
 fesvr/fesvr.ac   |  5 +++
 fesvr/syscall.cc | 94 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fesvr/syscall.h  |  1 +
 3 files changed, 100 insertions(+)

(limited to 'fesvr')

diff --git a/fesvr/fesvr.ac b/fesvr/fesvr.ac
index 60e6c57..9a211b1 100644
--- a/fesvr/fesvr.ac
+++ b/fesvr/fesvr.ac
@@ -1 +1,6 @@
 AC_CHECK_LIB(pthread, pthread_create, [], [AC_MSG_ERROR([libpthread is required])])
+
+AC_CHECK_MEMBER(struct statx.stx_mnt_id,
+  AC_DEFINE_UNQUOTED(HAVE_STATX_MNT_ID, 1, [Define to 1 if struct statx has stx_mnt_id.]),
+  ,
+)
diff --git a/fesvr/syscall.cc b/fesvr/syscall.cc
index fb2c3f8..8a9b29b 100644
--- a/fesvr/syscall.cc
+++ b/fesvr/syscall.cc
@@ -57,6 +57,84 @@ struct riscv_stat
       __unused4(), __unused5() {}
 };
 
+
+struct riscv_statx_timestamp {
+    target_endian<int64_t>  tv_sec;
+    target_endian<uint32_t> tv_nsec;
+    target_endian<int32_t>  __reserved;
+};
+
+struct riscv_statx
+{
+    target_endian<uint32_t> mask;
+    target_endian<uint32_t> blksize;
+    target_endian<uint64_t> attributes;
+    target_endian<uint32_t> nlink;
+    target_endian<uint32_t> uid;
+    target_endian<uint32_t> gid;
+    target_endian<uint16_t> mode;
+    target_endian<uint16_t> __spare0[1];
+    target_endian<uint64_t> ino;
+    target_endian<uint64_t> size;
+    target_endian<uint64_t> blocks;
+    target_endian<uint64_t> attributes_mask;
+    struct riscv_statx_timestamp atime;
+    struct riscv_statx_timestamp btime;
+    struct riscv_statx_timestamp ctime;
+    struct riscv_statx_timestamp mtime;
+    target_endian<uint32_t> rdev_major;
+    target_endian<uint32_t> rdev_minor;
+    target_endian<uint32_t> dev_major;
+    target_endian<uint32_t> dev_minor;
+#ifdef HAVE_STATX_MNT_ID
+    target_endian<uint64_t> mnt_id;
+    target_endian<uint64_t> __spare2;
+    target_endian<uint64_t> __spare3[12];
+#else
+    target_endian<uint64_t> __spare2[14];
+#endif
+
+  riscv_statx(const struct statx& s, htif_t* htif)
+    : mask(htif->to_target<uint32_t>(s.stx_mask)),
+      blksize(htif->to_target<uint32_t>(s.stx_blksize)),
+      attributes(htif->to_target<uint64_t>(s.stx_attributes)),
+      nlink(htif->to_target<uint32_t>(s.stx_nlink)),
+      uid(htif->to_target<uint32_t>(s.stx_uid)),
+      gid(htif->to_target<uint32_t>(s.stx_gid)),
+      mode(htif->to_target<uint16_t>(s.stx_mode)), __spare0(),
+      ino(htif->to_target<uint64_t>(s.stx_ino)),
+      size(htif->to_target<uint64_t>(s.stx_size)),
+      blocks(htif->to_target<uint64_t>(s.stx_blocks)),
+      attributes_mask(htif->to_target<uint64_t>(s.stx_attributes_mask)),
+      atime {
+        htif->to_target<int64_t>(s.stx_atime.tv_sec),
+        htif->to_target<uint32_t>(s.stx_atime.tv_nsec)
+      },
+      btime {
+        htif->to_target<int64_t>(s.stx_btime.tv_sec),
+        htif->to_target<uint32_t>(s.stx_btime.tv_nsec)
+      },
+      ctime {
+        htif->to_target<int64_t>(s.stx_ctime.tv_sec),
+        htif->to_target<uint32_t>(s.stx_ctime.tv_nsec)
+      },
+      mtime {
+        htif->to_target<int64_t>(s.stx_mtime.tv_sec),
+        htif->to_target<uint32_t>(s.stx_mtime.tv_nsec)
+      },
+      rdev_major(htif->to_target<uint32_t>(s.stx_rdev_major)),
+      rdev_minor(htif->to_target<uint32_t>(s.stx_rdev_minor)),
+      dev_major(htif->to_target<uint32_t>(s.stx_dev_major)),
+      dev_minor(htif->to_target<uint32_t>(s.stx_dev_minor)),
+#ifdef HAVE_STATX_MNT_ID
+      mnt_id(htif->to_target<uint64_t>(s.stx_mnt_id)),
+      __spare2(), __spare3()
+#else
+      __spare2()
+#endif      
+      {}
+};
+
 syscall_t::syscall_t(htif_t* htif)
   : htif(htif), memif(&htif->memif()), table(2048)
 {
@@ -79,6 +157,7 @@ syscall_t::syscall_t(htif_t* htif)
   table[79] = &syscall_t::sys_fstatat;
   table[80] = &syscall_t::sys_fstat;
   table[93] = &syscall_t::sys_exit;
+  table[291] = &syscall_t::sys_statx;
   table[1039] = &syscall_t::sys_lstat;
   table[2011] = &syscall_t::sys_getmainvars;
 
@@ -222,6 +301,21 @@ reg_t syscall_t::sys_lstat(reg_t pname, reg_t len, reg_t pbuf, reg_t a3, reg_t a
   return ret;
 }
 
+reg_t syscall_t::sys_statx(reg_t fd, reg_t pname, reg_t len, reg_t flags, reg_t mask, reg_t pbuf, reg_t a6)
+{
+  std::vector<char> name(len);
+  memif->read(pname, len, &name[0]);
+
+  struct statx buf;
+  reg_t ret = sysret_errno(statx(fds.lookup(fd), do_chroot(&name[0]).c_str(), flags, mask, &buf));
+  if (ret != (reg_t)-1)
+  {
+    riscv_statx rbuf(buf, htif);
+    memif->write(pbuf, sizeof(rbuf), &rbuf);
+  }
+  return ret;
+}
+
 #define AT_SYSCALL(syscall, fd, name, ...) \
   (syscall(fds.lookup(fd), int(fd) == RISCV_AT_FDCWD ? do_chroot(name).c_str() : (name), __VA_ARGS__))
 
diff --git a/fesvr/syscall.h b/fesvr/syscall.h
index 8294696..4915efd 100644
--- a/fesvr/syscall.h
+++ b/fesvr/syscall.h
@@ -56,6 +56,7 @@ class syscall_t : public device_t
   reg_t sys_lseek(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
   reg_t sys_fstat(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
   reg_t sys_lstat(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
+  reg_t sys_statx(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
   reg_t sys_fstatat(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
   reg_t sys_faccessat(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
   reg_t sys_fcntl(reg_t, reg_t, reg_t, reg_t, reg_t, reg_t, reg_t);
-- 
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