1 files changed, 78 insertions, 0 deletions
diff --git a/libgloss/mips/uhi/uhi_pwrite.c b/libgloss/mips/uhi/uhi_pwrite.c
new file mode 100644
index 0000000..8a1529a
--- /dev/null
+++ b/libgloss/mips/uhi/uhi_pwrite.c
@@ -0,0 +1,78 @@
+/*
+ * Copyright (C) 2014-2018 MIPS Tech, LLC
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. Neither the name of the copyright holder 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.
+*/
+
+/*
+ * @Synopsis	 pwrite
+ *
+ *		 Arguments to syscall:
+ *		   $25 - Operation code for pwrite
+ *		   $4 - File handle
+ *		   $5 - Buffer to write
+ *		   $6 - Length of the buffer
+ *		   $7 - Offset in file at which bytes to be written
+ *
+ *		 Return from syscall:
+ *		   $2 - Number of bytes written
+ *		   $3 - errno
+ *
+ * @Description  Write to a file at a given offset
+*/
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <errno.h>
+#include <mips/uhi_syscalls.h>
+#include <mips/hal.h>
+
+ssize_t _MIPS_HAL_NOMIPS16
+pwrite (int fd, const void *buf, size_t count, off_t offset)
+{
+  register int32_t arg1 asm ("$4") = fd;
+  register const void *arg2 asm ("$5") = buf;
+  register int32_t arg3 asm ("$6") = count;
+  register int32_t arg4 asm ("$7") = offset;
+  register int32_t op asm ("$25") = __MIPS_UHI_PWRITE;
+  register int32_t ret asm ("$2") = __MIPS_UHI_SYSCALL_NUM;
+  register int32_t new_errno asm ("$3") = 0;
+
+  __asm__ __volatile__ (" # %0,%1 = pwrite(%2, %3, %4 %5) op=%6\n"
+			SYSCALL (__MIPS_UHI_SYSCALL_NUM)
+			: "+r" (ret), "=r" (new_errno), "+r" (arg1),
+			  "+r" (arg2)
+			: "r" (arg3), "r" (arg4), "r" (op));
+
+  if (ret == -1)
+    {
+      /* Do a dance to set errno, errno is a function call that can
+	 clobber $3.  */
+      volatile uint32_t errno_tmp = new_errno;
+      errno = errno_tmp;
+    }
+
+  return ret;
+}