1 files changed, 87 insertions, 0 deletions
diff --git a/libgloss/mips/uhi/uhi_exit.c b/libgloss/mips/uhi/uhi_exit.c
new file mode 100644
index 0000000..5d4384e
--- /dev/null
+++ b/libgloss/mips/uhi/uhi_exit.c
@@ -0,0 +1,87 @@
+/*
+ * 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	 void __exit (int32_t exit_code);
+ *
+ *		 Parameters:
+ *		   exit_code - Exit code
+ *
+ *		 Return:
+ *		   None
+ *
+ *		 Arguments to syscall:
+ *		   $25 - Operation code for exit
+ *		   $4 - Exit code
+ *
+ * @Description  Transfer control to the debug port
+*/
+
+#include <stdint.h>
+#include <errno.h>
+#include <mips/uhi_syscalls.h>
+#include <mips/hal.h>
+
+void __return_to_boot (int32_t exit_code) __attribute__((noreturn))
+  __attribute__((weak));
+
+/* Defined in .ld file */
+extern char __use_excpt_boot[];
+
+/* _exit has been declared weak to allow its defination in the application */
+int _MIPS_HAL_NOMIPS16
+__exit (int exit_code)
+{
+  register int32_t arg1 asm ("$4") = exit_code;
+  register int32_t op asm ("$25") = __MIPS_UHI_EXIT;
+  register int32_t ret asm ("$2") = __MIPS_UHI_SYSCALL_NUM;
+
+  __asm__ __volatile__ (" # _exit(%0 %1) op=%2\n"
+			SYSCALL (__MIPS_UHI_SYSCALL_NUM)
+			: "+r" (ret), "+r" (arg1)
+			: "r" (op)
+			: "$3", "$5");
+
+  /* exit wasn't handled, return to caller of _start 
+   * __use_excpt_boot has following values
+   * 0 = Do not use exception handler present in boot
+   * 1 = Use exception handler present in boot if BEV 
+	 is 0 at startup
+   * 2 = Always use exception handler present in boot
+  */
+  if (((long) __use_excpt_boot == 2
+       || ((long) __use_excpt_boot == 1
+	   && __get_startup_BEV
+	   && __get_startup_BEV () == 0))
+      && __return_to_boot)
+    __return_to_boot (exit_code);
+
+  /* Infinite loop if control returns.  */
+  __exit (exit_code);
+  return exit_code;
+}