2002-11-12 Jeff Johnston <jjohnstn@redhat.com>

*  mips/Makefile.in: Add cygmon support.
        *  mips/configure.in: Ditto.
        *  mips/configure: Regenerated.
        *  mips/crt0_cygmon.S: New file.
        *  mips/cygmon.c: Ditto.
        *  mips/pmon.S: Minor formatting and copyright changes.
        *  mips/crt0.S: Ditto.

libgloss/mips/cygmon.c

@@ -0,0 +1,87 @@
+/* cygmon.c -- Glue code for linking apps to run on top of Cygmon.
+ *
+ * Copyright (c) 1998, 1999, 2000 Red Hat, Inc.
+ *
+ * The authors hereby grant permission to use, copy, modify, distribute,
+ * and license this software and its documentation for any purpose, provided
+ * that existing copyright notices are retained in all copies and that this
+ * notice is included verbatim in any distributions. No written agreement,
+ * license, or royalty fee is required for any of the authorized uses.
+ * Modifications to this software may be copyrighted by their authors
+ * and need not follow the licensing terms described here, provided that
+ * the new terms are clearly indicated on the first page of each file where
+ * they apply.
+ */
+
+#include "syscall.h"
+
+int
+write ( int file,
+        char *buf,
+        int nbytes)
+{
+  return sysCall(SYS_write, file, (unsigned long)buf, nbytes);
+}
+
+int
+read (int file,
+      char *buf,
+      int nbytes)
+{
+  return sysCall(SYS_read, file, (unsigned long)buf, nbytes);
+}
+
+int
+outbyte (unsigned char c)
+{
+  return sysCall(SYS_write, 0, (unsigned long)&c, 1);
+}
+
+unsigned char
+inbyte (void)
+{
+  char c;
+  sysCall(SYS_read, 0, (unsigned long)&c, 1);
+  return c;
+}
+
+
+/* Structure filled in by get_mem_info.  Only the size field is
+   actually used (by sbrk), so the others aren't even filled in.  */
+struct s_mem
+{
+  unsigned int size;
+  unsigned int icsize;
+  unsigned int dcsize;
+};
+
+// Perform a system call.
+// Unused parameters should be set to 0.
+int sysCall(unsigned long func, unsigned long p1, unsigned long p2, unsigned long p3)
+{
+  int ret = 0;
+  asm volatile ( "
+          move $4, %1
+          move $5, %2
+          move $6, %3
+          move $7, %4
+          syscall 
+          nop
+          move %0, $2" : "=r"(ret) : "r"(func), "r"(p1), "r"(p2), "r"(p3));
+  return ret;
+}
+
+// These need to be kept in sync with the definitions in Cygmon.
+#define SYS_meminfo     1001
+
+void *
+get_mem_info (mem)
+     struct s_mem *mem;
+{
+  unsigned long totmem = 0, topmem = 0;
+  int numbanks;
+
+  numbanks = sysCall(SYS_meminfo, (unsigned long)&totmem, (unsigned long)&topmem, 0);
+  mem->size = totmem;
+  return (void*)topmem;
+}