From http://www.ltc.com/~brad/mips/glibc-2.2.5-mips-build-gmon.diff
See http://www.ltc.com/~brad/mips/mips-cross-toolchain.html

--- glibc-2.2.5/sysdeps/mips/machine-gmon.h	2001-08-13 04:42:44.000000000 -0400
+++ glibc-2.2.5/sysdeps/mips/machine-gmon.h	2002-09-25 17:10:59.000000000 -0400
@@ -17,42 +17,52 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#define _MCOUNT_DECL static void __mcount
+#define _MCOUNT_DECL(frompc,selfpc) \
+static void __attribute_used__ __mcount (u_long frompc, u_long selfpc)
 
 /* Call __mcount with our the return PC for our caller,
    and the return PC our caller will return to.  */
 #ifdef __PIC__
 #define CPLOAD ".cpload $25;"
+#define CPRESTORE ".cprestore 44\n\t"
 #else
 #define CPLOAD
+#define CPRESTORE
 #endif
 
 #define MCOUNT asm(\
-	".globl _mcount;" \
-	".align 2;" \
-	".type _mcount,@function;" \
-        "_mcount:;" \
-        ".set noreorder;" \
-        ".set noat;" \
+	".globl _mcount;\n\t" \
+	".align 2;\n\t" \
+	".type _mcount,@function;\n\t" \
+	".ent _mcount\n\t" \
+        "_mcount:\n\t" \
+        ".frame $sp,44,$31\n\t" \
+        ".set noreorder;\n\t" \
+        ".set noat;\n\t" \
         CPLOAD \
-        "sw $4,8($29);" \
-        "sw $5,12($29);" \
-        "sw $6,16($29);" \
-        "sw $7,20($29);" \
-        "sw $1,0($29);" \
-        "sw $31,4($29);" \
-        "move $5,$31;" \
-        "move $4,$1;" \
-        "jal __mcount;" \
-	"nop;" \
-        "lw $4,8($29);" \
-        "lw $5,12($29);" \
-        "lw $6,16($29);" \
-        "lw $7,20($29);" \
-        "lw $31,4($29);" \
-        "lw $1,0($29);" \
-        "addu $29,$29,8;" \
-        "j $31;" \
-        "move $31,$1;" \
-        ".set reorder;" \
-        ".set at");
+	"subu $29,$29,48;\n\t" \
+	CPRESTORE \
+        "sw $4,24($29);\n\t" \
+        "sw $5,28($29);\n\t" \
+        "sw $6,32($29);\n\t" \
+        "sw $7,36($29);\n\t" \
+        "sw $2,40($29);\n\t" \
+        "sw $1,16($29);\n\t" \
+        "sw $31,20($29);\n\t" \
+        "move $5,$31;\n\t" \
+        "move $4,$1;\n\t" \
+        "jal __mcount;\n\t" \
+        "nop;\n\t" \
+        "lw $4,24($29);\n\t" \
+        "lw $5,28($29);\n\t" \
+        "lw $6,32($29);\n\t" \
+        "lw $7,36($29);\n\t" \
+        "lw $2,40($29);\n\t" \
+        "lw $31,20($29);\n\t" \
+        "lw $1,16($29);\n\t" \
+        "addu $29,$29,56;\n\t" \
+        "j $31;\n\t" \
+        "move $31,$1;\n\t" \
+        ".set reorder;\n\t" \
+        ".set at\n\t" \
+        ".end _mcount");