PERFORCE change 219360 for review

[Robert Watson]

http://p4web.freebsd.org/@@219360?ac=10

Change 219360 by rwatson at rwatson_svr_ctsrd_mipsbuild on 2012/10/30 22:28:41

	Teach CheriBSD's DDB "show cheri" command to print out capability
	coprocessor exception cause information, which arrived in CHERI
	ISAv2.

Affected files ...

.. //depot/projects/ctsrd/cheribsd/src/sys/mips/cheri/cheri.c#3 edit

Differences ...

==== //depot/projects/ctsrd/cheribsd/src/sys/mips/cheri/cheri.c#3 (text+ko) ====

@@ -259,6 +259,7 @@
  */
 DB_SHOW_COMMAND(cheri, ddb_dump_cheri)
 {
+	register_t cause;
 
 	db_printf("CHERI registers\n");
 	DB_CHERI_REG_PRINT(0);
@@ -293,6 +294,9 @@
 	DB_CHERI_REG_PRINT(29);
 	DB_CHERI_REG_PRINT(30);
 	DB_CHERI_REG_PRINT(31);
+	CHERI_CGETCAUSE(cause);
+	db_printf("CHERI cause: ExcCode: %02x RegNum: %02x\n",
+	    (uint8_t)((cause >> 8) & 0xff), (uint8_t)(cause & 0x1f));
 }
 
 /*