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libmach: pc64 uses 4K pages, IP -> PC

--- a/sys/src/libmach/6.c

+++ b/sys/src/libmach/6.c

@@ -40,8 +40,8 @@

 	{"TYPE",	REGOFF(type), 	RINT, 'Y'},

 	{"TRAP",	REGOFF(type), 	RINT, 'Y'},	/* alias for acid */

 	{"ERROR",	REGOFF(error),	RINT, 'Y'},

-	{"IP",		REGOFF(ip),	RINT, 'Y'},

-	{"PC",		REGOFF(ip),	RINT, 'Y'},	/* alias for acid */

+	{"IP",		REGOFF(pc),	RINT, 'Y'},

+	{"PC",		REGOFF(pc),	RINT, 'Y'},	/* alias for acid */

 	{"CS",		REGOFF(cs),	RINT, 'Y'},

 	{"FLAGS",	REGOFF(flags),	RINT, 'Y'},

 	{"SP",		REGOFF(sp),	RINT, 'Y'},

@@ -105,8 +105,8 @@

 	0,			/* link register */

 	"setSB",		/* static base register name (bogus anyways) */

 	0,			/* static base register value */

-	0x200000,		/* page size */

-	0xfffffffff0110000ull,	/* kernel base */

+	0x1000,			/* page size */

+	0xffffffff80110000ull,	/* kernel base */

 	0xffff800000000000ull,	/* kernel text mask */

 	0x00007ffffffff000ull,	/* user stack top */

 	1,			/* quantization of pc */