update for routerboard.  change vdb to match hardware, add
elf header type, etc.  a few random fixes have slipped in.

Reference: /n/atom/patch/applied2013/libmachrb
Date: Wed Jul 31 17:36:06 CES 2013
Signed-off-by: quanstro@quanstro.net

--- /sys/src/libmach/vdb.c	Wed Jul 31 17:35:03 2013
+++ /sys/src/libmach/vdb.c	Wed Jul 31 17:35:04 2013
@@ -28,7 +28,12 @@
 	mipsexcep,		/* print exception */
 	0,			/* breakpoint fixup */
 	beieeesftos,		/* single precision float printer */
-	beieeedftos,		/* double precisioin float printer */
+	/*
+	 * this works for doubles in memory, but FP register pairs have
+	 * the words in little-endian order, so they will print as
+	 * denormalised doubles.
+	 */
+	beieeedftos,		/* double precision float printer */
 	mipsfoll,		/* following addresses */
 	mipsinst,		/* print instruction */
 	mipsdas,		/* dissembler */
@@ -48,7 +53,7 @@
 	mipsexcep,		/* print exception */
 	0,			/* breakpoint fixup */
 	leieeesftos,		/* single precision float printer */
-	leieeedftos,		/* double precisioin float printer */
+	leieeedftos,		/* double precision float printer */
 	mipsfoll,		/* following addresses */
 	mipsinst,		/* print instruction */
 	mipsdas,		/* dissembler */
@@ -71,7 +76,7 @@
 	mipsexcep,		/* print exception */
 	0,			/* breakpoint fixup */
 	leieeesftos,		/* single precision float printer */
-	leieeedftos,		/* double precisioin float printer */
+	leieeedftos,		/* double precision float printer */
 	mipsfoll,		/* following addresses */
 	mipsinst,		/* print instruction */
 	mipsdas,		/* dissembler */
@@ -94,7 +99,7 @@
 	mipsexcep,		/* print exception */
 	0,			/* breakpoint fixup */
 	beieeesftos,		/* single precision float printer */
-	beieeedftos,		/* double precisioin float printer */
+	beieeedftos,		/* double precision float printer */
 	mipsfoll,		/* following addresses */
 	mipsinst,		/* print instruction */
 	mipsdas,		/* dissembler */
@@ -131,7 +136,8 @@
 	long c;
 
 	c = (*rget)(map, "CAUSE");
-	if(c & 0x00002000)	/* INTR3 */
+	/* i don't think this applies to any current machines */
+	if(0 && c & 0x00002000)	/* INTR3 */
 		e = 16;		/* Floating point exception */
 	else
 		e = (c>>2)&0x0F;
--- /sys/src/libmach/v.c	Wed Jul 31 17:35:05 2013
+++ /sys/src/libmach/v.c	Wed Jul 31 17:35:05 2013
@@ -106,9 +106,9 @@
 	"R31",		/* name of link register */
 	"setR30",	/* static base register name */
 	0,		/* value */
-	0x1000,		/* page size */
-	0xC0000000ULL,	/* kernel base */
-	0x40000000ULL,	/* kernel text mask */
+	16*1024,	/* page size */
+	0x80000000ULL,	/* kernel base */
+	0x80000000ULL,	/* kernel text mask */
 	0x7FFFFFFFULL,	/* user stack top */
 	4,		/* quantization of pc */
 	4,		/* szaddr */
--- /sys/src/libmach/sym.c	Wed Jul 31 17:35:07 2013
+++ /sys/src/libmach/sym.c	Wed Jul 31 17:35:08 2013
@@ -687,6 +687,8 @@
 	top = ntxt;
 	for (mid = (bot+top)/2; mid < top; mid = (bot+top)/2) {
 		sp = txt[mid].sym;
+		if(sp == nil)
+			return -1;
 		if(val < sp->value)
 			top = mid;
 		else if(mid != ntxt-1 && val >= txt[mid+1].sym->value)
@@ -712,6 +714,8 @@
 	val = addr;
 	for(mid = (bot+top)/2; mid < top; mid = (bot+top)/2) {
 		sp = globals[mid];
+		if(sp == nil)
+			return -1;
 		if(val < sp->value)
 			top = mid;
 		else if(mid < nglob-1 && val >= globals[mid+1]->value)
--- /sys/src/libmach/5.c	Wed Jul 31 17:35:09 2013
+++ /sys/src/libmach/5.c	Wed Jul 31 17:35:10 2013
@@ -2,10 +2,10 @@
  * arm definition
  */
 #include <u.h>
+#include <libc.h>
 #include <bio.h>
 #include "/arm/include/ureg.h"
 #include <mach.h>
-
 
 #define	REGOFF(x)	(ulong) (&((struct Ureg *) 0)->x)
 
--- /sys/src/libmach/elf.h	Wed Jul 31 17:35:10 2013
+++ /sys/src/libmach/elf.h	Wed Jul 31 17:35:11 2013
@@ -119,6 +119,7 @@
 	I860 = 7,		/* Intel i860 */
 	MIPS = 8,		/* Mips R2000 */
 	S370 = 9,		/* Amdhal	*/
+	MIPSR4K = 10,		/* Mips R4000 */
 	SPARC64 = 18,		/* Sun SPARC v9 */
 	POWER = 20,		/* PowerPC */
 	POWER64 = 21,		/* PowerPC64 */
--- /sys/src/libmach/8.c	Wed Jul 31 17:35:12 2013
+++ /sys/src/libmach/8.c	Wed Jul 31 17:35:12 2013
@@ -2,6 +2,7 @@
  * 386 definition
  */
 #include <u.h>
+#include <libc.h>
 #include <bio.h>
 #include "/386/include/ureg.h"
 #include <mach.h>
--- /sys/src/libmach/5.c	Wed Jul 31 17:35:13 2013
+++ /sys/src/libmach/5.c	Wed Jul 31 17:35:14 2013
@@ -2,10 +2,10 @@
  * arm definition
  */
 #include <u.h>
+#include <libc.h>
 #include <bio.h>
 #include "/arm/include/ureg.h"
 #include <mach.h>
-
 
 #define	REGOFF(x)	(ulong) (&((struct Ureg *) 0)->x)