http://lists.debian.org/debian-arm/2007/05/msg00039.html

From: Lennert Buytenhek <buytenh@wantstofly.org>

Hi,

The reason that building nss (i.e., firefox) would segfault on ARM EABI
systems is an assumption about the layout of the jmp_buf structure in
the nspr library (which nss depends on) that does hold on old-ABI but
no longer holds on EABI.  The attached patch fixes this assumption,
and fixes the shlibsign segfault during the building of nss (it also
fixes a floating point byte order assumption.)

Looks sane?

It's of course a stupid idea to depend on a particular layout of the
jmp_buf structure in application programs, but oh well.  People write
ugly buggy code, film at 11.


--- mozilla/nsprpub/pr/src/misc/prdtoa.c.orig        2007-05-06 02:39:00.000000000 +0200
+++ mozilla/nsprpub/pr/src/misc/prdtoa.c     2007-05-06 02:39:22.000000000 +0200
@@ -59,8 +59,8 @@
     /* FIXME: deal with freelist and p5s. */
 }
 
-#if defined(__arm) || defined(__arm__) || defined(__arm26__) \
-    || defined(__arm32__)
+#if (defined(__arm) || defined(__arm__) || defined(__arm26__) \
+    || defined(__arm32__)) && !defined(__ARM_EABI__) && !defined(__ARMEB__)
 #define IEEE_ARM
 #elif defined(IS_LITTLE_ENDIAN)
 #define IEEE_8087
--- mozilla/nsprpub/pr/include/md/_linux.h.orig      2007-05-06 02:39:45.000000000 +0200
+++ mozilla/nsprpub/pr/include/md/_linux.h   2007-05-06 02:40:57.000000000 +0200
@@ -346,7 +346,7 @@
 #error "Linux/MIPS pre-glibc2 not supported yet"
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 
-#elif defined(__arm__)
+#elif defined(__arm__) && !defined(__ARM_EABI__)
 /* ARM/Linux */
 #if defined(__GLIBC__) && __GLIBC__ >= 2
 #define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[20]
@@ -358,6 +358,18 @@
 #error "ARM/Linux pre-glibc2 not supported yet"
 #endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
 
+#elif defined(__arm__) && defined(__ARM_EABI__)
+/* ARM/Linux */
+#if defined(__GLIBC__) && __GLIBC__ >= 2
+#define _MD_GET_SP(_t) (_t)->md.context[0].__jmpbuf[8]
+#define _MD_SET_FP(_t, val) ((_t)->md.context[0].__jmpbuf[7] = (val))
+#define _MD_GET_SP_PTR(_t) &(_MD_GET_SP(_t))
+#define _MD_GET_FP_PTR(_t) (&(_t)->md.context[0].__jmpbuf[7])
+#define _MD_SP_TYPE __ptr_t
+#else
+#error "ARM/Linux pre-glibc2 not supported yet"
+#endif /* defined(__GLIBC__) && __GLIBC__ >= 2 */
+
 #else
 
 #error "Unknown CPU architecture"