add or1k (OpenRISC 1000) architecture port

With the exception of a fenv implementation, the port is fully featured.
The port has been tested in or1ksim, the golden reference functional
simulator for OpenRISC 1000.
It passes all libc-test tests (except the math tests that
requires a fenv implementation).

The port assumes an or1k implementation that has support for
atomic instructions (l.lwa/l.swa).

Although it passes all the libc-test tests, the port is still
in an experimental state, and has yet experienced very little
'real-world' use.

arch/or1k/reloc.h

@@ -0,0 +1,47 @@
+#include <string.h>
+#include <elf.h>
+#include <endian.h>
+
+#define LDSO_ARCH "or1k"
+
+#define TPOFF_K 0
+
+static int remap_rel(int type)
+{
+	switch(type) {
+	case R_OR1K_32:
+		return REL_SYMBOLIC;
+	case R_OR1K_GLOB_DAT:
+		return REL_GOT;
+	case R_OR1K_JMP_SLOT:
+		return REL_PLT;
+	case R_OR1K_RELATIVE:
+		return REL_RELATIVE;
+	case R_OR1K_COPY:
+		return REL_COPY;
+	case R_OR1K_TLS_DTPMOD:
+		return REL_DTPMOD;
+	case R_OR1K_TLS_DTPOFF:
+		return REL_DTPOFF;
+	case R_OR1K_TLS_TPOFF:
+		return REL_TPOFF;
+	}
+	return 0;
+}
+
+#include "syscall.h"
+void __reloc_self(int c, size_t *a, size_t *dynv)
+{
+	char dot = '.', ex = 'x';
+	char *base;
+	size_t t[20], n;
+	for (a+=c+1; *a; a++);
+	for (a++; *a; a+=2) if (*a<20) t[*a] = a[1];
+	base = (char *)t[AT_BASE];
+	if (!base) base = (char *)(t[AT_PHDR] & -t[AT_PAGESZ]);
+	for (a=dynv; *a; a+=2) if (*a<20) t[*a] = a[1];
+	n = t[DT_RELASZ];
+	for (a=(void *)(base+t[DT_RELA]); n; a+=3, n-=12)
+		if (a[1]%256 == R_OR1K_RELATIVE)
+			*(size_t *)(base+a[0]) = (size_t)base + a[2];
+}