add m68k port

three ABIs are supported: the default with 68881 80-bit fpu format and
results returned in floating point registers, softfloat-only with the
same format, and coldfire fpu with IEEE single/double only. only the
first is tested at all, and only under qemu which has fpu emulation
bugs.

basic functionality smoke tests have been performed for the most
common arch-specific breakage via libc-test and qemu user-level
emulation. some sysvipc failures remain, but are shared with other big
endian archs and will be fixed separately.

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/m68k/bits/float.h b/arch/m68k/bits/float.h
new file mode 100644
index 00000000..fd02a132
--- /dev/null
+++ b/arch/m68k/bits/float.h
@@ -0,0 +1,39 @@
+#if !__mcffpu__
+
+#define FLT_EVAL_METHOD 2
+
+#define LDBL_TRUE_MIN 3.6451995318824746025e-4951L
+#define LDBL_MIN     3.3621031431120935063e-4932L
+#define LDBL_MAX     1.1897314953572317650e+4932L
+#define LDBL_EPSILON 1.0842021724855044340e-19L
+
+#define LDBL_MANT_DIG 64
+#define LDBL_MIN_EXP (-16381)
+#define LDBL_MAX_EXP 16384
+
+#define LDBL_DIG 18
+#define LDBL_MIN_10_EXP (-4931)
+#define LDBL_MAX_10_EXP 4932
+
+#define DECIMAL_DIG 21
+
+#else
+
+#define FLT_EVAL_METHOD 0
+
+#define LDBL_TRUE_MIN 4.94065645841246544177e-324L
+#define LDBL_MIN 2.22507385850720138309e-308L
+#define LDBL_MAX 1.79769313486231570815e+308L
+#define LDBL_EPSILON 2.22044604925031308085e-16L
+
+#define LDBL_MANT_DIG 53
+#define LDBL_MIN_EXP (-1021)
+#define LDBL_MAX_EXP 1024
+
+#define LDBL_DIG 15
+#define LDBL_MIN_10_EXP (-307)
+#define LDBL_MAX_10_EXP 308
+
+#define DECIMAL_DIG 17
+
+#endif