sh3eb: add suport for the sh3eb softfp platform

Make.inc

@@ -131,6 +131,10 @@ ifeq ($(ARCH),wasm32)
 CFLAGS_arch += -ffreestanding -nostdlib -nostdinc --target=wasm32-unknown-unknown
 endif
 
+ifeq ($(ARCH),sh3eb)
+CFLAGS_arch += -ffreestanding -nostdlib -m3 -mb
+endif
+
 # Add our "arch"-related FLAGS in.  We separate arch-related flags out so that
 # we can conveniently get at them for targets that don't want the rest of
 # *FLAGS_add, such as the testing Makefile targets

Makefile

@@ -53,7 +53,7 @@ endif
 
 
 OLM_LIBS := libopenlibm.a
-ifneq ($(ARCH), wasm32)
+ifeq ($(filter wasm32 sh3eb,$(ARCH)),)
 OLM_LIBS += libopenlibm.$(OLM_MAJOR_MINOR_SHLIB_EXT)
 endif
 

include/openlibm_fenv.h

@@ -14,6 +14,8 @@
 #include <openlibm_fenv_mips.h>
 #elif defined(__s390__)
 #include <openlibm_fenv_s390.h>
+#elif defined(__sh3__)
+#include <openlibm_fenv_sh3eb.h>
 #else
 #error "Unsupported platform"
 #endif

sh3eb/Make.files

@@ -0,0 +1 @@
+$(CUR_SRCS) = fenv.c

sh3eb/assert.h

@@ -0,0 +1,2 @@
+#pragma once
+#define assert(b)

sh3eb/ctype.h

@@ -0,0 +1,7 @@
+#pragma once
+
+static int isxdigit(int c)
+{
+	return (c >= '0' && c <= '9') || (c >= 'A' && c <= 'F') ||
+		(c >= 'a' && c <= 'f');
+}

sh3eb/string.h

@@ -0,0 +1,4 @@
+#pragma once
+#include <stddef.h>
+
+void *memset(void *mem, int fill, size_t size);

src/fpmath.h

@@ -43,6 +43,8 @@
 #include "mips_fpmath.h"
 #elif defined(__s390__)
 #include "s390_fpmath.h"
+#elif defined(__sh3__)
+#include "sh3eb_fpmath.h"
 #endif
 
 /* Definitions provided directly by GCC and Clang. */

src/sh3eb_fpmath.h

@@ -29,7 +29,7 @@
 union IEEEl2bits {
 	long double	e;
 	struct {
-#ifndef __MIPSEB__
+#ifndef __BIG_ENDIAN__
 		unsigned int	manl	:32;
 		unsigned int	manh	:20;
 		unsigned int	exp	:11;