Add initial support for Gaisler-BCC with Sparc

Slight modifications and documentation to get wolfSSL working with
Gaisler Sparc CPUs and their cross-compilers.

.wolfssl_known_macro_extras

@@ -638,6 +638,7 @@ WOLFSSL_FRDM_K64
 WOLFSSL_FRDM_K64_JENKINS
 WOLFSSL_FUNC_TIME
 WOLFSSL_FUNC_TIME_LOG
+WOLFSSL_GAISLER_BCC
 WOLFSSL_GEN_CERT
 WOLFSSL_GETRANDOM
 WOLFSSL_GNRC
@@ -965,6 +966,7 @@ __ppc__
 __riscv
 __riscv_xlen
 __s390x__
+__sparc
 __sparc64__
 __sun
 __svr4__

IDE/Gaisler-BCC/README.md

@@ -0,0 +1,65 @@
+# Gaisler BCC
+
+This document outlines how to compile for the Gaisler LEON range of Sparc CPUs
+using the BCC2 toolkit. The steps here should also work for the original BCC.
+
+## Compiler
+
+In the examples in this document, a Linux computer is used as a cross compiler
+and the compilers have been extracted to `/opt`. You can install them elsewhere,
+but please adjust commands accordingly.
+
+### Bare-metal
+
+To compile for bare-metal, you need to download the BCC2 binaries from
+[here](https://www.gaisler.com/index.php/downloads/compilers). You can use
+either the GCC or CLang version, but do note that you will need to set the
+CFLAG `-std=c99` to compile in CLang.
+
+### Linux
+
+For Linux, you will need the "GNU toolchains for LEON and NOEL" from
+[this link](https://www.gaisler.com/index.php/downloads/linux).
+
+## Compiling
+
+### Bare metal
+
+Copy the file `examples/config/user_settings_template.h` to `user_settings.h` in
+the root of the source code. Then edit this to add the following:
+
+```c
+#define WOLFSSL_GAISLER_BCC
+#define WOLFSSL_GENSEED_FORTEST
+```
+
+The first `#define` is only required to compile the wolfCrypt benchmark.
+
+**Note:** that most Gaisler LEON processors do not have a good source of
+entropy for the RNG. It is recommended an external entropy source is used when
+developing for production.
+
+You can then compile with the following. Change `leon5` to the LEON CPU version
+used:
+
+```sh
+export CC=/opt/sparc-bcc-2.3.1-gcc/bin/sparc-gaisler-elf-gcc
+export CXX=/opt/sparc-bcc-2.3.1-gcc/bin/sparc-gaisler-elf-g++
+export CFLAGS="-mcpu=leon5"
+
+./configure --host=sparc --enable-usersettings --disable-examples --enable-static
+make
+```
+
+### Linux
+
+To compile for Linux on the LEON use the following commands:
+
+```sh
+export CC=/opt/sparc-gaisler-linux5.10/bin/sparc-gaisler-linux5.10-gcc
+export CXX=/opt/sparc-gaisler-linux5.10/bin/sparc-gaisler-linux5.10-g++
+export CFLAGS="-mcpu=leon5"
+
+./configure --host=sparc-linux
+make
+```

IDE/Gaisler-BCC/include.am

@@ -0,0 +1,4 @@
+# vim:ft=automake
+# All paths should be given relative to the root
+
+EXTRA_DIST+= IDE/Gaisler-BCC/README.md

IDE/include.am

@@ -14,6 +14,7 @@ include IDE/ECLIPSE/RTTHREAD/include.am
 include IDE/ECLIPSE/SIFIVE/include.am
 include IDE/Espressif/include.am
 include IDE/GCC-ARM/include.am
+include IDE/Gaisler-BCC/include.am
 include IDE/HEXAGON/include.am
 include IDE/IAR-MSP430/include.am
 include IDE/Infineon/include.am

wolfcrypt/benchmark/benchmark.c

@@ -14701,6 +14701,16 @@ void bench_sphincsKeySign(byte level, byte optim)
         return (double)ns / 1000000000.0;
     }
 
+#elif defined(WOLFSSL_GAISLER_BCC)
+
+    #include <bcc/bcc.h>
+    double current_time(int reset)
+    {
+        (void)reset;
+        uint32_t us = bcc_timer_get_us();
+        return (double)us / 1000000.0;
+    }
+
 #else
 
     #include <time.h>

wolfssl/wolfcrypt/settings.h

@@ -2785,6 +2785,10 @@ extern void uITRON4_free(void *p) ;
     #undef WOLFSSL_SP_INT_DIGIT_ALIGN
     #define WOLFSSL_SP_INT_DIGIT_ALIGN
 #endif
+#if defined(__sparc)
+    #undef WOLFSSL_SP_INT_DIGIT_ALIGN
+    #define WOLFSSL_SP_INT_DIGIT_ALIGN
+#endif
 #if defined(__APPLE__) || defined(WOLF_C89)
     #define WOLFSSL_SP_NO_DYN_STACK
 #endif