OpenBSD: arm fix

Disable warning softfloat. OpenBSD works fine.
save/restore s0-s15 during memcpy call for structs
update configure script. Works now on raspberry pi/All BSD
Add eabi_mem.. functions in armeabi.c for OpenBSD
Fix fp register in tccrun.c for OpenBSD

arm-gen.c

@@ -177,7 +177,8 @@ ST_FUNC void arm_init(struct TCCState *s)
 
     float_abi = s->float_abi;
 #ifndef TCC_ARM_HARDFLOAT
-# warning "soft float ABI currently not supported: default to softfp"
+// XXX: Works on OpenBSD
+// # warning "soft float ABI currently not supported: default to softfp"
 #endif
 }
 #else
@@ -1160,7 +1161,10 @@ static int copy_params(int nb_args, struct plan *plan, int todo)
             o(0xE28D0000|(intr(r)<<12)|padding); /* add r, sp, padding */
             vset(&vtop->type, r | VT_LVAL, 0);
             vswap();
+	    /* XXX: optimize. Save all register because memcpy can use them */
+	    o(0xED2D0A00|(0&1)<<22|(0>>1)<<12|16); /* vpush {s0-s15} */
             vstore(); /* memcpy to current sp + potential padding */
+	    o(0xECBD0A00|(0&1)<<22|(0>>1)<<12|16); /* vpop {s0-s15} */
 
             /* Homogeneous float aggregate are loaded to VFP registers
                immediately since there is no way of loading data in multiple

lib/armeabi.c

@@ -499,3 +499,39 @@ void __aeabi_uidivmod(unsigned num, unsigned den)
 {
     uidiv_t_return(aeabi_uidivmod(num, den));
 }
+
+/* Some targets do not have all eabi calls (OpenBSD) */
+typedef __SIZE_TYPE__ size_t;
+extern void *memcpy(void *dest, const void *src, size_t n);
+extern void *memmove(void *dest, const void *src, size_t n);
+extern void *memset(void *s, int c, size_t n);
+
+void *
+__aeabi_memcpy (void *dest, const void *src, size_t n)
+{
+    return memcpy (dest, src, n);
+}
+
+void *
+__aeabi_memmove (void *dest, const void *src, size_t n)
+{
+    return memmove (dest, src, n);
+}
+
+void *
+__aeabi_memmove4 (void *dest, const void *src, size_t n)
+{
+    return memmove (dest, src, n);
+}
+
+void *
+__aeabi_memmove8 (void *dest, const void *src, size_t n)
+{
+    return memmove (dest, src, n);
+}
+
+void *
+__aeabi_memset (void *s, size_t n, int c)
+{
+    return memset (s, c, n);
+}

tccrun.c

@@ -698,7 +698,7 @@ static void rt_getcontext(ucontext_t *uc, rt_context *rc)
     rc->ip = uc->uc_mcontext.__gregs[_REG_PC];
     rc->fp = uc->uc_mcontext.__gregs[_REG_FP];
 # elif defined(__OpenBSD__)
-    rc->ip = uc->sc_pc;
+    rc->fp = uc->sc_r11;
     rc->fp = uc->sc_fpreg[29];
 # elif defined(__QNX__)
     rc->ip = uc->uc_mcontext.cpu.gpr[15];