sim: ppc: avoid "PAGE_SIZE" name

This define is used for a particular target and depends on the
simulated CPU hardware.  It has no relation to the host CPU that
the sim is running on.  So rename the common "PAGE_SIZE" here to
better reflect its usage and avoid conflicts with system headers.

sim/ppc/ChangeLog

@@ -1,3 +1,8 @@
+2021-06-17  Mike Frysinger  <vapier@gentoo.org>
+
+	* igen.c (gen_semantics_h): Rename PAGE_SIZE to MPC860C0_PAGE_SIZE.
+	* ppc-instructions: Likewise.
+
 2021-06-16  Mike Frysinger  <vapier@gentoo.org>
 
 	* configure.ac: Delete AC_EXEEXT call.

sim/ppc/igen.c

@@ -182,7 +182,7 @@ gen_semantics_h(insn_table *table,
   lf_printf(file, "\n");
   if ((code & generate_calls)) {
     lf_printf(file, "extern int option_mpc860c0;\n");
-    lf_printf(file, "#define PAGE_SIZE 0x1000\n");
+    lf_printf(file, "#define MPC860C0_PAGE_SIZE 0x1000\n");
     lf_printf(file, "\n");
     lf_printf(file, "PSIM_EXTERN_SEMANTICS(void)\n");
     lf_printf(file, "semantic_init(device* root);\n");

sim/ppc/ppc-instructions

@@ -1537,7 +1537,7 @@ void::function::invalid_zero_divide_operation:cpu *processor, unsigned_word cia,
 	  If this is a forward branch and it is near the end of a page,
 	  we've detected a problematic branch. */
 	  if (succeed && NIA > CIA) {
-	    if (PAGE_SIZE - (CIA & (PAGE_SIZE-1)) <= option_mpc860c0)
+	    if (MPC860C0_PAGE_SIZE - (CIA & (MPC860C0_PAGE_SIZE-1)) <= option_mpc860c0)
 	      program_interrupt(processor, cia, mpc860c0_instruction_program_interrupt);
 	  }
 	}
@@ -1579,7 +1579,7 @@ void::function::invalid_zero_divide_operation:cpu *processor, unsigned_word cia,
 	  If this is a forward branch and it is near the end of a page,
 	  we've detected a problematic branch. */
 	  if (succeed && NIA > CIA) {
-	    if (PAGE_SIZE - (CIA & (PAGE_SIZE-1)) <= option_mpc860c0)
+	    if (MPC860C0_PAGE_SIZE - (CIA & (MPC860C0_PAGE_SIZE-1)) <= option_mpc860c0)
 	      program_interrupt(processor, cia, mpc860c0_instruction_program_interrupt);
 	  }
 	}
@@ -1610,7 +1610,7 @@ void::function::invalid_zero_divide_operation:cpu *processor, unsigned_word cia,
 	  If this is a forward branch and it is near the end of a page,
 	  we've detected a problematic branch. */
 	  if (succeed && NIA > CIA) {
-	    if (PAGE_SIZE - (CIA & (PAGE_SIZE-1)) <= option_mpc860c0)
+	    if (MPC860C0_PAGE_SIZE - (CIA & (MPC860C0_PAGE_SIZE-1)) <= option_mpc860c0)
 	      program_interrupt(processor, cia, mpc860c0_instruction_program_interrupt);
 	  }
 	}