Add a new misc test suite with addpcis tests

The two tests obtain NIA with bl+mflr+addi and then compare it
against addpcis with the minimum and maximum immediate operand values.

They were also tested on a real POWER9 system (in userspace) for good
measure.

Signed-off-by: Shawn Anastasio <shawn@anastas.io>

tests/misc/Makefile

@@ -0,0 +1,3 @@
+TEST=misc
+
+include ../Makefile.test

tests/misc/head.S

@@ -0,0 +1,102 @@
+/* Copyright 2013-2014 IBM Corp.
+ * Copyrignt 2020 Shawn Anastasio
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * 	http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+ * implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define STACK_TOP 0x2000
+
+/* Load an immediate 64-bit value into a register */
+#define LOAD_IMM64(r, e)			\
+	lis     r,(e)@highest;			\
+	ori     r,r,(e)@higher;			\
+	rldicr  r,r, 32, 31;			\
+	oris    r,r, (e)@h;			\
+	ori     r,r, (e)@l;
+
+	.section ".head","ax"
+
+	/*
+	 * Microwatt currently enters in LE mode at 0x0, so we don't need to
+	 * do any endian fix ups
+	 */
+	. = 0
+.global _start
+_start:
+	b	boot_entry
+
+.global boot_entry
+boot_entry:
+	/* setup stack */
+	LOAD_IMM64(%r1, STACK_TOP - 0x100)
+	LOAD_IMM64(%r12, main)
+	mtctr	%r12
+	bctrl
+	attn // terminate on exit
+	b .
+
+
+/* Test addpcis with an immediate operand of 0 (min) */
+.global test_addpcis_1
+test_addpcis_1:
+    mflr %r0
+    std %r0, 16(%r1)
+    stdu %r1, -32(%r1)
+
+    /* get address of 1 */
+    bl 1f
+    1: mflr %r4
+    addpcis %r5, 0
+
+    /*
+     * At this point, r5 should equal r4 + 2*4
+     * return 0 if they're equal.
+     */
+    addi %r4, %r4, 8
+
+    sub %r3, %r4, %r5
+
+    addi %r1, %r1, 32
+    ld %r0, 16(%r1)
+    mtlr %r0
+
+    blr
+
+/* Test addpcis with an immediate operand of 0xFFFF (max) */
+.global test_addpcis_2
+test_addpcis_2:
+    mflr %r0
+    std %r0, 16(%r1)
+    stdu %r1, -32(%r1)
+
+    /* get address of 1 */
+    bl 1f
+    1: mflr %r4
+    addpcis %r5, 0xFFFF
+
+    /*
+     * Add 8 to r4 to bring it in line with addpcis' NIA.
+     * Then add 0xFFFF shifted and compare.
+     */
+    addi %r4, %r4, 8
+    addis %r4, %r4, 0xFFFF
+
+    sub %r3, %r4, %r5
+
+    addi %r1, %r1, 32
+    ld %r0, 16(%r1)
+    mtlr %r0
+
+    blr
+

tests/misc/misc.c

@@ -0,0 +1,44 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "console.h"
+
+#define TEST "Test "
+#define PASS "PASS\n"
+#define FAIL "FAIL\n"
+
+extern long test_addpcis_1(void);
+extern long test_addpcis_2(void);
+
+// i < 100
+void print_test_number(int i)
+{
+	puts(TEST);
+	putchar(48 + i/10);
+	putchar(48 + i%10);
+	putchar(':');
+}
+
+int main(void)
+{
+	int fail = 0;
+
+	potato_uart_init();
+
+	print_test_number(1);
+	if (test_addpcis_1() != 0) {
+		fail = 1;
+		puts(FAIL);
+	} else
+		puts(PASS);
+
+	print_test_number(2);
+	if (test_addpcis_2() != 0) {
+		fail = 1;
+		puts(FAIL);
+	} else
+		puts(PASS);
+
+	return fail;
+}

tests/misc/powerpc.lds

@@ -0,0 +1,13 @@
+SECTIONS
+{
+	_start = .;
+	. = 0;
+	.head : {
+		KEEP(*(.head))
+ 	}
+	. = 0x1000;
+	.text : { *(.text) }
+	. = 0x2000;
+	.data : { *(.data) }
+	.bss : { *(.bss) }
+}

tests/test_misc.console_out

@@ -0,0 +1,2 @@
+Test 01:PASS
+Test 02:PASS

tests/update_console_tests

@@ -3,7 +3,7 @@
 # Script to update console related tests from source
 #
 
-for i in sc illegal decrementer xics privileged mmu ; do
+for i in sc illegal decrementer xics privileged mmu misc ; do
     cd $i
     make
     cd -