tests/tcg/loongarch64: Add hello/memory test in loongarch64 system

- We write a very minimal softmmu harness.
- This is a very simple smoke test with no need to run a full Linux/kernel.
- The Makefile.softmmu-target record the rule to run.

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-43-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

MAINTAINERS

@@ -217,6 +217,7 @@ M: Song Gao <gaosong@loongson.cn>
 M: Xiaojuan Yang <yangxiaojuan@loongson.cn>
 S: Maintained
 F: target/loongarch/
+F: tests/tcg/loongarch64/
 
 M68K TCG CPUs
 M: Laurent Vivier <laurent@vivier.eu>

tests/tcg/loongarch64/Makefile.softmmu-target

@@ -0,0 +1,33 @@
+#
+# Loongarch64 system tests
+#
+
+LOONGARCH64_SYSTEM_SRC=$(SRC_PATH)/tests/tcg/loongarch64/system
+VPATH+=$(LOONGARCH64_SYSTEM_SRC)
+
+# These objects provide the basic boot code and helper functions for all tests
+CRT_OBJS=boot.o
+
+LOONGARCH64_TEST_SRCS=$(wildcard $(LOONGARCH64_SYSTEM_SRC)/*.c)
+LOONGARCH64_TESTS = $(patsubst $(LOONGARCH64_SYSTEM_SRC)/%.c, %, $(LOONGARCH64_TEST_SRCS))
+
+CRT_PATH=$(LOONGARCH64_SYSTEM_SRC)
+LINK_SCRIPT=$(LOONGARCH64_SYSTEM_SRC)/kernel.ld
+LDFLAGS=-Wl,-T$(LINK_SCRIPT)
+TESTS+=$(LOONGARCH64_TESTS) $(MULTIARCH_TESTS)
+CFLAGS+=-nostdlib -g -O1 -march=loongarch64 -mabi=lp64d $(MINILIB_INC)
+LDFLAGS+=-static -nostdlib $(CRT_OBJS) $(MINILIB_OBJS) -lgcc
+
+# building head blobs
+.PRECIOUS: $(CRT_OBJS)
+
+%.o: $(CRT_PATH)/%.S
+	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) -x assembler-with-cpp -c $< -o $@
+
+# Build and link the tests
+%: %.c $(LINK_SCRIPT) $(CRT_OBJS) $(MINILIB_OBJS)
+	$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $< -o $@ $(LDFLAGS)
+
+memory: CFLAGS+=-DCHECK_UNALIGNED=0
+# Running
+QEMU_OPTS+=-serial chardev:output -kernel

tests/tcg/loongarch64/system/boot.S

@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Minimal LoongArch system boot code.
+ *
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ */
+
+#include "regdef.h"
+
+	.global _start
+	.align 16
+_start:
+	la.local t0, stack_end
+	move sp, t0
+	bl main
+
+	.type _start 2
+	.size _start, .-_start
+
+	.global _exit
+	.align 16
+_exit:
+2:      /* QEMU ACPI poweroff */
+	li.w  t0, 0xff
+	li.w  t1, 0x10080010
+	st.w  t0, t1, 0
+	idle  0
+	bl    2b
+
+	.type _exit 2
+	.size _exit, .-_exit
+
+	.global __sys_outc
+__sys_outc:
+	li.d t1, 1000000
+loop:
+	lu12i.w	t2, 0x1fe00
+	ori	t0, t2, 0x1e5
+	ld.bu	t0, t0, 0
+	andi	t0, t0, 0x20
+	ext.w.b	t0, t0
+	bnez	t0, in
+	addi.w	t1, t1, -1
+	bnez	t1, loop
+in:
+	ext.w.b	a0, a0
+	lu12i.w	t0, 0x1fe00
+	ori	t0, t0, 0x1e0
+	st.b	a0, t0, 0
+	jirl	$r0, ra, 0
+
+	.data
+	.align 4
+stack:
+	.space	65536
+stack_end:

tests/tcg/loongarch64/system/kernel.ld

@@ -0,0 +1,30 @@
+ENTRY(_start)
+
+SECTIONS
+{
+    /* Linux kernel legacy start address.  */
+    . = 0x9000000000200000;
+    _text = .;
+    .text : {
+        *(.text)
+    }
+    .rodata : {
+        *(.rodata)
+    }
+    _etext = .;
+
+    . = ALIGN(8192);
+    _data = .;
+    .got : {
+        *(.got)
+    }
+    .data : {
+	*(.sdata)
+        *(.data)
+    }
+    _edata = .;
+    .bss : {
+        *(.bss)
+    }
+    _end = .;
+}

tests/tcg/loongarch64/system/regdef.h

@@ -0,0 +1,86 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2021 Loongson Technology Corporation Limited
+ */
+#ifndef _ASM_REGDEF_H
+#define _ASM_REGDEF_H
+
+#define zero    $r0     /* wired zero */
+#define ra      $r1     /* return address */
+#define tp      $r2
+#define sp      $r3     /* stack pointer */
+#define v0      $r4     /* return value - caller saved */
+#define v1      $r5
+#define a0      $r4     /* argument registers */
+#define a1      $r5
+#define a2      $r6
+#define a3      $r7
+#define a4      $r8
+#define a5      $r9
+#define a6      $r10
+#define a7      $r11
+#define t0      $r12    /* caller saved */
+#define t1      $r13
+#define t2      $r14
+#define t3      $r15
+#define t4      $r16
+#define t5      $r17
+#define t6      $r18
+#define t7      $r19
+#define t8      $r20
+                        /* $r21: Temporarily reserved */
+#define fp      $r22    /* frame pointer */
+#define s0      $r23    /* callee saved */
+#define s1      $r24
+#define s2      $r25
+#define s3      $r26
+#define s4      $r27
+#define s5      $r28
+#define s6      $r29
+#define s7      $r30
+#define s8      $r31
+
+#define gr0     $r0
+#define gr1     $r1
+#define gr2     $r2
+#define gr3     $r3
+#define gr4     $r4
+#define gr5     $r5
+#define gr6     $r6
+#define gr7     $r7
+#define gr8     $r8
+#define gr9     $r9
+#define gr10    $r10
+#define gr11    $r11
+#define gr12    $r12
+#define gr13    $r13
+#define gr14    $r14
+#define gr15    $r15
+#define gr16    $r16
+#define gr17    $r17
+#define gr18    $r18
+#define gr19    $r19
+#define gr20    $r20
+#define gr21    $r21
+#define gr22    $r22
+#define gr23    $r23
+#define gr24    $r24
+#define gr25    $r25
+#define gr26    $r26
+#define gr27    $r27
+#define gr28    $r28
+#define gr29    $r29
+#define gr30    $r30
+#define gr31    $r31
+
+#define STT_NOTYPE  0
+#define STT_OBJECT  1
+#define STT_FUNC    2
+#define STT_SECTION 3
+#define STT_FILE    4
+#define STT_COMMON  5
+#define STT_TLS     6
+
+#define ASM_NL           ;
+
+#endif /* _ASM_REGDEF_H */