From 373c554708f24f7e84e5bd5b2b3463d49d6fcd9e Mon Sep 17 00:00:00 2001
From: Suguru Saito <sg.sgch07@gmail.com>
Date: Wed, 15 Dec 2021 01:27:08 +0900
Subject: [PATCH] x1 experimental libbrain

---
 x1/linkerscript/Makefile                |  6 ++-
 x1/linkerscript/libbrain/Makefile       | 23 +++++++++++
 x1/linkerscript/libbrain/libbrain.h     | 54 +++++++++++++++++++++++++
 x1/linkerscript/libbrain/sys_closedir.s |  8 ++++
 x1/linkerscript/libbrain/sys_fclose.s   |  8 ++++
 x1/linkerscript/libbrain/sys_feof.s     |  8 ++++
 x1/linkerscript/libbrain/sys_ferror.s   |  8 ++++
 x1/linkerscript/libbrain/sys_fflush.s   |  8 ++++
 x1/linkerscript/libbrain/sys_fgetc.s    |  8 ++++
 x1/linkerscript/libbrain/sys_fgets.s    |  8 ++++
 x1/linkerscript/libbrain/sys_fopen.s    |  8 ++++
 x1/linkerscript/libbrain/sys_fputc.s    |  8 ++++
 x1/linkerscript/libbrain/sys_fputs.s    |  8 ++++
 x1/linkerscript/libbrain/sys_fread.s    |  8 ++++
 x1/linkerscript/libbrain/sys_free.s     |  8 ++++
 x1/linkerscript/libbrain/sys_ftell.s    |  8 ++++
 x1/linkerscript/libbrain/sys_fwrite.s   |  8 ++++
 x1/linkerscript/libbrain/sys_malloc.s   |  8 ++++
 x1/linkerscript/libbrain/sys_mkdir.s    |  8 ++++
 x1/linkerscript/libbrain/sys_opendir.s  |  8 ++++
 x1/linkerscript/libbrain/sys_printf.s   |  8 ++++
 x1/linkerscript/libbrain/sys_readdir.s  |  8 ++++
 x1/linkerscript/libbrain/sys_remove.s   |  8 ++++
 x1/linkerscript/libbrain/sys_rename.s   |  8 ++++
 x1/linkerscript/libbrain/sys_stat.s     |  8 ++++
 x1/linkerscript/main.c                  |  3 ++
 26 files changed, 260 insertions(+), 2 deletions(-)
 create mode 100644 x1/linkerscript/libbrain/Makefile
 create mode 100644 x1/linkerscript/libbrain/libbrain.h
 create mode 100644 x1/linkerscript/libbrain/sys_closedir.s
 create mode 100644 x1/linkerscript/libbrain/sys_fclose.s
 create mode 100644 x1/linkerscript/libbrain/sys_feof.s
 create mode 100644 x1/linkerscript/libbrain/sys_ferror.s
 create mode 100644 x1/linkerscript/libbrain/sys_fflush.s
 create mode 100644 x1/linkerscript/libbrain/sys_fgetc.s
 create mode 100644 x1/linkerscript/libbrain/sys_fgets.s
 create mode 100644 x1/linkerscript/libbrain/sys_fopen.s
 create mode 100644 x1/linkerscript/libbrain/sys_fputc.s
 create mode 100644 x1/linkerscript/libbrain/sys_fputs.s
 create mode 100644 x1/linkerscript/libbrain/sys_fread.s
 create mode 100644 x1/linkerscript/libbrain/sys_free.s
 create mode 100644 x1/linkerscript/libbrain/sys_ftell.s
 create mode 100644 x1/linkerscript/libbrain/sys_fwrite.s
 create mode 100644 x1/linkerscript/libbrain/sys_malloc.s
 create mode 100644 x1/linkerscript/libbrain/sys_mkdir.s
 create mode 100644 x1/linkerscript/libbrain/sys_opendir.s
 create mode 100644 x1/linkerscript/libbrain/sys_printf.s
 create mode 100644 x1/linkerscript/libbrain/sys_readdir.s
 create mode 100644 x1/linkerscript/libbrain/sys_remove.s
 create mode 100644 x1/linkerscript/libbrain/sys_rename.s
 create mode 100644 x1/linkerscript/libbrain/sys_stat.s

diff --git a/x1/linkerscript/Makefile b/x1/linkerscript/Makefile
index a107a2c..881d8ed 100644
--- a/x1/linkerscript/Makefile
+++ b/x1/linkerscript/Makefile
@@ -7,8 +7,10 @@ OBJCOPY := $(CROSS_COMPILE)objcopy
 TARGET := AppMain
 OBJS := crt0.o main.o
 
+LIBS := libbrain/libbrain.a
+
 ASFLAGS := -W
-CFLAGS := -Wall -ffreestanding -fomit-frame-pointer -Os
+CFLAGS := -Wall -ffreestanding -fomit-frame-pointer -Os -Ilibbrain
 LDFLAGS := -T x1.ld
 
 .PHONY:
@@ -25,7 +27,7 @@ clean:
 	$(CC) -c $(CFLAGS) $<
 
 $(TARGET).elf: $(OBJS)
-	$(LD) $(LDFLAGS) $^ -o $@
+	$(LD) $(LDFLAGS) $^ $(LIBS) -o $@
 
 $(TARGET).bin: $(TARGET).elf
 	$(OBJCOPY) -O binary $< $@
diff --git a/x1/linkerscript/libbrain/Makefile b/x1/linkerscript/libbrain/Makefile
new file mode 100644
index 0000000..88aa957
--- /dev/null
+++ b/x1/linkerscript/libbrain/Makefile
@@ -0,0 +1,23 @@
+CROSS_COMPILE := arm-linux-gnueabihf-
+AS := $(CROSS_COMPILE)as
+AR := $(CROSS_COMPILE)ar
+
+TARGET := libbrain.a
+OBJS := sys_closedir.o sys_feof.o sys_fflush.o sys_fgets.o sys_fputc.o sys_fread.o sys_ftell.o sys_malloc.o sys_opendir.o sys_readdir.o sys_rename.o sys_fclose.o sys_ferror.o sys_fgetc.o sys_fopen.o sys_fputs.o sys_free.o sys_fwrite.o sys_mkdir.o sys_printf.o sys_remove.o sys_stat.o
+
+ASFLAGS := -W
+ARFLAGS := -crs
+
+.PHONY:
+all: $(TARGET)
+
+.PHONY:
+clean:
+	-rm -f $(TARGET) *.o
+
+%.o: %.s
+	$(AS) $(ASFLAGS) $< -o $@
+
+$(TARGET): $(OBJS)
+	$(AR) $(ARFLAGS) $@ $^
+
diff --git a/x1/linkerscript/libbrain/libbrain.h b/x1/linkerscript/libbrain/libbrain.h
new file mode 100644
index 0000000..2850b02
--- /dev/null
+++ b/x1/linkerscript/libbrain/libbrain.h
@@ -0,0 +1,54 @@
+#ifndef H_LIB_BRAIN_H
+#define H_LIB_BRAIN_H
+
+typedef unsigned long size_t;
+typedef void FILE;
+typedef void* DIR;
+
+struct stat {
+    unsigned int flags;
+    unsigned int st_atim;
+    unsigned int st_mtim;
+    unsigned int st_ctim;
+    size_t st_size;
+};
+
+struct dirent {
+    unsigned int type;
+    size_t size;
+    size_t filename_length;
+    char filename[260];
+};
+
+enum {
+    SEEK_SET = 0,
+    SEEK_CUR,
+    SEEK_END,
+};
+
+void *sys_malloc(size_t size);
+int sys_free(void *ptr);
+FILE *sys_fopen(const char *filename, const char *mode);
+int sys_fclose(FILE *stream);
+int sys_ftell(FILE *stream);
+size_t sys_fread(void *ptr, size_t size, size_t nmemb, FILE *stream);
+size_t sys_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream);
+int sys_fseek(FILE *stream, int offset, int whence);
+int sys_feof(FILE *stream);
+int sys_fflush(FILE *stream);
+int sys_fgetc(FILE *stream);
+char *sys_fgets(char *s, int n, FILE *stream);
+int sys_fputc(int ch, FILE *stream);
+int sys_fputs(const char *str, FILE *stream);
+int sys_ferror(FILE *stream);
+int sys_remove(const char *filepath);
+int sys_rename(const char *oldpath, const char *newpath);
+int sys_mkdir(const char *pathname);
+int sys_stat(const char *filepath, struct stat *buf);
+int sys_closedir(DIR *dirp);
+struct dirent *sys_readdir(DIR *dirp);
+DIR *sys_opendir(const char *pathname);
+
+int sys_printf(const char *fmt);
+
+#endif
diff --git a/x1/linkerscript/libbrain/sys_closedir.s b/x1/linkerscript/libbrain/sys_closedir.s
new file mode 100644
index 0000000..03ce466
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_closedir.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_closedir
+.type sys_closedir, %function
+sys_closedir:
+    ldr     pc, [pc, #-4]
+    .word 0x6000644c
diff --git a/x1/linkerscript/libbrain/sys_fclose.s b/x1/linkerscript/libbrain/sys_fclose.s
new file mode 100644
index 0000000..cbdb202
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fclose.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fclose
+.type sys_fclose, %function
+sys_fclose:
+    ldr     pc, [pc, #-4]
+    .word 0x60006404
diff --git a/x1/linkerscript/libbrain/sys_feof.s b/x1/linkerscript/libbrain/sys_feof.s
new file mode 100644
index 0000000..ca94ebf
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_feof.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_feof
+.type sys_feof, %function
+sys_feof:
+    ldr     pc, [pc, #-4]
+    .word 0x60006418
diff --git a/x1/linkerscript/libbrain/sys_ferror.s b/x1/linkerscript/libbrain/sys_ferror.s
new file mode 100644
index 0000000..37347dd
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_ferror.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_ferror
+.type sys_ferror, %function
+sys_ferror:
+    ldr     pc, [pc, #-4]
+    .word 0x60006430
diff --git a/x1/linkerscript/libbrain/sys_fflush.s b/x1/linkerscript/libbrain/sys_fflush.s
new file mode 100644
index 0000000..b126b64
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fflush.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fflush
+.type sys_fflush, %function
+sys_fflush:
+    ldr     pc, [pc, #-4]
+    .word 0x6000641c
diff --git a/x1/linkerscript/libbrain/sys_fgetc.s b/x1/linkerscript/libbrain/sys_fgetc.s
new file mode 100644
index 0000000..6c17648
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fgetc.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fgetc
+.type sys_fgetc, %function
+sys_fgetc:
+    ldr     pc, [pc, #-4]
+    .word 0x60006420
diff --git a/x1/linkerscript/libbrain/sys_fgets.s b/x1/linkerscript/libbrain/sys_fgets.s
new file mode 100644
index 0000000..a56ee21
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fgets.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fgets
+.type sys_fgets, %function
+sys_fgets:
+    ldr     pc, [pc, #-4]
+    .word 0x60006424
diff --git a/x1/linkerscript/libbrain/sys_fopen.s b/x1/linkerscript/libbrain/sys_fopen.s
new file mode 100644
index 0000000..0c24a42
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fopen.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fopen
+.type sys_fopen, %function
+sys_fopen:
+    ldr     pc, [pc, #-4]
+    .word 0x60006400
diff --git a/x1/linkerscript/libbrain/sys_fputc.s b/x1/linkerscript/libbrain/sys_fputc.s
new file mode 100644
index 0000000..12aa856
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fputc.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fputc
+.type sys_fputc, %function
+sys_fputc:
+    ldr     pc, [pc, #-4]
+    .word 0x60006428
diff --git a/x1/linkerscript/libbrain/sys_fputs.s b/x1/linkerscript/libbrain/sys_fputs.s
new file mode 100644
index 0000000..a885027
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fputs.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fputs
+.type sys_fputs, %function
+sys_fputs:
+    ldr     pc, [pc, #-4]
+    .word 0x6000642c
diff --git a/x1/linkerscript/libbrain/sys_fread.s b/x1/linkerscript/libbrain/sys_fread.s
new file mode 100644
index 0000000..e0f2e5b
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fread.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fread
+.type sys_fread, %function
+sys_fread:
+    ldr     pc, [pc, #-4]
+    .word 0x6000640c
diff --git a/x1/linkerscript/libbrain/sys_free.s b/x1/linkerscript/libbrain/sys_free.s
new file mode 100644
index 0000000..ac4a70b
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_free.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_free
+.type sys_free, %function
+sys_free:
+    ldr     pc, [pc, #-4]
+    .word 0x600063c8
diff --git a/x1/linkerscript/libbrain/sys_ftell.s b/x1/linkerscript/libbrain/sys_ftell.s
new file mode 100644
index 0000000..60cba20
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_ftell.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_ftell
+.type sys_ftell, %function
+sys_ftell:
+    ldr     pc, [pc, #-4]
+    .word 0x60006408
diff --git a/x1/linkerscript/libbrain/sys_fwrite.s b/x1/linkerscript/libbrain/sys_fwrite.s
new file mode 100644
index 0000000..7e6ff3a
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_fwrite.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_fwrite
+.type sys_fwrite, %function
+sys_fwrite:
+    ldr     pc, [pc, #-4]
+    .word 0x60006410
diff --git a/x1/linkerscript/libbrain/sys_malloc.s b/x1/linkerscript/libbrain/sys_malloc.s
new file mode 100644
index 0000000..b820c6e
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_malloc.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_malloc
+.type sys_malloc, %function
+sys_malloc:
+    ldr     pc, [pc, #-4]
+    .word 0x600063c4
diff --git a/x1/linkerscript/libbrain/sys_mkdir.s b/x1/linkerscript/libbrain/sys_mkdir.s
new file mode 100644
index 0000000..26728c8
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_mkdir.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_mkdir
+.type sys_mkdir, %function
+sys_mkdir:
+    ldr     pc, [pc, #-4]
+    .word 0x6000643c
diff --git a/x1/linkerscript/libbrain/sys_opendir.s b/x1/linkerscript/libbrain/sys_opendir.s
new file mode 100644
index 0000000..14164d4
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_opendir.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_opendir
+.type sys_opendir, %function
+sys_opendir:
+    ldr     pc, [pc, #-4]
+    .word 0x60006454
diff --git a/x1/linkerscript/libbrain/sys_printf.s b/x1/linkerscript/libbrain/sys_printf.s
new file mode 100644
index 0000000..cd0c07c
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_printf.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_printf
+.type sys_printf, %function
+sys_printf:
+    ldr     pc, [pc, #-4]
+    .word 0x60092004
diff --git a/x1/linkerscript/libbrain/sys_readdir.s b/x1/linkerscript/libbrain/sys_readdir.s
new file mode 100644
index 0000000..cb0eec7
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_readdir.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_readdir
+.type sys_readdir, %function
+sys_readdir:
+    ldr     pc, [pc, #-4]
+    .word 0x60006450
diff --git a/x1/linkerscript/libbrain/sys_remove.s b/x1/linkerscript/libbrain/sys_remove.s
new file mode 100644
index 0000000..1a746ba
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_remove.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_remove
+.type sys_remove, %function
+sys_remove:
+    ldr     pc, [pc, #-4]
+    .word 0x60006434
diff --git a/x1/linkerscript/libbrain/sys_rename.s b/x1/linkerscript/libbrain/sys_rename.s
new file mode 100644
index 0000000..26145be
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_rename.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_rename
+.type sys_rename, %function
+sys_rename:
+    ldr     pc, [pc, #-4]
+    .word 0x60006438
diff --git a/x1/linkerscript/libbrain/sys_stat.s b/x1/linkerscript/libbrain/sys_stat.s
new file mode 100644
index 0000000..4cbf898
--- /dev/null
+++ b/x1/linkerscript/libbrain/sys_stat.s
@@ -0,0 +1,8 @@
+.text
+.align 4
+
+.global sys_stat
+.type sys_stat, %function
+sys_stat:
+    ldr     pc, [pc, #-4]
+    .word 0x60006444
diff --git a/x1/linkerscript/main.c b/x1/linkerscript/main.c
index 9fbdf5d..7ec6fba 100644
--- a/x1/linkerscript/main.c
+++ b/x1/linkerscript/main.c
@@ -1,4 +1,7 @@
+#include <libbrain.h>
+
 int main(void *arg)
 {
+    sys_printf("Hello!\n");
     return 0;
 }