AArch64: support public linker scripts

bsp/qemu-virt64-aarch64/.config

@@ -94,6 +94,10 @@ CONFIG_RT_CONSOLEBUF_SIZE=256
 CONFIG_RT_CONSOLE_DEVICE_NAME="uart0"
 CONFIG_RT_VER_NUM=0x50001
 CONFIG_RT_USING_STDC_ATOMIC=y
+
+#
+# RT-Thread Architecture
+#
 CONFIG_ARCH_CPU_64BIT=y
 CONFIG_RT_USING_CACHE=y
 # CONFIG_RT_USING_HW_ATOMIC is not set
@@ -104,6 +108,10 @@ CONFIG_ARCH_MM_MMU=y
 CONFIG_ARCH_ARM=y
 CONFIG_ARCH_ARM_MMU=y
 CONFIG_ARCH_ARMV8=y
+CONFIG_ARCH_TEXT_OFFSET=0x80000
+CONFIG_ARCH_RAM_OFFSET=0x40000000
+CONFIG_ARCH_SECONDARY_CPU_STACK_SIZE=4096
+CONFIG_ARCH_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
 
 #
 # RT-Thread Components

bsp/qemu-virt64-aarch64/SConstruct

@@ -40,9 +40,5 @@ Export('rtconfig')
 # prepare building environment
 objs = PrepareBuilding(env, RTT_ROOT)
 
-if GetDepend('RT_USING_SMART'):
-    # use smart link.lds
-    env['LINKFLAGS'] = env['LINKFLAGS'].replace('link.lds', 'link_smart.lds')
-
 # make a building
 DoBuilding(TARGET, objs)

bsp/qemu-virt64-aarch64/rtconfig.h

@@ -61,12 +61,19 @@
 #define RT_CONSOLE_DEVICE_NAME "uart0"
 #define RT_VER_NUM 0x50001
 #define RT_USING_STDC_ATOMIC
+
+/* RT-Thread Architecture */
+
 #define ARCH_CPU_64BIT
 #define RT_USING_CACHE
 #define ARCH_MM_MMU
 #define ARCH_ARM
 #define ARCH_ARM_MMU
 #define ARCH_ARMV8
+#define ARCH_TEXT_OFFSET 0x80000
+#define ARCH_RAM_OFFSET 0x40000000
+#define ARCH_SECONDARY_CPU_STACK_SIZE 4096
+#define ARCH_HAVE_EFFICIENT_UNALIGNED_ACCESS
 
 /* RT-Thread Components */
 

bsp/qemu-virt64-aarch64/rtconfig.py

@@ -13,6 +13,7 @@
     PREFIX  = os.getenv('RTT_CC_PREFIX') or 'aarch64-none-elf-'
     CC      = PREFIX + 'gcc'
     CXX     = PREFIX + 'g++'
+    CPP     = PREFIX + 'cpp'
     AS      = PREFIX + 'gcc'
     AR      = PREFIX + 'ar'
     LINK    = PREFIX + 'gcc'
@@ -25,10 +26,11 @@
     AFPFLAGS = ' '
     DEVICE   = ' -march=armv8-a -mtune=cortex-a53 -ftree-vectorize -ffast-math -funwind-tables -fno-strict-aliasing'
 
+    CPPFLAGS= ' -E -P -x assembler-with-cpp'
     CXXFLAGS= DEVICE + CFPFLAGS + ' -Wall -fdiagnostics-color=always'
     CFLAGS  = DEVICE + CFPFLAGS + ' -Wall -Wno-cpp -std=gnu99 -fdiagnostics-color=always'
     AFLAGS  = ' -c' + AFPFLAGS + ' -x assembler-with-cpp'
-    LFLAGS  = DEVICE + ' -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors -T link.lds' + ' -lsupc++ -lgcc -static'
+    LFLAGS  = DEVICE + ' -nostartfiles -Wl,--gc-sections,-Map=rtthread.map,-cref,-u,system_vectors -T link.lds' + ' -lsupc++ -lgcc -static'
     CPATH   = ''
     LPATH   = ''
 

libcpu/Kconfig

@@ -1,3 +1,5 @@
+menu "RT-Thread Architecture"
+
 config ARCH_CPU_64BIT
     bool
 
@@ -231,3 +233,7 @@ config ARCH_HOST_SIMULATOR
 config ARCH_CPU_STACK_GROWS_UPWARD
     bool
     default n
+
+source "$RTT_DIR/libcpu/aarch64/Kconfig"
+
+endmenu

libcpu/aarch64/.gitignore

@@ -0,0 +1 @@
+link.lds

libcpu/aarch64/Kconfig

@@ -0,0 +1,19 @@
+if ARCH_ARMV8 && ARCH_CPU_64BIT
+
+config ARCH_TEXT_OFFSET
+    hex "Text offset"
+    default 0x200000
+
+config ARCH_RAM_OFFSET
+    hex "RAM offset"
+    default 0
+
+config ARCH_SECONDARY_CPU_STACK_SIZE
+    int "Secondary CPU stack size"
+    default 4096
+
+config ARCH_HAVE_EFFICIENT_UNALIGNED_ACCESS
+    bool
+    default y
+
+endif

libcpu/aarch64/SConscript

@@ -8,6 +8,11 @@ Import('rtconfig')
 cwd   = GetCurrentDir()
 group = []
 list  = os.listdir(cwd)
+bsp_path = Dir('#').abspath
+
+if not os.path.exists(bsp_path + "/link.lds"):
+    Env['LINKFLAGS'] = Env['LINKFLAGS'].replace('link.lds', cwd + "/link.lds")
+    Preprocessing("link.lds.S", ".lds", CPPPATH=[bsp_path])
 
 # add common code files
 group = group + SConscript(os.path.join('common', 'SConscript'))

libcpu/aarch64/common/mmu.c

@@ -777,8 +777,8 @@ void rt_hw_mem_setup_early(unsigned long *tbl0, unsigned long *tbl1,
 #ifdef RT_USING_SMART
     unsigned long va = KERNEL_VADDR_START;
 #else
-    extern unsigned char __start;
-    unsigned long va = (unsigned long) &__start;
+    extern unsigned char _start;
+    unsigned long va = (unsigned long) &_start;
     va = RT_ALIGN_DOWN(va, 0x200000);
 #endif