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new 28ad852a6c arch/xtensa:add crt0 to initialize environment
28ad852a6c is described below
commit 28ad852a6cfa80dc5f31c67087bc884b2496e506
Author: anjiahao <anjia...@xiaomi.com>
AuthorDate: Tue Apr 15 11:13:56 2025 +0800
arch/xtensa:add crt0 to initialize environment
we use crt0 inside of start hook in pr
https://github.com/apache/nuttx/pull/16154, so xtensa also need add it.
Signed-off-by: anjiahao <anjia...@xiaomi.com>
---
arch/xtensa/src/Makefile | 7 +-
arch/xtensa/src/common/Make.defs | 2 +
arch/xtensa/src/common/crt0.c | 153 +++++++++++++++++++++++++++++++++++++
arch/xtensa/src/lx6/Toolchain.defs | 6 ++
arch/xtensa/src/lx7/Toolchain.defs | 6 ++
5 files changed, 172 insertions(+), 2 deletions(-)
diff --git a/arch/xtensa/src/Makefile b/arch/xtensa/src/Makefile
index 9308080967..44de5307be 100644
--- a/arch/xtensa/src/Makefile
+++ b/arch/xtensa/src/Makefile
@@ -145,11 +145,14 @@ $(AOBJS) $(UAOBJS) $(HEAD_AOBJ): %$(OBJEXT): %.S
$(COBJS) $(UCOBJS) $(HEAD_COBJ): %$(OBJEXT): %.c
$(call COMPILE, $<, $@)
+$(STARTUP_ELF_OBJS): %$(OBJEXT): %.c
+ $(Q) $(CC) $(CELFFLAGS) -c common$(DELIM)crt0.c -o crt0$(OBJEXT)
+
ifeq ($(CONFIG_BUILD_FLAT),y)
-$(BIN): $(OBJS)
+$(BIN): $(STARTUP_ELF_OBJS) $(OBJS)
$(call ARCHIVE, $@, $(OBJS))
else
-$(BIN): $(UOBJS)
+$(BIN): $(STARTUP_ELF_OBJS) $(UOBJS)
$(call ARCHIVE, $@, $(UOBJS))
endif
diff --git a/arch/xtensa/src/common/Make.defs b/arch/xtensa/src/common/Make.defs
index 33c999e0a6..3d5a58bcac 100644
--- a/arch/xtensa/src/common/Make.defs
+++ b/arch/xtensa/src/common/Make.defs
@@ -22,6 +22,8 @@
# The start-up, "head", file. May be either a .S or a .c file.
+STARTUP_ELF_OBJS = crt0$(OBJEXT)
+
HEAD_ASRC = xtensa_vectors.S xtensa_window_vector.S xtensa_windowspill.S
HEAD_ASRC += xtensa_int_handlers.S xtensa_user_handler.S
diff --git a/arch/xtensa/src/common/crt0.c b/arch/xtensa/src/common/crt0.c
new file mode 100644
index 0000000000..5732057776
--- /dev/null
+++ b/arch/xtensa/src/common/crt0.c
@@ -0,0 +1,153 @@
+/****************************************************************************
+ * arch/xtensa/src/common/crt0.c
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership. The
+ * ASF licenses this file to you 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <sys/types.h>
+#include <stdlib.h>
+
+#include <nuttx/addrenv.h>
+#include <nuttx/arch.h>
+
+#include <arch/syscall.h>
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/* Linker defined symbols to .ctors and .dtors */
+
+extern initializer_t _sctors[];
+extern initializer_t _ectors[];
+extern initializer_t _sdtors[];
+extern initializer_t _edtors[];
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+int main(int argc, char *argv[]);
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+#ifdef CONFIG_HAVE_CXXINITIALIZE
+
+/****************************************************************************
+ * Name: exec_ctors
+ *
+ * Description:
+ * Call static constructors
+ *
+ ****************************************************************************/
+
+static void exec_ctors(void)
+{
+ for (initializer_t *ctor = _sctors; ctor != _ectors; ctor++)
+ {
+ (*ctor)();
+ }
+}
+
+/****************************************************************************
+ * Name: exec_dtors
+ *
+ * Description:
+ * Call static destructors
+ *
+ ****************************************************************************/
+
+static void exec_dtors(void)
+{
+ for (initializer_t *dtor = _sdtors; dtor != _edtors; dtor++)
+ {
+ (*dtor)();
+ }
+}
+
+#endif
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: __start
+ *
+ * Description:
+ * This function is the low level entry point into the main thread of
+ * execution of a task. It receives initial control when the task is
+ * started and calls main entry point of the newly started task.
+ *
+ * Input Parameters:
+ * argc - The number of parameters being passed.
+ * argv - The parameters being passed. These lie in kernel-space memory
+ * and will have to be reallocated in user-space memory.
+ *
+ * Returned Value:
+ * This function should not return. It should call the user-mode start-up
+ * main() function. If that function returns, this function will call
+ * exit.
+ *
+ ****************************************************************************/
+
+void __start(int argc, char *argv[])
+{
+ int ret;
+
+ /* Initialize the reserved area at the beginning of the .bss/.data region
+ * that is visible to the RTOS.
+ */
+
+#ifdef CONFIG_BUILD_KERNEL
+ ARCH_DATA_RESERVE->ar_sigtramp = (addrenv_sigtramp_t)sig_trampoline;
+#endif
+
+#ifdef CONFIG_HAVE_CXXINITIALIZE
+ /* Call C++ constructors */
+
+ exec_ctors();
+
+ /* Setup so that C++ destructors called on task exit */
+
+# if CONFIG_LIBC_MAX_EXITFUNS > 0
+ atexit(exec_dtors);
+# endif
+#endif
+
+ /* Call the main() entry point passing argc and argv. */
+
+ ret = main(argc, argv);
+
+#if defined(CONFIG_HAVE_CXXINITIALIZE) && CONFIG_LIBC_MAX_EXITFUNS <= 0
+ exec_dtors();
+#endif
+
+ /* Call exit() if/when the main() returns */
+
+ exit(ret);
+}
diff --git a/arch/xtensa/src/lx6/Toolchain.defs
b/arch/xtensa/src/lx6/Toolchain.defs
index 7caa075e00..5649523ced 100644
--- a/arch/xtensa/src/lx6/Toolchain.defs
+++ b/arch/xtensa/src/lx6/Toolchain.defs
@@ -219,3 +219,9 @@ CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
-mtext-section-literals
LDELFFLAGS = -r -e __start
LDELFFLAGS += -T $(call
CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
+ifneq ($(CONFIG_BUILD_KERNEL),y)
+ # Flat build and protected elf entry point use crt0,
+ # Kernel build will use apps/import/scripts/crt0
+
+ LDELFFLAGS += $(TOPDIR)$(DELIM)arch$(DELIM)xtensa$(DELIM)src$(DELIM)crt0.o
+endif
diff --git a/arch/xtensa/src/lx7/Toolchain.defs
b/arch/xtensa/src/lx7/Toolchain.defs
index 4aa7a68df0..9d45f1d9e0 100644
--- a/arch/xtensa/src/lx7/Toolchain.defs
+++ b/arch/xtensa/src/lx7/Toolchain.defs
@@ -223,3 +223,9 @@ CXXELFFLAGS = $(CXXFLAGS) -fvisibility=hidden
-mtext-section-literals
LDELFFLAGS = -r -e __start
LDELFFLAGS += -T $(call
CONVERT_PATH,$(TOPDIR)$(DELIM)libs$(DELIM)libc$(DELIM)elf$(DELIM)gnu-elf.ld)
+ifneq ($(CONFIG_BUILD_KERNEL),y)
+ # Flat build and protected elf entry point use crt0,
+ # Kernel build will use apps/import/scripts/crt0
+
+ LDELFFLAGS += $(TOPDIR)$(DELIM)arch$(DELIM)xtensa$(DELIM)src$(DELIM)crt0.o
+endif
