arch/sim: save errno in sim context switch to avoid coroutine make errno mess between host api calls.

arch/sim/include/setjmp.h

@@ -40,7 +40,7 @@
 #if defined(CONFIG_HOST_X86_64) && !defined(CONFIG_SIM_M32)
   /* Storage order: %rbx, %rsp, %rbp, %r12, %r13, %r14, %r15, %rip */
 
-#  define XCPTCONTEXT_REGS    9
+#  define XCPTCONTEXT_REGS    11
 #  define XCPTCONTEXT_SIZE    (8 * XCPTCONTEXT_REGS)
 
 #  ifdef __ASSEMBLY__
@@ -54,6 +54,8 @@
 #    define JB_R15            (6*8)
 #    define JB_RIP            (7*8)
 #    define JB_FLAG           (8*8)
+#    define JB_ERRNO          (9*8)
+#    define JB_ALIGN0         (10*8)
 
 #  else
 
@@ -66,6 +68,8 @@
 #    define JB_R15            (6)
 #    define JB_RIP            (7)
 #    define JB_FLAG           (8)
+#    define JB_ERRNO          (9)
+#    define JB_ALIGN0         (10)
 
 #  endif /* __ASSEMBLY__ */
 
@@ -78,7 +82,7 @@
 #elif defined(CONFIG_HOST_X86) || defined(CONFIG_SIM_M32)
   /* Storage order: %ebx, %esi, %edi, %ebp, sp, and return PC */
 
-#  define XCPTCONTEXT_REGS    (8)
+#  define XCPTCONTEXT_REGS    (9)
 #  define XCPTCONTEXT_SIZE    (4 * XCPTCONTEXT_REGS)
 
 #  ifdef __ASSEMBLY__
@@ -91,6 +95,7 @@
 #    define JB_EIP            (5*4)
 #    define JB_FLAG           (6*4)
 #    define JB_FLAG1          (7*4)
+#    define JB_ERRNO          (8*4)
 
 #  else
 
@@ -102,6 +107,7 @@
 #    define JB_EIP            (5)
 #    define JB_FLAG           (6)
 #    define JB_FLAG1          (7)
+#    define JB_ERRNO          (8)
 
 #  endif /* __ASSEMBLY__ */
 
@@ -113,18 +119,19 @@
 
 #elif defined(CONFIG_HOST_ARM)
 
-#  define XCPTCONTEXT_REGS    18
+#  define XCPTCONTEXT_REGS    19
 #  define XCPTCONTEXT_SIZE    (4 * XCPTCONTEXT_REGS)
 
 #  define JB_FP               7
 #  define JB_SP               8
 #  define JB_PC               9
 #  define JB_FLAG             16
 #  define JB_FLAG1            17
+#  define JB_ERRNO            18
 
 #elif defined(CONFIG_HOST_ARM64)
 
-#  define XCPTCONTEXT_REGS    33
+#  define XCPTCONTEXT_REGS    34
 #  define XCPTCONTEXT_SIZE    (8 * XCPTCONTEXT_REGS)
 
 #  ifdef __ASSEMBLY__
@@ -148,6 +155,7 @@
 #    define JB_FP             (12)
 #    define JB_SP             (13)
 #    define JB_FLAG           (32)
+#    define JB_ERRNO          (33)
 
 #  endif /* __ASSEMBLY__ */
 

arch/sim/src/Makefile

@@ -118,7 +118,7 @@ ifeq ($(CONFIG_FS_LARGEFILE),y)
 endif
 
 HOSTSRCS  = sim_hostirq.c sim_hostmemory.c sim_hostmisc.c sim_hosttime.c sim_hostuart.c
-HOSTSRCS += sim_hostfs.c
+HOSTSRCS += sim_hostfs.c sim_errno.c
 
 hostfs.h: $(TOPDIR)/include/nuttx/fs/hostfs.h
 	@echo "CP:  $<"

arch/sim/src/sim/CMakeLists.txt

@@ -284,6 +284,8 @@ endif()
 list(APPEND HOSTSRCS sim_hostfs.c)
 list(APPEND HOST_DEFINITIONS CONFIG_NAME_MAX=${CONFIG_NAME_MAX})
 
+list(APPEND HOSTSRCS sim_errno.c)
+
 configure_file(${NUTTX_DIR}/include/nuttx/fs/hostfs.h
                ${CMAKE_CURRENT_BINARY_DIR}/hostfs.h COPYONLY)
 configure_file(${CMAKE_BINARY_DIR}/include/nuttx/config.h

arch/sim/src/sim/posix/sim_errno.c

@@ -0,0 +1,46 @@
+/****************************************************************************
+ * arch/sim/src/sim/posix/sim_errno.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 <errno.h>
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int host_errno_convert(int errcode)
+{
+  return errcode;
+}
+
+int host_errno_get(void)
+{
+  return errno;
+}
+
+void host_errno_set(int errcode)
+{
+  errno = errcode;
+}