OS: Adapt task sp alignment to match riscv abi requirement

RT-Thread/ThreadX/FreeRTOS/UCOSII support are updated

see https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc

The stack grows downwards (towards lower addresses) and the stack pointer shall be aligned to a 128-bit boundary upon procedure entry.

The ILP32E calling convention is designed to be usable with the RV32E ISA. This calling convention is the same as the integer calling convention, except for the following differences. The stack pointer need only be aligned to a 32-bit boundary.

Author: fanghuaqi

OS/FreeRTOS/Source/portable/portmacro.h

@@ -84,7 +84,14 @@ typedef uint64_t TickType_t;
 /* Architecture specifics. */
 #define portSTACK_GROWTH            ( -1 )
 #define portTICK_PERIOD_MS          ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
-#define portBYTE_ALIGNMENT          8
+
+#ifndef __riscv_32e
+/* The stack grows downwards (towards lower addresses) and the stack pointer shall be aligned to a 128-bit boundary upon procedure entry. */
+#define portBYTE_ALIGNMENT          16
+#else
+/* ILP32E calling convention The stack pointer need only be aligned to a 32-bit boundary */
+#define portBYTE_ALIGNMENT          4
+#endif
 /*-----------------------------------------------------------*/
 
 /* Scheduler utilities. */

OS/RTThread/libcpu/risc-v/nuclei/cpuport.c

@@ -119,7 +119,13 @@ rt_uint8_t* rt_hw_stack_init(void*       tentry,
     int                i;
 
     stk  = stack_addr + sizeof(rt_ubase_t);
-    stk  = (rt_uint8_t*)RT_ALIGN_DOWN((rt_ubase_t)stk, REGBYTES);
+    /* https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc */
+    /* 32-bit boundary for ilp32e, and 128-bit boundary for others */
+#ifndef __riscv_32e
+    stk  = (rt_uint8_t*)RT_ALIGN_DOWN((rt_ubase_t)stk, 16);
+#else
+    stk  = (rt_uint8_t*)RT_ALIGN_DOWN((rt_ubase_t)stk, 4);
+#endif
     stk -= sizeof(struct rt_hw_stack_frame);
 
     frame = (struct rt_hw_stack_frame*)stk;

OS/ThreadX/ports/nuclei/module_manager/src/txm_module_manager_thread_stack_build.c

@@ -34,7 +34,13 @@ VOID _txm_module_manager_thread_stack_build(TX_THREAD *thread_ptr, VOID (*functi
     stk  = thread_ptr -> tx_thread_stack_end;
     // thread_ptr -> tx_thread_stack_ptr stored thread_entry_info
     thread_entry_info = (TXM_MODULE_THREAD_ENTRY_INFO *)(thread_ptr -> tx_thread_stack_ptr);
-    stk  = (uint8_t *)(((unsigned long)stk) & (~(unsigned long)(sizeof(ALIGN_TYPE) - 1)));
+    /* https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc */
+    /* 32-bit boundary for ilp32e, and 128-bit boundary for others */
+#ifndef __riscv_32e
+    stk  = (uint8_t *)(((unsigned long)stk) & (~(unsigned long)(16 - 1)));
+#else
+    stk  = (uint8_t *)(((unsigned long)stk) & (~(unsigned long)(4 - 1)));
+#endif
     stk -= sizeof(struct thread_stack_frame);
 
     frame = (struct thread_stack_frame*)stk;

OS/ThreadX/ports/nuclei/port.c

@@ -169,7 +169,13 @@ VOID _tx_thread_stack_build(TX_THREAD *thread_ptr, VOID (*function_ptr)(VOID))
     int i;
 
     stk  = thread_ptr -> tx_thread_stack_end;
-    stk  = (uint8_t *)(((unsigned long)stk) & (~(unsigned long)(sizeof(ALIGN_TYPE) - 1)));
+    /* https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-cc.adoc */
+    /* 32-bit boundary for ilp32e, and 128-bit boundary for others */
+#ifndef __riscv_32e
+    stk  = (uint8_t *)(((unsigned long)stk) & (~(unsigned long)(16 - 1)));
+#else
+    stk  = (uint8_t *)(((unsigned long)stk) & (~(unsigned long)(4 - 1)));
+#endif
     stk -= sizeof(struct thread_stack_frame);
 
     frame = (struct thread_stack_frame*)stk;

OS/UCOSII/arch/os_cpu_port.h

@@ -38,7 +38,13 @@ typedef uint64_t TickType_t;
 
 /* Architecture specifics. */
 #define portTICK_PERIOD_MS          ( ( TickType_t ) 1000 / configTICK_RATE_HZ )
-#define portBYTE_ALIGNMENT          8
+#ifndef __riscv_32e
+/* The stack grows downwards (towards lower addresses) and the stack pointer shall be aligned to a 128-bit boundary upon procedure entry. */
+#define portBYTE_ALIGNMENT          16
+#else
+/* ILP32E calling convention The stack pointer need only be aligned to a 32-bit boundary */
+#define portBYTE_ALIGNMENT          4
+#endif
 /*-----------------------------------------------------------*/
 
 /* Scheduler utilities. */