ports: add ARMv7-A SMP Linux build scripts(A5,A7,A9)

ports_smp/cortex_a5_smp/gnu/example_build/build_threadx_sample.sh

@@ -0,0 +1,56 @@
+#!/bin/sh
+##############################################################################
+# Copyright (c) 2026 Eclipse ThreadX contributors
+#
+# This program and the accompanying materials are made available under the
+# terms of the MIT License which is available at
+# https://opensource.org/licenses/MIT.
+#
+# SPDX-License-Identifier: MIT
+##############################################################################
+
+set -e
+cd "$(dirname "$0")"
+
+# this script builds the ThreadX sample image for the Cortex-A5 SMP port using
+# GNU toolchain or llvm/clang toolchain (defaults to GNU).
+: "${TOOLCHAIN:=gnu}"
+case "${TOOLCHAIN}" in
+    gnu)
+        CC="arm-none-eabi-gcc"
+        TARGET_FLAGS=""
+        # GNU and Clang use different driver syntax for selecting the program's
+        # entry-point symbol.
+        ENTRY_FLAG="-e Vectors"
+        # Bare-metal C libraries require syscall support. GNU uses newlib's nosys stubs
+        # while ATFE requires a semihost library.
+        SYSCALL_LIB="--specs=nosys.specs"
+        ;;
+    atfe)
+        CC="${ATFE_CLANG:-clang}"
+        TARGET_FLAGS="--target=arm-none-eabi"
+        ENTRY_FLAG="-Wl,--entry=Vectors"
+        SYSCALL_LIB="-lsemihost"
+        ;;
+    *)
+        echo "Unknown TOOLCHAIN: ${TOOLCHAIN}" >&2
+        exit 1
+        ;;
+esac
+
+"${CC}" ${TARGET_FLAGS} -c -g -I../../../../common_smp/inc -I../inc -mcpu=cortex-a5 sample_threadx.c
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 startup.S
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 crt0.S
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 MP_GIC.S
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 MP_SCU.S
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 MP_Mutexes.S
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 MP_PrivateTimer.S
+"${CC}" ${TARGET_FLAGS} -c -g -mcpu=cortex-a5 v7.S
+"${CC}" ${TARGET_FLAGS} -g -mcpu=cortex-a5 -nostartfiles \
+    -T sample_threadx.ld \
+    ${ENTRY_FLAG} \
+    ${SYSCALL_LIB} \
+    -o sample_threadx.out \
+    MP_PrivateTimer.o MP_GIC.o MP_Mutexes.o MP_SCU.o \
+    sample_threadx.o startup.o crt0.o v7.o tx.a \
+    -Wl,-M > sample_threadx.map

ports_smp/cortex_a5_smp/gnu/example_build/crt0.S

@@ -0,0 +1,101 @@
+
+    .syntax unified
+#if defined(THUMB_MODE)
+    .thumb
+#else
+    .arm
+#endif
+
+/* .text is used instead of .section .text so it works with arm-aout too.  */
+    .text
+    .align  0
+
+#if defined(THUMB_MODE)
+    .thumb_func
+#endif
+    .global _mainCRTStartup
+_mainCRTStartup:
+#if defined(THUMB_MODE)
+    .thumb_func
+#endif
+    .global _start
+_start:
+#if defined(THUMB_MODE)
+    .thumb_func
+#endif
+    .global start
+start:
+
+/* Start by setting up a stack */
+    /*  Set up the stack pointer to a fixed value */
+    ldr r3, .LC0
+    mov     sp, r3
+    /* Setup a default stack-limit in case the code has been
+       compiled with "-mapcs-stack-check".  Hard-wiring this value
+       is not ideal, since there is currently no support for
+       checking that the heap and stack have not collided, or that
+       this default 64k is enough for the program being executed.
+       However, it ensures that this simple crt0 world will not
+       immediately cause an overflow event:  */
+    sub sl, sp, #64 << 10   /* Still assumes 256bytes below sl */
+    mov     a2, #0          /* Second arg: fill value */
+    mov fp, a2          /* Null frame pointer */
+    mov r7, a2          /* Null frame pointer for Thumb */
+
+    ldr a1, .LC1        /* First arg: start of memory block */
+    ldr a3, .LC2
+    sub a3, a3, a1      /* Third arg: length of block */
+
+
+
+        bl      memset
+    mov r0, #0      /*  no arguments  */
+    mov r1, #0      /*  no argv either */
+#ifdef __USES_INITFINI__
+    /* Some arm/elf targets use the .init and .fini sections
+       to create constructors and destructors, and for these
+       targets we need to call the _init function and arrange
+       for _fini to be called at program exit.  */
+    mov r4, r0
+    mov r5, r1
+/*        ldr     r0, .Lfini */
+        bl      atexit
+/*        bl      init */
+    mov r0, r4
+    mov r1, r5
+#endif
+        bl      main
+
+        bl      exit         /* Should not return.  */
+
+
+    /* For Thumb, constants must be after the code since only
+       positive offsets are supported for PC relative addresses.  */
+
+    .align 0
+.LC0:
+.LC1:
+    .word   __bss_start__
+.LC2:
+    .word   __bss_end__
+/*
+#ifdef __USES_INITFINI__
+.Lfini:
+    .word   _fini
+#endif  */
+    /* Return ...  */
+    bx  lr
+
+    .global  _fini
+    .type    _fini,function
+_fini:
+    BX      lr                                  // Return to caller
+
+/*  Workspace for Angel calls.  */
+    .data
+/*  Data returned by monitor SWI.  */
+.global __stack_base__
+HeapBase:   .word   0
+HeapLimit:  .word   0
+__stack_base__: .word   0
+StackLimit: .word   0