build.zig and memory.x as ld file for tivatm4c123g

tiva/.gitignore

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+.zig-cache/

tiva/build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.resolveTargetQuery(.{
+        .cpu_arch = .thumb,
+        .os_tag = .freestanding,
+        .abi = .eabi,
+        .cpu_model = .{ .explicit = &std.Target.arm.cpu.cortex_m4 },
+    });
+
+    const optimize = b.standardOptimizeOption(.{});
+
+    // Create the module separately
+    const tiva_module = b.createModule(.{
+        .root_source_file = b.path("src/main.zig"),
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const elf = b.addExecutable(.{
+        .name = "tiva-app",
+        .root_module = tiva_module,
+    });
+
+    // Disable red zone for bare metal
+    elf.root_module.red_zone = false;
+
+    // Provide basic built-in functions
+    elf.bundle_compiler_rt = true;
+
+    // Use your custom linker script
+    elf.setLinkerScript(b.path("layout.ld"));
+
+    b.installArtifact(elf);
+}

tiva/layout.ld

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+/*
+* Copyright (c) 2018, Shawn D'silva <shawn@shawndsilva.com>
+* All rights reserved.
+*
+*  This file is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this library.  If not, see <http://www.gnu.org/licenses/>.
+*
+* File:			TM4C123GH6PHM.ld
+* Author:		Shawn D'silva <https://www.shawndsilva.com>.
+* Version:		1.0.0.
+* Description:	linker file for the TM4C Launchpad
+*/
+
+MEMORY
+{
+    FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 256K /* FLASH size 256KB */
+    RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 32K/* RAM size 32KB */
+
+}
+
+SECTIONS
+{
+
+
+    /* 
+     * initial stack pointer pointing to top of stack,starts from higher addresses
+     * i.e ORIGIN(RAM) + LENGTH(RAM)-1 in this case 0x20007FFF to lower addesses i.e
+     * those lesser than 0x20007FFF to 0x2000000,which is the origina address of RAM,
+     * until it comes in contact with .bss or .data in which case a buffer overflow occurs
+    */
+    PROVIDE( _stack_ptr = ORIGIN(RAM) + LENGTH(RAM));
+
+    /* constants  and other code stored in FLASH */
+    .text :
+    {
+        _text = .;               /* beginning of .text segment,also called code memory */
+        KEEP(*(.vector_table)) /* vector table defined in startup.c to be included */
+        *(.text*)                   /* other code */
+        *(.rodata*)                /* constants go here */
+        _etext = .;             /* end of .text segment */
+    } > FLASH
+
+    /* data, initialized variables, to be copied to RAM upon <RESET> by startup.c */
+    .data : 
+    {
+        _data = .;          /* beginning of .data segment */
+        *(.data*)           /* data goes here */
+        _edata = .;         /* end of .data segment */
+    } > RAM AT >FLASH   /* .data segment starts directly after the .text section in FLASH */
+
+    /* uninitialized data which is initialized to 0 upon <RESET> by startup.c */
+    .bss :
+    {
+        _bss = .;       /* beginning of .bss segment */
+        *(.bss*)        /* .bss content goes here */
+        *(COMMON)       
+        _ebss = .;      /* end of .bss segment */
+    } > RAM
+
+
+
+}