From f529a3b0f8ee24229997e995021a2ee8cb25f065 Mon Sep 17 00:00:00 2001
From: Clyne Sullivan <clyne@bitgloo.com>
Date: Sat, 5 Oct 2024 12:13:49 -0400
Subject: initial commit
---
.gitignore | 3 +++
build.zig | 23 +++++++++++++++++++++++
link.ld | 44 ++++++++++++++++++++++++++++++++++++++++++++
src/bootstrap.s | 38 ++++++++++++++++++++++++++++++++++++++
src/main.zig | 13 +++++++++++++
5 files changed, 121 insertions(+)
create mode 100644 .gitignore
create mode 100644 build.zig
create mode 100644 link.ld
create mode 100644 src/bootstrap.s
create mode 100644 src/main.zig
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..6e988fa
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+*.sw*
+.zig-cache/
+zig-out/
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..10fe592
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,23 @@
+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+ const target = b.resolveTargetQuery(.{
+ .cpu_arch = .thumb,
+ .os_tag = .freestanding,
+ .abi = .none
+ });
+ const optimize = .Debug; // .ReleaseSmall
+
+ const exe = b.addExecutable(.{
+ .name = "stm32",
+ .root_source_file = b.path("src/main.zig"),
+ .target = target,
+ .optimize = optimize,
+ .linkage = .static,
+ });
+
+ exe.addAssemblyFile(b.path("src/bootstrap.s"));
+ exe.setLinkerScriptPath(b.path("link.ld"));
+
+ b.installArtifact(exe);
+}
diff --git a/link.ld b/link.ld
new file mode 100644
index 0000000..403ba71
--- /dev/null
+++ b/link.ld
@@ -0,0 +1,44 @@
+ENTRY(_start)
+
+/* description of memory regions */
+MEMORY {
+ FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 1024K
+ RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 96K
+}
+
+/* description of ELF sections */
+SECTIONS {
+ .text : {
+ . = ALIGN(8);
+ *(.isr_vector)
+ *(.text)
+ *(.text*)
+ } > FLASH
+
+ /* read-only data sections */
+ .rodata : {
+ . = ALIGN(8);
+ *(.rodata)
+ *(.rodata*)
+ } > FLASH
+
+ /* initialized data */
+ _sidata = LOADADDR(.data);
+ .data : {
+ . = ALIGN(8);
+ _sdata = .;
+ *(.data)
+ . = ALIGN(8);
+ _edata = .;
+ } > RAM AT > FLASH
+
+ /* uninitialized data */
+ .bss : {
+ . = ALIGN(8);
+ _sbss = .;
+ *(.bss)
+ . = ALIGN(8);
+ _ebss = .;
+ } > RAM
+}
+
diff --git a/src/bootstrap.s b/src/bootstrap.s
new file mode 100644
index 0000000..22f66f0
--- /dev/null
+++ b/src/bootstrap.s
@@ -0,0 +1,38 @@
+.cpu cortex-m4
+.thumb
+
+.extern _start
+.extern fault_handler
+
+.section .text
+
+fault1:
+ mov r0, 1
+ b fault_handler
+fault2:
+ mov r0, 2
+ b fault_handler
+fault3:
+ mov r0, 3
+ b fault_handler
+fault4:
+ mov r0, 4
+ b fault_handler
+fault5:
+ mov r0, 5
+ b fault_handler
+
+.section .bss
+.skip 128
+stack_top:
+
+.section .isr_vector
+ .word stack_top
+ .word _start
+ .word fault1
+ .word fault2
+ .word fault3
+ .word fault4
+ .word fault5
+ .skip 4 * 91
+
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..de602dd
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,13 @@
+//! By convention, main.zig is where your main function lives in the case that
+//! you are building an executable. If you are making a library, the convention
+//! is to delete this file and start with root.zig instead.
+//const std = @import("std");
+
+export fn _start() callconv(.C) noreturn {
+ while (true) {}
+}
+
+export fn fault_handler() callconv(.C) void {
+ while (true) {}
+}
+
--
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