esp32s3: changes to support espradio by deadprogram · Pull Request #5283 · tinygo-org/tinygo

deadprogram · 2026-04-07T10:24:47Z

This PR contains several commits that are needed to support the espradio package on the ESP32-S3 processor.

allows for changes to the 'short-enums' flag
add flash XIP boot assembly with cache/MMU init. This is needed both for larger programs and also to call ROM functions.
update linker script and boot assembly for multi-page flash XIP mapping
fix Xtensa register window spill using recursive call4 in task switching
improve exception handlers, add procPin/procUnpin, and linker wrap flags for picolib allocations

This allows for changes to the 'short-enums' flag when using CGo since TinyGo already does this, and it is needed for the esp32s3 processor. Signed-off-by: deadprogram <ron@hybridgroup.com>

The ESP32-S3 ROM bootloader loads IRAM/DRAM into SRAM but does not configure the flash cache or MMU. Previously the target incorrectly reused the ESP32 boot assembly (esp32.S) which lacks flash XIP support. Add a dedicated esp32s3.S boot assembly that: - Sets up windowed-ABI registers, stack, and FPU - Disables all watchdog timers (RTC, TIMG0, TIMG1, Super WDT) - Configures VECBASE and clears PS.EXCM before any callx4 - Calls ROM functions to configure cache modes: rom_config_instruction_cache_mode (16KB, 8-way, 32B line) rom_config_data_cache_mode (32KB, 8-way, 32B line) - Initializes MMU, maps flash page 0 for IROM and DROM, clears bus-shut bits, and enables both caches - Jumps to runtime.main in IROM (flash) Update the linker script (esp32s3.ld) to place .text and .rodata in flash-mapped regions (IROM/DROM) with proper alignment for the MMU page size. Update esp32s3-interrupts.S with proper exception vector handlers. Point esp32s3.json at the new esp32s3.S instead of esp32.S. Signed-off-by: deadprogram <ron@hybridgroup.com>

…XIP mapping Extend the linker script with proper IROM/DROM section layout for flash execute-in-place. Update the boot assembly MMU init to dynamically map all required flash pages based on _irom_end/_drom_end symbols instead of hardcoding a single page. Signed-off-by: deadprogram <ron@hybridgroup.com>

…sk switching Replace the ROTW-based register flush with a recursive call4 approach that properly triggers hardware window-overflow exceptions. ROTW only modifies WindowBase without saving registers, causing corruption when switching goroutines. The recursive call4 correctly spills all 15 window panes. Also clear WindowStart after the stack switch to prevent stale overflow of garbage register values. Add tinygo_task_current export for C interop. Signed-off-by: deadprogram <ron@hybridgroup.com>

…r wrap flags Rewrite kernel and double exception handlers to save EXCCAUSE/EPC1 to RTC STORE registers before triggering a software reset, replacing the LED-blink diagnostic with post-mortem debug info that survives reset. Add user exception dispatch in the level-1 handler with a weak espradio_user_exception symbol so programs without espradio still link. Implement procPin/procUnpin for Xtensa using RSIL/WSR PS to properly disable interrupts during atomic operations. Fix abort() to use a waiti loop instead of bare spin. Add --wrap ldflags for malloc/calloc/free/realloc/ppCheckTxConnTrafficIdle to support espradio WiFi blob integration. Signed-off-by: deadprogram <ron@hybridgroup.com>

github-actions · 2026-04-07T10:42:44Z

Size difference with the dev branch:

Binary size difference

not the same command!
    tinygo build -size short -o ./build/test.hex -target=feather-rp2040 ./examples/adafruit4650
    go: downloading tinygo.org/x/tinyfont v0.3.0
not the same command!
    tinygo build -size short -o ./build/test.hex -target=pico ./examples/tmc5160/main.go
    go: downloading golang.org/x/exp v0.0.0-20241204233417-43b7b7cde48d
not the same command!
    tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/websocket/dial/
    go: downloading golang.org/x/net v0.33.0
not the same command!
    tinygo build -size short -o ./build/test.hex -target=nano-rp2040 -stack-size 8kb ./examples/net/mqttclient/natiu/
    go: downloading github.com/soypat/natiu-mqtt v0.5.1
not the same command!
    tinygo build -size short -o ./build/test.hex -target=wioterminal -stack-size 8kb ./examples/net/mqttclient/paho/
    go: downloading github.com/eclipse/paho.mqtt.golang v1.2.0
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soypat · 2026-04-07T12:07:59Z

src/runtime/runtime_esp32s3.go

 	print("abort called\n")
+	// lock up forever
+	for {
+		device.Asm("waiti 0")


curious about this- it loooks like abort was inneffective before- when is abort called and what effect did an empty abort have?

Abort is called after a panic.

deadprogram · 2026-04-07T14:26:57Z

Thank you for the quick review @soypat now merging.

deadprogram added 5 commits April 7, 2026 12:18

cgo: allow for changes to 'short-enums' flag

6ab9064

This allows for changes to the 'short-enums' flag when using CGo since TinyGo already does this, and it is needed for the esp32s3 processor. Signed-off-by: deadprogram <ron@hybridgroup.com>

deadprogram mentioned this pull request Apr 7, 2026

feature: add support for ESP32S3 tinygo-org/espradio#19

Merged

soypat reviewed Apr 7, 2026

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soypat approved these changes Apr 7, 2026

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deadprogram merged commit a24dc8c into dev Apr 7, 2026
26 checks passed

deadprogram deleted the esp32s3-irq-xip branch April 7, 2026 14:27

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esp32s3: changes to support espradio#5283

esp32s3: changes to support espradio#5283
deadprogram merged 5 commits intodevfrom
esp32s3-irq-xip

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