Xtensa Assembly Highlighter for VS Code

Syntax highlighting for Xtensa GNU assembly, aimed at ESP32-class Xtensa targets such as ESP32, ESP32-S2 and ESP32-S3.

Preview

Features

• Xtensa a0-a15 registers and sp
• Common Xtensa special registers
• Xtensa integer, branch, load/store, system and floating-point instructions
• Narrow instruction aliases such as ret.n, addi.n, l32i.n, s32i.n
• GNU assembler directives
• Labels and numeric local labels (1:, 1f, 1b)
• Decimal, hexadecimal, binary and octal immediates
• //, #, and /* ... */ comments
• .s and .S file associations

Example

.section .text
.global syContextSwitcher
.type syContextSwitcher, @function
.align 4

syContextSwitcher:
    addi a1, a1, -32
    s32i a0,  a1, 0
    s32i a12, a1, 4
    s32i a13, a1, 8
    s32i a14, a1, 12
    s32i a15, a1, 16

    s32i a1, a2, 0
    mov  a1, a3

    l32i a0,  a1, 0
    l32i a12, a1, 4
    l32i a13, a1, 8
    l32i a14, a1, 12
    l32i a15, a1, 16
    addi a1, a1, 32
    ret

If another extension already claims .s, use Change Language Mode and select Xtensa Assembly.

Nota bene!

Xtensa cores are configurable, so not every instruction is present on every Xtensa implementation. This extension highlights the common Xtensa/ESP32 instruction families but it does not validate whether a particular opcode is implemented by your exact core configuration.

Developed by

• GeoSn0w (Twitter)

For ForenZes Labs