From 7c98a65ae4fcebf9ebc918fe3e7af9d062805d36 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alex=20R=C3=B8nne=20Petersen?= <alex@alexrp.com>
Date: Wed, 24 Jul 2024 22:18:29 +0200
Subject: [PATCH] start: Add POSIX hexagon support.

---
 lib/std/start.zig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/lib/std/start.zig b/lib/std/start.zig
index 326857d9c0..d97381ef0d 100644
--- a/lib/std/start.zig
+++ b/lib/std/start.zig
@@ -307,6 +307,15 @@ fn _start() callconv(.Naked) noreturn {
             \\ and sp, #-16
             \\ b %[posixCallMainAndExit]
             ,
+            .hexagon =>
+            // r29 = SP, r30 = FP
+            \\ r30 = #0
+            \\ r0 = r29
+            \\ r29 = and(r29, #-16)
+            \\ memw(r29 + #-8) = r29
+            \\ r29 = add(r29, #-8)
+            \\ call %[posixCallMainAndExit]
+            ,
             .loongarch32, .loongarch64 =>
             \\ move $fp, $zero
             \\ move $a0, $sp