std.start: add xtensa support

2026-05-30 21:07:34 +03:00 · 2026-05-26 08:08:53 +02:00
parent 68d2bef8c0
commit 5143239e2b
1 changed files with 10 additions and 0 deletions
@@ -183,6 +183,7 @@ fn _start() callconv(.naked) noreturn {
            .sparc, .sparc64 => ".cfi_undefined %%i7",
            .x86 => ".cfi_undefined %%eip",
            .x86_64 => ".cfi_undefined %%rip",
+            .xtensa, .xtensaeb => "", // No CFI support.
            else => @compileError("unsupported arch"),
        });

@@ -486,6 +487,15 @@ fn _start() callconv(.naked) noreturn {
            \\ sub %%sp, 2047, %%sp
            \\ ba,a %[posixCallMainAndExit]
            ,
+            .xtensa, .xtensaeb =>
+            // a0 = LR, a7 = FP, a1 = SP
+            \\ movi a0, 0
+            \\ movi a7, 0
+            \\ mov a2, sp
+            \\ movi a8, -16
+            \\ and sp, sp, a8
+            \\ callx0 %[posixCallMainAndExit]
+            ,
            else => @compileError("unsupported arch"),
        }
        :