zig

commit a80ff87a04acff1cd5e5c0496a65d2dbed823c0d (tree)
parent 7e51c731b85f15dc6898e57301c51802e43a924a
Author: Alex Rønne Petersen <alex@alexrp.com>
Date:   Fri, 29 May 2026 08:20:27 +0200

std.start: add xtensa call0 support

Diffstat:
M
lib/std/start.zig
 | 
24
++++++++++++++++--------

1 file changed, 16 insertions(+), 8 deletions(-)
diff --git a/lib/std/start.zig b/lib/std/start.zig
@@ -487,14 +487,22 @@ 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 a6, sp
-            \\ movi a8, -16
-            \\ and sp, sp, a8
-            \\ call4 %[posixCallMainAndExit]
+            .xtensa, .xtensaeb => if (builtin.abi == .call0)
+                // a0 = LR, a15 = FP, a1 = SP
+                \\ movi a0, 0
+                \\ movi a15, 0
+                \\ mov a2, sp
+                \\ movi a8, -16
+                \\ and sp, sp, a8
+                \\ call0 %[posixCallMainAndExit]
+            else
+                // a0 = LR, a7 = FP, a1 = SP
+                \\ movi a0, 0
+                \\ movi a7, 0
+                \\ mov a6, sp
+                \\ movi a8, -16
+                \\ and sp, sp, a8
+                \\ call4 %[posixCallMainAndExit]
             ,
             else => @compileError("unsupported arch"),
         }