9os

commit 696080fccb78ca5887bb7b507dac6a62e8fb2b2f
parent bfed1813cb8fb136c4f79e2781c73b51375035f0
Author: Roberto E. Vargas Caballero <k0ga@shike2.com>
Date:   Mon, 25 Nov 2024 15:42:25 +0100

os9/arm64: Use X0 in dupctx()

Dupctx() was doing modifications to X29, that is the frame pointer of
the current function, while it makes more sense to use X0 that is the
value returned by a function.

Diffstat:
M
src/os9/arch/arm64/ctx.c
 | 
6
+++---

1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/src/os9/arch/arm64/ctx.c b/src/os9/arch/arm64/ctx.c
@@ -110,16 +110,16 @@ panic(const char *msg)
 int
 dupctx(Task *tp)
 {
-	proc->ctx.r[X29] = 1;
+	proc->ctx.r[X0] = 1;
 	getctx(&tp->ctx);
-	tp->ctx.r[X29] = 0;
+	tp->ctx.r[X0] = 0;
 
 	/*
 	 * When this function is called tp and proc are different pointers
 	 * but when the context of tp is restored and the execution comes
 	 * here then tp and proc are the same pointer
 	 */
-	return proc->ctx.r[X29];
+	return proc->ctx.r[X0];
 }
 
 void