From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Fri, 13 Jun 2025 14:23:44 +0000 (-0300)
Subject: sparc: Fix sparc32 Fix argument passing to __libc_start_main (BZ 32981)
X-Git-Tag: glibc-2.42~110
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=8788bd77d68c6429c7f2dcbd22765525555c3cd8;p=thirdparty%2Fglibc.git

sparc: Fix sparc32 Fix argument passing to __libc_start_main (BZ 32981)

Commit 404526ee2e58f3c075253943ddc9988f4bd6b80c changed _start to write
the last argument to __libc_start_main without taking into consideration
that the function did not create a full stack frame, which leads to
overwriting the argv[0].
---

diff --git a/sysdeps/sparc/sparc32/start.S b/sysdeps/sparc/sparc32/start.S
index cef7c96cac..8393760da6 100644
--- a/sysdeps/sparc/sparc32/start.S
+++ b/sysdeps/sparc/sparc32/start.S
@@ -35,6 +35,7 @@
 
 #include <sysdep.h>
 
+#define FRAME_SIZE 104
 
 	.section ".text"
 	.align 4
@@ -48,12 +49,12 @@ _start:
   /* Terminate the stack frame, and reserve space for functions to
      drop their arguments.  */
 	mov	%g0, %fp
-	sub	%sp, 6*4, %sp
+	sub	%sp, FRAME_SIZE, %sp
 
   /* Extract the arguments and environment as encoded on the stack.  The
      argument info starts after one register window (16 words) past the SP.  */
-	ld	[%sp+22*4], %o1
-	add	%sp, 23*4, %o2
+	ld	[%sp+168], %o1
+	add	%sp, 172, %o2
 
   /* Load the addresses of the user entry points.  */
 #ifndef PIC