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From: "J.W. Jagersma (jwjagersma AT gmail DOT com) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
To: djgpp AT delorie DOT com
Cc: "J.W. Jagersma" <jwjagersma AT gmail DOT com>
Subject: [PATCH] increase stack and malloc alignment to 16 bytes
Date: Thu, 25 Nov 2021 16:13:24 +0100
Message-Id: <20211125151322.439824-1-jwjagersma@gmail.com>
X-Mailer: git-send-email 2.33.0
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Reply-To: djgpp AT delorie DOT com

The section alignment patch I posted here earlier has been accepted in binutils,
so that will be available in the next release.

Now in libc only these two lines need to be adjusted, and then all code, data,
stack and heap will be aligned to 16 byte boundaries.

Should be good for SSE, hopefully it will help resolve the gcc 11 Ada issue too.

---
 src/libc/ansi/stdlib/nmalcdef.h | 2 +-
 src/libc/crt0/crt0.S            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/libc/ansi/stdlib/nmalcdef.h b/src/libc/ansi/stdlib/nmalcdef.h
index cb41f619..495c63a6 100644
--- a/src/libc/ansi/stdlib/nmalcdef.h
+++ b/src/libc/ansi/stdlib/nmalcdef.h
@@ -188,7 +188,7 @@ typedef struct memblock {
 /* conversion and access macros */
 #define MEMBLKp(p) (memblockp)((byte*)(p) - DATAOFFSET)
 #define PTR(m)     (void*)((byte*)(m) + DATAOFFSET)
-#define ALIGN 8
+#define ALIGN 16
 
 #define ALIGNMASK (ALIGN-1)
 
diff --git a/src/libc/crt0/crt0.S b/src/libc/crt0/crt0.S
index 446a989b..226f0cb9 100644
--- a/src/libc/crt0/crt0.S
+++ b/src/libc/crt0/crt0.S
@@ -315,7 +315,7 @@ use_stubinfo_stack_size:
 	addl	__stklen, %eax
 	movw	%ds, %dx		/* set stack */
 	movw	%dx, %ss
-	andb	$0xf8, %al		/* align to 8-byte boundary */
+	andb	$0xf0, %al		/* align to 16-byte boundary */
 	movl	%eax, %esp
 	movl	%eax, ___djgpp_stack_top	/* Top of stack */
 	subl	___djgpp_stack_limit, %eax
-- 
2.33.0