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From: Jan Beulich <jbeulich@suse.com>
To: "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>
Cc: "Andrew Cooper" <andrew.cooper3@citrix.com>,
	"Wei Liu" <wl@xen.org>, "Roger Pau Monné" <roger.pau@citrix.com>
Subject: [PATCH v2 1/3] x86/EFI: sections may not live at VA 0 in PE binaries
Date: Fri, 23 Apr 2021 13:03:34 +0200	[thread overview]
Message-ID: <748d35dc-5a2f-302f-d789-9797c6726810@suse.com> (raw)
In-Reply-To: <89e97459-28fd-704f-d424-88afa3a2a4a5@suse.com>

PE binaries specify section addresses by (32-bit) RVA. GNU ld up to at
least 2.36 would silently truncate the (negative) difference when a
section is placed below the image base. Such sections would also be
wrongly placed ahead of all "normal" ones. Since, for the time being,
we build xen.efi with --strip-debug anyway, .stab* can't appear. And
.comment has an entry in /DISCARD/ already anyway in the EFI case.

Because of their unclear origin, keep the directives for the ELF case
though.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
---
It's certainly odd that we have stabs section entries in the script, but
no Dwarf ones.

--- a/xen/arch/x86/xen.lds.S
+++ b/xen/arch/x86/xen.lds.S
@@ -350,6 +350,7 @@ SECTIONS
 #endif
   }
 
+#ifndef EFI
   /* Stabs debugging sections.  */
   .stab 0 : { *(.stab) }
   .stabstr 0 : { *(.stabstr) }
@@ -358,6 +359,7 @@ SECTIONS
   .stab.index 0 : { *(.stab.index) }
   .stab.indexstr 0 : { *(.stab.indexstr) }
   .comment 0 : { *(.comment) }
+#endif
 }
 
 ASSERT(__2M_rwdata_end <= XEN_VIRT_END - XEN_VIRT_START + __XEN_VIRT_START -



  reply	other threads:[~2021-04-23 11:03 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-23 11:02 [PATCH v2 0/3] x86/EFI: build adjustments Jan Beulich
2021-04-23 11:03 ` Jan Beulich [this message]
2021-04-23 14:25   ` [PATCH v2 1/3] x86/EFI: sections may not live at VA 0 in PE binaries Roger Pau Monné
2021-04-23 14:46     ` Jan Beulich
2021-04-23 11:04 ` [PATCH v2 2/3] x86/EFI: keep debug info in xen.efi Jan Beulich
2021-04-23 14:27   ` Roger Pau Monné
2021-04-23 11:04 ` [PATCH v2 3/3] x86/EFI: don't have an overly large image size Jan Beulich

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