[PATCH] Cygwin: dumper: add Aarch64 support

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Hi Everyone,
This patch adds Aarch64 support to the core dumper utility. Previously, dum=
per.cc used "elf64-aarch64" as the BFD target name, which is not a valid BF=
D target vector which caused bfd_openw() to fail with "invalid bfd target" =
on Aarch64. This has been corrected to "elf64-littleaarch64", matching the =
aarch64_elf64_le_vec vector registered by BFD.
 Additionally, bfd_set_arch_mach() was unconditionally called with bfd_arch=
_i386, which is only correct for the x86_64 build. This is now conditionali=
zed so Aarch64 builds use bfd_arch_aarch64 / bfd_mach_aarch64 instead.
Thanks and Regards,
Aswin Kalies
Inline Patch
---
 winsup/utils/Makefile.am |  2 +-
 winsup/utils/dumper.cc   | 20 ++++++++++++++------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/winsup/utils/Makefile.am b/winsup/utils/Makefile.am
index e44079a41..a4521f2ab 100644
--- a/winsup/utils/Makefile.am
+++ b/winsup/utils/Makefile.am
@@ -79,7 +79,7 @@ LDADD =3D -lnetapi32
 cygpath_CXXFLAGS =3D -fno-threadsafe-statics $(AM_CXXFLAGS)
 cygpath_LDADD =3D $(LDADD) -luserenv -lntdll
 dumper_CXXFLAGS =3D -I$(top_srcdir)/../include $(AM_CXXFLAGS)
-dumper_LDADD =3D $(LDADD) -lpsapi -lntdll -lbfd @BFD_LIBS@
+dumper_LDADD =3D $(LDADD) -lpsapi -lntdll -lbfd -lsframe @BFD_LIBS@
 dumper_LDFLAGS =3D -Wl,--disable-high-entropy-va
 ldd_LDADD =3D $(LDADD) -lpsapi -lntdll
 mount_CXXFLAGS =3D -DFSTAB_ONLY $(AM_CXXFLAGS)
diff --git a/winsup/utils/dumper.cc b/winsup/utils/dumper.cc
index b3151e66d..830cf9ce1 100644
--- a/winsup/utils/dumper.cc
+++ b/winsup/utils/dumper.cc
@@ -703,7 +703,7 @@ dumper::init_core_dump ()
 #if defined(__x86_64__)
   const char *target =3D "elf64-x86-64";
 #elif defined(__aarch64__)
-  const char *target =3D "elf64-aarch64";
+  const char *target =3D "elf64-littleaarch64";
 #else
 #error unimplemented for this target
 #endif
@@ -721,11 +721,19 @@ dumper::init_core_dump ()
       goto failed;
     }

-  if (!bfd_set_arch_mach (core_bfd, bfd_arch_i386, 0 /* =3D default */))
-    {
-      bfd_perror ("setting bfd architecture");
-      goto failed;
-    }
+#if defined(__x86_64__)
+  if (!bfd_set_arch_mach(core_bfd, bfd_arch_i386, 0 /* =3D default */))
+  {
+   bfd_perror("setting bfd architecture");
+   goto failed;
+  }
+#elif defined(__aarch64__)
+  if (!bfd_set_arch_mach(core_bfd, bfd_arch_aarch64, bfd_mach_aarch64))
+  {
+   bfd_perror("setting bfd architecture");
+   goto failed;
+  }
+#endif

   return 1;

--
2.49.0.windows.1





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	name="Cygwin-dumper-add-Aarch64-support.patch"
Content-Description: Cygwin-dumper-add-Aarch64-support.patch
Content-Disposition: attachment;
	filename="Cygwin-dumper-add-Aarch64-support.patch"; size=2634;
	creation-date="Thu, 09 Jul 2026 10:13:10 GMT";
	modification-date="Thu, 09 Jul 2026 10:13:37 GMT"
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