1 files changed, 48 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/ia64/cancellation-pc-check.h b/sysdeps/unix/sysv/linux/ia64/cancellation-pc-check.h
new file mode 100644
index 0000000000..24f05f9759
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/ia64/cancellation-pc-check.h
@@ -0,0 +1,48 @@
+/* Architecture specific bits for cancellation handling.
+   Copyright (C) 2023 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _NPTL_CANCELLATION_PC_CHECK
+#define _NPTL_CANCELLATION_PC_CHECK 1
+
+/* Check if the program counter (PC) from ucontext CTX is within the start and
+   then end boundary from the __syscall_cancel_arch bridge.  Return TRUE if
+   the PC is within the boundary, meaning the syscall does not have any side
+   effects; or FALSE otherwise.  */
+static bool
+cancellation_pc_check (void *ctx)
+{
+  /* Both are defined in syscall_cancel.S for each architecture.  */
+  extern const char __syscall_cancel_arch_start[1];
+  extern const char __syscall_cancel_arch_end[1];
+
+  uintptr_t sc_ip = ((struct sigcontext *) (ctx))->sc_ip;
+  uintptr_t cr_iip = sc_ip & ~0x3ull;
+  uintptr_t ri = sc_ip & 0x3ull;
+
+  /* IA64 __syscall_cancel_arch issues the 'break 0x100000' on its own bundle,
+     and __syscall_cancel_arch_end points to end of the previous bundle.
+     To check if the syscall had any side-effects we need to check the slot
+     number.  */
+  if (cr_iip == (uintptr_t) __syscall_cancel_arch_end)
+    return ri == 0;
+
+  return cr_iip >= (uintptr_t) __syscall_cancel_arch_start
+	 && cr_iip < (uintptr_t) __syscall_cancel_arch_end;
+}
+
+#endif