[PATCH] [PR gdb/23127] [AArch64] Fix tagged pointer support

[Omair Javaid <omair dot javaid at linaro dot org>]

This patch fixes tagged pointer support for AArch64 GDB. Linux kernel debugging
failure was reported after tagged pointer support was committed.

After a discussion around best path forward to manage tagged pointers on GDB
side we are going to disable tagged pointers support for aarch64-none-elf-gdb
because for non-linux applications we cant be sure if tagged pointers will be
used by MMU or not.

Also for aarch64-linux-gdb we are going to sign extend user-space address after
clearing tag bits. This will help us debug both kernel and user-space addresses
based on information from linux kernel documentation given below:

According to AArch64 memory map:
https://www.kernel.org/doc/Documentation/arm64/memory.txt

"User addresses have bits 63:48 set to 0 while the kernel addresses have
the same bits set to 1."

According to AArch64 tagged pointers document:
https://www.kernel.org/doc/Documentation/arm64/tagged-pointers.txt

The kernel configures the translation tables so that translations made
via TTBR0 (i.e. userspace mappings) have the top byte (bits 63:56) of
the virtual address ignored by the translation hardware. This frees up
this byte for application use.

Running gdb testsuite after applying this patch introduces no regressions and
tagged pointer test cases still pass.

gdb/ChangeLog:
2018-05-01  Omair Javaid  <omair.javaid@linaro.org>

	* aarch64-linux-tdep.c (aarch64_linux_init_abi): Add call to
	set_gdbarch_significant_addr_bit.
	* aarch64-tdep.c (aarch64_gdbarch_init): Remove call to
	set_gdbarch_significant_addr_bit.
	* utils.c (address_significant): Update to sign extend addr.
---
 gdb/aarch64-linux-tdep.c |  5 +++++
 gdb/aarch64-tdep.c       |  5 -----
 gdb/utils.c              | 14 +++++++++-----
 3 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/gdb/aarch64-linux-tdep.c b/gdb/aarch64-linux-tdep.c
index 1f3e888..ba5757d 100644
--- a/gdb/aarch64-linux-tdep.c
+++ b/gdb/aarch64-linux-tdep.c
@@ -1062,6 +1062,11 @@ aarch64_linux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
   /* Syscall record.  */
   tdep->aarch64_syscall_record = aarch64_linux_syscall_record;
 
+  /* The top byte of a user space address known as the "tag",
+     is ignored by the kernel and can be regarded as additional
+     data associated with the address.  */
+  set_gdbarch_significant_addr_bit (gdbarch, 56);
+
   /* Initialize the aarch64_linux_record_tdep.  */
   /* These values are the size of the type that will be used in a system
      call.  They are obtained from Linux Kernel source.  */
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index 01566b4..3c1f389 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2972,11 +2972,6 @@ aarch64_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
   set_tdesc_pseudo_register_reggroup_p (gdbarch,
 					aarch64_pseudo_register_reggroup_p);
 
-  /* The top byte of an address is known as the "tag" and is
-     ignored by the kernel, the hardware, etc. and can be regarded
-     as additional data associated with the address.  */
-  set_gdbarch_significant_addr_bit (gdbarch, 56);
-
   /* ABI */
   set_gdbarch_short_bit (gdbarch, 16);
   set_gdbarch_int_bit (gdbarch, 32);
diff --git a/gdb/utils.c b/gdb/utils.c
index b957b0d..1f9be8f 100644
--- a/gdb/utils.c
+++ b/gdb/utils.c
@@ -2704,14 +2704,18 @@ When set, debugging messages will be marked with seconds and microseconds."),
 CORE_ADDR
 address_significant (gdbarch *gdbarch, CORE_ADDR addr)
 {
-  /* Truncate address to the significant bits of a target address,
-     avoiding shifts larger or equal than the width of a CORE_ADDR.
-     The local variable ADDR_BIT stops the compiler reporting a shift
-     overflow when it won't occur.  */
+  /* Clear insignificant bits of a target address and sign extend resulting
+     address, avoiding shifts larger or equal than the width of a CORE_ADDR.
+     The local variable ADDR_BIT stops the compiler reporting a shift overflow
+     when it won't occur.  */
   int addr_bit = gdbarch_significant_addr_bit (gdbarch);
 
   if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT))
-    addr &= ((CORE_ADDR) 1 << addr_bit) - 1;
+    {
+      CORE_ADDR sign = (CORE_ADDR) 1 << (addr_bit - 1);
+      addr &= ((CORE_ADDR) 1 << addr_bit) - 1;
+      addr = (addr ^ sign) - sign;
+    }
 
   return addr;
 }
-- 
2.7.4