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Unset gdbarch significant_addr_bit by default

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This patch fixes a bug introduced by fix to AArch64 pointer tagging.

In our fix for tagged pointer support our agreed approach was to sign
extend user-space address after clearing tag bits. This is not same
for all architectures and this patch allows sign extension for
addresses on targets which specifically set significant_addr_bit.

More information about patch that caused the issues and discussion
around tagged pointer support can be found in links below:

https://sourceware.org/ml/gdb-patches/2018-05/msg00000.html
https://sourceware.org/ml/gdb-patches/2017-12/msg00159.html

gdb/ChangeLog:

2018-05-31  Omair Javaid  <omair.javaid@linaro.org>

	PR gdb/23210
	* gdbarch.sh (significant_addr_bit): Default to zero when
	not set by target architecture.
	* gdbarch.c: Re-generated.
	* utils.c (address_significant): Update.
This commit is contained in:
Omair Javaid
2018-05-26 05:58:51 +05:00
parent 0034eed03a
commit 5969f0dba7
4 changed files with 14 additions and 5 deletions
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5
gdb/utils.c
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@ -2708,10 +2708,11 @@ address_significant (gdbarch *gdbarch, CORE_ADDR addr)
/* 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. */
when it won't occur. Skip updating of target address if current target
has not set gdbarch significant_addr_bit. */
int addr_bit = gdbarch_significant_addr_bit (gdbarch);
if (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT))
if (addr_bit && (addr_bit < (sizeof (CORE_ADDR) * HOST_CHAR_BIT)))
{
CORE_ADDR sign = (CORE_ADDR) 1 << (addr_bit - 1);
addr &= ((CORE_ADDR) 1 << addr_bit) - 1;