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Sergio Durigan Junior d7b30f6729 Fix for PR tdep/16397: SystemTap SDT probe support for x86 doesn't work with "triplet operands" 
This is the continuation of what Joel proposed on:

<https://sourceware.org/ml/gdb-patches/2013-12/msg00977.html>

Now that I have already submitted and pushed the patch to split
i386_stap_parse_special_token into two smaller functions, it is indeed
simpler to understand this patch.

It occurs because, on x86, triplet displacement operands are allowed
(like "-4+8-20(%rbp)"), and the current parser for this expression is
buggy.  It does not correctly extract the register name from the
expression, which leads to incorrect evaluation.  The parser was also
being very "generous" with the expression, so I included a few more
checks to ensure that we're indeed dealing with a triplet displacement
operand.

This patch also includes testcases for the two different kind of
expressions that can be encountered on x86: the triplet displacement
(explained above) and the three-argument displacement (as in
"(%rbx,%ebx,-8)").  The tests are obviously arch-dependent and are
placed under gdb.arch/.

Message-ID: <m3mwj1j12v.fsf@redhat.com>
URL: <https://sourceware.org/ml/gdb-patches/2014-01/msg00310.html>

gdb/
2014-02-20  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR tdep/16397
	* i386-tdep.c (i386_stap_parse_special_token_triplet): Check if a
	number comes after the + or - signs.  Adjust length of register
	name to be extracted.

gdb/testsuite/
2014-02-20  Sergio Durigan Junior  <sergiodj@redhat.com>

	PR tdep/16397
	* gdb.arch/amd64-stap-special-operands.exp: New file.
	* gdb.arch/amd64-stap-three-arg-disp.S: Likewise.
	* gdb.arch/amd64-stap-three-arg-disp.c: Likewise.
	* gdb.arch/amd64-stap-triplet.S: Likewise.
	* gdb.arch/amd64-stap-triplet.c: Likewise.
 		2014-02-20 18:49:09 -03:00
..
Makefile.in This changeset makes sparc64_linux_step_trap to return 0 when a 2014-01-29 07:15:05 -08:00
alpha-step.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
alpha-step.exp Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
altivec-abi.c
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altivec-abi.exp Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
altivec-regs.c
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altivec-regs.exp PowerPC64 little-endian fixes: AltiVec tests 2014-02-04 18:28:24 +01:00
amd64-byte.exp Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
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amd64-pseudo.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
amd64-stap-special-operands.exp Fix for PR tdep/16397: SystemTap SDT probe support for x86 doesn't work with "triplet operands" 2014-02-20 18:49:09 -03:00
amd64-stap-three-arg-disp.S Fix for PR tdep/16397: SystemTap SDT probe support for x86 doesn't work with "triplet operands" 2014-02-20 18:49:09 -03:00
amd64-stap-three-arg-disp.c Fix for PR tdep/16397: SystemTap SDT probe support for x86 doesn't work with "triplet operands" 2014-02-20 18:49:09 -03:00
amd64-stap-triplet.S Fix for PR tdep/16397: SystemTap SDT probe support for x86 doesn't work with "triplet operands" 2014-02-20 18:49:09 -03:00
amd64-stap-triplet.c Fix for PR tdep/16397: SystemTap SDT probe support for x86 doesn't work with "triplet operands" 2014-02-20 18:49:09 -03:00
amd64-tailcall-cxx.exp Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
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e500-abi.c
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i386-size-overlap.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
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i386-sse-stack-align.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
i386-sse-stack-align.exp Fix i386-sse-stack-align.exp regression since GDB_PARALLEL. 2014-02-06 23:14:20 +01:00
i386-sse.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
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mips-octeon-bbit.c 2012-08-19 Andrew Pinski <apinski@cavium.com> 2012-08-19 22:22:49 +00:00
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mips16-thunks-inmain.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
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pa-nullify.s
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pa64-nullify.s
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powerpc-d128-regs.c Update Copyright year range in all files maintained by GDB. 2014-01-01 07:54:24 +04:00
powerpc-d128-regs.exp PowerPC64 little-endian fixes: 128-bit DFP parameters / registers 2014-02-04 18:36:54 +01:00
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sparc-sysstep.c This changeset makes sparc64_linux_step_trap to return 0 when a 2014-01-29 07:15:05 -08:00
sparc-sysstep.exp This changeset makes sparc64_linux_step_trap to return 0 when a 2014-01-29 07:15:05 -08:00
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vsx-regs.c
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vsx-regs.exp PowerPC64 little-endian fixes: VSX tests and pseudo-regs 2014-02-04 18:31:38 +01:00