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Yao Qi f7a6a40dbc Detect the arm/thumb mode of code SIGRETURN or RT_SIGRETURN returns to
This patch fixes the following regression introduced by commit d0e59a68

step^M
39      } /* handler */^M
1: x/i $pc^M
=> 0x8740 <handler+80>: sub     sp, r11, #0^M
(gdb) step^M
^M
Program received signal SIGSEGV, Segmentation fault.^M
setitimer () at ../sysdeps/unix/syscall-template.S:81^M
81      ../sysdeps/unix/syscall-template.S: No such file or directory.^M
1: x/i $pc^M
=> 0xb6eff9c0 <setitimer>:      push    {r7}^M
(gdb) FAIL: gdb.base/sigstep.exp: continue to handler, si+advance in handler, step from handler: leave handler

in my test setting, program is compiled in arm mode, but the glibc
is built in thumb mode, so when we do 'step' to step over syscall
instruction svc for SIGRETURN, GDB should set breakpoint for arm mode
in the program, even though the current program in glibc is in thumb
mode.  Current GDB doesn't consider the case that the mode of program
SIGRETURN goes to can be different from current program mode.

In fact, GDB has taken care of this arm/thumb mode changes already,
see

/* Copy the value of next pc of sigreturn and rt_sigrturn into PC,
   return 1.  In addition, set IS_THUMB depending on whether we
   will return to ARM or Thumb code.  Return 0 if it is not a
   rt_sigreturn/sigreturn syscall.  */
static int
arm_linux_sigreturn_return_addr (struct frame_info *frame,
				 unsigned long svc_number,
				 CORE_ADDR *pc, int *is_thumb)

but in the commit d0e59a68

> -  arm_linux_sigreturn_return_addr (frame, svc_number, &return_addr, &is_thumb);
> +  if (svc_number == ARM_SIGRETURN || svc_number == ARM_RT_SIGRETURN)
> +    next_pc = arm_linux_sigreturn_next_pc (regcache, svc_number);

the IS_THUMB setting is lost, so it is a regression.

gdb:

2016-01-21  Yao Qi  <yao.qi@linaro.org>

	* arm-linux-tdep.c (arm_linux_sigreturn_next_pc): Add parameter
	is_thumb and set it according to CPSR saved on the stack.
	(arm_linux_get_next_pcs_syscall_next_pc): Pass is_thumb to
	arm_linux_sigreturn_next_pc.

gdb/gdbserver:

2016-01-21  Yao Qi  <yao.qi@linaro.org>

	* linux-arm-low.c (arm_sigreturn_next_pc): Add parameter
	is_thumb and set it according to CPSR saved on the stack.
	(get_next_pcs_syscall_next_pc): Pass is_thumb to
	arm_sigreturn_next_pc.
2016-01-21 07:48:50 +00:00
bfd Automatic date update in version.in 2016-01-21 00:00:08 +00:00
binutils Fix dlltool tests for ARM targets, which do not support the --leading-underscore option. 2016-01-20 14:52:33 +00:00
config Provide AC_PROG_LEX that copes with LEX=missing from top-level 2016-01-18 22:17:57 +10:30
cpu Remove leading/trailing white spaces in ChangeLog 2015-07-24 04:16:47 -07:00
elfcpp Remove typename from Mips64_rela_data 2016-01-12 12:08:06 -08:00
etc PR external/{16327,16328}: Remove etc/configure.texi and etc/standards.texi. 2014-06-27 11:33:25 +02:00
gas Fix unexpected failures in GAS testsuite for ARM VxWorks target. 2016-01-20 17:02:42 +00:00
gdb Detect the arm/thumb mode of code SIGRETURN or RT_SIGRETURN returns to 2016-01-21 07:48:50 +00:00
gold [gold][aarch64] PR gold/19472 - DSOs need pc-relative stubs. 2016-01-15 17:10:04 -08:00
gprof Regen configure 2016-01-17 12:28:14 +10:30
include Add support to readelf for reading FreeBSD ELF core notes. 2016-01-19 08:15:08 -08:00
intl Regen intl/configure 2015-08-31 12:53:36 +09:30
ld Fix linker testsuite failures for arm-pe targets. 2016-01-20 15:41:06 +00:00
libdecnumber Remove leading/trailing white spaces in ChangeLog 2015-07-24 04:16:47 -07:00
libiberty libiberty: {count,dup,write}argv: constify argv input slightly 2016-01-05 15:25:13 -05:00
opcodes [AArch64] Reject invalid immediate operands to MSR UAO 2016-01-20 14:25:46 +00:00
readline Revert "Sync readline/ to version 7.0 alpha" 2015-07-25 15:57:00 -04:00
sim MIPS: Only build microMIPS specific simulator functions if microMIPS support is required. 2016-01-18 21:50:00 +00:00
texinfo * texinfo/texinfo.tex: Update to version 2009-03-28.05. 2009-04-21 12:36:46 +00:00
zlib Import zlib 1.2.8 with local change merged in. 2015-11-25 15:14:47 -08:00
.cvsignore
.gitattributes Add a .gitattributes file for use with git-merge-changelog 2014-07-25 18:07:23 -04:00
.gitignore Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
ChangeLog Sync top-level btool.m4 with GCC 2016-01-12 08:44:52 -08:00
compile Update from upstream Automake 2014-11-16 13:43:48 +01:00
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config.guess Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
config.rpath Remove freebsd1 from libtool.m4 macros and config.rpath. 2011-02-13 21:00:14 +00:00
config.sub Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
configure Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
configure.ac Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
COPYING
COPYING.LIB
COPYING.LIBGLOSS 2013-01-07 Jeff Johnston <jjohnstn@redhat.com> 2013-01-07 21:39:26 +00:00
COPYING.NEWLIB 2013-10-01 Jeff Johnston <jjohnstn@redhat.com> 2013-10-01 18:14:04 +00:00
COPYING3
COPYING3.LIB
depcomp Update from upstream Automake 2014-11-16 13:43:48 +01:00
djunpack.bat * djunpack.bat: Use ".." quoting in Sed command, for the sake of 2009-03-27 13:37:09 +00:00
install-sh Update from upstream Automake 2014-11-16 13:43:48 +01:00
libtool.m4 Sync top-level btool.m4 with GCC 2016-01-12 08:44:52 -08:00
ltgcc.m4 * libtool.m4: Update to libtool 2.2.6. 2008-09-29 15:28:14 +00:00
ltmain.sh PR target/59788 2014-02-06 11:01:57 +01:00
ltoptions.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
ltsugar.m4 * libtool.m4: Update to libtool 2.2.6. 2008-09-29 15:28:14 +00:00
ltversion.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
lt~obsolete.m4 Sync Libtool from GCC. 2010-01-09 21:11:44 +00:00
MAINTAINERS Update description of ownership of files in include/ 2014-11-04 16:14:14 -08:00
Makefile.def Sync top-level Makefile.def with GCC 2016-01-12 08:34:40 -08:00
Makefile.in Sync top-level Makefile.def with GCC 2016-01-12 08:34:40 -08:00
Makefile.tpl Import changes made to files shared with the FSF GCC project. 2016-01-11 11:06:56 +00:00
makefile.vms
missing Update from upstream Automake 2014-11-16 13:43:48 +01:00
mkdep
mkinstalldirs Update from upstream Automake 2014-11-16 13:43:48 +01:00
move-if-change Update `move-if-change' from gnulib 2014-11-16 17:04:02 +01:00
README
README-maintainer-mode Cleanups after the update to Autoconf 2.64, Automake 1.11. 2009-08-22 17:08:11 +00:00
setup.com 2009-09-01 Tristan Gingold <gingold@adacore.com> 2009-09-01 13:38:26 +00:00
src-release.sh fix gdb version parsing in src-release.sh 2016-01-17 10:01:55 +04:00
symlink-tree
ylwrap Update from upstream Automake 2014-11-16 13:43:48 +01:00

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