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Fix original stack when running signal handler on alternate stack

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* autoload.cc (SetThreadStackGuarantee): Import.
        * cygtls.h (struct _cygtls): Replace thread_context with a ucontext_t
        called context.
        * exceptions.cc (exception::handle): Exit from process via signal_exit
        in case sig_send returns from handling a stack overflow SIGSEGV.
        Explain why.
        (dumpstack_overflow_wrapper): Thread wrapper to create a stackdump
        from another thread.
        (signal_exit): Fix argument list to reflect three-arg signal handler.
        In case we have to create a stackdump for a stack overflow condition,
        do so from a separate thread.  Explain why.
        (sigpacket::process): Don't run signal_exit on alternate stack.
        (altstack_wrapper): Wrapper function to do stack correction when
        calling the signal handler on an alternate stack to handle a stack
        overflow.  Make sure to have lots of comments.
        (_cygtls::call_signal_handler): Drop local context variable to reduce
        stack pressure.  Use this->context instead.  Change inline assembler
        to call altstack_wrapper.
        (_cygtls::signal_debugger): Accommodate aforementioned change to
        struct _cygtls.
        * tlsoffset.h: Regenerate.
        * tlsoffset64.h: Regenerate.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-07-04 22:49:30 +02:00
parent 757c0871f7
commit 2cd7eb7f60
8 changed files with 291 additions and 134 deletions
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116
winsup/cygwin/tlsoffsets64.h
View File

@@ -31,34 +31,36 @@
//; $tls::psignal_arrived = 4152;
//; $tls::will_wait_for_signal = -8640;
//; $tls::pwill_wait_for_signal = 4160;
//; $tls::thread_context = -8632;
//; $tls::pthread_context = 4168;
//; $tls::thread_id = -7400;
//; $tls::pthread_id = 5400;
//; $tls::infodata = -7396;
//; $tls::pinfodata = 5404;
//; $tls::tid = -7248;
//; $tls::ptid = 5552;
//; $tls::_ctinfo = -7240;
//; $tls::p_ctinfo = 5560;
//; $tls::andreas = -7232;
//; $tls::pandreas = 5568;
//; $tls::wq = -7224;
//; $tls::pwq = 5576;
//; $tls::sig = -7176;
//; $tls::psig = 5624;
//; $tls::incyg = -7172;
//; $tls::pincyg = 5628;
//; $tls::spinning = -7168;
//; $tls::pspinning = 5632;
//; $tls::stacklock = -7164;
//; $tls::pstacklock = 5636;
//; $tls::stackptr = -7160;
//; $tls::pstackptr = 5640;
//; $tls::stack = -7152;
//; $tls::pstack = 5648;
//; $tls::initialized = -5104;
//; $tls::pinitialized = 7696;
//; $tls::__align = -8632;
//; $tls::p__align = 4168;
//; $tls::context = -8624;
//; $tls::pcontext = 4176;
//; $tls::thread_id = -7328;
//; $tls::pthread_id = 5472;
//; $tls::infodata = -7324;
//; $tls::pinfodata = 5476;
//; $tls::tid = -7176;
//; $tls::ptid = 5624;
//; $tls::_ctinfo = -7168;
//; $tls::p_ctinfo = 5632;
//; $tls::andreas = -7160;
//; $tls::pandreas = 5640;
//; $tls::wq = -7152;
//; $tls::pwq = 5648;
//; $tls::sig = -7104;
//; $tls::psig = 5696;
//; $tls::incyg = -7100;
//; $tls::pincyg = 5700;
//; $tls::spinning = -7096;
//; $tls::pspinning = 5704;
//; $tls::stacklock = -7092;
//; $tls::pstacklock = 5708;
//; $tls::stackptr = -7088;
//; $tls::pstackptr = 5712;
//; $tls::stack = -7080;
//; $tls::pstack = 5720;
//; $tls::initialized = -5032;
//; $tls::pinitialized = 7768;
//; __DATA__
#define tls_locals (-12800)
@@ -91,31 +93,33 @@
#define tls_psignal_arrived (4152)
#define tls_will_wait_for_signal (-8640)
#define tls_pwill_wait_for_signal (4160)
#define tls_thread_context (-8632)
#define tls_pthread_context (4168)
#define tls_thread_id (-7400)
#define tls_pthread_id (5400)
#define tls_infodata (-7396)
#define tls_pinfodata (5404)
#define tls_tid (-7248)
#define tls_ptid (5552)
#define tls__ctinfo (-7240)
#define tls_p_ctinfo (5560)
#define tls_andreas (-7232)
#define tls_pandreas (5568)
#define tls_wq (-7224)
#define tls_pwq (5576)
#define tls_sig (-7176)
#define tls_psig (5624)
#define tls_incyg (-7172)
#define tls_pincyg (5628)
#define tls_spinning (-7168)
#define tls_pspinning (5632)
#define tls_stacklock (-7164)
#define tls_pstacklock (5636)
#define tls_stackptr (-7160)
#define tls_pstackptr (5640)
#define tls_stack (-7152)
#define tls_pstack (5648)
#define tls_initialized (-5104)
#define tls_pinitialized (7696)
#define tls___align (-8632)
#define tls_p__align (4168)
#define tls_context (-8624)
#define tls_pcontext (4176)
#define tls_thread_id (-7328)
#define tls_pthread_id (5472)
#define tls_infodata (-7324)
#define tls_pinfodata (5476)
#define tls_tid (-7176)
#define tls_ptid (5624)
#define tls__ctinfo (-7168)
#define tls_p_ctinfo (5632)
#define tls_andreas (-7160)
#define tls_pandreas (5640)
#define tls_wq (-7152)
#define tls_pwq (5648)
#define tls_sig (-7104)
#define tls_psig (5696)
#define tls_incyg (-7100)
#define tls_pincyg (5700)
#define tls_spinning (-7096)
#define tls_pspinning (5704)
#define tls_stacklock (-7092)
#define tls_pstacklock (5708)
#define tls_stackptr (-7088)
#define tls_pstackptr (5712)
#define tls_stack (-7080)
#define tls_pstack (5720)
#define tls_initialized (-5032)
#define tls_pinitialized (7768)