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Teach stackinfo::walk() how to virtually unwind the tls sigstack

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This improves how stackinfo::dumpstack() dumps _sigbe and sigdelayed frames

	* exceptions.cc (stack_info): Add sigstackptr member.
	(walk): Unwind sigstackptr inside _sigbe and sigdelayed.
	* gendef (_sigdelayed_end): Add symbol to mark end of sigdelayed.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
This commit is contained in:
Jon TURNEY
2015-03-09 21:55:29 +00:00
parent 63c9ffeed8
commit e9e47b8ce6
3 changed files with 21 additions and 0 deletions
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13
winsup/cygwin/exceptions.cc
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@ -45,6 +45,8 @@ details. */
#define CALL_HANDLER_RETRY_INNER 10
char debugger_command[2 * NT_MAX_PATH + 20];
extern u_char _sigbe;
extern u_char _sigdelayed_end;
static BOOL WINAPI ctrl_c_handler (DWORD);
@ -224,6 +226,7 @@ class stack_info
#ifdef __x86_64__
CONTEXT c;
UNWIND_HISTORY_TABLE hist;
__stack_t *sigstackptr;
#endif
public:
STACKFRAME sf; /* For storing the stack information */
@ -252,6 +255,7 @@ stack_info::init (PUINT_PTR framep, bool wantargs, PCONTEXT ctx)
memset (&c, 0, sizeof c);
c.ContextFlags = CONTEXT_ALL;
}
sigstackptr = _my_tls.stackptr;
#endif
memset (&sf, 0, sizeof (sf));
if (ctx)
@ -287,6 +291,15 @@ stack_info::walk ()
sf.AddrStack.Offset = c.Rsp;
sf.AddrFrame.Offset = c.Rbp;
if ((c.Rip >= (DWORD64)&_sigbe) && (c.Rip < (DWORD64)&_sigdelayed_end))
{
/* _sigbe and sigdelayed don't have SEH unwinding data, so virtually
unwind the tls sigstack */
c.Rip = sigstackptr[-1];
sigstackptr--;
return 1;
}
f = RtlLookupFunctionEntry (c.Rip, &imagebase, &hist);
if (f)
RtlVirtualUnwind (0, imagebase, c.Rip, f, &c, &hdl, &establisher, NULL);