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Re: gdb/493: linux inf funcall fails


The following reply was made to PR gdb/493; it has been noted by GNATS.

From: "Golubev I. N." <gin@mo.msk.ru>
To: gdb-gnats@sources.redhat.com, gdb-prs@sources.redhat.com
Cc:  
Subject: Re: gdb/493: linux inf funcall fails
Date: Mon, 22 Apr 2002 13:13:23 (GMT)

 Repeating `uname -a' output.
 
 Linux host 2.2.19-7.1.asp #1 Tue Oct 23 10:14:04 EDT 2001 i686 unknown
 
 `j*<stack memory location>' causes SIGSEGV in target process,
 regardless of code placed in location being jumped to.
 
 It appears to me that this ASP linux forbids running instructions
 located in stack, that is, `(CALL_DUMMY_LOCATION == ON_STACK)' way of
 doing things in `hand_function_call' is unsuitable to this system.
 However, just
 
 #define CALL_DUMMY_LOCATION AT_ENTRY_POINT
 
 is not enough.  It causes the following.
 
 #8  0x080c48a0 in internal_verror (
     file=0x81487e0 "../../gdb-5.1.1/gdb/infcmd.c", line=873, 
     fmt=0x81487cd "CALL_DUMMY_ADDRESS", ap=0x8049cb0)
     at ../../gdb-5.1.1/gdb/utils.c:697
 #9  0x08089231 in run_stack_dummy (addr=134519984, buffer=0xbffff040 )
     at ../../gdb-5.1.1/gdb/infcmd.c:870
 #10 0x08074a82 in hand_function_call (function=0x8256ed0, nargs=1, 
     args=0xbffff254) at ../../gdb-5.1.1/gdb/valops.c:1655
 
 Apparently changing `CALL_DUMMY_LOCATION' requires some additional
 adjustment.
 
 Apparently most other linux'es allow executing code in stack.  Then
 whether system allows that is not clear from its `uname' output.  So
 deciding whether to do such an adjustments requires some configure-
 time checks.  Did it ever happen to other systems, so that existing
 configuration code may be used as a source of inspiration?


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