src/gdb ChangeLog mips-irix-tdep.c

[brobecke at sourceware dot org]

CVSROOT:	/cvs/src
Module name:	src
Changes by:	brobecke@sourceware.org	2010-11-23 01:06:08

Modified files:
	gdb            : ChangeLog mips-irix-tdep.c 

Log message:
	support for mips-irix on-stack trampolines
	
	On mips-irix, the debugger has trouble stepping over the following
	line of code:
	
	S: Shape'Class := R;   <<<<---- STOP here
	
	Here is what happens:
	
	(gdb) n
	warning: GDB can't find the start of the function at 0x7fff2bd8.
	
	GDB is unable to find the start of the function at 0x7fff2bd8
	and thus can't determine the size of that function's stack frame.
	This means that GDB may be unable to access that stack frame, or
	the frames below it.
	This problem is most likely caused by an invalid program counter or
	stack pointer.
	However, if you think GDB should simply search farther back
	from 0x7fff2bd8 for code which looks like the beginning of a
	function, you can increase the range of the search using the `set
	heuristic-fence-post' command.
	0x7fff2bd8 in ?? ()
	
	The program does in fact jump to this code location, which is a trampoline
	located on the stack (there is an implicit call to a routine internally
	generated by the Ada expander). As it is on the stack, GDB is naturally
	unable to find the bounds of the current function, or any debugging
	information, and is thus unable to continue.
	
	This patch adds support for this sort of trampoline.
	
	gdb/ChangeLog:
	
	* mips-irix-tdep.c (mips_irix_n32_stack_tramp_frame_init): New
	function.
	(mips_irix_n32_stack_tramp_frame): New static global.
	(mips_irix_init_abi): Add mips_irix_n32_stack_tramp_frame to
	list of unwinder.

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.12333&r2=1.12334
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/mips-irix-tdep.c.diff?cvsroot=src&r1=1.11&r2=1.12