Don't let two frames with the same id end up in the frame chain.
The UNWIND_SAME_ID check is done between THIS_FRAME and the next frame
when we go try to unwind the previous frame. But at this point, it's
already too late -- we ended up with two frames with the same ID in
the frame chain. Each frame having its own ID is an invariant assumed
throughout GDB. This patch applies the UNWIND_SAME_ID detection
earlier, right after the previous frame is unwound, discarding the dup
frame if a cycle is detected.
The patch includes a new test that fails before the change. Before
the patch, the test causes an infinite loop in GDB, after the patch,
the UNWIND_SAME_ID logic kicks in and makes the backtrace stop with:
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
The test uses dwarf CFI to emulate a corrupted stack with a cycle. It
has a function with registers marked DW_CFA_same_value (most
importantly RSP/RIP), so that GDB computes the same ID for that frame
and its caller. IOW, something like this:
#0 - frame_id_1
#1 - frame_id_2
#2 - frame_id_3
#3 - frame_id_4
#4 - frame_id_4 <<<< outermost (UNWIND_SAME_ID).
(The test's code is just a copy of dw2-reg-undefined.S /
dw2-reg-undefined.c, adjusted to use DW_CFA_same_value instead of
DW_CFA_undefined, and to mark a different set of registers.)
The infinite loop is here, in value_fetch_lazy:
while (VALUE_LVAL (new_val) == lval_register && value_lazy (new_val))
{
frame = frame_find_by_id (VALUE_FRAME_ID (new_val));
...
new_val = get_frame_register_value (frame, regnum);
}
get_frame_register_value can return a lazy register value pointing to
the next frame. This means that the register wasn't clobbered by
FRAME; the debugger should therefore retrieve its value from the next
frame.
To be clear, get_frame_register_value unwinds the value in question
from the next frame:
struct value *
get_frame_register_value (struct frame_info *frame, int regnum)
{
return frame_unwind_register_value (frame->next, regnum);
^^^^^^^^^^^
}
In other words, if we get a lazy lval_register, it should have the
frame ID of the _next_ frame, never of FRAME.
At this point in value_fetch_lazy, the whole relevant chunk of the
stack up to frame #4 has already been unwound. The loop always
"unlazies" lval_registers in the "next/innermost" direction, not in
the "prev/unwind further/outermost" direction.
So say we're looking at frame #4. get_frame_register_value in frame
#4 can return a lazy register value of frame #3. So the next
iteration, frame_find_by_id tries to read the register from frame #3.
But, since frame #4 happens to have same id as frame #3,
frame_find_by_id returns frame #4 instead. Rinse, repeat, and we have
an infinite loop.
This is an old latent problem, exposed by the recent addition of the
frame stash. Before we had a stash, frame_find_by_id(frame_id_4)
would walk over all frames starting at the current frame, and would
always find #3 first. The stash happens to return #4 instead:
struct frame_info *
frame_find_by_id (struct frame_id id)
{
struct frame_info *frame, *prev_frame;
...
/* Try using the frame stash first. Finding it there removes the need
to perform the search by looping over all frames, which can be very
CPU-intensive if the number of frames is very high (the loop is O(n)
and get_prev_frame performs a series of checks that are relatively
expensive). This optimization is particularly useful when this function
is called from another function (such as value_fetch_lazy, case
VALUE_LVAL (val) == lval_register) which already loops over all frames,
making the overall behavior O(n^2). */
frame = frame_stash_find (id);
if (frame)
return frame;
for (frame = get_current_frame (); ; frame = prev_frame)
{
gdb/
2013-11-22 Pedro Alves <palves@redhat.com>
PR 16155
* frame.c (get_prev_frame_1): Do the UNWIND_SAME_ID check between
this frame and the new previous frame, not between this frame and
the next frame.
gdb/testsuite/
2013-11-22 Pedro Alves <palves@redhat.com>
PR 16155
* gdb.dwarf2/dw2-dup-frame.S: New file.
* gdb.dwarf2/dw2-dup-frame.c: New file.
* gdb.dwarf2/dw2-dup-frame.exp: New file.
2013-11-22 11:51:59 +00:00
|
|
|
/*
|
2015-01-01 09:32:14 +00:00
|
|
|
Copyright 2013-2015 Free Software Foundation, Inc.
|
Don't let two frames with the same id end up in the frame chain.
The UNWIND_SAME_ID check is done between THIS_FRAME and the next frame
when we go try to unwind the previous frame. But at this point, it's
already too late -- we ended up with two frames with the same ID in
the frame chain. Each frame having its own ID is an invariant assumed
throughout GDB. This patch applies the UNWIND_SAME_ID detection
earlier, right after the previous frame is unwound, discarding the dup
frame if a cycle is detected.
The patch includes a new test that fails before the change. Before
the patch, the test causes an infinite loop in GDB, after the patch,
the UNWIND_SAME_ID logic kicks in and makes the backtrace stop with:
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
The test uses dwarf CFI to emulate a corrupted stack with a cycle. It
has a function with registers marked DW_CFA_same_value (most
importantly RSP/RIP), so that GDB computes the same ID for that frame
and its caller. IOW, something like this:
#0 - frame_id_1
#1 - frame_id_2
#2 - frame_id_3
#3 - frame_id_4
#4 - frame_id_4 <<<< outermost (UNWIND_SAME_ID).
(The test's code is just a copy of dw2-reg-undefined.S /
dw2-reg-undefined.c, adjusted to use DW_CFA_same_value instead of
DW_CFA_undefined, and to mark a different set of registers.)
The infinite loop is here, in value_fetch_lazy:
while (VALUE_LVAL (new_val) == lval_register && value_lazy (new_val))
{
frame = frame_find_by_id (VALUE_FRAME_ID (new_val));
...
new_val = get_frame_register_value (frame, regnum);
}
get_frame_register_value can return a lazy register value pointing to
the next frame. This means that the register wasn't clobbered by
FRAME; the debugger should therefore retrieve its value from the next
frame.
To be clear, get_frame_register_value unwinds the value in question
from the next frame:
struct value *
get_frame_register_value (struct frame_info *frame, int regnum)
{
return frame_unwind_register_value (frame->next, regnum);
^^^^^^^^^^^
}
In other words, if we get a lazy lval_register, it should have the
frame ID of the _next_ frame, never of FRAME.
At this point in value_fetch_lazy, the whole relevant chunk of the
stack up to frame #4 has already been unwound. The loop always
"unlazies" lval_registers in the "next/innermost" direction, not in
the "prev/unwind further/outermost" direction.
So say we're looking at frame #4. get_frame_register_value in frame
#4 can return a lazy register value of frame #3. So the next
iteration, frame_find_by_id tries to read the register from frame #3.
But, since frame #4 happens to have same id as frame #3,
frame_find_by_id returns frame #4 instead. Rinse, repeat, and we have
an infinite loop.
This is an old latent problem, exposed by the recent addition of the
frame stash. Before we had a stash, frame_find_by_id(frame_id_4)
would walk over all frames starting at the current frame, and would
always find #3 first. The stash happens to return #4 instead:
struct frame_info *
frame_find_by_id (struct frame_id id)
{
struct frame_info *frame, *prev_frame;
...
/* Try using the frame stash first. Finding it there removes the need
to perform the search by looping over all frames, which can be very
CPU-intensive if the number of frames is very high (the loop is O(n)
and get_prev_frame performs a series of checks that are relatively
expensive). This optimization is particularly useful when this function
is called from another function (such as value_fetch_lazy, case
VALUE_LVAL (val) == lval_register) which already loops over all frames,
making the overall behavior O(n^2). */
frame = frame_stash_find (id);
if (frame)
return frame;
for (frame = get_current_frame (); ; frame = prev_frame)
{
gdb/
2013-11-22 Pedro Alves <palves@redhat.com>
PR 16155
* frame.c (get_prev_frame_1): Do the UNWIND_SAME_ID check between
this frame and the new previous frame, not between this frame and
the next frame.
gdb/testsuite/
2013-11-22 Pedro Alves <palves@redhat.com>
PR 16155
* gdb.dwarf2/dw2-dup-frame.S: New file.
* gdb.dwarf2/dw2-dup-frame.c: New file.
* gdb.dwarf2/dw2-dup-frame.exp: New file.
2013-11-22 11:51:59 +00:00
|
|
|
|
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
|
|
|
it under the terms of the GNU General Public License as published by
|
|
|
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
|
|
|
(at your option) any later version.
|
|
|
|
|
|
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
|
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
|
GNU General Public License for more details.
|
|
|
|
|
|
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
|
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
|
|
|
|
|
|
/* The FDE entry for "stop_frame" in the .debug_frame section has
|
|
|
|
|
been hand modified to mark a set of registers as DW_CFA_same_value.
|
|
|
|
|
Otherwise this file is as generated by gcc 4.7.2 for x86_64. */
|
|
|
|
|
.file "dw2-dup-frame.c"
|
|
|
|
|
.text
|
|
|
|
|
.Ltext0:
|
|
|
|
|
.globl stop_frame
|
|
|
|
|
.type stop_frame, @function
|
|
|
|
|
stop_frame:
|
|
|
|
|
.LFB0:
|
|
|
|
|
.file 1 "dw2-dup-frame.c"
|
|
|
|
|
.loc 1 19 0
|
|
|
|
|
pushq %rbp
|
|
|
|
|
.LCFI0:
|
|
|
|
|
movq %rsp, %rbp
|
|
|
|
|
.LCFI1:
|
|
|
|
|
.loc 1 22 0
|
|
|
|
|
popq %rbp
|
|
|
|
|
.LCFI2:
|
|
|
|
|
ret
|
|
|
|
|
.LFE0:
|
|
|
|
|
.size stop_frame, .-stop_frame
|
|
|
|
|
.globl first_frame
|
|
|
|
|
.type first_frame, @function
|
|
|
|
|
first_frame:
|
|
|
|
|
.LFB1:
|
|
|
|
|
.loc 1 26 0
|
|
|
|
|
pushq %rbp
|
|
|
|
|
.LCFI3:
|
|
|
|
|
movq %rsp, %rbp
|
|
|
|
|
.LCFI4:
|
|
|
|
|
.loc 1 27 0
|
|
|
|
|
movl $0, %eax
|
|
|
|
|
call stop_frame
|
|
|
|
|
.loc 1 28 0
|
|
|
|
|
popq %rbp
|
|
|
|
|
.LCFI5:
|
|
|
|
|
ret
|
|
|
|
|
.LFE1:
|
|
|
|
|
.size first_frame, .-first_frame
|
|
|
|
|
.globl main
|
|
|
|
|
.type main, @function
|
|
|
|
|
main:
|
|
|
|
|
.LFB2:
|
|
|
|
|
.loc 1 32 0
|
|
|
|
|
pushq %rbp
|
|
|
|
|
.LCFI6:
|
|
|
|
|
movq %rsp, %rbp
|
|
|
|
|
.LCFI7:
|
|
|
|
|
.loc 1 33 0
|
|
|
|
|
movl $0, %eax
|
|
|
|
|
call first_frame
|
|
|
|
|
.loc 1 35 0
|
|
|
|
|
movl $0, %eax
|
|
|
|
|
.loc 1 36 0
|
|
|
|
|
popq %rbp
|
|
|
|
|
.LCFI8:
|
|
|
|
|
ret
|
|
|
|
|
.LFE2:
|
|
|
|
|
.size main, .-main
|
|
|
|
|
.section .debug_frame,"",@progbits
|
|
|
|
|
.Lframe0:
|
|
|
|
|
.long .LECIE0-.LSCIE0
|
|
|
|
|
.LSCIE0:
|
|
|
|
|
.long 0xffffffff
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.string ""
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.sleb128 -8
|
|
|
|
|
.byte 0x10
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.byte 0x90
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.align 8
|
|
|
|
|
.LECIE0:
|
|
|
|
|
/* This FDE entry, for stop_frame was modified to mark
|
|
|
|
|
registers 0 -> 16 (rax..ra/rip) as being DW_CFA_same_value. */
|
|
|
|
|
.LSFDE0:
|
|
|
|
|
.long .LEFDE0-.LASFDE0
|
|
|
|
|
.LASFDE0:
|
|
|
|
|
.long .Lframe0
|
|
|
|
|
.quad .LFB0
|
|
|
|
|
.quad .LFE0-.LFB0
|
|
|
|
|
|
|
|
|
|
/* START OF NEW CONTENT. */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x0 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x1 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x2 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x3 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x4 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x5 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x6 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x7 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x8 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x9 /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0xa /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0xb /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0xc /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0xd /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0xe /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0xf /* ULEB128 register */
|
|
|
|
|
.byte 0x8 /* DW_CFA_same_value */
|
|
|
|
|
.uleb128 0x10 /* ULEB128 register */
|
|
|
|
|
/* END OF NEW CONTENT. */
|
|
|
|
|
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI0-.LFB0
|
|
|
|
|
.byte 0xe
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.byte 0x86
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI1-.LCFI0
|
|
|
|
|
.byte 0xd
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI2-.LCFI1
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.align 8
|
|
|
|
|
.LEFDE0:
|
|
|
|
|
.LSFDE2:
|
|
|
|
|
.long .LEFDE2-.LASFDE2
|
|
|
|
|
.LASFDE2:
|
|
|
|
|
.long .Lframe0
|
|
|
|
|
.quad .LFB1
|
|
|
|
|
.quad .LFE1-.LFB1
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI3-.LFB1
|
|
|
|
|
.byte 0xe
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.byte 0x86
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI4-.LCFI3
|
|
|
|
|
.byte 0xd
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI5-.LCFI4
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.align 8
|
|
|
|
|
.LEFDE2:
|
|
|
|
|
.LSFDE4:
|
|
|
|
|
.long .LEFDE4-.LASFDE4
|
|
|
|
|
.LASFDE4:
|
|
|
|
|
.long .Lframe0
|
|
|
|
|
.quad .LFB2
|
|
|
|
|
.quad .LFE2-.LFB2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI6-.LFB2
|
|
|
|
|
.byte 0xe
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.byte 0x86
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI7-.LCFI6
|
|
|
|
|
.byte 0xd
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI8-.LCFI7
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.align 8
|
|
|
|
|
.LEFDE4:
|
|
|
|
|
.section .eh_frame,"a",@progbits
|
|
|
|
|
.Lframe1:
|
|
|
|
|
.long .LECIE1-.LSCIE1
|
|
|
|
|
.LSCIE1:
|
|
|
|
|
.long 0
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.string "zR"
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.sleb128 -8
|
|
|
|
|
.byte 0x10
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.byte 0x3
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.byte 0x90
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.align 8
|
|
|
|
|
.LECIE1:
|
|
|
|
|
.LSFDE7:
|
|
|
|
|
.long .LEFDE7-.LASFDE7
|
|
|
|
|
.LASFDE7:
|
|
|
|
|
.long .LASFDE7-.Lframe1
|
|
|
|
|
.long .LFB0
|
|
|
|
|
.long .LFE0-.LFB0
|
|
|
|
|
.uleb128 0
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI0-.LFB0
|
|
|
|
|
.byte 0xe
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.byte 0x86
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI1-.LCFI0
|
|
|
|
|
.byte 0xd
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI2-.LCFI1
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.align 8
|
|
|
|
|
.LEFDE7:
|
|
|
|
|
.LSFDE9:
|
|
|
|
|
.long .LEFDE9-.LASFDE9
|
|
|
|
|
.LASFDE9:
|
|
|
|
|
.long .LASFDE9-.Lframe1
|
|
|
|
|
.long .LFB1
|
|
|
|
|
.long .LFE1-.LFB1
|
|
|
|
|
.uleb128 0
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI3-.LFB1
|
|
|
|
|
.byte 0xe
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.byte 0x86
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI4-.LCFI3
|
|
|
|
|
.byte 0xd
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI5-.LCFI4
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.align 8
|
|
|
|
|
.LEFDE9:
|
|
|
|
|
.LSFDE11:
|
|
|
|
|
.long .LEFDE11-.LASFDE11
|
|
|
|
|
.LASFDE11:
|
|
|
|
|
.long .LASFDE11-.Lframe1
|
|
|
|
|
.long .LFB2
|
|
|
|
|
.long .LFE2-.LFB2
|
|
|
|
|
.uleb128 0
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI6-.LFB2
|
|
|
|
|
.byte 0xe
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.byte 0x86
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI7-.LCFI6
|
|
|
|
|
.byte 0xd
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.long .LCFI8-.LCFI7
|
|
|
|
|
.byte 0xc
|
|
|
|
|
.uleb128 0x7
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.align 8
|
|
|
|
|
.LEFDE11:
|
|
|
|
|
.text
|
|
|
|
|
.Letext0:
|
|
|
|
|
.section .debug_info,"",@progbits
|
|
|
|
|
.Ldebug_info0:
|
|
|
|
|
.long 0x8c
|
|
|
|
|
.value 0x2
|
|
|
|
|
.long .Ldebug_abbrev0
|
|
|
|
|
.byte 0x8
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.long .LASF2
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.long .LASF3
|
|
|
|
|
.long .LASF4
|
|
|
|
|
.quad .Ltext0
|
|
|
|
|
.quad .Letext0
|
|
|
|
|
.long .Ldebug_line0
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.long .LASF0
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.byte 0x12
|
|
|
|
|
.quad .LFB0
|
|
|
|
|
.quad .LFE0
|
|
|
|
|
.long .LLST0
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.long .LASF1
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.byte 0x19
|
|
|
|
|
.quad .LFB1
|
|
|
|
|
.quad .LFE1
|
|
|
|
|
.long .LLST1
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.uleb128 0x4
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.long .LASF5
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.byte 0x1f
|
|
|
|
|
.long 0x88
|
|
|
|
|
.quad .LFB2
|
|
|
|
|
.quad .LFE2
|
|
|
|
|
.long .LLST2
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.uleb128 0x5
|
|
|
|
|
.byte 0x4
|
|
|
|
|
.byte 0x5
|
|
|
|
|
.string "int"
|
|
|
|
|
.byte 0
|
|
|
|
|
.section .debug_abbrev,"",@progbits
|
|
|
|
|
.Ldebug_abbrev0:
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x11
|
|
|
|
|
.byte 0x1
|
|
|
|
|
.uleb128 0x25
|
|
|
|
|
.uleb128 0xe
|
|
|
|
|
.uleb128 0x13
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.uleb128 0xe
|
|
|
|
|
.uleb128 0x1b
|
|
|
|
|
.uleb128 0xe
|
|
|
|
|
.uleb128 0x11
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x12
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x10
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x2
|
|
|
|
|
.uleb128 0x2e
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x3f
|
|
|
|
|
.uleb128 0xc
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.uleb128 0xe
|
|
|
|
|
.uleb128 0x3a
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x3b
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x11
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x12
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x40
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.uleb128 0x2117
|
|
|
|
|
.uleb128 0xc
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.uleb128 0x2e
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x3f
|
|
|
|
|
.uleb128 0xc
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.uleb128 0xe
|
|
|
|
|
.uleb128 0x3a
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x3b
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x11
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x12
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x40
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.uleb128 0x2116
|
|
|
|
|
.uleb128 0xc
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x4
|
|
|
|
|
.uleb128 0x2e
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x3f
|
|
|
|
|
.uleb128 0xc
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.uleb128 0xe
|
|
|
|
|
.uleb128 0x3a
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x3b
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x49
|
|
|
|
|
.uleb128 0x13
|
|
|
|
|
.uleb128 0x11
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x12
|
|
|
|
|
.uleb128 0x1
|
|
|
|
|
.uleb128 0x40
|
|
|
|
|
.uleb128 0x6
|
|
|
|
|
.uleb128 0x2116
|
|
|
|
|
.uleb128 0xc
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0x5
|
|
|
|
|
.uleb128 0x24
|
|
|
|
|
.byte 0
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x3e
|
|
|
|
|
.uleb128 0xb
|
|
|
|
|
.uleb128 0x3
|
|
|
|
|
.uleb128 0x8
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.byte 0
|
|
|
|
|
.section .debug_loc,"",@progbits
|
|
|
|
|
.Ldebug_loc0:
|
|
|
|
|
.LLST0:
|
|
|
|
|
.quad .LFB0-.Ltext0
|
|
|
|
|
.quad .LCFI0-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 8
|
|
|
|
|
.quad .LCFI0-.Ltext0
|
|
|
|
|
.quad .LCFI1-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 16
|
|
|
|
|
.quad .LCFI1-.Ltext0
|
|
|
|
|
.quad .LCFI2-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x76
|
|
|
|
|
.sleb128 16
|
|
|
|
|
.quad .LCFI2-.Ltext0
|
|
|
|
|
.quad .LFE0-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 8
|
|
|
|
|
.quad 0
|
|
|
|
|
.quad 0
|
|
|
|
|
.LLST1:
|
|
|
|
|
.quad .LFB1-.Ltext0
|
|
|
|
|
.quad .LCFI3-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 8
|
|
|
|
|
.quad .LCFI3-.Ltext0
|
|
|
|
|
.quad .LCFI4-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 16
|
|
|
|
|
.quad .LCFI4-.Ltext0
|
|
|
|
|
.quad .LCFI5-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x76
|
|
|
|
|
.sleb128 16
|
|
|
|
|
.quad .LCFI5-.Ltext0
|
|
|
|
|
.quad .LFE1-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 8
|
|
|
|
|
.quad 0
|
|
|
|
|
.quad 0
|
|
|
|
|
.LLST2:
|
|
|
|
|
.quad .LFB2-.Ltext0
|
|
|
|
|
.quad .LCFI6-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 8
|
|
|
|
|
.quad .LCFI6-.Ltext0
|
|
|
|
|
.quad .LCFI7-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 16
|
|
|
|
|
.quad .LCFI7-.Ltext0
|
|
|
|
|
.quad .LCFI8-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x76
|
|
|
|
|
.sleb128 16
|
|
|
|
|
.quad .LCFI8-.Ltext0
|
|
|
|
|
.quad .LFE2-.Ltext0
|
|
|
|
|
.value 0x2
|
|
|
|
|
.byte 0x77
|
|
|
|
|
.sleb128 8
|
|
|
|
|
.quad 0
|
|
|
|
|
.quad 0
|
|
|
|
|
.section .debug_aranges,"",@progbits
|
|
|
|
|
.long 0x2c
|
|
|
|
|
.value 0x2
|
|
|
|
|
.long .Ldebug_info0
|
|
|
|
|
.byte 0x8
|
|
|
|
|
.byte 0
|
|
|
|
|
.value 0
|
|
|
|
|
.value 0
|
|
|
|
|
.quad .Ltext0
|
|
|
|
|
.quad .Letext0-.Ltext0
|
|
|
|
|
.quad 0
|
|
|
|
|
.quad 0
|
|
|
|
|
.section .debug_line,"",@progbits
|
|
|
|
|
.Ldebug_line0:
|
|
|
|
|
.section .debug_str,"MS",@progbits,1
|
|
|
|
|
.LASF0:
|
|
|
|
|
.string "stop_frame"
|
|
|
|
|
.LASF3:
|
|
|
|
|
.string "dw2-reg-undefined.c"
|
|
|
|
|
.LASF2:
|
|
|
|
|
.string "GNU C 4.7.2"
|
|
|
|
|
.LASF1:
|
|
|
|
|
.string "first_frame"
|
|
|
|
|
.LASF5:
|
|
|
|
|
.string "main"
|
|
|
|
|
.LASF4:
|
|
|
|
|
.string "/home/username/src/gdb/testsuite/gdb.dwarf2"
|
|
|
|
|
.ident "GCC: (GNU) 4.7.2"
|
|
|
|
|
.section .note.GNU-stack,"",@progbits
|
