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* dwarf2-frame.c (struct dwarf2_cie): Add signal_frame field.

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(dwarf2_frame_sniffer): Use it.
(decode_frame_entry_1): Set it according to augmentation "S".
This commit is contained in:
Alexandre Oliva 2006-05-28 05:56:20 +00:00
parent f8fdc85041
commit 56c987f606
2 changed files with 29 additions and 3 deletions
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6
gdb/ChangeLog
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@ -1,3 +1,9 @@
2006-05-28 Alexandre Oliva <aoliva@redhat.com>
* dwarf2-frame.c (struct dwarf2_cie): Add signal_frame field.
(dwarf2_frame_sniffer): Use it.
(decode_frame_entry_1): Set it according to augmentation "S".
2006-05-27 Joel Brobecker <brobecker@adacore.com>
From Peter Schauer <peterschauer@gmx.net>

26
gdb/dwarf2-frame.c
View file

@ -70,6 +70,9 @@ struct dwarf2_cie
/* True if a 'z' augmentation existed. */
unsigned char saw_z_augmentation;
/* True if an 'S' augmentation existed. */
unsigned char signal_frame;
struct dwarf2_cie *next;
};
@ -1053,15 +1056,17 @@ dwarf2_frame_sniffer (struct frame_info *next_frame)
function. frame_pc_unwind(), for a no-return next function, can
end up returning something past the end of this function's body. */
CORE_ADDR block_addr = frame_unwind_address_in_block (next_frame);
if (!dwarf2_frame_find_fde (&block_addr))
struct dwarf2_fde *fde = dwarf2_frame_find_fde (&block_addr);
if (!fde)
return NULL;
/* On some targets, signal trampolines may have unwind information.
We need to recognize them so that we set the frame type
correctly. */
if (dwarf2_frame_signal_frame_p (get_frame_arch (next_frame),
next_frame))
if (fde->cie->signal_frame
|| dwarf2_frame_signal_frame_p (get_frame_arch (next_frame),
next_frame))
return &dwarf2_signal_frame_unwind;
return &dwarf2_frame_unwind;
@ -1521,6 +1526,10 @@ decode_frame_entry_1 (struct comp_unit *unit, gdb_byte *start, int eh_frame_p)
depends on the target address size. */
cie->encoding = DW_EH_PE_absptr;
/* We'll determine the final value later, but we need to
initialize it conservatively. */
cie->signal_frame = 0;
/* Check version number. */
cie_version = read_1_byte (unit->abfd, buf);
if (cie_version != 1 && cie_version != 3)
@ -1604,6 +1613,17 @@ decode_frame_entry_1 (struct comp_unit *unit, gdb_byte *start, int eh_frame_p)
augmentation++;
}
/* "S" indicates a signal frame, such that the return
address must not be decremented to locate the call frame
info for the previous frame; it might even be the first
instruction of a function, so decrementing it would take
us to a different function. */
else if (*augmentation == 'S')
{
cie->signal_frame = 1;
augmentation++;
}
/* Otherwise we have an unknown augmentation.
Bail out unless we saw a 'z' prefix. */
else