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dwarf2: Pad size of .debug_line section.

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As all dwarf debug information is organized in octets, the size of all
dwarf sections must be aligned to OCTETS_PER_BYTE.  Most DWARF sections
meet this requirement, only the .debug_line section can reach an
arbitrary octet size.

In order to align the size to a multiple of OCTETS_PER_BYTE, the section
is padded with "nop" statements at the end.

	* dwarf2dbg.c (out_debug_line): Pad size of .debug_line section.
This commit is contained in:
Christian Eggers 2019-03-10 19:21:57 +01:00 committed by Alan Modra
parent 5c4e5fe61b
commit 145c4477d2
2 changed files with 15 additions and 0 deletions
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4
gas/ChangeLog
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@ -1,3 +1,7 @@
2019-03-13 Christian Eggers <ceggers@gmx.de>
* dwarf2dbg.c (out_debug_line): Pad size of .debug_line section.
2019-03-13 Christian Eggers <ceggers@gmx.de>
* dwarf2dbg.c (out_debug_str): Use octets for .debug_string pointers.

11
gas/dwarf2dbg.c
View File

@ -1787,6 +1787,7 @@ out_debug_line (segT line_seg)
symbolS *line_end;
struct line_seg *s;
int sizeof_offset;
addressT section_end, section_end_aligned;
memset (&exp, 0, sizeof exp);
sizeof_offset = out_header (line_seg, &exp);
@ -1848,6 +1849,16 @@ out_debug_line (segT line_seg)
in the DWARF Line Number header. */
subseg_set (subseg_get (".debug_line_end", FALSE), 0);
/* Pad size of .debug_line section to a multiple of OCTETS_PER_BYTE.
Simply sizing the section in md_section_align() is not sufficient,
also the size field in the .debug_line header must be a multiple
of OCTETS_PER_BYTE. Not doing so will introduce gaps within the
.debug_line sections after linking. */
section_end = frag_now_fix_octets ();
section_end_aligned = (section_end + OCTETS_PER_BYTE - 1) & -OCTETS_PER_BYTE;
for ( ; section_end != section_end_aligned; section_end++)
out_inc_line_addr (0, 0); /* NOP */
symbol_set_value_now_octets (line_end);
}