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xcoff.c: Initial support for DWARF debug sections in XCOFF.

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* xcoff.c: Initial support for DWARF debug sections in XCOFF.
	(STYP_DWARF, SSUBTYP_DW*): Define.
	(enum dwarf_section): Define.
	(struct dwsect_info): Define.
	(xcoff_add): Look for DWARF sections, pass them to
	backtrace_dwarf_add.

From-SVN: r253297
This commit is contained in:
Tony Reix 2017-09-29 16:37:39 +00:00 committed by Ian Lance Taylor
parent a815fe4457
commit e90c74f598
2 changed files with 142 additions and 11 deletions
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9
libbacktrace/ChangeLog
View File

@ -1,3 +1,12 @@
2017-09-29 Tony Reix <tony.reix@atos.net>
* xcoff.c: Initial support for DWARF debug sections in XCOFF.
(STYP_DWARF, SSUBTYP_DW*): Define.
(enum dwarf_section): Define.
(struct dwsect_info): Define.
(xcoff_add): Look for DWARF sections, pass them to
backtrace_dwarf_add.
2017-09-28 Ian Lance Taylor <iant@golang.org>
PR other/67165

144
libbacktrace/xcoff.c
View File

@ -124,9 +124,16 @@ typedef struct {
#endif /* BACKTRACE_XCOFF_SIZE != 32 */
#define STYP_DWARF 0x10 /* DWARF debugging section. */
#define STYP_TEXT 0x20 /* Executable text (code) section. */
#define STYP_OVRFLO 0x8000 /* Line-number field overflow section. */
#define SSUBTYP_DWINFO 0x10000 /* DWARF info section. */
#define SSUBTYP_DWLINE 0x20000 /* DWARF line-number section. */
#define SSUBTYP_DWARNGE 0x50000 /* DWARF aranges section. */
#define SSUBTYP_DWABREV 0x60000 /* DWARF abbreviation section. */
#define SSUBTYP_DWSTR 0x70000 /* DWARF strings section. */
/* XCOFF symbol. */
#define SYMNMLEN 8
@ -367,6 +374,29 @@ struct xcoff_fileline_data
struct xcoff_line_vector vec;
};
/* An index of DWARF sections we care about. */
enum dwarf_section
{
DWSECT_INFO,
DWSECT_LINE,
DWSECT_ABBREV,
DWSECT_RANGES,
DWSECT_STR,
DWSECT_MAX
};
/* Information we gather for the DWARF sections we care about. */
struct dwsect_info
{
/* Section file offset. */
off_t offset;
/* Section size. */
size_t size;
/* Section contents, after read from file. */
const unsigned char *data;
};
/* A dummy callback function used when we can't find any debug info. */
@ -1056,12 +1086,16 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
struct backtrace_view linenos_view;
struct backtrace_view syms_view;
struct backtrace_view str_view;
struct backtrace_view dwarf_view;
b_xcoff_filhdr fhdr;
const b_xcoff_scnhdr *sects;
const b_xcoff_scnhdr *stext;
uint64_t lnnoptr;
uint32_t nlnno;
off_t str_off;
off_t min_offset;
off_t max_offset;
struct dwsect_info dwsect[DWSECT_MAX];
size_t sects_size;
size_t syms_size;
int32_t str_size;
@ -1069,6 +1103,7 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
int linenos_view_valid;
int syms_view_valid;
int str_view_valid;
int dwarf_view_valid;
int magic_ok;
int i;
@ -1078,6 +1113,9 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
linenos_view_valid = 0;
syms_view_valid = 0;
str_view_valid = 0;
dwarf_view_valid = 0;
str_size = 0;
/* Map the XCOFF file header. */
if (!backtrace_get_view (state, descriptor, offset, sizeof (b_xcoff_filhdr),
@ -1092,7 +1130,7 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
if (!magic_ok)
{
if (exe)
error_callback (data, "executable file is not XCOFF", 0);
error_callback (data, "executable file is not XCOFF", 0);
goto fail;
}
@ -1114,8 +1152,8 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
/* FIXME: assumes only one .text section. */
for (i = 0; i < fhdr.f_nscns; ++i)
if ((sects[i].s_flags & 0xffff) == STYP_TEXT)
break;
if ((sects[i].s_flags & 0xffff) == STYP_TEXT)
break;
if (i == fhdr.f_nscns)
goto fail;
@ -1134,12 +1172,12 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
/* Find the matching .ovrflo section. */
for (i = 0; i < fhdr.f_nscns; ++i)
{
if (((sects[i].s_flags & 0xffff) == STYP_OVRFLO)
&& sects[i].s_nlnno == sntext)
{
nlnno = sects[i].s_vaddr;
break;
}
if (((sects[i].s_flags & 0xffff) == STYP_OVRFLO)
&& sects[i].s_nlnno == sntext)
{
nlnno = sects[i].s_vaddr;
break;
}
}
}
#endif
@ -1194,9 +1232,91 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
xcoff_add_syminfo_data (state, sdata);
}
/* Read the line number entries. */
/* Read all the DWARF sections in a single view, since they are
probably adjacent in the file. We never release this view. */
if (fhdr.f_symptr != 0 && lnnoptr != 0)
min_offset = 0;
max_offset = 0;
memset (dwsect, 0, sizeof dwsect);
for (i = 0; i < fhdr.f_nscns; ++i)
{
off_t end;
int idx;
if ((sects[i].s_flags & 0xffff) != STYP_DWARF
|| sects[i].s_size == 0)
continue;
/* Map DWARF section to array index. */
switch (sects[i].s_flags & 0xffff0000)
{
case SSUBTYP_DWINFO:
idx = DWSECT_INFO;
break;
case SSUBTYP_DWLINE:
idx = DWSECT_LINE;
break;
case SSUBTYP_DWABREV:
idx = DWSECT_ABBREV;
break;
case SSUBTYP_DWARNGE:
idx = DWSECT_RANGES;
break;
case SSUBTYP_DWSTR:
idx = DWSECT_STR;
break;
default:
continue;
}
if (min_offset == 0 || (off_t) sects[i].s_scnptr < min_offset)
min_offset = sects[i].s_scnptr;
end = sects[i].s_scnptr + sects[i].s_size;
if (end > max_offset)
max_offset = end;
dwsect[idx].offset = sects[i].s_scnptr;
dwsect[idx].size = sects[i].s_size;
}
if (min_offset != 0 && max_offset != 0)
{
if (!backtrace_get_view (state, descriptor, offset + min_offset,
max_offset - min_offset,
error_callback, data, &dwarf_view))
goto fail;
dwarf_view_valid = 1;
for (i = 0; i < (int) DWSECT_MAX; ++i)
{
if (dwsect[i].offset == 0)
dwsect[i].data = NULL;
else
dwsect[i].data = ((const unsigned char *) dwarf_view.data
+ (dwsect[i].offset - min_offset));
}
if (!backtrace_dwarf_add (state, 0,
dwsect[DWSECT_INFO].data,
dwsect[DWSECT_INFO].size,
#if BACKTRACE_XCOFF_SIZE == 32
/* XXX workaround for broken lineoff */
dwsect[DWSECT_LINE].data - 4,
#else
/* XXX workaround for broken lineoff */
dwsect[DWSECT_LINE].data - 12,
#endif
dwsect[DWSECT_LINE].size,
dwsect[DWSECT_ABBREV].data,
dwsect[DWSECT_ABBREV].size,
dwsect[DWSECT_RANGES].data,
dwsect[DWSECT_RANGES].size,
dwsect[DWSECT_STR].data,
dwsect[DWSECT_STR].size,
1, /* big endian */
error_callback, data, fileline_fn))
goto fail;
}
/* Read the XCOFF line number entries if DWARF sections not found. */
if (!dwarf_view_valid && fhdr.f_symptr != 0 && lnnoptr != 0)
{
size_t linenos_size = (size_t) nlnno * LINESZ;
@ -1239,6 +1359,8 @@ xcoff_add (struct backtrace_state *state, int descriptor, off_t offset,
backtrace_release_view (state, &syms_view, error_callback, data);
if (linenos_view_valid)
backtrace_release_view (state, &linenos_view, error_callback, data);
if (dwarf_view_valid)
backtrace_release_view (state, &dwarf_view, error_callback, data);
if (descriptor != -1 && offset == 0)
backtrace_close (descriptor, error_callback, data);
return 0;