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https://sourceware.org/git/binutils-gdb.git
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Update readelf's and objdump's debug frame displaying feature to include the contents of the .eh_frame_hdr section, if present.
This commit is contained in:
Nick Clifton
parent
8d10083c23
commit
1878f44b70
@ -1,5 +1,9 @@
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-*- text -*-
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* When objdump or readelf are used to display the contents of a .eh_frame
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section they will now also display the contents of the .eh_frame_hdr section,
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if present.
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Changes in 2.42:
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* The objdump program has a new command line option -Z/--decompress which
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260
binutils/dwarf.c
260
binutils/dwarf.c
@ -9160,6 +9160,265 @@ display_augmentation_data (const unsigned char * data, uint64_t len)
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display_data (i, data, len);
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}
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static const char *
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decode_eh_encoding (unsigned int value)
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{
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if (value == DW_EH_PE_omit)
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return "omit";
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char * format;
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switch (value & 0x0f)
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{
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case DW_EH_PE_uleb128: format = "uleb128"; break;
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case DW_EH_PE_udata2: format = "udata2"; break;
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case DW_EH_PE_udata4: format = "udata4"; break;
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case DW_EH_PE_udata8: format = "udata8"; break;
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case DW_EH_PE_sleb128: format = "sleb128"; break;
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case DW_EH_PE_sdata2: format = "sdata2"; break;
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case DW_EH_PE_sdata4: format = "sdata4"; break;
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case DW_EH_PE_sdata8: format = "sdata8"; break;
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default: format = "<unknown format>"; break; /* FIXME: Generate a warning ? */
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}
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char * application;
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switch (value & 0xf0)
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{
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case DW_EH_PE_absptr: application = "absolute"; break;
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case DW_EH_PE_pcrel: application = "pcrel"; break;
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case DW_EH_PE_textrel: application = "textrel"; break; /* FIXME: Is this allowed ? */
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case DW_EH_PE_datarel: application = "datarel"; break;
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case DW_EH_PE_funcrel: application = "funcrel"; break; /* FIXME: Is this allowed ? */
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case DW_EH_PE_aligned: application = "aligned"; break; /* FIXME: Is this allowed ? */
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case DW_EH_PE_indirect: application = "indirect"; break; /* FIXME: Is this allowed ? */
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default: application = "<unknown application method>"; break; /* FIXME: Generate a warning ? */
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}
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static char buffer[128];
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sprintf (buffer, "%s, %s", format, application);
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return buffer;
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}
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/* Reads a value stored at START encoded according to ENCODING.
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Does not read from, or past, END.
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Upon success, returns the read value and sets * RETURN_LEN to
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the number of bytes read.
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Upon failure returns zero and sets * RETURN_LEN to 0.
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Note: does not perform any application transformations to the value. */
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static uint64_t
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get_encoded_eh_value (unsigned int encoding,
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unsigned char * start,
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unsigned char * end,
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unsigned int * return_len)
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{
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uint64_t val;
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unsigned int len;
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int status;
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unsigned char * old_start;
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switch (encoding & 0x0f)
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{
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case DW_EH_PE_uleb128:
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val = read_leb128 (start, end, false, & len, & status);
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if (status != 0)
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len = 0;
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break;
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case DW_EH_PE_sleb128:
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val = read_leb128 (start, end, true, & len, & status);
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if (status != 0)
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len = 0;
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break;
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case DW_EH_PE_udata2:
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old_start = start;
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SAFE_BYTE_GET_AND_INC (val, start, 2, end);
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len = (start == old_start) ? 0 : 2;
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break;
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case DW_EH_PE_udata4:
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old_start = start;
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SAFE_BYTE_GET_AND_INC (val, start, 4, end);
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len = (start == old_start) ? 0 : 4;
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break;
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case DW_EH_PE_udata8:
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old_start = start;
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SAFE_BYTE_GET_AND_INC (val, start, 8, end);
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len = (start == old_start) ? 0 : 8;
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break;
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case DW_EH_PE_sdata2:
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old_start = start;
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SAFE_SIGNED_BYTE_GET_AND_INC (val, start, 2, end);
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len = (start == old_start) ? 0 : 2;
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break;
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case DW_EH_PE_sdata4:
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old_start = start;
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SAFE_SIGNED_BYTE_GET_AND_INC (val, start, 4, end);
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len = (start == old_start) ? 0 : 4;
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break;
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case DW_EH_PE_sdata8:
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old_start = start;
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SAFE_SIGNED_BYTE_GET_AND_INC (val, start, 8, end);
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len = (start == old_start) ? 0 : 8;
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break;
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default:
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goto fail;
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}
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* return_len = len;
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return val;
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fail:
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* return_len = 0;
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return 0;
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}
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static uint64_t
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encoded_eh_offset (unsigned int encoding,
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struct dwarf_section * section,
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uint64_t section_offset,
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uint64_t value)
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{
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switch (encoding & 0xf0)
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{
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default:
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/* This should not happen. FIXME: warn ? */
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case DW_EH_PE_absptr:
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return value;
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case DW_EH_PE_pcrel:
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return value + (uint64_t)(section->address + section_offset);
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case DW_EH_PE_datarel:
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return value + (uint64_t)section->address;
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}
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}
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static int
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display_eh_frame_hdr (struct dwarf_section *section,
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void *file ATTRIBUTE_UNUSED)
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{
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unsigned char *start = section->start;
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unsigned char *end = start + section->size;
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introduce (section, false);
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if (section->size < 6)
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{
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warn (_(".eh_frame_hdr section is too small\n"));
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return 0;
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}
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unsigned int version = start[0];
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if (version != 1)
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{
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warn (_("Unsupported .eh_frame_hdr version %u\n"), version);
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return 0;
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}
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printf (_(" Version: %u\n"), version);
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unsigned int ptr_enc = start[1];
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/* Strictly speaking this is the encoding format of the eh_frame_ptr field below. */
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printf (_(" Pointer Encoding Format: %#x (%s)\n"), ptr_enc, decode_eh_encoding (ptr_enc));
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unsigned int count_enc = start[2];
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printf (_(" Count Encoding Format: %#x (%s)\n"), count_enc, decode_eh_encoding (count_enc));
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unsigned int table_enc = start[3];
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printf (_(" Table Encoding Format: %#x (%s)\n"), table_enc, decode_eh_encoding (table_enc));
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start += 4;
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unsigned int len;
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uint64_t eh_frame_ptr = get_encoded_eh_value (ptr_enc, start, end, & len);
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if (len == 0)
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{
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warn (_("unable to read eh_frame_ptr field in .eh_frame_hdr section\n"));
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return 0;
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}
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printf (_(" Start of frame section: %#" PRIx64), eh_frame_ptr);
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uint64_t offset_eh_frame_ptr = encoded_eh_offset (ptr_enc, section, 4, eh_frame_ptr);
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if (offset_eh_frame_ptr != eh_frame_ptr)
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printf (_(" (offset: %#" PRIx64 ")"), offset_eh_frame_ptr);
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printf ("\n");
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start += len;
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if (count_enc == DW_EH_PE_omit)
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{
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warn (_("It is suspicious to have a .eh_frame_hdr section with an empty search table\n"));
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return 0;
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}
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if (count_enc & 0xf0)
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{
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warn (_("The count field format should be absolute, not relative to an address\n"));
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return 0;
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}
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uint64_t fde_count = get_encoded_eh_value (count_enc, start, end, & len);
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if (len == 0)
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{
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warn (_("unable to read fde_count field in .eh_frame_hdr section\n"));
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return 0;
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}
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printf (_(" Entries in search table: %#" PRIx64), fde_count);
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printf ("\n");
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start += len;
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if (fde_count != 0 && table_enc == DW_EH_PE_omit)
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{
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warn (_("It is suspicious to have a .eh_frame_hdr section an empty table but a non empty count field\n"));
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return 0;
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}
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uint64_t i;
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/* Read and display the search table. */
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for (i = 0; i < fde_count; i++)
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{
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uint64_t location, address;
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unsigned char * row_start = start;
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location = get_encoded_eh_value (table_enc, start, end, & len);
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if (len == 0)
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{
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warn (_("Failed to read location field for entry %#" PRIx64 " in the .eh_frame_hdr's search table\n"), i);
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return 0;
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}
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start += len;
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address = get_encoded_eh_value (table_enc, start, end, & len);
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if (len == 0)
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{
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warn (_("Failed to read address field for entry %#" PRIx64 " in the .eh_frame_hdr's search table\n"), i);
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return 0;
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}
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start += len;
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/* This format is intended to be compatible with the output of eu-readelf's -e option. */
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printf (" %#" PRIx64 " (offset: %#" PRIx64 ") -> %#" PRIx64 " fde=[ %5" PRIx64 "]\n",
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location,
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encoded_eh_offset (table_enc, section, row_start - section->start, location),
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address,
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encoded_eh_offset (table_enc, section, row_start - section->start, address) - offset_eh_frame_ptr);
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}
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printf ("\n");
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return 1;
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}
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static int
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display_debug_frames (struct dwarf_section *section,
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void *file ATTRIBUTE_UNUSED)
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@ -12472,6 +12731,7 @@ struct dwarf_section_display debug_displays[] =
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{ { ".debug_pubnames", ".zdebug_pubnames", ".dwpbnms", NO_ABBREVS }, display_debug_pubnames, &do_debug_pubnames, false },
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{ { ".debug_gnu_pubnames", ".zdebug_gnu_pubnames", "", NO_ABBREVS }, display_debug_gnu_pubnames, &do_debug_pubnames, false },
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{ { ".eh_frame", "", "", NO_ABBREVS }, display_debug_frames, &do_debug_frames, true },
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{ { ".eh_frame_hdr", "", "", NO_ABBREVS }, display_eh_frame_hdr, &do_debug_frames, true },
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{ { ".debug_macinfo", ".zdebug_macinfo", "", NO_ABBREVS }, display_debug_macinfo, &do_debug_macinfo, false },
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{ { ".debug_macro", ".zdebug_macro", ".dwmac", NO_ABBREVS }, display_debug_macro, &do_debug_macinfo, true },
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{ { ".debug_str", ".zdebug_str", ".dwstr", NO_ABBREVS }, display_debug_str, &do_debug_str, false },
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@ -83,6 +83,7 @@ enum dwarf_section_display_enum
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pubnames,
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gnu_pubnames,
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eh_frame,
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eh_frame_hdr,
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macinfo,
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macro,
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str,
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@ -7888,6 +7888,8 @@ process_section_headers (Filedata * filedata)
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request_dump_bynumber (&filedata->dump, i, DEBUG_DUMP);
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else if (do_debug_frames && streq (name, ".eh_frame"))
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request_dump_bynumber (&filedata->dump, i, DEBUG_DUMP);
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else if (do_debug_frames && streq (name, ".eh_frame_hdr"))
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request_dump_bynumber (&filedata->dump, i, DEBUG_DUMP);
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else if (do_gdb_index && (streq (name, ".gdb_index")
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|| streq (name, ".debug_names")))
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request_dump_bynumber (&filedata->dump, i, DEBUG_DUMP);
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