113 lines
3.1 KiB
Awk
113 lines
3.1 KiB
Awk
# This awk script expects to get command-line files that are each
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# the output of 'readelf -WSdr' on a single shared object, and named
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# .../NAME.jmprel where NAME is the unadorned file name of the shared object.
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# It writes "NAME: SYMBOL" for each PLT entry in NAME that refers to a
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# symbol defined in the same object.
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BEGIN { result = 0 }
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FILENAME != lastfile {
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if (lastfile && jmprel_offset == 0 && rela_offset == 0 && rel_offset == 0) {
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print FILENAME ": *** failed to find expected output (readelf -WSdr)";
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result = 2;
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}
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lastfile = FILENAME;
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jmprel_offset = 0;
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rela_offset = 0;
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rel_offset = 0;
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delete section_offset_by_address;
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}
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/^Section Headers:/ { in_shdrs = 1; next }
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in_shdrs && !/^ +\[/ { in_shdrs = 0 }
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in_shdrs && /^ +\[/ { sub(/\[ +/, "[") }
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in_shdrs {
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address = strtonum("0x" $4);
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offset = strtonum("0x" $5);
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section_offset_by_address[address] = offset;
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}
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in_shdrs { next }
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$1 == "Offset" && $2 == "Info" { in_relocs = 1; next }
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NF == 0 { in_relocs = 0 }
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in_relocs && relocs_offset == jmprel_offset && NF >= 5 {
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# Relocations against GNU_IFUNC symbols are not shown as an hexadecimal
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# value, but rather as the resolver symbol followed by ().
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if ($4 ~ /\(\)/) {
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print whatfile, gensub(/@.*/, "", "g", $5)
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} else {
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symval = strtonum("0x" $4);
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if (symval != 0)
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print whatfile, gensub(/@.*/, "", "g", $5)
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}
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}
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in_relocs && relocs_offset == rela_offset && NF >= 5 {
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# Relocations against GNU_IFUNC symbols are not shown as an hexadecimal
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# value, but rather as the resolver symbol followed by ().
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if ($4 ~ /\(\)/) {
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print whatfile, gensub(/@.*/, "", "g", $5), "RELA", $3
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} else {
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symval = strtonum("0x" $4);
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if (symval != 0)
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print whatfile, gensub(/@.*/, "", "g", $5), "RELA", $3
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}
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}
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in_relocs && relocs_offset == rel_offset && NF >= 5 {
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# Relocations against GNU_IFUNC symbols are not shown as an hexadecimal
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# value, but rather as the resolver symbol followed by ().
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if ($4 ~ /\(\)/) {
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print whatfile, gensub(/@.*/, "", "g", $5), "REL", $3
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} else {
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symval = strtonum("0x" $4);
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if (symval != 0)
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print whatfile, gensub(/@.*/, "", "g", $5), "REL", $3
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}
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}
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in_relocs { next }
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$1 == "Relocation" && $2 == "section" && $5 == "offset" {
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relocs_offset = strtonum($6);
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whatfile = gensub(/^.*\/([^/]+)\.jmprel$/, "\\1:", 1, FILENAME);
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next
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}
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$2 == "(JMPREL)" {
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jmprel_addr = strtonum($3);
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if (jmprel_addr in section_offset_by_address) {
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jmprel_offset = section_offset_by_address[jmprel_addr];
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} else {
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print FILENAME ": *** DT_JMPREL does not match any section's address";
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result = 2;
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}
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next
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}
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$2 == "(RELA)" {
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rela_addr = strtonum($3);
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if (rela_addr in section_offset_by_address) {
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rela_offset = section_offset_by_address[rela_addr];
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} else {
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print FILENAME ": *** DT_RELA does not match any section's address";
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result = 2;
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}
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next
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}
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$2 == "(REL)" {
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rel_addr = strtonum($3);
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if (rel_addr in section_offset_by_address) {
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rel_offset = section_offset_by_address[rel_addr];
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} else {
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print FILENAME ": *** DT_REL does not match any section's address";
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result = 2;
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}
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next
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}
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END { exit(result) }
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