Sign-extend start and stop address inputs to objdump
For targets that treat addresses as signed (MIPS/SH64), user-specified start/stop address limits cannot be compared directly to section VMAs. We must sign-extend user-specified 32-bit address limits which have bit 31 set for such targets. binutils/ * objdump.c (sign_extend_address): New function. (dump_bfd): Sign-extend user-specified start/stop addresses for targets that need it. * testsuite/binutils-all/objdump.exp: Add tests for objdump with start and stop addresses in higher address ranges.
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@ -1,3 +1,11 @@
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2019-05-08 Faraz Shahbazker <fshahbazker@wavecomp.com>
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* objdump.c (sign_extend_address): New function.
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(dump_bfd): Sign-extend user-specified start/stop addresses
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for targets that need it.
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* testsuite/binutils-all/objdump.exp: Add tests for objdump
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with start and stop addresses in higher address ranges.
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2019-05-01 Matthew Malcomson <matthew.malcomson@arm.com>
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* testsuite/binutils-all/objdump.exp: Correct executable
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@ -3749,11 +3749,25 @@ adjust_addresses (bfd *abfd ATTRIBUTE_UNUSED,
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}
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}
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/* Return the sign-extended form of an ARCH_SIZE sized VMA. */
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static bfd_vma
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sign_extend_address (bfd *abfd ATTRIBUTE_UNUSED,
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bfd_vma vma,
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unsigned arch_size)
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{
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bfd_vma mask;
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mask = (bfd_vma) 1 << (arch_size - 1);
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return (((vma & ((mask << 1) - 1)) ^ mask) - mask);
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}
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/* Dump selected contents of ABFD. */
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static void
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dump_bfd (bfd *abfd, bfd_boolean is_mainfile)
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{
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const struct elf_backend_data * bed;
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if (bfd_big_endian (abfd))
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byte_get = byte_get_big_endian;
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else if (bfd_little_endian (abfd))
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@ -3784,6 +3798,18 @@ dump_bfd (bfd *abfd, bfd_boolean is_mainfile)
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}
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}
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/* Adjust user-specified start and stop limits for targets that use
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signed addresses. */
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if (bfd_get_flavour (abfd) == bfd_target_elf_flavour
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&& (bed = get_elf_backend_data (abfd)) != NULL
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&& bed->sign_extend_vma)
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{
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start_address = sign_extend_address (abfd, start_address,
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bed->s->arch_size);
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stop_address = sign_extend_address (abfd, stop_address,
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bed->s->arch_size);
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}
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/* If we are adjusting section VMA's, change them all now. Changing
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the BFD information is a hack. However, we must do it, or
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bfd_find_nearest_line will not do the right thing. */
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@ -672,6 +672,60 @@ if {[is_elf_format]} then {
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test_follow_debuglink "--dwarf=follow-links --headers --wide" objdump.WK3
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}
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# Test objdump output with start and stop address limits for the specified
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# dump option
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proc test_objdump_limited { testfile dopt want start stop } {
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global OBJDUMP
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global OBJDUMPFLAGS
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set got [binutils_run $OBJDUMP "$OBJDUMPFLAGS $dopt --start-address 0x$start --stop-address 0x$stop $testfile"]
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if [regexp $want $got] then {
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pass "objdump $dopt --start-address 0x$start --stop-address 0x$stop ($testfile)"
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} else {
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fail "objdump $dopt --start-address 0x$start --stop-address 0x$stop ($testfile)"
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}
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}
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# Test objdump -d --start-address M --stop-address N
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proc test_objdump_disas_limited { testfile start stop } {
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set want "$testfile:\[ \]*file format.*Disassembly of section .text:\n.*\[ \]*$start:.*"
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test_objdump_limited $testfile -d $want $start $stop
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}
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# Test objdump -s --start-address M --stop-address N
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proc test_objdump_content_limited { testfile start stop } {
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set want "$testfile:\[ \]*file format.*Contents of section .text:\n\[ \]*$start .*"
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test_objdump_limited $testfile -s $want $start $stop
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}
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# Test objdump with --start-address and --stop-address options for higher
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# address ranges which may be sign-extended on targets that treat addresses
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# as signed. We only check that objdump produces some dump output at the
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# specified start address as a proxy for correct enforcement of the
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# start/stop limits.
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if {[is_elf_format]} then {
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# generate a copy of the test object with .text repositioned
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if { [binutils_run $OBJCOPY "--change-section-address .text=0x80000000 tmpdir/bintest.o tmpdir/bintest_signed.o"] != "" } {
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fail "Failed to reposition .text to 0x80000000 (tmpdir/bintest.o -> tmpdir/bintest_signed.o)"
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return
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}
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if [is_remote host] {
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set testfile3 [remote_download host tmpdir/bintest_signed.o]
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} else {
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set testfile3 tmpdir/bintest_signed.o
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}
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test_objdump_content_limited $testfile3 "80000004" "80000008"
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test_objdump_disas_limited $testfile3 "80000004" "80000008"
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remote_file host delete $testfile3
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}
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# Options which are not tested: -a -D -R -T -x -l --stabs
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# I don't see any generic way to test any of these other than -a.
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# Tests could be written for specific targets, and that should be done
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