objdump --no-addresses
Fangrui Song
i@maskray.me
Wed Apr 15 19:20:02 GMT 2020
On 2020-04-15, Alan Modra via Binutils wrote:
>I find this useful when needing to compare compiler output, where the
>address of the instruction and the value of symbols results in
>unwanted differences.
>
> * objdump.c (no_addresses): New static var.
> (usage): Print help for --no-addresses.
> (long_options): Add --no-addresses entry.
> (objdump_print_addr_with_sym, objdump_print_addr): Omit symbol address.
> (disassemble_bytes): Don't print current line address, or reloc
> address.
> * doc/binutils.texi: Document objdump --no-addresses.
>
>diff --git a/binutils/doc/binutils.texi b/binutils/doc/binutils.texi
>index de3f1babb2..b78154a8ef 100644
>--- a/binutils/doc/binutils.texi
>+++ b/binutils/doc/binutils.texi
>@@ -2161,6 +2161,7 @@ objdump [@option{-a}|@option{--archive-headers}]
> [@option{-w}|@option{--wide}]
> [@option{--start-address=}@var{address}]
> [@option{--stop-address=}@var{address}]
>+ [@option{--no-addresses}]
> [@option{--prefix-addresses}]
> [@option{--[no-]show-raw-insn}]
> [@option{--adjust-vma=}@var{offset}]
>@@ -2314,6 +2315,10 @@ Note if the @option{--dwarf=follow-links} option has also been enabled
> then any symbol tables in linked debug info files will be read in and
> used when disassembling.
>
>+@item --no-addresses
>+When disassembling, don't print addresses on each line or for symbols
>+and relocation offsets.
>+
> @item --prefix-addresses
> When disassembling, print the complete address on each line. This is
> the older disassembly format.
>diff --git a/binutils/objdump.c b/binutils/objdump.c
>index 81c0b4f3d0..1d9afec992 100644
>--- a/binutils/objdump.c
>+++ b/binutils/objdump.c
>@@ -93,6 +93,7 @@ static int dump_dynamic_reloc_info; /* -R */
> static int dump_ar_hdrs; /* -a */
> static int dump_private_headers; /* -p */
> static char *dump_private_options; /* -P */
>+static int no_addresses; /* --no-addresses */
> static int prefix_addresses; /* --prefix-addresses */
> static int with_line_numbers; /* -l */
> static bfd_boolean with_source_code; /* -S */
>@@ -270,6 +271,7 @@ usage (FILE *stream, int status)
> -z, --disassemble-zeroes Do not skip blocks of zeroes when disassembling\n\
> --start-address=ADDR Only process data whose address is >= ADDR\n\
> --stop-address=ADDR Only process data whose address is < ADDR\n\
>+ --no-addresses Do not print address alongside disassembly\n\
> --prefix-addresses Print complete address alongside disassembly\n\
> --[no-]show-raw-insn Display hex alongside symbolic disassembly\n\
> --insn-width=WIDTH Display WIDTH bytes on a single line for -d\n\
>@@ -358,6 +360,7 @@ static struct option long_options[]=
> {"info", no_argument, NULL, 'i'},
> {"line-numbers", no_argument, NULL, 'l'},
> {"no-show-raw-insn", no_argument, &show_raw_insn, -1},
>+ {"no-addresses", no_argument, &no_addresses, 1},
> {"prefix-addresses", no_argument, &prefix_addresses, 1},
> {"recurse-limit", no_argument, NULL, OPTION_RECURSE_LIMIT},
> {"recursion-limit", no_argument, NULL, OPTION_RECURSE_LIMIT},
>@@ -1303,13 +1306,17 @@ objdump_print_addr_with_sym (bfd *abfd, asection *sec, asymbol *sym,
> bfd_vma vma, struct disassemble_info *inf,
> bfd_boolean skip_zeroes)
> {
>- objdump_print_value (vma, inf, skip_zeroes);
>+ if (!no_addresses)
>+ {
>+ objdump_print_value (vma, inf, skip_zeroes);
>+ (*inf->fprintf_func) (inf->stream, " ");
>+ }
>
> if (sym == NULL)
> {
> bfd_vma secaddr;
>
>- (*inf->fprintf_func) (inf->stream, " <%s",
>+ (*inf->fprintf_func) (inf->stream, "<%s",
> sanitize_string (bfd_section_name (sec)));
> secaddr = bfd_section_vma (sec);
> if (vma < secaddr)
>@@ -1326,7 +1333,7 @@ objdump_print_addr_with_sym (bfd *abfd, asection *sec, asymbol *sym,
> }
> else
> {
>- (*inf->fprintf_func) (inf->stream, " <");
>+ (*inf->fprintf_func) (inf->stream, "<");
>
> objdump_print_symname (abfd, inf, sym);
>
>@@ -1376,8 +1383,11 @@ objdump_print_addr (bfd_vma vma,
>
> if (sorted_symcount < 1)
> {
>- (*inf->fprintf_func) (inf->stream, "0x");
>- objdump_print_value (vma, inf, skip_zeroes);
>+ if (!no_addresses)
>+ {
>+ (*inf->fprintf_func) (inf->stream, "0x");
>+ objdump_print_value (vma, inf, skip_zeroes);
>+ }
>
> if (display_file_offsets)
> inf->fprintf_func (inf->stream, _(" (File Offset: 0x%lx)"),
>@@ -2573,7 +2583,7 @@ disassemble_bytes (struct disassemble_info * inf,
> zeroes in chunks of 4, ensuring that there is always a leading
> zero remaining. */
> skip_addr_chars = 0;
>- if (! prefix_addresses)
>+ if (!no_addresses && !prefix_addresses)
> {
> char buf[30];
>
>@@ -2669,7 +2679,9 @@ disassemble_bytes (struct disassemble_info * inf,
> if (with_line_numbers || with_source_code)
> show_line (aux->abfd, section, addr_offset);
>
>- if (! prefix_addresses)
>+ if (no_addresses)
>+ printf ("\t");
>+ else if (!prefix_addresses)
> {
> char *s;
>
>@@ -2875,12 +2887,17 @@ disassemble_bytes (struct disassemble_info * inf,
> putchar ('\n');
> j = addr_offset * opb + pb;
>
>- bfd_sprintf_vma (aux->abfd, buf, section->vma + j / opb);
>- for (s = buf + skip_addr_chars; *s == '0'; s++)
>- *s = ' ';
>- if (*s == '\0')
>- *--s = '0';
>- printf ("%s:\t", buf + skip_addr_chars);
>+ if (no_addresses)
>+ printf ("\t");
>+ else
>+ {
>+ bfd_sprintf_vma (aux->abfd, buf, section->vma + j / opb);
>+ for (s = buf + skip_addr_chars; *s == '0'; s++)
>+ *s = ' ';
>+ if (*s == '\0')
>+ *--s = '0';
>+ printf ("%s:\t", buf + skip_addr_chars);
>+ }
>
> print_jump_visualisation (section->vma + j / opb,
> max_level, line_buffer,
>@@ -2932,15 +2949,19 @@ disassemble_bytes (struct disassemble_info * inf,
> else
> printf ("\t\t\t");
>
>- objdump_print_value (section->vma - rel_offset + q->address,
>- inf, TRUE);
>+ if (!no_addresses)
>+ {
>+ objdump_print_value (section->vma - rel_offset + q->address,
>+ inf, TRUE);
>+ printf (": ");
>+ }
>
> if (q->howto == NULL)
>- printf (": *unknown*\t");
>+ printf ("*unknown*\t");
> else if (q->howto->name)
>- printf (": %s\t", q->howto->name);
>+ printf ("%s\t", q->howto->name);
> else
>- printf (": %d\t", q->howto->type);
>+ printf ("%d\t", q->howto->type);
>
> if (q->sym_ptr_ptr == NULL || *q->sym_ptr_ptr == NULL)
> printf ("*unknown*");
>
>--
>Alan Modra
>Australia Development Lab, IBM
Also hope we can have some tests here
Here is an example
https://github.com/llvm/llvm-project/blob/master/llvm/test/tools/llvm-objdump/X86/print-symbol-addr.s
For GNU objdump, I hope dejagnu could achieve something like:
objdump -d %t.32.o | FileCheck --check-prefixes=ADDR32,ADDR %s
objdump -d %t.64.o | FileCheck --check-prefixes=ADDR64,ADDR %s
objdump -d --no-leading-addr %t.64.o | FileCheck --check-prefixes=NOADDR %s
This should make it clear the effect of the new option.
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