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synced 2026-07-10 13:29:52 -04:00
e62ac0d2c6
add a plugin_ram_end symbol to plugin.lds and rewrite ovl_offset.pl to read plugin_ram_end and plugin_load_end_addr from the elf via nm. this removes all dependence on the linker map file format, which differs between gnu ld and lld. Change-Id: I66e623d9a2b44eb84ae7035155c84d8afe46df23
39 lines
1.3 KiB
Perl
Executable file
39 lines
1.3 KiB
Perl
Executable file
#!/usr/bin/perl
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# Calculate the highest possible location for an overlay based
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# on a reference ELF file (.refelf)
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# Reads plugin_load_end_addr and plugin_ram_end symbols from the ELF
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# via nm, then computes the overlay offset.
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sub main {
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# The buflib handle table is a few hundred bytes, just before
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# the plugin buffer. We assume it's never more than 1024 bytes.
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# If this assumption is wrong, overlay loading will fail.
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my $max_handle_table_size = 1024;
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my ($elf) = @_;
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my $ram_end = -1;
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my $load_end = -1;
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open (NM, "nm $elf |") or die "Cannot run nm on $elf: $!\n";
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while (<NM>) {
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if ($_ =~ /^([0-9a-fA-F]+)\s+\S+\s+plugin_ram_end$/) {
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$ram_end = hex($1);
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}
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elsif ($_ =~ /^([0-9a-fA-F]+)\s+\S+\s+plugin_load_end_addr$/) {
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$load_end = hex($1);
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}
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}
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close(NM);
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if ($ram_end < 0 || $load_end < 0) {
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printf STDERR "Could not read symbols from $elf\n";
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printf STDERR " plugin_ram_end: %s\n", $ram_end < 0 ? "not found" : sprintf("0x%x", $ram_end);
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printf STDERR " plugin_load_end_addr: %s\n", $load_end < 0 ? "not found" : sprintf("0x%x", $load_end);
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exit 1;
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}
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return ($ram_end - $load_end - $max_handle_table_size) & ~0xf;
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}
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printf main($ARGV[0]);
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