Support for newer load commands

[jpstotz]

When I look into the source code the load command definitions seem to be a bit old, the latest LC is 0x30 where dyld already knows up to 0x34:
https://opensource.apple.com/source/cctools/cctools-927.0.2/include/mach-o/loader.h.auto.html

#define LC_NOTE 0x31 /* arbitrary data included within a Mach-O file */
#define LC_BUILD_VERSION 0x32 /* build for platform min OS version */
#define LC_DYLD_EXPORTS_TRIE (0x33 | LC_REQ_DYLD) /* used with linkedit_data_command, payload is trie */
#define LC_DYLD_CHAINED_FIXUPS (0x34 | LC_REQ_DYLD) /* used with linkedit_data_command */

The latter two replace starting with iOS15 LC_DYLD_INFO/LC_DYLD_INFO_ONLY
https://www.emergetools.com/blog/posts/iOS15LaunchTime

Sample app with LC_DYLD_EXPORTS_TRIE and LC_DYLD_CHAINED_FIXUPS:
nslogtest2.zip
e

[horsicq]

Thanks a lot for the report. I will take a look.

[horsicq]

I added the support. I will release a new verion of XMachOViewer in 2 weeks.

[vmpsoft]

The latest released version (0.04) still doesn't show contents of LC_DYLD_EXPORTS_TRIE and LC_DYLD_CHAINED_FIXUPS

[jpstotz]

Meanwhile Apple has added again two new load-commands:

LC_FILESET_ENTRY = 0x35;
LC_ATOM_INFO = 0x36;

[471595249]

The latest released version (0.04) still doesn't show contents of LC_VERSION_MIN_IPHONEOS.

[jpstotz]

Looking at the list of defined load-commands in https://github.com/horsicq/Formats/blob/master/xmach_def.h the following LCs are missing:

LC_SEGMENT_SPLIT_INFO = 0x1e
LC_REEXPORT_DYLIB = 0x1f
LC_DYLIB_CODE_SIGN_DRS = 0x2b
LC_FILESET_ENTRY = 0x35
LC_ATOM_INFO = 0x36

Not sure where the reverse lookup from constant to name is located. I have seen that for a lot of load commands there is code to handle them in machwidget.cpp. Is this the place where the load command parsing has to be implemented?
For generic load commands XMachOViewer does not parse the content it may be easier to have a lookup-table. That would avoid having to write an own if clause for each load command type.

[471595249]

Looking at the list of defined load-commands in https://github.com/horsicq/Formats/blob/master/xmach_def.h the following LCs are missing:

LC_SEGMENT_SPLIT_INFO = 0x1e
LC_REEXPORT_DYLIB = 0x1f
LC_DYLIB_CODE_SIGN_DRS = 0x2b
LC_FILESET_ENTRY = 0x35
LC_ATOM_INFO = 0x36

Not sure where the reverse lookup from constant to name is located. I have seen that for a lot of load commands there is code to handle them in machwidget.cpp. Is this the place where the load command parsing has to be implemented? For generic load commands XMachOViewer does not parse the content it may be easier to have a lookup-table. That would avoid having to write an own if clause for each load command type.

thanks! I got it!