Using A Dll Registry - HP eld Manual

eld Input and Output
Note that this is a DLL registry under the user's control, not the "public DLL registry"
covered in Finding and Reading The Public DLL Registry (ZREG) File
If the -t option is not specified, and no DLL registry is specified, the DLL is placed at
the address 0x78000000.
If the -d option is not used, the data (constant) segment of a DLL is placed
immediately after the text segment at a 64KB boundary if it isn't an implicit DLL, or
128KB if it is an implicit DLL. The -d option may be used to tell where the data
(constant) segment starts.
without the -t option.
The two segment addresses for a program are always specified independently, with
the -t and -d options. The default value for -t is 0x70000000, and the default
value for -d is 0x08000000.
Note: In general, the -d option should not be used, because it will result in the
creation of a file that the operating system will refuse to load.
The values specified for the -t and -d options are rounded up, if necessary to a
multiple of 128KB for an implicit DLL, or 64KB for other types of loadfiles. If rounding
up is necessary, a warning message is produced.
reports an error if you specify the -t or -d option with -r.
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Using a DLL Registry

The linker uses a DLL registry to manage DLL addresses so that the virtual addresses
of some or all of the DLLs being managed by a given registry do not overlap. Note that
this is a DLL registry managed by the individual user, not the "public" DLL registry
covered in Finding and Reading The Public DLL Registry (ZREG) File
The linker can pick addresses on its own, or the registry can be modified by hand to tell
the linker what to do.
The -check_registry and -update_registry options tell the linker which
registry to use.
•
The -check_registry option is used to tell the linker how the DLL must be
built, giving it no choice.
•
The -update_registry option can make suggestions to the linker, but the
linker still has decisions to make, and the registry is updated as a result. If
neither option is used, the linker does not use a registry.
•
reports an error if these options are used when the linker is not building a
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DLL.
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the -check_registry or -update_registry option is used with the -t
or -d option.
When a DLL registry is used the linker lays out data segment(s) of the DLL
immediately after the text segment, at a 64KB boundary if it isn't an implicit DLL, or at a
128KB boundary if it is an implicit DLL.
reports an error if you specify the -d option for a DLL
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reports an error if both options are used.
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Using a DLL Registry
on page 3-23.
on page 3-23.
reports an error if either