SEG_ADDR_TABLE
Section: Misc. Reference Manual Pages (l)
Updated: June 21, 2000
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NAME
seg_addr_table - re-layout, update or check a segment address table
SYNOPSIS
seg_addr_table [operation] [options] [-o output_file]
DESCRIPTION
seg_addr_table
re-lays out, updates or checks a segment address table. If it can do its
operation with out problems
seg_addr_table(l)
exits with zero status. Else it exits with a non-zero status and prints an
error message about the problem.
The Apple Build and Integration team uses the segment address table in
/AppleInternal/Developer/seg_addr_table to set the preferred addresses of
dynamic libraries. See the
ld(1)
man page under the
-seg_addr_table
option and its environment variable
LD_SEG_ADDR_TABLE.
The format of segment address table are lines of three forms.
The entries in the table are lines containing either a single hex address and an
install name or two hex addresses and an install name. In the first form the
single hex address is used for ``flat'' libraries and is the
-seg1addr.
In the second form is used for ``split'' libraries and the first address is
the
-segs_read_only_addr
address and the second is the
-segs_read_write_addr
address.
The third form is used for fixed regions that are not to be allocated. They
have a hex addresses and a hex size and the literal string
<<< Fixed address and size not to assign >>>.
Lines starting with the # character are treated as comments.
The output table of
seg_addr_table(l)
also contains two special entries. One for the next addresses to assign
``flat'' libraries and one for the next addresses to assign to ``split''
libraries. Comments are generated before these entries stating they must not
be removed.
The following option must be specified when using the
-relayout
or
-update
options:
- -o output_file
-
Write the new segment address table to
output_file.
One of the following operations must be specified:
- -relayout
-
This causes the entire table to be re-laied out and all dynamic libraries to
be assigned addresses. The address are assigned in the order specified and
the space given to each is based on the libraries virtual address sizes.
- -update
-
Only entries with zero address values are assigned addresses. The address
assignment is based on the special entries in the table for the next addresses
to assign.
- -update_overlaps
-
Detects overlaps in the table and reassigns the lower of the two addresses. The address
assignment is based on the special entries in the table for the next addresses
to assign. This action is similar to detecting overlaps with -checkonly, setting
the overlapping library to 0x00000000 and running with -update.
- -checkonly
-
This option only checks the entries in the table for overlaps.
The following options may be specified with any of the operations:
- -seg_addr_table filename
-
This is the input segment address table. If not specified the default is
/AppleInternal/Developer/seg_addr_table.
- -release release_name
-
For each ``flat'' entry in the table try finding and using the dynamic library
from the
$(SYMROOT)
from the specified
release_name
to base the size of the library on.
If the file in not found in the
$(SYMROOT)
or it is a ``split'' entry then use the dynamic library in the
$(DSTROOT)
from the specified
release_name
to base the size of the library on.
Without this option the library with the install name on the machine running
is used. With this option the library with the install name on the machine
running is never used.
The following options may be specified with the
-relayout
operation:
- -seg1addr addr
-
Specifies the starting address to layout ``flat'' libraries.
addr
is a hexadecimal number and should be a multiple of the target pagesize.
The default if not specified is 0x41300000.
- -segs_read_only_addr addr
-
Specifies the starting address to layout the read-only segments of ``split''
libraries.
addr
is a hexadecimal number and should be a multiple of the target pagesize.
The default if not specified is 0x20000000.
- -segs_read_write_addr addr
-
Specifies the starting address to layout the read-write segments of ``split''
libraries.
addr
is a hexadecimal number and should be a multiple of the target pagesize.
The default if not specified is 0x30000000.
The following options may be specified with any operation:
- -disablewarnings
-
This option disables a small number of warnings which is useful for B&I when
running the
-update
operation and there are entries in the table that have problems. These entries
are then removed from the table when creating the output.
- -arch arch_type
-
Specifies the architecture,
arch_type,
in the files to use for the sizes. More than one
-arch arch_type
can be specified. The default is
-arch all
which uses all architectures in the file. See
arch(3)
for the currently known
arch_types.
SEE ALSO
ld(1)
Index
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-
- SYNOPSIS
-
- DESCRIPTION
-
- SEE ALSO
-
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