SPRUI03E June 2015 – January 2023
The linker creates and allocates a separate input section for each copy table that it generates. Each copy table symbol is defined with the address value of the input section that contains the corresponding copy table.
The linker generates a unique name for each overlay copy table input section. For example, table(_first_ctbl) would place the copy table for the .first section into an input section called .ovly:_first_ctbl. The linker creates a single input section, .binit, to contain the entire boot-time copy table.
Controlling the Placement of the Linker-Generated Copy Table Sections illustrates how you can control the placement of the linker-generated copy table sections using the input section names in the linker command file.
SECTIONS
{
UNION
{
.first: { a1.c.obj(.text), b1.c.obj(.text), c1.c.obj(.text) }
load = EMEM, run = PMEM, table(BINIT), table(_first_ctbl)
.second: { a2.c.obj(.text), b2.c.obj(.text) }
load = EMEM, run = PMEM, table(_second_ctbl)
}
.extra: load = EMEM, run = PMEM, table(BINIT)
...
.ovly: { } > BMEM
.binit: { } > BMEM
}For the linker command file in Controlling the Placement of the Linker-Generated Copy Table Sections, the boot-time copy table is generated into a .binit input section, which is collected into the .binit output section, which is mapped to an address in the BMEM memory area. The _first_ctbl is generated into the .ovly:_first_ctbl input section and the _second_ctbl is generated into the .ovly:_second_ctbl input section. Since the base names of these input sections match the name of the .ovly output section, the input sections are collected into the .ovly output section, which is then mapped to an address in the BMEM memory area.
If you do not provide explicit placement instructions for the linker-generated copy table sections, they are allocated according to the linker's default placement algorithm.
The linker does not allow other types of input sections to be combined with a copy table input section in the same output section. The linker does not allow a copy table section that was created from a partial link session to be used as input to a succeeding link session.