Load$$ execution region symbols

6.3.3 Load$$ execution region symbols

The linker generates Load$$ symbols for every execution region present in the image.

Note

Load$$region_name symbols apply only to execution regions. Load$$LR$$load_region_name symbols apply only to load regions.

The following table shows the symbols that the linker generates for every Load$$ execution region present in the image. All the symbols refer to load addresses after the C library is initialized.

Table 6-2 Load$$ execution region symbols

Symbol	Description
Load$$region_name$$Base	Load address of the region.
Load$$region_name$$Length	Region length in bytes.
Load$$region_name$$Limit	Address of the byte beyond the end of the execution region.
Load$$region_name$$RO$$Base	Address of the RO output section in this execution region.
Load$$region_name$$RO$$Length	Length of the RO output section in bytes.
Load$$region_name$$RO$$Limit	Address of the byte beyond the end of the RO output section in the execution region.
Load$$region_name$$RW$$Base	Address of the RW output section in this execution region.
Load$$region_name$$RW$$Length	Length of the RW output section in bytes.
Load$$region_name$$RW$$Limit	Address of the byte beyond the end of the RW output section in the execution region.
Load$$region_name$$XO$$Base	Address of the XO output section in this execution region.
Load$$region_name$$XO$$Length	Length of the XO output section in bytes.
Load$$region_name$$XO$$Limit	Address of the byte beyond the end of the XO output section in the execution region.
Load$$region_name$$ZI$$Base	Load address of the ZI output section in this execution region.
Load$$region_name$$ZI$$Length	Load length of the ZI output section in bytes. The Load Length of ZI is zero unless region_name has the ZEROPADscatter-loading keyword set. If ZEROPAD is set then: Load Length = Image$$region_name$$ZI$$Length
Load$$region_name$$ZI$$Limit	Load address of the byte beyond the end of the ZI output section in the execution region.

All symbols in this table refer to load addresses before the C library is initialized. Be aware of the following:

• The symbols are absolute because section-relative symbols can only have execution addresses.
• The symbols take into account RW compression.
• References to linker-defined symbols from RW compressed execution regions must be to symbols that are resolvable before RW compression is applied.
• If the linker detects a relocation from an RW-compressed region to a linker-defined symbol that depends on RW compression, then the linker disables compression for that region.
• Any zero-initialized data that is written to the file is taken into account by the Limit and Length values. Zero-initialized data is written into the file when the ZEROPAD scatter-loading keyword is used

　　　　原文： http://www.keil.com/support/man/docs/armlink/armlink_pge1362065953229.htm