Load$$ execution region symbols

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最新推荐文章于 2024-10-02 14:39:55 发布

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原文链接：http://www.cnblogs.com/hwl1023/p/5242804.html

本文详细介绍了链接器为每个执行区域生成的Load$$符号，包括这些符号的描述及它们在初始化前后所对应的地址信息。同时，文章还强调了这些符号在不同情况下的应用限制。

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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$$Length`	Load length of the ZI output section in bytes. The Load Length of ZI is zero unless `region_name` has the `ZEROPAD`scatter-loading keyword set. If `ZEROPAD` is set then: Load Length = `Image$$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

转载于:https://www.cnblogs.com/hwl1023/p/5242804.html