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Code Issues Releases Wiki Activity

Changed some awkward wording in linux-bootstrap-2.

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This commit is contained in:
Jeremy Lacomis 2015-10-20 16:41:00 -04:00
parent 99f21930d1
commit 2cb4d459de
2 changed files with 2 additions and 1 deletions
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Booting/linux-bootstrap-2.md
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@ -206,7 +206,7 @@ ENDPROC(memcpy)
Yeah, we just moved to C code and now assembly again :) First of all we can see that `memcpy` and other routines which are defined here, start and end with the two macros: `GLOBAL` and `ENDPROC`. `GLOBAL` is described in [arch/x86/include/asm/linkage.h](https://github.com/torvalds/linux/blob/master/arch/x86/include/asm/linkage.h) which defines `globl` directive and the label for it. `ENDPROC` is described in [include/linux/linkage.h](https://github.com/torvalds/linux/blob/master/include/linux/linkage.h) which marks `name` symbol as function name and ends with the size of the `name` symbol.
Implementation of `memcpy` is easy. At first, it pushes values from `si` and `di` registers to the stack because their values will change during the `memcpy`, so it pushes them on the stack to preserve their values. `memcpy` (and other functions in copy.S) use `fastcall` calling conventions. So it gets its incoming parameters from the `ax`, `dx` and `cx` registers. Calling `memcpy` looks like this:
Implementation of `memcpy` is easy. At first, it pushes values from `si` and `di` registers to the stack to preserve their values because they will change during the `memcpy`. `memcpy` (and other functions in copy.S) use `fastcall` calling conventions. So it gets its incoming parameters from the `ax`, `dx` and `cx` registers. Calling `memcpy` looks like this:
```c
memcpy(&boot_params.hdr, &hdr, sizeof hdr);

1
contributors.md
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@ -76,3 +76,4 @@ Thank you to all contributors:
* [Bogdan Kulbida](https://github.com/kulbida)
* [Matt Hudgins](https://github.com/mhudgins)
* [Ruth Grace Wong](https://github.com/ruthgrace)
* [Jeremy Lacomis](https://github.com/jlacomis)