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cpu-supplement: Fix PowerPC TOC limitation

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Update #3082.
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Sebastian Huber 2017-08-24 15:54:41 +02:00
parent 6eef7a4b15
commit 873ba805c7
1 changed files with 3 additions and 2 deletions
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cpu-supplement/powerpc.rst
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@ -131,8 +131,9 @@ Thread-local storage is supported.
setup. A valid stack pointer is not enough to call C functions. They may
use the TOC to get addresses and constants.
* The TOC must be within the first 4GiB of the address space. This simplifies
the interrupt prologue.
* The TOC must be within the first 2GiB of the address space. This simplifies
the interrupt prologue, since the `r2` can be set to `.TOC.` via the usual
`lis` followed by `ori` combination. The `lis` is subject to sign-extension.
* The `PPC_REG_LOAD`, `PPC_REG_STORE`, `PPC_REG_STORE_UPDATE`, and
`PPC_REG_CMP` macros are available for assembly code to provide register size