1 files changed, 3 insertions, 2 deletions
diff --git a/cpu-supplement/powerpc.rst b/cpu-supplement/powerpc.rst
index c9b4539..d9dfd53 100644
@@ -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