http://llvm.org/bugs/show_bug.cgi?id=15332
Bug ID: 15332
Summary: PPC32 SVR4 ABI has no Red Zone
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Backend: PowerPC
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 10054
--> http://llvm.org/bugs/attachment.cgi?id=10054&action=edit
Patch to avoid generating stackless code on PPC32
As has been noted in a fixme for a while the PPC32 SVR4 ABI has no Red Zone.
LLVM currently still generates stackless code for it though.
The attached patch attempts to fix this, by only generating stackless code
when:
* The system is PPC64 (all supported PPC64 ABIs appear to have a red zone)
* The SVR4 ABI isn't used
* There are no stack allocated variables (FrameSize == 0)
This appears to work fine in my tests (freestanding code on a e300 based
Freescale, previously broken since system calls share the stack).
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