[LLVMbugs] [Bug 15332] New: PPC32 SVR4 ABI has no Red Zone

[bugzilla-daemon at llvm.org]

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: unassignedbugs at nondot.org
          Reporter: florob at babelmonkeys.de
                CC: llvmbugs at cs.uiuc.edu
    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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