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| author | Peter Trommler <ptrommler@acm.org> | 2015-07-03 19:09:06 +0200 |
|---|---|---|
| committer | Ben Gamari <ben@smart-cactus.org> | 2015-07-03 19:09:06 +0200 |
| commit | d3c1dda60d0ec07fc7f593bfd83ec9457dfa7984 (patch) | |
| tree | 6d18388d249d0186c851c2f50f345020001fef7f /includes/CodeGen.Platform.hs | |
| parent | bdf7f133d1d4bcc7ca3c0bbadda51ef542cccfb0 (diff) | |
| download | haskell-d3c1dda60d0ec07fc7f593bfd83ec9457dfa7984.tar.gz | |
Implement PowerPC 64-bit native code backend for Linux
Extend the PowerPC 32-bit native code generator for "64-bit
PowerPC ELF Application Binary Interface Supplement 1.9" by
Ian Lance Taylor and "Power Architecture 64-Bit ELF V2 ABI Specification --
OpenPOWER ABI for Linux Supplement" by IBM.
The latter ABI is mainly used on POWER7/7+ and POWER8
Linux systems running in little-endian mode. The code generator
supports both static and dynamic linking. PowerPC 64-bit
code for ELF ABI 1.9 and 2 is mostly position independent
anyway, and thus so is all the code emitted by the code
generator. In other words, -fPIC does not make a difference.
rts/stg/SMP.h support is implemented.
Following the spirit of the introductory comment in
PPC/CodeGen.hs, the rest of the code is a straightforward
extension of the 32-bit implementation.
Limitations:
* Code is generated only in the medium code model, which
is also gcc's default
* Local symbols are not accessed directly, which seems to
also be the case for 32-bit
* LLVM does not work, but this does not work on 32-bit either
* Must use the system runtime linker in GHCi, because the
GHC linker for "static" object files (rts/Linker.c) for
PPC 64-bit is not implemented. The system runtime
(dynamic) linker works.
* The handling of the system stack (register 1) is not ELF-
compliant so stack traces break. Instead of allocating a new
stack frame, spill code should use the "official" spill area
in the current stack frame and deallocation code should restore
the back chain
* DWARF support is missing
Fixes #9863
Test Plan: validate (on powerpc, too)
Reviewers: simonmar, trofi, erikd, austin
Reviewed By: trofi
Subscribers: bgamari, arnons1, kgardas, thomie
Differential Revision: https://phabricator.haskell.org/D629
GHC Trac Issues: #9863
Diffstat (limited to 'includes/CodeGen.Platform.hs')
| -rw-r--r-- | includes/CodeGen.Platform.hs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/includes/CodeGen.Platform.hs b/includes/CodeGen.Platform.hs index 1d46a0195b..1ff888af91 100644 --- a/includes/CodeGen.Platform.hs +++ b/includes/CodeGen.Platform.hs @@ -881,6 +881,9 @@ freeReg 1 = fastBool False -- The Stack Pointer # if !MACHREGS_darwin -- most non-darwin powerpc OSes use r2 as a TOC pointer or something like that freeReg 2 = fastBool False +-- TODO: make this conditonal for ppc64 ELF +freeReg 13 = fastBool False -- reserved for system thread ID +-- TODO: do not reserve r30 in ppc64 ELF -- at least linux in -fPIC relies on r30 in PLT stubs freeReg 30 = fastBool False # endif |