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Initial TOC support for PowerPC64 object creation

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This patch adds initial PPC64 TOC MC object creation using the small mcmodel
(a single 64K TOC) adding the some TOC relocations (R_PPC64_TOC,
R_PPC64_TOC16, and R_PPC64_TOC16DS).

The addition of 'undefinedExplicitRelSym' hook on 'MCELFObjectTargetWriter'
is meant to avoid the creation of an unreferenced ".TOC." symbol (used in
the .odp creation) as well to set the R_PPC64_TOC relocation target as the
temporary ".TOC." symbol. On PPC64 ABI, the R_PPC64_TOC relocation should
not point to any symbol.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166677 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adhemerval Zanella
2012-10-25 12:27:42 +00:00
parent c0cd72204d
commit aa71428378
11 changed files with 223 additions and 23 deletions
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13
lib/Target/PowerPC/MCTargetDesc/PPCAsmBackend.cpp
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@@ -29,9 +29,14 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
case FK_Data_1:
case FK_Data_2:
case FK_Data_4:
case FK_Data_8:
case PPC::fixup_ppc_toc:
return Value;
case PPC::fixup_ppc_lo14:
case PPC::fixup_ppc_toc16_ds:
return (Value & 0xffff) << 2;
case PPC::fixup_ppc_brcond14:
return Value & 0x3ffc;
return Value & 0xfffc;
case PPC::fixup_ppc_br24:
return Value & 0x3fffffc;
#if 0
@@ -41,6 +46,7 @@ static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
case PPC::fixup_ppc_ha16:
return ((Value >> 16) + ((Value & 0x8000) ? 1 : 0)) & 0xffff;
case PPC::fixup_ppc_lo16:
case PPC::fixup_ppc_toc16:
return Value & 0xffff;
}
}
@@ -72,7 +78,10 @@ public:
{ "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel },
{ "fixup_ppc_lo16", 16, 16, 0 },
{ "fixup_ppc_ha16", 16, 16, 0 },
{ "fixup_ppc_lo14", 16, 14, 0 }
{ "fixup_ppc_lo14", 16, 14, 0 },
{ "fixup_ppc_toc", 0, 64, 0 },
{ "fixup_ppc_toc16", 16, 16, 0 },
{ "fixup_ppc_toc16_ds", 16, 14, 0 }
};
if (Kind < FirstTargetFixupKind)