[lld] r255332 - [ELF] - R_X86_64_SIZE64/R_X86_64_SIZE32 relocations implemented.
George Rimar via llvm-commits
llvm-commits at lists.llvm.org
Fri Dec 11 00:59:38 PST 2015
Author: grimar
Date: Fri Dec 11 02:59:37 2015
New Revision: 255332
URL: http://llvm.org/viewvc/llvm-project?rev=255332&view=rev
Log:
[ELF] - R_X86_64_SIZE64/R_X86_64_SIZE32 relocations implemented.
R_X86_64_SIZE64/R_X86_64_SIZE32 relocations were introduced in 0.98v of "System V Application Binary Interface x86-64" (http://www.x86-64.org/documentation/abi.pdf).
Calculation for them is Z + A, where:
Z - Represents the size of the symbol whose index resides in the relocation entry.
A - Represents the addend used to compute the value of the relocatable field.
Differential revision: http://reviews.llvm.org/D15335
Added:
lld/trunk/test/ELF/Inputs/relocation-size-shared.s
lld/trunk/test/ELF/relocation-size-shared.s
lld/trunk/test/ELF/relocation-size.s
Modified:
lld/trunk/ELF/InputSection.cpp
lld/trunk/ELF/Target.cpp
lld/trunk/ELF/Target.h
Modified: lld/trunk/ELF/InputSection.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/InputSection.cpp?rev=255332&r1=255331&r2=255332&view=diff
==============================================================================
--- lld/trunk/ELF/InputSection.cpp (original)
+++ lld/trunk/ELF/InputSection.cpp Fri Dec 11 02:59:37 2015
@@ -123,6 +123,14 @@ InputSectionBase<ELFT>::findMipsPairedRe
}
template <class ELFT>
+static typename llvm::object::ELFFile<ELFT>::uintX_t
+getSymSize(SymbolBody &Body) {
+ if (auto *SS = dyn_cast<Defined<ELFT>>(&Body))
+ return SS->Sym.st_size;
+ return 0;
+}
+
+template <class ELFT>
template <bool isRela>
void InputSectionBase<ELFT>::relocate(uint8_t *Buf, uint8_t *BufEnd,
RelIteratorRange<isRela> Rels) {
@@ -153,7 +161,7 @@ void InputSectionBase<ELFT>::relocate(ui
const Elf_Shdr *SymTab = File->getSymbolTable();
if (SymIndex < SymTab->sh_info) {
uintX_t SymVA = getLocalRelTarget(*File, RI);
- Target->relocateOne(BufLoc, BufEnd, Type, AddrLoc, SymVA,
+ Target->relocateOne(BufLoc, BufEnd, Type, AddrLoc, SymVA, 0,
findMipsPairedReloc(Buf, Type, NextRelocs));
continue;
}
@@ -191,11 +199,13 @@ void InputSectionBase<ELFT>::relocate(ui
} else if (!Target->relocNeedsCopy(Type, Body) &&
isa<SharedSymbol<ELFT>>(Body)) {
continue;
- } else if (Target->isTlsDynReloc(Type)) {
+ } else if (Target->isTlsDynReloc(Type) ||
+ Target->isSizeDynReloc(Type, Body)) {
continue;
}
- Target->relocateOne(BufLoc, BufEnd, Type, AddrLoc,
- SymVA + getAddend<ELFT>(RI),
+ uintX_t A = getAddend<ELFT>(RI);
+ uintX_t Size = getSymSize<ELFT>(Body);
+ Target->relocateOne(BufLoc, BufEnd, Type, AddrLoc, SymVA + A, Size + A,
findMipsPairedReloc(Buf, Type, NextRelocs));
}
}
Modified: lld/trunk/ELF/Target.cpp
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Target.cpp?rev=255332&r1=255331&r2=255332&view=diff
==============================================================================
--- lld/trunk/ELF/Target.cpp (original)
+++ lld/trunk/ELF/Target.cpp Fri Dec 11 02:59:37 2015
@@ -87,7 +87,8 @@ public:
bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const override;
bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const override;
void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type, uint64_t P,
- uint64_t SA, uint8_t *PairedLoc = nullptr) const override;
+ uint64_t SA, uint64_t ZA = 0,
+ uint8_t *PairedLoc = nullptr) const override;
bool isTlsOptimized(unsigned Type, const SymbolBody *S) const override;
unsigned relocateTlsOptimize(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
uint64_t P, uint64_t SA,
@@ -120,9 +121,11 @@ public:
bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const override;
bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const override;
void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type, uint64_t P,
- uint64_t SA, uint8_t *PairedLoc = nullptr) const override;
+ uint64_t SA, uint64_t ZA = 0,
+ uint8_t *PairedLoc = nullptr) const override;
bool isRelRelative(uint32_t Type) const override;
bool isTlsOptimized(unsigned Type, const SymbolBody *S) const override;
+ bool isSizeDynReloc(uint32_t Type, const SymbolBody &S) const override;
unsigned relocateTlsOptimize(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
uint64_t P, uint64_t SA,
const SymbolBody &S) const override;
@@ -150,7 +153,8 @@ public:
bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const override;
bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const override;
void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type, uint64_t P,
- uint64_t SA, uint8_t *PairedLoc = nullptr) const override;
+ uint64_t SA, uint64_t ZA = 0,
+ uint8_t *PairedLoc = nullptr) const override;
bool isRelRelative(uint32_t Type) const override;
};
@@ -169,7 +173,8 @@ public:
bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const override;
bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const override;
void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type, uint64_t P,
- uint64_t SA, uint8_t *PairedLoc = nullptr) const override;
+ uint64_t SA, uint64_t ZA = 0,
+ uint8_t *PairedLoc = nullptr) const override;
};
template <class ELFT> class MipsTargetInfo final : public TargetInfo {
@@ -185,7 +190,8 @@ public:
bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const override;
bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const override;
void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type, uint64_t P,
- uint64_t SA, uint8_t *PairedLoc = nullptr) const override;
+ uint64_t SA, uint64_t ZA = 0,
+ uint8_t *PairedLoc = nullptr) const override;
};
} // anonymous namespace
@@ -228,6 +234,10 @@ unsigned TargetInfo::getPltRefReloc(unsi
bool TargetInfo::isRelRelative(uint32_t Type) const { return true; }
+bool TargetInfo::isSizeDynReloc(uint32_t Type, const SymbolBody &S) const {
+ return false;
+}
+
unsigned TargetInfo::relocateTlsOptimize(uint8_t *Loc, uint8_t *BufEnd,
uint32_t Type, uint64_t P, uint64_t SA,
const SymbolBody &S) const {
@@ -338,7 +348,7 @@ bool X86TargetInfo::relocNeedsPlt(uint32
}
void X86TargetInfo::relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
- uint64_t P, uint64_t SA,
+ uint64_t P, uint64_t SA, uint64_t ZA,
uint8_t *PairedLoc) const {
switch (Type) {
case R_386_32:
@@ -623,10 +633,18 @@ bool X86_64TargetInfo::isRelRelative(uin
case R_X86_64_PC32:
case R_X86_64_PC64:
case R_X86_64_PLT32:
+ case R_X86_64_SIZE32:
+ case R_X86_64_SIZE64:
return true;
}
}
+bool X86_64TargetInfo::isSizeDynReloc(uint32_t Type,
+ const SymbolBody &S) const {
+ return (Type == R_X86_64_SIZE32 || Type == R_X86_64_SIZE64) &&
+ canBePreempted(&S, false);
+}
+
bool X86_64TargetInfo::isTlsOptimized(unsigned Type,
const SymbolBody *S) const {
if (Config->Shared || (S && !S->isTLS()))
@@ -767,7 +785,7 @@ unsigned X86_64TargetInfo::relocateTlsOp
}
void X86_64TargetInfo::relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
- uint64_t P, uint64_t SA,
+ uint64_t P, uint64_t SA, uint64_t ZA,
uint8_t *PairedLoc) const {
switch (Type) {
case R_X86_64_32:
@@ -794,6 +812,12 @@ void X86_64TargetInfo::relocateOne(uint8
case R_X86_64_TLSLD:
write32le(Loc, SA - P);
break;
+ case R_X86_64_SIZE32:
+ write32le(Loc, ZA);
+ break;
+ case R_X86_64_SIZE64:
+ write64le(Loc, ZA);
+ break;
case R_X86_64_TPOFF32: {
uint64_t Val = SA - Out<ELF64LE>::TlsPhdr->p_memsz;
checkInt<32>(Val, Type);
@@ -915,7 +939,7 @@ bool PPC64TargetInfo::isRelRelative(uint
}
void PPC64TargetInfo::relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
- uint64_t P, uint64_t SA,
+ uint64_t P, uint64_t SA, uint64_t ZA,
uint8_t *PairedLoc) const {
uint64_t TB = getPPC64TocBase();
@@ -1153,7 +1177,7 @@ static uint64_t getAArch64Page(uint64_t
void AArch64TargetInfo::relocateOne(uint8_t *Loc, uint8_t *BufEnd,
uint32_t Type, uint64_t P, uint64_t SA,
- uint8_t *PairedLoc) const {
+ uint64_t ZA, uint8_t *PairedLoc) const {
switch (Type) {
case R_AARCH64_ABS16:
checkIntUInt<16>(SA, Type);
@@ -1266,7 +1290,7 @@ bool MipsTargetInfo<ELFT>::relocNeedsPlt
template <class ELFT>
void MipsTargetInfo<ELFT>::relocateOne(uint8_t *Loc, uint8_t *BufEnd,
uint32_t Type, uint64_t P, uint64_t SA,
- uint8_t *PairedLoc) const {
+ uint64_t ZA, uint8_t *PairedLoc) const {
const endianness E = ELFT::TargetEndianness;
switch (Type) {
case R_MIPS_32:
Modified: lld/trunk/ELF/Target.h
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/ELF/Target.h?rev=255332&r1=255331&r2=255332&view=diff
==============================================================================
--- lld/trunk/ELF/Target.h (original)
+++ lld/trunk/ELF/Target.h Fri Dec 11 02:59:37 2015
@@ -53,11 +53,12 @@ public:
uint64_t GotEntryAddr, uint64_t PltEntryAddr,
int32_t Index, unsigned RelOff) const = 0;
virtual bool isRelRelative(uint32_t Type) const;
+ virtual bool isSizeDynReloc(uint32_t Type, const SymbolBody &S) const;
virtual bool relocNeedsCopy(uint32_t Type, const SymbolBody &S) const;
virtual bool relocNeedsGot(uint32_t Type, const SymbolBody &S) const = 0;
virtual bool relocNeedsPlt(uint32_t Type, const SymbolBody &S) const = 0;
virtual void relocateOne(uint8_t *Loc, uint8_t *BufEnd, uint32_t Type,
- uint64_t P, uint64_t SA,
+ uint64_t P, uint64_t SA, uint64_t ZA = 0,
uint8_t *PairedLoc = nullptr) const = 0;
virtual bool isTlsOptimized(unsigned Type, const SymbolBody *S) const;
virtual unsigned relocateTlsOptimize(uint8_t *Loc, uint8_t *BufEnd,
Added: lld/trunk/test/ELF/Inputs/relocation-size-shared.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/Inputs/relocation-size-shared.s?rev=255332&view=auto
==============================================================================
--- lld/trunk/test/ELF/Inputs/relocation-size-shared.s (added)
+++ lld/trunk/test/ELF/Inputs/relocation-size-shared.s Fri Dec 11 02:59:37 2015
@@ -0,0 +1,6 @@
+.data
+.global fooshared
+.type fooshared,%object
+.size fooshared,26
+fooshared:
+.zero 26
Added: lld/trunk/test/ELF/relocation-size-shared.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/relocation-size-shared.s?rev=255332&view=auto
==============================================================================
--- lld/trunk/test/ELF/relocation-size-shared.s (added)
+++ lld/trunk/test/ELF/relocation-size-shared.s Fri Dec 11 02:59:37 2015
@@ -0,0 +1,78 @@
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/relocation-size-shared.s -o %tso.o
+// RUN: ld.lld -shared %tso.o -o %tso
+// RUN: ld.lld %t.o %tso -o %t1
+// RUN: llvm-readobj -r %t1 | FileCheck --check-prefix=RELOCSHARED %s
+// RUN: llvm-objdump -d %t1 | FileCheck --check-prefix=DISASM %s
+
+// RELOCSHARED: Relocations [
+// RELOCSHARED-NEXT: Section ({{.*}}) .rela.dyn {
+// RELOCSHARED-NEXT: 0x11018 R_X86_64_SIZE64 fooshared 0xFFFFFFFFFFFFFFFF
+// RELOCSHARED-NEXT: 0x11020 R_X86_64_SIZE64 fooshared 0x0
+// RELOCSHARED-NEXT: 0x11028 R_X86_64_SIZE64 fooshared 0x1
+// RELOCSHARED-NEXT: 0x11048 R_X86_64_SIZE32 fooshared 0xFFFFFFFFFFFFFFFF
+// RELOCSHARED-NEXT: 0x1104F R_X86_64_SIZE32 fooshared 0x0
+// RELOCSHARED-NEXT: 0x11056 R_X86_64_SIZE32 fooshared 0x1
+// RELOCSHARED-NEXT: }
+// RELOCSHARED-NEXT:]
+
+// DISASM: Disassembly of section .text:
+// DISASM: _data:
+// DISASM-NEXT: 11000: 19 00
+// DISASM-NEXT: 11002: 00 00
+// DISASM-NEXT: 11004: 00 00
+// DISASM-NEXT: 11006: 00 00
+// DISASM-NEXT: 11008: 1a 00
+// DISASM-NEXT: 1100a: 00 00
+// DISASM-NEXT: 1100c: 00 00
+// DISASM-NEXT: 1100e: 00 00
+// DISASM-NEXT: 11010: 1b 00
+// DISASM-NEXT: 11012: 00 00
+// DISASM-NEXT: 11014: 00 00
+// DISASM-NEXT: 11016: 00 00
+// DISASM-NEXT: 11018: 00 00
+// DISASM-NEXT: 1101a: 00 00
+// DISASM-NEXT: 1101c: 00 00
+// DISASM-NEXT: 1101e: 00 00
+// DISASM-NEXT: 11020: 00 00
+// DISASM-NEXT: 11022: 00 00
+// DISASM-NEXT: 11024: 00 00
+// DISASM-NEXT: 11026: 00 00
+// DISASM-NEXT: 11028: 00 00
+// DISASM-NEXT: 1102a: 00 00
+// DISASM-NEXT: 1102c: 00 00
+// DISASM-NEXT: 1102e: 00 00
+// DISASM: _start:
+// DISASM-NEXT: 11030: 8b 04 25 19 00 00 00 movl 25, %eax
+// DISASM-NEXT: 11037: 8b 04 25 1a 00 00 00 movl 26, %eax
+// DISASM-NEXT: 1103e: 8b 04 25 1b 00 00 00 movl 27, %eax
+// DISASM-NEXT: 11045: 8b 04 25 00 00 00 00 movl 0, %eax
+// DISASM-NEXT: 1104c: 8b 04 25 00 00 00 00 movl 0, %eax
+// DISASM-NEXT: 11053: 8b 04 25 00 00 00 00 movl 0, %eax
+
+.data
+.global foo
+.type foo,%object
+.size foo,26
+foo:
+.zero 26
+
+.text
+_data:
+ // R_X86_64_SIZE64:
+ .quad foo at SIZE-1
+ .quad foo at SIZE
+ .quad foo at SIZE+1
+ .quad fooshared at SIZE-1
+ .quad fooshared at SIZE
+ .quad fooshared at SIZE+1
+
+.globl _start
+_start:
+ // R_X86_64_SIZE32:
+ movl foo at SIZE-1,%eax
+ movl foo at SIZE,%eax
+ movl foo at SIZE+1,%eax
+ movl fooshared at SIZE-1,%eax
+ movl fooshared at SIZE,%eax
+ movl fooshared at SIZE+1,%eax
Added: lld/trunk/test/ELF/relocation-size.s
URL: http://llvm.org/viewvc/llvm-project/lld/trunk/test/ELF/relocation-size.s?rev=255332&view=auto
==============================================================================
--- lld/trunk/test/ELF/relocation-size.s (added)
+++ lld/trunk/test/ELF/relocation-size.s Fri Dec 11 02:59:37 2015
@@ -0,0 +1,123 @@
+// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
+// RUN: ld.lld %t.o -o %t1
+// RUN: llvm-readobj -r %t1 | FileCheck --check-prefix=NORELOC %s
+// RUN: llvm-objdump -d %t1 | FileCheck --check-prefix=DISASM %s
+// RUN: ld.lld -shared %t.o -o %t1
+// RUN: llvm-readobj -r %t1 | FileCheck --check-prefix=RELOCSHARED %s
+// RUN: llvm-objdump -d %t1 | FileCheck --check-prefix=DISASMSHARED %s
+
+// NORELOC: Relocations [
+// NORELOC-NEXT: ]
+
+// DISASM: Disassembly of section .text:
+// DISASM-NEXT: _data:
+// DISASM-NEXT: 11000: 19 00
+// DISASM-NEXT: 11002: 00 00
+// DISASM-NEXT: 11004: 00 00
+// DISASM-NEXT: 11006: 00 00
+// DISASM-NEXT: 11008: 1a 00
+// DISASM-NEXT: 1100a: 00 00
+// DISASM-NEXT: 1100c: 00 00
+// DISASM-NEXT: 1100e: 00 00
+// DISASM-NEXT: 11010: 1b 00
+// DISASM-NEXT: 11012: 00 00
+// DISASM-NEXT: 11014: 00 00
+// DISASM-NEXT: 11016: 00 00
+// DISASM-NEXT: 11018: 19 00
+// DISASM-NEXT: 1101a: 00 00
+// DISASM-NEXT: 1101c: 00 00
+// DISASM-NEXT: 1101e: 00 00
+// DISASM-NEXT: 11020: 1a 00
+// DISASM-NEXT: 11022: 00 00
+// DISASM-NEXT: 11024: 00 00
+// DISASM-NEXT: 11026: 00 00
+// DISASM-NEXT: 11028: 1b 00
+// DISASM-NEXT: 1102a: 00 00
+// DISASM-NEXT: 1102c: 00 00
+// DISASM-NEXT: 1102e: 00 00
+// DISASM: _start:
+// DISASM-NEXT: 11030: 8b 04 25 19 00 00 00 movl 25, %eax
+// DISASM-NEXT: 11037: 8b 04 25 1a 00 00 00 movl 26, %eax
+// DISASM-NEXT: 1103e: 8b 04 25 1b 00 00 00 movl 27, %eax
+// DISASM-NEXT: 11045: 8b 04 25 19 00 00 00 movl 25, %eax
+// DISASM-NEXT: 1104c: 8b 04 25 1a 00 00 00 movl 26, %eax
+// DISASM-NEXT: 11053: 8b 04 25 1b 00 00 00 movl 27, %eax
+
+// RELOCSHARED: Relocations [
+// RELOCSHARED-NEXT: Section ({{.*}}) .rela.dyn {
+// RELOCSHARED-NEXT: 0x1000 R_X86_64_SIZE64 foo 0xFFFFFFFFFFFFFFFF
+// RELOCSHARED-NEXT: 0x1008 R_X86_64_SIZE64 foo 0x0
+// RELOCSHARED-NEXT: 0x1010 R_X86_64_SIZE64 foo 0x1
+// RELOCSHARED-NEXT: 0x1033 R_X86_64_SIZE32 foo 0xFFFFFFFFFFFFFFFF
+// RELOCSHARED-NEXT: 0x103A R_X86_64_SIZE32 foo 0x0
+// RELOCSHARED-NEXT: 0x1041 R_X86_64_SIZE32 foo 0x1
+// RELOCSHARED-NEXT: }
+// RELOCSHARED-NEXT: ]
+
+// DISASMSHARED: Disassembly of section .text:
+// DISASMSHARED-NEXT: _data:
+// DISASMSHARED-NEXT: 1000: 00 00
+// DISASMSHARED-NEXT: 1002: 00 00
+// DISASMSHARED-NEXT: 1004: 00 00
+// DISASMSHARED-NEXT: 1006: 00 00
+// DISASMSHARED-NEXT: 1008: 00 00
+// DISASMSHARED-NEXT: 100a: 00 00
+// DISASMSHARED-NEXT: 100c: 00 00
+// DISASMSHARED-NEXT: 100e: 00 00
+// DISASMSHARED-NEXT: 1010: 00 00
+// DISASMSHARED-NEXT: 1012: 00 00
+// DISASMSHARED-NEXT: 1014: 00 00
+// DISASMSHARED-NEXT: 1016: 00 00
+// DISASMSHARED-NEXT: 1018: 19 00
+// DISASMSHARED-NEXT: 101a: 00 00
+// DISASMSHARED-NEXT: 101c: 00 00
+// DISASMSHARED-NEXT: 101e: 00 00
+// DISASMSHARED-NEXT: 1020: 1a 00
+// DISASMSHARED-NEXT: 1022: 00 00
+// DISASMSHARED-NEXT: 1024: 00 00
+// DISASMSHARED-NEXT: 1026: 00 00
+// DISASMSHARED-NEXT: 1028: 1b 00
+// DISASMSHARED-NEXT: 102a: 00 00
+// DISASMSHARED-NEXT: 102c: 00 00
+// DISASMSHARED-NEXT: 102e: 00 00
+// DISASMSHARED: _start:
+// DISASMSHARED-NEXT: 1030: 8b 04 25 00 00 00 00 movl 0, %eax
+// DISASMSHARED-NEXT: 1037: 8b 04 25 00 00 00 00 movl 0, %eax
+// DISASMSHARED-NEXT: 103e: 8b 04 25 00 00 00 00 movl 0, %eax
+// DISASMSHARED-NEXT: 1045: 8b 04 25 19 00 00 00 movl 25, %eax
+// DISASMSHARED-NEXT: 104c: 8b 04 25 1a 00 00 00 movl 26, %eax
+// DISASMSHARED-NEXT: 1053: 8b 04 25 1b 00 00 00 movl 27, %eax
+
+.data
+.global foo
+.type foo,%object
+.size foo,26
+foo:
+.zero 26
+
+.data
+.global foohidden
+.hidden foohidden
+.type foohidden,%object
+.size foohidden,26
+foohidden:
+.zero 26
+
+.text
+_data:
+ // R_X86_64_SIZE64:
+ .quad foo at SIZE-1
+ .quad foo at SIZE
+ .quad foo at SIZE+1
+ .quad foohidden at SIZE-1
+ .quad foohidden at SIZE
+ .quad foohidden at SIZE+1
+.globl _start
+_start:
+ // R_X86_64_SIZE32:
+ movl foo at SIZE-1,%eax
+ movl foo at SIZE,%eax
+ movl foo at SIZE+1,%eax
+ movl foohidden at SIZE-1,%eax
+ movl foohidden at SIZE,%eax
+ movl foohidden at SIZE+1,%eax
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