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Apply lld fixes for internal errors building perl on 32-bit PowerPC

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Merge commit f457863ae345 from llvm git (by Fangrui Song):

  [ELF] Support REL-format R_AARCH64_NONE relocation

  -fprofile-use=/-fprofile-sample-use= compiles may produce REL-format
  .rel.llvm.call-graph-profile even if the prevailing format is RELA on AArch64.
  Add R_AARCH64_NONE to getImplicitAddend to fix this linker error:

  ```
  ld.lld: error: internal linker error: cannot read addend for relocation R_AARCH64_NONE
  PLEASE submit a bug report to https://crbug.com and run tools/clang/scripts/process_crashreports.py (only works inside Google) which will upload a report and include the crash backtrace.
  ```

Merge commit 53fc5d9b9a01 from llvm git (by Fangrui Song):

  [ELF] Support R_PPC_NONE/R_PPC64_NONE in getImplicitAddend

  Similar to f457863ae345d2635026501f5383e0e625869639

Merge commit 767e64fc11d7 from llvm git (by Fangrui Song):

  [ELF] Support some absolute/PC-relative relocation types for REL format

  ctfconvert seems to use REL-format `.rel.SUNW_dof` for 32-bit architectures.
  ```
  Binary file usr/ports/lang/perl5.32/work/perl-5.32.1/dtrace_mini.o matches
  [alfredo.junior@dell-a ~/tmp/llvm-bug]$ readelf -r dtrace_mini.o

  Relocation section (.rel.SUNW_dof):
  r_offset r_info   r_type              st_value st_name
  00000184 0000281a R_PPC_REL32         00000000 $dtrace1772974259.Perl_dtrace_probe_load
  ```

  Support R_PPC_REL32 to fix `ld.lld: error: drti.c:(.SUNW_dof+0x4E4): internal linker error: cannot read addend for relocation R_PPC_REL32`.
  While here, add some common relocation types for AArch64, PPC, and PPC64.
  We perform minimum tests.

  Reviewed By: adalava, arichardson

  Differential Revision: https://reviews.llvm.org/D120535

Requested by:	alfredo
MFC after:	3 days
This commit is contained in:
Dimitry Andric 2022-02-27 13:53:19 +01:00
parent be7cf3f4b8
commit 298c3e8d6b
3 changed files with 39 additions and 0 deletions
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7
contrib/llvm-project/lld/ELF/Arch/AArch64.cpp
View File

@ -199,6 +199,13 @@ int64_t AArch64::getImplicitAddend(const uint8_t *buf, RelType type) const {
switch (type) {
case R_AARCH64_TLSDESC:
return read64(buf + 8);
case R_AARCH64_NONE:
return 0;
case R_AARCH64_PREL32:
return SignExtend64<32>(read32(buf));
case R_AARCH64_ABS64:
case R_AARCH64_PREL64:
return read64(buf);
default:
internalLinkerError(getErrorLocation(buf),
"cannot read addend for relocation " + toString(type));

15
contrib/llvm-project/lld/ELF/Arch/PPC.cpp
View File

@ -27,6 +27,7 @@ public:
RelExpr getRelExpr(RelType type, const Symbol &s,
const uint8_t *loc) const override;
RelType getDynRel(RelType type) const override;
int64_t getImplicitAddend(const uint8_t *buf, RelType type) const override;
void writeGotHeader(uint8_t *buf) const override;
void writePltHeader(uint8_t *buf) const override {
llvm_unreachable("should call writePPC32GlinkSection() instead");
@ -274,6 +275,20 @@ RelType PPC::getDynRel(RelType type) const {
return R_PPC_NONE;
}
int64_t PPC::getImplicitAddend(const uint8_t *buf, RelType type) const {
switch (type) {
case R_PPC_NONE:
return 0;
case R_PPC_ADDR32:
case R_PPC_REL32:
return SignExtend64<32>(read32(buf));
default:
internalLinkerError(getErrorLocation(buf),
"cannot read addend for relocation " + toString(type));
return 0;
}
}
static std::pair<RelType, uint64_t> fromDTPREL(RelType type, uint64_t val) {
uint64_t dtpBiasedVal = val - 0x8000;
switch (type) {

17
contrib/llvm-project/lld/ELF/Arch/PPC64.cpp
View File

@ -369,6 +369,7 @@ public:
RelExpr getRelExpr(RelType type, const Symbol &s,
const uint8_t *loc) const override;
RelType getDynRel(RelType type) const override;
int64_t getImplicitAddend(const uint8_t *buf, RelType type) const override;
void writePltHeader(uint8_t *buf) const override;
void writePlt(uint8_t *buf, const Symbol &sym,
uint64_t pltEntryAddr) const override;
@ -1067,6 +1068,22 @@ RelType PPC64::getDynRel(RelType type) const {
return R_PPC64_NONE;
}
int64_t PPC64::getImplicitAddend(const uint8_t *buf, RelType type) const {
switch (type) {
case R_PPC64_NONE:
return 0;
case R_PPC64_REL32:
return SignExtend64<32>(read32(buf));
case R_PPC64_ADDR64:
case R_PPC64_REL64:
return read64(buf);
default:
internalLinkerError(getErrorLocation(buf),
"cannot read addend for relocation " + toString(type));
return 0;
}
}
void PPC64::writeGotHeader(uint8_t *buf) const {
write64(buf, getPPC64TocBase());
}