[llvm-branch-commits] [lld] PR for llvm/llvm-project#79507 (PR #79509)
via llvm-branch-commits
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Thu Jan 25 13:53:39 PST 2024
https://github.com/github-actions[bot] created https://github.com/llvm/llvm-project/pull/79509
resolves llvm/llvm-project#79507
>From a1c2f9c65b7c532859054a84f7e29288a5eea4fa Mon Sep 17 00:00:00 2001
From: Fangrui Song <i at maskray.me>
Date: Thu, 25 Jan 2024 10:09:43 -0800
Subject: [PATCH 1/3] [ELF] Clean up R_RISCV_RELAX code. NFC
(cherry picked from commit ccb99f221422b8de5e1ae04d3427f15878f7cd93)
---
lld/ELF/Arch/RISCV.cpp | 65 ++++++++++++++++++++++--------------------
1 file changed, 34 insertions(+), 31 deletions(-)
diff --git a/lld/ELF/Arch/RISCV.cpp b/lld/ELF/Arch/RISCV.cpp
index d7d3d3e4781497..a92f7bf590c4b4 100644
--- a/lld/ELF/Arch/RISCV.cpp
+++ b/lld/ELF/Arch/RISCV.cpp
@@ -102,6 +102,26 @@ static uint32_t setLO12_S(uint32_t insn, uint32_t imm) {
(extractBits(imm, 4, 0) << 7);
}
+namespace {
+struct SymbolAnchor {
+ uint64_t offset;
+ Defined *d;
+ bool end; // true for the anchor of st_value+st_size
+};
+} // namespace
+
+struct elf::RISCVRelaxAux {
+ // This records symbol start and end offsets which will be adjusted according
+ // to the nearest relocDeltas element.
+ SmallVector<SymbolAnchor, 0> anchors;
+ // For relocations[i], the actual offset is
+ // r_offset - (i ? relocDeltas[i-1] : 0).
+ std::unique_ptr<uint32_t[]> relocDeltas;
+ // For relocations[i], the actual type is relocTypes[i].
+ std::unique_ptr<RelType[]> relocTypes;
+ SmallVector<uint32_t, 0> writes;
+};
+
RISCV::RISCV() {
copyRel = R_RISCV_COPY;
pltRel = R_RISCV_JUMP_SLOT;
@@ -520,14 +540,19 @@ void RISCV::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
}
}
+static bool relaxable(ArrayRef<Relocation> relocs, size_t i) {
+ return i + 1 != relocs.size() && relocs[i + 1].type == R_RISCV_RELAX;
+}
+
void RISCV::relocateAlloc(InputSectionBase &sec, uint8_t *buf) const {
uint64_t secAddr = sec.getOutputSection()->addr;
if (auto *s = dyn_cast<InputSection>(&sec))
secAddr += s->outSecOff;
else if (auto *ehIn = dyn_cast<EhInputSection>(&sec))
secAddr += ehIn->getParent()->outSecOff;
- for (size_t i = 0, size = sec.relocs().size(); i != size; ++i) {
- const Relocation &rel = sec.relocs()[i];
+ const ArrayRef<Relocation> relocs = sec.relocs();
+ for (size_t i = 0, size = relocs.size(); i != size; ++i) {
+ const Relocation &rel = relocs[i];
uint8_t *loc = buf + rel.offset;
const uint64_t val =
sec.getRelocTargetVA(sec.file, rel.type, rel.addend,
@@ -538,7 +563,7 @@ void RISCV::relocateAlloc(InputSectionBase &sec, uint8_t *buf) const {
break;
case R_RISCV_LEB128:
if (i + 1 < size) {
- const Relocation &rel1 = sec.relocs()[i + 1];
+ const Relocation &rel1 = relocs[i + 1];
if (rel.type == R_RISCV_SET_ULEB128 &&
rel1.type == R_RISCV_SUB_ULEB128 && rel.offset == rel1.offset) {
auto val = rel.sym->getVA(rel.addend) - rel1.sym->getVA(rel1.addend);
@@ -560,26 +585,6 @@ void RISCV::relocateAlloc(InputSectionBase &sec, uint8_t *buf) const {
}
}
-namespace {
-struct SymbolAnchor {
- uint64_t offset;
- Defined *d;
- bool end; // true for the anchor of st_value+st_size
-};
-} // namespace
-
-struct elf::RISCVRelaxAux {
- // This records symbol start and end offsets which will be adjusted according
- // to the nearest relocDeltas element.
- SmallVector<SymbolAnchor, 0> anchors;
- // For relocations[i], the actual offset is r_offset - (i ? relocDeltas[i-1] :
- // 0).
- std::unique_ptr<uint32_t[]> relocDeltas;
- // For relocations[i], the actual type is relocTypes[i].
- std::unique_ptr<RelType[]> relocTypes;
- SmallVector<uint32_t, 0> writes;
-};
-
static void initSymbolAnchors() {
SmallVector<InputSection *, 0> storage;
for (OutputSection *osec : outputSections) {
@@ -715,14 +720,15 @@ static void relaxHi20Lo12(const InputSection &sec, size_t i, uint64_t loc,
static bool relax(InputSection &sec) {
const uint64_t secAddr = sec.getVA();
+ const MutableArrayRef<Relocation> relocs = sec.relocs();
auto &aux = *sec.relaxAux;
bool changed = false;
ArrayRef<SymbolAnchor> sa = ArrayRef(aux.anchors);
uint64_t delta = 0;
- std::fill_n(aux.relocTypes.get(), sec.relocs().size(), R_RISCV_NONE);
+ std::fill_n(aux.relocTypes.get(), relocs.size(), R_RISCV_NONE);
aux.writes.clear();
- for (auto [i, r] : llvm::enumerate(sec.relocs())) {
+ for (auto [i, r] : llvm::enumerate(relocs)) {
const uint64_t loc = secAddr + r.offset - delta;
uint32_t &cur = aux.relocDeltas[i], remove = 0;
switch (r.type) {
@@ -743,23 +749,20 @@ static bool relax(InputSection &sec) {
}
case R_RISCV_CALL:
case R_RISCV_CALL_PLT:
- if (i + 1 != sec.relocs().size() &&
- sec.relocs()[i + 1].type == R_RISCV_RELAX)
+ if (relaxable(relocs, i))
relaxCall(sec, i, loc, r, remove);
break;
case R_RISCV_TPREL_HI20:
case R_RISCV_TPREL_ADD:
case R_RISCV_TPREL_LO12_I:
case R_RISCV_TPREL_LO12_S:
- if (i + 1 != sec.relocs().size() &&
- sec.relocs()[i + 1].type == R_RISCV_RELAX)
+ if (relaxable(relocs, i))
relaxTlsLe(sec, i, loc, r, remove);
break;
case R_RISCV_HI20:
case R_RISCV_LO12_I:
case R_RISCV_LO12_S:
- if (i + 1 != sec.relocs().size() &&
- sec.relocs()[i + 1].type == R_RISCV_RELAX)
+ if (relaxable(relocs, i))
relaxHi20Lo12(sec, i, loc, r, remove);
break;
}
>From 7c30679845b003f6056a66021f58b60dd205612a Mon Sep 17 00:00:00 2001
From: Fangrui Song <i at maskray.me>
Date: Thu, 25 Jan 2024 10:17:36 -0800
Subject: [PATCH 2/3] [ELF] Fix terminology: TLS optimizations instead of TLS
relaxation. NFC
(cherry picked from commit 849951f8759171cb6c74d3ccbcf154506fc1f0ae)
---
lld/ELF/Relocations.cpp | 38 +++++++++++++++++++-------------------
1 file changed, 19 insertions(+), 19 deletions(-)
diff --git a/lld/ELF/Relocations.cpp b/lld/ELF/Relocations.cpp
index b6a317bc3b6d69..3490a701d7189f 100644
--- a/lld/ELF/Relocations.cpp
+++ b/lld/ELF/Relocations.cpp
@@ -1286,17 +1286,16 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
}
// ARM, Hexagon, LoongArch and RISC-V do not support GD/LD to IE/LE
- // relaxation.
+ // optimizations.
// For PPC64, if the file has missing R_PPC64_TLSGD/R_PPC64_TLSLD, disable
- // relaxation as well.
- bool toExecRelax = !config->shared && config->emachine != EM_ARM &&
- config->emachine != EM_HEXAGON &&
- config->emachine != EM_LOONGARCH &&
- config->emachine != EM_RISCV &&
- !c.file->ppc64DisableTLSRelax;
+ // optimization as well.
+ bool execOptimize =
+ !config->shared && config->emachine != EM_ARM &&
+ config->emachine != EM_HEXAGON && config->emachine != EM_LOONGARCH &&
+ config->emachine != EM_RISCV && !c.file->ppc64DisableTLSRelax;
// If we are producing an executable and the symbol is non-preemptable, it
- // must be defined and the code sequence can be relaxed to use Local-Exec.
+ // must be defined and the code sequence can be optimized to use Local-Exec.
//
// ARM and RISC-V do not support any relaxations for TLS relocations, however,
// we can omit the DTPMOD dynamic relocations and resolve them at link time
@@ -1309,8 +1308,8 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
// module index, with a special value of 0 for the current module. GOT[e1] is
// unused. There only needs to be one module index entry.
if (oneof<R_TLSLD_GOT, R_TLSLD_GOTPLT, R_TLSLD_PC, R_TLSLD_HINT>(expr)) {
- // Local-Dynamic relocs can be relaxed to Local-Exec.
- if (toExecRelax) {
+ // Local-Dynamic relocs can be optimized to Local-Exec.
+ if (execOptimize) {
c.addReloc({target->adjustTlsExpr(type, R_RELAX_TLS_LD_TO_LE), type,
offset, addend, &sym});
return target->getTlsGdRelaxSkip(type);
@@ -1322,16 +1321,17 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
return 1;
}
- // Local-Dynamic relocs can be relaxed to Local-Exec.
+ // Local-Dynamic relocs can be optimized to Local-Exec.
if (expr == R_DTPREL) {
- if (toExecRelax)
+ if (execOptimize)
expr = target->adjustTlsExpr(type, R_RELAX_TLS_LD_TO_LE);
c.addReloc({expr, type, offset, addend, &sym});
return 1;
}
// Local-Dynamic sequence where offset of tls variable relative to dynamic
- // thread pointer is stored in the got. This cannot be relaxed to Local-Exec.
+ // thread pointer is stored in the got. This cannot be optimized to
+ // Local-Exec.
if (expr == R_TLSLD_GOT_OFF) {
sym.setFlags(NEEDS_GOT_DTPREL);
c.addReloc({expr, type, offset, addend, &sym});
@@ -1341,13 +1341,13 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
if (oneof<R_AARCH64_TLSDESC_PAGE, R_TLSDESC, R_TLSDESC_CALL, R_TLSDESC_PC,
R_TLSDESC_GOTPLT, R_TLSGD_GOT, R_TLSGD_GOTPLT, R_TLSGD_PC,
R_LOONGARCH_TLSGD_PAGE_PC>(expr)) {
- if (!toExecRelax) {
+ if (!execOptimize) {
sym.setFlags(NEEDS_TLSGD);
c.addReloc({expr, type, offset, addend, &sym});
return 1;
}
- // Global-Dynamic relocs can be relaxed to Initial-Exec or Local-Exec
+ // Global-Dynamic/TLSDESC can be optimized to Initial-Exec or Local-Exec
// depending on the symbol being locally defined or not.
if (sym.isPreemptible) {
sym.setFlags(NEEDS_TLSGD_TO_IE);
@@ -1363,9 +1363,9 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
if (oneof<R_GOT, R_GOTPLT, R_GOT_PC, R_AARCH64_GOT_PAGE_PC,
R_LOONGARCH_GOT_PAGE_PC, R_GOT_OFF, R_TLSIE_HINT>(expr)) {
ctx.hasTlsIe.store(true, std::memory_order_relaxed);
- // Initial-Exec relocs can be relaxed to Local-Exec if the symbol is locally
- // defined.
- if (toExecRelax && isLocalInExecutable) {
+ // Initial-Exec relocs can be optimized to Local-Exec if the symbol is
+ // locally defined.
+ if (execOptimize && isLocalInExecutable) {
c.addReloc({R_RELAX_TLS_IE_TO_LE, type, offset, addend, &sym});
} else if (expr != R_TLSIE_HINT) {
sym.setFlags(NEEDS_TLSIE);
@@ -1463,7 +1463,7 @@ template <class ELFT, class RelTy> void RelocationScanner::scanOne(RelTy *&i) {
in.got->hasGotOffRel.store(true, std::memory_order_relaxed);
}
- // Process TLS relocations, including relaxing TLS relocations. Note that
+ // Process TLS relocations, including TLS optimizations. Note that
// R_TPREL and R_TPREL_NEG relocations are resolved in processAux.
if (sym.isTls()) {
if (unsigned processed =
>From 109d70ec6a83c98253051cc26fcd1a7826fa037b Mon Sep 17 00:00:00 2001
From: Fangrui Song <i at maskray.me>
Date: Thu, 25 Jan 2024 13:42:31 -0800
Subject: [PATCH 3/3] [ELF] Implement R_RISCV_TLSDESC for RISC-V
Support
R_RISCV_TLSDESC_HI20/R_RISCV_TLSDESC_LOAD_LO12/R_RISCV_TLSDESC_ADD_LO12/R_RISCV_TLSDESC_CALL.
LOAD_LO12/ADD_LO12/CALL relocations reference a label at the HI20
location, which requires special handling. We save the value of HI20 to
be reused. Two interleaved TLSDESC code sequences, which compilers do
not generate, are unsupported.
For -no-pie/-pie links, TLSDESC to initial-exec or local-exec
optimizations are eligible. Implement the relevant hooks
(R_RELAX_TLS_GD_TO_LE, R_RELAX_TLS_GD_TO_IE): the first two instructions
are converted to NOP while the latter two are converted to a GOT load or
a lui+addi.
The first two instructions, which would be converted to NOP, are removed
instead in the presence of relaxation. Relaxation is eligible as long as
the R_RISCV_TLSDESC_HI20 relocation has a pairing R_RISCV_RELAX,
regardless of whether the following instructions have a R_RISCV_RELAX.
In addition, for the TLSDESC to LE optimization (`lui a0,<hi20>; addi a0,a0,<lo12>`),
`lui` can be removed (i.e. use the short form) if hi20 is 0.
```
// TLSDESC to LE/IE optimization
.Ltlsdesc_hi2:
auipc a4, %tlsdesc_hi(c) # if relax: remove; otherwise, NOP
load a5, %tlsdesc_load_lo(.Ltlsdesc_hi2)(a4) # if relax: remove; otherwise, NOP
addi a0, a4, %tlsdesc_add_lo(.Ltlsdesc_hi2) # if LE && !hi20 {if relax: remove; otherwise, NOP}
jalr t0, 0(a5), %tlsdesc_call(.Ltlsdesc_hi2)
add a0, a0, tp
```
The implementation carefully ensures that an instruction unrelated to
the current TLSDESC code sequence, if immediately follows a removable
instruction (HI20 or LOAD_LO12 OR (LE-specific) ADD_LO12), is not
converted to NOP.
* `riscv64-tlsdesc.s` is inspired by `i386-tlsdesc-gd.s` (https://reviews.llvm.org/D112582).
* `riscv64-tlsdesc-relax.s` tests linker relaxation.
* `riscv-tlsdesc-gd-mixed.s` is inspired by `x86-64-tlsdesc-gd-mixed.s` (https://reviews.llvm.org/D116900).
Link: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/373
Reviewed By: ilovepi
Pull Request: https://github.com/llvm/llvm-project/pull/79239
(cherry picked from commit 1117fdd7c16873eb389e988c6a39ad922bae0fd0)
---
lld/ELF/Arch/RISCV.cpp | 134 +++++++++++++++++-
lld/ELF/Relocations.cpp | 14 +-
lld/test/ELF/riscv-tlsdesc-gd-mixed.s | 26 ++++
lld/test/ELF/riscv-tlsdesc-relax.s | 189 +++++++++++++++++++++++++
lld/test/ELF/riscv-tlsdesc.s | 194 ++++++++++++++++++++++++++
5 files changed, 551 insertions(+), 6 deletions(-)
create mode 100644 lld/test/ELF/riscv-tlsdesc-gd-mixed.s
create mode 100644 lld/test/ELF/riscv-tlsdesc-relax.s
create mode 100644 lld/test/ELF/riscv-tlsdesc.s
diff --git a/lld/ELF/Arch/RISCV.cpp b/lld/ELF/Arch/RISCV.cpp
index a92f7bf590c4b4..8ce92b4badfbd7 100644
--- a/lld/ELF/Arch/RISCV.cpp
+++ b/lld/ELF/Arch/RISCV.cpp
@@ -61,6 +61,7 @@ enum Op {
AUIPC = 0x17,
JALR = 0x67,
LD = 0x3003,
+ LUI = 0x37,
LW = 0x2003,
SRLI = 0x5013,
SUB = 0x40000033,
@@ -73,6 +74,7 @@ enum Reg {
X_T0 = 5,
X_T1 = 6,
X_T2 = 7,
+ X_A0 = 10,
X_T3 = 28,
};
@@ -139,6 +141,7 @@ RISCV::RISCV() {
tlsGotRel = R_RISCV_TLS_TPREL32;
}
gotRel = symbolicRel;
+ tlsDescRel = R_RISCV_TLSDESC;
// .got[0] = _DYNAMIC
gotHeaderEntriesNum = 1;
@@ -207,6 +210,8 @@ int64_t RISCV::getImplicitAddend(const uint8_t *buf, RelType type) const {
case R_RISCV_JUMP_SLOT:
// These relocations are defined as not having an implicit addend.
return 0;
+ case R_RISCV_TLSDESC:
+ return config->is64 ? read64le(buf + 8) : read32le(buf + 4);
}
}
@@ -315,6 +320,12 @@ RelExpr RISCV::getRelExpr(const RelType type, const Symbol &s,
case R_RISCV_PCREL_LO12_I:
case R_RISCV_PCREL_LO12_S:
return R_RISCV_PC_INDIRECT;
+ case R_RISCV_TLSDESC_HI20:
+ case R_RISCV_TLSDESC_LOAD_LO12:
+ case R_RISCV_TLSDESC_ADD_LO12:
+ return R_TLSDESC_PC;
+ case R_RISCV_TLSDESC_CALL:
+ return R_TLSDESC_CALL;
case R_RISCV_TLS_GD_HI20:
return R_TLSGD_PC;
case R_RISCV_TLS_GOT_HI20:
@@ -439,6 +450,7 @@ void RISCV::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
case R_RISCV_GOT_HI20:
case R_RISCV_PCREL_HI20:
+ case R_RISCV_TLSDESC_HI20:
case R_RISCV_TLS_GD_HI20:
case R_RISCV_TLS_GOT_HI20:
case R_RISCV_TPREL_HI20:
@@ -450,6 +462,8 @@ void RISCV::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
}
case R_RISCV_PCREL_LO12_I:
+ case R_RISCV_TLSDESC_LOAD_LO12:
+ case R_RISCV_TLSDESC_ADD_LO12:
case R_RISCV_TPREL_LO12_I:
case R_RISCV_LO12_I: {
uint64_t hi = (val + 0x800) >> 12;
@@ -533,8 +547,14 @@ void RISCV::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {
break;
case R_RISCV_RELAX:
- return; // Ignored (for now)
-
+ return;
+ case R_RISCV_TLSDESC:
+ // The addend is stored in the second word.
+ if (config->is64)
+ write64le(loc + 8, val);
+ else
+ write32le(loc + 4, val);
+ break;
default:
llvm_unreachable("unknown relocation");
}
@@ -544,23 +564,113 @@ static bool relaxable(ArrayRef<Relocation> relocs, size_t i) {
return i + 1 != relocs.size() && relocs[i + 1].type == R_RISCV_RELAX;
}
+static void tlsdescToIe(uint8_t *loc, const Relocation &rel, uint64_t val) {
+ switch (rel.type) {
+ case R_RISCV_TLSDESC_HI20:
+ case R_RISCV_TLSDESC_LOAD_LO12:
+ write32le(loc, 0x00000013); // nop
+ break;
+ case R_RISCV_TLSDESC_ADD_LO12:
+ write32le(loc, utype(AUIPC, X_A0, hi20(val))); // auipc a0,<hi20>
+ break;
+ case R_RISCV_TLSDESC_CALL:
+ if (config->is64)
+ write32le(loc, itype(LD, X_A0, X_A0, lo12(val))); // ld a0,<lo12>(a0)
+ else
+ write32le(loc, itype(LW, X_A0, X_A0, lo12(val))); // lw a0,<lo12>(a0)
+ break;
+ default:
+ llvm_unreachable("unsupported relocation for TLSDESC to IE");
+ }
+}
+
+static void tlsdescToLe(uint8_t *loc, const Relocation &rel, uint64_t val) {
+ switch (rel.type) {
+ case R_RISCV_TLSDESC_HI20:
+ case R_RISCV_TLSDESC_LOAD_LO12:
+ write32le(loc, 0x00000013); // nop
+ return;
+ case R_RISCV_TLSDESC_ADD_LO12:
+ if (isInt<12>(val))
+ write32le(loc, 0x00000013); // nop
+ else
+ write32le(loc, utype(LUI, X_A0, hi20(val))); // lui a0,<hi20>
+ return;
+ case R_RISCV_TLSDESC_CALL:
+ if (isInt<12>(val))
+ write32le(loc, itype(ADDI, X_A0, 0, val)); // addi a0,zero,<lo12>
+ else
+ write32le(loc, itype(ADDI, X_A0, X_A0, lo12(val))); // addi a0,a0,<lo12>
+ return;
+ default:
+ llvm_unreachable("unsupported relocation for TLSDESC to LE");
+ }
+}
+
void RISCV::relocateAlloc(InputSectionBase &sec, uint8_t *buf) const {
uint64_t secAddr = sec.getOutputSection()->addr;
if (auto *s = dyn_cast<InputSection>(&sec))
secAddr += s->outSecOff;
else if (auto *ehIn = dyn_cast<EhInputSection>(&sec))
secAddr += ehIn->getParent()->outSecOff;
+ uint64_t tlsdescVal = 0;
+ bool tlsdescRelax = false, isToLe = false;
const ArrayRef<Relocation> relocs = sec.relocs();
for (size_t i = 0, size = relocs.size(); i != size; ++i) {
const Relocation &rel = relocs[i];
uint8_t *loc = buf + rel.offset;
- const uint64_t val =
+ uint64_t val =
sec.getRelocTargetVA(sec.file, rel.type, rel.addend,
secAddr + rel.offset, *rel.sym, rel.expr);
switch (rel.expr) {
case R_RELAX_HINT:
+ continue;
+ case R_TLSDESC_PC:
+ // For R_RISCV_TLSDESC_HI20, store &got(sym)-PC to be used by the
+ // following two instructions L[DW] and ADDI.
+ if (rel.type == R_RISCV_TLSDESC_HI20)
+ tlsdescVal = val;
+ else
+ val = tlsdescVal;
break;
+ case R_RELAX_TLS_GD_TO_IE:
+ // Only R_RISCV_TLSDESC_HI20 reaches here. tlsdescVal will be finalized
+ // after we see R_RISCV_TLSDESC_ADD_LO12 in the R_RELAX_TLS_GD_TO_LE case.
+ // The net effect is that tlsdescVal will be smaller than `val` to take
+ // into account of NOP instructions (in the absence of R_RISCV_RELAX)
+ // before AUIPC.
+ tlsdescVal = val + rel.offset;
+ isToLe = false;
+ tlsdescRelax = relaxable(relocs, i);
+ if (!tlsdescRelax)
+ tlsdescToIe(loc, rel, val);
+ continue;
+ case R_RELAX_TLS_GD_TO_LE:
+ // See the comment in handleTlsRelocation. For TLSDESC=>IE,
+ // R_RISCV_TLSDESC_{LOAD_LO12,ADD_LO12,CALL} also reach here. If isToIe is
+ // true, this is actually TLSDESC=>IE optimization.
+ if (rel.type == R_RISCV_TLSDESC_HI20) {
+ tlsdescVal = val;
+ isToLe = true;
+ tlsdescRelax = relaxable(relocs, i);
+ } else {
+ if (!isToLe && rel.type == R_RISCV_TLSDESC_ADD_LO12)
+ tlsdescVal -= rel.offset;
+ val = tlsdescVal;
+ }
+ // When NOP conversion is eligible and relaxation applies, don't write a
+ // NOP in case an unrelated instruction follows the current instruction.
+ if (tlsdescRelax &&
+ (rel.type == R_RISCV_TLSDESC_HI20 ||
+ rel.type == R_RISCV_TLSDESC_LOAD_LO12 ||
+ (rel.type == R_RISCV_TLSDESC_ADD_LO12 && isToLe && !hi20(val))))
+ continue;
+ if (isToLe)
+ tlsdescToLe(loc, rel, val);
+ else
+ tlsdescToIe(loc, rel, val);
+ continue;
case R_RISCV_LEB128:
if (i + 1 < size) {
const Relocation &rel1 = relocs[i + 1];
@@ -579,9 +689,9 @@ void RISCV::relocateAlloc(InputSectionBase &sec, uint8_t *buf) const {
": R_RISCV_SET_ULEB128 not paired with R_RISCV_SUB_SET128");
return;
default:
- relocate(loc, rel, val);
break;
}
+ relocate(loc, rel, val);
}
}
@@ -725,6 +835,7 @@ static bool relax(InputSection &sec) {
bool changed = false;
ArrayRef<SymbolAnchor> sa = ArrayRef(aux.anchors);
uint64_t delta = 0;
+ bool tlsdescRelax = false, toLeShortForm = false;
std::fill_n(aux.relocTypes.get(), relocs.size(), R_RISCV_NONE);
aux.writes.clear();
@@ -765,6 +876,21 @@ static bool relax(InputSection &sec) {
if (relaxable(relocs, i))
relaxHi20Lo12(sec, i, loc, r, remove);
break;
+ case R_RISCV_TLSDESC_HI20:
+ // For TLSDESC=>LE, we can use the short form if hi20 is zero.
+ tlsdescRelax = relaxable(relocs, i);
+ toLeShortForm = tlsdescRelax && r.expr == R_RELAX_TLS_GD_TO_LE &&
+ !hi20(r.sym->getVA(r.addend));
+ [[fallthrough]];
+ case R_RISCV_TLSDESC_LOAD_LO12:
+ // For TLSDESC=>LE/IE, AUIPC and L[DW] are removed if relaxable.
+ if (tlsdescRelax && r.expr != R_TLSDESC_PC)
+ remove = 4;
+ break;
+ case R_RISCV_TLSDESC_ADD_LO12:
+ if (toLeShortForm)
+ remove = 4;
+ break;
}
// For all anchors whose offsets are <= r.offset, they are preceded by
diff --git a/lld/ELF/Relocations.cpp b/lld/ELF/Relocations.cpp
index 3490a701d7189f..79c8230724ade7 100644
--- a/lld/ELF/Relocations.cpp
+++ b/lld/ELF/Relocations.cpp
@@ -1274,12 +1274,16 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
if (config->emachine == EM_MIPS)
return handleMipsTlsRelocation(type, sym, c, offset, addend, expr);
+ bool isRISCV = config->emachine == EM_RISCV;
if (oneof<R_AARCH64_TLSDESC_PAGE, R_TLSDESC, R_TLSDESC_CALL, R_TLSDESC_PC,
R_TLSDESC_GOTPLT>(expr) &&
config->shared) {
+ // R_RISCV_TLSDESC_{LOAD_LO12,ADD_LO12_I,CALL} reference a label. Do not
+ // set NEEDS_TLSDESC on the label.
if (expr != R_TLSDESC_CALL) {
- sym.setFlags(NEEDS_TLSDESC);
+ if (!isRISCV || type == R_RISCV_TLSDESC_HI20)
+ sym.setFlags(NEEDS_TLSDESC);
c.addReloc({expr, type, offset, addend, &sym});
}
return 1;
@@ -1287,12 +1291,14 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
// ARM, Hexagon, LoongArch and RISC-V do not support GD/LD to IE/LE
// optimizations.
+ // RISC-V supports TLSDESC to IE/LE optimizations.
// For PPC64, if the file has missing R_PPC64_TLSGD/R_PPC64_TLSLD, disable
// optimization as well.
bool execOptimize =
!config->shared && config->emachine != EM_ARM &&
config->emachine != EM_HEXAGON && config->emachine != EM_LOONGARCH &&
- config->emachine != EM_RISCV && !c.file->ppc64DisableTLSRelax;
+ !(isRISCV && expr != R_TLSDESC_PC && expr != R_TLSDESC_CALL) &&
+ !c.file->ppc64DisableTLSRelax;
// If we are producing an executable and the symbol is non-preemptable, it
// must be defined and the code sequence can be optimized to use Local-Exec.
@@ -1349,6 +1355,10 @@ static unsigned handleTlsRelocation(RelType type, Symbol &sym,
// Global-Dynamic/TLSDESC can be optimized to Initial-Exec or Local-Exec
// depending on the symbol being locally defined or not.
+ //
+ // R_RISCV_TLSDESC_{LOAD_LO12,ADD_LO12_I,CALL} reference a non-preemptible
+ // label, so the LE optimization will be categorized as
+ // R_RELAX_TLS_GD_TO_LE. We fix the categorization in RISCV::relocateAlloc.
if (sym.isPreemptible) {
sym.setFlags(NEEDS_TLSGD_TO_IE);
c.addReloc({target->adjustTlsExpr(type, R_RELAX_TLS_GD_TO_IE), type,
diff --git a/lld/test/ELF/riscv-tlsdesc-gd-mixed.s b/lld/test/ELF/riscv-tlsdesc-gd-mixed.s
new file mode 100644
index 00000000000000..c0e91593ed9686
--- /dev/null
+++ b/lld/test/ELF/riscv-tlsdesc-gd-mixed.s
@@ -0,0 +1,26 @@
+# REQUIRES: riscv
+# RUN: llvm-mc -filetype=obj -triple=riscv64 %s -o %t.o
+# RUN: ld.lld -shared %t.o -o %t.so
+# RUN: llvm-readobj -r %t.so | FileCheck %s --check-prefix=RELA
+
+## Both TLSDESC and DTPMOD64/DTPREL64 should be present.
+# RELA: .rela.dyn {
+# RELA-NEXT: 0x[[#%X,ADDR:]] R_RISCV_TLSDESC a 0x0
+# RELA-NEXT: 0x[[#ADDR+16]] R_RISCV_TLS_DTPMOD64 a 0x0
+# RELA-NEXT: 0x[[#ADDR+24]] R_RISCV_TLS_DTPREL64 a 0x0
+# RELA-NEXT: }
+
+ la.tls.gd a0,a
+ call __tls_get_addr at plt
+
+.Ltlsdesc_hi0:
+ auipc a2, %tlsdesc_hi(a)
+ ld a3, %tlsdesc_load_lo(.Ltlsdesc_hi0)(a2)
+ addi a0, a2, %tlsdesc_add_lo(.Ltlsdesc_hi0)
+ jalr t0, 0(a3), %tlsdesc_call(.Ltlsdesc_hi0)
+
+.section .tbss,"awT", at nobits
+.globl a
+.zero 8
+a:
+.zero 4
diff --git a/lld/test/ELF/riscv-tlsdesc-relax.s b/lld/test/ELF/riscv-tlsdesc-relax.s
new file mode 100644
index 00000000000000..fb24317e6535ca
--- /dev/null
+++ b/lld/test/ELF/riscv-tlsdesc-relax.s
@@ -0,0 +1,189 @@
+# REQUIRES: riscv
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: llvm-mc -filetype=obj -triple=riscv64 --defsym PAD=0 -mattr=+c,+relax a.s -o a.64.o
+# RUN: llvm-mc -filetype=obj -triple=riscv64 --defsym PAD=5000 -mattr=+c,+relax a.s -o aa.64.o
+# RUN: llvm-mc -filetype=obj -triple=riscv64 -mattr=+c,+relax c.s -o c.64.o
+# RUN: ld.lld -shared -soname=c.64.so c.64.o -o c.64.so
+
+# RUN: ld.lld -shared -z now a.64.o c.64.o -o a.64.so -z separate-code
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d a.64.so | FileCheck %s --check-prefix=GD64
+
+## Test the TLSDESC to LE optimization. Also check --emit-relocs.
+# RUN: ld.lld -e 0 -z now a.64.o c.64.o -o a.64.le -z separate-code --emit-relocs
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -hdr a.64.le | FileCheck %s --check-prefix=LE64
+# RUN: ld.lld -e 0 -z now aa.64.o c.64.o -o aa.64.le -z separate-code
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d aa.64.le | FileCheck %s --check-prefix=LE64A
+
+## Test the TLSDESC to IE optimization.
+# RUN: ld.lld -e 0 -z now a.64.o c.64.so -o a.64.ie -z separate-code
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d a.64.ie | FileCheck %s --check-prefix=IE64
+
+# GD64: .got 00000018 00000000000020c0
+# GD64-LABEL: <_start>:
+# GD64-NEXT: jal {{.*}} <foo>
+# GD64-LABEL: <foo>:
+## &.got[c]-. = 0x20c0+8 - 0x1004 = 0x10c4
+# GD64: 1004: auipc a2, 0x1
+# GD64-NEXT: c.add a7, a7
+# GD64-NEXT: ld a3, 0xc4(a2)
+# GD64-NEXT: c.add a7, a7
+# GD64-NEXT: addi a0, a2, 0xc4
+# GD64-NEXT: c.add a7, a7
+# GD64-NEXT: jalr t0, 0x0(a3)
+# GD64-NEXT: c.add a0, tp
+# GD64-NEXT: jal {{.*}} <foo>
+## &.got[c]-. = 0x20c0+8 - 0x1020 = 0x10a8
+# GD64-NEXT: 1020: auipc a4, 0x1
+# GD64-NEXT: ld a5, 0xa8(a4)
+# GD64-NEXT: addi a0, a4, 0xa8
+# GD64-NEXT: jalr t0, 0x0(a5)
+# GD64-NEXT: c.add a0, tp
+## &.got[c]-. = 0x20c0+8 - 0x1032 = 0x1096
+# GD64-NEXT: 1032: auipc a6, 0x1
+# GD64-NEXT: ld a7, 0x96(a6)
+# GD64-NEXT: addi a0, a6, 0x96
+# GD64-NEXT: jalr t0, 0x0(a7)
+# GD64-NEXT: c.add a0, tp
+
+# LE64-LABEL: <_start>:
+# LE64-NEXT: jal {{.*}} <foo>
+# LE64-LABEL: <foo>:
+# LE64-NEXT: c.add a7, a7
+# LE64-NEXT: R_RISCV_TLSDESC_HI20 b
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: c.add a7, a7
+# LE64-NEXT: R_RISCV_TLSDESC_LOAD_LO12 .Ltlsdesc_hi0
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: 11008: c.add a7, a7
+# LE64-NEXT: R_RISCV_TLSDESC_ADD_LO12 .Ltlsdesc_hi0
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: addi a0, zero, 0x7ff
+# LE64-NEXT: R_RISCV_TLSDESC_CALL .Ltlsdesc_hi0
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: c.add a0, tp
+# LE64-NEXT: jal {{.*}} <foo>
+# LE64-NEXT: R_RISCV_JAL foo
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: addi a0, zero, 0x7ff
+# LE64-NEXT: R_RISCV_TLSDESC_HI20 b
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: R_RISCV_TLSDESC_LOAD_LO12 .Ltlsdesc_hi1
+# LE64-NEXT: R_RISCV_TLSDESC_ADD_LO12 .Ltlsdesc_hi1
+# LE64-NEXT: R_RISCV_TLSDESC_CALL .Ltlsdesc_hi1
+# LE64-NEXT: c.add a0, tp
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: R_RISCV_TLSDESC_HI20 b
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: R_RISCV_TLSDESC_LOAD_LO12 .Ltlsdesc_hi2
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: R_RISCV_TLSDESC_ADD_LO12 .Ltlsdesc_hi2
+# LE64-NEXT: R_RISCV_RELAX *ABS*
+# LE64-NEXT: addi a0, zero, 0x7ff
+# LE64-NEXT: R_RISCV_TLSDESC_CALL .Ltlsdesc_hi2
+# LE64-NEXT: c.add a0, tp
+
+# LE64A-LABEL: <_start>:
+# LE64A-NEXT: jal {{.*}} <foo>
+# LE64A-LABEL: <foo>:
+# LE64A-NEXT: c.add a7, a7
+# LE64A-NEXT: c.add a7, a7
+# LE64A-NEXT: 11008: lui a0, 0x2
+# LE64A-NEXT: c.add a7, a7
+# LE64A-NEXT: addi a0, a0, -0x479
+# LE64A-NEXT: c.add a0, tp
+# LE64A-NEXT: jal {{.*}} <foo>
+# LE64A-NEXT: lui a0, 0x2
+# LE64A-NEXT: addi a0, a0, -0x479
+# LE64A-NEXT: c.add a0, tp
+# LE64A-NEXT: addi zero, zero, 0x0
+# LE64A-NEXT: addi zero, zero, 0x0
+# LE64A-NEXT: lui a0, 0x2
+# LE64A-NEXT: addi a0, a0, -0x479
+# LE64A-NEXT: c.add a0, tp
+
+# IE64: .got 00000010 00000000000120e0
+# IE64-LABEL: <_start>:
+# IE64-NEXT: jal {{.*}} <foo>
+# IE64-LABEL: <foo>:
+# IE64-NEXT: c.add a7, a7
+# IE64-NEXT: c.add a7, a7
+## &.got[c]-. = 0x120e0+8 - 0x11008 = 0x10e0
+# IE64-NEXT: 11008: auipc a0, 0x1
+# IE64-NEXT: c.add a7, a7
+# IE64-NEXT: ld a0, 0xe0(a0)
+# IE64-NEXT: c.add a0, tp
+# IE64-NEXT: jal {{.*}} <foo>
+## &.got[c]-. = 0x120e0+8 - 0x11018 = 0x10d0
+# IE64-NEXT: 11018: auipc a0, 0x1
+# IE64-NEXT: ld a0, 0xd0(a0)
+# IE64-NEXT: c.add a0, tp
+## &.got[c]-. = 0x120e0+8 - 0x1102a = 0x10be
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: 1102a: auipc a0, 0x1
+# IE64-NEXT: ld a0, 0xbe(a0)
+# IE64-NEXT: c.add a0, tp
+
+#--- a.s
+.globl _start
+_start:
+.balign 16
+ call foo
+
+foo:
+.Ltlsdesc_hi0:
+.option norelax
+## All 4 instructions have an R_RISCV_RELAX.
+## Check that optimization/relaxation are not affected by irrelevant instructions.
+ auipc a2, %tlsdesc_hi(b)
+ .reloc .-4, R_RISCV_RELAX, 0
+ c.add a7, a7
+ ld a3, %tlsdesc_load_lo(.Ltlsdesc_hi0)(a2)
+ .reloc .-4, R_RISCV_RELAX, 0
+ c.add a7, a7
+ addi a0, a2, %tlsdesc_add_lo(.Ltlsdesc_hi0)
+ .reloc .-4, R_RISCV_RELAX, 0
+ c.add a7, a7
+ jalr t0, 0(a3), %tlsdesc_call(.Ltlsdesc_hi0)
+ .reloc .-4, R_RISCV_RELAX, 0
+ add a0, a0, tp
+.option relax
+
+ call foo
+
+.Ltlsdesc_hi1:
+.option norelax
+## AUIPC has an R_RISCV_RELAX. We perform relaxation, ignoring whether other
+## instructions have R_RISCV_RELAX.
+ auipc a4, %tlsdesc_hi(b)
+ .reloc .-4, R_RISCV_RELAX, 0
+ ld a5, %tlsdesc_load_lo(.Ltlsdesc_hi1)(a4)
+ addi a0, a4, %tlsdesc_add_lo(.Ltlsdesc_hi1)
+ jalr t0, 0(a5), %tlsdesc_call(.Ltlsdesc_hi1)
+ add a0, a0, tp
+.option relax
+
+.Ltlsdesc_hi2:
+.option norelax
+## AUIPC does not have R_RISCV_RELAX. No relaxation.
+ auipc a6, %tlsdesc_hi(b)
+ ld a7, %tlsdesc_load_lo(.Ltlsdesc_hi2)(a6)
+ .reloc .-4, R_RISCV_RELAX, 0
+ addi a0, a6, %tlsdesc_add_lo(.Ltlsdesc_hi2)
+ .reloc .-4, R_RISCV_RELAX, 0
+ jalr t0, 0(a7), %tlsdesc_call(.Ltlsdesc_hi2)
+ add a0, a0, tp
+.option relax
+
+.section .tbss
+.globl a
+.zero 8
+a:
+.zero 2039+PAD ## Place b at 0x7ff+PAD
+
+#--- c.s
+.tbss
+.globl b
+b:
+.zero 4
diff --git a/lld/test/ELF/riscv-tlsdesc.s b/lld/test/ELF/riscv-tlsdesc.s
new file mode 100644
index 00000000000000..1738f86256caa6
--- /dev/null
+++ b/lld/test/ELF/riscv-tlsdesc.s
@@ -0,0 +1,194 @@
+# REQUIRES: riscv
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: llvm-mc -filetype=obj -triple=riscv64 a.s -o a.64.o
+# RUN: llvm-mc -filetype=obj -triple=riscv64 c.s -o c.64.o
+# RUN: ld.lld -shared -soname=c.64.so c.64.o -o c.64.so
+# RUN: llvm-mc -filetype=obj -triple=riscv32 --defsym ELF32=1 a.s -o a.32.o
+# RUN: llvm-mc -filetype=obj -triple=riscv32 --defsym ELF32=1 c.s -o c.32.o
+# RUN: ld.lld -shared -soname=c.32.so c.32.o -o c.32.so
+
+# RUN: ld.lld -shared -z now a.64.o c.64.o -o a.64.so
+# RUN: llvm-readobj -r -x .got a.64.so | FileCheck --check-prefix=GD64-RELA %s
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d a.64.so | FileCheck %s --check-prefix=GD64
+
+# RUN: ld.lld -shared -z now a.64.o c.64.o -o rel.64.so -z rel
+# RUN: llvm-readobj -r -x .got rel.64.so | FileCheck --check-prefix=GD64-REL %s
+
+# RUN: ld.lld -e 0 -z now a.64.o c.64.o -o a.64.le
+# RUN: llvm-readelf -r a.64.le | FileCheck --check-prefix=NOREL %s
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d a.64.le | FileCheck %s --check-prefix=LE64
+
+# RUN: ld.lld -e 0 -z now a.64.o c.64.so -o a.64.ie
+# RUN: llvm-readobj -r a.64.ie | FileCheck --check-prefix=IE64-RELA %s
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d a.64.ie | FileCheck %s --check-prefix=IE64
+
+## 32-bit code is mostly the same. We only test a few variants. The IE optimization uses the LW instruction.
+
+# RUN: ld.lld -shared -z now a.32.o c.32.o -o rel.32.so -z rel
+# RUN: llvm-readobj -r -x .got rel.32.so | FileCheck --check-prefix=GD32-REL %s
+# RUN: ld.lld -e 0 -z now a.32.o c.32.so -o a.32.ie
+# RUN: llvm-objdump --no-show-raw-insn -M no-aliases -h -d a.32.ie | FileCheck %s --check-prefix=IE32
+
+# GD64-RELA: .rela.dyn {
+# GD64-RELA-NEXT: 0x2408 R_RISCV_TLSDESC - 0x7FF
+# GD64-RELA-NEXT: 0x23E8 R_RISCV_TLSDESC a 0x0
+# GD64-RELA-NEXT: 0x23F8 R_RISCV_TLSDESC c 0x0
+# GD64-RELA-NEXT: }
+# GD64-RELA: Hex dump of section '.got':
+# GD64-RELA-NEXT: 0x000023e0 20230000 00000000 00000000 00000000 #
+# GD64-RELA-NEXT: 0x000023f0 00000000 00000000 00000000 00000000 .
+
+# GD64-REL: .rel.dyn {
+# GD64-REL-NEXT: 0x23F0 R_RISCV_TLSDESC -
+# GD64-REL-NEXT: 0x23D0 R_RISCV_TLSDESC a
+# GD64-REL-NEXT: 0x23E0 R_RISCV_TLSDESC c
+# GD64-REL-NEXT: }
+# GD64-REL: Hex dump of section '.got':
+# GD64-REL-NEXT: 0x000023c8 08230000 00000000 00000000 00000000 .
+# GD64-REL-NEXT: 0x000023d8 00000000 00000000 00000000 00000000 .
+# GD64-REL-NEXT: 0x000023e8 00000000 00000000 00000000 00000000 .
+# GD64-REL-NEXT: 0x000023f8 ff070000 00000000 .
+
+# GD32-REL: .rel.dyn {
+# GD32-REL-NEXT: 0x2274 R_RISCV_TLSDESC -
+# GD32-REL-NEXT: 0x2264 R_RISCV_TLSDESC a
+# GD32-REL-NEXT: 0x226C R_RISCV_TLSDESC c
+# GD32-REL-NEXT: }
+# GD32-REL: Hex dump of section '.got':
+# GD32-REL-NEXT: 0x00002260 00220000 00000000 00000000 00000000 .
+# GD32-REL-NEXT: 0x00002270 00000000 00000000 ff070000 .
+
+# GD64: .got 00000038 00000000000023e0
+
+## &.got[a]-. = 0x23e0+8 - 0x12e0 = 0x1108
+# GD64: 12e0: auipc a0, 0x1
+# GD64-NEXT: ld a1, 0x108(a0)
+# GD64-NEXT: addi a0, a0, 0x108
+# GD64-NEXT: jalr t0, 0x0(a1)
+# GD64-NEXT: add a0, a0, tp
+
+## &.got[b]-. = 0x23e0+40 - 0x12f4 = 0x1114
+# GD64-NEXT: 12f4: auipc a2, 0x1
+# GD64-NEXT: ld a3, 0x114(a2)
+# GD64-NEXT: addi a0, a2, 0x114
+# GD64-NEXT: jalr t0, 0x0(a3)
+# GD64-NEXT: add a0, a0, tp
+
+## &.got[c]-. = 0x23e0+24 - 0x1308 = 0x10f0
+# GD64-NEXT: 1308: auipc a4, 0x1
+# GD64-NEXT: ld a5, 0xf0(a4)
+# GD64-NEXT: addi a0, a4, 0xf0
+# GD64-NEXT: jalr t0, 0x0(a5)
+# GD64-NEXT: add a0, a0, tp
+
+# NOREL: no relocations
+
+# LE64-LABEL: <.text>:
+## st_value(a) = 8
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi a0, zero, 0x8
+# LE64-NEXT: add a0, a0, tp
+## st_value(b) = 2047
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi a0, zero, 0x7ff
+# LE64-NEXT: add a0, a0, tp
+## st_value(c) = 2048
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: addi zero, zero, 0x0
+# LE64-NEXT: lui a0, 0x1
+# LE64-NEXT: addi a0, a0, -0x800
+# LE64-NEXT: add a0, a0, tp
+
+# IE64-RELA: .rela.dyn {
+# IE64-RELA-NEXT: 0x123B0 R_RISCV_TLS_TPREL64 c 0x0
+# IE64-RELA-NEXT: }
+
+# IE64: .got 00000010 00000000000123a8
+
+## a and b are optimized to use LE. c is optimized to IE.
+# IE64-LABEL: <.text>:
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi a0, zero, 0x8
+# IE64-NEXT: add a0, a0, tp
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi a0, zero, 0x7ff
+# IE64-NEXT: add a0, a0, tp
+## &.got[c]-. = 0x123a8+8 - 0x112b8 = 0x10f8
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: addi zero, zero, 0x0
+# IE64-NEXT: 112b8: auipc a0, 0x1
+# IE64-NEXT: ld a0, 0xf8(a0)
+# IE64-NEXT: add a0, a0, tp
+
+# IE32: .got 00000008 00012248
+
+# IE32-LABEL: <.text>:
+## st_value(a) = 8
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi a0, zero, 0x8
+# IE32-NEXT: add a0, a0, tp
+## st_value(b) = 2047
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi a0, zero, 0x7ff
+# IE32-NEXT: add a0, a0, tp
+## &.got[c]-. = 0x12248+4 - 0x111cc = 0x1080
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: addi zero, zero, 0x0
+# IE32-NEXT: 111cc: auipc a0, 0x1
+# IE32-NEXT: lw a0, 0x80(a0)
+# IE32-NEXT: add a0, a0, tp
+
+#--- a.s
+.macro load dst, src
+.ifdef ELF32
+lw \dst, \src
+.else
+ld \dst, \src
+.endif
+.endm
+
+.Ltlsdesc_hi0:
+ auipc a0, %tlsdesc_hi(a)
+ load a1, %tlsdesc_load_lo(.Ltlsdesc_hi0)(a0)
+ addi a0, a0, %tlsdesc_add_lo(.Ltlsdesc_hi0)
+ jalr t0, 0(a1), %tlsdesc_call(.Ltlsdesc_hi0)
+ add a0, a0, tp
+
+.Ltlsdesc_hi1:
+ auipc a2, %tlsdesc_hi(b)
+ load a3, %tlsdesc_load_lo(.Ltlsdesc_hi1)(a2)
+ addi a0, a2, %tlsdesc_add_lo(.Ltlsdesc_hi1)
+ jalr t0, 0(a3), %tlsdesc_call(.Ltlsdesc_hi1)
+ add a0, a0, tp
+
+.Ltlsdesc_hi2:
+ auipc a4, %tlsdesc_hi(c)
+ load a5, %tlsdesc_load_lo(.Ltlsdesc_hi2)(a4)
+ addi a0, a4, %tlsdesc_add_lo(.Ltlsdesc_hi2)
+ jalr t0, 0(a5), %tlsdesc_call(.Ltlsdesc_hi2)
+ add a0, a0, tp
+
+.section .tbss
+.globl a
+.zero 8
+a:
+.zero 2039 ## Place b at 0x7ff
+b:
+.zero 1
+
+#--- c.s
+.tbss
+.globl c
+c: .zero 4
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