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[lld][LoongArch] Relax TLSDESC code sequence (#123677)
Relax TLSDESC code sequence. Original code sequence: * pcalau12i $a0, %desc_pc_hi20(sym_desc) * addi.d $a0, $a0, %desc_pc_lo12(sym_desc) * ld.d $ra, $a0, %desc_ld(sym_desc) * jirl $ra, $ra, %desc_call(sym_desc) Cannot convert to LE/IE, but relax: * pcaddi $a0, %desc_pcrel_20(sym_desc) * ld.d $ra, $a0, %desc_ld(sym_desc) * jirl $ra, $ra, %desc_call(sym_desc) TODO: The transition from TLSDESC GD/LD to IE/LE will implement in a future patch.
This commit is contained in:
Zhaoxin Yang
GitHub
parent
9d61eaa9ec
commit
0ec94983c4
@ -766,9 +766,12 @@ static bool isPairRelaxable(ArrayRef<Relocation> relocs, size_t i) {
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// Relax code sequence.
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// From:
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// pcalau12i $a0, %pc_hi20(sym) | %ld_pc_hi20(sym) | %gd_pc_hi20(sym)
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// | %desc_pc_hi20(sym)
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// addi.w/d $a0, $a0, %pc_lo12(sym) | %got_pc_lo12(sym) | %got_pc_lo12(sym)
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// | %desc_pc_lo12(sym)
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// To:
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// pcaddi $a0, %pc_lo12(sym) | %got_pc_lo12(sym) | %got_pc_lo12(sym)
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// pcaddi $a0, %pc_lo12(sym) | %got_pc_lo12(sym) | %got_pc_lo12(sym)
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// | %desc_pcrel_20(sym)
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//
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// From:
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// pcalau12i $a0, %got_pc_hi20(sym_got)
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@ -786,7 +789,9 @@ static void relaxPCHi20Lo12(Ctx &ctx, const InputSection &sec, size_t i,
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(rHi20.type == R_LARCH_TLS_GD_PC_HI20 &&
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rLo12.type == R_LARCH_GOT_PC_LO12) ||
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(rHi20.type == R_LARCH_TLS_LD_PC_HI20 &&
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rLo12.type == R_LARCH_GOT_PC_LO12)))
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rLo12.type == R_LARCH_GOT_PC_LO12) ||
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(rHi20.type == R_LARCH_TLS_DESC_PC_HI20 &&
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rLo12.type == R_LARCH_TLS_DESC_PC_LO12)))
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return;
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// GOT references to absolute symbols can't be relaxed to use pcaddi in
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@ -808,6 +813,8 @@ static void relaxPCHi20Lo12(Ctx &ctx, const InputSection &sec, size_t i,
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dest = rHi20.sym->getVA(ctx);
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else if (rHi20.expr == RE_LOONGARCH_TLSGD_PAGE_PC)
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dest = ctx.in.got->getGlobalDynAddr(*rHi20.sym);
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else if (rHi20.expr == RE_LOONGARCH_TLSDESC_PAGE_PC)
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dest = ctx.in.got->getTlsDescAddr(*rHi20.sym);
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else {
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Err(ctx) << getErrorLoc(ctx, (const uint8_t *)loc) << "unknown expr ("
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<< rHi20.expr << ") against symbol " << rHi20.sym
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@ -841,6 +848,8 @@ static void relaxPCHi20Lo12(Ctx &ctx, const InputSection &sec, size_t i,
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sec.relaxAux->relocTypes[i + 2] = R_LARCH_TLS_GD_PCREL20_S2;
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else if (rHi20.type == R_LARCH_TLS_LD_PC_HI20)
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sec.relaxAux->relocTypes[i + 2] = R_LARCH_TLS_LD_PCREL20_S2;
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else if (rHi20.type == R_LARCH_TLS_DESC_PC_HI20)
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sec.relaxAux->relocTypes[i + 2] = R_LARCH_TLS_DESC_PCREL20_S2;
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else
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sec.relaxAux->relocTypes[i + 2] = R_LARCH_PCREL20_S2;
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sec.relaxAux->writes.push_back(insn(PCADDI, getD5(nextInsn), 0, 0));
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@ -947,6 +956,7 @@ static bool relax(Ctx &ctx, InputSection &sec) {
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case R_LARCH_GOT_PC_HI20:
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case R_LARCH_TLS_GD_PC_HI20:
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case R_LARCH_TLS_LD_PC_HI20:
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case R_LARCH_TLS_DESC_PC_HI20:
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// The overflow check for i+2 will be carried out in isPairRelaxable.
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if (isPairRelaxable(relocs, i))
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relaxPCHi20Lo12(ctx, sec, i, loc, r, relocs[i + 2], remove);
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@ -1081,6 +1091,11 @@ void LoongArch::finalizeRelax(int passes) const {
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write32le(p, aux.writes[writesIdx++]);
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r.expr = R_TLSGD_PC;
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break;
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case R_LARCH_TLS_DESC_PCREL20_S2:
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skip = 4;
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write32le(p, aux.writes[writesIdx++]);
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r.expr = R_TLSDESC_PC;
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break;
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default:
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llvm_unreachable("unsupported type");
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}
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280
lld/test/ELF/loongarch-relax-tlsdesc.s
Normal file
280
lld/test/ELF/loongarch-relax-tlsdesc.s
Normal file
@ -0,0 +1,280 @@
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# REQUIRES: loongarch
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# RUN: rm -rf %t && split-file %s %t && cd %t
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# RUN: llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.64.o
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# RUN: llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax c.s -o c.64.o
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# RUN: ld.lld --relax -shared -soname=c.64.so c.64.o -o c.64.so
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## Test the TLSDESC relaxation.
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# RUN: ld.lld --relax -shared -z now a.64.o c.64.o -o a.64.so
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# RUN: llvm-readobj -r -x .got a.64.so | FileCheck --check-prefix=GD64-RELA %s
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# RUN: llvm-objdump --no-show-raw-insn -dr -h a.64.so | FileCheck %s --check-prefix=GD64
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## FIXME: The transition from TLSDESC to IE/LE has not yet been implemented.
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## Keep the dynamic relocations and hand them over to dynamic linker.
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# RUN: ld.lld --relax -e 0 -z now a.64.o c.64.o -o a.64.le
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# RUN: llvm-readobj -r -x .got a.64.le | FileCheck --check-prefix=LE64-RELA %s
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# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.le | FileCheck %s --check-prefix=LE64
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# RUN: ld.lld --no-relax -e 0 -z now a.64.o c.64.o -o a.64.le.norelax
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# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.le.norelax | FileCheck %s --check-prefix=LE64-NORELAX
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# RUN: ld.lld --relax -e 0 -z now a.64.o c.64.so -o a.64.ie
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# RUN: llvm-readobj -r -x .got a.64.ie | FileCheck --check-prefix=IE64-RELA %s
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# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.ie | FileCheck %s --check-prefix=IE64
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# RUN: ld.lld --no-relax -e 0 -z now a.64.o c.64.so -o a.64.ie.norelax
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# RUN: llvm-objdump --no-show-raw-insn -d -h a.64.ie.norelax | FileCheck %s --check-prefix=IE64-NORELAX
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# GD64-RELA: .rela.dyn {
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# GD64-RELA-NEXT: 0x20460 R_LARCH_TLS_DESC64 - 0x7FF
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# GD64-RELA-NEXT: 0x20430 R_LARCH_TLS_DESC64 a 0x0
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# GD64-RELA-NEXT: 0x20440 R_LARCH_TLS_DESC64 c 0x0
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# GD64-RELA-NEXT: 0x20450 R_LARCH_TLS_DESC64 d 0x0
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# GD64-RELA-NEXT: }
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# GD64-RELA: Hex dump of section '.got':
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# GD64-RELA-NEXT: 0x00020430 00000000 00000000 00000000 00000000 .
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# GD64-RELA-NEXT: 0x00020440 00000000 00000000 00000000 00000000 .
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# GD64-RELA-NEXT: 0x00020450 00000000 00000000 00000000 00000000 .
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# GD64-RELA-NEXT: 0x00020460 00000000 00000000 00000000 00000000 .
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# GD64: .got 00000040 0000000000020430
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## &.got[a]-. = 0x20430 - 0x10318 = 16454<<2
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# GD64: 10318: pcaddi $a0, 16454
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# GD64-NEXT: ld.d $ra, $a0, 0
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# GD64-NEXT: jirl $ra, $ra, 0
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# GD64-NEXT: add.d $a1, $a0, $tp
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## &.got[b]-. = 0x20430+48 - 0x10328: 0x10 pages, page offset 0x460
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## R_LARCH_RELAX does not appear in pairs. No relaxation.
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# GD64: 10328: pcalau12i $a0, 16
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# GD64-NEXT: addi.d $a0, $a0, 1120
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# GD64-NEXT: ld.d $ra, $a0, 0
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# GD64-NEXT: jirl $ra, $ra, 0
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# GD64-NEXT: add.d $a2, $a0, $tp
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## &.got[c]-. = 0x20430+16 - 0x1033c: 0x10 pages, page offset 0x440
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## Without R_LARCH_RELAX relocation. No relaxation.
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# GD64: 1033c: pcalau12i $a0, 16
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# GD64-NEXT: addi.d $t0, $zero, 0
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# GD64-NEXT: addi.d $a0, $a0, 1088
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# GD64-NEXT: addi.d $t0, $t0, 1
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# GD64-NEXT: ld.d $ra, $a0, 0
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# GD64-NEXT: addi.d $t0, $t0, 1
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# GD64-NEXT: jirl $ra, $ra, 0
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# GD64-NEXT: add.d $a3, $a0, $tp
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## &.got[d]-. = 0x20430+32 - 0x1035c = 16445<<2
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# GD64: 1035c: pcaddi $a0, 16445
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# GD64-NEXT: ld.d $ra, $a0, 0
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# GD64-NEXT: jirl $ra, $ra, 0
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# GD64-NEXT: add.d $a4, $a0, $tp
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# LE64-RELA: .rela.dyn {
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# LE64-RELA-NEXT: 0x30280 R_LARCH_TLS_DESC64 - 0x8
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# LE64-RELA-NEXT: 0x30290 R_LARCH_TLS_DESC64 - 0x800
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# LE64-RELA-NEXT: 0x302A0 R_LARCH_TLS_DESC64 - 0x1000
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# LE64-RELA-NEXT: 0x302B0 R_LARCH_TLS_DESC64 - 0x7FF
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# LE64-RELA-NEXT: }
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# LE64-RELA: Hex dump of section '.got':
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# LE64-RELA-NEXT: 0x00030280 00000000 00000000 00000000 00000000 .
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# LE64-RELA-NEXT: 0x00030290 00000000 00000000 00000000 00000000 .
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# LE64-RELA-NEXT: 0x000302a0 00000000 00000000 00000000 00000000 .
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# LE64-RELA-NEXT: 0x000302b0 00000000 00000000 00000000 00000000 .
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# LE64: .got 00000040 0000000000030280
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## &.got[a]-. = 0x30280 - 0x20228 = 16406<<2
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# LE64: 20228: pcaddi $a0, 16406
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# LE64-NEXT: ld.d $ra, $a0, 0
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# LE64-NEXT: jirl $ra, $ra, 0
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# LE64-NEXT: add.d $a1, $a0, $tp
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## &.got[b]-. = 0x30280+48 - 0x20238: 0x10 pages, page offset 0x2b0
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## R_LARCH_RELAX does not appear in pairs. No relaxation.
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# LE64: 20238: pcalau12i $a0, 16
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# LE64-NEXT: addi.d $a0, $a0, 688
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# LE64-NEXT: ld.d $ra, $a0, 0
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# LE64-NEXT: jirl $ra, $ra, 0
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# LE64-NEXT: add.d $a2, $a0, $tp
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## &.got[c]-. = 0x30280+16 - 0x2024c: 0x10 pages, page offset 0x290
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## Without R_LARCH_RELAX relocation. No relaxation.
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# LE64: 2024c: pcalau12i $a0, 16
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# LE64-NEXT: addi.d $t0, $zero, 0
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# LE64-NEXT: addi.d $a0, $a0, 656
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# LE64-NEXT: addi.d $t0, $t0, 1
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# LE64-NEXT: ld.d $ra, $a0, 0
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# LE64-NEXT: addi.d $t0, $t0, 1
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# LE64-NEXT: jirl $ra, $ra, 0
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# LE64-NEXT: add.d $a3, $a0, $tp
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## &.got[d]-. = 0x30280+32 - 0x2026c = 16397<<2
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# LE64: 2026c: pcaddi $a0, 16397
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# LE64-NEXT: ld.d $ra, $a0, 0
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# LE64-NEXT: jirl $ra, $ra, 0
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# LE64-NEXT: add.d $a4, $a0, $tp
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# LE64-NORELAX: .got 00000040 0000000000030288
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## &.got[a]-. = 0x30288 - 0x20228 = 0x10 pages, page offset 0x288
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# LE64-NORELAX: 20228: pcalau12i $a0, 16
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# LE64-NORELAX-NEXT: addi.d $a0, $a0, 648
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# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# LE64-NORELAX-NEXT: add.d $a1, $a0, $tp
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## &.got[b]-. = 0x30288+48 - 0x2023c: 0x10 pages, page offset 0x2b8
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## R_LARCH_RELAX does not appear in pairs. No relaxation.
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# LE64-NORELAX: 2023c: pcalau12i $a0, 16
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# LE64-NORELAX-NEXT: addi.d $a0, $a0, 696
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# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# LE64-NORELAX-NEXT: add.d $a2, $a0, $tp
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## &.got[c]-. = 0x30288+16 - 0x20250: 0x10 pages, page offset 0x298
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## Without R_LARCH_RELAX relocation. No relaxation.
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# LE64-NORELAX: 20250: pcalau12i $a0, 16
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# LE64-NORELAX-NEXT: addi.d $t0, $zero, 0
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# LE64-NORELAX-NEXT: addi.d $a0, $a0, 664
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# LE64-NORELAX-NEXT: addi.d $t0, $t0, 1
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# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# LE64-NORELAX-NEXT: addi.d $t0, $t0, 1
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# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# LE64-NORELAX-NEXT: add.d $a3, $a0, $tp
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## &.got[d]-. = 0x30288+32 - 0x20270: 0x10 pages, page offset 0x2a8
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# LE64-NORELAX: 20270: pcalau12i $a0, 16
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# LE64-NORELAX-NEXT: addi.d $a0, $a0, 680
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# LE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# LE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# LE64-NORELAX-NEXT: add.d $a4, $a0, $tp
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# IE64-RELA: .rela.dyn {
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# IE64-RELA-NEXT: 0x30430 R_LARCH_TLS_DESC64 - 0x8
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# IE64-RELA-NEXT: 0x30460 R_LARCH_TLS_DESC64 - 0x7FF
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# IE64-RELA-NEXT: 0x30440 R_LARCH_TLS_DESC64 c 0x0
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# IE64-RELA-NEXT: 0x30450 R_LARCH_TLS_DESC64 d 0x0
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# IE64-RELA-NEXT: }
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# IE64-RELA: Hex dump of section '.got':
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# IE64-RELA-NEXT: 0x00030430 00000000 00000000 00000000 00000000 .
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# IE64-RELA-NEXT: 0x00030440 00000000 00000000 00000000 00000000 .
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# IE64-RELA-NEXT: 0x00030450 00000000 00000000 00000000 00000000 .
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# IE64-RELA-NEXT: 0x00030460 00000000 00000000 00000000 00000000 .
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# IE64: .got 00000040 0000000000030430
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## a and b are optimized to use LE. c and d are optimized to IE.
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## &.got[a]-. = 0x30430 - 0x202f8 = 16462<<2
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# IE64: 202f8: pcaddi $a0, 16462
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# IE64-NEXT: ld.d $ra, $a0, 0
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# IE64-NEXT: jirl $ra, $ra, 0
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# IE64-NEXT: add.d $a1, $a0, $tp
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## &.got[b]-. = 0x30430+48 - 0x20308: 0x10 pages, page offset 0x460
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## R_LARCH_RELAX does not appear in pairs. No relaxation.
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# IE64: 20308: pcalau12i $a0, 16
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# IE64-NEXT: addi.d $a0, $a0, 1120
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# IE64-NEXT: ld.d $ra, $a0, 0
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# IE64-NEXT: jirl $ra, $ra, 0
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# IE64-NEXT: add.d $a2, $a0, $tp
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## &.got[c]-. = 0x30430+16 - 0x2031c: 0x10 pages, page offset 0x440
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## Without R_LARCH_RELAX relocation. No relaxation.
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# IE64: 2031c: pcalau12i $a0, 16
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# IE64-NEXT: addi.d $t0, $zero, 0
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# IE64-NEXT: addi.d $a0, $a0, 1088
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# IE64-NEXT: addi.d $t0, $t0, 1
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# IE64-NEXT: ld.d $ra, $a0, 0
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# IE64-NEXT: addi.d $t0, $t0, 1
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# IE64-NEXT: jirl $ra, $ra, 0
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# IE64-NEXT: add.d $a3, $a0, $tp
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## &.got[d]-. = 0x30430+32 - 0x2033c = 16453<<2
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# IE64: 2033c: pcaddi $a0, 16453
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# IE64-NEXT: ld.d $ra, $a0, 0
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# IE64-NEXT: jirl $ra, $ra, 0
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# IE64-NEXT: add.d $a4, $a0, $tp
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# IE64-NORELAX: .got 00000040 0000000000030438
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## &.got[a]-. = 0x30438 - 0x202f8 = 0x10 pages, page offset 0x438
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# IE64-NORELAX: 202f8: pcalau12i $a0, 16
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# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1080
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# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# IE64-NORELAX-NEXT: add.d $a1, $a0, $tp
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## &.got[b]-. = 0x30438+48 - 0x2030c: 0x10 pages, page offset 0x468
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## R_LARCH_RELAX does not appear in pairs. No relaxation.
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# IE64-NORELAX: 2030c: pcalau12i $a0, 16
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# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1128
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# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# IE64-NORELAX-NEXT: add.d $a2, $a0, $tp
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## &.got[c]-. = 0x30438+16 - 0x20320: 0x10 pages, page offset 0x448
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## Without R_LARCH_RELAX relocation. No relaxation.
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# IE64-NORELAX: 20320: pcalau12i $a0, 16
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# IE64-NORELAX-NEXT: addi.d $t0, $zero, 0
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# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1096
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# IE64-NORELAX-NEXT: addi.d $t0, $t0, 1
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# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
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# IE64-NORELAX-NEXT: addi.d $t0, $t0, 1
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# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
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# IE64-NORELAX-NEXT: add.d $a3, $a0, $tp
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|
||||
## &.got[d]-. = 0x30438+32 - 0x20340: 0x10 pages, page offset 0x458
|
||||
# IE64-NORELAX: 20340: pcalau12i $a0, 16
|
||||
# IE64-NORELAX-NEXT: addi.d $a0, $a0, 1112
|
||||
# IE64-NORELAX-NEXT: ld.d $ra, $a0, 0
|
||||
# IE64-NORELAX-NEXT: jirl $ra, $ra, 0
|
||||
# IE64-NORELAX-NEXT: add.d $a4, $a0, $tp
|
||||
|
||||
#--- a.s
|
||||
la.tls.desc $a0, a
|
||||
add.d $a1, $a0, $tp
|
||||
|
||||
# ADDI.D does not have R_LARCH_RELAX. No relaxation.
|
||||
pcalau12i $a0, %desc_pc_hi20(b)
|
||||
.reloc .-4, R_LARCH_RELAX, 0
|
||||
addi.d $a0, $a0, %desc_pc_lo12(b)
|
||||
ld.d $ra, $a0, %desc_ld(b)
|
||||
jirl $ra, $ra, %desc_call(b)
|
||||
add.d $a2, $a0, $tp
|
||||
|
||||
# TLSDESC to LE. No relaxation.
|
||||
pcalau12i $a0, %desc_pc_hi20(c)
|
||||
addi.d $t0, $zero, 0
|
||||
addi.d $a0, $a0, %desc_pc_lo12(c)
|
||||
addi.d $t0, $t0, 1
|
||||
ld.d $ra, $a0, %desc_ld(c)
|
||||
addi.d $t0, $t0, 1
|
||||
jirl $ra, $ra, %desc_call(c)
|
||||
add.d $a3, $a0, $tp
|
||||
|
||||
# PCALAU12I and ADDI.D have R_LARCH_RELAX. We perform relaxation.
|
||||
pcalau12i $a0, %desc_pc_hi20(d)
|
||||
.reloc .-4, R_LARCH_RELAX, 0
|
||||
addi.d $a0, $a0, %desc_pc_lo12(d)
|
||||
.reloc .-4, R_LARCH_RELAX, 0
|
||||
ld.d $ra, $a0, %desc_ld(d)
|
||||
jirl $ra, $ra, %desc_call(d)
|
||||
add.d $a4, $a0, $tp
|
||||
|
||||
.section .tbss,"awT",@nobits
|
||||
.globl a
|
||||
.zero 8
|
||||
a:
|
||||
.zero 2039 ## Place b at 0x7ff
|
||||
b:
|
||||
.zero 1
|
||||
|
||||
#--- c.s
|
||||
.section .tbss,"awT",@nobits
|
||||
.globl c, d
|
||||
c:
|
||||
.zero 2048 ## Place d at 0x1000
|
||||
d:
|
||||
.zero 4
|
||||
Loading…
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Reference in New Issue
Block a user