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[BOLT][RISCV] Support the TLS global-dynamic relocation (#209995)

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This patch adds BOLT support for the RISC-V TLS global-dynamic
relocation `R_RISCV_TLS_GD_HI20`. Classifying it as both a **TLS
relocation** and a **GOT-style relocation** allows BOLT to preserve the
relocation, recover the actual GOT entry address from the linked
instructions, and symbolize the instruction pair.

The RISC-V TLS relocation test is extended to cover a global-dynamic
sequence and verify that BOLT reconstructs the `AUIPC`/`PCREL_LO12` pair
correctly.
This commit is contained in:
Thrrreeee 2026-07-22 08:25:01 +08:00 committed by GitHub
parent acb8fbe83f
commit 3f0919e8d9
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GPG key ID: B5690EEEBB952194
2 changed files with 25 additions and 1 deletions
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2
bolt/lib/Core/Relocation.cpp
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@ -571,6 +571,7 @@ static bool isGOTRISCV(uint32_t Type) {
return false;
case ELF::R_RISCV_GOT_HI20:
case ELF::R_RISCV_TLS_GOT_HI20:
case ELF::R_RISCV_TLS_GD_HI20:
return true;
}
}
@ -609,6 +610,7 @@ static bool isTLSRISCV(uint32_t Type) {
default:
return false;
case ELF::R_RISCV_TLS_GOT_HI20:
case ELF::R_RISCV_TLS_GD_HI20:
case ELF::R_RISCV_TPREL_HI20:
case ELF::R_RISCV_TPREL_ADD:
case ELF::R_RISCV_TPREL_LO12_I:

24
bolt/test/RISCV/reloc-tls.s
View file

@ -1,6 +1,6 @@
// RUN: llvm-mc -triple riscv64 -filetype obj -o %t.o %s
// RUN: ld.lld --emit-relocs -o %t %t.o
// RUN: llvm-bolt --print-cfg --print-only=tls_le,tls_ie -o %t.null %t \
// RUN: llvm-bolt --print-cfg --print-only=tls_le,tls_ie,tls_gd -o %t.null %t \
// RUN: | FileCheck %s
// CHECK-LABEL: Binary Function "tls_le{{.*}}" after building cfg {
@ -13,6 +13,11 @@
// CHECK-LABEL: .LBB01
// CHECK: auipc a0, %pcrel_hi(__BOLT_got_zero+{{[0-9]+}})
// CHECK-NEXT: ld a0, %pcrel_lo(.Ltmp0)(a0)
// CHECK-LABEL: Binary Function "tls_gd" after building cfg {
// CHECK-LABEL: .LBB02
// CHECK: auipc a0, %pcrel_hi(__BOLT_got_zero+{{[0-9]+}})
// CHECK-NEXT: addi a0, a0, %pcrel_lo(.Ltmp1)
.text
.globl tls_le, _start
.p2align 2
@ -34,6 +39,23 @@ tls_ie:
ret
.size tls_ie, .-tls_ie
.globl tls_gd
.p2align 2
tls_gd:
nop
1:
auipc a0, %tls_gd_pcrel_hi(i)
addi a0, a0, %pcrel_lo(1b)
call __tls_get_addr
ret
.size tls_gd, .-tls_gd
.globl __tls_get_addr
.p2align 2
__tls_get_addr:
ret
.size __tls_get_addr, .-__tls_get_addr
.section .tbss,"awT",@nobits
.type i,@object
.globl i