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[JITLink][ELF][AArch64] Implement ADR_PREL_PG_HI21, ADD_ABS_LO12_NC. 

Implements R_AARCH64_ADR_PREL_PG_HI21 and R_AARCH64_ADD_ABS_LO12_NC fixup edges
using the generic aarch64 patch edges.

Reviewed By: lhames, sgraenitz

Differential Revision: https://reviews.llvm.org/D126287
This commit is contained in:
Sunho Kim 2022-06-07 14:03:52 -07:00 committed by Lang Hames
parent 828c94c0f6
commit 25a9fb12e0
2 changed files with 80 additions and 5 deletions
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28
llvm/lib/ExecutionEngine/JITLink/ELF_aarch64.cpp
View File

@ -45,7 +45,9 @@ template <typename ELFT>
class ELFLinkGraphBuilder_aarch64 : public ELFLinkGraphBuilder<ELFT> {
private:
enum ELFAArch64RelocationKind : Edge::Kind {
ELFBranch26 = Edge::FirstRelocation,
ELFCall26 = Edge::FirstRelocation,
ELFAdrPage21,
ELFAddAbs12,
};
static Expected<ELFAArch64RelocationKind>
@ -53,7 +55,11 @@ private:
using namespace aarch64;
switch (Type) {
case ELF::R_AARCH64_CALL26:
return ELFBranch26;
return ELFCall26;
case ELF::R_AARCH64_ADR_PREL_PG_HI21:
return ELFAdrPage21;
case ELF::R_AARCH64_ADD_ABS_LO12_NC:
return ELFAddAbs12;
}
return make_error<JITLinkError>("Unsupported aarch64 relocation:" +
@ -105,10 +111,18 @@ private:
Edge::Kind Kind = Edge::Invalid;
switch (*RelocKind) {
case ELFBranch26: {
case ELFCall26: {
Kind = aarch64::Branch26;
break;
}
case ELFAdrPage21: {
Kind = aarch64::Page21;
break;
}
case ELFAddAbs12: {
Kind = aarch64::PageOffset12;
break;
}
};
Edge GE(Kind, Offset, *GraphSymbol, Addend);
@ -125,8 +139,12 @@ private:
/// Return the string name of the given ELF aarch64 edge kind.
const char *getELFAArch64RelocationKindName(Edge::Kind R) {
switch (R) {
case ELFBranch26:
return "ELFBranch26";
case ELFCall26:
return "ELFCall26";
case ELFAdrPage21:
return "ELFAdrPage21";
case ELFAddAbs12:
return "ELFAddAbs12";
default:
return getGenericEdgeKindName(static_cast<Edge::Kind>(R));
}

57
llvm/test/ExecutionEngine/JITLink/AArch64/ELF_aarch64_relocations.s Normal file
View File

@ -0,0 +1,57 @@
# RUN: rm -rf %t && mkdir -p %t
# RUN: llvm-mc -triple=aarch64-unknown-linux-gnu -relax-relocations=false -position-independent -filetype=obj -o %t/elf_reloc.o %s
# RUN: llvm-jitlink -noexec -check %s %t/elf_reloc.o
.text
.globl main
.p2align 2
.type main,@function
main:
ret
.size main, .-main
# Check R_AARCH64_CALL26 relocation of a local function call
#
# jitlink-check: decode_operand(local_func_call26, 0)[25:0] = (local_func - local_func_call26)[27:2]
.globl local_func
.p2align 2
.type local_func,@function
local_func:
ret
.size local_func, .-local_func
.globl local_func_call26
.p2align 2
local_func_call26:
bl local_func
.size local_func_call26, .-local_func_call26
# Check R_AARCH64_ADR_PREL_PG_HI21 / R_AARCH64_ADD_ABS_LO12_NC relocation of a local symbol
#
# For the ADR_PREL_PG_HI21/ADRP instruction we have the 21-bit delta to the 4k page
# containing the global.
#
# jitlink-check: decode_operand(test_adr_prel, 1) = (named_data - test_adr_prel)[32:12]
# jitlink-check: decode_operand(test_add_abs_lo12, 2) = (named_data + 0)[11:0]
.globl test_adr_prel
.p2align 2
test_adr_prel:
adrp x0, named_data
.size test_adr_prel, .-test_adr_prel
.globl test_add_abs_lo12
.p2align 2
test_add_abs_lo12:
add x0, x0, :lo12:named_data
.size test_add_abs_lo12, .-test_add_abs_lo12
.globl named_data
.p2align 4
.type named_data,@object
named_data:
.quad 0x2222222222222222
.quad 0x3333333333333333
.size named_data, .-named_data