diff options
Diffstat (limited to 'bolt/lib/Core/Relocation.cpp')
-rw-r--r-- | bolt/lib/Core/Relocation.cpp | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/bolt/lib/Core/Relocation.cpp b/bolt/lib/Core/Relocation.cpp index c1ff2cee9cdc..25a3fc0decb4 100644 --- a/bolt/lib/Core/Relocation.cpp +++ b/bolt/lib/Core/Relocation.cpp @@ -168,16 +168,17 @@ bool skipRelocationProcessX86(uint64_t Type, uint64_t Contents) { bool skipRelocationProcessAArch64(uint64_t Type, uint64_t Contents) { auto IsMov = [](uint64_t Contents) -> bool { // The bits 28-23 are 0b100101 - if ((Contents & 0x1f800000) == 0x12800000) - return true; - return false; + return (Contents & 0x1f800000) == 0x12800000; }; auto IsB = [](uint64_t Contents) -> bool { // The bits 31-26 are 0b000101 - if ((Contents & 0xfc000000) == 0x14000000) - return true; - return false; + return (Contents & 0xfc000000) == 0x14000000; + }; + + auto IsAdr = [](uint64_t Contents) -> bool { + // The bits 31-24 are 0b0xx10000 + return (Contents & 0x9f000000) == 0x10000000; }; auto IsNop = [](uint64_t Contents) -> bool { return Contents == 0xd503201f; }; @@ -205,7 +206,7 @@ bool skipRelocationProcessAArch64(uint64_t Type, uint64_t Contents) { } } - // The ld might replace load/store instruction with jump and + // The linker might replace load/store instruction with jump and // veneer due to errata 843419 // https://documentation-service.arm.com/static/5fa29fddb209f547eebd361d // Thus load/store relocations for these instructions must be ignored @@ -223,6 +224,18 @@ bool skipRelocationProcessAArch64(uint64_t Type, uint64_t Contents) { } } + // The linker might relax ADRP+ADD or ADRP+LDR sequences to the ADR+NOP + switch (Type) { + default: + break; + case ELF::R_AARCH64_ADR_PREL_PG_HI21: + case ELF::R_AARCH64_ADD_ABS_LO12_NC: + case ELF::R_AARCH64_ADR_GOT_PAGE: + case ELF::R_AARCH64_LD64_GOT_LO12_NC: + if (IsAdr(Contents)) + return true; + } + return false; } |