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llvm-mirror/test/MC/RISCV/fde-reloc.s

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[RISCV][NFC] Add tests that capture current encodings for DWARF EH Items which are known to be wrong/different vs GCC are marked as TODO and will be address in follow-up patches. llvm-svn: 366326
2019-07-17 15:48:49 +02:00
# RUN: llvm-mc -filetype=obj -triple riscv32 -mattr=+relax < %s \
RISCV: adjust handling of relocation emission for RISCV This re-architects the RISCV relocation handling to bring the implementation closer in line with the implementation in binutils. We would previously aggressively resolve the relocation. With this restructuring, we always will emit a paired relocation for any symbolic difference of the type of S±T[±C] where S and T are labels and C is a constant. GAS has a special target hook controlled by `RELOC_EXPANSION_POSSIBLE` which indicates that a fixup may be expanded into multiple relocations. This is used by the RISCV backend to always emit a paired relocation - either ADD[WIDTH] + SUB[WIDTH] for text relocations or SET[WIDTH] + SUB[WIDTH] for a debug info relocation. Irrespective of whether linker relaxation support is enabled, symbolic difference is always emitted as a paired relocation. This change also sinks the target specific behaviour down into the target specific area rather than exposing it to the shared relocation handling. In the process, we also sink the "special" handling for debug information down into the RISCV target. Although this improves the path for the other targets, this is not necessarily entirely ideal either. The changes in the debug info emission could be done through another type of hook as this functionality would be required by any other target which wishes to do linker relaxation. However, as there are no other targets in LLVM which currently do this, this is a reasonable thing to do until such time as the code needs to be shared. Improve the handling of the relocation (and add a reduced test case from the Linux kernel) to ensure that we handle complex expressions for symbolic difference. This ensures that we correct relocate symbols with the adddends normalized and associated with the addition portion of the paired relocation. This change also addresses some review comments from Alex Bradbury about the relocations meant for use in the DWARF CFA being named incorrectly (using ADD6 instead of SET6) in the original change which introduced the relocation type. This resolves the issues with the symbolic difference emission sufficiently to enable building the Linux kernel with clang+IAS+lld (without linker relaxation). Resolves PR50153, PR50156! Fixes: ClangBuiltLinux/linux#1023, ClangBuiltLinux/linux#1143 Reviewed By: nickdesaulniers, maskray Differential Revision: https://reviews.llvm.org/D103539
2021-05-26 17:41:11 +02:00
# RUN: | llvm-readobj -r - | FileCheck %s
[RISCV][NFC] Add tests that capture current encodings for DWARF EH Items which are known to be wrong/different vs GCC are marked as TODO and will be address in follow-up patches. llvm-svn: 366326
2019-07-17 15:48:49 +02:00
# RUN: llvm-mc -filetype=obj -triple riscv32 -mattr=-relax < %s \
RISCV: adjust handling of relocation emission for RISCV This re-architects the RISCV relocation handling to bring the implementation closer in line with the implementation in binutils. We would previously aggressively resolve the relocation. With this restructuring, we always will emit a paired relocation for any symbolic difference of the type of S±T[±C] where S and T are labels and C is a constant. GAS has a special target hook controlled by `RELOC_EXPANSION_POSSIBLE` which indicates that a fixup may be expanded into multiple relocations. This is used by the RISCV backend to always emit a paired relocation - either ADD[WIDTH] + SUB[WIDTH] for text relocations or SET[WIDTH] + SUB[WIDTH] for a debug info relocation. Irrespective of whether linker relaxation support is enabled, symbolic difference is always emitted as a paired relocation. This change also sinks the target specific behaviour down into the target specific area rather than exposing it to the shared relocation handling. In the process, we also sink the "special" handling for debug information down into the RISCV target. Although this improves the path for the other targets, this is not necessarily entirely ideal either. The changes in the debug info emission could be done through another type of hook as this functionality would be required by any other target which wishes to do linker relaxation. However, as there are no other targets in LLVM which currently do this, this is a reasonable thing to do until such time as the code needs to be shared. Improve the handling of the relocation (and add a reduced test case from the Linux kernel) to ensure that we handle complex expressions for symbolic difference. This ensures that we correct relocate symbols with the adddends normalized and associated with the addition portion of the paired relocation. This change also addresses some review comments from Alex Bradbury about the relocations meant for use in the DWARF CFA being named incorrectly (using ADD6 instead of SET6) in the original change which introduced the relocation type. This resolves the issues with the symbolic difference emission sufficiently to enable building the Linux kernel with clang+IAS+lld (without linker relaxation). Resolves PR50153, PR50156! Fixes: ClangBuiltLinux/linux#1023, ClangBuiltLinux/linux#1143 Reviewed By: nickdesaulniers, maskray Differential Revision: https://reviews.llvm.org/D103539
2021-05-26 17:41:11 +02:00
# RUN: | llvm-readobj -r - | FileCheck %s
# Ensure that the eh_frame records the symbolic difference with the paired
# relocations always.
[RISCV][NFC] Add tests that capture current encodings for DWARF EH Items which are known to be wrong/different vs GCC are marked as TODO and will be address in follow-up patches. llvm-svn: 366326
2019-07-17 15:48:49 +02:00
func:
.cfi_startproc
ret
.cfi_endproc
RISCV: adjust handling of relocation emission for RISCV This re-architects the RISCV relocation handling to bring the implementation closer in line with the implementation in binutils. We would previously aggressively resolve the relocation. With this restructuring, we always will emit a paired relocation for any symbolic difference of the type of S±T[±C] where S and T are labels and C is a constant. GAS has a special target hook controlled by `RELOC_EXPANSION_POSSIBLE` which indicates that a fixup may be expanded into multiple relocations. This is used by the RISCV backend to always emit a paired relocation - either ADD[WIDTH] + SUB[WIDTH] for text relocations or SET[WIDTH] + SUB[WIDTH] for a debug info relocation. Irrespective of whether linker relaxation support is enabled, symbolic difference is always emitted as a paired relocation. This change also sinks the target specific behaviour down into the target specific area rather than exposing it to the shared relocation handling. In the process, we also sink the "special" handling for debug information down into the RISCV target. Although this improves the path for the other targets, this is not necessarily entirely ideal either. The changes in the debug info emission could be done through another type of hook as this functionality would be required by any other target which wishes to do linker relaxation. However, as there are no other targets in LLVM which currently do this, this is a reasonable thing to do until such time as the code needs to be shared. Improve the handling of the relocation (and add a reduced test case from the Linux kernel) to ensure that we handle complex expressions for symbolic difference. This ensures that we correct relocate symbols with the adddends normalized and associated with the addition portion of the paired relocation. This change also addresses some review comments from Alex Bradbury about the relocations meant for use in the DWARF CFA being named incorrectly (using ADD6 instead of SET6) in the original change which introduced the relocation type. This resolves the issues with the symbolic difference emission sufficiently to enable building the Linux kernel with clang+IAS+lld (without linker relaxation). Resolves PR50153, PR50156! Fixes: ClangBuiltLinux/linux#1023, ClangBuiltLinux/linux#1143 Reviewed By: nickdesaulniers, maskray Differential Revision: https://reviews.llvm.org/D103539
2021-05-26 17:41:11 +02:00
# CHECK: Section (4) .rela.eh_frame {
# CHECK-NEXT: 0x1C R_RISCV_32_PCREL - 0x0
# CHECK-NEXT: 0x20 R_RISCV_ADD32 - 0x0
# CHECK-NEXT: 0x20 R_RISCV_SUB32 - 0x0
# CHECK-NEXT: }
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