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53f757e913
When compiling position-independent executables, we now use DW_EH_PE_pcrel | DW_EH_PE_sdata4. However, the MIPS ABI does not define a 64-bit PC-relative ELF relocation so we cannot use sdata8 for the large code model case. When using the large code model, we fall back to the previous behaviour of generating absolute relocations. With this change clang-generated .o files can be linked by LLD without having to pass -Wl,-z,notext (which creates text relocations). This is simpler than the approach used by ld.bfd, which rewrites the .eh_frame section to convert absolute relocations into relative references. I saw in D13104 that apparently ld.bfd did not accept pc-relative relocations for MIPS ouput at some point. However, I also checked that recent ld.bfd can process the clang-generated .o files so this no longer seems true. Reviewed By: atanasyan Differential Revision: https://reviews.llvm.org/D72228
52 lines
2.3 KiB
LLVM
52 lines
2.3 KiB
LLVM
; RUN: llc -mtriple mips-unknown-linux-gnu -mattr=+micromips -relocation-model=static -O3 -filetype=obj -o - %s | \
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; RUN: llvm-readelf -r | FileCheck %s --check-prefixes=CHECK-READELF,CHECK-READELF-STATIC
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; RUN: llc -mtriple mips-unknown-linux-gnu -mattr=+micromips -relocation-model=pic -O3 -filetype=obj -o - %s | \
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; RUN: llvm-readelf -r | FileCheck %s --check-prefixes=CHECK-READELF,CHECK-READELF-PIC
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; RUN: llc -mtriple mips-unknown-linux-gnu -mattr=+micromips -relocation-model=static -O3 -filetype=obj -o - %s | \
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; RUN: llvm-objdump -s -j .gcc_except_table - | FileCheck %s --check-prefix=CHECK-EXCEPT-TABLE-STATIC
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; RUN: llc -mtriple mips-unknown-linux-gnu -mattr=+micromips -relocation-model=pic -O3 -filetype=obj -o - %s | \
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; RUN: llvm-objdump -s -j .gcc_except_table - | FileCheck %s --check-prefix=CHECK-EXCEPT-TABLE-PIC
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; CHECK-READELF: .rel.eh_frame
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; CHECK-READELF: DW.ref.__gxx_personality_v0
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; CHECK-READELF-STATIC-NEXT: R_MIPS_32 00000000 .text
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; CHECK-READELF-PIC-NEXT: R_MIPS_PC32
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; CHECK-READELF-NEXT: .gcc_except_table
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; CHECK-EXCEPT-TABLE-STATIC: 0000 ff9b1501 0c011500 00150e23 01231e00 ...........#.#..
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; CHECK-EXCEPT-TABLE-STATIC: 0010 00010000 00000000
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; CHECK-EXCEPT-TABLE-PIC: 0000 ff9b1501 0c012d00 002d133f 013f2a00 ......-..-.?.?*.
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; CHECK-EXCEPT-TABLE-PIC: 0010 00010000 00000000 ........
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@_ZTIi = external constant i8*
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define dso_local i32 @main() local_unnamed_addr personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*) {
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entry:
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%exception.i = tail call i8* @__cxa_allocate_exception(i32 4) nounwind
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%0 = bitcast i8* %exception.i to i32*
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store i32 5, i32* %0, align 16
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invoke void @__cxa_throw(i8* %exception.i, i8* bitcast (i8** @_ZTIi to i8*), i8* null) noreturn
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to label %.noexc unwind label %return
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.noexc:
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unreachable
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return:
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%1 = landingpad { i8*, i32 }
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catch i8* null
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%2 = extractvalue { i8*, i32 } %1, 0
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%3 = tail call i8* @__cxa_begin_catch(i8* %2) nounwind
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tail call void @__cxa_end_catch()
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ret i32 0
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}
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declare i32 @__gxx_personality_v0(...)
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declare i8* @__cxa_begin_catch(i8*) local_unnamed_addr
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declare void @__cxa_end_catch() local_unnamed_addr
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declare i8* @__cxa_allocate_exception(i32) local_unnamed_addr
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declare void @__cxa_throw(i8*, i8*, i8*) local_unnamed_addr
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