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7486d92a6c
For COFF and MachO, sections semantically have relocations that apply to them. That is not the case on ELF. In relocatable objects (.o), a section with relocations in ELF has offsets to another section where the relocations should be applied. In dynamic objects and executables, relocations don't have an offset, they have a virtual address. The section sh_info may or may not point to another section, but that is not actually used for resolving the relocations. This patch exposes that in the ObjectFile API. It has the following advantages: * Most (all?) clients can handle this more efficiently. They will normally walk all relocations, so doing an effort to iterate in a particular order doesn't save time. * llvm-readobj now prints relocations in the same way the native readelf does. * probably most important, relocations that don't point to any section are now visible. This is the case of relocations in the rela.dyn section. See the updated relocation-executable.test for example. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182908 91177308-0d34-0410-b5e6-96231b3b80d8
82 lines
2.6 KiB
ArmAsm
82 lines
2.6 KiB
ArmAsm
@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \
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@ RUN: | llvm-readobj -s -sd -sr -r -t | FileCheck %s
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@ Check whether the section is switched back or not.
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@ The assembler should emit the machine code of "func2" in .text section.
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@ It is incorrect if the machine code is emitted in .ARM.exidx or .ARM.extab.
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@ Besides, there should be two entries in .ARM.exidx section.
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.syntax unified
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.text
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.globl func1
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.align 2
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.type func1,%function
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.fnstart
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func1:
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bx lr
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.fnend
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.globl func2
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.align 2
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.type func2,%function
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.fnstart
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func2:
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bx lr
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.fnend
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@-------------------------------------------------------------------------------
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@ Check the .text section. There should be two "bx lr" instructions.
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@-------------------------------------------------------------------------------
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@ CHECK: Sections [
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@ CHECK: Section {
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@ CHECK: Name: .text
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@ CHECK: SectionData (
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@ CHECK: 0000: 1EFF2FE1 1EFF2FE1 |../.../.|
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@ CHECK: )
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@ CHECK: }
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@-------------------------------------------------------------------------------
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@ Check the .ARM.exidx section.
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@ There should be two entries (two words per entry.)
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@-------------------------------------------------------------------------------
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@ CHECK: Section {
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@ CHECK: Name: .ARM.exidx
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@ CHECK: SectionData (
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@-------------------------------------------------------------------------------
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@ The first word should be the offset to .text. The second word should be
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@ 0xB0B0B080, which means compact model 0 is used (0x80) and the rest of the
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@ word is filled with FINISH opcode (0xB0).
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@-------------------------------------------------------------------------------
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@ CHECK: 0000: 00000000 B0B0B080 04000000 B0B0B080 |................|
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@ CHECK: )
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@ CHECK: }
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@ CHECK: ]
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@-------------------------------------------------------------------------------
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@ The first word of each entry should be relocated to .text section.
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@-------------------------------------------------------------------------------
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@ CHECK: Relocations [
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@ CHECK: 0x0 R_ARM_PREL31 .text 0x0
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@ CHECK: 0x0 R_ARM_NONE __aeabi_unwind_cpp_pr0 0x0
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@ CHECK: 0x8 R_ARM_PREL31 .text 0x0
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@ CHECK: ]
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@-------------------------------------------------------------------------------
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@ Check the symbols "func1" and "func2". They should belong to .text section.
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@-------------------------------------------------------------------------------
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@ CHECK: Symbols [
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@ CHECK: Symbol {
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@ CHECK: Name: func1
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@ CHECK: Section: .text (0x1)
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@ CHECK: }
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@ CHECK: Symbol {
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@ CHECK: Name: func2
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@ CHECK: Section: .text (0x1)
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@ CHECK: }
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@ CHECK: ]
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