mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-05 13:29:22 +00:00
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
83 lines
3.0 KiB
ArmAsm
83 lines
3.0 KiB
ArmAsm
@ RUN: llvm-mc %s -triple=armv7-unknown-linux-gnueabi -filetype=obj -o - \
|
|
@ RUN: | llvm-readobj -s -sd -sr | FileCheck %s
|
|
|
|
@ Check the .fnstart directive and the .fnend directive.
|
|
|
|
@ The .fnstart directive and .fnend directive should create an entry in
|
|
@ exception handling table. For example, if the function is defined in .text
|
|
@ section, then there should be an entry in .ARM.exidx section.
|
|
|
|
.syntax unified
|
|
|
|
.text
|
|
.globl func1
|
|
.align 2
|
|
.type func1,%function
|
|
.fnstart
|
|
func1:
|
|
bx lr
|
|
.fnend
|
|
|
|
|
|
|
|
@-------------------------------------------------------------------------------
|
|
@ Check the .text section.
|
|
@-------------------------------------------------------------------------------
|
|
@ CHECK: Sections [
|
|
@ CHECK: Section {
|
|
|
|
@-------------------------------------------------------------------------------
|
|
@ Check the index of .text section. This will be used in .ARM.exidx.
|
|
@-------------------------------------------------------------------------------
|
|
@ CHECK: Index: 1
|
|
@ CHECK: Name: .text
|
|
@ CHECK: Type: SHT_PROGBITS (0x1)
|
|
@ CHECK: Flags [ (0x6)
|
|
@ CHECK: SHF_ALLOC (0x2)
|
|
@ CHECK: SHF_EXECINSTR (0x4)
|
|
@ CHECK: ]
|
|
@ CHECK: SectionData (
|
|
@ CHECK: 0000: 1EFF2FE1 |../.|
|
|
@ CHECK: )
|
|
@ CHECK: }
|
|
|
|
|
|
@-------------------------------------------------------------------------------
|
|
@ Check the name of the EXIDX section. For the function in the .text section,
|
|
@ this should be .ARM.exidx. It is incorrect to see .ARM.exidx.text here.
|
|
@-------------------------------------------------------------------------------
|
|
@ CHECK: Section {
|
|
@ CHECK: Name: .ARM.exidx
|
|
@ CHECK: Type: SHT_ARM_EXIDX (0x70000001)
|
|
@ CHECK: Flags [ (0x82)
|
|
@ CHECK: SHF_ALLOC (0x2)
|
|
@ CHECK: SHF_LINK_ORDER (0x80)
|
|
@ CHECK: ]
|
|
|
|
@-------------------------------------------------------------------------------
|
|
@ Check the linked section of the EXIDX section. This should be the index
|
|
@ of the .text section.
|
|
@-------------------------------------------------------------------------------
|
|
@ CHECK: Link: 1
|
|
|
|
@-------------------------------------------------------------------------------
|
|
@ The first word should be the offset to .text. The second word should be
|
|
@ 0xB0B0B080, which means compact model 0 is used (0x80) and the rest of the
|
|
@ word is filled with FINISH opcode (0xB0).
|
|
@-------------------------------------------------------------------------------
|
|
@ CHECK: SectionData (
|
|
@ CHECK: 0000: 00000000 B0B0B080 |........|
|
|
@ CHECK: )
|
|
@ CHECK: }
|
|
@ CHECK: ]
|
|
|
|
@-------------------------------------------------------------------------------
|
|
@ The first word should be relocated to the code address in .text section.
|
|
@ Besides, since this function is using compact model 0, thus we have to
|
|
@ add an relocation to __aeabi_unwind_cpp_pr0.
|
|
@-------------------------------------------------------------------------------
|
|
@ CHECK: Relocations [
|
|
@ CHECK: 0x0 R_ARM_PREL31 .text 0x0
|
|
@ CHECK: 0x0 R_ARM_NONE __aeabi_unwind_cpp_pr0 0x0
|
|
@ CHECK: ]
|