353057a53c
add_fde_encoding. Remove need_relative. * elf-eh-frame.c (extra_augmentation_string_bytes) (extra_augmentation_data_bytes, size_of_output_cie_fde): New functions. (_bfd_elf_discard_section_eh_frame): Consider changing the FDE encoding in cases where the CIE has no existing 'R' augmentation. Use size_of_output_cie_fde when assigning offsets. Use the final offset as the new section size. (_bfd_elf_eh_frame_section_offset): Remove need_relative handling. Account for any extra augmentation bytes in the returned offset. (_bfd_elf_write_section_eh_frame): Rework so that the entries are moved before being modified. Pad growing entries with DW_CFA_nops. Add 'z' and 'R' augmentations as directed by add_augmentation_size and add_fde_encoding.
148 lines
3.1 KiB
ArmAsm
148 lines
3.1 KiB
ArmAsm
#----------------------------------------------------------------------------
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# Macros
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#----------------------------------------------------------------------------
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mask = (1 << alignment) - 1
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# Output VALUE as an unaligned pointer-sized quantity.
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.macro pbyte value
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.if alignment == 2
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.4byte \value
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.else
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.8byte \value
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.endif
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.endm
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# Start a new CIE, and emit everything up to the augmentation data.
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# Use LABEL to mark the start of the entry and AUG as the augmentation
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# string.
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.macro start_cie label,aug
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.section .eh_frame,"aw",@progbits
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\label:
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.word 2f-1f # Length
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1:
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.word 0 # Identifier
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.byte 1 # Version
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.string "\aug" # Augmentation
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.byte 1 # Code alignment
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.byte 4 # Data alignment
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.byte 31 # Return address column
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.endm
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# Create a dummy function of SIZE bytes in SECTION and emit the
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# first four entries of an FDE for it.
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.macro start_fde cie,section,size
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.section \section,"ax",@progbits
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3:
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.rept \size / 4
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nop
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.endr
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4:
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.section .eh_frame,"aw",@progbits
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.word 2f-1f # Length
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1:
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.word .-\cie # CIE offset
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pbyte 3b # Initial PC
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pbyte 4b-3b # Size of code
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.endm
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# Finish a CIE or FDE entry.
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.macro end_entry
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.p2align alignment,fill
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2:
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.endm
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# Start the augmentation data for a CIE that has a 'P' entry
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# followed by EXTRA bytes. AUGLEN is the length of augmentation
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# string (including zero terminator), ENCODING is the encoding to
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# use for the personality routine and VALUE is the value it
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# should have.
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.macro persaug auglen,extra,encoding,value
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.if (\encoding & 0xf0) == 0x50
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.byte (-(9 + \auglen + 3 + 2) & mask) + 2 + mask + \extra
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.byte \encoding
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.fill -(9 + \auglen + 3 + 2) & mask,1,0
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.else
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.byte 2 + mask + \extra
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.byte \encoding
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.endif
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pbyte \value
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.endm
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.macro cie_basic label
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start_cie \label,""
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end_entry
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.endm
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.macro fde_basic cie,section,size
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start_fde \cie,\section,\size
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end_entry
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.endm
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.macro cie_zP label,encoding,value
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start_cie \label,"zP"
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persaug 3,0,\encoding,\value
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end_entry
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.endm
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.macro fde_zP cie,section,size
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start_fde \cie,\section,\size
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.byte 0 # Augmentation length
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end_entry
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.endm
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.macro cie_zPR label,encoding,value
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start_cie \label,"zPR"
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persaug 4,1,\encoding,\value
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.byte 0 # FDE enconding
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end_entry
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.endm
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.macro fde_zPR cie,section,size
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start_fde \cie,\section,\size
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.byte 0 # Augmentation length
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end_entry
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.endm
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#----------------------------------------------------------------------------
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# Test code
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#----------------------------------------------------------------------------
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cie_basic basic1
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fde_basic basic1,.text,0x10
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fde_basic basic1,.text,0x20
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cie_basic basic2
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fde_basic basic2,.text,0x30
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cie_basic basic3
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fde_basic basic3,.text,0x40
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cie_basic basic4
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fde_basic basic4,.text,0x50
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cie_zP zP_unalign1,0x00,foo
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fde_zP zP_unalign1,.text,0x10
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fde_zP zP_unalign1,.text,0x20
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cie_zP zP_align1,0x50,foo
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fde_zP zP_align1,.text,0x10
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fde_zP zP_align1,.text,0x20
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cie_zPR zPR1,0x00,foo
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fde_zPR zPR1,.text,0x10
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fde_zPR zPR1,.discard,0x20
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cie_zPR zPR2,0x00,foo
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fde_zPR zPR2,.text,0x30
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fde_zPR zPR2,.text,0x40
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cie_basic basic5
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fde_basic basic5,.text,0x10
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