libgcc/

        * config.host (powerpc-ibm-aix*): Add crtdbase.o to extra_parts.
        * config/rs6000/crtdbase.S: New file.
        * config/rs6000/t-aix-cxa: Build crtdbase.o.

gcc/
        * defaults.h (EH_FRAME_SECTION_NAME): Depend on
        EH_FRAME_THROUGH_COLLECT2.
        * dwarf2asm.c (dw2_asm_output_encoded_addr_rtx): Add case for
        DW_EH_PE_datarel.
        * dwarf2out.c (switch_to_eh_frame_section): Use a read-only section
        even if EH_FRAME_SECTION_NAME is undefined.  Restrict special
        collect2 labels to EH_FRAME_THROUGH_COLLECT2.
        * except.c (switch_to_exception_section): Use a read-only section
        even if EH_FRAME_SECTION_NAME is undefined.
        * system.h (EH_FRAME_IN_DATA_SECTION): Poison.
        * collect2.c (write_c_file_stat): Provide dbase on AIX.
        (scan_prog_file): Don't export __dso_handle nor
        __gcc_unwind_dbase.
        * config/rs6000/aix.h (ASM_PREFERRED_EH_DATA_FORMAT): Define.
        (EH_TABLES_CAN_BE_READ_ONLY): Define.
        (ASM_OUTPUT_DWARF_PCREL): Define.
        (ASM_OUTPUT_DWARF_DATAREL): Define.
        (EH_FRAME_THROUGH_COLLECT2): Define.
        (EH_FRAME_IN_DATA_SECTION): Delete.
        * config/rs6000/rs6000.c (rs6000_aix_asm_output_dwarf_pcrel): New.
        (rs6000_aix_asm_output_dwarf_datarel): New.
        (rs6000_xcoff_asm_init_sections): Don't set exception_section.
        * config/spu/spu-elf.h (EH_FRAME_IN_DATA_SECTION): Delete.
        (EH_FRAME_THROUGH_COLLECT2): Define.
        * config/i386/i386-interix.h (EH_FRAME_IN_DATA_SECTION): Delete.
        (EH_FRAME_THROUGH_COLLECT2): Define.
        (EH_TABLES_CAN_BE_READ_ONLY): Define.
        * doc/tm.texi.in (EH_FRAME_IN_DATA_SECTION): Delete.
        (EH_FRAME_THROUGH_COLLECT2): New.
        (ASM_OUTPUT_DWARF_DATAREL): New.
        * doc/tm.texi: Regenerate.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@227906 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 13 insertions, 7 deletions

diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index 8fe193c4f25..92835c19c1e 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -6477,14 +6477,15 @@ You should define this symbol if your target supports DWARF 2 frame
 unwind information and the default definition does not work.
 @end defmac
 
-@defmac EH_FRAME_IN_DATA_SECTION
-If defined, DWARF 2 frame unwind information will be placed in the
-data section even though the target supports named sections.  This
-might be necessary, for instance, if the system linker does garbage
-collection and sections cannot be marked as not to be collected.
+@defmac EH_FRAME_THROUGH_COLLECT2
+If defined, DWARF 2 frame unwind information will identified by
+specially named labels.  The collect2 process will locate these
+labels and generate code to register the frames.
 
-Do not define this macro unless @code{TARGET_ASM_NAMED_SECTION} is
-also defined.
+This might be necessary, for instance, if the system linker will not
+place the eh_frames in-between the sentinals from @file{crtstuff.c},
+or if the system linker does garbage collection and sections cannot
+be marked as not to be collected.
 @end defmac
 
 @defmac EH_TABLES_CAN_BE_READ_ONLY
@@ -7033,6 +7034,11 @@ A C statement to issue assembly directives that create a self-relative
 reference to the given @var{label}, using an integer of the given @var{size}.
 @end defmac
 
+@defmac ASM_OUTPUT_DWARF_DATAREL (@var{stream}, @var{size}, @var{label})
+A C statement to issue assembly directives that create a reference to the
+given @var{label} relative to the dbase, using an integer of the given @var{size}.
+@end defmac
+
 @defmac ASM_OUTPUT_DWARF_TABLE_REF (@var{label})
 A C statement to issue assembly directives that create a reference to
 the DWARF table identifier @var{label} from the current section.  This