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| author | Pat Bernardi <bernardi@adacore.com> | 2020-06-25 16:05:38 -0400 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2020-06-26 14:42:19 +0930 |
| commit | 85f7484a3a1921649029c4a4fcf3247c3f3bc13c (patch) | |
| tree | d8cec9b624c9984936c00c9f3389d0c3a757750d /gas/doc/as.texi | |
| parent | ba9b3ef5ee666467b67780e81f868c432f4fc56d (diff) | |
| download | gdb-85f7484a3a1921649029c4a4fcf3247c3f3bc13c.zip gdb-85f7484a3a1921649029c4a4fcf3247c3f3bc13c.tar.gz gdb-85f7484a3a1921649029c4a4fcf3247c3f3bc13c.tar.bz2 | |
m68k: tag floating-point ABI used
This patch adds GNU attribute support to m68k and utilises it to tag the
floating-point calling convention used (hard-float or soft-float). It enables
the linker to ensure linked objects use a consistent floating-point ABI and
allows tools like GDB to infer the ABI used from the ELF file. It is based on
similar work done for PowerPC.
bfd/
* elf32-m68k.c (m68k_elf_merge_obj_attributes): New function.
(elf32_m68k_merge_private_bfd_data): Merge GNU attributes.
binutils/
* readelf.c (display_m68k_gnu_attribute): New function.
(process_arch_specific): Call display_m68k_gnu_attribute for EM_68K.
gas/
* config/tc-m68k.c (m68k_elf_gnu_attribute): New function.
(md_pseudo_table): Handle "gnu_attribute".
* doc/as.texi: Document GNU attribute for M68K.
include/
* elf/m68k.h: Add enum for GNU object attribute with floating point
tag name and values.
ld/
* testsuite/ld-m68k/attr-gnu-4-0.s: New file.
* testsuite/ld-m68k/attr-gnu-4-1.s: Likewise.
* testsuite/ld-m68k/attr-gnu-4-2.s: Likewise.
* testsuite/ld-m68k/attr-gnu-4-00.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-01.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-02.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-10.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-11.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-12.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-20.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-21.d: Likewise.
* testsuite/ld-m68k/attr-gnu-4-22.d: Likewise.
* testsuite/ld-m68k/m68k.exp: Run the new tests.
Diffstat (limited to 'gas/doc/as.texi')
| -rw-r--r-- | gas/doc/as.texi | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/gas/doc/as.texi b/gas/doc/as.texi index f8d892e..ac4a073 100644 --- a/gas/doc/as.texi +++ b/gas/doc/as.texi @@ -7583,6 +7583,22 @@ than 1, the file can only be processed by other toolchains under some private arrangement indicated by the flag value and the vendor name. @end table +@subsection M680x0 Attributes + +@table @r +@item Tag_GNU_M68K_ABI_FP (4) +The floating-point ABI used by this object file. The value will be: + +@itemize @bullet +@item +0 for files not affected by the floating-point ABI. +@item +1 for files using double-precision hardware floating-point ABI. +@item +2 for files using the software floating-point ABI. +@end itemize +@end table + @subsection MIPS Attributes @table @r |