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authorPat Bernardi <bernardi@adacore.com>2020-06-25 16:05:38 -0400
committerAlan Modra <amodra@gmail.com>2020-06-26 14:42:19 +0930
commit85f7484a3a1921649029c4a4fcf3247c3f3bc13c (patch)
treed8cec9b624c9984936c00c9f3389d0c3a757750d /include
parentba9b3ef5ee666467b67780e81f868c432f4fc56d (diff)
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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 'include')
-rw-r--r--include/ChangeLog5
-rw-r--r--include/elf/m68k.h14
2 files changed, 18 insertions, 1 deletions
diff --git a/include/ChangeLog b/include/ChangeLog
index 8e06abf..ab6d753 100644
--- a/include/ChangeLog
+++ b/include/ChangeLog
@@ -1,3 +1,8 @@
+2020-06-26 Pat Bernardi <bernardi@adacore.com>
+
+ * elf/m68k.h: Add enum for GNU object attribute with floating point
+ tag name and values.
+
2020-06-25 Nick Clifton <nickc@redhat.com>
* libiberty.h (bsearch_r): Remove use of the register keyword from
diff --git a/include/elf/m68k.h b/include/elf/m68k.h
index 2d3c12e..e5b0592 100644
--- a/include/elf/m68k.h
+++ b/include/elf/m68k.h
@@ -97,5 +97,17 @@ END_RELOC_NUMBERS (R_68K_max)
#define EF_M68K_CF_EMAC_B 0x30 /* EMAC_B */
#define EF_M68K_CF_FLOAT 0x40 /* Has float insns */
#define EF_M68K_CF_MASK 0xFF
-
+
+/* GNU object attribute tags. */
+enum
+{
+ /* 0-3 are generic. */
+
+ /* FP ABI, low 2 bits:
+ 1 for double precision hard-float,
+ 2 for soft-float,
+ 0 for not tagged or not using any ABIs affected by the differences. */
+ Tag_GNU_M68K_ABI_FP = 4,
+};
+
#endif