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gas: enable PC-relative diff relocations on sparc64

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gas/
	* config/tc-sparc.c (tc_gen_reloc): Convert BFD_RELOC_8/16/32/64
	into the corresponding BFD_RELOC_8/16/32/64_PCREL relocation
	when requested.
	* config/tc-sparc.h (DIFF_EXPR_OK): Define to enable PC-relative
	diff relocations.
	(TC_FORCE_RELOCATION_SUB_LOCAL): Define to ensure only supported
	relocations are made PC-relative.
	(CFI_DIFF_EXPR_OK): Define to 0 to force BFD_RELOC_32_PCREL to
	be used directly, since otherwise BFD_RELOC_SPARC_UA32 will be
	used for .eh_frame which cannot in general be converted to a
	BFD_RELOC_32_PCREL due to alignment requirements.
This commit is contained in:
James Clarke
2017-08-23 05:46:45 -07:00
committed by Jose E. Marchesi
parent b80c727008
commit f6a36b0c9e
3 changed files with 56 additions and 1 deletions
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14
gas/ChangeLog
View File

@ -1,3 +1,17 @@
2017-08-23 James Clarke <jrtc27@jrtc27.com>
* config/tc-sparc.c (tc_gen_reloc): Convert BFD_RELOC_8/16/32/64
into the corresponding BFD_RELOC_8/16/32/64_PCREL relocation
when requested.
* config/tc-sparc.h (DIFF_EXPR_OK): Define to enable PC-relative
diff relocations.
(TC_FORCE_RELOCATION_SUB_LOCAL): Define to ensure only supported
relocations are made PC-relative.
(CFI_DIFF_EXPR_OK): Define to 0 to force BFD_RELOC_32_PCREL to
be used directly, since otherwise BFD_RELOC_SPARC_UA32 will be
used for .eh_frame which cannot in general be converted to a
BFD_RELOC_32_PCREL due to alignment requirements.
2017-08-22 Alan Modra <amodra@gmail.com>
* testsuite/gas/ppc/lsp-checks.d: Assemble with -a32.

26
gas/config/tc-sparc.c
View File

@ -3946,8 +3946,33 @@ tc_gen_reloc (asection *section, fixS *fixp)
switch (fixp->fx_r_type)
{
case BFD_RELOC_8:
case BFD_RELOC_16:
case BFD_RELOC_32:
case BFD_RELOC_64:
if (fixp->fx_pcrel)
{
switch (fixp->fx_size)
{
default:
as_bad_where (fixp->fx_file, fixp->fx_line,
_("can not do %d byte pc-relative relocation"),
fixp->fx_size);
code = fixp->fx_r_type;
fixp->fx_pcrel = 0;
break;
case 1: code = BFD_RELOC_8_PCREL; break;
case 2: code = BFD_RELOC_16_PCREL; break;
case 4: code = BFD_RELOC_32_PCREL; break;
#ifdef BFD64
case 8: code = BFD_RELOC_64_PCREL; break;
#endif
}
if (fixp->fx_pcrel)
fixp->fx_addnumber = fixp->fx_offset;
break;
}
/* Fall through. */
case BFD_RELOC_HI22:
case BFD_RELOC_LO10:
case BFD_RELOC_32_PCREL_S2:
@ -3960,7 +3985,6 @@ tc_gen_reloc (asection *section, fixS *fixp)
case BFD_RELOC_SPARC_WDISP16:
case BFD_RELOC_SPARC_WDISP19:
case BFD_RELOC_SPARC_WDISP22:
case BFD_RELOC_64:
case BFD_RELOC_SPARC_5:
case BFD_RELOC_SPARC_6:
case BFD_RELOC_SPARC_7:

17
gas/config/tc-sparc.h
View File

@ -77,6 +77,8 @@ extern void sparc_handle_align (struct frag *);
#define MAX_MEM_FOR_RS_ALIGN_CODE (3 + 4 + 4)
#define DIFF_EXPR_OK /* foo-. gets turned into PC relative relocs */
/* I know that "call 0" fails in sparc-coff if this doesn't return 1. I
don't know about other relocation types, or other formats, yet. */
#ifdef OBJ_COFF
@ -128,6 +130,15 @@ extern void sparc_handle_align (struct frag *);
/* Finish up the entire symtab. */
#define tc_adjust_symtab() sparc_adjust_symtab ()
extern void sparc_adjust_symtab (void);
/* Don't allow the generic code to convert fixups involving the
subtraction of a label in the current section to pc-relative if we
don't have the necessary pc-relative relocation. */
#define TC_FORCE_RELOCATION_SUB_LOCAL(FIX, SEG) \
(!((FIX)->fx_r_type == BFD_RELOC_64 \
|| (FIX)->fx_r_type == BFD_RELOC_32 \
|| (FIX)->fx_r_type == BFD_RELOC_16 \
|| (FIX)->fx_r_type == BFD_RELOC_8))
#endif
#ifdef OBJ_AOUT
@ -200,4 +211,10 @@ extern int sparc_cie_data_alignment;
#define DWARF2_DEFAULT_RETURN_COLUMN 15
#define DWARF2_CIE_DATA_ALIGNMENT sparc_cie_data_alignment
/* cons_fix_new_sparc will chooose BFD_RELOC_SPARC_UA32 for the difference
expressions, but there is no corresponding PC-relative relocation; as this
is for debugging info though, alignment does not matter, so by disabling
this, BFD_RELOC_32_PCREL will be emitted directly instead. */
#define CFI_DIFF_EXPR_OK 0
/* end of tc-sparc.h */