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Fix sparc TLS call relaxation when the delay slot sets up %o0.

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bfd/

	PR binutils/13301
	* elfxx-sparc.c (sparc_elf_find_reloc_at_ofs): New function.
	(_bfd_sparc_elf_relocate_section): Always move the __tls_get_addr
	call delay slot instruction forward 4 bytes when performing
	relaxation.

gold/

	PR binutils/13301
	* sparc.cc (Target_sparc::Relocate::reloc_adjust_addr_): New
	member to track relocation locations that have moved during TLS
	reloc optimizations.
	(Target_sparc::Relocate::Relocate): Initialize to NULL.
	(Target_sparc::Relocate::relocate): Adjust view down by 4
	bytes if it matches reloc_adjust_addr_.
	(Target_sparc::Relocate::relocate_tls): Always move the
	__tls_get_addr call delay slot instruction forward 4 bytes when
	performing relaxation.

ld/testsuite/

	* ld-sparc/tlssunbin32.dd: Update for TLS call relaxation fix
	for PR 13301.
	* ld-sparc/tlssunbin64.dd: Likewise.
	* ld-sparc/tlssunpic32.dd: Likewise.
	* ld-sparc/tlssunpic64.dd: Likewise.
This commit is contained in:
David S. Miller 2011-10-19 00:32:25 +00:00
parent 01b701aae6
commit abd242a908
9 changed files with 103 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
bfd/ChangeLog
View File

@ -1,3 +1,11 @@
2011-10-18 David S. Miller <davem@davemloft.net>
PR binutils/13301
* elfxx-sparc.c (sparc_elf_find_reloc_at_ofs): New function.
(_bfd_sparc_elf_relocate_section): Always move the __tls_get_addr
call delay slot instruction forward 4 bytes when performing
relaxation.
2011-10-17 Alan Modra <amodra@gmail.com>
PR ld/12975

36
bfd/elfxx-sparc.c
View File

@ -1830,6 +1830,20 @@ _bfd_sparc_elf_gc_mark_hook (asection *sec,
return _bfd_elf_gc_mark_hook (sec, info, rel, h, sym);
}
static Elf_Internal_Rela *
sparc_elf_find_reloc_at_ofs (Elf_Internal_Rela *rel,
Elf_Internal_Rela *relend,
bfd_vma offset)
{
while (rel < relend)
{
if (rel->r_offset == offset)
return rel;
rel++;
}
return NULL;
}
/* Update the got entry reference counts for the section being removed. */
bfd_boolean
_bfd_sparc_elf_gc_sweep_hook (bfd *abfd, struct bfd_link_info *info,
@ -3676,6 +3690,7 @@ _bfd_sparc_elf_relocate_section (bfd *output_bfd,
if (! info->shared
|| (r_type == R_SPARC_TLS_GD_CALL && tls_type == GOT_TLS_IE))
{
Elf_Internal_Rela *rel2;
bfd_vma insn;
if (!info->shared && (h == NULL || h->dynindx == -1))
@ -3711,7 +3726,26 @@ _bfd_sparc_elf_relocate_section (bfd *output_bfd,
continue;
}
bfd_put_32 (output_bfd, 0x9001c008, contents + rel->r_offset);
/* We cannot just overwrite the delay slot instruction,
as it might be what puts the %o0 argument to
__tls_get_addr into place. So we have to transpose
the delay slot with the add we patch in. */
insn = bfd_get_32 (input_bfd, contents + rel->r_offset + 4);
bfd_put_32 (output_bfd, insn,
contents + rel->r_offset);
bfd_put_32 (output_bfd, 0x9001c008,
contents + rel->r_offset + 4);
rel2 = rel;
while ((rel2 = sparc_elf_find_reloc_at_ofs (rel2 + 1, relend,
rel->r_offset + 4))
!= NULL)
{
/* If the instruction we moved has a relocation attached to
it, adjust the offset so that it will apply to the correct
instruction. */
rel2->r_offset -= 4;
}
continue;
}

13
gold/ChangeLog
View File

@ -1,3 +1,16 @@
2011-10-18 David S. Miller <davem@davemloft.net>
PR binutils/13301
* sparc.cc (Target_sparc::Relocate::reloc_adjust_addr_): New
member to track relocation locations that have moved during TLS
reloc optimizations.
(Target_sparc::Relocate::Relocate): Initialize to NULL.
(Target_sparc::Relocate::relocate): Adjust view down by 4
bytes if it matches reloc_adjust_addr_.
(Target_sparc::Relocate::relocate_tls): Always move the
__tls_get_addr call delay slot instruction forward 4 bytes when
performing relaxation.
2011-10-18 Cary Coutant <ccoutant@google.com>
* output.cc (posix_fallocate): Return 0 on success, errno on failure.

17
gold/sparc.cc
View File

@ -265,7 +265,7 @@ class Target_sparc : public Sized_target<size, big_endian>
{
public:
Relocate()
: ignore_gd_add_(false)
: ignore_gd_add_(false), reloc_adjust_addr_(NULL)
{ }
~Relocate()
@ -302,6 +302,9 @@ class Target_sparc : public Sized_target<size, big_endian>
// Ignore the next relocation which should be R_SPARC_TLS_GD_ADD
bool ignore_gd_add_;
// If we hit a reloc at this view address, adjust it back by 4 bytes.
unsigned char *reloc_adjust_addr_;
};
// A class which returns the size required for a relocation type,
@ -2622,6 +2625,8 @@ Target_sparc<size, big_endian>::Relocate::relocate(
return false;
}
}
if (this->reloc_adjust_addr_ == view)
view -= 4;
typedef Sparc_relocate_functions<size, big_endian> Reloc;
@ -3101,7 +3106,15 @@ Target_sparc<size, big_endian>::Relocate::relocate_tls(
wv += 1;
this->ignore_gd_add_ = true;
}
else
{
// Even if the delay slot isn't the TLS_GD_ADD
// instruction, we still have to handle the case
// where it sets up %o0 in some other way.
elfcpp::Swap<32, true>::writeval(wv, val);
wv += 1;
this->reloc_adjust_addr_ = view + 4;
}
// call __tls_get_addr --> add %g7, %o0, %o0
elfcpp::Swap<32, true>::writeval(wv, 0x9001c008);
break;

8
ld/testsuite/ChangeLog
View File

@ -1,3 +1,11 @@
2011-10-18 David S. Miller <davem@davemloft.net>
* ld-sparc/tlssunbin32.dd: Update for TLS call relaxation fix
for PR 13301.
* ld-sparc/tlssunbin64.dd: Likewise.
* ld-sparc/tlssunpic32.dd: Likewise.
* ld-sparc/tlssunpic64.dd: Likewise.
2011-10-18 Jie Zhang <jie@codesourcery.com>
Julian Brown <julian@codesourcery.com>

8
ld/testsuite/ld-sparc/tlssunbin32.dd
View File

@ -27,8 +27,8 @@ Disassembly of section .text:
+11034: 01 00 00 00 nop *
+11038: d0 05 c0 12 ld \[ %l7 \+ %l2 \], %o0
+1103c: 01 00 00 00 nop *
+11040: 90 01 c0 08 add %g7, %o0, %o0
+11044: 01 00 00 00 nop *
+11040: 01 00 00 00 nop *
+11044: 90 01 c0 08 add %g7, %o0, %o0
+11048: 01 00 00 00 nop *
+1104c: 01 00 00 00 nop *
+11050: 01 00 00 00 nop *
@ -36,8 +36,8 @@ Disassembly of section .text:
+11058: 11 00 00 00 sethi %hi\(0\), %o0
+1105c: 92 02 20 08 add %o0, 8, %o1 ! 8 <.*>
+11060: d0 05 c0 09 ld \[ %l7 \+ %o1 \], %o0
+11064: 90 01 c0 08 add %g7, %o0, %o0
+11068: 01 00 00 00 nop *
+11064: 01 00 00 00 nop *
+11068: 90 01 c0 08 add %g7, %o0, %o0
+1106c: 01 00 00 00 nop *
+11070: 01 00 00 00 nop *
+11074: 01 00 00 00 nop *

8
ld/testsuite/ld-sparc/tlssunbin64.dd
View File

@ -27,8 +27,8 @@ Disassembly of section .text:
+101034: 01 00 00 00 nop *
+101038: d0 5d c0 12 ldx \[ %l7 \+ %l2 \], %o0
+10103c: 01 00 00 00 nop *
+101040: 90 01 c0 08 add %g7, %o0, %o0
+101044: 01 00 00 00 nop *
+101040: 01 00 00 00 nop *
+101044: 90 01 c0 08 add %g7, %o0, %o0
+101048: 01 00 00 00 nop *
+10104c: 01 00 00 00 nop *
+101050: 01 00 00 00 nop *
@ -36,8 +36,8 @@ Disassembly of section .text:
+101058: 11 00 00 00 sethi %hi\(0\), %o0
+10105c: 92 02 20 10 add %o0, 0x10, %o1 ! 10 <.*>
+101060: d0 5d c0 09 ldx \[ %l7 \+ %o1 \], %o0
+101064: 90 01 c0 08 add %g7, %o0, %o0
+101068: 01 00 00 00 nop *
+101064: 01 00 00 00 nop *
+101068: 90 01 c0 08 add %g7, %o0, %o0
+10106c: 01 00 00 00 nop *
+101070: 01 00 00 00 nop *
+101074: 01 00 00 00 nop *

16
ld/testsuite/ld-sparc/tlssunpic32.dd
View File

@ -37,8 +37,8 @@ Disassembly of section .text:
+1058: 11 00 00 00 sethi %hi\(0\), %o0
+105c: 92 02 20 3c add %o0, 0x3c, %o1 ! 3c <.*>
+1060: d0 05 c0 09 ld \[ %l7 \+ %o1 \], %o0
+1064: 90 01 c0 08 add %g7, %o0, %o0
+1068: 01 00 00 00 nop *
+1064: 01 00 00 00 nop *
+1068: 90 01 c0 08 add %g7, %o0, %o0
+106c: 01 00 00 00 nop *
+1070: 01 00 00 00 nop *
+1074: 01 00 00 00 nop *
@ -55,8 +55,8 @@ Disassembly of section .text:
+10a0: 11 00 00 00 sethi %hi\(0\), %o0
+10a4: 90 02 20 0c add %o0, 0xc, %o0 ! c <.*>
+10a8: d0 05 c0 08 ld \[ %l7 \+ %o0 \], %o0
+10ac: 90 01 c0 08 add %g7, %o0, %o0
+10b0: 01 00 00 00 nop *
+10ac: 01 00 00 00 nop *
+10b0: 90 01 c0 08 add %g7, %o0, %o0
+10b4: 01 00 00 00 nop *
+10b8: 01 00 00 00 nop *
+10bc: 01 00 00 00 nop *
@ -73,8 +73,8 @@ Disassembly of section .text:
+10e8: 11 00 00 00 sethi %hi\(0\), %o0
+10ec: 90 02 20 48 add %o0, 0x48, %o0 ! 48 <.*>
+10f0: d0 05 c0 08 ld \[ %l7 \+ %o0 \], %o0
+10f4: 90 01 c0 08 add %g7, %o0, %o0
+10f8: 01 00 00 00 nop *
+10f4: 01 00 00 00 nop *
+10f8: 90 01 c0 08 add %g7, %o0, %o0
+10fc: 01 00 00 00 nop *
+1100: 01 00 00 00 nop *
+1104: 01 00 00 00 nop *
@ -91,8 +91,8 @@ Disassembly of section .text:
+1130: 11 00 00 00 sethi %hi\(0\), %o0
+1134: 90 02 20 24 add %o0, 0x24, %o0 ! 24 <.*>
+1138: d0 05 c0 08 ld \[ %l7 \+ %o0 \], %o0
+113c: 90 01 c0 08 add %g7, %o0, %o0
+1140: 01 00 00 00 nop *
+113c: 01 00 00 00 nop *
+1140: 90 01 c0 08 add %g7, %o0, %o0
+1144: 01 00 00 00 nop *
+1148: 01 00 00 00 nop *
+114c: 01 00 00 00 nop *

16
ld/testsuite/ld-sparc/tlssunpic64.dd
View File

@ -37,8 +37,8 @@ Disassembly of section .text:
+1058: 11 00 00 00 sethi %hi\(0\), %o0
+105c: 92 02 20 78 add %o0, 0x78, %o1 ! 78 <.*>
+1060: d0 5d c0 09 ldx \[ %l7 \+ %o1 \], %o0
+1064: 90 01 c0 08 add %g7, %o0, %o0
+1068: 01 00 00 00 nop *
+1064: 01 00 00 00 nop *
+1068: 90 01 c0 08 add %g7, %o0, %o0
+106c: 01 00 00 00 nop *
+1070: 01 00 00 00 nop *
+1074: 01 00 00 00 nop *
@ -55,8 +55,8 @@ Disassembly of section .text:
+10a0: 11 00 00 00 sethi %hi\(0\), %o0
+10a4: 90 02 20 18 add %o0, 0x18, %o0 ! 18 <.*>
+10a8: d0 5d c0 08 ldx \[ %l7 \+ %o0 \], %o0
+10ac: 90 01 c0 08 add %g7, %o0, %o0
+10b0: 01 00 00 00 nop *
+10ac: 01 00 00 00 nop *
+10b0: 90 01 c0 08 add %g7, %o0, %o0
+10b4: 01 00 00 00 nop *
+10b8: 01 00 00 00 nop *
+10bc: 01 00 00 00 nop *
@ -73,8 +73,8 @@ Disassembly of section .text:
+10e8: 11 00 00 00 sethi %hi\(0\), %o0
+10ec: 90 02 20 90 add %o0, 0x90, %o0 ! 90 <.*>
+10f0: d0 5d c0 08 ldx \[ %l7 \+ %o0 \], %o0
+10f4: 90 01 c0 08 add %g7, %o0, %o0
+10f8: 01 00 00 00 nop *
+10f4: 01 00 00 00 nop *
+10f8: 90 01 c0 08 add %g7, %o0, %o0
+10fc: 01 00 00 00 nop *
+1100: 01 00 00 00 nop *
+1104: 01 00 00 00 nop *
@ -91,8 +91,8 @@ Disassembly of section .text:
+1130: 11 00 00 00 sethi %hi\(0\), %o0
+1134: 90 02 20 48 add %o0, 0x48, %o0 ! 48 <.*>
+1138: d0 5d c0 08 ldx \[ %l7 \+ %o0 \], %o0
+113c: 90 01 c0 08 add %g7, %o0, %o0
+1140: 01 00 00 00 nop *
+113c: 01 00 00 00 nop *
+1140: 90 01 c0 08 add %g7, %o0, %o0
+1144: 01 00 00 00 nop *
+1148: 01 00 00 00 nop *
+114c: 01 00 00 00 nop *