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xtensa: fix XTENSA_NDIFF handling for PR ld/25861

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Fields marked with XTENSA_NDIFF relocations are not negated, they only
have sign bits removed. Don't negate their values when relaxation is
performed. Don't add sign bits when the value is zero. Report overflow
when the result has negative sign but all significant bits are zero.

2020-04-29  Max Filippov  <jcmvbkbc@gmail.com>
bfd/
	* elf32-xtensa.c (relax_section): Don't negate diff_value for
	XTENSA_NDIFF relocations. Don't add sign bits whe diff_value
	equals 0. Report overflow when the result has negative sign but
	all significant bits are zero.

ld/
	* testsuite/ld-xtensa/relax-diff1.d: New test definition.
	* testsuite/ld-xtensa/relax-diff1.s: New test source.
	* testsuite/ld-xtensa/relax-ndiff.d: New test definition.
	* testsuite/ld-xtensa/relax-ndiff.s: New test source.
	* testsuite/ld-xtensa/xtensa.exp: (relax-diff1)
	(relax-ndiff): New tests.
This commit is contained in:
Max Filippov 2020-04-25 00:40:25 -07:00
parent 935f1f4ba3
commit d548f47df4
8 changed files with 83 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
bfd/ChangeLog
View File

@ -1,3 +1,10 @@
2020-04-29 Max Filippov <jcmvbkbc@gmail.com>
* elf32-xtensa.c (relax_section): Don't negate diff_value for
XTENSA_NDIFF relocations. Don't add sign bits whe diff_value
equals 0. Report overflow when the result has negative sign but
all significant bits are zero.
2020-04-29 Gunther Nikl <gnikl@justmail.de>
* aoutx.h (swap_std_reloc_out): Special case 64 bit relocations.

26
bfd/elf32-xtensa.c
View File

@ -9670,37 +9670,44 @@ relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
switch (r_type)
{
case R_XTENSA_DIFF8:
diff_mask = 0x7f;
diff_value =
bfd_get_signed_8 (abfd, &contents[old_source_offset]);
break;
case R_XTENSA_DIFF16:
diff_mask = 0x7fff;
diff_value =
bfd_get_signed_16 (abfd, &contents[old_source_offset]);
break;
case R_XTENSA_DIFF32:
diff_mask = 0x7fffffff;
diff_value =
bfd_get_signed_32 (abfd, &contents[old_source_offset]);
break;
case R_XTENSA_PDIFF8:
case R_XTENSA_NDIFF8:
diff_mask = 0xff;
diff_value =
bfd_get_8 (abfd, &contents[old_source_offset]);
break;
case R_XTENSA_PDIFF16:
case R_XTENSA_NDIFF16:
diff_mask = 0xffff;
diff_value =
bfd_get_16 (abfd, &contents[old_source_offset]);
break;
case R_XTENSA_PDIFF32:
case R_XTENSA_NDIFF32:
diff_mask = 0xffffffff;
diff_value =
bfd_get_32 (abfd, &contents[old_source_offset]);
break;
}
if (r_type >= R_XTENSA_NDIFF8
&& r_type <= R_XTENSA_NDIFF32)
diff_value = -diff_value;
&& r_type <= R_XTENSA_NDIFF32
&& diff_value)
diff_value |= ~diff_mask;
new_end_offset = offset_with_removed_text_map
(&target_relax_info->action_list,
@ -9710,43 +9717,40 @@ relax_section (bfd *abfd, asection *sec, struct bfd_link_info *link_info)
switch (r_type)
{
case R_XTENSA_DIFF8:
diff_mask = 0x7f;
bfd_put_signed_8 (abfd, diff_value,
&contents[old_source_offset]);
break;
case R_XTENSA_DIFF16:
diff_mask = 0x7fff;
bfd_put_signed_16 (abfd, diff_value,
&contents[old_source_offset]);
break;
case R_XTENSA_DIFF32:
diff_mask = 0x7fffffff;
bfd_put_signed_32 (abfd, diff_value,
&contents[old_source_offset]);
break;
case R_XTENSA_PDIFF8:
case R_XTENSA_NDIFF8:
diff_mask = 0xff;
bfd_put_8 (abfd, diff_value,
&contents[old_source_offset]);
break;
case R_XTENSA_PDIFF16:
case R_XTENSA_NDIFF16:
diff_mask = 0xffff;
bfd_put_16 (abfd, diff_value,
&contents[old_source_offset]);
break;
case R_XTENSA_PDIFF32:
case R_XTENSA_NDIFF32:
diff_mask = 0xffffffff;
bfd_put_32 (abfd, diff_value,
&contents[old_source_offset]);
break;
}
/* Check for overflow. Sign bits must be all zeroes or all ones */
if ((diff_value & ~diff_mask) != 0 &&
(diff_value & ~diff_mask) != (-1 & ~diff_mask))
/* Check for overflow. Sign bits must be all zeroes or
all ones. When sign bits are all ones diff_value
may not be zero. */
if (((diff_value & ~diff_mask) != 0
&& (diff_value & ~diff_mask) != ~diff_mask)
|| (diff_value && (bfd_vma) diff_value == ~diff_mask))
{
(*link_info->callbacks->reloc_dangerous)
(link_info, _("overflow after relaxation"),

9
ld/ChangeLog
View File

@ -1,3 +1,12 @@
2020-04-29 Max Filippov <jcmvbkbc@gmail.com>
* testsuite/ld-xtensa/relax-diff1.d: New test definition.
* testsuite/ld-xtensa/relax-diff1.s: New test source.
* testsuite/ld-xtensa/relax-ndiff.d: New test definition.
* testsuite/ld-xtensa/relax-ndiff.s: New test source.
* testsuite/ld-xtensa/xtensa.exp: (relax-diff1)
(relax-ndiff): New tests.
2020-04-29 Stephen Casner <casner@acm.org>
PR 25829

6
ld/testsuite/ld-xtensa/relax-diff1.d Normal file
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@ -0,0 +1,6 @@
#as: --text-section-literals
#ld:
#objdump: -s
#...
410154 06fa0006 fffa.*
#...

18
ld/testsuite/ld-xtensa/relax-diff1.s Normal file
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@ -0,0 +1,18 @@
.globl _start
.globl _ResetVector
.text
_ResetVector:
_start:
.literal_position
movi a2, 0x12345678
movi a2, 0x12345678
1:
.space 250
2:
.space 65530
3:
.align 4
.byte 1b - 2b
.byte 2b - 1b
.short 2b - 3b
.short 3b - 2b

6
ld/testsuite/ld-xtensa/relax-ndiff.d Normal file
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@ -0,0 +1,6 @@
#as: --text-section-literals
#ld:
#objdump: -s
#...
400074 fffffff6 0000000a fff6000a f60a.*
#...

20
ld/testsuite/ld-xtensa/relax-ndiff.s Normal file
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@ -0,0 +1,20 @@
.globl _start
.globl _ResetVector
.text
_ResetVector:
_start:
.literal_position
movi a2, 0x12345678
movi a2, 0x12345678
1:
.space 10
2:
.space 10
3:
.align 4
.word 1b - 2b
.word 3b - 2b
.short 1b - 2b
.short 3b - 2b
.byte 1b - 2b
.byte 3b - 2b

2
ld/testsuite/ld-xtensa/xtensa.exp
View File

@ -27,7 +27,9 @@ run_dump_test "call_overflow"
run_dump_test "coalesce"
run_dump_test "diff_overflow"
run_dump_test "lcall"
run_dump_test "relax-diff1"
run_dump_test "relax-loc"
run_dump_test "relax-ndiff"
run_dump_test "relax-static-pie"
run_dump_test "relax-static-local-pie"