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gas: Fix checking for backwards .org with negative offset 

This patch fixes internal errors in (at least) arm and aarch64 GAS
when assembling code that attempts a negative .org.  The bug appears
to be a regression introduced in binutils-2.29 by commit 9875b36538.

	* write.c (relax_segment): Fix handling of negative offset when
	relaxing an rs_org frag.
	* testsuite/gas/aarch64/org-neg.d: New test.
	* testsuite/gas/aarch64/org-neg.l: Error output for test.
	* testsuite/gas/aarch64/org-neg.s: Input for test.
	* testsuite/gas/arm/org-neg.d: New test.
	* testsuite/gas/arm/org-neg.l: Error output for test.
	* testsuite/gas/arm/org-neg.s: Input for test.
This commit is contained in:
Alex Coplan 2020-05-29 16:04:50 +01:00 committed by Alan Modra
parent 2fdb65f247
commit c39c821c1d
8 changed files with 27 additions and 2 deletions
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11
gas/ChangeLog
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@ -1,3 +1,14 @@
2020-06-01 Alex Coplan <alex.coplan@arm.com>
* write.c (relax_segment): Fix handling of negative offset when
relaxing an rs_org frag.
* testsuite/gas/aarch64/org-neg.d: New test.
* testsuite/gas/aarch64/org-neg.l: Error output for test.
* testsuite/gas/aarch64/org-neg.s: Input for test.
* testsuite/gas/arm/org-neg.d: New test.
* testsuite/gas/arm/org-neg.l: Error output for test.
* testsuite/gas/arm/org-neg.s: Input for test.
2020-05-28 Stephen Casner <casner@acm.org>
Fix unexpected failures in gas testsuite for pdp11-aout target.

3
gas/testsuite/gas/aarch64/org-neg.d Normal file
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@ -0,0 +1,3 @@
#name: negative org should not cause internal error
#source: org-neg.s
#error_output: org-neg.l

2
gas/testsuite/gas/aarch64/org-neg.l Normal file
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@ -0,0 +1,2 @@
[^:]*: Assembler messages:
.*: Error: attempt to move .org backwards

2
gas/testsuite/gas/aarch64/org-neg.s Normal file
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@ -0,0 +1,2 @@
.=-1
ret

3
gas/testsuite/gas/arm/org-neg.d Normal file
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@ -0,0 +1,3 @@
#name: negative org should not cause internal error
#source: org-neg.s
#error_output: org-neg.l

2
gas/testsuite/gas/arm/org-neg.l Normal file
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@ -0,0 +1,2 @@
[^:]*: Assembler messages:
.*: Error: attempt to move .org backwards

2
gas/testsuite/gas/arm/org-neg.s Normal file
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@ -0,0 +1,2 @@
.=-1
nop

4
gas/write.c
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@ -2940,7 +2940,7 @@ relax_segment (struct frag *segment_frag_root, segT segment, int pass)
case rs_org:
{
addressT target = offset;
offsetT target = offset;
addressT after;
if (symbolP)
@ -2960,7 +2960,7 @@ relax_segment (struct frag *segment_frag_root, segT segment, int pass)
/* Growth may be negative, but variable part of frag
cannot have fewer than 0 chars. That is, we can't
.org backwards. */
if (address + fragP->fr_fix > target)
if ((offsetT) (address + fragP->fr_fix) > target)
{
growth = 0;