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* [Bug tdep/30049] New: [gdb/tdep, powerpc64le] FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2
@ 2023-01-25 12:15 vries at gcc dot gnu.org
2023-01-25 12:27 ` [Bug tdep/30049] " cvs-commit at gcc dot gnu.org
2024-02-14 8:24 ` vries at gcc dot gnu.org
0 siblings, 2 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2023-01-25 12:15 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30049
Bug ID: 30049
Summary: [gdb/tdep, powerpc64le] FAIL:
gdb.base/unwind-on-each-insn.exp: bar: instruction 5:
bt 2
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: tdep
Assignee: unassigned at sourceware dot org
Reporter: vries at gcc dot gnu.org
Target Milestone: ---
[ Filing this to be able to reference it from commit message. ]
With the tentative patch for PR30021 comment 5, and an update to
gdb.base/unwind-on-each-insn.exp that adds testing of non-leaf function (that
I'm hoping to commit soon), I run into:
...
Running /home/vries/gdb/src/gdb/testsuite/gdb.base/unwind-on-each-insn.exp ...
FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2
FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: up
FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: [string equal $fid
$::main_fid]
FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 6: bt 2
FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 6: up
FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 6: [string equal $fid
$::main_fid]
...
[ Note that without the tentative patch, I see the same failures, and more. ]
First sign of trouble:
...
(gdb) bt 2^M
#0 0x0000000010000748 in bar ()^M
#1 0x0000000010000744 in bar ()^M
(More stack frames follow...)^M
(gdb) FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2
...
We're expecting bar/main, the same as we get at insn 4:
...
bt 2^M
#0 0x0000000010000744 in bar ()^M
#1 0x00000000100006c8 in main () at
/home/vries/gdb/src/gdb/testsuite/gdb.base/unwind-on-each-insn.c:25^M
(gdb)
...
Disassembly of bar:
...
000000001000071c <bar>:
1000071c: 02 10 40 3c lis r2,4098
10000720: 00 7f 42 38 addi r2,r2,32512
10000724: a6 02 08 7c mflr r0
10000728: 10 00 01 f8 std r0,16(r1)
1000072c: f8 ff e1 fb std r31,-8(r1)
10000730: c1 ff 21 f8 stdu r1,-64(r1)
10000734: 78 0b 3f 7c mr r31,r1
10000738: 20 00 7f f8 std r3,32(r31)
1000073c: 20 00 7f e8 ld r3,32(r31)
10000740: b5 ff ff 4b bl 100006f4 <foo>
10000744: 40 00 3f 38 addi r1,r31,64
10000748: 10 00 01 e8 ld r0,16(r1)
1000074c: a6 03 08 7c mtlr r0
10000750: f8 ff e1 eb ld r31,-8(r1)
10000754: 20 00 80 4e blr
...
The problem occurs when backtracing from pc == 10000748 and 1000074c, inbetween
the restore of stack pointer r1 and frame pointer r31.
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* [Bug tdep/30049] [gdb/tdep, powerpc64le] FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2
2023-01-25 12:15 [Bug tdep/30049] New: [gdb/tdep, powerpc64le] FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2 vries at gcc dot gnu.org
@ 2023-01-25 12:27 ` cvs-commit at gcc dot gnu.org
2024-02-14 8:24 ` vries at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2023-01-25 12:27 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30049
--- Comment #1 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Tom de Vries <vries@sourceware.org>:
https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=ebef88edb6474fa9568123645b6762bcd6872702
commit ebef88edb6474fa9568123645b6762bcd6872702
Author: Tom de Vries <tdevries@suse.de>
Date: Wed Jan 25 13:27:03 2023 +0100
[gdb/testsuite] Analyze non-leaf fn in gdb.base/unwind-on-each-insn.exp
In test-case gdb.base/unwind-on-each-insn.exp, we stepi through function
foo
to check various invariants at each insn, in particular hoping to excercise
insns that modify stack and frame pointers.
Function foo is a leaf function, so add a non-leaf function bar, and step
through it as well (using nexti instead of stepi).
With the updated test-case, on powerpc64le-linux, I run into PR tdep/30049:
...
FAIL: bar: instruction 5: bt 2
FAIL: bar: instruction 5: up
FAIL: bar: instruction 5: [string equal $fid $::main_fid]
FAIL: bar: instruction 6: bt 2
FAIL: bar: instruction 6: up
FAIL: bar: instruction 6: [string equal $fid $::main_fid]
...
Tested on:
- x86_64-linux (-m64 and -m32)
- s390x-linux (-m64 and -m31)
- aarch64-linux
- powerpc64le-linux
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* [Bug tdep/30049] [gdb/tdep, powerpc64le] FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2
2023-01-25 12:15 [Bug tdep/30049] New: [gdb/tdep, powerpc64le] FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2 vries at gcc dot gnu.org
2023-01-25 12:27 ` [Bug tdep/30049] " cvs-commit at gcc dot gnu.org
@ 2024-02-14 8:24 ` vries at gcc dot gnu.org
1 sibling, 0 replies; 3+ messages in thread
From: vries at gcc dot gnu.org @ 2024-02-14 8:24 UTC (permalink / raw)
To: gdb-prs
https://sourceware.org/bugzilla/show_bug.cgi?id=30049
Tom de Vries <vries at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Target Milestone|--- |15.1
Resolution|--- |FIXED
CC| |cel at linux dot ibm.com
--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
Fixed by:
...
commit e19e16103fb10ac28b15683f56c821cf1b349c1b
Author: Carl Love <cel@linux.ibm.com>
Date: Tue Jan 23 17:12:34 2024 -0500
rs6000, unwind-on-each-instruction fix.
...
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2023-01-25 12:15 [Bug tdep/30049] New: [gdb/tdep, powerpc64le] FAIL: gdb.base/unwind-on-each-insn.exp: bar: instruction 5: bt 2 vries at gcc dot gnu.org
2023-01-25 12:27 ` [Bug tdep/30049] " cvs-commit at gcc dot gnu.org
2024-02-14 8:24 ` vries at gcc dot gnu.org
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