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[Bug tdep/12352] New: Displaced stepping doesn't work for str pc,[Rd, #imm]
- From: "qiyao at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>
- To: gdb-prs at sourceware dot org
- Date: Tue, 28 Dec 2010 06:42:02 +0000
- Subject: [Bug tdep/12352] New: Displaced stepping doesn't work for str pc,[Rd, #imm]
- Auto-submitted: auto-generated
http://sourceware.org/bugzilla/show_bug.cgi?id=12352
Summary: Displaced stepping doesn't work for str pc, [Rd, #imm]
Product: gdb
Version: HEAD
Status: NEW
Severity: normal
Priority: P2
Component: tdep
AssignedTo: unassigned@sourceware.org
ReportedBy: qiyao@gcc.gnu.org
Created attachment 5171
--> http://sourceware.org/bugzilla/attachment.cgi?id=5171
test case
Steps to reproduce:
$ gcc -march=armv7-a -marm asm1.S -g -o asm.exe
$ ./gdb ~/asm.exe
(gdb) b test_str_pc
Breakpoint 1 at 0x837c: file asm1.S, line 10.
(gdb) run
Starting program: /home/yao/asm.exe
Breakpoint 1, main () at asm1.S:10
10 str pc, [sp, #0]
(gdb) set displaced-stepping on
(gdb) set debug displaced 1
(gdb) c
Continuing.
displaced: stepping process 18618 now
displaced: saved 0x8304: 5d f8 04 1b 6a 46 4d f8 04 2d 4d f8 04 0d df f8 14 c0
4d f8 04 cd 04 48 04 4b ff f7 e2 ef ff f7
displaced: stepping insn e58df000 at 0000837c
displaced: copying str insn e58df000
displaced: read r0 value 00000001
displaced: read r2 value bebe5d2c
displaced: read r4 value 00000000
displaced: read pc value 00008384
displaced: read r13 value bebe5bd4
displaced: writing r0 value 00008384
displaced: writing r2 value bebe5bd4
displaced: writing insn e58ff014 at 00008304
displaced: writing insn e59f4010 at 00008308
displaced: writing insn e044400f at 0000830c
displaced: writing insn e2844008 at 00008310
displaced: writing insn e0800004 at 00008314
displaced: writing insn e5820000 at 00008318
displaced: copy 0x837c->0x8304: displaced: displaced pc to 0x8304
displaced: run 0x8304: 14 f0 8f e5
displaced: restored 0x8304
Program received signal SIGILL, Illegal instruction.
main () at asm1.S:10
10 str pc, [sp, #0]
------------------------------------------
Run the same case on the other ARM board, SIGSEGV is got.
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