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Fix gdb.reverse/finish-reverse-bkpt.exp

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I see the following fail on aarch64-linux

 break void_func
 Breakpoint 2 at 0x4007a0: file gdb/testsuite/gdb.reverse/finish-reverse.c, line 44.
 (gdb) PASS: gdb.reverse/finish-reverse-bkpt.exp: set breakpoint on void_func
 continue
 Continuing.

 Breakpoint 2, void_func () at gdb/testsuite/gdb.reverse/finish-reverse.c:44^M
 44        void_test = 1;                /* VOID FUNC */^M
 (gdb) PASS: gdb.reverse/finish-reverse-bkpt.exp: continue to breakpoint: void_func
 break *void_func^M
 Note: breakpoint 2 also set at pc 0x4007a0.^M
 Breakpoint 3 at 0x4007a0: file gdb/testsuite/gdb.reverse/finish-reverse.c, line 44.
 (gdb) PASS: gdb.reverse/finish-reverse-bkpt.exp: set breakpoint at void_func's entry
 reverse-finish^M
 Run back to call of #0  void_func () at gdb/testsuite/gdb.reverse/finish-reverse.c:44
 main (argc=1, argv=0x7ffffffb78) at gdb/testsuite/gdb.reverse/finish-reverse.c:98
 98        void_func ();                                 /* call to void_func */^M
 (gdb) FAIL: gdb.reverse/finish-reverse-bkpt.exp: reverse-finish from void_func trips breakpoint at entry

The test assumes that brekapoints on "void_func" and "*void_func" are
set on different places because of function prologue.  However, on
aarch64-linux, there is no prologue in void_func, so two breakpoints
are set at the same place (0x4007a0).

(gdb) disassemble void_func
Dump of assembler code for function void_func:
   0x00000000004007a0 <+0>:	adrp	x0, 0x410000
   0x00000000004007a4 <+4>:	add	x0, x0, #0xc14
   0x00000000004007a8 <+8>:	mov	w1, #0x1
   0x00000000004007ac <+12>:	str	w1, [x0]
   0x00000000004007b0 <+16>:	ret

The fix to this problem is to single step forward before setting
breakpoint on *void_func.

gdb/testsuite:

2016-04-07  Yao Qi  <yao.qi@linaro.org>

	* gdb.reverse/finish-reverse-bkpt.exp: Use temporary breakpoint.
	Execute "si" command.
This commit is contained in:
Yao Qi
2016-04-07 17:06:14 +01:00
parent bde475616e
commit c8064e7e9b
2 changed files with 12 additions and 2 deletions
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5
gdb/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2016-04-07 Yao Qi <yao.qi@linaro.org>
* gdb.reverse/finish-reverse-bkpt.exp: Use temporary breakpoint.
Execute "si" command.
2016-04-07 Yao Qi <yao.qi@linaro.org> 2016-04-07 Yao Qi <yao.qi@linaro.org>
* gdb.reverse/next-reverse-bkpt-over-sr.exp: Match the breakpoint * gdb.reverse/next-reverse-bkpt-over-sr.exp: Match the breakpoint

9
gdb/testsuite/gdb.reverse/finish-reverse-bkpt.exp
View File

@ -40,11 +40,16 @@ if [supports_process_record] {
} }
set breakloc [gdb_get_line_number "VOID FUNC" "$srcfile"] set breakloc [gdb_get_line_number "VOID FUNC" "$srcfile"]
gdb_test "break void_func" \ gdb_test "tbreak void_func" \
"Breakpoint $decimal at .*$srcfile, line $breakloc\." \ "Temporary breakpoint $decimal at .*$srcfile, line $breakloc\." \
"set breakpoint on void_func" "set breakpoint on void_func"
gdb_continue_to_breakpoint "void_func" ".*$srcfile:$breakloc.*" gdb_continue_to_breakpoint "void_func" ".*$srcfile:$breakloc.*"
# We stop at the brekapoint on void_func, but breakpoint on
# *void_func will be set at the same place if function void_func doesn't
# have prologue. One step forward to avoid this.
gdb_test "si"
gdb_test "break \*void_func" \ gdb_test "break \*void_func" \
"Breakpoint $decimal at .*" \ "Breakpoint $decimal at .*" \
"set breakpoint at void_func's entry" "set breakpoint at void_func's entry"