gdb/54: xbreak is broken (off by 1).
Sat May 12 00:18:00 GMT 2001

>Number:         54
>Category:       gdb
>Synopsis:       xbreak is broken (off by 1).
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat May 12 00:18:00 PDT 2001
>Originator:     Fred Reiss
>Release:        5.0rh-5 Red Hat Linux 7.1
Default Red Hat Linux 7.1 installation on a Pentium III.
xbreak sets its breakpoints one byte too high.
[wuzzy:~] 15) gcc -g hello.c
[wuzzy:~] 16) gdb a.out
GNU gdb 5.0rh-5 Red Hat Linux 7.1
Copyright 2001 Free Software Foundation, Inc.
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This GDB was configured as "i386-redhat-linux"...
(gdb) xbreak main
Breakpoint 1 at 0x804847d
(gdb) disas main
Dump of assembler code for function main:
0x8048460 <main>:       push   %ebp
0x8048461 <main+1>:     mov    %esp,%ebp
0x8048463 <main+3>:     sub    $0x8,%esp
0x8048466 <main+6>:     sub    $0xc,%esp
0x8048469 <main+9>:     push   $0x80484e8
0x804846e <main+14>:    call   0x804833c <printf>
0x8048473 <main+19>:    add    $0x10,%esp
0x8048476 <main+22>:    mov    $0x0,%eax
0x804847b <main+27>:    leave
0x804847c <main+28>:    ret
End of assembler dump.
(gdb) ru
Starting program: /home/phred/a.out
Hello, world!
Program exited normally.
You probably want to subtract DECR_PC_AFTER_BREAK from the
address at which xbreak currently sets its breakpoint.

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