[Bug breakpoints/17431] New: follow-exec, "always-inserted on", breakpoints inserted too soon

["palves at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=17431

            Bug ID: 17431
           Summary: follow-exec, "always-inserted on", breakpoints
                    inserted too soon
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: breakpoints
          Assignee: unassigned at sourceware dot org
          Reporter: palves at redhat dot com

Following an exec with "breakpoint always-inserted on" tries to insert
breakpoints in the image at the addresses the symbols had in the old image.

With "always-inserted off", we see:

gdb testsuite/gdb.multi/multi-arch-exec -ex "set breakpoint always-inserted
off" -ex "cd testsuite"
GNU gdb (GDB) 7.8.50.20140924-cvs
...
(gdb) b main
Breakpoint 1 at 0x400664: file gdb.multi/multi-arch-exec.c, line 24.
                ^^^^^^^^
(gdb) c
The program is not being run.
(gdb) r
Starting program: testsuite/gdb.multi/multi-arch-exec 

Breakpoint 1, main () at gdb/testsuite/gdb.multi/multi-arch-exec.c:24
24        execl (BASEDIR "/multi-arch-exec-hello",
(gdb) c
Continuing.
process 9212 is executing new program:
gdb/testsuite/gdb.multi/multi-arch-exec-hello

Breakpoint 1, main () at gdb/testsuite/gdb.multi/hello.c:40
40        bar();
(gdb) info breakpoints 
Num     Type           Disp Enb Address    What
1       breakpoint     keep y   0x080484e4 in main at
gdb/testsuite/gdb.multi/hello.c:40
                                ^^^^^^^^^^
        breakpoint already hit 2 times
(gdb)


Note how main was 0x400664 in multi-arch-exec, but is 0x080484e4 in
gdb.multi/hello.

With "always-inserted on", we get:

Breakpoint 1, main () at gdb/testsuite/gdb.multi/multi-arch-exec.c:24
24        execl (BASEDIR "/multi-arch-exec-hello",
(gdb) c
Continuing.
infrun: target_wait (-1, status) =
infrun:   9444 [process 9444],
infrun:   status->kind = execd
infrun: infwait_normal_state
infrun: TARGET_WAITKIND_EXECD
Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0x400664

(gdb)

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