diff options
| author | John Baldwin <jhb@FreeBSD.org> | 2016-06-12 21:24:42 -0700 |
|---|---|---|
| committer | John Baldwin <jhb@FreeBSD.org> | 2016-06-24 10:46:03 -0700 |
| commit | e6cdd38e8f0fead14cd3c528e9a4b666e1871752 (patch) | |
| tree | 357ce93c54e5400c660476da9aac57d511aca674 /gdb/configure | |
| parent | 82372b2f2747d347e24bb10ddc7bc7e828222a42 (diff) | |
Add support for catching system calls to native FreeBSD targets.
All platforms on FreeBSD use a shared system call table, so use a
single XML file to describe the system calls available on each FreeBSD
platform.
Recent versions of FreeBSD include the identifier of the current
system call when reporting a system call entry or exit event in the
ptrace_lwpinfo structure obtained via PT_LWPINFO in fbsd_wait. As
such, FreeBSD native targets do not use the gdbarch method to fetch
the system call code. In addition, FreeBSD register sets fetched via
ptrace do not include an equivalent of 'orig_rax' (on amd64 for
example), so the system call code cannot be extracted from the
available registers during a system call exit. However, GDB assumes
that system call catch points are not supported if the gdbarch method
is not present. As a workaround, FreeBSD ABIs install a dummy gdbarch
method that throws an internal_error if it is ever invoked.
gdb/ChangeLog:
* configure.ac: Check for support for system call LWP fields on
FreeBSD.
* config.in, configure: Rebuild.
* data-directory/Makefile.in (SYSCALLS_FILES): Add freebsd.xml.
* fbsd-nat.c (fbsd_wait) [HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE]:
Report system call events.
[HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE]
(fbsd_set_syscall_catchpoint): New function.
(fbsd_nat_add_target) [HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE]:
Set "to_set_syscall_catchpoint" to "fbsd_set_syscall_catchpoint".
* fbsd-tdep.c: Include xml-syscall.h
(fbsd_get_syscall_number): New function.
(fbsd_init_abi): Set XML system call file name.
Add "get_syscall_number" gdbarch method.
* syscalls/freebsd.xml: New file.
Diffstat (limited to 'gdb/configure')
| -rwxr-xr-x | gdb/configure | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/gdb/configure b/gdb/configure index 60ea8847f0..ea11b50144 100755 --- a/gdb/configure +++ b/gdb/configure @@ -12927,6 +12927,20 @@ _ACEOF fi +# See if <sys/ptrace.h> supports syscall fields on FreeBSD. The +# pl_syscall_code member of `struct ptrace_lwpinfo' was added in +# FreeBSD 10.3. +ac_fn_c_check_member "$LINENO" "struct ptrace_lwpinfo" "pl_syscall_code" "ac_cv_member_struct_ptrace_lwpinfo_pl_syscall_code" "#include <sys/ptrace.h> +" +if test "x$ac_cv_member_struct_ptrace_lwpinfo_pl_syscall_code" = x""yes; then : + +cat >>confdefs.h <<_ACEOF +#define HAVE_STRUCT_PTRACE_LWPINFO_PL_SYSCALL_CODE 1 +_ACEOF + + +fi + # Detect which type of /proc is in use, such as for Solaris. |