From: Andrew Cagney Date: Tue, 26 Aug 2003 19:34:53 +0000 (+0000) Subject: 2003-08-26 Andrew Cagney X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=cc7ad3eab346356ca03eab6d987401d12fbffd45;p=binutils-gdb.git 2003-08-26 Andrew Cagney * i386-linux-nat.c (ps_get_thread_area): Make "desc" four "int"s in size. Add comments. --- diff --git a/gdb/ChangeLog b/gdb/ChangeLog index 7d68388e238..2ea6ae5b09c 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2003-08-26 Andrew Cagney + + * i386-linux-nat.c (ps_get_thread_area): Make "desc" four "int"s + in size. Add comments. + 2003-08-26 Jeff Johnston * ia64-tdep.c (ia64_convert_from_func_addr): New function. diff --git a/gdb/i386-linux-nat.c b/gdb/i386-linux-nat.c index 4e348d9dc70..dbf91b7658e 100644 --- a/gdb/i386-linux-nat.c +++ b/gdb/i386-linux-nat.c @@ -687,11 +687,31 @@ i386_linux_dr_set (int regnum, unsigned long value) perror_with_name ("Couldn't write debug register"); } +/* Called by libthread_db. Return's a pointer to the thread local + storage (or it's descriptor). */ extern ps_err_e ps_get_thread_area(const struct ps_prochandle *ph, lwpid_t lwpid, int idx, void **base) { - unsigned long int desc[3]; + /* NOTE: cagney/2003-08-26: The definition of this buffer is found + in the kernel header . It, after padding, is 4 x + 4 byte integers in size: "entry_number", "base_addr", "limit", + and a bunch of status bits. + + The values returned by this ptrace call should be part of the + regcache buffer, and ps_get_thread_area should channel its + request through the regcache. That way remote targets could + provide the value using the remote protocol and not this direct + call. + + Is this function needed? I'm guessing that the "base" is the + address of a a descriptor that libthread_db uses to find the + thread local address base that GDB needs. Perhaphs that + descriptor is defined by the ABI. Anyway, given that + libthread_db calls this function without prompting (gdb + requesting tls base) I guess it needs info in there anyway. */ + unsigned int desc[4]; + gdb_assert (sizeof (int) == 4); #define PTRACE_GET_THREAD_AREA 25 if (ptrace (PTRACE_GET_THREAD_AREA,