diff options
Diffstat (limited to 'gdb/x86-linux-nat.c')
| -rw-r--r-- | gdb/x86-linux-nat.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/gdb/x86-linux-nat.c b/gdb/x86-linux-nat.c index 9d82be2..c58c01a 100644 --- a/gdb/x86-linux-nat.c +++ b/gdb/x86-linux-nat.c @@ -51,6 +51,16 @@ struct arch_lwp_info int have_ptrace_getregset = -1; +/* Return the offset of REGNUM in the u_debugreg field of struct + user. */ + +static int +u_debugreg_offset (int regnum) +{ + return (offsetof (struct user, u_debugreg) + + sizeof (((struct user *) 0)->u_debugreg[0]) * regnum); +} + /* Support for debug registers. */ /* Get debug register REGNUM value from only the one LWP of PTID. */ @@ -65,8 +75,8 @@ x86_linux_dr_get (ptid_t ptid, int regnum) tid = ptid_get_lwp (ptid); errno = 0; - value = ptrace (PTRACE_PEEKUSER, tid, - offsetof (struct user, u_debugreg[regnum]), 0); + value = ptrace (PTRACE_PEEKUSER, tid, u_debugreg_offset (regnum), 0); + if (errno != 0) perror_with_name (_("Couldn't read debug register")); @@ -84,8 +94,7 @@ x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value) tid = ptid_get_lwp (ptid); errno = 0; - ptrace (PTRACE_POKEUSER, tid, - offsetof (struct user, u_debugreg[regnum]), value); + ptrace (PTRACE_POKEUSER, tid, u_debugreg_offset (regnum), value); if (errno != 0) perror_with_name (_("Couldn't write debug register")); } |