diff options
Diffstat (limited to 'arch/mips/kernel/signal.c')
| -rw-r--r-- | arch/mips/kernel/signal.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c index 9cb75e9519c5..3101bafd3a9c 100644 --- a/arch/mips/kernel/signal.c +++ b/arch/mips/kernel/signal.c @@ -47,8 +47,11 @@ static int (*restore_fp_context)(void __user *sc); struct sigframe { u32 sf_ass[4]; /* argument save space for o32 */ u32 sf_pad[2]; /* Was: signal trampoline */ + + /* Matches struct ucontext from its uc_mcontext field onwards */ struct sigcontext sf_sc; sigset_t sf_mask; + unsigned long long sf_extcontext[0]; }; struct rt_sigframe { @@ -686,6 +689,16 @@ static int smp_restore_fp_context(void __user *sc) static int signal_setup(void) { + /* + * The offset from sigcontext to extended context should be the same + * regardless of the type of signal, such that userland can always know + * where to look if it wishes to find the extended context structures. + */ + BUILD_BUG_ON((offsetof(struct sigframe, sf_extcontext) - + offsetof(struct sigframe, sf_sc)) != + (offsetof(struct rt_sigframe, rs_uc.uc_extcontext) - + offsetof(struct rt_sigframe, rs_uc.uc_mcontext))); + #ifdef CONFIG_SMP /* For now just do the cpu_has_fpu check when the functions are invoked */ save_fp_context = smp_save_fp_context; |