COPY(r14);
COPY(r15);
+ /* Kernel saves and restores only the CS segment register on signals,
+ * which is the bare minimum needed to allow mixed 32/64-bit code.
+ * App's signal handler can save/restore other segments if needed. */
+ {
+ unsigned cs;
+ err |= __get_user(cs, &sc->cs);
+ regs->cs = cs | 3; /* Force into user mode */
+ }
+
{
unsigned int tmpflags;
err |= __get_user(tmpflags, &sc->eflags);
{
int err = 0;
+ err |= __put_user(regs->cs, &sc->cs);
err |= __put_user(0, &sc->gs);
err |= __put_user(0, &sc->fs);
regs->rsp = (unsigned long)frame;
+ /* Set up the CS register to run signal handlers in 64-bit mode,
+ even if the handler happens to be interrupting 32-bit code. */
+ regs->cs = __USER_CS;
+
+ /* This, by contrast, has nothing to do with segment registers -
+ see include/asm-x86_64/uaccess.h for details. */
set_fs(USER_DS);
+
regs->eflags &= ~TF_MASK;
if (test_thread_flag(TIF_SINGLESTEP))
ptrace_notify(SIGTRAP);
#endif
ret = setup_rt_frame(sig, ka, info, oldset, regs);
- if (ret && !(ka->sa.sa_flags & SA_NODEFER)) {
+ if (ret) {
spin_lock_irq(¤t->sighand->siglock);
sigorsets(¤t->blocked,¤t->blocked,&ka->sa.sa_mask);
- sigaddset(¤t->blocked,sig);
+ if (!(ka->sa.sa_flags & SA_NODEFER))
+ sigaddset(¤t->blocked,sig);
recalc_sigpending();
spin_unlock_irq(¤t->sighand->siglock);
}