arch/tile: apply commit 74fca9da0 to the compat signal handling as well

This passes siginfo and mcontext to tilegx32 signal handlers that
don't have SA_SIGINFO set just as we have been doing for tilegx64.

Cc: stable@vger.kernel.org
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

diff --git a/arch/tile/kernel/compat_signal.c b/arch/tile/kernel/compat_signal.c
index 77763cc..cdef6e5 100644 (file)
--- a/arch/tile/kernel/compat_signal.c
+++ b/arch/tile/kernel/compat_signal.c
@@ -403,19 +403,17 @@ int compat_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         * Set up registers for signal handler.
         * Registers that we don't modify keep the value they had from
         * user-space at the time we took the signal.
+        * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
+        * since some things rely on this (e.g. glibc's debug/segfault.c).
         */
        regs->pc = ptr_to_compat_reg(ka->sa.sa_handler);
        regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
        regs->sp = ptr_to_compat_reg(frame);
        regs->lr = restorer;
        regs->regs[0] = (unsigned long) usig;
-
-       if (ka->sa.sa_flags & SA_SIGINFO) {
-               /* Need extra arguments, so mark to restore caller-saves. */
-               regs->regs[1] = ptr_to_compat_reg(&frame->info);
-               regs->regs[2] = ptr_to_compat_reg(&frame->uc);
-               regs->flags |= PT_FLAGS_CALLER_SAVES;
-       }
+       regs->regs[1] = ptr_to_compat_reg(&frame->info);
+       regs->regs[2] = ptr_to_compat_reg(&frame->uc);
+       regs->flags |= PT_FLAGS_CALLER_SAVES;
 
        /*
         * Notify any tracer that was single-stepping it.