[src/trunk]: src/sys/arch/alpha Add _UC_SETSTACK / _UC_CLRSTACK handling. Fi...

[thorpej <thorpej%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/770165415dc5
branches:  trunk
changeset: 379267:770165415dc5
user:      thorpej <thorpej%NetBSD.org@localhost>
date:      Mon May 24 21:00:12 2021 +0000

description:
Add _UC_SETSTACK / _UC_CLRSTACK handling.  Fixes the t_sigaltstack test
on alpha.

diffstat:

 sys/arch/alpha/alpha/machdep.c    |  15 +++++++++++++--
 sys/arch/alpha/include/mcontext.h |   4 +++-
 2 files changed, 16 insertions(+), 3 deletions(-)

diffs (70 lines):

diff -r d04259671b92 -r 770165415dc5 sys/arch/alpha/alpha/machdep.c
--- a/sys/arch/alpha/alpha/machdep.c    Mon May 24 13:43:21 2021 +0000
+++ b/sys/arch/alpha/alpha/machdep.c    Mon May 24 21:00:12 2021 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.371 2021/05/05 15:36:17 thorpej Exp $ */
+/* $NetBSD: machdep.c,v 1.372 2021/05/24 21:00:12 thorpej Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999, 2000, 2019, 2020 The NetBSD Foundation, Inc.
@@ -67,7 +67,7 @@
 
 #include <sys/cdefs.h>                 /* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.371 2021/05/05 15:36:17 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.372 2021/05/24 21:00:12 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -1525,6 +1525,8 @@ sendsig_siginfo(const ksiginfo_t *ksi, c
        frame.sf_uc.uc_flags = _UC_SIGMASK;
        frame.sf_uc.uc_sigmask = *mask;
        frame.sf_uc.uc_link = l->l_ctxlink;
+       frame.sf_uc.uc_flags |= (l->l_sigstk.ss_flags & SS_ONSTACK)
+           ? _UC_SETSTACK : _UC_CLRSTACK;
        sendsig_reset(l, sig);
        mutex_exit(p->p_lock);
        cpu_getmcontext(l, &frame.sf_uc.uc_mcontext, &frame.sf_uc.uc_flags);
@@ -1885,8 +1887,10 @@ cpu_setmcontext(struct lwp *l, const mco
                frame->tf_regs[FRAME_PC] = gr[_REG_PC];
                frame->tf_regs[FRAME_PS] = gr[_REG_PS];
        }
+
        if (flags & _UC_TLSBASE)
                lwp_setprivate(l, (void *)(uintptr_t)gr[_REG_UNIQUE]);
+
        /* Restore floating point register context, if any. */
        if (flags & _UC_FPU) {
                /* If we have an FP register context, get rid of it. */
@@ -1896,6 +1900,13 @@ cpu_setmcontext(struct lwp *l, const mco
                l->l_md.md_flags = mcp->__fpregs.__fp_fpcr & MDLWP_FP_C;
        }
 
+       mutex_enter(l->l_proc->p_lock);
+       if (flags & _UC_SETSTACK)
+               l->l_sigstk.ss_flags |= SS_ONSTACK;
+       if (flags & _UC_CLRSTACK)
+               l->l_sigstk.ss_flags &= ~SS_ONSTACK;
+       mutex_exit(l->l_proc->p_lock);
+
        return (0);
 }
 
diff -r d04259671b92 -r 770165415dc5 sys/arch/alpha/include/mcontext.h
--- a/sys/arch/alpha/include/mcontext.h Mon May 24 13:43:21 2021 +0000
+++ b/sys/arch/alpha/include/mcontext.h Mon May 24 21:00:12 2021 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: mcontext.h,v 1.10 2019/12/27 00:32:16 kamil Exp $      */
+/*     $NetBSD: mcontext.h,v 1.11 2021/05/24 21:00:12 thorpej Exp $    */
 
 /*-
  * Copyright (c) 2001 The NetBSD Foundation, Inc.
@@ -94,6 +94,8 @@ typedef struct {
 
 /* Machine-dependent uc_flags */
 #define _UC_TLSBASE    0x20    /* valid process-unique value in _REG_UNIQUE */
+#define _UC_SETSTACK   0x00010000
+#define _UC_CLRSTACK   0x00020000
 
 #define _UC_MACHINE_SP(uc)     ((uc)->uc_mcontext.__gregs[_REG_SP])
 #define _UC_MACHINE_FP(uc)     ((uc)->uc_mcontext.__gregs[_REG_S6])