From 41b3e8b9893a8561af7e85ca98444bc284b4013d Mon Sep 17 00:00:00 2001 From: Russ Cox Date: Sun, 19 Jan 2020 22:39:22 -0500 Subject: libthread: use consistent stack calculation code in makecontext Also reduce duplication: makecontext is per-arch not per-os-arch. May fix #353. --- src/libthread/sparc64-ucontext.c | 49 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 src/libthread/sparc64-ucontext.c (limited to 'src/libthread/sparc64-ucontext.c') diff --git a/src/libthread/sparc64-ucontext.c b/src/libthread/sparc64-ucontext.c new file mode 100644 index 00000000..e4800c19 --- /dev/null +++ b/src/libthread/sparc64-ucontext.c @@ -0,0 +1,49 @@ +/* Copyright (C) 2001 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Jakub Jelinek . + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include + +#define UC_M_PC 40 +#define UC_M_NPC 48 + +extern int __getcontext (ucontext_t *ucp); +extern int __setcontext (const ucontext_t *ucp, int restoremask); + +int +swapcontext (ucontext_t *oucp, const ucontext_t *ucp) +{ + extern void __swapcontext_ret (void); + /* Save the current machine context to oucp. */ + __getcontext (oucp); + /* Modify oucp to skip the __setcontext call on reactivation. */ + *(long*)((char*)oucp+UC_M_PC) = (long)__swapcontext_ret; + *(long*)((char*)oucp+UC_M_NPC) = (long)__swapcontext_ret + 4; + /* Restore the machine context in ucp. */ + __setcontext (ucp, 1); + return 0; +} + +asm (" \n\ + .text \n\ + .type __swapcontext_ret, #function \n\ +__swapcontext_ret: \n\ + return %i7 + 8 \n\ + clr %o0 \n\ + .size __swapcontext_ret, .-__swapcontext_ret \n\ + "); -- cgit v1.2.3