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authorRajithaY <rajithax.yerrumsetty@intel.com>2017-04-25 03:31:15 -0700
committerRajitha Yerrumchetty <rajithax.yerrumsetty@intel.com>2017-05-22 06:48:08 +0000
commitbb756eebdac6fd24e8919e2c43f7d2c8c4091f59 (patch)
treeca11e03542edf2d8f631efeca5e1626d211107e3 /qemu/util/coroutine-ucontext.c
parenta14b48d18a9ed03ec191cf16b162206998a895ce (diff)
Adding qemu as a submodule of KVMFORNFV
This Patch includes the changes to add qemu as a submodule to kvmfornfv repo and make use of the updated latest qemu for the execution of all testcase Change-Id: I1280af507a857675c7f81d30c95255635667bdd7 Signed-off-by:RajithaY<rajithax.yerrumsetty@intel.com>
Diffstat (limited to 'qemu/util/coroutine-ucontext.c')
-rw-r--r--qemu/util/coroutine-ucontext.c192
1 files changed, 0 insertions, 192 deletions
diff --git a/qemu/util/coroutine-ucontext.c b/qemu/util/coroutine-ucontext.c
deleted file mode 100644
index 2bb7e10d4..000000000
--- a/qemu/util/coroutine-ucontext.c
+++ /dev/null
@@ -1,192 +0,0 @@
-/*
- * ucontext coroutine initialization code
- *
- * Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
- * Copyright (C) 2011 Kevin Wolf <kwolf@redhat.com>
- *
- * This 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 2.0 of the License, or (at your option) any later version.
- *
- * This 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 this library; if not, see <http://www.gnu.org/licenses/>.
- */
-
-/* XXX Is there a nicer way to disable glibc's stack check for longjmp? */
-#ifdef _FORTIFY_SOURCE
-#undef _FORTIFY_SOURCE
-#endif
-#include "qemu/osdep.h"
-#include <ucontext.h>
-#include "qemu-common.h"
-#include "qemu/coroutine_int.h"
-
-#ifdef CONFIG_VALGRIND_H
-#include <valgrind/valgrind.h>
-#endif
-
-typedef struct {
- Coroutine base;
- void *stack;
- sigjmp_buf env;
-
-#ifdef CONFIG_VALGRIND_H
- unsigned int valgrind_stack_id;
-#endif
-
-} CoroutineUContext;
-
-/**
- * Per-thread coroutine bookkeeping
- */
-static __thread CoroutineUContext leader;
-static __thread Coroutine *current;
-
-/*
- * va_args to makecontext() must be type 'int', so passing
- * the pointer we need may require several int args. This
- * union is a quick hack to let us do that
- */
-union cc_arg {
- void *p;
- int i[2];
-};
-
-static void coroutine_trampoline(int i0, int i1)
-{
- union cc_arg arg;
- CoroutineUContext *self;
- Coroutine *co;
-
- arg.i[0] = i0;
- arg.i[1] = i1;
- self = arg.p;
- co = &self->base;
-
- /* Initialize longjmp environment and switch back the caller */
- if (!sigsetjmp(self->env, 0)) {
- siglongjmp(*(sigjmp_buf *)co->entry_arg, 1);
- }
-
- while (true) {
- co->entry(co->entry_arg);
- qemu_coroutine_switch(co, co->caller, COROUTINE_TERMINATE);
- }
-}
-
-Coroutine *qemu_coroutine_new(void)
-{
- const size_t stack_size = 1 << 20;
- CoroutineUContext *co;
- ucontext_t old_uc, uc;
- sigjmp_buf old_env;
- union cc_arg arg = {0};
-
- /* The ucontext functions preserve signal masks which incurs a
- * system call overhead. sigsetjmp(buf, 0)/siglongjmp() does not
- * preserve signal masks but only works on the current stack.
- * Since we need a way to create and switch to a new stack, use
- * the ucontext functions for that but sigsetjmp()/siglongjmp() for
- * everything else.
- */
-
- if (getcontext(&uc) == -1) {
- abort();
- }
-
- co = g_malloc0(sizeof(*co));
- co->stack = g_malloc(stack_size);
- co->base.entry_arg = &old_env; /* stash away our jmp_buf */
-
- uc.uc_link = &old_uc;
- uc.uc_stack.ss_sp = co->stack;
- uc.uc_stack.ss_size = stack_size;
- uc.uc_stack.ss_flags = 0;
-
-#ifdef CONFIG_VALGRIND_H
- co->valgrind_stack_id =
- VALGRIND_STACK_REGISTER(co->stack, co->stack + stack_size);
-#endif
-
- arg.p = co;
-
- makecontext(&uc, (void (*)(void))coroutine_trampoline,
- 2, arg.i[0], arg.i[1]);
-
- /* swapcontext() in, siglongjmp() back out */
- if (!sigsetjmp(old_env, 0)) {
- swapcontext(&old_uc, &uc);
- }
- return &co->base;
-}
-
-#ifdef CONFIG_VALGRIND_H
-#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
-/* Work around an unused variable in the valgrind.h macro... */
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wunused-but-set-variable"
-#endif
-static inline void valgrind_stack_deregister(CoroutineUContext *co)
-{
- VALGRIND_STACK_DEREGISTER(co->valgrind_stack_id);
-}
-#ifdef CONFIG_PRAGMA_DIAGNOSTIC_AVAILABLE
-#pragma GCC diagnostic pop
-#endif
-#endif
-
-void qemu_coroutine_delete(Coroutine *co_)
-{
- CoroutineUContext *co = DO_UPCAST(CoroutineUContext, base, co_);
-
-#ifdef CONFIG_VALGRIND_H
- valgrind_stack_deregister(co);
-#endif
-
- g_free(co->stack);
- g_free(co);
-}
-
-/* This function is marked noinline to prevent GCC from inlining it
- * into coroutine_trampoline(). If we allow it to do that then it
- * hoists the code to get the address of the TLS variable "current"
- * out of the while() loop. This is an invalid transformation because
- * the sigsetjmp() call may be called when running thread A but
- * return in thread B, and so we might be in a different thread
- * context each time round the loop.
- */
-CoroutineAction __attribute__((noinline))
-qemu_coroutine_switch(Coroutine *from_, Coroutine *to_,
- CoroutineAction action)
-{
- CoroutineUContext *from = DO_UPCAST(CoroutineUContext, base, from_);
- CoroutineUContext *to = DO_UPCAST(CoroutineUContext, base, to_);
- int ret;
-
- current = to_;
-
- ret = sigsetjmp(from->env, 0);
- if (ret == 0) {
- siglongjmp(to->env, action);
- }
- return ret;
-}
-
-Coroutine *qemu_coroutine_self(void)
-{
- if (!current) {
- current = &leader.base;
- }
- return current;
-}
-
-bool qemu_in_coroutine(void)
-{
- return current && current->caller;
-}