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/*-
* Copyright (c) 2002 Daniel Eischen <deischen@freebsd.org>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
/*
* Machine-dependent thread prototypes/definitions for the thread kernel.
*/
#ifndef _PTHREAD_MD_H_
#define _PTHREAD_MD_H_
#include <stddef.h>
#include <sys/types.h>
#include <sys/kse.h>
#include <machine/sysarch.h>
#include <ucontext.h>
extern int _thr_setcontext(mcontext_t *, intptr_t, intptr_t *);
extern int _thr_getcontext(mcontext_t *);
#define KSE_STACKSIZE 16384
#define DTV_OFFSET offsetof(struct tcb, tcb_dtv)
#define THR_GETCONTEXT(ucp) _thr_getcontext(&(ucp)->uc_mcontext)
#define THR_SETCONTEXT(ucp) _thr_setcontext(&(ucp)->uc_mcontext, 0, NULL)
#define PER_KSE
#undef PER_THREAD
struct kse;
struct pthread;
/*
* %gs points to a struct kcb.
*/
struct kcb {
struct tcb *kcb_curtcb;
struct kcb *kcb_self; /* self reference */
struct kse *kcb_kse;
struct kse_mailbox kcb_kmbx;
};
struct tcb {
struct tcb *tcb_self; /* required by rtld */
void *tcb_dtv; /* required by rtld */
struct pthread *tcb_thread;
void *tcb_spare; /* align tcb_tmbx to 16 bytes */
struct kse_thr_mailbox tcb_tmbx;
};
/*
* Evaluates to the byte offset of the per-kse variable name.
*/
#define __kcb_offset(name) __offsetof(struct kcb, name)
/*
* Evaluates to the type of the per-kse variable name.
*/
#define __kcb_type(name) __typeof(((struct kcb *)0)->name)
/*
* Evaluates to the value of the per-kse variable name.
*/
#define KCB_GET32(name) ({ \
__kcb_type(name) __result; \
\
u_int __i; \
__asm __volatile("movl %%gs:%1, %0" \
: "=r" (__i) \
: "m" (*(u_int *)(__kcb_offset(name)))); \
__result = (__kcb_type(name))__i; \
\
__result; \
})
/*
* Sets the value of the per-kse variable name to value val.
*/
#define KCB_SET32(name, val) ({ \
__kcb_type(name) __val = (val); \
\
u_int __i; \
__i = (u_int)__val; \
__asm __volatile("movl %1,%%gs:%0" \
: "=m" (*(u_int *)(__kcb_offset(name))) \
: "r" (__i)); \
})
static __inline u_long
__kcb_readandclear32(volatile u_long *addr)
{
u_long result;
__asm __volatile (
" xorl %0, %0;"
" xchgl %%gs:%1, %0;"
"# __kcb_readandclear32"
: "=&r" (result)
: "m" (*addr));
return (result);
}
#define KCB_READANDCLEAR32(name) ({ \
__kcb_type(name) __result; \
\
__result = (__kcb_type(name)) \
__kcb_readandclear32((u_long *)__kcb_offset(name)); \
__result; \
})
#define _kcb_curkcb() KCB_GET32(kcb_self)
#define _kcb_curtcb() KCB_GET32(kcb_curtcb)
#define _kcb_curkse() ((struct kse *)KCB_GET32(kcb_kmbx.km_udata))
#define _kcb_get_tmbx() KCB_GET32(kcb_kmbx.km_curthread)
#define _kcb_set_tmbx(value) KCB_SET32(kcb_kmbx.km_curthread, (void *)value)
#define _kcb_readandclear_tmbx() KCB_READANDCLEAR32(kcb_kmbx.km_curthread)
/*
* The constructors.
*/
struct tcb *_tcb_ctor(struct pthread *, int);
void _tcb_dtor(struct tcb *tcb);
struct kcb *_kcb_ctor(struct kse *);
void _kcb_dtor(struct kcb *);
/* Called from the KSE to set its private data. */
static __inline void
_kcb_set(struct kcb *kcb)
{
i386_set_gsbase(kcb);
}
/* Get the current kcb. */
static __inline struct kcb *
_kcb_get(void)
{
return (_kcb_curkcb());
}
static __inline struct kse_thr_mailbox *
_kcb_critical_enter(void)
{
struct kse_thr_mailbox *crit;
crit = _kcb_readandclear_tmbx();
return (crit);
}
static __inline void
_kcb_critical_leave(struct kse_thr_mailbox *crit)
{
_kcb_set_tmbx(crit);
}
static __inline int
_kcb_in_critical(void)
{
return (_kcb_get_tmbx() == NULL);
}
static __inline void
_tcb_set(struct kcb *kcb, struct tcb *tcb)
{
kcb->kcb_curtcb = tcb;
}
static __inline struct tcb *
_tcb_get(void)
{
return (_kcb_curtcb());
}
static __inline struct pthread *
_get_curthread(void)
{
struct tcb *tcb;
tcb = _kcb_curtcb();
if (tcb != NULL)
return (tcb->tcb_thread);
else
return (NULL);
}
static __inline struct kse *
_get_curkse(void)
{
return ((struct kse *)_kcb_curkse());
}
void _i386_enter_uts(struct kse_mailbox *km, kse_func_t uts, void *stack,
size_t stacksz);
static __inline int
_thread_enter_uts(struct tcb *tcb, struct kcb *kcb)
{
int ret;
ret = _thr_getcontext(&tcb->tcb_tmbx.tm_context.uc_mcontext);
if (ret == 0) {
_i386_enter_uts(&kcb->kcb_kmbx, kcb->kcb_kmbx.km_func,
kcb->kcb_kmbx.km_stack.ss_sp,
kcb->kcb_kmbx.km_stack.ss_size);
/* We should not reach here. */
return (-1);
}
else if (ret < 0)
return (-1);
return (0);
}
static __inline int
_thread_switch(struct kcb *kcb, struct tcb *tcb, int setmbox)
{
extern int _libkse_debug;
if ((kcb == NULL) || (tcb == NULL))
return (-1);
kcb->kcb_curtcb = tcb;
if (_libkse_debug == 0) {
tcb->tcb_tmbx.tm_lwp = kcb->kcb_kmbx.km_lwp;
if (setmbox != 0)
_thr_setcontext(&tcb->tcb_tmbx.tm_context.uc_mcontext,
(intptr_t)&tcb->tcb_tmbx,
(intptr_t *)(void *)&kcb->kcb_kmbx.km_curthread);
else
_thr_setcontext(&tcb->tcb_tmbx.tm_context.uc_mcontext,
0, NULL);
} else {
if (setmbox)
kse_switchin(&tcb->tcb_tmbx, KSE_SWITCHIN_SETTMBX);
else
kse_switchin(&tcb->tcb_tmbx, 0);
}
/* We should not reach here. */
return (-1);
}
#endif
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