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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include "lint.h"
#include "thr_uberdata.h"
#include <procfs.h>
#include <ucontext.h>
#include <setjmp.h>
extern int getlwpstatus(thread_t, lwpstatus_t *);
extern int putlwpregs(thread_t, prgregset_t);
/* ARGSUSED2 */
void *
setup_top_frame(void *stk, size_t stksize, ulwp_t *ulwp)
{
uint64_t *stack;
struct {
uint64_t rpc;
uint64_t fp;
uint64_t pc;
} frame;
/*
* Top-of-stack must be rounded down to STACK_ALIGN and
* there must be a minimum frame.
*/
stack = (uint64_t *)(((uintptr_t)stk + stksize) & ~(STACK_ALIGN-1));
/*
* This will return NULL if the kernel cannot allocate
* a page for the top page of the stack. This will cause
* thr_create(), pthread_create() or pthread_attr_setstack()
* to fail, passing the problem up to the application.
*/
stack -= 3;
frame.pc = 0;
frame.fp = 0;
frame.rpc = (uint64_t)_lwp_start;
if (uucopy(&frame, stack, sizeof (frame)) == 0)
return (stack);
return (NULL);
}
int
setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *),
ulwp_t *ulwp, caddr_t stk, size_t stksize)
{
uint64_t *stack;
/* clear the context */
(void) memset(ucp, 0, sizeof (*ucp));
/* setup to store the current thread pointer in %fs */
ucp->uc_mcontext.gregs[REG_FSBASE] = (greg_t)ulwp;
ucp->uc_mcontext.gregs[REG_FS] = 0; /* null selector indicates fsbase */
/* all contexts should have a valid data segment descriptor for %ss */
ucp->uc_mcontext.gregs[REG_SS] = UDS_SEL;
/*
* Setup the top stack frame.
* If this fails, pass the problem up to the application.
*/
if ((stack = setup_top_frame(stk, stksize, ulwp)) == NULL)
return (ENOMEM);
/* fill in registers of interest */
ucp->uc_flags |= UC_CPU;
ucp->uc_mcontext.gregs[REG_RDI] = (greg_t)ulwp;
ucp->uc_mcontext.gregs[REG_RIP] = (greg_t)func;
ucp->uc_mcontext.gregs[REG_RSP] = (greg_t)stack;
ucp->uc_mcontext.gregs[REG_RBP] = (greg_t)(stack + 1);
return (0);
}
/*
* Machine-dependent startup code for a newly-created thread.
*/
void *
_thrp_setup(ulwp_t *self)
{
self->ul_ustack.ss_sp = (void *)(self->ul_stktop - self->ul_stksiz);
self->ul_ustack.ss_size = self->ul_stksiz;
self->ul_ustack.ss_flags = 0;
(void) setustack(&self->ul_ustack);
update_sched(self);
tls_setup();
/* signals have been deferred until now */
sigon(self);
if (self->ul_cancel_pending == 2 && !self->ul_cancel_disabled)
return (NULL); /* cancelled by pthread_create() */
return (self->ul_startpc(self->ul_startarg));
}
void
_fpinherit(ulwp_t *ulwp)
{
ulwp->ul_fpuenv.ftag = 0xffffffff;
}
void
getgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
rs[REG_RBX] = status.pr_reg[REG_RBX];
rs[REG_R12] = status.pr_reg[REG_R12];
rs[REG_R13] = status.pr_reg[REG_R13];
rs[REG_R14] = status.pr_reg[REG_R14];
rs[REG_R15] = status.pr_reg[REG_R15];
rs[REG_RBP] = status.pr_reg[REG_RBP];
rs[REG_RSP] = status.pr_reg[REG_RSP];
rs[REG_RIP] = status.pr_reg[REG_RIP];
} else {
rs[REG_RBX] = 0;
rs[REG_R12] = 0;
rs[REG_R13] = 0;
rs[REG_R14] = 0;
rs[REG_R15] = 0;
rs[REG_RBP] = 0;
rs[REG_RSP] = 0;
rs[REG_RIP] = 0;
}
}
void
setgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
status.pr_reg[REG_RBX] = rs[REG_RBX];
status.pr_reg[REG_R12] = rs[REG_R12];
status.pr_reg[REG_R13] = rs[REG_R13];
status.pr_reg[REG_R14] = rs[REG_R14];
status.pr_reg[REG_R15] = rs[REG_R15];
status.pr_reg[REG_RBP] = rs[REG_RBP];
status.pr_reg[REG_RSP] = rs[REG_RSP];
status.pr_reg[REG_RIP] = rs[REG_RIP];
(void) putlwpregs(ulwp->ul_lwpid, status.pr_reg);
}
}
int
__csigsetjmp(sigjmp_buf env, int savemask, gregset_t rs)
{
/* LINTED alignment */
ucontext_t *ucp = (ucontext_t *)env;
ulwp_t *self = curthread;
ucp->uc_link = self->ul_siglink;
if (self->ul_ustack.ss_flags & SS_ONSTACK)
ucp->uc_stack = self->ul_ustack;
else {
ucp->uc_stack.ss_sp =
(void *)(self->ul_stktop - self->ul_stksiz);
ucp->uc_stack.ss_size = self->ul_stksiz;
ucp->uc_stack.ss_flags = 0;
}
ucp->uc_flags = UC_STACK | UC_CPU;
if (savemask) {
ucp->uc_flags |= UC_SIGMASK;
enter_critical(self);
ucp->uc_sigmask = self->ul_sigmask;
exit_critical(self);
}
(void) memcpy(ucp->uc_mcontext.gregs, rs, _NGREG * sizeof (greg_t));
return (0);
}
void
smt_pause(void)
{
SMT_PAUSE();
}
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