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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) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
*/
#include "lint.h"
#include "thr_uberdata.h"
#include <procfs.h>
#include <setjmp.h>
#include <sys/fsr.h>
#include "sigjmp_struct.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)
{
uintptr_t stack;
char frame[SA(MINFRAME)];
/*
* Top-of-stack must be rounded down to STACK_ALIGN and
* there must be a minimum frame for the register window.
*/
stack = (((uintptr_t)stk + stksize) & ~(STACK_ALIGN - 1)) -
SA(MINFRAME);
/*
* 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.
*/
(void) memset(frame, 0, sizeof (frame));
if (uucopy(frame, (void *)stack, sizeof (frame)) == 0)
return ((void *)stack);
return (NULL);
}
int
setup_context(ucontext_t *ucp, void *(*func)(ulwp_t *),
ulwp_t *ulwp, caddr_t stk, size_t stksize)
{
uintptr_t stack;
/* clear the context */
(void) memset(ucp, 0, sizeof (*ucp));
/*
* Clear the top stack frame.
* If this fails, pass the problem up to the application.
*/
stack = (uintptr_t)setup_top_frame(stk, stksize, ulwp);
if (stack == (uintptr_t)NULL)
return (ENOMEM);
/* fill in registers of interest */
ucp->uc_flags |= UC_CPU;
ucp->uc_mcontext.gregs[REG_PC] = (greg_t)func;
ucp->uc_mcontext.gregs[REG_nPC] = (greg_t)func + 4;
ucp->uc_mcontext.gregs[REG_O0] = (greg_t)ulwp;
ucp->uc_mcontext.gregs[REG_SP] = (greg_t)(stack - STACK_BIAS);
ucp->uc_mcontext.gregs[REG_O7] = (greg_t)_lwp_start;
ucp->uc_mcontext.gregs[REG_G7] = (greg_t)ulwp;
return (0);
}
/*
* Machine-dependent startup code for a newly-created thread.
*/
void *
_thrp_setup(ulwp_t *self)
{
extern void _setfsr(greg_t *);
if (self->ul_fpuenv.fpu_en)
_setfsr(&self->ul_fpuenv.fsr);
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)
{
extern void _getfsr(greg_t *);
int fpu_enabled;
#ifdef __sparcv9
extern greg_t _getfprs();
fpu_enabled = _getfprs() & FPRS_FEF;
#else
extern psw_t _getpsr();
fpu_enabled = _getpsr() & PSR_EF;
#endif /* __sparcv9 */
if (fpu_enabled) {
_getfsr(&ulwp->ul_fpuenv.fsr);
ulwp->ul_fpuenv.fpu_en = 1;
} else {
ulwp->ul_fpuenv.fpu_en = 0;
}
}
void
getgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
rs[REG_PC] = status.pr_reg[R_PC];
rs[REG_O6] = status.pr_reg[R_O6];
rs[REG_O7] = status.pr_reg[R_O7];
rs[REG_G1] = status.pr_reg[R_G1];
rs[REG_G2] = status.pr_reg[R_G2];
rs[REG_G3] = status.pr_reg[R_G3];
rs[REG_G4] = status.pr_reg[R_G4];
} else {
rs[REG_PC] = 0;
rs[REG_O6] = 0;
rs[REG_O7] = 0;
rs[REG_G1] = 0;
rs[REG_G2] = 0;
rs[REG_G3] = 0;
rs[REG_G4] = 0;
}
}
void
setgregs(ulwp_t *ulwp, gregset_t rs)
{
lwpstatus_t status;
if (getlwpstatus(ulwp->ul_lwpid, &status) == 0) {
status.pr_reg[R_PC] = rs[REG_PC];
status.pr_reg[R_O6] = rs[REG_O6];
status.pr_reg[R_O7] = rs[REG_O7];
status.pr_reg[R_G1] = rs[REG_G1];
status.pr_reg[R_G2] = rs[REG_G2];
status.pr_reg[R_G3] = rs[REG_G3];
status.pr_reg[R_G4] = rs[REG_G4];
(void) putlwpregs(ulwp->ul_lwpid, status.pr_reg);
}
}
int
__csigsetjmp(sigjmp_buf env, int savemask)
{
sigjmp_struct_t *bp = (sigjmp_struct_t *)env;
ulwp_t *self = curthread;
/*
* bp->sjs_sp, bp->sjs_pc, bp->sjs_fp and bp->sjs_i7 are already set.
* Also, if we are running in 64-bit mode (__sparcv9),
* then bp->sjs_asi and bp->sjs_fprs are already set.
*/
bp->sjs_flags = JB_FRAMEPTR;
bp->sjs_uclink = self->ul_siglink;
if (self->ul_ustack.ss_flags & SS_ONSTACK)
bp->sjs_stack = self->ul_ustack;
else {
bp->sjs_stack.ss_sp =
(void *)(self->ul_stktop - self->ul_stksiz);
bp->sjs_stack.ss_size = self->ul_stksiz;
bp->sjs_stack.ss_flags = 0;
}
if (savemask) {
bp->sjs_flags |= JB_SAVEMASK;
enter_critical(self);
bp->sjs_sigmask = self->ul_sigmask;
exit_critical(self);
}
return (0);
}
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