diff options
Diffstat (limited to 'usr/src/uts/intel/ia32/syscall/lwp_private.c')
| -rw-r--r-- | usr/src/uts/intel/ia32/syscall/lwp_private.c | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/usr/src/uts/intel/ia32/syscall/lwp_private.c b/usr/src/uts/intel/ia32/syscall/lwp_private.c deleted file mode 100644 index 50331a2899..0000000000 --- a/usr/src/uts/intel/ia32/syscall/lwp_private.c +++ /dev/null @@ -1,222 +0,0 @@ -/* - * 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 2007 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - * Copyright (c) 2018, Joyent, Inc. - */ - -#include <sys/param.h> -#include <sys/types.h> -#include <sys/disp.h> -#include <sys/sysmacros.h> -#include <sys/cpuvar.h> -#include <sys/systm.h> -#include <sys/thread.h> -#include <sys/lwp.h> -#include <sys/segments.h> -#include <sys/privregs.h> -#include <sys/cmn_err.h> - -int -lwp_setprivate(klwp_t *lwp, int which, uintptr_t base) -{ - pcb_t *pcb = &lwp->lwp_pcb; - struct regs *rp = lwptoregs(lwp); - kthread_t *t = lwptot(lwp); - int thisthread = t == curthread; - int rval; - - if (thisthread) - kpreempt_disable(); - - - /* - * 32-bit compatibility processes point to the per-cpu GDT segment - * descriptors that are virtualized to the lwp. That allows 32-bit - * programs to mess with %fs and %gs; in particular it allows - * things like this: - * - * movw %gs, %ax - * ... - * movw %ax, %gs - * - * to work, which is needed by emulators for legacy application - * environments .. - * - * 64-bit processes may also point to a per-cpu GDT segment descriptor - * virtualized to the lwp. However the descriptor base is forced - * to zero (because we can't express the full 64-bit address range - * in a long mode descriptor), so don't reload segment registers - * in a 64-bit program! 64-bit processes must have selector values - * of zero for %fs and %gs to use the 64-bit fs_base and gs_base - * respectively. - */ - if (!PCB_NEED_UPDATE_SEGS(pcb)) { - pcb->pcb_ds = rp->r_ds; - pcb->pcb_es = rp->r_es; - pcb->pcb_fs = rp->r_fs; - pcb->pcb_gs = rp->r_gs; - PCB_SET_UPDATE_SEGS(pcb); - t->t_post_sys = 1; - } - ASSERT(t->t_post_sys); - - switch (which) { - case _LWP_FSBASE: - if (lwp_getdatamodel(lwp) == DATAMODEL_NATIVE) { - set_usegd(&pcb->pcb_fsdesc, SDP_LONG, 0, 0, - SDT_MEMRWA, SEL_UPL, SDP_BYTES, SDP_OP32); - rval = pcb->pcb_fs = 0; /* null gdt descriptor */ - } else { - set_usegd(&pcb->pcb_fsdesc, SDP_SHORT, (void *)base, -1, - SDT_MEMRWA, SEL_UPL, SDP_PAGES, SDP_OP32); - rval = pcb->pcb_fs = LWPFS_SEL; - } - if (thisthread) - gdt_update_usegd(GDT_LWPFS, &pcb->pcb_fsdesc); - - pcb->pcb_fsbase = base; - break; - case _LWP_GSBASE: - if (lwp_getdatamodel(lwp) == DATAMODEL_NATIVE) { - set_usegd(&pcb->pcb_gsdesc, SDP_LONG, 0, 0, - SDT_MEMRWA, SEL_UPL, SDP_BYTES, SDP_OP32); - rval = pcb->pcb_gs = 0; /* null gdt descriptor */ - } else { - set_usegd(&pcb->pcb_gsdesc, SDP_SHORT, (void *)base, -1, - SDT_MEMRWA, SEL_UPL, SDP_PAGES, SDP_OP32); - rval = pcb->pcb_gs = LWPGS_SEL; - } - if (thisthread) - gdt_update_usegd(GDT_LWPGS, &pcb->pcb_gsdesc); - - pcb->pcb_gsbase = base; - break; - default: - rval = -1; - break; - } - - if (thisthread) - kpreempt_enable(); - return (rval); -} - -static int -lwp_getprivate(klwp_t *lwp, int which, uintptr_t base) -{ - pcb_t *pcb = &lwp->lwp_pcb; - struct regs *rp = lwptoregs(lwp); - uintptr_t sbase; - int error = 0; - - ASSERT(lwptot(lwp) == curthread); - - kpreempt_disable(); - switch (which) { - case _LWP_FSBASE: - if ((sbase = pcb->pcb_fsbase) != 0) { - if (lwp_getdatamodel(lwp) == DATAMODEL_NATIVE) { - if (PCB_NEED_UPDATE_SEGS(pcb)) { - if (pcb->pcb_fs == 0) - break; - } else { - if (rp->r_fs == 0) - break; - } - } else { - if (PCB_NEED_UPDATE_SEGS(pcb)) { - if (pcb->pcb_fs == LWPFS_SEL) - break; - } else { - if (rp->r_fs == LWPFS_SEL) - break; - } - } - } - error = EINVAL; - break; - case _LWP_GSBASE: - if ((sbase = pcb->pcb_gsbase) != 0) { - if (lwp_getdatamodel(lwp) == DATAMODEL_NATIVE) { - if (PCB_NEED_UPDATE_SEGS(pcb)) { - if (pcb->pcb_gs == 0) - break; - } else { - if (rp->r_gs == 0) - break; - } - } else { - if (PCB_NEED_UPDATE_SEGS(pcb)) { - if (pcb->pcb_gs == LWPGS_SEL) - break; - } else { - if (rp->r_gs == LWPGS_SEL) - break; - } - } - } - error = EINVAL; - break; - - - default: - error = ENOTSUP; - break; - } - kpreempt_enable(); - - if (error != 0) - return (error); - - if (lwp_getdatamodel(lwp) == DATAMODEL_NATIVE) { - if (sulword((void *)base, sbase) == -1) - error = EFAULT; -#if defined(_SYSCALL32_IMPL) - } else { - if (suword32((void *)base, (uint32_t)sbase) == -1) - error = EFAULT; -#endif - } - return (error); -} - -/* - * libc-private syscall for managing per-lwp %gs and %fs segment base values. - */ -int -syslwp_private(int cmd, int which, uintptr_t base) -{ - klwp_t *lwp = ttolwp(curthread); - int res, error; - - switch (cmd) { - case _LWP_SETPRIVATE: - res = lwp_setprivate(lwp, which, base); - return (res < 0 ? set_errno(ENOTSUP) : res); - case _LWP_GETPRIVATE: - error = lwp_getprivate(lwp, which, base); - return (error != 0 ? set_errno(error) : error); - default: - return (set_errno(ENOTSUP)); - } -} |