xref: /freebsd/sys/amd64/linux32/linux32_sysvec.c (revision 361971fbca5fdb8121dd4d05119d81269af78ea7)
1ea0fabbcSTim J. Robbins /*-
2c49761ddSPedro F. Giffuni  * SPDX-License-Identifier: BSD-3-Clause
3c49761ddSPedro F. Giffuni  *
4ea0fabbcSTim J. Robbins  * Copyright (c) 2004 Tim J. Robbins
5ea0fabbcSTim J. Robbins  * Copyright (c) 2003 Peter Wemm
6ea0fabbcSTim J. Robbins  * Copyright (c) 2002 Doug Rabson
7ea0fabbcSTim J. Robbins  * Copyright (c) 1998-1999 Andrew Gallatin
89a14aa01SUlrich Spörlein  * Copyright (c) 1994-1996 Søren Schmidt
9ea0fabbcSTim J. Robbins  * All rights reserved.
10ea0fabbcSTim J. Robbins  *
11ea0fabbcSTim J. Robbins  * Redistribution and use in source and binary forms, with or without
12ea0fabbcSTim J. Robbins  * modification, are permitted provided that the following conditions
13ea0fabbcSTim J. Robbins  * are met:
14ea0fabbcSTim J. Robbins  * 1. Redistributions of source code must retain the above copyright
15ea0fabbcSTim J. Robbins  *    notice, this list of conditions and the following disclaimer
16ea0fabbcSTim J. Robbins  *    in this position and unchanged.
17ea0fabbcSTim J. Robbins  * 2. Redistributions in binary form must reproduce the above copyright
18ea0fabbcSTim J. Robbins  *    notice, this list of conditions and the following disclaimer in the
19ea0fabbcSTim J. Robbins  *    documentation and/or other materials provided with the distribution.
20ea0fabbcSTim J. Robbins  * 3. The name of the author may not be used to endorse or promote products
21ea0fabbcSTim J. Robbins  *    derived from this software without specific prior written permission
22ea0fabbcSTim J. Robbins  *
23ea0fabbcSTim J. Robbins  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24ea0fabbcSTim J. Robbins  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25ea0fabbcSTim J. Robbins  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26ea0fabbcSTim J. Robbins  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27ea0fabbcSTim J. Robbins  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28ea0fabbcSTim J. Robbins  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29ea0fabbcSTim J. Robbins  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30ea0fabbcSTim J. Robbins  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31ea0fabbcSTim J. Robbins  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32ea0fabbcSTim J. Robbins  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33ea0fabbcSTim J. Robbins  */
34ea0fabbcSTim J. Robbins 
3502bf7e5eSTijl Coosemans #include "opt_compat.h"
3602bf7e5eSTijl Coosemans 
37ea0fabbcSTim J. Robbins #include <sys/cdefs.h>
38ea0fabbcSTim J. Robbins __FBSDID("$FreeBSD$");
39ea0fabbcSTim J. Robbins 
40841c0c7eSNathan Whitehorn #ifndef COMPAT_FREEBSD32
41841c0c7eSNathan Whitehorn #error "Unable to compile Linux-emulator due to missing COMPAT_FREEBSD32 option!"
42ea0fabbcSTim J. Robbins #endif
43ea0fabbcSTim J. Robbins 
44ea0fabbcSTim J. Robbins #define	__ELF_WORD_SIZE	32
45ea0fabbcSTim J. Robbins 
46ea0fabbcSTim J. Robbins #include <sys/param.h>
47ea0fabbcSTim J. Robbins #include <sys/systm.h>
48ea0fabbcSTim J. Robbins #include <sys/exec.h>
4948b05c3fSKonstantin Belousov #include <sys/fcntl.h>
50ea0fabbcSTim J. Robbins #include <sys/imgact.h>
51ea0fabbcSTim J. Robbins #include <sys/imgact_elf.h>
52ea0fabbcSTim J. Robbins #include <sys/kernel.h>
53ea0fabbcSTim J. Robbins #include <sys/lock.h>
54ea0fabbcSTim J. Robbins #include <sys/malloc.h>
55ea0fabbcSTim J. Robbins #include <sys/module.h>
56ea0fabbcSTim J. Robbins #include <sys/mutex.h>
57ea0fabbcSTim J. Robbins #include <sys/proc.h>
586004362eSDavid Schultz #include <sys/resourcevar.h>
599931033bSDmitry Chagin #include <sys/stddef.h>
60ea0fabbcSTim J. Robbins #include <sys/signalvar.h>
61ea0fabbcSTim J. Robbins #include <sys/syscallsubr.h>
62c0aa0e2cSEd Maste #include <sys/sysctl.h>
63ea0fabbcSTim J. Robbins #include <sys/sysent.h>
64ea0fabbcSTim J. Robbins #include <sys/sysproto.h>
65ea0fabbcSTim J. Robbins #include <sys/vnode.h>
667c09e6c0SAlexander Leidinger #include <sys/eventhandler.h>
67ea0fabbcSTim J. Robbins 
68ea0fabbcSTim J. Robbins #include <vm/vm.h>
69ea0fabbcSTim J. Robbins #include <vm/pmap.h>
70ea0fabbcSTim J. Robbins #include <vm/vm_extern.h>
71ea0fabbcSTim J. Robbins #include <vm/vm_map.h>
72ea0fabbcSTim J. Robbins #include <vm/vm_object.h>
73ea0fabbcSTim J. Robbins #include <vm/vm_page.h>
74ea0fabbcSTim J. Robbins #include <vm/vm_param.h>
75ea0fabbcSTim J. Robbins 
76ea0fabbcSTim J. Robbins #include <machine/cpu.h>
77ea0fabbcSTim J. Robbins #include <machine/md_var.h>
786004362eSDavid Schultz #include <machine/pcb.h>
79ea0fabbcSTim J. Robbins #include <machine/specialreg.h>
80d41e41f9SJohn Baldwin #include <machine/trap.h>
81ea0fabbcSTim J. Robbins 
829931033bSDmitry Chagin #include <x86/linux/linux_x86.h>
83ea0fabbcSTim J. Robbins #include <amd64/linux32/linux.h>
84ea0fabbcSTim J. Robbins #include <amd64/linux32/linux32_proto.h>
857c09e6c0SAlexander Leidinger #include <compat/linux/linux_emul.h>
860a4b664aSDmitry Chagin #include <compat/linux/linux_fork.h>
87d825ce0aSJohn Baldwin #include <compat/linux/linux_ioctl.h>
88ea0fabbcSTim J. Robbins #include <compat/linux/linux_mib.h>
894d7c2e8aSDmitry Chagin #include <compat/linux/linux_misc.h>
90ea0fabbcSTim J. Robbins #include <compat/linux/linux_signal.h>
91ea0fabbcSTim J. Robbins #include <compat/linux/linux_util.h>
92bdc37934SDmitry Chagin #include <compat/linux/linux_vdso.h>
93ea0fabbcSTim J. Robbins 
9421f24617SDmitry Chagin #include <x86/linux/linux_x86_sigframe.h>
9521f24617SDmitry Chagin 
96ea0fabbcSTim J. Robbins MODULE_VERSION(linux, 1);
97ea0fabbcSTim J. Robbins 
984aae1334SDmitry Chagin #define	LINUX32_MAXUSER		((1ul << 32) - PAGE_SIZE)
999931033bSDmitry Chagin #define	LINUX32_VDSOPAGE_SIZE	PAGE_SIZE * 2
1009931033bSDmitry Chagin #define	LINUX32_VDSOPAGE	(LINUX32_MAXUSER - LINUX32_VDSOPAGE_SIZE)
1019931033bSDmitry Chagin #define	LINUX32_SHAREDPAGE	(LINUX32_VDSOPAGE - PAGE_SIZE)
1029931033bSDmitry Chagin 				/*
1039931033bSDmitry Chagin 				 * PAGE_SIZE - the size
1049931033bSDmitry Chagin 				 * of the native SHAREDPAGE
1059931033bSDmitry Chagin 				 */
1064aae1334SDmitry Chagin #define	LINUX32_USRSTACK	LINUX32_SHAREDPAGE
1074aae1334SDmitry Chagin 
108bdc37934SDmitry Chagin static int linux_szsigcode;
1099931033bSDmitry Chagin static vm_object_t linux_vdso_obj;
1109931033bSDmitry Chagin static char *linux_vdso_mapping;
1119931033bSDmitry Chagin extern char _binary_linux32_vdso_so_o_start;
1129931033bSDmitry Chagin extern char _binary_linux32_vdso_so_o_end;
1139931033bSDmitry Chagin static vm_offset_t linux_vdso_base;
114ea0fabbcSTim J. Robbins 
1152f99bcceSJohn Baldwin extern struct sysent linux32_sysent[LINUX32_SYS_MAXSYSCALL];
116ea0fabbcSTim J. Robbins 
117ea0fabbcSTim J. Robbins SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
118ea0fabbcSTim J. Robbins 
11931174518SJohn Baldwin static int	linux_fixup_elf(uintptr_t *stack_base,
120ea0fabbcSTim J. Robbins 		    struct image_params *iparams);
12103b0d68cSJohn Baldwin static int	linux_copyout_strings(struct image_params *imgp,
12231174518SJohn Baldwin 		    uintptr_t *stack_base);
1239104847fSDavid Xu static void     linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask);
124dc858467SEd Maste static void	linux_exec_setregs(struct thread *td,
12531174518SJohn Baldwin 				   struct image_params *imgp, uintptr_t stack);
1269931033bSDmitry Chagin static void	linux_exec_sysvec_init(void *param);
1275fd9cd53SDmitry Chagin static int	linux_on_exec_vmspace(struct proc *p,
1285fd9cd53SDmitry Chagin 		    struct image_params *imgp);
12919059a13SJohn Baldwin static void	linux32_fixlimit(struct rlimit *rl, int which);
130a95659f7SEd Maste static bool	linux32_trans_osrel(const Elf_Note *note, int32_t *osrel);
131a543556cSDmitry Chagin static void	linux_vdso_install(const void *param);
132a543556cSDmitry Chagin static void	linux_vdso_deinstall(const void *param);
1339931033bSDmitry Chagin static void	linux_vdso_reloc(char *mapping, Elf_Addr offset);
134de8374dfSDmitry Chagin static void	linux32_set_fork_retval(struct thread *td);
135c26391f4SEdward Tomasz Napierala static void	linux32_set_syscall_retval(struct thread *td, int error);
136ea0fabbcSTim J. Robbins 
137ea0fabbcSTim J. Robbins struct linux32_ps_strings {
138ea0fabbcSTim J. Robbins 	u_int32_t ps_argvstr;	/* first of 0 or more argument strings */
139f2c7668eSDavid Schultz 	u_int ps_nargvstr;	/* the number of argument strings */
140ea0fabbcSTim J. Robbins 	u_int32_t ps_envstr;	/* first of 0 or more environment strings */
141f2c7668eSDavid Schultz 	u_int ps_nenvstr;	/* the number of environment strings */
142ea0fabbcSTim J. Robbins };
1434aae1334SDmitry Chagin #define	LINUX32_PS_STRINGS	(LINUX32_USRSTACK - \
1444aae1334SDmitry Chagin 				    sizeof(struct linux32_ps_strings))
145ea0fabbcSTim J. Robbins 
1469931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(__kernel_vsyscall);
1478f9635dcSDmitry Chagin LINUX_VDSO_SYM_INTPTR(linux32_vdso_sigcode);
1488f9635dcSDmitry Chagin LINUX_VDSO_SYM_INTPTR(linux32_vdso_rt_sigcode);
1499931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_timekeep_base);
1509931033bSDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_tsc_selector);
1515a6a4fb2SDmitry Chagin LINUX_VDSO_SYM_INTPTR(kern_cpu_selector);
1520020bdf1SDmitry Chagin LINUX_VDSO_SYM_CHAR(linux_platform);
153bdc37934SDmitry Chagin 
15403b0d68cSJohn Baldwin static int
155d8010b11SJohn Baldwin linux_copyout_auxargs(struct image_params *imgp, uintptr_t base)
156ea0fabbcSTim J. Robbins {
157ea0fabbcSTim J. Robbins 	Elf32_Auxargs *args;
1585f77b8a8SBrooks Davis 	Elf32_Auxinfo *argarray, *pos;
15903b0d68cSJohn Baldwin 	int error, issetugid;
1604d7c2e8aSDmitry Chagin 
161ea0fabbcSTim J. Robbins 	args = (Elf32_Auxargs *)imgp->auxargs;
1625f77b8a8SBrooks Davis 	argarray = pos = malloc(LINUX_AT_COUNT * sizeof(*pos), M_TEMP,
1635f77b8a8SBrooks Davis 	    M_WAITOK | M_ZERO);
164ea0fabbcSTim J. Robbins 
165669414e4SXin LI 	issetugid = imgp->proc->p_flag & P_SUGID ? 1 : 0;
1669931033bSDmitry Chagin 	AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO, __kernel_vsyscall);
1679931033bSDmitry Chagin 	AUXARGS_ENTRY(pos, LINUX_AT_SYSINFO_EHDR, linux_vdso_base);
1685f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, LINUX_AT_HWCAP, cpu_feature);
169ca6e1fa3SEdward Tomasz Napierala 	AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
1708d30f381SDmitry Chagin 
1718d30f381SDmitry Chagin 	/*
1728d30f381SDmitry Chagin 	 * Do not export AT_CLKTCK when emulating Linux kernel prior to 2.4.0,
1738d30f381SDmitry Chagin 	 * as it has appeared in the 2.4.0-rc7 first time.
1748d30f381SDmitry Chagin 	 * Being exported, AT_CLKTCK is returned by sysconf(_SC_CLK_TCK),
1758d30f381SDmitry Chagin 	 * glibc falls back to the hard-coded CLK_TCK value when aux entry
1768d30f381SDmitry Chagin 	 * is not present.
1778d30f381SDmitry Chagin 	 * Also see linux_times() implementation.
1788d30f381SDmitry Chagin 	 */
1798d30f381SDmitry Chagin 	if (linux_kernver(curthread) >= LINUX_KERNVER_2004000)
1805f77b8a8SBrooks Davis 		AUXARGS_ENTRY(pos, LINUX_AT_CLKTCK, stclohz);
1815f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
1825f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
1835f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
184ca6e1fa3SEdward Tomasz Napierala 	AUXARGS_ENTRY(pos, AT_BASE, args->base);
1855f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
1865f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
1875f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
1885f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
1895f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
1905f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
191ca6e1fa3SEdward Tomasz Napierala 	AUXARGS_ENTRY(pos, LINUX_AT_SECURE, issetugid);
1924048f59cSDmitry Chagin 	AUXARGS_ENTRY(pos, LINUX_AT_RANDOM, PTROUT(imgp->canary));
193ca6e1fa3SEdward Tomasz Napierala 	AUXARGS_ENTRY(pos, LINUX_AT_HWCAP2, 0);
1944048f59cSDmitry Chagin 	if (imgp->execpathp != 0)
1954048f59cSDmitry Chagin 		AUXARGS_ENTRY(pos, LINUX_AT_EXECFN, PTROUT(imgp->execpathp));
1964d7c2e8aSDmitry Chagin 	if (args->execfd != -1)
1975f77b8a8SBrooks Davis 		AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
198ca6e1fa3SEdward Tomasz Napierala 	AUXARGS_ENTRY(pos, LINUX_AT_PLATFORM, PTROUT(linux_platform));
1995f77b8a8SBrooks Davis 	AUXARGS_ENTRY(pos, AT_NULL, 0);
200ea0fabbcSTim J. Robbins 
201ea0fabbcSTim J. Robbins 	free(imgp->auxargs, M_TEMP);
202ea0fabbcSTim J. Robbins 	imgp->auxargs = NULL;
2036362b1a6SJung-uk Kim 	KASSERT(pos - argarray <= LINUX_AT_COUNT, ("Too many auxargs"));
2045f77b8a8SBrooks Davis 
205d8010b11SJohn Baldwin 	error = copyout(argarray, (void *)base,
206d8010b11SJohn Baldwin 	    sizeof(*argarray) * LINUX_AT_COUNT);
2075f77b8a8SBrooks Davis 	free(argarray, M_TEMP);
20803b0d68cSJohn Baldwin 	return (error);
2095caa67faSJohn Baldwin }
210ea0fabbcSTim J. Robbins 
2115caa67faSJohn Baldwin static int
21231174518SJohn Baldwin linux_fixup_elf(uintptr_t *stack_base, struct image_params *imgp)
2135caa67faSJohn Baldwin {
2145caa67faSJohn Baldwin 	Elf32_Addr *base;
2155caa67faSJohn Baldwin 
2165caa67faSJohn Baldwin 	base = (Elf32_Addr *)*stack_base;
217ea0fabbcSTim J. Robbins 	base--;
2185f77b8a8SBrooks Davis 	if (suword32(base, (uint32_t)imgp->args->argc) == -1)
2195f77b8a8SBrooks Davis 		return (EFAULT);
22031174518SJohn Baldwin 	*stack_base = (uintptr_t)base;
221af682d48SDmitry Chagin 	return (0);
222ea0fabbcSTim J. Robbins }
223ea0fabbcSTim J. Robbins 
224ea0fabbcSTim J. Robbins static void
2259104847fSDavid Xu linux_rt_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
226ea0fabbcSTim J. Robbins {
227ea0fabbcSTim J. Robbins 	struct thread *td = curthread;
228ea0fabbcSTim J. Robbins 	struct proc *p = td->td_proc;
229ea0fabbcSTim J. Robbins 	struct sigacts *psp;
230ea0fabbcSTim J. Robbins 	struct trapframe *regs;
231ea0fabbcSTim J. Robbins 	struct l_rt_sigframe *fp, frame;
232ea0fabbcSTim J. Robbins 	int oonstack;
2339104847fSDavid Xu 	int sig;
2349104847fSDavid Xu 	int code;
235ea0fabbcSTim J. Robbins 
236eca368ecSDmitry Chagin 	sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
2379104847fSDavid Xu 	code = ksi->ksi_code;
238ea0fabbcSTim J. Robbins 	PROC_LOCK_ASSERT(p, MA_OWNED);
239ea0fabbcSTim J. Robbins 	psp = p->p_sigacts;
240ea0fabbcSTim J. Robbins 	mtx_assert(&psp->ps_mtx, MA_OWNED);
241ea0fabbcSTim J. Robbins 	regs = td->td_frame;
242ea0fabbcSTim J. Robbins 	oonstack = sigonstack(regs->tf_rsp);
243ea0fabbcSTim J. Robbins 
2444ba25759SEd Maste 	/* Allocate space for the signal handler context. */
245ea0fabbcSTim J. Robbins 	if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
246ea0fabbcSTim J. Robbins 	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
247aa949be5SJohn Baldwin 		fp = (struct l_rt_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
248ea0fabbcSTim J. Robbins 		    td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
249ea0fabbcSTim J. Robbins 	} else
250ea0fabbcSTim J. Robbins 		fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
251ea0fabbcSTim J. Robbins 	mtx_unlock(&psp->ps_mtx);
252ea0fabbcSTim J. Robbins 
2534ba25759SEd Maste 	/* Build the argument list for the signal handler. */
2544ab7403bSDmitry Chagin 	sig = bsd_to_linux_signal(sig);
255ea0fabbcSTim J. Robbins 
256ea0fabbcSTim J. Robbins 	bzero(&frame, sizeof(frame));
257ea0fabbcSTim J. Robbins 
258ea0fabbcSTim J. Robbins 	frame.sf_sig = sig;
259ea0fabbcSTim J. Robbins 	frame.sf_siginfo = PTROUT(&fp->sf_si);
2606e826d27SDmitry Chagin 	frame.sf_ucontext = PTROUT(&fp->sf_uc);
261ea0fabbcSTim J. Robbins 
2624ba25759SEd Maste 	/* Fill in POSIX parts. */
263f4e80108SDmitry Chagin 	siginfo_to_lsiginfo(&ksi->ksi_info, &frame.sf_si, sig);
264ea0fabbcSTim J. Robbins 
265ea0fabbcSTim J. Robbins 	/*
2664ba25759SEd Maste 	 * Build the signal context to be used by sigreturn and libgcc unwind.
267ea0fabbcSTim J. Robbins 	 */
2686e826d27SDmitry Chagin 	frame.sf_uc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
2696e826d27SDmitry Chagin 	frame.sf_uc.uc_stack.ss_size = td->td_sigstk.ss_size;
2706e826d27SDmitry Chagin 	frame.sf_uc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
271ea0fabbcSTim J. Robbins 	    ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
272ea0fabbcSTim J. Robbins 	PROC_UNLOCK(p);
273ea0fabbcSTim J. Robbins 
2746e826d27SDmitry Chagin 	bsd_to_linux_sigset(mask, &frame.sf_uc.uc_sigmask);
275ea0fabbcSTim J. Robbins 
2766e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_mask   = frame.sf_uc.uc_sigmask.__mask;
2776e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_edi    = regs->tf_rdi;
2786e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_esi    = regs->tf_rsi;
2796e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_ebp    = regs->tf_rbp;
2806e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_ebx    = regs->tf_rbx;
2816e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_esp    = regs->tf_rsp;
2826e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_edx    = regs->tf_rdx;
2836e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_ecx    = regs->tf_rcx;
2846e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_eax    = regs->tf_rax;
2856e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_eip    = regs->tf_rip;
2866e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_cs     = regs->tf_cs;
2876e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_gs     = regs->tf_gs;
2886e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_fs     = regs->tf_fs;
2896e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_es     = regs->tf_es;
2906e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_ds     = regs->tf_ds;
2916e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_eflags = regs->tf_rflags;
2926e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
2936e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_ss     = regs->tf_ss;
2946e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_err    = regs->tf_err;
2956e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_cr2    = (u_int32_t)(uintptr_t)ksi->ksi_addr;
2966e826d27SDmitry Chagin 	frame.sf_uc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
297ea0fabbcSTim J. Robbins 
298ea0fabbcSTim J. Robbins 	if (copyout(&frame, fp, sizeof(frame)) != 0) {
299ea0fabbcSTim J. Robbins 		/*
300ea0fabbcSTim J. Robbins 		 * Process has trashed its stack; give it an illegal
301ea0fabbcSTim J. Robbins 		 * instruction to halt it in its tracks.
302ea0fabbcSTim J. Robbins 		 */
303ea0fabbcSTim J. Robbins 		PROC_LOCK(p);
304ea0fabbcSTim J. Robbins 		sigexit(td, SIGILL);
305ea0fabbcSTim J. Robbins 	}
306ea0fabbcSTim J. Robbins 
3074ba25759SEd Maste 	/* Build context to run handler in. */
308ea0fabbcSTim J. Robbins 	regs->tf_rsp = PTROUT(fp);
3098f9635dcSDmitry Chagin 	regs->tf_rip = linux32_vdso_rt_sigcode;
310ba279bcdSDmitry Chagin 	regs->tf_rdi = PTROUT(catcher);
31122eca0bfSKonstantin Belousov 	regs->tf_rflags &= ~(PSL_T | PSL_D);
312ea0fabbcSTim J. Robbins 	regs->tf_cs = _ucode32sel;
313ea0fabbcSTim J. Robbins 	regs->tf_ss = _udatasel;
3142c66cccaSKonstantin Belousov 	regs->tf_ds = _udatasel;
3152c66cccaSKonstantin Belousov 	regs->tf_es = _udatasel;
3162c66cccaSKonstantin Belousov 	regs->tf_fs = _ufssel;
3172c66cccaSKonstantin Belousov 	regs->tf_gs = _ugssel;
3182c66cccaSKonstantin Belousov 	regs->tf_flags = TF_HASSEGS;
319e6c006d9SJung-uk Kim 	set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
320ea0fabbcSTim J. Robbins 	PROC_LOCK(p);
321ea0fabbcSTim J. Robbins 	mtx_lock(&psp->ps_mtx);
322ea0fabbcSTim J. Robbins }
323ea0fabbcSTim J. Robbins 
324ea0fabbcSTim J. Robbins /*
325ea0fabbcSTim J. Robbins  * Send an interrupt to process.
326ea0fabbcSTim J. Robbins  *
327ea0fabbcSTim J. Robbins  * Stack is set up to allow sigcode stored
328ea0fabbcSTim J. Robbins  * in u. to call routine, followed by kcall
329ea0fabbcSTim J. Robbins  * to sigreturn routine below.  After sigreturn
330ea0fabbcSTim J. Robbins  * resets the signal mask, the stack, and the
331ea0fabbcSTim J. Robbins  * frame pointer, it returns to the user
332ea0fabbcSTim J. Robbins  * specified pc, psl.
333ea0fabbcSTim J. Robbins  */
334ea0fabbcSTim J. Robbins static void
3359104847fSDavid Xu linux_sendsig(sig_t catcher, ksiginfo_t *ksi, sigset_t *mask)
336ea0fabbcSTim J. Robbins {
337ea0fabbcSTim J. Robbins 	struct thread *td = curthread;
338ea0fabbcSTim J. Robbins 	struct proc *p = td->td_proc;
339ea0fabbcSTim J. Robbins 	struct sigacts *psp;
340ea0fabbcSTim J. Robbins 	struct trapframe *regs;
341ea0fabbcSTim J. Robbins 	struct l_sigframe *fp, frame;
342ea0fabbcSTim J. Robbins 	l_sigset_t lmask;
3434ab7403bSDmitry Chagin 	int oonstack;
3449104847fSDavid Xu 	int sig, code;
345ea0fabbcSTim J. Robbins 
346eca368ecSDmitry Chagin 	sig = linux_translate_traps(ksi->ksi_signo, ksi->ksi_trapno);
3479104847fSDavid Xu 	code = ksi->ksi_code;
348ea0fabbcSTim J. Robbins 	PROC_LOCK_ASSERT(p, MA_OWNED);
349ea0fabbcSTim J. Robbins 	psp = p->p_sigacts;
350ea0fabbcSTim J. Robbins 	mtx_assert(&psp->ps_mtx, MA_OWNED);
351ea0fabbcSTim J. Robbins 	if (SIGISMEMBER(psp->ps_siginfo, sig)) {
352ea0fabbcSTim J. Robbins 		/* Signal handler installed with SA_SIGINFO. */
3539104847fSDavid Xu 		linux_rt_sendsig(catcher, ksi, mask);
354ea0fabbcSTim J. Robbins 		return;
355ea0fabbcSTim J. Robbins 	}
356ea0fabbcSTim J. Robbins 
357ea0fabbcSTim J. Robbins 	regs = td->td_frame;
358ea0fabbcSTim J. Robbins 	oonstack = sigonstack(regs->tf_rsp);
359ea0fabbcSTim J. Robbins 
3604ba25759SEd Maste 	/* Allocate space for the signal handler context. */
361ea0fabbcSTim J. Robbins 	if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
362ea0fabbcSTim J. Robbins 	    SIGISMEMBER(psp->ps_sigonstack, sig)) {
363aa949be5SJohn Baldwin 		fp = (struct l_sigframe *)((uintptr_t)td->td_sigstk.ss_sp +
364ea0fabbcSTim J. Robbins 		    td->td_sigstk.ss_size - sizeof(struct l_sigframe));
365ea0fabbcSTim J. Robbins 	} else
366ea0fabbcSTim J. Robbins 		fp = (struct l_sigframe *)regs->tf_rsp - 1;
367ea0fabbcSTim J. Robbins 	mtx_unlock(&psp->ps_mtx);
368ea0fabbcSTim J. Robbins 	PROC_UNLOCK(p);
369ea0fabbcSTim J. Robbins 
3704ba25759SEd Maste 	/* Build the argument list for the signal handler. */
3714ab7403bSDmitry Chagin 	sig = bsd_to_linux_signal(sig);
372ea0fabbcSTim J. Robbins 
373ea0fabbcSTim J. Robbins 	bzero(&frame, sizeof(frame));
374ea0fabbcSTim J. Robbins 
375ea0fabbcSTim J. Robbins 	frame.sf_sig = sig;
3764a6c2d07SDmitry Chagin 	frame.sf_sigmask = *mask;
377ea0fabbcSTim J. Robbins 	bsd_to_linux_sigset(mask, &lmask);
378ea0fabbcSTim J. Robbins 
3794ba25759SEd Maste 	/* Build the signal context to be used by sigreturn. */
3804ab7403bSDmitry Chagin 	frame.sf_sc.sc_mask   = lmask.__mask;
3812c66cccaSKonstantin Belousov 	frame.sf_sc.sc_gs     = regs->tf_gs;
3822c66cccaSKonstantin Belousov 	frame.sf_sc.sc_fs     = regs->tf_fs;
3832c66cccaSKonstantin Belousov 	frame.sf_sc.sc_es     = regs->tf_es;
3842c66cccaSKonstantin Belousov 	frame.sf_sc.sc_ds     = regs->tf_ds;
385ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_edi    = regs->tf_rdi;
386ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_esi    = regs->tf_rsi;
387ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_ebp    = regs->tf_rbp;
388ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_ebx    = regs->tf_rbx;
389bdc37934SDmitry Chagin 	frame.sf_sc.sc_esp    = regs->tf_rsp;
390ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_edx    = regs->tf_rdx;
391ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_ecx    = regs->tf_rcx;
392ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_eax    = regs->tf_rax;
393ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_eip    = regs->tf_rip;
394ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_cs     = regs->tf_cs;
395ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_eflags = regs->tf_rflags;
396ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
397ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_ss     = regs->tf_ss;
398ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_err    = regs->tf_err;
39996a2b635SKonstantin Belousov 	frame.sf_sc.sc_cr2    = (u_int32_t)(uintptr_t)ksi->ksi_addr;
400ea0fabbcSTim J. Robbins 	frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
401ea0fabbcSTim J. Robbins 
402ea0fabbcSTim J. Robbins 	if (copyout(&frame, fp, sizeof(frame)) != 0) {
403ea0fabbcSTim J. Robbins 		/*
404ea0fabbcSTim J. Robbins 		 * Process has trashed its stack; give it an illegal
405ea0fabbcSTim J. Robbins 		 * instruction to halt it in its tracks.
406ea0fabbcSTim J. Robbins 		 */
407ea0fabbcSTim J. Robbins 		PROC_LOCK(p);
408ea0fabbcSTim J. Robbins 		sigexit(td, SIGILL);
409ea0fabbcSTim J. Robbins 	}
410ea0fabbcSTim J. Robbins 
4114ba25759SEd Maste 	/* Build context to run handler in. */
412ea0fabbcSTim J. Robbins 	regs->tf_rsp = PTROUT(fp);
4138f9635dcSDmitry Chagin 	regs->tf_rip = linux32_vdso_sigcode;
414ba279bcdSDmitry Chagin 	regs->tf_rdi = PTROUT(catcher);
41522eca0bfSKonstantin Belousov 	regs->tf_rflags &= ~(PSL_T | PSL_D);
416ea0fabbcSTim J. Robbins 	regs->tf_cs = _ucode32sel;
417ea0fabbcSTim J. Robbins 	regs->tf_ss = _udatasel;
4182c66cccaSKonstantin Belousov 	regs->tf_ds = _udatasel;
4192c66cccaSKonstantin Belousov 	regs->tf_es = _udatasel;
4202c66cccaSKonstantin Belousov 	regs->tf_fs = _ufssel;
4212c66cccaSKonstantin Belousov 	regs->tf_gs = _ugssel;
4222c66cccaSKonstantin Belousov 	regs->tf_flags = TF_HASSEGS;
423e6c006d9SJung-uk Kim 	set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
424ea0fabbcSTim J. Robbins 	PROC_LOCK(p);
425ea0fabbcSTim J. Robbins 	mtx_lock(&psp->ps_mtx);
426ea0fabbcSTim J. Robbins }
427ea0fabbcSTim J. Robbins 
428ea0fabbcSTim J. Robbins /*
429ea0fabbcSTim J. Robbins  * System call to cleanup state after a signal
430ea0fabbcSTim J. Robbins  * has been taken.  Reset signal mask and
431ea0fabbcSTim J. Robbins  * stack state from context left by sendsig (above).
432ea0fabbcSTim J. Robbins  * Return to previous pc and psl as specified by
433ea0fabbcSTim J. Robbins  * context left by sendsig. Check carefully to
434ea0fabbcSTim J. Robbins  * make sure that the user has not modified the
435ea0fabbcSTim J. Robbins  * psl to gain improper privileges or to cause
436ea0fabbcSTim J. Robbins  * a machine fault.
437ea0fabbcSTim J. Robbins  */
438ea0fabbcSTim J. Robbins int
439ea0fabbcSTim J. Robbins linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
440ea0fabbcSTim J. Robbins {
441ea0fabbcSTim J. Robbins 	struct l_sigframe frame;
442ea0fabbcSTim J. Robbins 	struct trapframe *regs;
4434ab7403bSDmitry Chagin 	int eflags;
4449104847fSDavid Xu 	ksiginfo_t ksi;
445ea0fabbcSTim J. Robbins 
446ea0fabbcSTim J. Robbins 	regs = td->td_frame;
447ea0fabbcSTim J. Robbins 
448ea0fabbcSTim J. Robbins 	/*
449ea0fabbcSTim J. Robbins 	 * The trampoline code hands us the sigframe.
450ea0fabbcSTim J. Robbins 	 * It is unsafe to keep track of it ourselves, in the event that a
451ea0fabbcSTim J. Robbins 	 * program jumps out of a signal handler.
452ea0fabbcSTim J. Robbins 	 */
453ea0fabbcSTim J. Robbins 	if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
454ea0fabbcSTim J. Robbins 		return (EFAULT);
455ea0fabbcSTim J. Robbins 
4564ba25759SEd Maste 	/* Check for security violations. */
457ea0fabbcSTim J. Robbins 	eflags = frame.sf_sc.sc_eflags;
458a42d362bSKonstantin Belousov 	if (!EFL_SECURE(eflags, regs->tf_rflags))
459ea0fabbcSTim J. Robbins 		return(EINVAL);
460ea0fabbcSTim J. Robbins 
461ea0fabbcSTim J. Robbins 	/*
462ea0fabbcSTim J. Robbins 	 * Don't allow users to load a valid privileged %cs.  Let the
463ea0fabbcSTim J. Robbins 	 * hardware check for invalid selectors, excess privilege in
464ea0fabbcSTim J. Robbins 	 * other selectors, invalid %eip's and invalid %esp's.
465ea0fabbcSTim J. Robbins 	 */
466ea0fabbcSTim J. Robbins 	if (!CS_SECURE(frame.sf_sc.sc_cs)) {
4679104847fSDavid Xu 		ksiginfo_init_trap(&ksi);
4689104847fSDavid Xu 		ksi.ksi_signo = SIGBUS;
4699104847fSDavid Xu 		ksi.ksi_code = BUS_OBJERR;
4709104847fSDavid Xu 		ksi.ksi_trapno = T_PROTFLT;
4719104847fSDavid Xu 		ksi.ksi_addr = (void *)regs->tf_rip;
4729104847fSDavid Xu 		trapsignal(td, &ksi);
473ea0fabbcSTim J. Robbins 		return(EINVAL);
474ea0fabbcSTim J. Robbins 	}
475ea0fabbcSTim J. Robbins 
4764a6c2d07SDmitry Chagin 	kern_sigprocmask(td, SIG_SETMASK, &frame.sf_sigmask, NULL, 0);
477ea0fabbcSTim J. Robbins 
4784ba25759SEd Maste 	/* Restore signal context. */
479ea0fabbcSTim J. Robbins 	regs->tf_rdi    = frame.sf_sc.sc_edi;
480ea0fabbcSTim J. Robbins 	regs->tf_rsi    = frame.sf_sc.sc_esi;
481ea0fabbcSTim J. Robbins 	regs->tf_rbp    = frame.sf_sc.sc_ebp;
482ea0fabbcSTim J. Robbins 	regs->tf_rbx    = frame.sf_sc.sc_ebx;
483ea0fabbcSTim J. Robbins 	regs->tf_rdx    = frame.sf_sc.sc_edx;
484ea0fabbcSTim J. Robbins 	regs->tf_rcx    = frame.sf_sc.sc_ecx;
485ea0fabbcSTim J. Robbins 	regs->tf_rax    = frame.sf_sc.sc_eax;
486ea0fabbcSTim J. Robbins 	regs->tf_rip    = frame.sf_sc.sc_eip;
487ea0fabbcSTim J. Robbins 	regs->tf_cs     = frame.sf_sc.sc_cs;
4882c66cccaSKonstantin Belousov 	regs->tf_ds     = frame.sf_sc.sc_ds;
4892c66cccaSKonstantin Belousov 	regs->tf_es     = frame.sf_sc.sc_es;
4902c66cccaSKonstantin Belousov 	regs->tf_fs     = frame.sf_sc.sc_fs;
4912c66cccaSKonstantin Belousov 	regs->tf_gs     = frame.sf_sc.sc_gs;
492ea0fabbcSTim J. Robbins 	regs->tf_rflags = eflags;
493ea0fabbcSTim J. Robbins 	regs->tf_rsp    = frame.sf_sc.sc_esp_at_signal;
494ea0fabbcSTim J. Robbins 	regs->tf_ss     = frame.sf_sc.sc_ss;
495e6c006d9SJung-uk Kim 	set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
496ea0fabbcSTim J. Robbins 
497ea0fabbcSTim J. Robbins 	return (EJUSTRETURN);
498ea0fabbcSTim J. Robbins }
499ea0fabbcSTim J. Robbins 
500ea0fabbcSTim J. Robbins /*
501ea0fabbcSTim J. Robbins  * System call to cleanup state after a signal
502ea0fabbcSTim J. Robbins  * has been taken.  Reset signal mask and
503ea0fabbcSTim J. Robbins  * stack state from context left by rt_sendsig (above).
504ea0fabbcSTim J. Robbins  * Return to previous pc and psl as specified by
505ea0fabbcSTim J. Robbins  * context left by sendsig. Check carefully to
506ea0fabbcSTim J. Robbins  * make sure that the user has not modified the
507ea0fabbcSTim J. Robbins  * psl to gain improper privileges or to cause
508ea0fabbcSTim J. Robbins  * a machine fault.
509ea0fabbcSTim J. Robbins  */
510ea0fabbcSTim J. Robbins int
511ea0fabbcSTim J. Robbins linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
512ea0fabbcSTim J. Robbins {
513ea0fabbcSTim J. Robbins 	struct l_ucontext uc;
514ea0fabbcSTim J. Robbins 	struct l_sigcontext *context;
515d6e029adSKonstantin Belousov 	sigset_t bmask;
516ea0fabbcSTim J. Robbins 	l_stack_t *lss;
517ea0fabbcSTim J. Robbins 	stack_t ss;
518ea0fabbcSTim J. Robbins 	struct trapframe *regs;
519ea0fabbcSTim J. Robbins 	int eflags;
5209104847fSDavid Xu 	ksiginfo_t ksi;
521ea0fabbcSTim J. Robbins 
522ea0fabbcSTim J. Robbins 	regs = td->td_frame;
523ea0fabbcSTim J. Robbins 
524ea0fabbcSTim J. Robbins 	/*
525ea0fabbcSTim J. Robbins 	 * The trampoline code hands us the ucontext.
526ea0fabbcSTim J. Robbins 	 * It is unsafe to keep track of it ourselves, in the event that a
527ea0fabbcSTim J. Robbins 	 * program jumps out of a signal handler.
528ea0fabbcSTim J. Robbins 	 */
529ea0fabbcSTim J. Robbins 	if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
530ea0fabbcSTim J. Robbins 		return (EFAULT);
531ea0fabbcSTim J. Robbins 
532ea0fabbcSTim J. Robbins 	context = &uc.uc_mcontext;
533ea0fabbcSTim J. Robbins 
5344ba25759SEd Maste 	/* Check for security violations. */
535ea0fabbcSTim J. Robbins 	eflags = context->sc_eflags;
536a42d362bSKonstantin Belousov 	if (!EFL_SECURE(eflags, regs->tf_rflags))
537ea0fabbcSTim J. Robbins 		return(EINVAL);
538ea0fabbcSTim J. Robbins 
539ea0fabbcSTim J. Robbins 	/*
540ea0fabbcSTim J. Robbins 	 * Don't allow users to load a valid privileged %cs.  Let the
541ea0fabbcSTim J. Robbins 	 * hardware check for invalid selectors, excess privilege in
542ea0fabbcSTim J. Robbins 	 * other selectors, invalid %eip's and invalid %esp's.
543ea0fabbcSTim J. Robbins 	 */
544ea0fabbcSTim J. Robbins 	if (!CS_SECURE(context->sc_cs)) {
5459104847fSDavid Xu 		ksiginfo_init_trap(&ksi);
5469104847fSDavid Xu 		ksi.ksi_signo = SIGBUS;
5479104847fSDavid Xu 		ksi.ksi_code = BUS_OBJERR;
5489104847fSDavid Xu 		ksi.ksi_trapno = T_PROTFLT;
5499104847fSDavid Xu 		ksi.ksi_addr = (void *)regs->tf_rip;
5509104847fSDavid Xu 		trapsignal(td, &ksi);
551ea0fabbcSTim J. Robbins 		return(EINVAL);
552ea0fabbcSTim J. Robbins 	}
553ea0fabbcSTim J. Robbins 
554d6e029adSKonstantin Belousov 	linux_to_bsd_sigset(&uc.uc_sigmask, &bmask);
555d6e029adSKonstantin Belousov 	kern_sigprocmask(td, SIG_SETMASK, &bmask, NULL, 0);
556ea0fabbcSTim J. Robbins 
557ea0fabbcSTim J. Robbins 	/*
558ea0fabbcSTim J. Robbins 	 * Restore signal context
559ea0fabbcSTim J. Robbins 	 */
5602c66cccaSKonstantin Belousov 	regs->tf_gs	= context->sc_gs;
5612c66cccaSKonstantin Belousov 	regs->tf_fs	= context->sc_fs;
5622c66cccaSKonstantin Belousov 	regs->tf_es	= context->sc_es;
5632c66cccaSKonstantin Belousov 	regs->tf_ds	= context->sc_ds;
564ea0fabbcSTim J. Robbins 	regs->tf_rdi    = context->sc_edi;
565ea0fabbcSTim J. Robbins 	regs->tf_rsi    = context->sc_esi;
566ea0fabbcSTim J. Robbins 	regs->tf_rbp    = context->sc_ebp;
567ea0fabbcSTim J. Robbins 	regs->tf_rbx    = context->sc_ebx;
568ea0fabbcSTim J. Robbins 	regs->tf_rdx    = context->sc_edx;
569ea0fabbcSTim J. Robbins 	regs->tf_rcx    = context->sc_ecx;
570ea0fabbcSTim J. Robbins 	regs->tf_rax    = context->sc_eax;
571ea0fabbcSTim J. Robbins 	regs->tf_rip    = context->sc_eip;
572ea0fabbcSTim J. Robbins 	regs->tf_cs     = context->sc_cs;
573ea0fabbcSTim J. Robbins 	regs->tf_rflags = eflags;
574ea0fabbcSTim J. Robbins 	regs->tf_rsp    = context->sc_esp_at_signal;
575ea0fabbcSTim J. Robbins 	regs->tf_ss     = context->sc_ss;
576e6c006d9SJung-uk Kim 	set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
577ea0fabbcSTim J. Robbins 
578ea0fabbcSTim J. Robbins 	/*
579ea0fabbcSTim J. Robbins 	 * call sigaltstack & ignore results..
580ea0fabbcSTim J. Robbins 	 */
581ea0fabbcSTim J. Robbins 	lss = &uc.uc_stack;
582ea0fabbcSTim J. Robbins 	ss.ss_sp = PTRIN(lss->ss_sp);
583ea0fabbcSTim J. Robbins 	ss.ss_size = lss->ss_size;
584ea0fabbcSTim J. Robbins 	ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
585ea0fabbcSTim J. Robbins 
586ea0fabbcSTim J. Robbins 	(void)kern_sigaltstack(td, &ss, NULL);
587ea0fabbcSTim J. Robbins 
588ea0fabbcSTim J. Robbins 	return (EJUSTRETURN);
589ea0fabbcSTim J. Robbins }
590ea0fabbcSTim J. Robbins 
591afe1a688SKonstantin Belousov static int
5922d88da2fSKonstantin Belousov linux32_fetch_syscall_args(struct thread *td)
593ea0fabbcSTim J. Robbins {
594afe1a688SKonstantin Belousov 	struct proc *p;
595afe1a688SKonstantin Belousov 	struct trapframe *frame;
5962d88da2fSKonstantin Belousov 	struct syscall_args *sa;
597afe1a688SKonstantin Belousov 
598afe1a688SKonstantin Belousov 	p = td->td_proc;
599afe1a688SKonstantin Belousov 	frame = td->td_frame;
6002d88da2fSKonstantin Belousov 	sa = &td->td_sa;
601afe1a688SKonstantin Belousov 
602afe1a688SKonstantin Belousov 	sa->args[0] = frame->tf_rbx;
603afe1a688SKonstantin Belousov 	sa->args[1] = frame->tf_rcx;
604afe1a688SKonstantin Belousov 	sa->args[2] = frame->tf_rdx;
605afe1a688SKonstantin Belousov 	sa->args[3] = frame->tf_rsi;
606afe1a688SKonstantin Belousov 	sa->args[4] = frame->tf_rdi;
607afe1a688SKonstantin Belousov 	sa->args[5] = frame->tf_rbp;	/* Unconfirmed */
608afe1a688SKonstantin Belousov 	sa->code = frame->tf_rax;
609cf98bc28SDavid Chisnall 	sa->original_code = sa->code;
610afe1a688SKonstantin Belousov 
611afe1a688SKonstantin Belousov 	if (sa->code >= p->p_sysent->sv_size)
612fcdffc03SDmitry Chagin 		/* nosys */
6135047105bSJohn Baldwin 		sa->callp = &p->p_sysent->sv_table[p->p_sysent->sv_size - 1];
614afe1a688SKonstantin Belousov 	else
615afe1a688SKonstantin Belousov 		sa->callp = &p->p_sysent->sv_table[sa->code];
616afe1a688SKonstantin Belousov 
617afe1a688SKonstantin Belousov 	td->td_retval[0] = 0;
618afe1a688SKonstantin Belousov 	td->td_retval[1] = frame->tf_rdx;
619afe1a688SKonstantin Belousov 
620afe1a688SKonstantin Belousov 	return (0);
621ea0fabbcSTim J. Robbins }
622ea0fabbcSTim J. Robbins 
623c26391f4SEdward Tomasz Napierala static void
624c26391f4SEdward Tomasz Napierala linux32_set_syscall_retval(struct thread *td, int error)
625c26391f4SEdward Tomasz Napierala {
626c26391f4SEdward Tomasz Napierala 	struct trapframe *frame = td->td_frame;
627c26391f4SEdward Tomasz Napierala 
628c26391f4SEdward Tomasz Napierala 	cpu_set_syscall_retval(td, error);
629c26391f4SEdward Tomasz Napierala 
630c26391f4SEdward Tomasz Napierala 	if (__predict_false(error != 0)) {
631c26391f4SEdward Tomasz Napierala 		if (error != ERESTART && error != EJUSTRETURN)
632866b1f51SEdward Tomasz Napierala 			frame->tf_rax = bsd_to_linux_errno(error);
633c26391f4SEdward Tomasz Napierala 	}
634c26391f4SEdward Tomasz Napierala }
635c26391f4SEdward Tomasz Napierala 
636de8374dfSDmitry Chagin static void
637de8374dfSDmitry Chagin linux32_set_fork_retval(struct thread *td)
638de8374dfSDmitry Chagin {
639de8374dfSDmitry Chagin 	struct trapframe *frame = td->td_frame;
640de8374dfSDmitry Chagin 
641de8374dfSDmitry Chagin 	frame->tf_rax = 0;
642de8374dfSDmitry Chagin }
643de8374dfSDmitry Chagin 
644ea0fabbcSTim J. Robbins /*
645ea0fabbcSTim J. Robbins  * Clear registers on exec
646ea0fabbcSTim J. Robbins  * XXX copied from ia32_signal.c.
647ea0fabbcSTim J. Robbins  */
648ea0fabbcSTim J. Robbins static void
64931174518SJohn Baldwin linux_exec_setregs(struct thread *td, struct image_params *imgp,
65031174518SJohn Baldwin     uintptr_t stack)
651ea0fabbcSTim J. Robbins {
652ea0fabbcSTim J. Robbins 	struct trapframe *regs = td->td_frame;
653ea0fabbcSTim J. Robbins 	struct pcb *pcb = td->td_pcb;
6547c5d1690SKonstantin Belousov 	register_t saved_rflags;
6557c5d1690SKonstantin Belousov 
6567c5d1690SKonstantin Belousov 	regs = td->td_frame;
6577c5d1690SKonstantin Belousov 	pcb = td->td_pcb;
658ea0fabbcSTim J. Robbins 
6592c66cccaSKonstantin Belousov 	if (td->td_proc->p_md.md_ldt != NULL)
6602c66cccaSKonstantin Belousov 		user_ldt_free(td);
6612c66cccaSKonstantin Belousov 
6629c5b213eSJung-uk Kim 	critical_enter();
663ea0fabbcSTim J. Robbins 	wrmsr(MSR_FSBASE, 0);
664ea0fabbcSTim J. Robbins 	wrmsr(MSR_KGSBASE, 0);	/* User value while we're in the kernel */
665ea0fabbcSTim J. Robbins 	pcb->pcb_fsbase = 0;
666ea0fabbcSTim J. Robbins 	pcb->pcb_gsbase = 0;
6679c5b213eSJung-uk Kim 	critical_exit();
6682ee8325fSJohn Baldwin 	pcb->pcb_initial_fpucw = __LINUX_NPXCW__;
669ea0fabbcSTim J. Robbins 
6707c5d1690SKonstantin Belousov 	saved_rflags = regs->tf_rflags & PSL_T;
671ea0fabbcSTim J. Robbins 	bzero((char *)regs, sizeof(struct trapframe));
672a107d8aaSNathan Whitehorn 	regs->tf_rip = imgp->entry_addr;
673ea0fabbcSTim J. Robbins 	regs->tf_rsp = stack;
6747c5d1690SKonstantin Belousov 	regs->tf_rflags = PSL_USER | saved_rflags;
6752c66cccaSKonstantin Belousov 	regs->tf_gs = _ugssel;
6762c66cccaSKonstantin Belousov 	regs->tf_fs = _ufssel;
6772c66cccaSKonstantin Belousov 	regs->tf_es = _udatasel;
6782c66cccaSKonstantin Belousov 	regs->tf_ds = _udatasel;
679ea0fabbcSTim J. Robbins 	regs->tf_ss = _udatasel;
6802c66cccaSKonstantin Belousov 	regs->tf_flags = TF_HASSEGS;
681ea0fabbcSTim J. Robbins 	regs->tf_cs = _ucode32sel;
682397df744SBrooks Davis 	regs->tf_rbx = (register_t)imgp->ps_strings;
683bdbf2db5SJung-uk Kim 
68494172affSKonstantin Belousov 	x86_clear_dbregs(pcb);
68594172affSKonstantin Belousov 
6862a988f7cSStephan Uphoff 	fpstate_drop(td);
687ea0fabbcSTim J. Robbins 
6881b3c3256SKonstantin Belousov 	/* Do full restore on return so that we can change to a different %cs */
689e6c006d9SJung-uk Kim 	set_pcb_flags(pcb, PCB_32BIT | PCB_FULL_IRET);
690ea0fabbcSTim J. Robbins }
691ea0fabbcSTim J. Robbins 
692ea0fabbcSTim J. Robbins /*
693ea0fabbcSTim J. Robbins  * XXX copied from ia32_sysvec.c.
694ea0fabbcSTim J. Robbins  */
69503b0d68cSJohn Baldwin static int
69631174518SJohn Baldwin linux_copyout_strings(struct image_params *imgp, uintptr_t *stack_base)
697ea0fabbcSTim J. Robbins {
69803b0d68cSJohn Baldwin 	int argc, envc, error;
699ea0fabbcSTim J. Robbins 	u_int32_t *vectp;
70031174518SJohn Baldwin 	char *stringp;
70131174518SJohn Baldwin 	uintptr_t destp, ustringp;
702ea0fabbcSTim J. Robbins 	struct linux32_ps_strings *arginfo;
7034048f59cSDmitry Chagin 	char canary[LINUX_AT_RANDOM_LEN];
7044048f59cSDmitry Chagin 	size_t execpath_len;
705ea0fabbcSTim J. Robbins 
7066bea696aSJohn Baldwin 	arginfo = (struct linux32_ps_strings *)PROC_PS_STRINGS(imgp->proc);
70731174518SJohn Baldwin 	destp = (uintptr_t)arginfo;
708ea0fabbcSTim J. Robbins 
709f04a0960SMark Johnston 	if (imgp->execpath != NULL && imgp->auxargs != NULL) {
710f04a0960SMark Johnston 		execpath_len = strlen(imgp->execpath) + 1;
71131174518SJohn Baldwin 		destp -= execpath_len;
71223a5b4edSJohn Baldwin 		destp = rounddown2(destp, sizeof(uint32_t));
713b24e6ac8SBrooks Davis 		imgp->execpathp = (void *)destp;
714b24e6ac8SBrooks Davis 		error = copyout(imgp->execpath, imgp->execpathp, execpath_len);
71503b0d68cSJohn Baldwin 		if (error != 0)
71603b0d68cSJohn Baldwin 			return (error);
7174048f59cSDmitry Chagin 	}
7184048f59cSDmitry Chagin 
7194ba25759SEd Maste 	/* Prepare the canary for SSP. */
7204048f59cSDmitry Chagin 	arc4rand(canary, sizeof(canary), 0);
72123a5b4edSJohn Baldwin 	destp -= roundup(sizeof(canary), sizeof(uint32_t));
722b24e6ac8SBrooks Davis 	imgp->canary = (void *)destp;
723b24e6ac8SBrooks Davis 	error = copyout(canary, imgp->canary, sizeof(canary));
72403b0d68cSJohn Baldwin 	if (error != 0)
72503b0d68cSJohn Baldwin 		return (error);
7264048f59cSDmitry Chagin 
72731174518SJohn Baldwin 	/* Allocate room for the argument and environment strings. */
72831174518SJohn Baldwin 	destp -= ARG_MAX - imgp->args->stringspace;
72923a5b4edSJohn Baldwin 	destp = rounddown2(destp, sizeof(uint32_t));
73031174518SJohn Baldwin 	ustringp = destp;
73131174518SJohn Baldwin 
73203b0d68cSJohn Baldwin 	if (imgp->auxargs) {
733d8010b11SJohn Baldwin 		/*
734d8010b11SJohn Baldwin 		 * Allocate room on the stack for the ELF auxargs
735d8010b11SJohn Baldwin 		 * array.  It has LINUX_AT_COUNT entries.
736d8010b11SJohn Baldwin 		 */
737d8010b11SJohn Baldwin 		destp -= LINUX_AT_COUNT * sizeof(Elf32_Auxinfo);
73823a5b4edSJohn Baldwin 		destp = rounddown2(destp, sizeof(uint32_t));
73903b0d68cSJohn Baldwin 	}
740ea0fabbcSTim J. Robbins 
74131174518SJohn Baldwin 	vectp = (uint32_t *)destp;
74231174518SJohn Baldwin 
74373c8686eSJohn Baldwin 	/*
74473c8686eSJohn Baldwin 	 * Allocate room for the argv[] and env vectors including the
74573c8686eSJohn Baldwin 	 * terminating NULL pointers.
74673c8686eSJohn Baldwin 	 */
74773c8686eSJohn Baldwin 	vectp -= imgp->args->argc + 1 + imgp->args->envc + 1;
74873c8686eSJohn Baldwin 
7494ba25759SEd Maste 	/* vectp also becomes our initial stack base. */
75031174518SJohn Baldwin 	*stack_base = (uintptr_t)vectp;
751ea0fabbcSTim J. Robbins 
752610ecfe0SMaxim Sobolev 	stringp = imgp->args->begin_argv;
753610ecfe0SMaxim Sobolev 	argc = imgp->args->argc;
754610ecfe0SMaxim Sobolev 	envc = imgp->args->envc;
75531174518SJohn Baldwin 
7564ba25759SEd Maste 	/* Copy out strings - arguments and environment. */
75731174518SJohn Baldwin 	error = copyout(stringp, (void *)ustringp,
75831174518SJohn Baldwin 	    ARG_MAX - imgp->args->stringspace);
75903b0d68cSJohn Baldwin 	if (error != 0)
76003b0d68cSJohn Baldwin 		return (error);
761ea0fabbcSTim J. Robbins 
7624ba25759SEd Maste 	/* Fill in "ps_strings" struct for ps, w, etc. */
76303b0d68cSJohn Baldwin 	if (suword32(&arginfo->ps_argvstr, (uint32_t)(intptr_t)vectp) != 0 ||
76403b0d68cSJohn Baldwin 	    suword32(&arginfo->ps_nargvstr, argc) != 0)
76503b0d68cSJohn Baldwin 		return (EFAULT);
766ea0fabbcSTim J. Robbins 
7674ba25759SEd Maste 	/* Fill in argument portion of vector table. */
768ea0fabbcSTim J. Robbins 	for (; argc > 0; --argc) {
76931174518SJohn Baldwin 		if (suword32(vectp++, ustringp) != 0)
77003b0d68cSJohn Baldwin 			return (EFAULT);
771ea0fabbcSTim J. Robbins 		while (*stringp++ != 0)
77231174518SJohn Baldwin 			ustringp++;
77331174518SJohn Baldwin 		ustringp++;
774ea0fabbcSTim J. Robbins 	}
775ea0fabbcSTim J. Robbins 
7764ba25759SEd Maste 	/* A null vector table pointer separates the argp's from the envp's. */
77703b0d68cSJohn Baldwin 	if (suword32(vectp++, 0) != 0)
77803b0d68cSJohn Baldwin 		return (EFAULT);
779ea0fabbcSTim J. Robbins 
78003b0d68cSJohn Baldwin 	if (suword32(&arginfo->ps_envstr, (uint32_t)(intptr_t)vectp) != 0 ||
78103b0d68cSJohn Baldwin 	    suword32(&arginfo->ps_nenvstr, envc) != 0)
78203b0d68cSJohn Baldwin 		return (EFAULT);
783ea0fabbcSTim J. Robbins 
7844ba25759SEd Maste 	/* Fill in environment portion of vector table. */
785ea0fabbcSTim J. Robbins 	for (; envc > 0; --envc) {
78631174518SJohn Baldwin 		if (suword32(vectp++, ustringp) != 0)
78703b0d68cSJohn Baldwin 			return (EFAULT);
788ea0fabbcSTim J. Robbins 		while (*stringp++ != 0)
78931174518SJohn Baldwin 			ustringp++;
79031174518SJohn Baldwin 		ustringp++;
791ea0fabbcSTim J. Robbins 	}
792ea0fabbcSTim J. Robbins 
7934ba25759SEd Maste 	/* The end of the vector table is a null pointer. */
79403b0d68cSJohn Baldwin 	if (suword32(vectp, 0) != 0)
79503b0d68cSJohn Baldwin 		return (EFAULT);
796ea0fabbcSTim J. Robbins 
797d8010b11SJohn Baldwin 	if (imgp->auxargs) {
798d8010b11SJohn Baldwin 		vectp++;
799d8010b11SJohn Baldwin 		error = imgp->sysent->sv_copyout_auxargs(imgp,
800d8010b11SJohn Baldwin 		    (uintptr_t)vectp);
801d8010b11SJohn Baldwin 		if (error != 0)
802d8010b11SJohn Baldwin 			return (error);
803d8010b11SJohn Baldwin 	}
804d8010b11SJohn Baldwin 
80503b0d68cSJohn Baldwin 	return (0);
806ea0fabbcSTim J. Robbins }
807ea0fabbcSTim J. Robbins 
8087029da5cSPawel Biernacki static SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
809ea0fabbcSTim J. Robbins     "32-bit Linux emulation");
810ea0fabbcSTim J. Robbins 
811ea0fabbcSTim J. Robbins static u_long	linux32_maxdsiz = LINUX32_MAXDSIZ;
812ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
813ea0fabbcSTim J. Robbins     &linux32_maxdsiz, 0, "");
814ea0fabbcSTim J. Robbins static u_long	linux32_maxssiz = LINUX32_MAXSSIZ;
815ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
816ea0fabbcSTim J. Robbins     &linux32_maxssiz, 0, "");
817ea0fabbcSTim J. Robbins static u_long	linux32_maxvmem = LINUX32_MAXVMEM;
818ea0fabbcSTim J. Robbins SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
819ea0fabbcSTim J. Robbins     &linux32_maxvmem, 0, "");
820d5dc757eSDmitry Chagin bool linux32_emulate_i386 = false;
821d5dc757eSDmitry Chagin SYSCTL_BOOL(_compat_linux32, OID_AUTO, emulate_i386, CTLFLAG_RWTUN,
822d5dc757eSDmitry Chagin     &linux32_emulate_i386, 0, "Emulate the real i386");
823ea0fabbcSTim J. Robbins 
824ea0fabbcSTim J. Robbins static void
82519059a13SJohn Baldwin linux32_fixlimit(struct rlimit *rl, int which)
826ea0fabbcSTim J. Robbins {
827ea0fabbcSTim J. Robbins 
82819059a13SJohn Baldwin 	switch (which) {
82919059a13SJohn Baldwin 	case RLIMIT_DATA:
830ea0fabbcSTim J. Robbins 		if (linux32_maxdsiz != 0) {
83119059a13SJohn Baldwin 			if (rl->rlim_cur > linux32_maxdsiz)
83219059a13SJohn Baldwin 				rl->rlim_cur = linux32_maxdsiz;
83319059a13SJohn Baldwin 			if (rl->rlim_max > linux32_maxdsiz)
83419059a13SJohn Baldwin 				rl->rlim_max = linux32_maxdsiz;
835ea0fabbcSTim J. Robbins 		}
83619059a13SJohn Baldwin 		break;
83719059a13SJohn Baldwin 	case RLIMIT_STACK:
838ea0fabbcSTim J. Robbins 		if (linux32_maxssiz != 0) {
83919059a13SJohn Baldwin 			if (rl->rlim_cur > linux32_maxssiz)
84019059a13SJohn Baldwin 				rl->rlim_cur = linux32_maxssiz;
84119059a13SJohn Baldwin 			if (rl->rlim_max > linux32_maxssiz)
84219059a13SJohn Baldwin 				rl->rlim_max = linux32_maxssiz;
843ea0fabbcSTim J. Robbins 		}
84419059a13SJohn Baldwin 		break;
84519059a13SJohn Baldwin 	case RLIMIT_VMEM:
846ea0fabbcSTim J. Robbins 		if (linux32_maxvmem != 0) {
84719059a13SJohn Baldwin 			if (rl->rlim_cur > linux32_maxvmem)
84819059a13SJohn Baldwin 				rl->rlim_cur = linux32_maxvmem;
84919059a13SJohn Baldwin 			if (rl->rlim_max > linux32_maxvmem)
85019059a13SJohn Baldwin 				rl->rlim_max = linux32_maxvmem;
851ea0fabbcSTim J. Robbins 		}
85219059a13SJohn Baldwin 		break;
85319059a13SJohn Baldwin 	}
854ea0fabbcSTim J. Robbins }
855ea0fabbcSTim J. Robbins 
856ea0fabbcSTim J. Robbins struct sysentvec elf_linux_sysvec = {
8572f99bcceSJohn Baldwin 	.sv_size	= LINUX32_SYS_MAXSYSCALL,
8582f99bcceSJohn Baldwin 	.sv_table	= linux32_sysent,
859dc858467SEd Maste 	.sv_fixup	= linux_fixup_elf,
860a8d403e1SKonstantin Belousov 	.sv_sendsig	= linux_sendsig,
8619931033bSDmitry Chagin 	.sv_sigcode	= &_binary_linux32_vdso_so_o_start,
862a8d403e1SKonstantin Belousov 	.sv_szsigcode	= &linux_szsigcode,
863a8d403e1SKonstantin Belousov 	.sv_name	= "Linux ELF32",
864a8d403e1SKonstantin Belousov 	.sv_coredump	= elf32_coredump,
865447636e4SEdward Tomasz Napierala 	.sv_elf_core_osabi = ELFOSABI_NONE,
866447636e4SEdward Tomasz Napierala 	.sv_elf_core_abi_vendor = LINUX_ABI_VENDOR,
867447636e4SEdward Tomasz Napierala 	.sv_elf_core_prepare_notes = linux32_prepare_notes,
868dc858467SEd Maste 	.sv_imgact_try	= linux_exec_imgact_try,
869a8d403e1SKonstantin Belousov 	.sv_minsigstksz	= LINUX_MINSIGSTKSZ,
870a8d403e1SKonstantin Belousov 	.sv_minuser	= VM_MIN_ADDRESS,
8718f1e49a6SDmitry Chagin 	.sv_maxuser	= LINUX32_MAXUSER,
872a8d403e1SKonstantin Belousov 	.sv_usrstack	= LINUX32_USRSTACK,
873a8d403e1SKonstantin Belousov 	.sv_psstrings	= LINUX32_PS_STRINGS,
8743fc21fddSMark Johnston 	.sv_psstringssz	= sizeof(struct linux32_ps_strings),
875a8d403e1SKonstantin Belousov 	.sv_stackprot	= VM_PROT_ALL,
8765caa67faSJohn Baldwin 	.sv_copyout_auxargs = linux_copyout_auxargs,
877a8d403e1SKonstantin Belousov 	.sv_copyout_strings = linux_copyout_strings,
878dc858467SEd Maste 	.sv_setregs	= linux_exec_setregs,
879a8d403e1SKonstantin Belousov 	.sv_fixlimit	= linux32_fixlimit,
880a8d403e1SKonstantin Belousov 	.sv_maxssiz	= &linux32_maxssiz,
881870e197dSKonstantin Belousov 	.sv_flags	= SV_ABI_LINUX | SV_ILP32 | SV_IA32 | SV_SHP |
8829931033bSDmitry Chagin 	    SV_SIG_DISCIGN | SV_SIG_WAITNDQ | SV_TIMEKEEP,
883c26391f4SEdward Tomasz Napierala 	.sv_set_syscall_retval = linux32_set_syscall_retval,
884afe1a688SKonstantin Belousov 	.sv_fetch_syscall_args = linux32_fetch_syscall_args,
885afe1a688SKonstantin Belousov 	.sv_syscallnames = NULL,
8868f1e49a6SDmitry Chagin 	.sv_shared_page_base = LINUX32_SHAREDPAGE,
8878f1e49a6SDmitry Chagin 	.sv_shared_page_len = PAGE_SIZE,
888e5d81ef1SDmitry Chagin 	.sv_schedtail	= linux_schedtail,
88981338031SDmitry Chagin 	.sv_thread_detach = linux_thread_detach,
890038c7205SDmitry Chagin 	.sv_trap	= NULL,
8915fd9cd53SDmitry Chagin 	.sv_onexec	= linux_on_exec_vmspace,
8924815f175SKonstantin Belousov 	.sv_onexit	= linux_on_exit,
8934815f175SKonstantin Belousov 	.sv_ontdexit	= linux_thread_dtor,
894598f6fb4SKonstantin Belousov 	.sv_setid_allowed = &linux_setid_allowed_query,
895de8374dfSDmitry Chagin 	.sv_set_fork_retval = linux32_set_fork_retval,
896ea0fabbcSTim J. Robbins };
897bdc37934SDmitry Chagin 
8985fd9cd53SDmitry Chagin static int
8995fd9cd53SDmitry Chagin linux_on_exec_vmspace(struct proc *p, struct image_params *imgp)
9005fd9cd53SDmitry Chagin {
9019931033bSDmitry Chagin 	int error;
9025fd9cd53SDmitry Chagin 
9039931033bSDmitry Chagin 	error = linux_map_vdso(p, linux_vdso_obj, linux_vdso_base,
9049931033bSDmitry Chagin 	    LINUX32_VDSOPAGE_SIZE, imgp);
9059931033bSDmitry Chagin 	if (error == 0)
9065fd9cd53SDmitry Chagin 		linux_on_exec(p, imgp);
9079931033bSDmitry Chagin 	return (error);
9085fd9cd53SDmitry Chagin }
9095fd9cd53SDmitry Chagin 
91009cffde9SDmitry Chagin /*
91109cffde9SDmitry Chagin  * linux_vdso_install() and linux_exec_sysvec_init() must be called
91209cffde9SDmitry Chagin  * after exec_sysvec_init() which is SI_SUB_EXEC (SI_ORDER_ANY).
91309cffde9SDmitry Chagin  */
914bdc37934SDmitry Chagin static void
9159931033bSDmitry Chagin linux_exec_sysvec_init(void *param)
9169931033bSDmitry Chagin {
9179931033bSDmitry Chagin 	l_uintptr_t *ktimekeep_base, *ktsc_selector;
9189931033bSDmitry Chagin 	struct sysentvec *sv;
9199931033bSDmitry Chagin 	ptrdiff_t tkoff;
9209931033bSDmitry Chagin 
9219931033bSDmitry Chagin 	sv = param;
9229931033bSDmitry Chagin 	/* Fill timekeep_base */
9239931033bSDmitry Chagin 	exec_sysvec_init(sv);
9249931033bSDmitry Chagin 
9259931033bSDmitry Chagin 	tkoff = kern_timekeep_base - linux_vdso_base;
9269931033bSDmitry Chagin 	ktimekeep_base = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
927*361971fbSKornel Dulęba 	*ktimekeep_base = sv->sv_shared_page_base + sv->sv_timekeep_offset;
9289931033bSDmitry Chagin 
9299931033bSDmitry Chagin 	tkoff = kern_tsc_selector - linux_vdso_base;
9309931033bSDmitry Chagin 	ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
9319931033bSDmitry Chagin 	*ktsc_selector = linux_vdso_tsc_selector_idx();
9329931033bSDmitry Chagin 	if (bootverbose)
9339931033bSDmitry Chagin 		printf("Linux i386 vDSO tsc_selector: %u\n", *ktsc_selector);
9345a6a4fb2SDmitry Chagin 
9355a6a4fb2SDmitry Chagin 	tkoff = kern_cpu_selector - linux_vdso_base;
9365a6a4fb2SDmitry Chagin 	ktsc_selector = (l_uintptr_t *)(linux_vdso_mapping + tkoff);
9375a6a4fb2SDmitry Chagin 	*ktsc_selector = linux_vdso_cpu_selector_idx();
9385a6a4fb2SDmitry Chagin 	if (bootverbose)
9395a6a4fb2SDmitry Chagin 		printf("Linux i386 vDSO cpu_selector: %u\n", *ktsc_selector);
9409931033bSDmitry Chagin }
94109cffde9SDmitry Chagin SYSINIT(elf_linux_exec_sysvec_init, SI_SUB_EXEC + 1, SI_ORDER_ANY,
9429931033bSDmitry Chagin     linux_exec_sysvec_init, &elf_linux_sysvec);
9439931033bSDmitry Chagin 
9449931033bSDmitry Chagin static void
945a543556cSDmitry Chagin linux_vdso_install(const void *param)
946bdc37934SDmitry Chagin {
9479931033bSDmitry Chagin 	char *vdso_start = &_binary_linux32_vdso_so_o_start;
9489931033bSDmitry Chagin 	char *vdso_end = &_binary_linux32_vdso_so_o_end;
949bdc37934SDmitry Chagin 
9509931033bSDmitry Chagin 	linux_szsigcode = vdso_end - vdso_start;
9519931033bSDmitry Chagin 	MPASS(linux_szsigcode <= LINUX32_VDSOPAGE_SIZE);
952bdc37934SDmitry Chagin 
9539931033bSDmitry Chagin 	linux_vdso_base = LINUX32_VDSOPAGE;
954bdc37934SDmitry Chagin 
9559931033bSDmitry Chagin 	__elfN(linux_vdso_fixup)(vdso_start, linux_vdso_base);
956bdc37934SDmitry Chagin 
9579931033bSDmitry Chagin 	linux_vdso_obj = __elfN(linux_shared_page_init)
9589931033bSDmitry Chagin 	    (&linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE);
9599931033bSDmitry Chagin 	bcopy(vdso_start, linux_vdso_mapping, linux_szsigcode);
960bdc37934SDmitry Chagin 
9619931033bSDmitry Chagin 	linux_vdso_reloc(linux_vdso_mapping, linux_vdso_base);
962bdc37934SDmitry Chagin }
96309cffde9SDmitry Chagin SYSINIT(elf_linux_vdso_init, SI_SUB_EXEC + 1, SI_ORDER_FIRST,
964f8268d4dSEd Maste     linux_vdso_install, NULL);
965bdc37934SDmitry Chagin 
966bdc37934SDmitry Chagin static void
967a543556cSDmitry Chagin linux_vdso_deinstall(const void *param)
968bdc37934SDmitry Chagin {
969bdc37934SDmitry Chagin 
9709931033bSDmitry Chagin 	__elfN(linux_shared_page_fini)(linux_vdso_obj,
9719931033bSDmitry Chagin 	    linux_vdso_mapping, LINUX32_VDSOPAGE_SIZE);
9727b194b3dSEd Maste }
973bdc37934SDmitry Chagin SYSUNINIT(elf_linux_vdso_uninit, SI_SUB_EXEC, SI_ORDER_FIRST,
974f8268d4dSEd Maste     linux_vdso_deinstall, NULL);
975ea0fabbcSTim J. Robbins 
9769931033bSDmitry Chagin static void
9779931033bSDmitry Chagin linux_vdso_reloc(char *mapping, Elf_Addr offset)
9789931033bSDmitry Chagin {
9799931033bSDmitry Chagin 	const Elf_Shdr *shdr;
9809931033bSDmitry Chagin 	const Elf_Rel *rel;
9819931033bSDmitry Chagin 	const Elf_Ehdr *ehdr;
9829931033bSDmitry Chagin 	Elf32_Addr *where;
9839931033bSDmitry Chagin 	Elf_Size rtype, symidx;
9849931033bSDmitry Chagin 	Elf32_Addr addr, addend;
9859931033bSDmitry Chagin 	int i, relcnt;
9869931033bSDmitry Chagin 
9879931033bSDmitry Chagin 	MPASS(offset != 0);
9889931033bSDmitry Chagin 
9899931033bSDmitry Chagin 	relcnt = 0;
9909931033bSDmitry Chagin 	ehdr = (const Elf_Ehdr *)mapping;
9919931033bSDmitry Chagin 	shdr = (const Elf_Shdr *)(mapping + ehdr->e_shoff);
9929931033bSDmitry Chagin 	for (i = 0; i < ehdr->e_shnum; i++)
9939931033bSDmitry Chagin 	{
9949931033bSDmitry Chagin 		switch (shdr[i].sh_type) {
9959931033bSDmitry Chagin 		case SHT_REL:
9969931033bSDmitry Chagin 			rel = (const Elf_Rel *)(mapping + shdr[i].sh_offset);
9979931033bSDmitry Chagin 			relcnt = shdr[i].sh_size / sizeof(*rel);
9989931033bSDmitry Chagin 			break;
9999931033bSDmitry Chagin 		case SHT_RELA:
10009931033bSDmitry Chagin 			printf("Linux i386 vDSO: unexpected Rela section\n");
10019931033bSDmitry Chagin 			break;
10029931033bSDmitry Chagin 		}
10039931033bSDmitry Chagin 	}
10049931033bSDmitry Chagin 
10059931033bSDmitry Chagin 	for (i = 0; i < relcnt; i++, rel++) {
10069931033bSDmitry Chagin 		where = (Elf32_Addr *)(mapping + rel->r_offset);
10079931033bSDmitry Chagin 		addend = *where;
10089931033bSDmitry Chagin 		rtype = ELF_R_TYPE(rel->r_info);
10099931033bSDmitry Chagin 		symidx = ELF_R_SYM(rel->r_info);
10109931033bSDmitry Chagin 
10119931033bSDmitry Chagin 		switch (rtype) {
10129931033bSDmitry Chagin 		case R_386_NONE:	/* none */
10139931033bSDmitry Chagin 			break;
10149931033bSDmitry Chagin 
10159931033bSDmitry Chagin 		case R_386_RELATIVE:	/* B + A */
10169931033bSDmitry Chagin 			addr = (Elf32_Addr)PTROUT(offset + addend);
10179931033bSDmitry Chagin 			if (*where != addr)
10189931033bSDmitry Chagin 				*where = addr;
10199931033bSDmitry Chagin 			break;
10209931033bSDmitry Chagin 
10219931033bSDmitry Chagin 		case R_386_IRELATIVE:
10229931033bSDmitry Chagin 			printf("Linux i386 vDSO: unexpected ifunc relocation, "
10239931033bSDmitry Chagin 			    "symbol index %ld\n", (intmax_t)symidx);
10249931033bSDmitry Chagin 			break;
10259931033bSDmitry Chagin 		default:
10269931033bSDmitry Chagin 			printf("Linux i386 vDSO: unexpected relocation type %ld, "
10279931033bSDmitry Chagin 			    "symbol index %ld\n", (intmax_t)rtype, (intmax_t)symidx);
10289931033bSDmitry Chagin 		}
10299931033bSDmitry Chagin 	}
10309931033bSDmitry Chagin }
10319931033bSDmitry Chagin 
103289ffc202SBjoern A. Zeeb static char GNU_ABI_VENDOR[] = "GNU";
103389ffc202SBjoern A. Zeeb static int GNULINUX_ABI_DESC = 0;
103489ffc202SBjoern A. Zeeb 
1035a95659f7SEd Maste static bool
103689ffc202SBjoern A. Zeeb linux32_trans_osrel(const Elf_Note *note, int32_t *osrel)
103789ffc202SBjoern A. Zeeb {
103889ffc202SBjoern A. Zeeb 	const Elf32_Word *desc;
103989ffc202SBjoern A. Zeeb 	uintptr_t p;
104089ffc202SBjoern A. Zeeb 
104189ffc202SBjoern A. Zeeb 	p = (uintptr_t)(note + 1);
104289ffc202SBjoern A. Zeeb 	p += roundup2(note->n_namesz, sizeof(Elf32_Addr));
104389ffc202SBjoern A. Zeeb 
104489ffc202SBjoern A. Zeeb 	desc = (const Elf32_Word *)p;
104589ffc202SBjoern A. Zeeb 	if (desc[0] != GNULINUX_ABI_DESC)
1046a95659f7SEd Maste 		return (false);
104789ffc202SBjoern A. Zeeb 
104889ffc202SBjoern A. Zeeb 	/*
104935755049SChuck Tuffli 	 * For Linux we encode osrel using the Linux convention of
105035755049SChuck Tuffli 	 * 	(version << 16) | (major << 8) | (minor)
105135755049SChuck Tuffli 	 * See macro in linux_mib.h
105289ffc202SBjoern A. Zeeb 	 */
105335755049SChuck Tuffli 	*osrel = LINUX_KERNVER(desc[1], desc[2], desc[3]);
105489ffc202SBjoern A. Zeeb 
1055a95659f7SEd Maste 	return (true);
105689ffc202SBjoern A. Zeeb }
105732c01de2SDmitry Chagin 
105832c01de2SDmitry Chagin static Elf_Brandnote linux32_brandnote = {
105989ffc202SBjoern A. Zeeb 	.hdr.n_namesz	= sizeof(GNU_ABI_VENDOR),
106089ffc202SBjoern A. Zeeb 	.hdr.n_descsz	= 16,	/* XXX at least 16 */
106132c01de2SDmitry Chagin 	.hdr.n_type	= 1,
106289ffc202SBjoern A. Zeeb 	.vendor		= GNU_ABI_VENDOR,
106389ffc202SBjoern A. Zeeb 	.flags		= BN_TRANSLATE_OSREL,
106489ffc202SBjoern A. Zeeb 	.trans_osrel	= linux32_trans_osrel
106532c01de2SDmitry Chagin };
106632c01de2SDmitry Chagin 
1067ea0fabbcSTim J. Robbins static Elf32_Brandinfo linux_brand = {
1068a8d403e1SKonstantin Belousov 	.brand		= ELFOSABI_LINUX,
1069a8d403e1SKonstantin Belousov 	.machine	= EM_386,
1070a8d403e1SKonstantin Belousov 	.compat_3_brand	= "Linux",
1071b5f20658SEdward Tomasz Napierala 	.emul_path	= linux_emul_path,
1072a8d403e1SKonstantin Belousov 	.interp_path	= "/lib/ld-linux.so.1",
1073a8d403e1SKonstantin Belousov 	.sysvec		= &elf_linux_sysvec,
1074a8d403e1SKonstantin Belousov 	.interp_newpath	= NULL,
107532c01de2SDmitry Chagin 	.brand_note	= &linux32_brandnote,
10762dedc128SDmitry Chagin 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1077ea0fabbcSTim J. Robbins };
1078ea0fabbcSTim J. Robbins 
1079ea0fabbcSTim J. Robbins static Elf32_Brandinfo linux_glibc2brand = {
1080a8d403e1SKonstantin Belousov 	.brand		= ELFOSABI_LINUX,
1081a8d403e1SKonstantin Belousov 	.machine	= EM_386,
1082a8d403e1SKonstantin Belousov 	.compat_3_brand	= "Linux",
1083b5f20658SEdward Tomasz Napierala 	.emul_path	= linux_emul_path,
1084a8d403e1SKonstantin Belousov 	.interp_path	= "/lib/ld-linux.so.2",
1085a8d403e1SKonstantin Belousov 	.sysvec		= &elf_linux_sysvec,
1086a8d403e1SKonstantin Belousov 	.interp_newpath	= NULL,
108732c01de2SDmitry Chagin 	.brand_note	= &linux32_brandnote,
10882dedc128SDmitry Chagin 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE
1089ea0fabbcSTim J. Robbins };
1090ea0fabbcSTim J. Robbins 
1091a0c59c7aSDmitry Chagin static Elf32_Brandinfo linux_muslbrand = {
1092a0c59c7aSDmitry Chagin 	.brand		= ELFOSABI_LINUX,
1093a0c59c7aSDmitry Chagin 	.machine	= EM_386,
1094a0c59c7aSDmitry Chagin 	.compat_3_brand	= "Linux",
1095b5f20658SEdward Tomasz Napierala 	.emul_path	= linux_emul_path,
1096a0c59c7aSDmitry Chagin 	.interp_path	= "/lib/ld-musl-i386.so.1",
1097a0c59c7aSDmitry Chagin 	.sysvec		= &elf_linux_sysvec,
1098a0c59c7aSDmitry Chagin 	.interp_newpath	= NULL,
1099a0c59c7aSDmitry Chagin 	.brand_note	= &linux32_brandnote,
1100cf8d74e3SDmitry Chagin 	.flags		= BI_CAN_EXEC_DYN | BI_BRAND_NOTE |
1101cf8d74e3SDmitry Chagin 			    LINUX_BI_FUTEX_REQUEUE
1102a0c59c7aSDmitry Chagin };
1103a0c59c7aSDmitry Chagin 
1104ea0fabbcSTim J. Robbins Elf32_Brandinfo *linux_brandlist[] = {
1105ea0fabbcSTim J. Robbins 	&linux_brand,
1106ea0fabbcSTim J. Robbins 	&linux_glibc2brand,
1107a0c59c7aSDmitry Chagin 	&linux_muslbrand,
1108ea0fabbcSTim J. Robbins 	NULL
1109ea0fabbcSTim J. Robbins };
1110ea0fabbcSTim J. Robbins 
1111ea0fabbcSTim J. Robbins static int
1112ea0fabbcSTim J. Robbins linux_elf_modevent(module_t mod, int type, void *data)
1113ea0fabbcSTim J. Robbins {
1114ea0fabbcSTim J. Robbins 	Elf32_Brandinfo **brandinfo;
1115ea0fabbcSTim J. Robbins 	int error;
1116ea0fabbcSTim J. Robbins 	struct linux_ioctl_handler **lihp;
1117ea0fabbcSTim J. Robbins 
1118ea0fabbcSTim J. Robbins 	error = 0;
1119ea0fabbcSTim J. Robbins 
1120ea0fabbcSTim J. Robbins 	switch(type) {
1121ea0fabbcSTim J. Robbins 	case MOD_LOAD:
1122ea0fabbcSTim J. Robbins 		for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1123ea0fabbcSTim J. Robbins 		     ++brandinfo)
1124ea0fabbcSTim J. Robbins 			if (elf32_insert_brand_entry(*brandinfo) < 0)
1125ea0fabbcSTim J. Robbins 				error = EINVAL;
1126ea0fabbcSTim J. Robbins 		if (error == 0) {
1127ea0fabbcSTim J. Robbins 			SET_FOREACH(lihp, linux_ioctl_handler_set)
11288fc08087STijl Coosemans 				linux32_ioctl_register_handler(*lihp);
11291ca16454SDmitry Chagin 			stclohz = (stathz ? stathz : hz);
1130ea0fabbcSTim J. Robbins 			if (bootverbose)
1131ae8330b4SDmitry Chagin 				printf("Linux i386 ELF exec handler installed\n");
1132ea0fabbcSTim J. Robbins 		} else
1133ae8330b4SDmitry Chagin 			printf("cannot insert Linux i386 ELF brand handler\n");
1134ea0fabbcSTim J. Robbins 		break;
1135ea0fabbcSTim J. Robbins 	case MOD_UNLOAD:
1136ea0fabbcSTim J. Robbins 		for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
1137ea0fabbcSTim J. Robbins 		     ++brandinfo)
1138ea0fabbcSTim J. Robbins 			if (elf32_brand_inuse(*brandinfo))
1139ea0fabbcSTim J. Robbins 				error = EBUSY;
1140ea0fabbcSTim J. Robbins 		if (error == 0) {
1141ea0fabbcSTim J. Robbins 			for (brandinfo = &linux_brandlist[0];
1142ea0fabbcSTim J. Robbins 			     *brandinfo != NULL; ++brandinfo)
1143ea0fabbcSTim J. Robbins 				if (elf32_remove_brand_entry(*brandinfo) < 0)
1144ea0fabbcSTim J. Robbins 					error = EINVAL;
1145ea0fabbcSTim J. Robbins 		}
1146ea0fabbcSTim J. Robbins 		if (error == 0) {
1147ea0fabbcSTim J. Robbins 			SET_FOREACH(lihp, linux_ioctl_handler_set)
11488fc08087STijl Coosemans 				linux32_ioctl_unregister_handler(*lihp);
1149ea0fabbcSTim J. Robbins 			if (bootverbose)
1150ae8330b4SDmitry Chagin 				printf("Linux i386 ELF exec handler removed\n");
1151ea0fabbcSTim J. Robbins 		} else
1152ae8330b4SDmitry Chagin 			printf("Could not deinstall Linux i386 ELF interpreter entry\n");
1153ea0fabbcSTim J. Robbins 		break;
1154ea0fabbcSTim J. Robbins 	default:
1155af682d48SDmitry Chagin 		return (EOPNOTSUPP);
1156ea0fabbcSTim J. Robbins 	}
1157af682d48SDmitry Chagin 	return (error);
1158ea0fabbcSTim J. Robbins }
1159ea0fabbcSTim J. Robbins 
1160ea0fabbcSTim J. Robbins static moduledata_t linux_elf_mod = {
1161ea0fabbcSTim J. Robbins 	"linuxelf",
1162ea0fabbcSTim J. Robbins 	linux_elf_modevent,
11639823d527SKevin Lo 	0
1164ea0fabbcSTim J. Robbins };
1165ea0fabbcSTim J. Robbins 
116678ae4338SKonstantin Belousov DECLARE_MODULE_TIED(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);
116767d39748SDmitry Chagin MODULE_DEPEND(linuxelf, linux_common, 1, 1, 1);
1168b6348be7SBaptiste Daroussin FEATURE(linux, "Linux 32bit support");
1169