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authorTim J. Robbins <tjr@FreeBSD.org>2004-08-16 07:55:06 +0000
committerTim J. Robbins <tjr@FreeBSD.org>2004-08-16 07:55:06 +0000
commitea0fabbc4fcb15d10fbcaad14c405826d5eefea3 (patch)
tree8db1b1fe965caf91b81508b975442417a3f13b98 /sys/amd64/linux32/linux32_sysvec.c
parent25aea0fcaa99d27cabdfaf648f97fceac8a4546d (diff)
downloadsrc-ea0fabbc4fcb15d10fbcaad14c405826d5eefea3.tar.gz
src-ea0fabbc4fcb15d10fbcaad14c405826d5eefea3.zip
Add preliminary support for running 32-bit Linux binaries on amd64, enabled
with the COMPAT_LINUX32 option. This is largely based on the i386 MD Linux emulations bits, but also builds on the 32-bit FreeBSD and generic IA-32 binary emulation work. Some of this is still a little rough around the edges, and will need to be revisited before 32-bit and 64-bit Linux emulation support can coexist in the same kernel.
Notes
Notes: svn path=/head/; revision=133819
Diffstat (limited to 'sys/amd64/linux32/linux32_sysvec.c')
-rw-r--r--sys/amd64/linux32/linux32_sysvec.c1088
1 files changed, 1088 insertions, 0 deletions
diff --git a/sys/amd64/linux32/linux32_sysvec.c b/sys/amd64/linux32/linux32_sysvec.c
new file mode 100644
index 000000000000..aec316cc9b32
--- /dev/null
+++ b/sys/amd64/linux32/linux32_sysvec.c
@@ -0,0 +1,1088 @@
+/*-
+ * Copyright (c) 2004 Tim J. Robbins
+ * Copyright (c) 2003 Peter Wemm
+ * Copyright (c) 2002 Doug Rabson
+ * Copyright (c) 1998-1999 Andrew Gallatin
+ * Copyright (c) 1994-1996 Søren Schmidt
+ * 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
+ * in this position and unchanged.
+ * 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.
+ * 3. The name of the author may not be used to endorse or promote products
+ * derived from this software without specific prior written permission
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/* XXX we use functions that might not exist. */
+#include "opt_compat.h"
+#include "opt_ia32.h"
+
+#ifndef COMPAT_43
+#error "Unable to compile Linux-emulator due to missing COMPAT_43 option!"
+#endif
+#ifndef IA32
+#error "Unable to compile Linux-emulator due to missing IA32 option!"
+#endif
+
+#define __ELF_WORD_SIZE 32
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/exec.h>
+#include <sys/imgact.h>
+#include <sys/imgact_elf.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+#include <sys/sysctl.h>
+#include <sys/syscallsubr.h>
+#include <sys/sysent.h>
+#include <sys/sysproto.h>
+#include <sys/user.h>
+#include <sys/vnode.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_extern.h>
+#include <vm/vm_map.h>
+#include <vm/vm_object.h>
+#include <vm/vm_page.h>
+#include <vm/vm_param.h>
+
+#include <machine/cpu.h>
+#include <machine/md_var.h>
+#include <machine/specialreg.h>
+
+#include <amd64/linux32/linux.h>
+#include <amd64/linux32/linux32_proto.h>
+#include <compat/linux/linux_mib.h>
+#include <compat/linux/linux_signal.h>
+#include <compat/linux/linux_util.h>
+
+MODULE_VERSION(linux, 1);
+MODULE_DEPEND(linux, sysvmsg, 1, 1, 1);
+MODULE_DEPEND(linux, sysvsem, 1, 1, 1);
+MODULE_DEPEND(linux, sysvshm, 1, 1, 1);
+
+MALLOC_DEFINE(M_LINUX, "linux", "Linux mode structures");
+
+#define AUXARGS_ENTRY_32(pos, id, val) \
+ do { \
+ suword32(pos++, id); \
+ suword32(pos++, val); \
+ } while (0)
+
+#if BYTE_ORDER == LITTLE_ENDIAN
+#define SHELLMAGIC 0x2123 /* #! */
+#else
+#define SHELLMAGIC 0x2321
+#endif
+
+/*
+ * Allow the sendsig functions to use the ldebug() facility
+ * even though they are not syscalls themselves. Map them
+ * to syscall 0. This is slightly less bogus than using
+ * ldebug(sigreturn).
+ */
+#define LINUX_SYS_linux_rt_sendsig 0
+#define LINUX_SYS_linux_sendsig 0
+
+extern char linux_sigcode[];
+extern int linux_szsigcode;
+
+extern struct sysent linux_sysent[LINUX_SYS_MAXSYSCALL];
+
+SET_DECLARE(linux_ioctl_handler_set, struct linux_ioctl_handler);
+
+static int elf_linux_fixup(register_t **stack_base,
+ struct image_params *iparams);
+static register_t *linux_copyout_strings(struct image_params *imgp);
+static void linux_prepsyscall(struct trapframe *tf, int *args, u_int *code,
+ caddr_t *params);
+static void linux_sendsig(sig_t catcher, int sig, sigset_t *mask,
+ u_long code);
+static void exec_linux_setregs(struct thread *td, u_long entry,
+ u_long stack, u_long ps_strings);
+static void linux32_fixlimits(struct image_params *imgp);
+
+/*
+ * Linux syscalls return negative errno's, we do positive and map them
+ */
+static int bsd_to_linux_errno[ELAST + 1] = {
+ -0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
+ -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
+ -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
+ -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
+ -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
+ -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
+ -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
+ -116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
+ -6, -6, -43, -42, -75, -6, -84
+};
+
+int bsd_to_linux_signal[LINUX_SIGTBLSZ] = {
+ LINUX_SIGHUP, LINUX_SIGINT, LINUX_SIGQUIT, LINUX_SIGILL,
+ LINUX_SIGTRAP, LINUX_SIGABRT, 0, LINUX_SIGFPE,
+ LINUX_SIGKILL, LINUX_SIGBUS, LINUX_SIGSEGV, LINUX_SIGSYS,
+ LINUX_SIGPIPE, LINUX_SIGALRM, LINUX_SIGTERM, LINUX_SIGURG,
+ LINUX_SIGSTOP, LINUX_SIGTSTP, LINUX_SIGCONT, LINUX_SIGCHLD,
+ LINUX_SIGTTIN, LINUX_SIGTTOU, LINUX_SIGIO, LINUX_SIGXCPU,
+ LINUX_SIGXFSZ, LINUX_SIGVTALRM, LINUX_SIGPROF, LINUX_SIGWINCH,
+ 0, LINUX_SIGUSR1, LINUX_SIGUSR2
+};
+
+int linux_to_bsd_signal[LINUX_SIGTBLSZ] = {
+ SIGHUP, SIGINT, SIGQUIT, SIGILL,
+ SIGTRAP, SIGABRT, SIGBUS, SIGFPE,
+ SIGKILL, SIGUSR1, SIGSEGV, SIGUSR2,
+ SIGPIPE, SIGALRM, SIGTERM, SIGBUS,
+ SIGCHLD, SIGCONT, SIGSTOP, SIGTSTP,
+ SIGTTIN, SIGTTOU, SIGURG, SIGXCPU,
+ SIGXFSZ, SIGVTALRM, SIGPROF, SIGWINCH,
+ SIGIO, SIGURG, SIGSYS
+};
+
+#define LINUX_T_UNKNOWN 255
+static int _bsd_to_linux_trapcode[] = {
+ LINUX_T_UNKNOWN, /* 0 */
+ 6, /* 1 T_PRIVINFLT */
+ LINUX_T_UNKNOWN, /* 2 */
+ 3, /* 3 T_BPTFLT */
+ LINUX_T_UNKNOWN, /* 4 */
+ LINUX_T_UNKNOWN, /* 5 */
+ 16, /* 6 T_ARITHTRAP */
+ 254, /* 7 T_ASTFLT */
+ LINUX_T_UNKNOWN, /* 8 */
+ 13, /* 9 T_PROTFLT */
+ 1, /* 10 T_TRCTRAP */
+ LINUX_T_UNKNOWN, /* 11 */
+ 14, /* 12 T_PAGEFLT */
+ LINUX_T_UNKNOWN, /* 13 */
+ 17, /* 14 T_ALIGNFLT */
+ LINUX_T_UNKNOWN, /* 15 */
+ LINUX_T_UNKNOWN, /* 16 */
+ LINUX_T_UNKNOWN, /* 17 */
+ 0, /* 18 T_DIVIDE */
+ 2, /* 19 T_NMI */
+ 4, /* 20 T_OFLOW */
+ 5, /* 21 T_BOUND */
+ 7, /* 22 T_DNA */
+ 8, /* 23 T_DOUBLEFLT */
+ 9, /* 24 T_FPOPFLT */
+ 10, /* 25 T_TSSFLT */
+ 11, /* 26 T_SEGNPFLT */
+ 12, /* 27 T_STKFLT */
+ 18, /* 28 T_MCHK */
+ 19, /* 29 T_XMMFLT */
+ 15 /* 30 T_RESERVED */
+};
+#define bsd_to_linux_trapcode(code) \
+ ((code)<sizeof(_bsd_to_linux_trapcode)/sizeof(*_bsd_to_linux_trapcode)? \
+ _bsd_to_linux_trapcode[(code)]: \
+ LINUX_T_UNKNOWN)
+
+struct linux32_ps_strings {
+ u_int32_t ps_argvstr; /* first of 0 or more argument strings */
+ int ps_nargvstr; /* the number of argument strings */
+ u_int32_t ps_envstr; /* first of 0 or more environment strings */
+ int ps_nenvstr; /* the number of environment strings */
+};
+
+/*
+ * If FreeBSD & Linux have a difference of opinion about what a trap
+ * means, deal with it here.
+ *
+ * MPSAFE
+ */
+static int
+translate_traps(int signal, int trap_code)
+{
+ if (signal != SIGBUS)
+ return signal;
+ switch (trap_code) {
+ case T_PROTFLT:
+ case T_TSSFLT:
+ case T_DOUBLEFLT:
+ case T_PAGEFLT:
+ return SIGSEGV;
+ default:
+ return signal;
+ }
+}
+
+static int
+elf_linux_fixup(register_t **stack_base, struct image_params *imgp)
+{
+ Elf32_Auxargs *args;
+ Elf32_Addr *base;
+ Elf32_Addr *pos;
+
+ KASSERT(curthread->td_proc == imgp->proc &&
+ (curthread->td_proc->p_flag & P_SA) == 0,
+ ("unsafe elf_linux_fixup(), should be curproc"));
+ base = (Elf32_Addr *)*stack_base;
+ args = (Elf32_Auxargs *)imgp->auxargs;
+ pos = base + (imgp->argc + imgp->envc + 2);
+
+ if (args->trace)
+ AUXARGS_ENTRY_32(pos, AT_DEBUG, 1);
+ if (args->execfd != -1)
+ AUXARGS_ENTRY_32(pos, AT_EXECFD, args->execfd);
+ AUXARGS_ENTRY_32(pos, AT_PHDR, args->phdr);
+ AUXARGS_ENTRY_32(pos, AT_PHENT, args->phent);
+ AUXARGS_ENTRY_32(pos, AT_PHNUM, args->phnum);
+ AUXARGS_ENTRY_32(pos, AT_PAGESZ, args->pagesz);
+ AUXARGS_ENTRY_32(pos, AT_FLAGS, args->flags);
+ AUXARGS_ENTRY_32(pos, AT_ENTRY, args->entry);
+ AUXARGS_ENTRY_32(pos, AT_BASE, args->base);
+ AUXARGS_ENTRY_32(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
+ AUXARGS_ENTRY_32(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
+ AUXARGS_ENTRY_32(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
+ AUXARGS_ENTRY_32(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
+ AUXARGS_ENTRY_32(pos, AT_NULL, 0);
+
+ free(imgp->auxargs, M_TEMP);
+ imgp->auxargs = NULL;
+
+ base--;
+ suword32(base, (uint32_t)imgp->argc);
+ *stack_base = (register_t *)base;
+ return 0;
+}
+
+extern int _ucodesel, _ucode32sel, _udatasel;
+extern unsigned long linux_sznonrtsigcode;
+
+static void
+linux_rt_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
+{
+ struct thread *td = curthread;
+ struct proc *p = td->td_proc;
+ struct sigacts *psp;
+ struct trapframe *regs;
+ struct l_rt_sigframe *fp, frame;
+ int oonstack;
+
+ PROC_LOCK_ASSERT(p, MA_OWNED);
+ psp = p->p_sigacts;
+ mtx_assert(&psp->ps_mtx, MA_OWNED);
+ regs = td->td_frame;
+ oonstack = sigonstack(regs->tf_rsp);
+
+#ifdef DEBUG
+ if (ldebug(rt_sendsig))
+ printf(ARGS(rt_sendsig, "%p, %d, %p, %lu"),
+ catcher, sig, (void*)mask, code);
+#endif
+ /*
+ * Allocate space for the signal handler context.
+ */
+ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
+ SIGISMEMBER(psp->ps_sigonstack, sig)) {
+ fp = (struct l_rt_sigframe *)(td->td_sigstk.ss_sp +
+ td->td_sigstk.ss_size - sizeof(struct l_rt_sigframe));
+ } else
+ fp = (struct l_rt_sigframe *)regs->tf_rsp - 1;
+ mtx_unlock(&psp->ps_mtx);
+
+ /*
+ * Build the argument list for the signal handler.
+ */
+ if (p->p_sysent->sv_sigtbl)
+ if (sig <= p->p_sysent->sv_sigsize)
+ sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
+
+ bzero(&frame, sizeof(frame));
+
+ frame.sf_handler = PTROUT(catcher);
+ frame.sf_sig = sig;
+ frame.sf_siginfo = PTROUT(&fp->sf_si);
+ frame.sf_ucontext = PTROUT(&fp->sf_sc);
+
+ /* Fill in POSIX parts */
+ frame.sf_si.lsi_signo = sig;
+ frame.sf_si.lsi_code = code;
+ frame.sf_si.lsi_addr = PTROUT(regs->tf_err);
+
+ /*
+ * Build the signal context to be used by sigreturn.
+ */
+ frame.sf_sc.uc_flags = 0; /* XXX ??? */
+ frame.sf_sc.uc_link = 0; /* XXX ??? */
+
+ frame.sf_sc.uc_stack.ss_sp = PTROUT(td->td_sigstk.ss_sp);
+ frame.sf_sc.uc_stack.ss_size = td->td_sigstk.ss_size;
+ frame.sf_sc.uc_stack.ss_flags = (td->td_pflags & TDP_ALTSTACK)
+ ? ((oonstack) ? LINUX_SS_ONSTACK : 0) : LINUX_SS_DISABLE;
+ PROC_UNLOCK(p);
+
+ bsd_to_linux_sigset(mask, &frame.sf_sc.uc_sigmask);
+
+ frame.sf_sc.uc_mcontext.sc_mask = frame.sf_sc.uc_sigmask.__bits[0];
+ frame.sf_sc.uc_mcontext.sc_gs = rgs();
+ frame.sf_sc.uc_mcontext.sc_fs = rfs();
+ __asm __volatile("movl %%es,%0" :
+ "=rm" (frame.sf_sc.uc_mcontext.sc_es));
+ __asm __volatile("movl %%ds,%0" :
+ "=rm" (frame.sf_sc.uc_mcontext.sc_ds));
+ frame.sf_sc.uc_mcontext.sc_edi = regs->tf_rdi;
+ frame.sf_sc.uc_mcontext.sc_esi = regs->tf_rsi;
+ frame.sf_sc.uc_mcontext.sc_ebp = regs->tf_rbp;
+ frame.sf_sc.uc_mcontext.sc_ebx = regs->tf_rbx;
+ frame.sf_sc.uc_mcontext.sc_edx = regs->tf_rdx;
+ frame.sf_sc.uc_mcontext.sc_ecx = regs->tf_rcx;
+ frame.sf_sc.uc_mcontext.sc_eax = regs->tf_rax;
+ frame.sf_sc.uc_mcontext.sc_eip = regs->tf_rip;
+ frame.sf_sc.uc_mcontext.sc_cs = regs->tf_cs;
+ frame.sf_sc.uc_mcontext.sc_eflags = regs->tf_rflags;
+ frame.sf_sc.uc_mcontext.sc_esp_at_signal = regs->tf_rsp;
+ frame.sf_sc.uc_mcontext.sc_ss = regs->tf_ss;
+ frame.sf_sc.uc_mcontext.sc_err = regs->tf_err;
+ frame.sf_sc.uc_mcontext.sc_trapno = bsd_to_linux_trapcode(code);
+
+#ifdef DEBUG
+ if (ldebug(rt_sendsig))
+ printf(LMSG("rt_sendsig flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
+ frame.sf_sc.uc_stack.ss_flags, td->td_sigstk.ss_sp,
+ td->td_sigstk.ss_size, frame.sf_sc.uc_mcontext.sc_mask);
+#endif
+
+ if (copyout(&frame, fp, sizeof(frame)) != 0) {
+ /*
+ * Process has trashed its stack; give it an illegal
+ * instruction to halt it in its tracks.
+ */
+#ifdef DEBUG
+ if (ldebug(rt_sendsig))
+ printf(LMSG("rt_sendsig: bad stack %p, oonstack=%x"),
+ fp, oonstack);
+#endif
+ PROC_LOCK(p);
+ sigexit(td, SIGILL);
+ }
+
+ /*
+ * Build context to run handler in.
+ */
+ regs->tf_rsp = PTROUT(fp);
+ regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode) +
+ linux_sznonrtsigcode;
+ regs->tf_rflags &= ~PSL_T;
+ regs->tf_cs = _ucode32sel;
+ regs->tf_ss = _udatasel;
+ load_ds(_udatasel);
+ td->td_pcb->pcb_ds = _udatasel;
+ load_es(_udatasel);
+ td->td_pcb->pcb_es = _udatasel;
+ PROC_LOCK(p);
+ mtx_lock(&psp->ps_mtx);
+}
+
+
+/*
+ * Send an interrupt to process.
+ *
+ * Stack is set up to allow sigcode stored
+ * in u. to call routine, followed by kcall
+ * to sigreturn routine below. After sigreturn
+ * resets the signal mask, the stack, and the
+ * frame pointer, it returns to the user
+ * specified pc, psl.
+ */
+static void
+linux_sendsig(sig_t catcher, int sig, sigset_t *mask, u_long code)
+{
+ struct thread *td = curthread;
+ struct proc *p = td->td_proc;
+ struct sigacts *psp;
+ struct trapframe *regs;
+ struct l_sigframe *fp, frame;
+ l_sigset_t lmask;
+ int oonstack, i;
+
+ PROC_LOCK_ASSERT(p, MA_OWNED);
+ psp = p->p_sigacts;
+ mtx_assert(&psp->ps_mtx, MA_OWNED);
+ if (SIGISMEMBER(psp->ps_siginfo, sig)) {
+ /* Signal handler installed with SA_SIGINFO. */
+ linux_rt_sendsig(catcher, sig, mask, code);
+ return;
+ }
+
+ regs = td->td_frame;
+ oonstack = sigonstack(regs->tf_rsp);
+
+#ifdef DEBUG
+ if (ldebug(sendsig))
+ printf(ARGS(sendsig, "%p, %d, %p, %lu"),
+ catcher, sig, (void*)mask, code);
+#endif
+
+ /*
+ * Allocate space for the signal handler context.
+ */
+ if ((td->td_pflags & TDP_ALTSTACK) && !oonstack &&
+ SIGISMEMBER(psp->ps_sigonstack, sig)) {
+ fp = (struct l_sigframe *)(td->td_sigstk.ss_sp +
+ td->td_sigstk.ss_size - sizeof(struct l_sigframe));
+ } else
+ fp = (struct l_sigframe *)regs->tf_rsp - 1;
+ mtx_unlock(&psp->ps_mtx);
+ PROC_UNLOCK(p);
+
+ /*
+ * Build the argument list for the signal handler.
+ */
+ if (p->p_sysent->sv_sigtbl)
+ if (sig <= p->p_sysent->sv_sigsize)
+ sig = p->p_sysent->sv_sigtbl[_SIG_IDX(sig)];
+
+ bzero(&frame, sizeof(frame));
+
+ frame.sf_handler = PTROUT(catcher);
+ frame.sf_sig = sig;
+
+ bsd_to_linux_sigset(mask, &lmask);
+
+ /*
+ * Build the signal context to be used by sigreturn.
+ */
+ frame.sf_sc.sc_mask = lmask.__bits[0];
+ frame.sf_sc.sc_gs = rgs();
+ frame.sf_sc.sc_fs = rfs();
+ __asm __volatile("movl %%es,%0" : "=rm" (frame.sf_sc.sc_es));
+ __asm __volatile("movl %%ds,%0" : "=rm" (frame.sf_sc.sc_ds));
+ frame.sf_sc.sc_edi = regs->tf_rdi;
+ frame.sf_sc.sc_esi = regs->tf_rsi;
+ frame.sf_sc.sc_ebp = regs->tf_rbp;
+ frame.sf_sc.sc_ebx = regs->tf_rbx;
+ frame.sf_sc.sc_edx = regs->tf_rdx;
+ frame.sf_sc.sc_ecx = regs->tf_rcx;
+ frame.sf_sc.sc_eax = regs->tf_rax;
+ frame.sf_sc.sc_eip = regs->tf_rip;
+ frame.sf_sc.sc_cs = regs->tf_cs;
+ frame.sf_sc.sc_eflags = regs->tf_rflags;
+ frame.sf_sc.sc_esp_at_signal = regs->tf_rsp;
+ frame.sf_sc.sc_ss = regs->tf_ss;
+ frame.sf_sc.sc_err = regs->tf_err;
+ frame.sf_sc.sc_trapno = bsd_to_linux_trapcode(code);
+
+ for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
+ frame.sf_extramask[i] = lmask.__bits[i+1];
+
+ if (copyout(&frame, fp, sizeof(frame)) != 0) {
+ /*
+ * Process has trashed its stack; give it an illegal
+ * instruction to halt it in its tracks.
+ */
+ PROC_LOCK(p);
+ sigexit(td, SIGILL);
+ }
+
+ /*
+ * Build context to run handler in.
+ */
+ regs->tf_rsp = PTROUT(fp);
+ regs->tf_rip = LINUX32_PS_STRINGS - *(p->p_sysent->sv_szsigcode);
+ regs->tf_rflags &= ~PSL_T;
+ regs->tf_cs = _ucode32sel;
+ regs->tf_ss = _udatasel;
+ load_ds(_udatasel);
+ td->td_pcb->pcb_ds = _udatasel;
+ load_es(_udatasel);
+ td->td_pcb->pcb_es = _udatasel;
+ PROC_LOCK(p);
+ mtx_lock(&psp->ps_mtx);
+}
+
+/*
+ * System call to cleanup state after a signal
+ * has been taken. Reset signal mask and
+ * stack state from context left by sendsig (above).
+ * Return to previous pc and psl as specified by
+ * context left by sendsig. Check carefully to
+ * make sure that the user has not modified the
+ * psl to gain improper privileges or to cause
+ * a machine fault.
+ */
+int
+linux_sigreturn(struct thread *td, struct linux_sigreturn_args *args)
+{
+ struct proc *p = td->td_proc;
+ struct l_sigframe frame;
+ struct trapframe *regs;
+ l_sigset_t lmask;
+ int eflags, i;
+
+ regs = td->td_frame;
+
+#ifdef DEBUG
+ if (ldebug(sigreturn))
+ printf(ARGS(sigreturn, "%p"), (void *)args->sfp);
+#endif
+ /*
+ * The trampoline code hands us the sigframe.
+ * It is unsafe to keep track of it ourselves, in the event that a
+ * program jumps out of a signal handler.
+ */
+ if (copyin(args->sfp, &frame, sizeof(frame)) != 0)
+ return (EFAULT);
+
+ /*
+ * Check for security violations.
+ */
+#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
+ eflags = frame.sf_sc.sc_eflags;
+ /*
+ * XXX do allow users to change the privileged flag PSL_RF. The
+ * cpu sets PSL_RF in tf_eflags for faults. Debuggers should
+ * sometimes set it there too. tf_eflags is kept in the signal
+ * context during signal handling and there is no other place
+ * to remember it, so the PSL_RF bit may be corrupted by the
+ * signal handler without us knowing. Corruption of the PSL_RF
+ * bit at worst causes one more or one less debugger trap, so
+ * allowing it is fairly harmless.
+ */
+ if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF))
+ return(EINVAL);
+
+ /*
+ * Don't allow users to load a valid privileged %cs. Let the
+ * hardware check for invalid selectors, excess privilege in
+ * other selectors, invalid %eip's and invalid %esp's.
+ */
+#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
+ if (!CS_SECURE(frame.sf_sc.sc_cs)) {
+ trapsignal(td, SIGBUS, T_PROTFLT);
+ return(EINVAL);
+ }
+
+ lmask.__bits[0] = frame.sf_sc.sc_mask;
+ for (i = 0; i < (LINUX_NSIG_WORDS-1); i++)
+ lmask.__bits[i+1] = frame.sf_extramask[i];
+ PROC_LOCK(p);
+ linux_to_bsd_sigset(&lmask, &td->td_sigmask);
+ SIG_CANTMASK(td->td_sigmask);
+ signotify(td);
+ PROC_UNLOCK(p);
+
+ /*
+ * Restore signal context.
+ */
+ /* Selectors were restored by the trampoline. */
+ regs->tf_rdi = frame.sf_sc.sc_edi;
+ regs->tf_rsi = frame.sf_sc.sc_esi;
+ regs->tf_rbp = frame.sf_sc.sc_ebp;
+ regs->tf_rbx = frame.sf_sc.sc_ebx;
+ regs->tf_rdx = frame.sf_sc.sc_edx;
+ regs->tf_rcx = frame.sf_sc.sc_ecx;
+ regs->tf_rax = frame.sf_sc.sc_eax;
+ regs->tf_rip = frame.sf_sc.sc_eip;
+ regs->tf_cs = frame.sf_sc.sc_cs;
+ regs->tf_rflags = eflags;
+ regs->tf_rsp = frame.sf_sc.sc_esp_at_signal;
+ regs->tf_ss = frame.sf_sc.sc_ss;
+
+ return (EJUSTRETURN);
+}
+
+/*
+ * System call to cleanup state after a signal
+ * has been taken. Reset signal mask and
+ * stack state from context left by rt_sendsig (above).
+ * Return to previous pc and psl as specified by
+ * context left by sendsig. Check carefully to
+ * make sure that the user has not modified the
+ * psl to gain improper privileges or to cause
+ * a machine fault.
+ */
+int
+linux_rt_sigreturn(struct thread *td, struct linux_rt_sigreturn_args *args)
+{
+ struct proc *p = td->td_proc;
+ struct l_ucontext uc;
+ struct l_sigcontext *context;
+ l_stack_t *lss;
+ stack_t ss;
+ struct trapframe *regs;
+ int eflags;
+
+ regs = td->td_frame;
+
+#ifdef DEBUG
+ if (ldebug(rt_sigreturn))
+ printf(ARGS(rt_sigreturn, "%p"), (void *)args->ucp);
+#endif
+ /*
+ * The trampoline code hands us the ucontext.
+ * It is unsafe to keep track of it ourselves, in the event that a
+ * program jumps out of a signal handler.
+ */
+ if (copyin(args->ucp, &uc, sizeof(uc)) != 0)
+ return (EFAULT);
+
+ context = &uc.uc_mcontext;
+
+ /*
+ * Check for security violations.
+ */
+#define EFLAGS_SECURE(ef, oef) ((((ef) ^ (oef)) & ~PSL_USERCHANGE) == 0)
+ eflags = context->sc_eflags;
+ /*
+ * XXX do allow users to change the privileged flag PSL_RF. The
+ * cpu sets PSL_RF in tf_eflags for faults. Debuggers should
+ * sometimes set it there too. tf_eflags is kept in the signal
+ * context during signal handling and there is no other place
+ * to remember it, so the PSL_RF bit may be corrupted by the
+ * signal handler without us knowing. Corruption of the PSL_RF
+ * bit at worst causes one more or one less debugger trap, so
+ * allowing it is fairly harmless.
+ */
+ if (!EFLAGS_SECURE(eflags & ~PSL_RF, regs->tf_rflags & ~PSL_RF))
+ return(EINVAL);
+
+ /*
+ * Don't allow users to load a valid privileged %cs. Let the
+ * hardware check for invalid selectors, excess privilege in
+ * other selectors, invalid %eip's and invalid %esp's.
+ */
+#define CS_SECURE(cs) (ISPL(cs) == SEL_UPL)
+ if (!CS_SECURE(context->sc_cs)) {
+ trapsignal(td, SIGBUS, T_PROTFLT);
+ return(EINVAL);
+ }
+
+ PROC_LOCK(p);
+ linux_to_bsd_sigset(&uc.uc_sigmask, &td->td_sigmask);
+ SIG_CANTMASK(td->td_sigmask);
+ signotify(td);
+ PROC_UNLOCK(p);
+
+ /*
+ * Restore signal context
+ */
+ /* Selectors were restored by the trampoline. */
+ regs->tf_rdi = context->sc_edi;
+ regs->tf_rsi = context->sc_esi;
+ regs->tf_rbp = context->sc_ebp;
+ regs->tf_rbx = context->sc_ebx;
+ regs->tf_rdx = context->sc_edx;
+ regs->tf_rcx = context->sc_ecx;
+ regs->tf_rax = context->sc_eax;
+ regs->tf_rip = context->sc_eip;
+ regs->tf_cs = context->sc_cs;
+ regs->tf_rflags = eflags;
+ regs->tf_rsp = context->sc_esp_at_signal;
+ regs->tf_ss = context->sc_ss;
+
+ /*
+ * call sigaltstack & ignore results..
+ */
+ lss = &uc.uc_stack;
+ ss.ss_sp = PTRIN(lss->ss_sp);
+ ss.ss_size = lss->ss_size;
+ ss.ss_flags = linux_to_bsd_sigaltstack(lss->ss_flags);
+
+#ifdef DEBUG
+ if (ldebug(rt_sigreturn))
+ printf(LMSG("rt_sigret flags: 0x%x, sp: %p, ss: 0x%x, mask: 0x%x"),
+ ss.ss_flags, ss.ss_sp, ss.ss_size, context->sc_mask);
+#endif
+ (void)kern_sigaltstack(td, &ss, NULL);
+
+ return (EJUSTRETURN);
+}
+
+/*
+ * MPSAFE
+ */
+static void
+linux_prepsyscall(struct trapframe *tf, int *args, u_int *code, caddr_t *params)
+{
+ args[0] = tf->tf_rbx;
+ args[1] = tf->tf_rcx;
+ args[2] = tf->tf_rdx;
+ args[3] = tf->tf_rsi;
+ args[4] = tf->tf_rdi;
+ args[5] = tf->tf_rbp; /* Unconfirmed */
+ *params = NULL; /* no copyin */
+}
+
+/*
+ * If a linux binary is exec'ing something, try this image activator
+ * first. We override standard shell script execution in order to
+ * be able to modify the interpreter path. We only do this if a linux
+ * binary is doing the exec, so we do not create an EXEC module for it.
+ */
+static int exec_linux_imgact_try(struct image_params *iparams);
+
+static int
+exec_linux_imgact_try(struct image_params *imgp)
+{
+ const char *head = (const char *)imgp->image_header;
+ int error = -1;
+
+ /*
+ * The interpreter for shell scripts run from a linux binary needs
+ * to be located in /compat/linux if possible in order to recursively
+ * maintain linux path emulation.
+ */
+ if (((const short *)head)[0] == SHELLMAGIC) {
+ /*
+ * Run our normal shell image activator. If it succeeds attempt
+ * to use the alternate path for the interpreter. If an alternate
+ * path is found, use our stringspace to store it.
+ */
+ if ((error = exec_shell_imgact(imgp)) == 0) {
+ char *rpath = NULL;
+
+ linux_emul_find(FIRST_THREAD_IN_PROC(imgp->proc), NULL,
+ imgp->interpreter_name, &rpath, 0);
+ if (rpath != imgp->interpreter_name) {
+ int len = strlen(rpath) + 1;
+
+ if (len <= MAXSHELLCMDLEN) {
+ memcpy(imgp->interpreter_name, rpath, len);
+ }
+ free(rpath, M_TEMP);
+ }
+ }
+ }
+ return(error);
+}
+
+/*
+ * Clear registers on exec
+ * XXX copied from ia32_signal.c.
+ */
+static void
+exec_linux_setregs(td, entry, stack, ps_strings)
+ struct thread *td;
+ u_long entry;
+ u_long stack;
+ u_long ps_strings;
+{
+ struct trapframe *regs = td->td_frame;
+ struct pcb *pcb = td->td_pcb;
+
+ wrmsr(MSR_FSBASE, 0);
+ wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */
+ pcb->pcb_fsbase = 0;
+ pcb->pcb_gsbase = 0;
+ load_ds(_udatasel);
+ load_es(_udatasel);
+ load_fs(_udatasel);
+ load_gs(0);
+ pcb->pcb_ds = _udatasel;
+ pcb->pcb_es = _udatasel;
+ pcb->pcb_fs = _udatasel;
+ pcb->pcb_gs = 0;
+
+ bzero((char *)regs, sizeof(struct trapframe));
+ regs->tf_rip = entry;
+ regs->tf_rsp = stack;
+ regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T);
+ regs->tf_ss = _udatasel;
+ regs->tf_cs = _ucode32sel;
+ regs->tf_rbx = ps_strings;
+ load_cr0(rcr0() | CR0_MP | CR0_TS);
+
+ /* Return via doreti so that we can change to a different %cs */
+ pcb->pcb_flags |= PCB_FULLCTX;
+ td->td_retval[1] = 0;
+}
+
+/*
+ * XXX copied from ia32_sysvec.c.
+ */
+static register_t *
+linux_copyout_strings(struct image_params *imgp)
+{
+ int argc, envc;
+ u_int32_t *vectp;
+ char *stringp, *destp;
+ u_int32_t *stack_base;
+ struct linux32_ps_strings *arginfo;
+ int sigcodesz;
+
+ /*
+ * Calculate string base and vector table pointers.
+ * Also deal with signal trampoline code for this exec type.
+ */
+ arginfo = (struct linux32_ps_strings *)LINUX32_PS_STRINGS;
+ sigcodesz = *(imgp->proc->p_sysent->sv_szsigcode);
+ destp = (caddr_t)arginfo - sigcodesz - SPARE_USRSPACE -
+ roundup((ARG_MAX - imgp->stringspace), sizeof(char *));
+
+ /*
+ * install sigcode
+ */
+ if (sigcodesz)
+ copyout(imgp->proc->p_sysent->sv_sigcode,
+ ((caddr_t)arginfo - sigcodesz), szsigcode);
+
+ /*
+ * If we have a valid auxargs ptr, prepare some room
+ * on the stack.
+ */
+ if (imgp->auxargs) {
+ /*
+ * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for
+ * lower compatibility.
+ */
+ imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size
+ : (AT_COUNT * 2);
+ /*
+ * The '+ 2' is for the null pointers at the end of each of
+ * the arg and env vector sets,and imgp->auxarg_size is room
+ * for argument of Runtime loader.
+ */
+ vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2 +
+ imgp->auxarg_size) * sizeof(u_int32_t));
+
+ } else
+ /*
+ * The '+ 2' is for the null pointers at the end of each of
+ * the arg and env vector sets
+ */
+ vectp = (u_int32_t *)
+ (destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t));
+
+ /*
+ * vectp also becomes our initial stack base
+ */
+ stack_base = vectp;
+
+ stringp = imgp->stringbase;
+ argc = imgp->argc;
+ envc = imgp->envc;
+ /*
+ * Copy out strings - arguments and environment.
+ */
+ copyout(stringp, destp, ARG_MAX - imgp->stringspace);
+
+ /*
+ * Fill in "ps_strings" struct for ps, w, etc.
+ */
+ suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp);
+ suword32(&arginfo->ps_nargvstr, argc);
+
+ /*
+ * Fill in argument portion of vector table.
+ */
+ for (; argc > 0; --argc) {
+ suword32(vectp++, (u_int32_t)(intptr_t)destp);
+ while (*stringp++ != 0)
+ destp++;
+ destp++;
+ }
+
+ /* a null vector table pointer separates the argp's from the envp's */
+ suword32(vectp++, 0);
+
+ suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp);
+ suword32(&arginfo->ps_nenvstr, envc);
+
+ /*
+ * Fill in environment portion of vector table.
+ */
+ for (; envc > 0; --envc) {
+ suword32(vectp++, (u_int32_t)(intptr_t)destp);
+ while (*stringp++ != 0)
+ destp++;
+ destp++;
+ }
+
+ /* end of vector table is a null pointer */
+ suword32(vectp, 0);
+
+ return ((register_t *)stack_base);
+}
+
+SYSCTL_NODE(_compat, OID_AUTO, linux32, CTLFLAG_RW, 0,
+ "32-bit Linux emulation");
+
+static u_long linux32_maxdsiz = LINUX32_MAXDSIZ;
+SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxdsiz, CTLFLAG_RW,
+ &linux32_maxdsiz, 0, "");
+static u_long linux32_maxssiz = LINUX32_MAXSSIZ;
+SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxssiz, CTLFLAG_RW,
+ &linux32_maxssiz, 0, "");
+static u_long linux32_maxvmem = LINUX32_MAXVMEM;
+SYSCTL_ULONG(_compat_linux32, OID_AUTO, maxvmem, CTLFLAG_RW,
+ &linux32_maxvmem, 0, "");
+
+/*
+ * XXX copied from ia32_sysvec.c.
+ */
+static void
+linux32_fixlimits(struct image_params *imgp)
+{
+ struct proc *p = imgp->proc;
+ struct plimit *oldlim, *newlim;
+
+ if (linux32_maxdsiz == 0 && linux32_maxssiz == 0 &&
+ linux32_maxvmem == 0)
+ return;
+ newlim = lim_alloc();
+ PROC_LOCK(p);
+ oldlim = p->p_limit;
+ lim_copy(newlim, oldlim);
+ if (linux32_maxdsiz != 0) {
+ if (newlim->pl_rlimit[RLIMIT_DATA].rlim_cur > linux32_maxdsiz)
+ newlim->pl_rlimit[RLIMIT_DATA].rlim_cur = linux32_maxdsiz;
+ if (newlim->pl_rlimit[RLIMIT_DATA].rlim_max > linux32_maxdsiz)
+ newlim->pl_rlimit[RLIMIT_DATA].rlim_max = linux32_maxdsiz;
+ }
+ if (linux32_maxssiz != 0) {
+ if (newlim->pl_rlimit[RLIMIT_STACK].rlim_cur > linux32_maxssiz)
+ newlim->pl_rlimit[RLIMIT_STACK].rlim_cur = linux32_maxssiz;
+ if (newlim->pl_rlimit[RLIMIT_STACK].rlim_max > linux32_maxssiz)
+ newlim->pl_rlimit[RLIMIT_STACK].rlim_max = linux32_maxssiz;
+ }
+ if (linux32_maxvmem != 0) {
+ if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur > linux32_maxvmem)
+ newlim->pl_rlimit[RLIMIT_VMEM].rlim_cur = linux32_maxvmem;
+ if (newlim->pl_rlimit[RLIMIT_VMEM].rlim_max > linux32_maxvmem)
+ newlim->pl_rlimit[RLIMIT_VMEM].rlim_max = linux32_maxvmem;
+ }
+ p->p_limit = newlim;
+ PROC_UNLOCK(p);
+ lim_free(oldlim);
+}
+
+struct sysentvec elf_linux_sysvec = {
+ LINUX_SYS_MAXSYSCALL,
+ linux_sysent,
+ 0xff,
+ LINUX_SIGTBLSZ,
+ bsd_to_linux_signal,
+ ELAST + 1,
+ bsd_to_linux_errno,
+ translate_traps,
+ elf_linux_fixup,
+ linux_sendsig,
+ linux_sigcode,
+ &linux_szsigcode,
+ linux_prepsyscall,
+ "Linux ELF32",
+ elf32_coredump,
+ exec_linux_imgact_try,
+ LINUX_MINSIGSTKSZ,
+ PAGE_SIZE,
+ VM_MIN_ADDRESS,
+ LINUX32_USRSTACK,
+ LINUX32_USRSTACK,
+ LINUX32_PS_STRINGS,
+ VM_PROT_ALL,
+ linux_copyout_strings,
+ exec_linux_setregs,
+ linux32_fixlimits
+};
+
+static Elf32_Brandinfo linux_brand = {
+ ELFOSABI_LINUX,
+ EM_386,
+ "Linux",
+ "/compat/linux",
+ "/lib/ld-linux.so.1",
+ &elf_linux_sysvec,
+ NULL,
+ };
+
+static Elf32_Brandinfo linux_glibc2brand = {
+ ELFOSABI_LINUX,
+ EM_386,
+ "Linux",
+ "/compat/linux",
+ "/lib/ld-linux.so.2",
+ &elf_linux_sysvec,
+ NULL,
+ };
+
+Elf32_Brandinfo *linux_brandlist[] = {
+ &linux_brand,
+ &linux_glibc2brand,
+ NULL
+ };
+
+static int
+linux_elf_modevent(module_t mod, int type, void *data)
+{
+ Elf32_Brandinfo **brandinfo;
+ int error;
+ struct linux_ioctl_handler **lihp;
+
+ error = 0;
+
+ switch(type) {
+ case MOD_LOAD:
+ for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
+ ++brandinfo)
+ if (elf32_insert_brand_entry(*brandinfo) < 0)
+ error = EINVAL;
+ if (error == 0) {
+ SET_FOREACH(lihp, linux_ioctl_handler_set)
+ linux_ioctl_register_handler(*lihp);
+ if (bootverbose)
+ printf("Linux ELF exec handler installed\n");
+ } else
+ printf("cannot insert Linux ELF brand handler\n");
+ break;
+ case MOD_UNLOAD:
+ for (brandinfo = &linux_brandlist[0]; *brandinfo != NULL;
+ ++brandinfo)
+ if (elf32_brand_inuse(*brandinfo))
+ error = EBUSY;
+ if (error == 0) {
+ for (brandinfo = &linux_brandlist[0];
+ *brandinfo != NULL; ++brandinfo)
+ if (elf32_remove_brand_entry(*brandinfo) < 0)
+ error = EINVAL;
+ }
+ if (error == 0) {
+ SET_FOREACH(lihp, linux_ioctl_handler_set)
+ linux_ioctl_unregister_handler(*lihp);
+ if (bootverbose)
+ printf("Linux ELF exec handler removed\n");
+ linux_mib_destroy();
+ } else
+ printf("Could not deinstall ELF interpreter entry\n");
+ break;
+ default:
+ break;
+ }
+ return error;
+}
+
+static moduledata_t linux_elf_mod = {
+ "linuxelf",
+ linux_elf_modevent,
+ 0
+};
+
+DECLARE_MODULE(linuxelf, linux_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);