initial import of NetBSD tree

1 files changed, 502 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_exec.c b/sys/compat/linux/linux_exec.c
new file mode 100644
index 00000000000..cc266db42bd
--- /dev/null
+++ b/sys/compat/linux/linux_exec.c
@@ -0,0 +1,502 @@
+/*	$NetBSD: linux_exec.c,v 1.12 1995/10/07 06:27:00 mycroft Exp $	*/
+
+/*
+ * Copyright (c) 1995 Frank van der Linden
+ * Copyright (c) 1994 Christos Zoulas
+ * 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.
+ * 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.
+ *
+ * based on exec_aout.c, sunos_exec.c and svr4_exec.c
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/proc.h>
+#include <sys/malloc.h>
+#include <sys/namei.h>
+#include <sys/vnode.h>
+#include <sys/exec_elf.h>
+
+#include <sys/mman.h>
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/vm_map.h>
+
+#include <machine/cpu.h>
+#include <machine/reg.h>
+#include <machine/exec.h>
+#include <machine/linux_machdep.h>
+
+#include <compat/linux/linux_types.h>
+#include <compat/linux/linux_syscall.h>
+#include <compat/linux/linux_signal.h>
+#include <compat/linux/linux_syscallargs.h>
+#include <compat/linux/linux_util.h>
+#include <compat/linux/linux_exec.h>
+
+static void *linux_aout_copyargs __P((struct exec_package *,
+	struct ps_strings *, void *, void *));
+
+#define	LINUX_AOUT_AUX_ARGSIZ	2
+#define LINUX_ELF_AUX_ARGSIZ (sizeof(AuxInfo) * 8 / sizeof(char *))
+
+
+const char linux_emul_path[] = "/emul/linux";
+extern int linux_error[];
+extern char linux_sigcode[], linux_esigcode[];
+extern struct sysent linux_sysent[];
+extern char *linux_syscallnames[];
+
+struct emul emul_linux_aout = {
+	"linux",
+	linux_error,
+	linux_sendsig,
+	LINUX_SYS_syscall,
+	LINUX_SYS_MAXSYSCALL,
+	linux_sysent,
+	linux_syscallnames,
+	LINUX_AOUT_AUX_ARGSIZ,
+	linux_aout_copyargs,
+	setregs,
+	linux_sigcode,
+	linux_esigcode,
+};
+
+struct emul emul_linux_elf = {
+	"linux",
+	linux_error,
+	linux_sendsig,
+	LINUX_SYS_syscall,
+	LINUX_SYS_MAXSYSCALL,
+	linux_sysent,
+	linux_syscallnames,
+	LINUX_ELF_AUX_ARGSIZ,
+	elf_copyargs,
+	setregs,
+	linux_sigcode,
+	linux_esigcode,
+};
+
+
+static void *
+linux_aout_copyargs(pack, arginfo, stack, argp)
+	struct exec_package *pack;
+	struct ps_strings *arginfo;
+	void *stack;
+	void *argp;
+{
+	char **cpp = stack;
+	char **stk = stack;
+	char *dp, *sp;
+	size_t len;
+	void *nullp = NULL;
+	int argc = arginfo->ps_nargvstr;
+	int envc = arginfo->ps_nenvstr;
+
+	if (copyout(&argc, cpp++, sizeof(argc)))
+		return NULL;
+
+	/* leave room for envp and argv */
+	cpp += 2;
+	if (copyout(&cpp, &stk[1], sizeof (cpp)))
+		return NULL;
+
+	dp = (char *) (cpp + argc + envc + 2);
+	sp = argp;
+
+	/* XXX don't copy them out, remap them! */
+	arginfo->ps_argvstr = cpp; /* remember location of argv for later */
+
+	for (; --argc >= 0; sp += len, dp += len)
+		if (copyout(&dp, cpp++, sizeof(dp)) ||
+		    copyoutstr(sp, dp, ARG_MAX, &len))
+			return NULL;
+
+	if (copyout(&nullp, cpp++, sizeof(nullp)))
+		return NULL;
+
+	if (copyout(&cpp, &stk[2], sizeof (cpp)))
+		return NULL;
+
+	arginfo->ps_envstr = cpp; /* remember location of envp for later */
+
+	for (; --envc >= 0; sp += len, dp += len)
+		if (copyout(&dp, cpp++, sizeof(dp)) ||
+		    copyoutstr(sp, dp, ARG_MAX, &len))
+			return NULL;
+
+	if (copyout(&nullp, cpp++, sizeof(nullp)))
+		return NULL;
+
+	return cpp;
+}
+
+int
+exec_linux_aout_makecmds(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *linux_ep = epp->ep_hdr;
+	int machtype, magic;
+	int error = ENOEXEC;
+
+	magic = LINUX_N_MAGIC(linux_ep);
+	machtype = LINUX_N_MACHTYPE(linux_ep);
+
+
+	if (machtype != LINUX_MID_MACHINE)
+		return (ENOEXEC);
+
+	switch (magic) {
+	case QMAGIC:
+		error = exec_linux_aout_prep_qmagic(p, epp);
+		break;
+	case ZMAGIC:
+		error = exec_linux_aout_prep_zmagic(p, epp);
+		break;
+	case NMAGIC:
+		error = exec_linux_aout_prep_nmagic(p, epp);
+		break;
+	case OMAGIC:
+		error = exec_linux_aout_prep_omagic(p, epp);
+		break;
+	}
+	if (error == 0)
+		epp->ep_emul = &emul_linux_aout;
+	return error;
+}
+
+/*
+ * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
+ * is very likely not page aligned on most architectures, it is treated
+ * as an NMAGIC here. XXX
+ */
+
+int
+exec_linux_aout_prep_zmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+
+	epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/* set up command for text segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
+	    epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
+	    VM_PROT_READ|VM_PROT_EXECUTE);
+
+	/* set up command for data segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
+	    epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
+	    epp->ep_daddr + execp->a_data, NULLVP, 0,
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	return exec_aout_setup_stack(p, epp);
+}
+
+/*
+ * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
+ * Not different from the normal stuff.
+ */
+
+int
+exec_linux_aout_prep_nmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+	long bsize, baddr;
+
+	epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/* set up command for text segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
+	    epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
+	    VM_PROT_READ|VM_PROT_EXECUTE);
+
+	/* set up command for data segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
+	    epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
+	bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+	if (bsize > 0)
+		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+		    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	return exec_aout_setup_stack(p, epp);
+}
+
+/*
+ * exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
+ * Business as usual.
+ */
+
+int
+exec_linux_aout_prep_omagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+	long dsize, bsize, baddr;
+
+	epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/* set up command for text and data segments */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
+	    execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
+	    LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	baddr = roundup(epp->ep_daddr + execp->a_data, NBPG);
+	bsize = epp->ep_daddr + epp->ep_dsize - baddr;
+	if (bsize > 0)
+		NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
+		    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/*
+	 * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
+	 * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
+	 * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
+	 * respectively to page boundaries.
+	 * Compensate `ep_dsize' for the amount of data covered by the last
+	 * text page. 
+	 */
+	dsize = epp->ep_dsize + execp->a_text - roundup(execp->a_text, NBPG);
+	epp->ep_dsize = (dsize > 0) ? dsize : 0;
+	return exec_aout_setup_stack(p, epp);
+}
+
+int
+exec_linux_aout_prep_qmagic(p, epp)
+	struct proc *p;
+	struct exec_package *epp;
+{
+	struct exec *execp = epp->ep_hdr;
+
+	epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
+	epp->ep_tsize = execp->a_text;
+	epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
+	epp->ep_dsize = execp->a_data + execp->a_bss;
+	epp->ep_entry = execp->a_entry;
+
+	/*
+	 * check if vnode is in open for writing, because we want to
+	 * demand-page out of it.  if it is, don't do it, for various
+	 * reasons
+	 */
+	if ((execp->a_text != 0 || execp->a_data != 0) &&
+	    epp->ep_vp->v_writecount != 0) {
+#ifdef DIAGNOSTIC
+		if (epp->ep_vp->v_flag & VTEXT)
+			panic("exec: a VTEXT vnode has writecount != 0\n");
+#endif
+		return ETXTBSY;
+	}
+	epp->ep_vp->v_flag |= VTEXT;
+
+	/* set up command for text segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
+	    epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
+	    VM_PROT_READ|VM_PROT_EXECUTE);
+
+	/* set up command for data segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
+	    epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	/* set up command for bss segment */
+	NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
+	    epp->ep_daddr + execp->a_data, NULLVP, 0,
+	    VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+
+	return exec_aout_setup_stack(p, epp);
+}
+
+int
+linux_elf_probe(p, epp, itp, pos)
+	struct proc *p;
+	struct exec_package *epp;
+	char *itp;
+	u_long *pos;
+{
+	char *bp;
+	int error;
+	size_t len;
+
+	if (itp[0]) {
+		if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0)))
+			return error;
+		if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
+			return error;
+		free(bp, M_TEMP);
+	}
+	epp->ep_emul = &emul_linux_elf;
+	*pos = ELF32_NO_ADDR;
+	return 0;
+}
+
+/*
+ * The Linux system call to load shared libraries, a.out version. The
+ * a.out shared libs are just files that are mapped onto a fixed
+ * address in the process' address space. The address is given in
+ * a_entry. Read in the header, set up some VM commands and run them.
+ *
+ * Yes, both text and data are mapped at once, so we're left with
+ * writeable text for the shared libs. The Linux crt0 seemed to break
+ * sometimes when data was mapped seperately. It munmapped a uselib()
+ * of ld.so by hand, which failed with shared text and data for ld.so
+ * Yuck.
+ *
+ * Because of the problem with ZMAGIC executables (text starts
+ * at 0x400 in the file, but needs to be mapped at 0), ZMAGIC
+ * shared libs are not handled very efficiently :-(
+ */
+
+int
+linux_sys_uselib(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_uselib_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	caddr_t sg;
+	long bsize, dsize, tsize, taddr, baddr, daddr;
+	struct nameidata ni;
+	struct vnode *vp;
+	struct exec hdr;
+	struct exec_vmcmd_set vcset;
+	int rem, i, magic, error;
+
+	sg = stackgap_init(p->p_emul);
+	LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
+
+	NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+
+	if ((error = namei(&ni)))
+		return error;
+
+	vp = ni.ni_vp;
+
+	if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
+			     0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
+			     &rem, p))) {
+		vrele(vp);
+		return error;
+	}
+
+	if (rem != 0) {
+		vrele(vp);
+		return ENOEXEC;
+	}
+
+	if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE)
+		return ENOEXEC;
+
+	magic = LINUX_N_MAGIC(&hdr);
+	taddr = hdr.a_entry & (~(NBPG - 1));
+	tsize = hdr.a_text;
+	daddr = taddr + tsize;
+	dsize = hdr.a_data + hdr.a_bss;
+
+	if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
+		vrele(vp);
+                return ETXTBSY;
+        }
+	vp->v_flag |= VTEXT;
+
+	vcset.evs_cnt = 0;
+	vcset.evs_used = 0;
+
+	NEW_VMCMD(&vcset,
+		  magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
+		  hdr.a_text + hdr.a_data, taddr,
+		  vp, LINUX_N_TXTOFF(hdr, magic),
+		  VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
+
+	baddr = roundup(daddr + hdr.a_data, NBPG);
+	bsize = daddr + dsize - baddr;
+        if (bsize > 0) {
+                NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
+                    NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
+	}
+
+	for (i = 0; i < vcset.evs_used && !error; i++) {
+		struct exec_vmcmd *vcp;
+
+		vcp = &vcset.evs_cmds[i];
+		error = (*vcp->ev_proc)(p, vcp);
+	}
+
+	kill_vmcmds(&vcset);
+
+	vrele(vp);
+
+	return error;
+}
+
+/*
+ * Execve(2). Just check the alternate emulation path, and pass it on
+ * to the NetBSD execve().
+ */
+int
+linux_sys_execve(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct linux_sys_execve_args /* {
+		syscallarg(char *) path;
+		syscallarg(char **) argv;
+		syscallarg(char **) envp;
+	} */ *uap = v;
+	caddr_t sg;
+
+	sg = stackgap_init(p->p_emul);
+	LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
+
+	return sys_execve(p, uap, retval);
+}