diff options
author | Per Fogelstrom <pefo@cvs.openbsd.org> | 1996-05-02 08:21:04 +0000 |
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committer | Per Fogelstrom <pefo@cvs.openbsd.org> | 1996-05-02 08:21:04 +0000 |
commit | c9a852c396a31af0274a782511c1fbe37e9c7479 (patch) | |
tree | 604308e6af2ce982ebcb7266c6ffcce7c8a3d4c2 /sys/arch | |
parent | 69170ad0a923b4ef79e86fcfd09c0a3a37e684cb (diff) |
Temporary exec_elf.c overriding the one in kern until changes
merged with kern/exec_elf.c.
Diffstat (limited to 'sys/arch')
-rw-r--r-- | sys/arch/pica/pica/exec_elf.c | 630 |
1 files changed, 630 insertions, 0 deletions
diff --git a/sys/arch/pica/pica/exec_elf.c b/sys/arch/pica/pica/exec_elf.c new file mode 100644 index 00000000000..a934ab322ac --- /dev/null +++ b/sys/arch/pica/pica/exec_elf.c @@ -0,0 +1,630 @@ +/* $NetBSD: exec_elf.c,v 1.3 1995/09/16 00:28:08 thorpej Exp $ */ + +/* + * 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. + * + */ + +#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.h> +#include <sys/exec_elf.h> +#include <sys/syscall.h> +#include <sys/signalvar.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> + +#ifdef COMPAT_LINUX +#include <compat/linux/linux_exec.h> +#endif + +#ifdef COMPAT_SVR4 +#include <compat/svr4/svr4_exec.h> +#endif + +int (*elf_probe_funcs[])() = { +#ifdef COMPAT_SVR4 + svr4_elf_probe, +#endif +#ifdef COMPAT_LINUX + linux_elf_probe +#endif +}; + +static int elf_set_segment __P((struct exec_package *, u_long, u_long, + int)); +static int elf_read_from __P((struct proc *, struct vnode *, u_long, + caddr_t, int)); +static void elf_load_psection __P((struct exec_vmcmd_set *, + struct vnode *, Elf32_Phdr *, u_long *, u_long *, int *)); + +#define ELF_ALIGN(a, b) ((a) & ~((b) - 1)) + +/* + * This is the basic elf emul. + */ + +extern char sigcode[], esigcode[]; +#ifdef SYSCALL_DEBUG +extern char *syscallnames[]; +#endif + +struct emul emul_elf = { + "netbsd", + NULL, + sendsig, + SYS_syscall, + SYS_MAXSYSCALL, + sysent, +#ifdef SYSCALL_DEBUG + syscallnames, +#else + NULL, +#endif + sizeof(AuxInfo) * 8, + elf_copyargs, + setregs, + sigcode, + esigcode, +}; + +/* + * Copy arguments onto the stack in the normal way, but add some + * extra information in case of dynamic binding. + */ +void * +elf_copyargs(pack, arginfo, stack, argp) + struct exec_package *pack; + struct ps_strings *arginfo; + void *stack; + void *argp; +{ + char **cpp = stack; + char *dp, *sp; + size_t len; + void *nullp = NULL; + int argc = arginfo->ps_nargvstr; + int envc = arginfo->ps_nenvstr; + AuxInfo *a; + struct elf_args *ap; + + if (copyout(&argc, cpp++, sizeof(argc))) + return NULL; + + dp = (char *) (cpp + argc + envc + 2 + pack->ep_emul->e_arglen); + 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; + + 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; + + /* + * Push extra arguments on the stack needed by dynamically + * linked binaries + */ + a = (AuxInfo *) cpp; + if ((ap = (struct elf_args *) pack->ep_emul_arg)) { + + a->au_id = AUX_phdr; + a->au_v = ap->arg_phaddr; + a++; + + a->au_id = AUX_phent; + a->au_v = ap->arg_phentsize; + a++; + + a->au_id = AUX_phnum; + a->au_v = ap->arg_phnum; + a++; + + a->au_id = AUX_pagesz; + a->au_v = NBPG; + a++; + + a->au_id = AUX_base; + a->au_v = ap->arg_interp; + a++; + + a->au_id = AUX_flags; + a->au_v = 0; + a++; + + a->au_id = AUX_entry; + a->au_v = ap->arg_entry; + a++; + + a->au_id = AUX_null; + a->au_v = 0; + a++; + + free((char *) ap, M_TEMP); + } + return a; +} + +/* + * elf_check_header(): + * + * Check header for validity; return 0 of ok ENOEXEC if error + * + * XXX machine type needs to be moved to <machine/param.h> so + * just one comparison can be done. Unfortunately, there is both + * em_486 and em_386, so this would not work on the i386. + */ +int +elf_check_header(eh, type) + Elf32_Ehdr *eh; + int type; +{ + + if (bcmp(eh->e_ident, Elf32_e_ident, Elf32_e_siz) != 0) + return ENOEXEC; + + switch (eh->e_machine) { + /* XXX */ +#ifdef i386 + case Elf32_em_386: + case Elf32_em_486: +#endif +#ifdef sparc + case Elf32_em_sparc: +#endif +#ifdef mips + case Elf32_em_mips: +#endif + break; + + default: + return ENOEXEC; + } + + if (eh->e_type != type) + return ENOEXEC; + + return 0; +} + +/* + * elf_load_psection(): + * + * Load a psection at the appropriate address + */ +static void +elf_load_psection(vcset, vp, ph, addr, size, prot) + struct exec_vmcmd_set *vcset; + struct vnode *vp; + Elf32_Phdr *ph; + u_long *addr; + u_long *size; + int *prot; +{ + u_long uaddr, msize, psize, rm, rf; + long diff, offset; + + /* + * If the user specified an address, then we load there. + */ + if (*addr != ELF32_NO_ADDR) { + if (ph->p_align > 1) { + *addr = ELF_ALIGN(*addr + ph->p_align, ph->p_align); + uaddr = ELF_ALIGN(ph->p_vaddr, ph->p_align); + } else + uaddr = ph->p_vaddr; + diff = ph->p_vaddr - uaddr; + } else { + *addr = uaddr = ph->p_vaddr; + if (ph->p_align > 1) + *addr = ELF_ALIGN(uaddr, ph->p_align); + diff = uaddr - *addr; + } + + *prot |= (ph->p_flags & Elf32_pf_r) ? VM_PROT_READ : 0; + *prot |= (ph->p_flags & Elf32_pf_w) ? VM_PROT_WRITE : 0; + *prot |= (ph->p_flags & Elf32_pf_x) ? VM_PROT_EXECUTE : 0; + + offset = ph->p_offset - diff; + *size = ph->p_filesz + diff; + msize = ph->p_memsz + diff; + psize = round_page(*size); + + if(ph->p_flags & Elf32_pf_w) { + psize = trunc_page(*size); + NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset, *prot); + if(psize != *size) { + NEW_VMCMD(vcset, vmcmd_map_readvn, *size - psize, *addr + psize, vp, offset + psize, *prot); + } + } + else { + NEW_VMCMD(vcset, vmcmd_map_pagedvn, psize, *addr, vp, offset, *prot); + } + + /* + * Check if we need to extend the size of the segment + */ + rm = round_page(*addr + msize); + rf = round_page(*addr + *size); + + if (rm != rf) { + NEW_VMCMD(vcset, vmcmd_map_zero, rm - rf, rf, NULLVP, 0, *prot); + *size = msize; + } +} + +/* + * elf_set_segment(): + * + * Decide if the segment is text or data, depending on the protection + * and set it appropriately + */ +static int +elf_set_segment(epp, vaddr, size, prot) + struct exec_package *epp; + u_long vaddr; + u_long size; + int prot; +{ + /* + * Kludge: Unfortunately the current implementation of + * exec package assumes a single text and data segment. + * In Elf we can have more, but here we limit ourselves + * to two and hope :-( + * We also assume that the text is r-x, and data is rwx or rw-. + */ + switch (prot) { + case (VM_PROT_READ | VM_PROT_EXECUTE): + if (epp->ep_tsize != ELF32_NO_ADDR) + return ENOEXEC; + epp->ep_taddr = vaddr; + epp->ep_tsize = size; + break; + + case (VM_PROT_READ | VM_PROT_WRITE): + case (VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE): + if (epp->ep_dsize != ELF32_NO_ADDR) + return ENOEXEC; + epp->ep_daddr = vaddr; + epp->ep_dsize = size; + break; + + default: + return ENOEXEC; + } + return 0; +} + +/* + * elf_read_from(): + * + * Read from vnode into buffer at offset. + */ +static int +elf_read_from(p, vp, off, buf, size) + struct vnode *vp; + u_long off; + struct proc *p; + caddr_t buf; + int size; +{ + int error; + int resid; + + if ((error = vn_rdwr(UIO_READ, vp, buf, size, + off, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred, + &resid, p)) != 0) + return error; + /* + * See if we got all of it + */ + if (resid != 0) + return error; + return 0; +} + +/* + * elf_load_file(): + * + * Load a file (interpreter/library) pointed to by path + * [stolen from coff_load_shlib()]. Made slightly generic + * so it might be used externally. + */ +int +elf_load_file(p, path, vcset, entry, ap, last) + struct proc *p; + char *path; + struct exec_vmcmd_set *vcset; + u_long *entry; + struct elf_args *ap; + u_long *last; +{ + int error, i; + struct nameidata nd; + Elf32_Ehdr eh; + Elf32_Phdr *ph = NULL; + u_long phsize; + char *bp = NULL; + u_long addr = *last; + + bp = path; + /* + * 1. open file + * 2. read filehdr + * 3. map text, data, and bss out of it using VM_* + */ + NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, path, p); + if ((error = namei(&nd)) != 0) { + return error; + } + if ((error = elf_read_from(p, nd.ni_vp, 0, (caddr_t) &eh, + sizeof(eh))) != 0) + goto bad; + + if ((error = elf_check_header(&eh, Elf32_et_dyn)) != 0) + goto bad; + + phsize = eh.e_phnum * sizeof(Elf32_Phdr); + ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK); + + if ((error = elf_read_from(p, nd.ni_vp, eh.e_phoff, + (caddr_t) ph, phsize)) != 0) + goto bad; + + /* + * Load all the necessary sections + */ + for (i = 0; i < eh.e_phnum; i++) { + u_long size = 0; + int prot = 0; + + switch (ph[i].p_type) { + case Elf32_pt_load: + elf_load_psection(vcset, nd.ni_vp, &ph[i], &addr, + &size, &prot); + /* Assume that the text segment is r-x only */ + if ((prot & PROT_WRITE) == 0) { + *entry = addr + eh.e_entry - ph[i].p_vaddr; + ap->arg_interp = addr; + } + addr += size; + break; + + case Elf32_pt_dynamic: + case Elf32_pt_phdr: + case Elf32_pt_note: + break; + + default: + break; + } + } + +bad: + if (ph != NULL) + free((char *) ph, M_TEMP); + + *last = addr; + vrele(nd.ni_vp); + return error; +} + +/* + * exec_elf_makecmds(): Prepare an Elf binary's exec package + * + * First, set of the various offsets/lengths in the exec package. + * + * Then, mark the text image busy (so it can be demand paged) or error + * out if this is not possible. Finally, set up vmcmds for the + * text, data, bss, and stack segments. + * + */ +int +exec_elf_makecmds(p, epp) + struct proc *p; + struct exec_package *epp; +{ + Elf32_Ehdr *eh = epp->ep_hdr; + Elf32_Phdr *ph, *pp; + int error, i, n; + char interp[MAXPATHLEN]; + u_long pos = 0, phsize; + + if (epp->ep_hdrvalid < sizeof(Elf32_Ehdr)) + return ENOEXEC; + + if (elf_check_header(eh, Elf32_et_exec)) + return ENOEXEC; + + /* + * 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 (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; + } + /* + * Allocate space to hold all the program headers, and read them + * from the file + */ + phsize = eh->e_phnum * sizeof(Elf32_Phdr); + ph = (Elf32_Phdr *) malloc(phsize, M_TEMP, M_WAITOK); + + if ((error = elf_read_from(p, epp->ep_vp, eh->e_phoff, + (caddr_t) ph, phsize)) != 0) + goto bad; + + epp->ep_tsize = ELF32_NO_ADDR; + epp->ep_dsize = ELF32_NO_ADDR; + + interp[0] = '\0'; + + for (i = 0; i < eh->e_phnum; i++) { + pp = &ph[i]; + if (pp->p_type == Elf32_pt_interp) { + if (pp->p_filesz >= sizeof(interp)) + goto bad; + if ((error = elf_read_from(p, epp->ep_vp, pp->p_offset, + (caddr_t) interp, pp->p_filesz)) != 0) + goto bad; + break; + } + } + + /* + * OK, we want a slightly different twist of the + * standard emulation package for "real" elf. + */ + epp->ep_emul = &emul_elf; + pos = ELF32_NO_ADDR; + + /* + * On the same architecture, we may be emulating different systems. + * See which one will accept this executable. This currently only + * applies to Linux and SVR4 on the i386. + * + * Probe functions would normally see if the interpreter (if any) + * exists. Emulation packages may possibly replace the interpreter in + * interp[] with a changed path (/emul/xxx/<path>), and also + * set the ep_emul field in the exec package structure. + */ + if ((n = sizeof elf_probe_funcs / sizeof elf_probe_funcs[0])) { + error = ENOEXEC; + for (i = 0; i < n && error; i++) + error = elf_probe_funcs[i](p, epp, interp, &pos); + + if (error) + goto bad; + } + + /* + * Load all the necessary sections + */ + for (i = 0; i < eh->e_phnum; i++) { + u_long addr = ELF32_NO_ADDR, size = 0; + int prot = 0; + + pp = &ph[i]; + + switch (ph[i].p_type) { + case Elf32_pt_load: + elf_load_psection(&epp->ep_vmcmds, epp->ep_vp, + &ph[i], &addr, &size, &prot); + if ((error = elf_set_segment(epp, addr, size, + prot)) != 0) + goto bad; + break; + + case Elf32_pt_shlib: + error = ENOEXEC; + goto bad; + + case Elf32_pt_interp: + /* Already did this one */ + case Elf32_pt_dynamic: + case Elf32_pt_phdr: + case Elf32_pt_note: + break; + + default: + /* + * Not fatal, we don't need to understand everything + * :-) + */ + break; + } + } + + /* + * Check if we found a dynamically linked binary and arrange to load + * it's interpreter + */ + if (interp[0]) { + struct elf_args *ap; + + ap = (struct elf_args *) malloc(sizeof(struct elf_args), + M_TEMP, M_WAITOK); + if ((error = elf_load_file(p, interp, &epp->ep_vmcmds, + &epp->ep_entry, ap, &pos)) != 0) { + free((char *) ap, M_TEMP); + goto bad; + } + /* Arrange to load the program headers. */ + pos = ELF_ALIGN(pos + NBPG, NBPG); + ap->arg_phaddr = pos; + NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, phsize, + pos, epp->ep_vp, eh->e_phoff, + VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE); + pos += phsize; + + ap->arg_phentsize = eh->e_phentsize; + ap->arg_phnum = eh->e_phnum; + ap->arg_entry = eh->e_entry; + + epp->ep_emul_arg = ap; + } else + epp->ep_entry = eh->e_entry; + + free((char *) ph, M_TEMP); + epp->ep_vp->v_flag |= VTEXT; + return exec_aout_setup_stack(p, epp); + +bad: + free((char *) ph, M_TEMP); + kill_vmcmds(&epp->ep_vmcmds); + return ENOEXEC; +} |