X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6601e61aa18bf4f09af135ff61fc7f4771d23b06..e2fac8b15b12a7979f72090454d850e612fc5b13:/bsd/kern/kern_symfile.c diff --git a/bsd/kern/kern_symfile.c b/bsd/kern/kern_symfile.c index 1b5f11686..98e4e7771 100644 --- a/bsd/kern/kern_symfile.c +++ b/bsd/kern/kern_symfile.c @@ -1,48 +1,35 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * - * @APPLE_LICENSE_HEADER_START@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. + * This file contains Original Code and/or Modifications of Original Code + * as defined in and that are subject to the Apple Public Source License + * Version 2.0 (the 'License'). You may not use this file except in + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. * - * @APPLE_LICENSE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* Copyright (c) 1998 Apple Computer, Inc. All rights reserved. * * File: bsd/kern/kern_symfile.c * - * This file contains creates a dummy symbol file for mach_kernel - * based on the symbol table information passed by the - * SecondaryLoader/PlatformExpert. This allows us to correctly - * link other executables (drivers, etc) against the the kernel in - * cases where the kernel image on the root device does not match - * the live kernel. This can occur during net-booting where the - * actual kernel image is obtained from the network via tftp rather - * than the root device. - * - * If a symbol table is available, then the file /mach.sym will be - * created containing a Mach Header and a LC_SYMTAB load command - * followed by the the symbol table data for mach_kernel. - * - * NOTE: This file supports only 32 bit kernels at the present time; - * adding support for 64 bit kernels is possible, but is not - * necessary at the present time. - * * HISTORY - * - * . */ #include @@ -73,278 +60,19 @@ #include #include -extern unsigned char rootdevice[]; -extern struct mach_header _mh_execute_header; - -static int kernel_symfile_opened = 0; -static int error_code = 0; - -extern int IODTGetLoaderInfo(char *key, void **infoAddr, int *infoSize); -extern void IODTFreeLoaderInfo(char *key, void *infoAddr, int infoSize); - -/* - * Can only operate against currently running 32 bit mach_kernel +/* This function is called from kern_sysctl in the current process context; + * it is exported with the System6.0.exports, but this appears to be a legacy + * export, as there are no internal consumers. */ -static int -output_kernel_symbols(struct proc *p) -{ - struct vnode *vp; - kauth_cred_t cred = p->p_ucred; /* XXX */ - struct vnode_attr va; - struct vfs_context context; - struct load_command *cmd; - struct mach_header *orig_mh, *mh; - struct segment_command *orig_ds, *orig_ts, *orig_le, *sg; - struct section *se, *const_text; - struct symtab_command *st, *orig_st; - struct nlist *sym; - vm_size_t orig_mhsize, orig_st_size; - vm_offset_t header; - vm_size_t header_size = 0; /* out: protected by header */ - int error, error1; - unsigned int i, j; - caddr_t addr; - vm_offset_t offset; - int rc_mh, rc_sc; - - error = EFAULT; - - vp = NULL; - header = NULL; - orig_mh = NULL; - orig_st = NULL; - - // Dispose of unnecessary gumf, the booter doesn't need to load these - rc_mh = IODTGetLoaderInfo("Kernel-__HEADER", - (void **)&orig_mh, &orig_mhsize); - if (rc_mh == 0 && orig_mh) - IODTFreeLoaderInfo("Kernel-__HEADER", - (void *)orig_mh, round_page_32(orig_mhsize)); - - rc_sc = IODTGetLoaderInfo("Kernel-__SYMTAB", - (void **) &orig_st, &orig_st_size); - if (rc_sc == 0 && orig_st) - IODTFreeLoaderInfo("Kernel-__SYMTAB", - (void *)orig_st, round_page_32(orig_st_size)); - - if (cred->cr_svuid != cred->cr_ruid || cred->cr_svgid != cred->cr_rgid) - goto out; - - // Check to see if the root is 'e' or 'n', is this a test for network? - if (rootdevice[0] == 'e' && rootdevice[1] == 'n') - goto out; - - context.vc_proc = p; - context.vc_ucred = cred; - - if ((error = vnode_open("mach.sym", (O_CREAT | FWRITE), (S_IRUSR | S_IRGRP | S_IROTH), 0, &vp, &context))) - goto out; - - /* Don't dump to non-regular files or files with links. */ - error = EFAULT; - VATTR_INIT(&va); - VATTR_WANTED(&va, va_nlink); - if ((vp->v_type != VREG) || vnode_getattr(vp, &va, &context) || (va.va_nlink != 1)) - goto out; - - VATTR_INIT(&va); /* better to do it here than waste more stack in vnode_getsize */ - VATTR_SET(&va, va_data_size, 0); - vnode_setattr(vp, &va, &context); - p->p_acflag |= ACORE; - - // If the file type is MH_EXECUTE then this must be a kernel - // as all Kernel extensions must be of type MH_OBJECT - orig_ds = orig_ts = orig_le = NULL; - orig_st = NULL; - orig_mh = &_mh_execute_header; - cmd = (struct load_command *) &orig_mh[1]; - for (i = 0; i < orig_mh->ncmds; i++) { - if (cmd->cmd == LC_SEGMENT) { - struct segment_command *orig_sg = (struct segment_command *) cmd; - - if (!strcmp(SEG_TEXT, orig_sg->segname)) - orig_ts = orig_sg; - else if (!strcmp(SEG_DATA, orig_sg->segname)) - orig_ds = orig_sg; - else if (!strcmp(SEG_LINKEDIT, orig_sg->segname)) - orig_le = orig_sg; - } - else if (cmd->cmd == LC_SYMTAB) - orig_st = (struct symtab_command *) cmd; - - cmd = (struct load_command *) ((caddr_t) cmd + cmd->cmdsize); - } - - if (!orig_ts || !orig_ds || !orig_le || !orig_st) - goto out; - - const_text = NULL; - se = (struct section *) &orig_ts[1]; - for (i = 0; i < orig_ts->nsects; i++, se++) { - if (!strcmp("__const", se->sectname)) { - const_text = se; - break; - } - } - if (!const_text) - goto out; - - header_size = sizeof(struct mach_header) - + orig_ts->cmdsize - + orig_ds->cmdsize - + sizeof(struct symtab_command); - - (void) kmem_alloc(kernel_map, - (vm_offset_t *) &header, - (vm_size_t) header_size); - if (header) - bzero((void *) header, header_size); - else - goto out; - - /* - * Set up Mach-O header. - */ - mh = (struct mach_header *) header; - mh->magic = orig_mh->magic; - mh->cputype = orig_mh->cputype; - mh->cpusubtype = orig_mh->cpusubtype; - mh->filetype = orig_mh->filetype; - mh->ncmds = 3; - mh->sizeofcmds = header_size - sizeof(struct mach_header); - mh->flags = orig_mh->flags; - - // Initialise the current file offset and addr - offset = round_page(header_size); - addr = (caddr_t) const_text->addr; // Load address of __TEXT,__const - - /* - * Construct a TEXT segment load command - * the only part of the TEXT segment we keep is the __TEXT,__const - * which contains the kernel vtables. - */ - sg = (struct segment_command *) &mh[1]; - bcopy(orig_ts, sg, orig_ts->cmdsize); - sg->vmaddr = (unsigned long) addr; - sg->vmsize = const_text->size; - sg->fileoff = 0; - sg->filesize = const_text->size + round_page(header_size); - sg->maxprot = 0; - sg->initprot = 0; - sg->flags = 0; - se = (struct section *)(sg+1); - for ( j = 0; j < sg->nsects; j++, se++ ) { - se->addr = (unsigned long) addr; - se->size = 0; - se->offset = offset; - se->nreloc = 0; - if (!strcmp("__const", se->sectname)) { - se->size = const_text->size; - addr += const_text->size; - offset += const_text->size; - const_text = se; - } - } - offset = round_page(offset); - - // Now copy of the __DATA segment load command, the image need - // not be stored to disk nobody needs it, yet! - sg = (struct segment_command *)((int)sg + sg->cmdsize); - bcopy(orig_ds, sg, orig_ds->cmdsize); - - sg->vmaddr = (unsigned long) addr; - sg->vmsize = 0x1000; // One page for some reason? - sg->fileoff = offset; - sg->filesize = 0; - sg->maxprot = 0; - sg->initprot = 0; - sg->flags = 0; - se = (struct section *)(sg+1); - for ( j = 0; j < sg->nsects; j++, se++ ) { - se->addr = (unsigned long) addr; - se->size = 0; - se->offset = offset; - se->nreloc = 0; - } - offset = round_page(offset); - - - /* - * Set up LC_SYMTAB command - */ - st = (struct symtab_command *)((int)sg + sg->cmdsize); - st->cmd = LC_SYMTAB; - st->cmdsize = sizeof(struct symtab_command); - st->symoff = offset; - st->nsyms = orig_st->nsyms; - st->strsize = orig_st->strsize; - st->stroff = offset + st->nsyms * sizeof(struct nlist); - - /* - * Convert the symbol table in place from section references - * to absolute references. - */ - sym = (struct nlist *) orig_le->vmaddr; - for (i = 0; i < st->nsyms; i++, sym++ ) { - if ( (sym->n_type & N_TYPE) == N_SECT) { - sym->n_sect = NO_SECT; - sym->n_type = (sym->n_type & ~N_TYPE) | N_ABS; - } - } - - /* - * Write out the load commands at the beginning of the file. - */ - error = vn_rdwr(UIO_WRITE, vp, (caddr_t) mh, header_size, (off_t) 0, - UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p); - if (error) - goto out; - - /* - * Write out the __TEXT,__const data segment. - */ - error = vn_rdwr(UIO_WRITE, vp, (caddr_t) const_text->addr, - const_text->size, const_text->offset, - UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p); - if (error) - goto out; - - /* - * Write out kernel symbols - */ - offset = st->nsyms * sizeof(struct nlist) + st->strsize; // symtab size - error = vn_rdwr(UIO_WRITE, vp, - (caddr_t) orig_le->vmaddr, offset, st->symoff, - UIO_SYSSPACE32, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p); -out: - if (header) - kmem_free(kernel_map, header, header_size); - - if (vp) { - error1 = vnode_close(vp, FWRITE, &context); - if (!error) error = error1; - } - - return(error); -} -/* - * - */ -int get_kernel_symfile(struct proc *p, char **symfile) +int +get_kernel_symfile(__unused proc_t p, __unused char const **symfile) { - if (!kernel_symfile_opened) { - kernel_symfile_opened = 1; - error_code = output_kernel_symbols(p); - } - if (!error_code) - *symfile = "\\mach.sym"; - - return error_code; + return KERN_FAILURE; } struct kern_direct_file_io_ref_t { - struct vfs_context context; + vfs_context_t ctx; struct vnode *vp; }; @@ -372,8 +100,7 @@ kern_open_file_for_direct_io(const char * name, { struct kern_direct_file_io_ref_t * ref; - struct proc *p; - struct ucred *cred; + proc_t p; struct vnode_attr va; int error; off_t f_offset; @@ -397,11 +124,9 @@ kern_open_file_for_direct_io(const char * name, ref->vp = NULL; p = current_proc(); // kernproc; - cred = p->p_ucred; - ref->context.vc_proc = p; - ref->context.vc_ucred = cred; + ref->ctx = vfs_context_create(vfs_context_current()); - if ((error = vnode_open(name, (O_CREAT | FWRITE), (0), 0, &ref->vp, &ref->context))) + if ((error = vnode_open(name, (O_CREAT | FWRITE), (0), 0, &ref->vp, ref->ctx))) goto out; VATTR_INIT(&va); @@ -410,7 +135,7 @@ kern_open_file_for_direct_io(const char * name, VATTR_WANTED(&va, va_data_size); VATTR_WANTED(&va, va_nlink); error = EFAULT; - if (vnode_getattr(ref->vp, &va, &ref->context)) + if (vnode_getattr(ref->vp, &va, ref->ctx)) goto out; kprintf("vp va_rdev major %d minor %d\n", major(va.va_rdev), minor(va.va_rdev)); @@ -434,7 +159,7 @@ kern_open_file_for_direct_io(const char * name, device = va.va_rdev; p1 = ref->vp; - p2 = &ref->context; + p2 = ref->ctx; do_ioctl = &device_ioctl; } else @@ -537,10 +262,11 @@ out: if (error && ref) { if (ref->vp) { - vnode_close(ref->vp, FWRITE, &ref->context); - ref->vp = NULLVP; + vnode_close(ref->vp, FWRITE, ref->ctx); + ref->vp = NULLVP; } + vfs_context_rele(ref->ctx); kfree(ref, sizeof(struct kern_direct_file_io_ref_t)); ref = NULL; } @@ -554,7 +280,8 @@ kern_write_file(struct kern_direct_file_io_ref_t * ref, off_t offset, caddr_t ad return (vn_rdwr(UIO_WRITE, ref->vp, addr, len, offset, UIO_SYSSPACE32, IO_SYNC|IO_NODELOCKED|IO_UNIT, - ref->context.vc_ucred, (int *) 0, ref->context.vc_proc)); + vfs_context_ucred(ref->ctx), (int *) 0, + vfs_context_proc(ref->ctx))); } void @@ -566,10 +293,13 @@ kern_close_file_for_direct_io(struct kern_direct_file_io_ref_t * ref) int error; if (ref->vp) { - error = vnode_close(ref->vp, FWRITE, &ref->context); + error = vnode_close(ref->vp, FWRITE, ref->ctx); + ref->vp = NULLVP; kprintf("vnode_close(%d)\n", error); - ref->vp = NULLVP; } + vfs_context_rele(ref->ctx); + ref->ctx = NULL; kfree(ref, sizeof(struct kern_direct_file_io_ref_t)); } } +