diff options
Diffstat (limited to 'lib/libkvm/kvm_arm.c')
-rw-r--r-- | lib/libkvm/kvm_arm.c | 266 |
1 files changed, 266 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_arm.c b/lib/libkvm/kvm_arm.c new file mode 100644 index 0000000..b1274e9 --- /dev/null +++ b/lib/libkvm/kvm_arm.c @@ -0,0 +1,266 @@ +/*- + * Copyright (c) 2005 Olivier Houchard + * Copyright (c) 1989, 1992, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software developed by the Computer Systems + * Engineering group at Lawrence Berkeley Laboratory under DARPA contract + * BG 91-66 and contributed to Berkeley. + * + * 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. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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. + */ + +/* + * ARM machine dependent routines for kvm. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/elf32.h> +#include <sys/mman.h> + +#include <vm/vm.h> +#include <vm/vm_param.h> +#include <vm/pmap.h> + +#include <machine/pmap.h> + +#include <db.h> +#include <limits.h> +#include <kvm.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include "kvm_private.h" + +/* minidump must be the first item! */ +struct vmstate { + int minidump; /* 1 = minidump mode */ + pd_entry_t *l1pt; + void *mmapbase; + size_t mmapsize; +}; + +static int +_kvm_maphdrs(kvm_t *kd, size_t sz) +{ + struct vmstate *vm = kd->vmst; + + /* munmap() previous mmap(). */ + if (vm->mmapbase != NULL) { + munmap(vm->mmapbase, vm->mmapsize); + vm->mmapbase = NULL; + } + + vm->mmapsize = sz; + vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); + if (vm->mmapbase == MAP_FAILED) { + _kvm_err(kd, kd->program, "cannot mmap corefile"); + return (-1); + } + + return (0); +} + +/* + * Translate a physical memory address to a file-offset in the crash-dump. + */ +static size_t +_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) +{ + Elf32_Ehdr *e = kd->vmst->mmapbase; + Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff); + int n = e->e_phnum; + + while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) + p++, n--; + if (n == 0) + return (0); + + *ofs = (pa - p->p_paddr) + p->p_offset; + if (pgsz == 0) + return (p->p_memsz - (pa - p->p_paddr)); + return (pgsz - ((size_t)pa & (pgsz - 1))); +} + +void +_kvm_freevtop(kvm_t *kd) +{ + if (kd->vmst != 0) { + if (kd->vmst->minidump) + return (_kvm_minidump_freevtop(kd)); + if (kd->vmst->mmapbase != NULL) + munmap(kd->vmst->mmapbase, kd->vmst->mmapsize); + free(kd->vmst); + kd->vmst = NULL; + } +} + +int +_kvm_initvtop(kvm_t *kd) +{ + struct vmstate *vm; + struct nlist nl[2]; + u_long kernbase, physaddr, pa; + pd_entry_t *l1pt; + Elf32_Ehdr *ehdr; + size_t hdrsz; + char minihdr[8]; + + if (!kd->rawdump) { + if (pread(kd->pmfd, &minihdr, 8, 0) == 8) { + if (memcmp(&minihdr, "minidump", 8) == 0) + return (_kvm_minidump_initvtop(kd)); + } else { + _kvm_err(kd, kd->program, "cannot read header"); + return (-1); + } + } + + vm = _kvm_malloc(kd, sizeof(*vm)); + if (vm == 0) { + _kvm_err(kd, kd->program, "cannot allocate vm"); + return (-1); + } + kd->vmst = vm; + vm->l1pt = NULL; + if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1) + return (-1); + ehdr = kd->vmst->mmapbase; + hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum; + if (_kvm_maphdrs(kd, hdrsz) == -1) + return (-1); + nl[0].n_name = "kernbase"; + nl[1].n_name = NULL; + if (kvm_nlist(kd, nl) != 0) + kernbase = KERNBASE; + else + kernbase = nl[0].n_value; + + nl[0].n_name = "physaddr"; + if (kvm_nlist(kd, nl) != 0) { + _kvm_err(kd, kd->program, "couldn't get phys addr"); + return (-1); + } + physaddr = nl[0].n_value; + nl[0].n_name = "kernel_l1pa"; + if (kvm_nlist(kd, nl) != 0) { + _kvm_err(kd, kd->program, "bad namelist"); + return (-1); + } + if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa, + sizeof(pa)) != sizeof(pa)) { + _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); + return (-1); + } + l1pt = _kvm_malloc(kd, L1_TABLE_SIZE); + if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) { + _kvm_err(kd, kd->program, "cannot read l1pt"); + free(l1pt); + return (-1); + } + vm->l1pt = l1pt; + return 0; +} + +/* from arm/pmap.c */ +#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT) +/* from arm/pmap.h */ +#define L1_TYPE_INV 0x00 /* Invalid (fault) */ +#define L1_TYPE_C 0x01 /* Coarse L2 */ +#define L1_TYPE_S 0x02 /* Section */ +#define L1_TYPE_F 0x03 /* Fine L2 */ +#define L1_TYPE_MASK 0x03 /* mask of type bits */ + +#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S) +#define l1pte_valid(pde) ((pde) != 0) +#define l2pte_valid(pte) ((pte) != 0) +#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT) + + +int +_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) +{ + struct vmstate *vm = kd->vmst; + pd_entry_t pd; + pt_entry_t pte; + u_long pte_pa; + + if (kd->vmst->minidump) + return (_kvm_minidump_kvatop(kd, va, pa)); + + if (vm->l1pt == NULL) + return (_kvm_pa2off(kd, va, pa, PAGE_SIZE)); + pd = vm->l1pt[L1_IDX(va)]; + if (!l1pte_valid(pd)) + goto invalid; + if (l1pte_section_p(pd)) { + /* 1MB section mapping. */ + *pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET); + return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE)); + } + pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte); + _kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE); + if (lseek(kd->pmfd, pte_pa, 0) == -1) { + _kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek"); + goto invalid; + } + if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) { + _kvm_syserr(kd, kd->program, "_kvm_kvatop: read"); + goto invalid; + } + if (!l2pte_valid(pte)) { + goto invalid; + } + if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { + *pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); + return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE)); + } + *pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); + return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE)); +invalid: + _kvm_err(kd, 0, "Invalid address (%lx)", va); + return 0; +} + +/* + * Machine-dependent initialization for ALL open kvm descriptors, + * not just those for a kernel crash dump. Some architectures + * have to deal with these NOT being constants! (i.e. m68k) + */ +#ifdef FBSD_NOT_YET +int +_kvm_mdopen(kvm_t *kd) +{ + + kd->usrstack = USRSTACK; + kd->min_uva = VM_MIN_ADDRESS; + kd->max_uva = VM_MAXUSER_ADDRESS; + + return (0); +} +#endif |