diff options
Diffstat (limited to 'lib/libkvm/kvm_arm.c')
| -rw-r--r-- | lib/libkvm/kvm_arm.c | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_arm.c b/lib/libkvm/kvm_arm.c new file mode 100644 index 000000000000..b1e00bda7918 --- /dev/null +++ b/lib/libkvm/kvm_arm.c @@ -0,0 +1,277 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * 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. + * 3. 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/param.h> +#include <sys/endian.h> +#include <kvm.h> +#include <limits.h> +#include <stdint.h> +#include <stdlib.h> +#include <unistd.h> + +#ifdef __arm__ +#include <machine/vmparam.h> +#endif + +#include "kvm_private.h" +#include "kvm_arm.h" + +struct vmstate { + arm_pd_entry_t *l1pt; + size_t phnum; + GElf_Phdr *phdr; +}; + +/* + * 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) +{ + struct vmstate *vm = kd->vmst; + GElf_Phdr *p; + size_t n; + + p = vm->phdr; + n = vm->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))); +} + +static void +_arm_freevtop(kvm_t *kd) +{ + struct vmstate *vm = kd->vmst; + + free(vm->phdr); + free(vm); + kd->vmst = NULL; +} + +static int +_arm_probe(kvm_t *kd) +{ + + return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && + !_kvm_is_minidump(kd)); +} + +static int +_arm_initvtop(kvm_t *kd) +{ + struct vmstate *vm; + struct kvm_nlist nl[2]; + kvaddr_t kernbase; + arm_physaddr_t physaddr, pa; + arm_pd_entry_t *l1pt; + size_t i; + int found; + + if (kd->rawdump) { + _kvm_err(kd, kd->program, "raw dumps not supported on arm"); + return (-1); + } + + vm = _kvm_malloc(kd, sizeof(*vm)); + if (vm == NULL) { + _kvm_err(kd, kd->program, "cannot allocate vm"); + return (-1); + } + kd->vmst = vm; + vm->l1pt = NULL; + + if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1) + return (-1); + + found = 0; + for (i = 0; i < vm->phnum; i++) { + if (vm->phdr[i].p_type == PT_DUMP_DELTA) { + kernbase = vm->phdr[i].p_vaddr; + physaddr = vm->phdr[i].p_paddr; + found = 1; + break; + } + } + + nl[1].n_name = NULL; + if (!found) { + nl[0].n_name = "kernbase"; + if (kvm_nlist2(kd, nl) != 0) { +#ifdef __arm__ + kernbase = KERNBASE; +#else + _kvm_err(kd, kd->program, "cannot resolve kernbase"); + return (-1); +#endif + } else + kernbase = nl[0].n_value; + + nl[0].n_name = "physaddr"; + if (kvm_nlist2(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_nlist2(kd, nl) != 0) { + _kvm_err(kd, kd->program, "bad namelist"); + return (-1); + } + if (kvm_read2(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, ARM_L1_TABLE_SIZE); + if (l1pt == NULL) { + _kvm_err(kd, kd->program, "cannot allocate l1pt"); + return (-1); + } + if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_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 ARM_L1_IDX(va) ((va) >> ARM_L1_S_SHIFT) + +#define l1pte_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S) +#define l1pte_valid(pde) ((pde) != 0) +#define l2pte_valid(pte) ((pte) != 0) +#define l2pte_index(v) (((v) & ARM_L1_S_OFFSET) >> ARM_L2_S_SHIFT) + + +static int +_arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) +{ + struct vmstate *vm = kd->vmst; + arm_pd_entry_t pd; + arm_pt_entry_t pte; + arm_physaddr_t pte_pa; + off_t pte_off; + + if (vm->l1pt == NULL) + return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE)); + pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]); + if (!l1pte_valid(pd)) + goto invalid; + if (l1pte_section_p(pd)) { + /* 1MB section mapping. */ + *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET); + return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE)); + } + pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte); + _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE); + if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) { + _kvm_syserr(kd, kd->program, "_arm_kvatop: pread"); + goto invalid; + } + pte = _kvm32toh(kd, pte); + if (!l2pte_valid(pte)) { + goto invalid; + } + if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { + *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET); + return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE)); + } + *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET); + return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE)); +invalid: + _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)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 + +int +#ifdef __arm__ +_arm_native(kvm_t *kd) +#else +_arm_native(kvm_t *kd __unused) +#endif +{ + +#ifdef __arm__ +#if _BYTE_ORDER == _LITTLE_ENDIAN + return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2LSB); +#else + return (kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB); +#endif +#else + return (0); +#endif +} + +static struct kvm_arch kvm_arm = { + .ka_probe = _arm_probe, + .ka_initvtop = _arm_initvtop, + .ka_freevtop = _arm_freevtop, + .ka_kvatop = _arm_kvatop, + .ka_native = _arm_native, +}; + +KVM_ARCH(kvm_arm); |