/* $OpenBSD: kvm_sh.c,v 1.4 2012/07/09 08:43:10 deraadt Exp $ */ /* * Copyright (c) 2007 Miodrag Vallat. * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice, this permission notice, and the disclaimer below * appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include #include "kvm_private.h" #include #include #include #include void _kvm_freevtop(kvm_t *kd) { } int _kvm_initvtop(kvm_t *kd) { return (0); } /* * Translate a kernel virtual address to a physical address by walking * the kernels page table. */ /* Stolen from sys/arch/sh/include/pmap.h we can't really include */ #define __PMAP_PTP_N 512 /* # of page table page maps 2GB. */ /* Stolen from sys/arch/sh/sh/pmap.c */ #define __PMAP_PTP_SHIFT 22 #define __PMAP_PTP_PG_N (PAGE_SIZE / sizeof(pt_entry_t)) #define __PMAP_PTP_INDEX(va) (((va) >> __PMAP_PTP_SHIFT) & (__PMAP_PTP_N - 1)) #define __PMAP_PTP_OFSET(va) ((va >> PAGE_SHIFT) & (__PMAP_PTP_PG_N - 1)) int _kvm_kvatop(kvm_t *kd, u_long va, paddr_t *pa) { cpu_kcore_hdr_t *h = kd->cpu_data; u_int l1idx, l2idx; vaddr_t l2va; pt_entry_t l1pte, l2pte; off_t pteoffset; if (ISALIVE(kd)) { _kvm_err(kd, 0, "vatop called in live kernel!"); return (0); } /* * P1 and P2 segments addresses are trivial. */ if (va >= SH3_P1SEG_BASE && va <= SH3_P1SEG_END) { *pa = SH3_P1SEG_TO_PHYS(va); return (int)((vaddr_t)SH3_P1SEG_END + 1 - va); } if (va >= SH3_P2SEG_BASE && va <= SH3_P2SEG_END) { *pa = SH3_P2SEG_TO_PHYS(va); return (int)((vaddr_t)SH3_P2SEG_END + 1 - va); } /* * P3 segment addresses need kernel page table walk. */ if (va >= SH3_P3SEG_BASE && va < SH3_P3SEG_END) { l1idx = __PMAP_PTP_INDEX(va - VM_MIN_KERNEL_ADDRESS); l2idx = __PMAP_PTP_OFSET(va); /* read level 1 pte */ pteoffset = h->kcore_kptp + sizeof(pt_entry_t) * l1idx; if (_kvm_pread(kd, kd->pmfd, (char *)&l1pte, sizeof(l1pte), _kvm_pa2off(kd, pteoffset)) != sizeof(l1pte)) { _kvm_syserr(kd, 0, "could not read level 1 pte"); goto bad; } /* check pte for validity */ if ((l1pte & PG_V) == 0) { _kvm_err(kd, 0, "invalid level 1 pte: no valid bit"); goto bad; } l2va = l1pte & PG_PPN; if (l2va < SH3_P1SEG_BASE || l2va > SH3_P1SEG_END) { _kvm_err(kd, 0, "invalid level 1 pte: out of P1"); goto bad; } /* read level 2 pte */ pteoffset = SH3_P1SEG_TO_PHYS(l2va) + sizeof(pt_entry_t) * l2idx; if (_kvm_pread(kd, kd->pmfd, (char *)&l2pte, sizeof(l2pte), _kvm_pa2off(kd, pteoffset)) != sizeof(l2pte)) { _kvm_syserr(kd, 0, "could not read level 2 pte"); goto bad; } /* check pte for validity */ if ((l2pte & PG_V) == 0) { _kvm_err(kd, 0, "invalid level 2 pte: no valid bit"); goto bad; } *pa = (l2pte & PG_PPN) | (va & PAGE_MASK); return (PAGE_SIZE - (va & PAGE_MASK)); } /* * All other addresses are incorrect. */ _kvm_err(kd, 0, "not a kernel virtual address"); bad: *pa = (paddr_t)-1; return (0); } /* * Translate a physical address to a file offset in the crash dump. */ off_t _kvm_pa2off(kvm_t *kd, paddr_t pa) { cpu_kcore_hdr_t *h = kd->cpu_data; phys_ram_seg_t *seg = h->kcore_segs; off_t off = kd->dump_off; u_int i; for (i = h->kcore_nsegs; i != 0; i--) { if (pa >= seg->start && pa < seg->start + seg->size) return (off + (pa - seg->start)); off += seg->size; } _kvm_err(kd, 0, "physical address out of the image (%lx)", pa); return (0); }