diff options
Diffstat (limited to 'lib/libkvm/kvm_ia64.c')
| -rw-r--r-- | lib/libkvm/kvm_ia64.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/lib/libkvm/kvm_ia64.c b/lib/libkvm/kvm_ia64.c new file mode 100644 index 0000000..fbee551 --- /dev/null +++ b/lib/libkvm/kvm_ia64.c @@ -0,0 +1,209 @@ +/* $FreeBSD$ */ +/* $NetBSD: kvm_alpha.c,v 1.7.2.1 1997/11/02 20:34:26 mellon Exp $ */ + +/* + * Copyright (c) 1994, 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Chris G. Demetriou + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +#include <sys/types.h> +#include <sys/elf64.h> +#include <sys/mman.h> + +#include <machine/pte.h> + +#include <kvm.h> +#include <limits.h> +#include <stdlib.h> +#include <unistd.h> + +#include "kvm_private.h" + +#define REGION_BASE(n) (((uint64_t)(n)) << 61) +#define REGION_ADDR(x) ((x) & ((1LL<<61)-1LL)) + +#define NKPTEPG(ps) ((ps) / sizeof(struct ia64_lpte)) +#define KPTE_PTE_INDEX(va,ps) (((va)/(ps)) % NKPTEPG(ps)) +#define KPTE_DIR_INDEX(va,ps) (((va)/(ps)) / NKPTEPG(ps)) + +struct vmstate { + void *mmapbase; + size_t mmapsize; + size_t pagesize; + u_long kptdir; +}; + +/* + * Map the ELF headers into the process' address space. We do this in two + * steps: first the ELF header itself and using that information the whole + * set of headers. + */ +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) +{ + Elf64_Ehdr *e = kd->vmst->mmapbase; + Elf64_Phdr *p = (Elf64_Phdr*)((char*)e + e->e_phoff); + int n = e->e_phnum; + + if (pa != REGION_ADDR(pa)) { + _kvm_err(kd, kd->program, "internal error"); + return (0); + } + + 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) +{ + struct vmstate *vm = kd->vmst; + + if (vm->mmapbase != NULL) + munmap(vm->mmapbase, vm->mmapsize); + free(vm); + kd->vmst = NULL; +} + +int +_kvm_initvtop(kvm_t *kd) +{ + struct nlist nlist[2]; + uint64_t va; + Elf64_Ehdr *ehdr; + size_t hdrsz; + + kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); + if (kd->vmst == NULL) { + _kvm_err(kd, kd->program, "cannot allocate vm"); + return (-1); + } + + kd->vmst->pagesize = getpagesize(); + + if (_kvm_maphdrs(kd, sizeof(Elf64_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); + + /* + * At this point we've got enough information to use kvm_read() for + * direct mapped (ie region 6 and region 7) address, such as symbol + * addresses/values. + */ + + nlist[0].n_name = "ia64_kptdir"; + nlist[1].n_name = 0; + + if (kvm_nlist(kd, nlist) != 0) { + _kvm_err(kd, kd->program, "bad namelist"); + return (-1); + } + + if (kvm_read(kd, (nlist[0].n_value), &va, sizeof(va)) != sizeof(va)) { + _kvm_err(kd, kd->program, "cannot read kptdir"); + return (-1); + } + + if (va < REGION_BASE(6)) { + _kvm_err(kd, kd->program, "kptdir is itself virtual"); + return (-1); + } + + kd->vmst->kptdir = va; + return (0); +} + +int +_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) +{ + struct ia64_lpte pte; + uint64_t pgaddr, ptaddr; + size_t pgno, pgsz, ptno; + + if (va >= REGION_BASE(6)) { + /* Regions 6 and 7: direct mapped. */ + return (_kvm_pa2off(kd, REGION_ADDR(va), pa, 0)); + } else if (va >= REGION_BASE(5)) { + /* Region 5: virtual. */ + va = REGION_ADDR(va); + pgsz = kd->vmst->pagesize; + ptno = KPTE_DIR_INDEX(va, pgsz); + pgno = KPTE_PTE_INDEX(va, pgsz); + if (ptno >= (pgsz >> 3)) + goto fail; + ptaddr = kd->vmst->kptdir + (ptno << 3); + if (kvm_read(kd, ptaddr, &pgaddr, 8) != 8) + goto fail; + if (pgaddr == 0) + goto fail; + pgaddr += (pgno * sizeof(pte)); + if (kvm_read(kd, pgaddr, &pte, sizeof(pte)) != sizeof(pte)) + goto fail; + if (!(pte.pte & PTE_PRESENT)) + goto fail; + va = (pte.pte & PTE_PPN_MASK) + (va & (pgsz - 1)); + return (_kvm_pa2off(kd, va, pa, pgsz)); + } + + fail: + _kvm_err(kd, kd->program, "invalid kernel virtual address"); + *pa = ~0UL; + return (0); +} |
