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Differential D3341 Diff 7906 lib/libkvm/kvm_powerpc.c

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lib/libkvm/kvm_powerpc.c

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#include <sys/cdefs.h> #include <sys/cdefs.h>
__FBSDID("$FreeBSD$"); __FBSDID("$FreeBSD$");
#include <sys/param.h> #include <sys/param.h>
#include <sys/endian.h> #include <sys/endian.h>
#include <sys/kerneldump.h> #include <sys/kerneldump.h>
#include <sys/mman.h> #include <sys/mman.h>
#include <vm/vm.h>
#include <db.h>
#include <elf.h> #include <elf.h>
#include <limits.h>
#include <kvm.h> #include <kvm.h>
#include <limits.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include "kvm_private.h" #include "kvm_private.h"
struct vmstate { struct vmstate {
void *map; void *map;
size_t mapsz; size_t mapsz;
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static int static int
powerpc_maphdrs(kvm_t *kd) powerpc_maphdrs(kvm_t *kd)
{ {
struct vmstate *vm; struct vmstate *vm;
size_t mapsz; size_t mapsz;
vm = kd->vmst; vm = kd->vmst;
vm->mapsz = PAGE_SIZE; vm->mapsz = sizeof(*vm->eh) + sizeof(struct kerneldumpheader);
vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->map == MAP_FAILED) { if (vm->map == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot map corefile"); _kvm_err(kd, kd->program, "cannot map corefile");
return (-1); return (-1);
} }
vm->dmphdrsz = 0; vm->dmphdrsz = 0;
vm->eh = vm->map; vm->eh = vm->map;
if (!valid_elf_header(vm->eh)) { if (!valid_elf_header(vm->eh)) {
Show All 13 Linespowerpc_maphdrs(kvm_t *kd)
mapsz = be16toh(vm->eh->e_phentsize) * be16toh(vm->eh->e_phnum) + mapsz = be16toh(vm->eh->e_phentsize) * be16toh(vm->eh->e_phnum) +
be32toh(vm->eh->e_phoff); be32toh(vm->eh->e_phoff);
munmap(vm->map, vm->mapsz); munmap(vm->map, vm->mapsz);
/* Map all headers. */ /* Map all headers. */
vm->mapsz = vm->dmphdrsz + mapsz; vm->mapsz = vm->dmphdrsz + mapsz;
vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0); vm->map = mmap(NULL, vm->mapsz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
if (vm->map == MAP_FAILED) { if (vm->map == MAP_FAILED) {
_kvm_err(kd, kd->program, "cannot map corefle headers"); _kvm_err(kd, kd->program, "cannot map corefile headers");
return (-1); return (-1);
} }
vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz); vm->eh = (void *)((uintptr_t)vm->map + vm->dmphdrsz);
vm->ph = (void *)((uintptr_t)vm->eh + be32toh(vm->eh->e_phoff)); vm->ph = (void *)((uintptr_t)vm->eh + be32toh(vm->eh->e_phoff));
return (0); return (0);
inval: inval:
munmap(vm->map, vm->mapsz);
vm->map = MAP_FAILED;
_kvm_err(kd, kd->program, "invalid corefile"); _kvm_err(kd, kd->program, "invalid corefile");
return (-1); return (-1);
} }
/* /*
* Determine the offset within the corefile corresponding the virtual * Determine the offset within the corefile corresponding the virtual
* address. Return the number of contiguous bytes in the corefile or * address. Return the number of contiguous bytes in the corefile or
* 0 when the virtual address is invalid. * 0 when the virtual address is invalid.
*/ */
static size_t static size_t
powerpc_va2off(kvm_t *kd, u_long va, off_t *ofs) powerpc_va2off(kvm_t *kd, kvaddr_t va, off_t *ofs)
{ {
struct vmstate *vm = kd->vmst; struct vmstate *vm = kd->vmst;
Elf32_Phdr *ph; Elf32_Phdr *ph;
int nph; int nph;
ph = vm->ph; ph = vm->ph;
nph = be16toh(vm->eh->e_phnum); nph = be16toh(vm->eh->e_phnum);
while (nph && (va < be32toh(ph->p_vaddr) || while (nph && (va < be32toh(ph->p_vaddr) ||
va >= be32toh(ph->p_vaddr) + be32toh(ph->p_memsz))) { va >= be32toh(ph->p_vaddr) + be32toh(ph->p_memsz))) {
nph--; nph--;
ph = (void *)((uintptr_t)ph + be16toh(vm->eh->e_phentsize)); ph = (void *)((uintptr_t)ph + be16toh(vm->eh->e_phentsize));
} }
if (nph == 0) if (nph == 0)
return (0); return (0);
/* Segment found. Return file offset and range. */ /* Segment found. Return file offset and range. */
*ofs = vm->dmphdrsz + be32toh(ph->p_offset) + *ofs = vm->dmphdrsz + be32toh(ph->p_offset) +
(va - be32toh(ph->p_vaddr)); (va - be32toh(ph->p_vaddr));
return (be32toh(ph->p_memsz) - (va - be32toh(ph->p_vaddr))); return (be32toh(ph->p_memsz) - (va - be32toh(ph->p_vaddr)));
} }
void static void
_kvm_freevtop(kvm_t *kd) _powerpc_freevtop(kvm_t *kd)
{ {
struct vmstate *vm = kd->vmst; struct vmstate *vm = kd->vmst;
if (vm == NULL) if (vm->eh != MAP_FAILED)
return;
if (vm->eh != MAP_FAILED) {
munmap(vm->eh, vm->mapsz); munmap(vm->eh, vm->mapsz);
vm->eh = MAP_FAILED;
}
free(vm); free(vm);
kd->vmst = NULL; kd->vmst = NULL;
} }
int static int
_kvm_initvtop(kvm_t *kd) _powerpc_probe(kvm_t *kd)
{ {
return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_PPC) &&
kd->nlehdr.e_ident[EI_DATA] == ELFDATA2MSB);
}
static int
_powerpc_initvtop(kvm_t *kd)
{
kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst)); kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
if (kd->vmst == NULL) { if (kd->vmst == NULL)
_kvm_err(kd, kd->program, "out of virtual memory");
return (-1); return (-1);
}
if (powerpc_maphdrs(kd) == -1) { if (powerpc_maphdrs(kd) == -1)
free(kd->vmst);
kd->vmst = NULL;
return (-1); return (-1);
}
return (0); return (0);
} }
int static int
_kvm_kvatop(kvm_t *kd, u_long va, off_t *ofs) _powerpc_kvatop(kvm_t *kd, kvaddr_t va, off_t *ofs)
{ {
struct vmstate *vm; struct vmstate *vm;
vm = kd->vmst; vm = kd->vmst;
if (vm->ph->p_paddr == ~0U) if (be32toh(vm->ph->p_paddr) == 0xffffffff)
return ((int)powerpc_va2off(kd, va, ofs)); return ((int)powerpc_va2off(kd, va, ofs));
_kvm_err(kd, kd->program, "Raw corefile not supported"); _kvm_err(kd, kd->program, "Raw corefile not supported");
return (0); return (0);
} }
static int
_powerpc_native(kvm_t *kd)
{
#if defined(__powerpc__) && !defined(__powerpc64__)
return (1);
#else
return (0);
#endif
}
struct kvm_arch kvm_powerpc = {
.ka_probe = _powerpc_probe,
.ka_initvtop = _powerpc_initvtop,
.ka_freevtop = _powerpc_freevtop,
.ka_kvatop = _powerpc_kvatop,
.ka_native = _powerpc_native,
};
KVM_ARCH(kvm_powerpc);