Changeset View
Changeset View
Standalone View
Standalone View
lib/libkvm/kvm_arm.c
Show All 33 Lines | |||||
/* | /* | ||||
* ARM machine dependent routines for kvm. | * ARM machine dependent routines for kvm. | ||||
*/ | */ | ||||
#include <sys/cdefs.h> | #include <sys/cdefs.h> | ||||
__FBSDID("$FreeBSD$"); | __FBSDID("$FreeBSD$"); | ||||
#include <sys/param.h> | #include <sys/param.h> | ||||
#include <sys/elf32.h> | #include <sys/endian.h> | ||||
#include <sys/mman.h> | |||||
#ifndef CROSS_LIBKVM | |||||
#include <vm/vm.h> | |||||
#include <vm/vm_param.h> | |||||
#include <vm/pmap.h> | |||||
#include <machine/pmap.h> | |||||
#else | |||||
#include "../../sys/arm/include/pte.h" | |||||
#include "../../sys/arm/include/vmparam.h" | |||||
#endif | |||||
#include <db.h> | |||||
#include <limits.h> | |||||
#include <kvm.h> | #include <kvm.h> | ||||
#include <limits.h> | |||||
#include <stdint.h> | |||||
#include <stdlib.h> | #include <stdlib.h> | ||||
#include <string.h> | |||||
#include <unistd.h> | #include <unistd.h> | ||||
#ifdef __arm__ | |||||
#include <machine/vmparam.h> | |||||
#endif | |||||
#include "kvm_private.h" | #include "kvm_private.h" | ||||
#include "kvm_arm.h" | |||||
/* minidump must be the first item! */ | |||||
struct vmstate { | struct vmstate { | ||||
int minidump; /* 1 = minidump mode */ | arm_pd_entry_t *l1pt; | ||||
pd_entry_t *l1pt; | size_t phnum; | ||||
void *mmapbase; | GElf_Phdr *phdr; | ||||
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. | * Translate a physical memory address to a file-offset in the crash-dump. | ||||
*/ | */ | ||||
static size_t | static size_t | ||||
_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) | _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz) | ||||
{ | { | ||||
Elf32_Ehdr *e = kd->vmst->mmapbase; | struct vmstate *vm = kd->vmst; | ||||
Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff); | GElf_Phdr *p; | ||||
int n = e->e_phnum; | size_t n; | ||||
p = vm->phdr; | |||||
n = vm->phnum; | |||||
while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) | while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz)) | ||||
p++, n--; | p++, n--; | ||||
if (n == 0) | if (n == 0) | ||||
return (0); | return (0); | ||||
*ofs = (pa - p->p_paddr) + p->p_offset; | *ofs = (pa - p->p_paddr) + p->p_offset; | ||||
if (pgsz == 0) | if (pgsz == 0) | ||||
return (p->p_memsz - (pa - p->p_paddr)); | return (p->p_memsz - (pa - p->p_paddr)); | ||||
return (pgsz - ((size_t)pa & (pgsz - 1))); | return (pgsz - ((size_t)pa & (pgsz - 1))); | ||||
} | } | ||||
void | static void | ||||
_kvm_freevtop(kvm_t *kd) | _arm_freevtop(kvm_t *kd) | ||||
{ | { | ||||
if (kd->vmst != 0) { | struct vmstate *vm = kd->vmst; | ||||
if (kd->vmst->minidump) | |||||
return (_kvm_minidump_freevtop(kd)); | free(vm->phdr); | ||||
if (kd->vmst->mmapbase != NULL) | free(vm); | ||||
munmap(kd->vmst->mmapbase, kd->vmst->mmapsize); | |||||
free(kd->vmst); | |||||
kd->vmst = NULL; | kd->vmst = NULL; | ||||
} | } | ||||
static int | |||||
_arm_probe(kvm_t *kd) | |||||
{ | |||||
return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_ARM) && | |||||
!_kvm_is_minidump(kd)); | |||||
} | } | ||||
int | static int | ||||
_kvm_initvtop(kvm_t *kd) | _arm_initvtop(kvm_t *kd) | ||||
{ | { | ||||
struct vmstate *vm; | struct vmstate *vm; | ||||
struct nlist nl[2]; | struct kvm_nlist nl[2]; | ||||
u_long kernbase, physaddr, pa; | kvaddr_t kernbase; | ||||
pd_entry_t *l1pt; | arm_physaddr_t physaddr, pa; | ||||
Elf32_Ehdr *ehdr; | arm_pd_entry_t *l1pt; | ||||
Elf32_Phdr *phdr; | size_t i; | ||||
size_t hdrsz; | int found; | ||||
char minihdr[8]; | |||||
int found, i; | |||||
if (!kd->rawdump) { | if (kd->rawdump) { | ||||
if (pread(kd->pmfd, &minihdr, 8, 0) == 8) { | _kvm_err(kd, kd->program, "raw dumps not supported on arm"); | ||||
if (memcmp(&minihdr, "minidump", 8) == 0) | |||||
return (_kvm_minidump_initvtop(kd)); | |||||
} else { | |||||
_kvm_err(kd, kd->program, "cannot read header"); | |||||
return (-1); | return (-1); | ||||
} | } | ||||
} | |||||
vm = _kvm_malloc(kd, sizeof(*vm)); | vm = _kvm_malloc(kd, sizeof(*vm)); | ||||
if (vm == 0) { | if (vm == 0) { | ||||
_kvm_err(kd, kd->program, "cannot allocate vm"); | _kvm_err(kd, kd->program, "cannot allocate vm"); | ||||
return (-1); | return (-1); | ||||
} | } | ||||
kd->vmst = vm; | kd->vmst = vm; | ||||
vm->l1pt = NULL; | vm->l1pt = NULL; | ||||
if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1) | |||||
if (_kvm_read_core_phdrs(kd, &vm->phnum, &vm->phdr) == -1) | |||||
return (-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); | |||||
phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff); | |||||
found = 0; | found = 0; | ||||
for (i = 0; i < ehdr->e_phnum; i++) { | for (i = 0; i < vm->phnum; i++) { | ||||
if (phdr[i].p_type == PT_DUMP_DELTA) { | if (vm->phdr[i].p_type == PT_DUMP_DELTA) { | ||||
kernbase = phdr[i].p_vaddr; | kernbase = vm->phdr[i].p_vaddr; | ||||
physaddr = phdr[i].p_paddr; | physaddr = vm->phdr[i].p_paddr; | ||||
found = 1; | found = 1; | ||||
break; | break; | ||||
} | } | ||||
} | } | ||||
nl[1].n_name = NULL; | nl[1].n_name = NULL; | ||||
if (!found) { | if (!found) { | ||||
nl[0].n_name = "kernbase"; | nl[0].n_name = "kernbase"; | ||||
if (kvm_nlist(kd, nl) != 0) | if (kvm_nlist2(kd, nl) != 0) { | ||||
#ifdef __arm__ | |||||
kernbase = KERNBASE; | kernbase = KERNBASE; | ||||
else | #else | ||||
_kvm_err(kd, kd->program, "cannot resolve kernbase"); | |||||
return (-1); | |||||
#endif | |||||
} else | |||||
kernbase = nl[0].n_value; | kernbase = nl[0].n_value; | ||||
nl[0].n_name = "physaddr"; | nl[0].n_name = "physaddr"; | ||||
if (kvm_nlist(kd, nl) != 0) { | if (kvm_nlist2(kd, nl) != 0) { | ||||
_kvm_err(kd, kd->program, "couldn't get phys addr"); | _kvm_err(kd, kd->program, "couldn't get phys addr"); | ||||
return (-1); | return (-1); | ||||
} | } | ||||
physaddr = nl[0].n_value; | physaddr = nl[0].n_value; | ||||
} | } | ||||
nl[0].n_name = "kernel_l1pa"; | nl[0].n_name = "kernel_l1pa"; | ||||
if (kvm_nlist(kd, nl) != 0) { | if (kvm_nlist2(kd, nl) != 0) { | ||||
_kvm_err(kd, kd->program, "bad namelist"); | _kvm_err(kd, kd->program, "bad namelist"); | ||||
return (-1); | return (-1); | ||||
} | } | ||||
if (kvm_read(kd, (nl[0].n_value - kernbase + physaddr), &pa, | if (kvm_read2(kd, (nl[0].n_value - kernbase + physaddr), &pa, | ||||
sizeof(pa)) != sizeof(pa)) { | sizeof(pa)) != sizeof(pa)) { | ||||
_kvm_err(kd, kd->program, "cannot read kernel_l1pa"); | _kvm_err(kd, kd->program, "cannot read kernel_l1pa"); | ||||
return (-1); | return (-1); | ||||
} | } | ||||
l1pt = _kvm_malloc(kd, L1_TABLE_SIZE); | l1pt = _kvm_malloc(kd, ARM_L1_TABLE_SIZE); | ||||
if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) { | if (kvm_read2(kd, pa, l1pt, ARM_L1_TABLE_SIZE) != ARM_L1_TABLE_SIZE) { | ||||
_kvm_err(kd, kd->program, "cannot read l1pt"); | _kvm_err(kd, kd->program, "cannot read l1pt"); | ||||
free(l1pt); | free(l1pt); | ||||
return (-1); | return (-1); | ||||
} | } | ||||
vm->l1pt = l1pt; | vm->l1pt = l1pt; | ||||
return 0; | return 0; | ||||
} | } | ||||
/* from arm/pmap.c */ | /* from arm/pmap.c */ | ||||
#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT) | #define ARM_L1_IDX(va) ((va) >> ARM_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_section_p(pde) (((pde) & ARM_L1_TYPE_MASK) == ARM_L1_TYPE_S) | ||||
#define l1pte_valid(pde) ((pde) != 0) | #define l1pte_valid(pde) ((pde) != 0) | ||||
#define l2pte_valid(pte) ((pte) != 0) | #define l2pte_valid(pte) ((pte) != 0) | ||||
#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT) | #define l2pte_index(v) (((v) & ARM_L2_ADDR_BITS) >> ARM_L2_S_SHIFT) | ||||
int | static int | ||||
_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa) | _arm_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa) | ||||
{ | { | ||||
struct vmstate *vm = kd->vmst; | struct vmstate *vm = kd->vmst; | ||||
pd_entry_t pd; | arm_pd_entry_t pd; | ||||
pt_entry_t pte; | arm_pt_entry_t pte; | ||||
off_t pte_pa; | arm_physaddr_t pte_pa; | ||||
off_t pte_off; | |||||
if (kd->vmst->minidump) | |||||
return (_kvm_minidump_kvatop(kd, va, pa)); | |||||
if (vm->l1pt == NULL) | if (vm->l1pt == NULL) | ||||
return (_kvm_pa2off(kd, va, pa, PAGE_SIZE)); | return (_kvm_pa2off(kd, va, pa, ARM_PAGE_SIZE)); | ||||
pd = vm->l1pt[L1_IDX(va)]; | pd = _kvm32toh(kd, vm->l1pt[ARM_L1_IDX(va)]); | ||||
if (!l1pte_valid(pd)) | if (!l1pte_valid(pd)) | ||||
goto invalid; | goto invalid; | ||||
if (l1pte_section_p(pd)) { | if (l1pte_section_p(pd)) { | ||||
/* 1MB section mapping. */ | /* 1MB section mapping. */ | ||||
*pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET); | *pa = (pd & ARM_L1_S_ADDR_MASK) + (va & ARM_L1_S_OFFSET); | ||||
return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE)); | return (_kvm_pa2off(kd, *pa, pa, ARM_L1_S_SIZE)); | ||||
} | } | ||||
pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte); | pte_pa = (pd & ARM_L1_C_ADDR_MASK) + l2pte_index(va) * sizeof(pte); | ||||
_kvm_pa2off(kd, pte_pa, &pte_pa, L1_S_SIZE); | _kvm_pa2off(kd, pte_pa, &pte_off, ARM_L1_S_SIZE); | ||||
if (lseek(kd->pmfd, pte_pa, 0) == -1) { | if (pread(kd->pmfd, &pte, sizeof(pte), pte_off) != sizeof(pte)) { | ||||
_kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek"); | _kvm_syserr(kd, kd->program, "_arm_kvatop: pread"); | ||||
goto invalid; | goto invalid; | ||||
} | } | ||||
if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) { | pte = _kvm32toh(kd, pte); | ||||
_kvm_syserr(kd, kd->program, "_kvm_kvatop: read"); | |||||
goto invalid; | |||||
} | |||||
if (!l2pte_valid(pte)) { | if (!l2pte_valid(pte)) { | ||||
goto invalid; | goto invalid; | ||||
} | } | ||||
if ((pte & L2_TYPE_MASK) == L2_TYPE_L) { | if ((pte & ARM_L2_TYPE_MASK) == ARM_L2_TYPE_L) { | ||||
*pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET); | *pa = (pte & ARM_L2_L_FRAME) | (va & ARM_L2_L_OFFSET); | ||||
return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE)); | return (_kvm_pa2off(kd, *pa, pa, ARM_L2_L_SIZE)); | ||||
} | } | ||||
*pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET); | *pa = (pte & ARM_L2_S_FRAME) | (va & ARM_L2_S_OFFSET); | ||||
return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE)); | return (_kvm_pa2off(kd, *pa, pa, ARM_PAGE_SIZE)); | ||||
invalid: | invalid: | ||||
_kvm_err(kd, 0, "Invalid address (%lx)", va); | _kvm_err(kd, 0, "Invalid address (%jx)", (uintmax_t)va); | ||||
return 0; | return 0; | ||||
} | } | ||||
/* | /* | ||||
* Machine-dependent initialization for ALL open kvm descriptors, | * Machine-dependent initialization for ALL open kvm descriptors, | ||||
* not just those for a kernel crash dump. Some architectures | * not just those for a kernel crash dump. Some architectures | ||||
* have to deal with these NOT being constants! (i.e. m68k) | * have to deal with these NOT being constants! (i.e. m68k) | ||||
*/ | */ | ||||
#ifdef FBSD_NOT_YET | #ifdef FBSD_NOT_YET | ||||
int | int | ||||
_kvm_mdopen(kvm_t *kd) | _kvm_mdopen(kvm_t *kd) | ||||
{ | { | ||||
kd->usrstack = USRSTACK; | kd->usrstack = USRSTACK; | ||||
kd->min_uva = VM_MIN_ADDRESS; | kd->min_uva = VM_MIN_ADDRESS; | ||||
kd->max_uva = VM_MAXUSER_ADDRESS; | kd->max_uva = VM_MAXUSER_ADDRESS; | ||||
return (0); | return (0); | ||||
} | } | ||||
#endif | #endif | ||||
int | |||||
_arm_native(kvm_t *kd) | |||||
{ | |||||
#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 | |||||
} | |||||
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); |