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authorJohn Baldwin <jhb@FreeBSD.org>2015-11-27 18:58:26 +0000
committerJohn Baldwin <jhb@FreeBSD.org>2015-11-27 18:58:26 +0000
commit7f911abe54fff2adbb0dfea5a7fd8e81117d6527 (patch)
tree0b881610c55721cfde72c0eaeb1df3d9d654fd26 /lib/libkvm/kvm_i386.c
parent6a5289b068f192ee653ce6304683d0f6588f8e0e (diff)
Notes
Diffstat (limited to 'lib/libkvm/kvm_i386.c')
-rw-r--r--lib/libkvm/kvm_i386.c358
1 files changed, 164 insertions, 194 deletions
diff --git a/lib/libkvm/kvm_i386.c b/lib/libkvm/kvm_i386.c
index ca61a97d120f3..f37da2630e1d0 100644
--- a/lib/libkvm/kvm_i386.c
+++ b/lib/libkvm/kvm_i386.c
@@ -46,171 +46,133 @@ static char sccsid[] = "@(#)kvm_hp300.c 8.1 (Berkeley) 6/4/93";
*/
#include <sys/param.h>
-#include <sys/user.h>
-#include <sys/proc.h>
-#include <sys/stat.h>
-#include <sys/mman.h>
+#include <sys/endian.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
-#include <nlist.h>
#include <kvm.h>
-#include <vm/vm.h>
-#include <vm/vm_param.h>
-
-#include <machine/elf.h>
+#ifdef __i386__
+#include <machine/vmparam.h> /* For KERNBASE. */
+#endif
#include <limits.h>
#include "kvm_private.h"
+#include "kvm_i386.h"
-#ifndef btop
-#define btop(x) (i386_btop(x))
-#define ptob(x) (i386_ptob(x))
-#endif
-
-#define PG_FRAME_PAE (~((uint64_t)PAGE_MASK))
-#define PDRSHIFT_PAE 21
-#define NPTEPG_PAE (PAGE_SIZE/sizeof(uint64_t))
-#define NBPDR_PAE (1<<PDRSHIFT_PAE)
-
-/* minidump must be the first item! */
struct vmstate {
- int minidump; /* 1 = minidump mode */
- void *mmapbase;
- size_t mmapsize;
void *PTD;
int pae;
+ size_t phnum;
+ GElf_Phdr *phdr;
};
/*
- * 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)
{
- Elf_Ehdr *e = kd->vmst->mmapbase;
- Elf_Phdr *p;
- int n;
+ struct vmstate *vm = kd->vmst;
+ GElf_Phdr *p;
+ size_t n;
if (kd->rawdump) {
*ofs = pa;
- return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
+ return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
}
- p = (Elf_Phdr*)((char*)e + e->e_phoff);
- n = e->e_phnum;
+ 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;
- return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
+ return (I386_PAGE_SIZE - (pa & I386_PAGE_MASK));
}
-void
-_kvm_freevtop(kvm_t *kd)
+static void
+_i386_freevtop(kvm_t *kd)
{
struct vmstate *vm = kd->vmst;
- if (kd->vmst->minidump)
- return (_kvm_minidump_freevtop(kd));
- if (vm->mmapbase != NULL)
- munmap(vm->mmapbase, vm->mmapsize);
if (vm->PTD)
free(vm->PTD);
+ free(vm->phdr);
free(vm);
kd->vmst = NULL;
}
-int
-_kvm_initvtop(kvm_t *kd)
+static int
+_i386_probe(kvm_t *kd)
{
- struct nlist nl[2];
- u_long pa;
- u_long kernbase;
+
+ return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
+ !_kvm_is_minidump(kd));
+}
+
+static int
+_i386_initvtop(kvm_t *kd)
+{
+ struct kvm_nlist nl[2];
+ i386_physaddr_t pa;
+ kvaddr_t kernbase;
char *PTD;
- Elf_Ehdr *ehdr;
- size_t hdrsz;
int i;
- char minihdr[8];
-
- if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8)
- if (memcmp(&minihdr, "minidump", 8) == 0)
- return (_kvm_minidump_initvtop(kd));
- kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
- if (kd->vmst == 0) {
+ kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(struct vmstate));
+ if (kd->vmst == NULL) {
_kvm_err(kd, kd->program, "cannot allocate vm");
return (-1);
}
kd->vmst->PTD = 0;
if (kd->rawdump == 0) {
- if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
- return (-1);
-
- ehdr = kd->vmst->mmapbase;
- hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
- if (_kvm_maphdrs(kd, hdrsz) == -1)
+ if (_kvm_read_core_phdrs(kd, &kd->vmst->phnum,
+ &kd->vmst->phdr) == -1)
return (-1);
}
nl[0].n_name = "kernbase";
nl[1].n_name = 0;
- if (kvm_nlist(kd, nl) != 0)
+ if (kvm_nlist2(kd, nl) != 0) {
+#ifdef __i386__
kernbase = KERNBASE; /* for old kernels */
- else
+#else
+ _kvm_err(kd, kd->program, "cannot resolve kernbase");
+ return (-1);
+#endif
+ } else
kernbase = nl[0].n_value;
nl[0].n_name = "IdlePDPT";
nl[1].n_name = 0;
- if (kvm_nlist(kd, nl) == 0) {
- uint64_t pa64;
+ if (kvm_nlist2(kd, nl) == 0) {
+ i386_physaddr_pae_t pa64;
- if (kvm_read(kd, (nl[0].n_value - kernbase), &pa,
+ if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read IdlePDPT");
return (-1);
}
- PTD = _kvm_malloc(kd, 4 * PAGE_SIZE);
+ pa = le32toh(pa);
+ PTD = _kvm_malloc(kd, 4 * I386_PAGE_SIZE);
for (i = 0; i < 4; i++) {
- if (kvm_read(kd, pa + (i * sizeof(pa64)), &pa64,
+ if (kvm_read2(kd, pa + (i * sizeof(pa64)), &pa64,
sizeof(pa64)) != sizeof(pa64)) {
_kvm_err(kd, kd->program, "Cannot read PDPT");
free(PTD);
return (-1);
}
- if (kvm_read(kd, pa64 & PG_FRAME_PAE,
- PTD + (i * PAGE_SIZE), PAGE_SIZE) != (PAGE_SIZE)) {
+ pa64 = le64toh(pa64);
+ if (kvm_read2(kd, pa64 & I386_PG_FRAME_PAE,
+ PTD + (i * I386_PAGE_SIZE), I386_PAGE_SIZE) !=
+ I386_PAGE_SIZE) {
_kvm_err(kd, kd->program, "cannot read PDPT");
free(PTD);
return (-1);
@@ -222,17 +184,18 @@ _kvm_initvtop(kvm_t *kd)
nl[0].n_name = "IdlePTD";
nl[1].n_name = 0;
- if (kvm_nlist(kd, nl) != 0) {
+ if (kvm_nlist2(kd, nl) != 0) {
_kvm_err(kd, kd->program, "bad namelist");
return (-1);
}
- if (kvm_read(kd, (nl[0].n_value - kernbase), &pa,
+ if (kvm_read2(kd, (nl[0].n_value - kernbase), &pa,
sizeof(pa)) != sizeof(pa)) {
_kvm_err(kd, kd->program, "cannot read IdlePTD");
return (-1);
}
- PTD = _kvm_malloc(kd, PAGE_SIZE);
- if (kvm_read(kd, pa, PTD, PAGE_SIZE) != PAGE_SIZE) {
+ pa = le32toh(pa);
+ PTD = _kvm_malloc(kd, I386_PAGE_SIZE);
+ if (kvm_read2(kd, pa, PTD, I386_PAGE_SIZE) != I386_PAGE_SIZE) {
_kvm_err(kd, kd->program, "cannot read PTD");
return (-1);
}
@@ -243,24 +206,23 @@ _kvm_initvtop(kvm_t *kd)
}
static int
-_kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
+_i386_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
struct vmstate *vm;
- u_long offset;
- u_long pte_pa;
- u_long pde_pa;
- pd_entry_t pde;
- pt_entry_t pte;
- u_long pdeindex;
- u_long pteindex;
+ i386_physaddr_t offset;
+ i386_physaddr_t pte_pa;
+ i386_pde_t pde;
+ i386_pte_t pte;
+ kvaddr_t pdeindex;
+ kvaddr_t pteindex;
size_t s;
- u_long a;
+ i386_physaddr_t a;
off_t ofs;
- uint32_t *PTD;
+ i386_pde_t *PTD;
vm = kd->vmst;
- PTD = (uint32_t *)vm->PTD;
- offset = va & (PAGE_SIZE - 1);
+ PTD = (i386_pde_t *)vm->PTD;
+ offset = va & I386_PAGE_MASK;
/*
* If we are initializing (kernel page table descriptor pointer
@@ -270,93 +232,87 @@ _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
s = _kvm_pa2off(kd, va, pa);
if (s == 0) {
_kvm_err(kd, kd->program,
- "_kvm_vatop: bootstrap data not in dump");
+ "_i386_vatop: bootstrap data not in dump");
goto invalid;
} else
- return (PAGE_SIZE - offset);
+ return (I386_PAGE_SIZE - offset);
}
- pdeindex = va >> PDRSHIFT;
- pde = PTD[pdeindex];
- if (((u_long)pde & PG_V) == 0) {
- _kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
+ pdeindex = va >> I386_PDRSHIFT;
+ pde = le32toh(PTD[pdeindex]);
+ if ((pde & I386_PG_V) == 0) {
+ _kvm_err(kd, kd->program, "_i386_vatop: pde not valid");
goto invalid;
}
- if ((u_long)pde & PG_PS) {
- /*
- * No second-level page table; ptd describes one 4MB page.
- * (We assume that the kernel wouldn't set PG_PS without enabling
- * it cr0).
- */
-#define PAGE4M_MASK (NBPDR - 1)
-#define PG_FRAME4M (~PAGE4M_MASK)
- pde_pa = ((u_long)pde & PG_FRAME4M) + (va & PAGE4M_MASK);
- s = _kvm_pa2off(kd, pde_pa, &ofs);
+ if (pde & I386_PG_PS) {
+ /*
+ * No second-level page table; ptd describes one 4MB
+ * page. (We assume that the kernel wouldn't set
+ * PG_PS without enabling it cr0).
+ */
+ offset = va & I386_PAGE_PS_MASK;
+ a = (pde & I386_PG_PS_FRAME) + offset;
+ s = _kvm_pa2off(kd, a, pa);
if (s == 0) {
_kvm_err(kd, kd->program,
- "_kvm_vatop: 4MB page address not in dump");
+ "_i386_vatop: 4MB page address not in dump");
goto invalid;
}
- *pa = ofs;
- return (NBPDR - (va & PAGE4M_MASK));
+ return (I386_NBPDR - offset);
}
- pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
- pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pde));
+ pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG - 1);
+ pte_pa = (pde & I386_PG_FRAME) + (pteindex * sizeof(pte));
s = _kvm_pa2off(kd, pte_pa, &ofs);
- if (s < sizeof pte) {
- _kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
+ if (s < sizeof(pte)) {
+ _kvm_err(kd, kd->program, "_i386_vatop: pte_pa not found");
goto invalid;
}
/* XXX This has to be a physical address read, kvm_read is virtual */
- if (lseek(kd->pmfd, ofs, 0) == -1) {
- _kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
- goto invalid;
- }
- if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
- _kvm_syserr(kd, kd->program, "_kvm_vatop: read");
+ if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
+ _kvm_syserr(kd, kd->program, "_i386_vatop: pread");
goto invalid;
}
- if (((u_long)pte & PG_V) == 0) {
+ pte = le32toh(pte);
+ if ((pte & I386_PG_V) == 0) {
_kvm_err(kd, kd->program, "_kvm_kvatop: pte not valid");
goto invalid;
}
- a = ((u_long)pte & PG_FRAME) + offset;
- s =_kvm_pa2off(kd, a, pa);
+ a = (pte & I386_PG_FRAME) + offset;
+ s = _kvm_pa2off(kd, a, pa);
if (s == 0) {
- _kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
+ _kvm_err(kd, kd->program, "_i386_vatop: address not in dump");
goto invalid;
} else
- return (PAGE_SIZE - offset);
+ return (I386_PAGE_SIZE - offset);
invalid:
- _kvm_err(kd, 0, "invalid address (0x%lx)", va);
+ _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0);
}
static int
-_kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
+_i386_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
{
struct vmstate *vm;
- uint64_t offset;
- uint64_t pte_pa;
- uint64_t pde_pa;
- uint64_t pde;
- uint64_t pte;
- u_long pdeindex;
- u_long pteindex;
+ i386_physaddr_pae_t offset;
+ i386_physaddr_pae_t pte_pa;
+ i386_pde_pae_t pde;
+ i386_pte_pae_t pte;
+ kvaddr_t pdeindex;
+ kvaddr_t pteindex;
size_t s;
- uint64_t a;
+ i386_physaddr_pae_t a;
off_t ofs;
- uint64_t *PTD;
+ i386_pde_pae_t *PTD;
vm = kd->vmst;
- PTD = (uint64_t *)vm->PTD;
- offset = va & (PAGE_SIZE - 1);
+ PTD = (i386_pde_pae_t *)vm->PTD;
+ offset = va & I386_PAGE_MASK;
/*
* If we are initializing (kernel page table descriptor pointer
@@ -366,87 +322,101 @@ _kvm_vatop_pae(kvm_t *kd, u_long va, off_t *pa)
s = _kvm_pa2off(kd, va, pa);
if (s == 0) {
_kvm_err(kd, kd->program,
- "_kvm_vatop_pae: bootstrap data not in dump");
+ "_i386_vatop_pae: bootstrap data not in dump");
goto invalid;
} else
- return (PAGE_SIZE - offset);
+ return (I386_PAGE_SIZE - offset);
}
- pdeindex = va >> PDRSHIFT_PAE;
- pde = PTD[pdeindex];
- if (((u_long)pde & PG_V) == 0) {
+ pdeindex = va >> I386_PDRSHIFT_PAE;
+ pde = le64toh(PTD[pdeindex]);
+ if ((pde & I386_PG_V) == 0) {
_kvm_err(kd, kd->program, "_kvm_kvatop_pae: pde not valid");
goto invalid;
}
- if ((u_long)pde & PG_PS) {
- /*
- * No second-level page table; ptd describes one 2MB page.
- * (We assume that the kernel wouldn't set PG_PS without enabling
- * it cr0).
- */
-#define PAGE2M_MASK (NBPDR_PAE - 1)
-#define PG_FRAME2M (~PAGE2M_MASK)
- pde_pa = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
- s = _kvm_pa2off(kd, pde_pa, &ofs);
+ if (pde & I386_PG_PS) {
+ /*
+ * No second-level page table; ptd describes one 2MB
+ * page. (We assume that the kernel wouldn't set
+ * PG_PS without enabling it cr0).
+ */
+ offset = va & I386_PAGE_PS_MASK_PAE;
+ a = (pde & I386_PG_PS_FRAME_PAE) + offset;
+ s = _kvm_pa2off(kd, a, pa);
if (s == 0) {
_kvm_err(kd, kd->program,
- "_kvm_vatop: 2MB page address not in dump");
+ "_i386_vatop: 2MB page address not in dump");
goto invalid;
}
- *pa = ofs;
- return (NBPDR_PAE - (va & PAGE2M_MASK));
+ return (I386_NBPDR_PAE - offset);
}
- pteindex = (va >> PAGE_SHIFT) & (NPTEPG_PAE-1);
- pte_pa = ((uint64_t)pde & PG_FRAME_PAE) + (pteindex * sizeof(pde));
+ pteindex = (va >> I386_PAGE_SHIFT) & (I386_NPTEPG_PAE - 1);
+ pte_pa = (pde & I386_PG_FRAME_PAE) + (pteindex * sizeof(pde));
s = _kvm_pa2off(kd, pte_pa, &ofs);
- if (s < sizeof pte) {
- _kvm_err(kd, kd->program, "_kvm_vatop_pae: pdpe_pa not found");
+ if (s < sizeof(pte)) {
+ _kvm_err(kd, kd->program, "_i386_vatop_pae: pdpe_pa not found");
goto invalid;
}
/* XXX This has to be a physical address read, kvm_read is virtual */
- if (lseek(kd->pmfd, ofs, 0) == -1) {
- _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: lseek");
- goto invalid;
- }
- if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
- _kvm_syserr(kd, kd->program, "_kvm_vatop_pae: read");
+ if (pread(kd->pmfd, &pte, sizeof(pte), ofs) != sizeof(pte)) {
+ _kvm_syserr(kd, kd->program, "_i386_vatop_pae: read");
goto invalid;
}
- if (((uint64_t)pte & PG_V) == 0) {
- _kvm_err(kd, kd->program, "_kvm_vatop_pae: pte not valid");
+ pte = le64toh(pte);
+ if ((pte & I386_PG_V) == 0) {
+ _kvm_err(kd, kd->program, "_i386_vatop_pae: pte not valid");
goto invalid;
}
- a = ((uint64_t)pte & PG_FRAME_PAE) + offset;
- s =_kvm_pa2off(kd, a, pa);
+ a = (pte & I386_PG_FRAME_PAE) + offset;
+ s = _kvm_pa2off(kd, a, pa);
if (s == 0) {
_kvm_err(kd, kd->program,
- "_kvm_vatop_pae: address not in dump");
+ "_i386_vatop_pae: address not in dump");
goto invalid;
} else
- return (PAGE_SIZE - offset);
+ return (I386_PAGE_SIZE - offset);
invalid:
- _kvm_err(kd, 0, "invalid address (0x%lx)", va);
+ _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
return (0);
}
-int
-_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
+static int
+_i386_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
{
- if (kd->vmst->minidump)
- return (_kvm_minidump_kvatop(kd, va, pa));
if (ISALIVE(kd)) {
_kvm_err(kd, 0, "vatop called in live kernel!");
return (0);
}
if (kd->vmst->pae)
- return (_kvm_vatop_pae(kd, va, pa));
+ return (_i386_vatop_pae(kd, va, pa));
else
- return (_kvm_vatop(kd, va, pa));
+ return (_i386_vatop(kd, va, pa));
+}
+
+int
+_i386_native(kvm_t *kd)
+{
+
+#ifdef __i386__
+ return (1);
+#else
+ return (0);
+#endif
}
+
+struct kvm_arch kvm_i386 = {
+ .ka_probe = _i386_probe,
+ .ka_initvtop = _i386_initvtop,
+ .ka_freevtop = _i386_freevtop,
+ .ka_kvatop = _i386_kvatop,
+ .ka_native = _i386_native,
+};
+
+KVM_ARCH(kvm_i386);