libkvm bits for arm.
This commit is contained in:
Olivier Houchard
parent
31fbb5019f
commit
9960ac47e9
@ -39,8 +39,14 @@
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/elf32.h>
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#include <sys/mman.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <machine/pmap.h>
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#include <db.h>
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#include <limits.h>
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@ -49,37 +55,175 @@ __FBSDID("$FreeBSD$");
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#include "kvm_private.h"
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struct vmstate {
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pd_entry_t *l1pt;
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void *mmapbase;
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size_t mmapsize;
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};
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static int
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_kvm_maphdrs(kvm_t *kd, size_t sz)
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{
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struct vmstate *vm = kd->vmst;
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/* munmap() previous mmap(). */
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if (vm->mmapbase != NULL) {
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munmap(vm->mmapbase, vm->mmapsize);
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vm->mmapbase = NULL;
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}
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vm->mmapsize = sz;
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vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
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if (vm->mmapbase == MAP_FAILED) {
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_kvm_err(kd, kd->program, "cannot mmap corefile");
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return (-1);
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}
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return (0);
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}
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/*
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* Translate a physical memory address to a file-offset in the crash-dump.
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*/
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static size_t
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_kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs, size_t pgsz)
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{
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Elf32_Ehdr *e = kd->vmst->mmapbase;
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Elf32_Phdr *p = (Elf32_Phdr*)((char*)e + e->e_phoff);
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int n = e->e_phnum;
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while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
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p++, n--;
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if (n == 0)
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return (0);
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*ofs = (pa - p->p_paddr) + p->p_offset;
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if (pgsz == 0)
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return (p->p_memsz - (pa - p->p_paddr));
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return (pgsz - ((size_t)pa & (pgsz - 1)));
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}
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void
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_kvm_freevtop(kd)
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kvm_t *kd;
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_kvm_freevtop(kvm_t *kd)
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{
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if (kd->vmst != 0)
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if (kd->vmst != 0) {
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if (kd->vmst->mmapbase != NULL)
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munmap(kd->vmst->mmapbase, kd->vmst->mmapsize);
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free(kd->vmst);
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kd->vmst = NULL;
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}
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}
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int
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_kvm_initvtop(kd)
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kvm_t *kd;
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_kvm_initvtop(kvm_t *kd)
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{
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struct vmstate *vm = _kvm_malloc(kd, sizeof(*vm));
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struct nlist nlist[2];
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u_long kernbase, physaddr, pa;
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pd_entry_t *l1pt;
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Elf32_Ehdr *ehdr;
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size_t hdrsz;
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if (vm == 0) {
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_kvm_err(kd, kd->program, "cannot allocate vm");
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return (-1);
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}
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kd->vmst = vm;
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vm->l1pt = NULL;
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if (_kvm_maphdrs(kd, sizeof(Elf32_Ehdr)) == -1)
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return (-1);
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ehdr = kd->vmst->mmapbase;
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hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
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if (_kvm_maphdrs(kd, hdrsz) == -1)
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return (-1);
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nlist[0].n_name = "kernbase";
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nlist[1].n_name = NULL;
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if (kvm_nlist(kd, nlist) != 0)
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kernbase = KERNBASE;
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else
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kernbase = nlist[0].n_value;
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nlist[0].n_name = "physaddr";
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if (kvm_nlist(kd, nlist) != 0) {
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_kvm_err(kd, kd->program, "couldn't get phys addr");
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return (-1);
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}
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physaddr = nlist[0].n_value;
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nlist[0].n_name = "kernel_l1pa";
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if (kvm_nlist(kd, nlist) != 0) {
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_kvm_err(kd, kd->program, "bad namelist");
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return (-1);
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}
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if (kvm_read(kd, (nlist[0].n_value - kernbase + physaddr), &pa,
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sizeof(pa)) != sizeof(pa)) {
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_kvm_err(kd, kd->program, "cannot read kernel_l1pa");
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return (-1);
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}
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l1pt = _kvm_malloc(kd, L1_TABLE_SIZE);
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if (kvm_read(kd, pa, l1pt, L1_TABLE_SIZE) != L1_TABLE_SIZE) {
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_kvm_err(kd, kd->program, "cannot read l1pt");
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free(l1pt);
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return (-1);
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}
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vm->l1pt = l1pt;
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return 0;
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}
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/* from arm/pmap.c */
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#define L1_IDX(va) (((vm_offset_t)(va)) >> L1_S_SHIFT)
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/* from arm/pmap.h */
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#define L1_TYPE_INV 0x00 /* Invalid (fault) */
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#define L1_TYPE_C 0x01 /* Coarse L2 */
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#define L1_TYPE_S 0x02 /* Section */
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#define L1_TYPE_F 0x03 /* Fine L2 */
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#define L1_TYPE_MASK 0x03 /* mask of type bits */
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#define l1pte_section_p(pde) (((pde) & L1_TYPE_MASK) == L1_TYPE_S)
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#define l1pte_valid(pde) ((pde) != 0)
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#define l2pte_valid(pte) ((pte) != 0)
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#define l2pte_index(v) (((v) & L2_ADDR_BITS) >> L2_S_SHIFT)
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int
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_kvm_kvatop(kd, va, pa)
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kvm_t *kd;
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u_long va;
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off_t *pa;
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_kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
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{
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_kvm_err(kd, 0, "vatop not yet implemented!");
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return 0;
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}
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u_long offset = va & (PAGE_SIZE - 1);
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struct vmstate *vm = kd->vmst;
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pd_entry_t pd;
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pt_entry_t pte;
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u_long pte_pa;
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off_t
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_kvm_pa2off(kd, pa)
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kvm_t *kd;
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u_long pa;
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{
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_kvm_err(kd, 0, "pa2off not yet implemented!");
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if (vm->l1pt == NULL)
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return (_kvm_pa2off(kd, va, pa, PAGE_SIZE));
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pd = vm->l1pt[L1_IDX(va)];
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if (!l1pte_valid(pd))
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goto invalid;
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if (l1pte_section_p(pd)) {
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/* 1MB section mapping. */
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*pa = ((u_long)pd & L1_S_ADDR_MASK) + (va & L1_S_OFFSET);
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return (_kvm_pa2off(kd, *pa, pa, L1_S_SIZE));
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}
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pte_pa = (pd & L1_ADDR_MASK) + l2pte_index(va) * sizeof(pte);
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_kvm_pa2off(kd, pte_pa, (off_t *)&pte_pa, L1_S_SIZE);
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if (lseek(kd->pmfd, pte_pa, 0) == -1) {
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_kvm_syserr(kd, kd->program, "_kvm_kvatop: lseek");
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goto invalid;
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}
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if (read(kd->pmfd, &pte, sizeof(pte)) != sizeof (pte)) {
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_kvm_syserr(kd, kd->program, "_kvm_kvatop: read");
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goto invalid;
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}
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if (!l2pte_valid(pte)) {
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goto invalid;
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}
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if ((pte & L2_TYPE_MASK) == L2_TYPE_L) {
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*pa = (pte & L2_L_FRAME) | (va & L2_L_OFFSET);
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return (_kvm_pa2off(kd, *pa, pa, L2_L_SIZE));
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}
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*pa = (pte & L2_S_FRAME) | (va & L2_S_OFFSET);
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return (_kvm_pa2off(kd, *pa, pa, PAGE_SIZE));
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invalid:
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_kvm_err(kd, 0, "Invalid address (%x)", va);
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return 0;
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}
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