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Allow libkvm to get the kernel va to pa delta without the need for

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physaddr. This should allow for a kernel where PHYSADDR and KERNPHYSADDR
are both undefined.

For now libkvm will use the old method of reading physaddr and kernaddr
to allow it to work with old kernels. This could be removed in the future
when enough time has passed.

Differential Revision:	https://reviews.freebsd.org/D939
MFC after:	1 week
This commit is contained in:
Andrew Turner 2014-10-19 20:23:31 +00:00
parent a2d27ff80e
commit 58c47a70a3
3 changed files with 56 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
lib/libkvm/kvm_arm.c
View File

@ -132,8 +132,10 @@ _kvm_initvtop(kvm_t *kd)
u_long kernbase, physaddr, pa;
pd_entry_t *l1pt;
Elf32_Ehdr *ehdr;
Elf32_Phdr *phdr;
size_t hdrsz;
char minihdr[8];
int found, i;
if (!kd->rawdump) {
if (pread(kd->pmfd, &minihdr, 8, 0) == 8) {
@ -158,19 +160,33 @@ _kvm_initvtop(kvm_t *kd)
hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
if (_kvm_maphdrs(kd, hdrsz) == -1)
return (-1);
nl[0].n_name = "kernbase";
nl[1].n_name = NULL;
if (kvm_nlist(kd, nl) != 0)
kernbase = KERNBASE;
else
kernbase = nl[0].n_value;
nl[0].n_name = "physaddr";
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "couldn't get phys addr");
return (-1);
phdr = (Elf32_Phdr *)((uint8_t *)ehdr + ehdr->e_phoff);
found = 0;
for (i = 0; i < ehdr->e_phnum; i++) {
if (phdr[i].p_type == PT_DUMP_DELTA) {
kernbase = phdr[i].p_vaddr;
physaddr = phdr[i].p_paddr;
found = 1;
break;
}
}
nl[1].n_name = NULL;
if (!found) {
nl[0].n_name = "kernbase";
if (kvm_nlist(kd, nl) != 0)
kernbase = KERNBASE;
else
kernbase = nl[0].n_value;
nl[0].n_name = "physaddr";
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "couldn't get phys addr");
return (-1);
}
physaddr = nl[0].n_value;
}
physaddr = nl[0].n_value;
nl[0].n_name = "kernel_l1pa";
if (kvm_nlist(kd, nl) != 0) {
_kvm_err(kd, kd->program, "bad namelist");

29
sys/arm/arm/dump_machdep.c
View File

@ -245,6 +245,29 @@ cb_dumphdr(struct md_pa *mdp, int seqnr, void *arg)
return (error);
}
/*
* Add a header to be used by libkvm to get the va to pa delta
*/
static int
dump_os_header(struct dumperinfo *di)
{
Elf_Phdr phdr;
int error;
bzero(&phdr, sizeof(phdr));
phdr.p_type = PT_DUMP_DELTA;
phdr.p_flags = PF_R; /* XXX */
phdr.p_offset = 0;
phdr.p_vaddr = KERNVIRTADDR;
phdr.p_paddr = pmap_kextract(KERNVIRTADDR);
phdr.p_filesz = 0;
phdr.p_memsz = 0;
phdr.p_align = PAGE_SIZE;
error = buf_write(di, (char*)&phdr, sizeof(phdr));
return (error);
}
static int
cb_size(struct md_pa *mdp, int seqnr, void *arg)
{
@ -308,7 +331,7 @@ dumpsys(struct dumperinfo *di)
/* Calculate dump size. */
dumpsize = 0L;
ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize);
ehdr.e_phnum = foreach_chunk(cb_size, &dumpsize) + 1;
hdrsz = ehdr.e_phoff + ehdr.e_phnum * ehdr.e_phentsize;
fileofs = MD_ALIGN(hdrsz);
dumpsize += fileofs;
@ -325,7 +348,7 @@ dumpsys(struct dumperinfo *di)
mkdumpheader(&kdh, KERNELDUMPMAGIC, KERNELDUMP_ARM_VERSION, dumpsize, di->blocksize);
printf("Dumping %llu MB (%d chunks)\n", (long long)dumpsize >> 20,
ehdr.e_phnum);
ehdr.e_phnum - 1);
/* Dump leader */
error = dump_write(di, &kdh, 0, dumplo, sizeof(kdh));
@ -340,6 +363,8 @@ dumpsys(struct dumperinfo *di)
/* Dump program headers */
error = foreach_chunk(cb_dumphdr, di);
if (error >= 0)
error = dump_os_header(di);
if (error < 0)
goto fail;
buf_flush(di);

2
sys/sys/elf_common.h
View File

@ -340,6 +340,8 @@ typedef struct {
#define PT_GNU_EH_FRAME 0x6474e550
#define PT_GNU_STACK 0x6474e551
#define PT_GNU_RELRO 0x6474e552
#define PT_DUMP_DELTA 0x6fb5d000 /* va->pa map for kernel dumps
(currently arm). */
#define PT_LOSUNW 0x6ffffffa
#define PT_SUNWBSS 0x6ffffffa /* Sun Specific segment */
#define PT_SUNWSTACK 0x6ffffffb /* describes the stack segment */