MFC r273284:

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

1 files changed, 26 insertions, 10 deletions

diff --git a/lib/libkvm/kvm_arm.c b/lib/libkvm/kvm_arm.c
index b1274e9..2c686b2 100644
--- a/lib/libkvm/kvm_arm.c
+++ b/lib/libkvm/kvm_arm.c
@@ -128,8 +128,10 @@ _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) {
@@ -154,19 +156,33 @@ _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";
+
+	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 (kvm_nlist(kd, nl) != 0)
-		kernbase = KERNBASE;
-	else
-		kernbase = nl[0].n_value;
+	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);
+		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");