With kernel commit 7bc1a0f9e176 ("arm64: mm: use single quantity to
represent the PA to VA translation"), memstart_addr can be negative,
which makes it different from real phy_offset.
In crash utility, PTOV() needs memstart_addr, while getting PFN offset
in a dumpfile, phy_offset is required. So storing them separately for
different purpose.
Signed-off-by: Pingfan Liu <piliu@xxxxxxxxxx>
Cc: Lianbo Jiang <lijiang@xxxxxxxxxx>
To: crash-utility@xxxxxxxxxx
---
arm64.c | 22 +++++++++++++++++++---
defs.h | 1 +
2 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/arm64.c b/arm64.c
index 37aed07..e560d07 100644
--- a/arm64.c
+++ b/arm64.c
@@ -687,6 +687,7 @@ arm64_dump_machdep_table(ulong arg)
fprintf(fp, " kimage_voffset: %016lx\n", ms->kimage_voffset);
}
fprintf(fp, " phys_offset: %lx\n", ms->phys_offset);
+ fprintf(fp, " memstart_addr: %lx\n", ms->memstart_addr);
fprintf(fp, "__exception_text_start: %lx\n", ms->__exception_text_start);
fprintf(fp, " __exception_text_end: %lx\n", ms->__exception_text_end);
fprintf(fp, " __irqentry_text_start: %lx\n", ms->__irqentry_text_start);
@@ -987,7 +988,7 @@ arm64_calc_physvirt_offset(void)
ulong physvirt_offset;
struct syment *sp;
- ms->physvirt_offset = ms->phys_offset - ms->page_offset;
+ ms->physvirt_offset = ms->memstart_addr - ms->page_offset;
if ((sp = kernel_symbol_search("physvirt_offset")) &&
machdep->machspec->kimage_voffset) {
@@ -1028,7 +1029,11 @@ arm64_calc_phys_offset(void)
ms->kimage_voffset && (sp = kernel_symbol_search("memstart_addr"))) {
if (pc->flags & PROC_KCORE) {
if ((string = pc->read_vmcoreinfo("NUMBER(PHYS_OFFSET)"))) {
- ms->phys_offset = htol(string, QUIET, NULL);
+ ms->memstart_addr = htol(string, QUIET, NULL);
+ if (ms->memstart_addr < 0)
+ ms->phys_offset = ms->memstart_addr + 0xffff000000000000 - 0xfff0000000000000;
+ else
+ ms->phys_offset = ms->memstart_addr;
free(string);
return;
}
@@ -1080,7 +1085,18 @@ arm64_calc_phys_offset(void)
} else if (DISKDUMP_DUMPFILE() && diskdump_phys_base(&phys_offset)) {
ms->phys_offset = phys_offset;
} else if (KDUMP_DUMPFILE() && arm64_kdump_phys_base(&phys_offset)) {
- ms->phys_offset = phys_offset;
+ /*
+ * When running a 52bits kernel on 48bits hardware. Kernel plays a trick:
+ * if (IS_ENABLED(CONFIG_ARM64_VA_BITS_52) && (vabits_actual != 52))
+ * memstart_addr -= _PAGE_OFFSET(48) - _PAGE_OFFSET(52);
+ *
+ * In crash, this should be detected to get a real physical start address.
+ */
+ ms->memstart_addr = phys_offset;
+ if ((long)phys_offset < 0)
+ ms->phys_offset = phys_offset + 0xffff000000000000 - 0xfff0000000000000;
+ else
+ ms->phys_offset = phys_offset;
} else {
error(WARNING,
"phys_offset cannot be determined from the dumpfile.\n");
diff --git a/defs.h b/defs.h
index 35b983a..64f2bcb 100644
--- a/defs.h
+++ b/defs.h
@@ -3290,6 +3290,7 @@ struct machine_specific {
ulong modules_vaddr;
ulong modules_end;
ulong phys_offset;
+ long memstart_addr;
ulong __exception_text_start;
ulong __exception_text_end;
struct arm64_pt_regs *panic_task_regs;
--
2.29.2
--
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