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86 lines
2.8 KiB
86 lines
2.8 KiB
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6 years ago
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From 586c58752e0e48e8ed48ba951e5b1448831bbf11 Mon Sep 17 00:00:00 2001
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Message-Id: <586c58752e0e48e8ed48ba951e5b1448831bbf11.1496033260.git.panand@redhat.com>
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In-Reply-To: <302c16ede3723264ca0abb5eef9c9f553ffcfbd7.1496033260.git.panand@redhat.com>
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References: <302c16ede3723264ca0abb5eef9c9f553ffcfbd7.1496033260.git.panand@redhat.com>
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From: Pratyush Anand <panand@redhat.com>
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Date: Wed, 26 Apr 2017 11:04:07 +0530
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Subject: [PATCH 2/3] x86_64: calculate page_offset in case of
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re-filtering/sadump/virsh dump
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we do not call get_elf_info() in case of refiltering and sadump.
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Therefore, we will not have any pt_load in that case, and so we get:
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get_page_offset_x86_64: Can't get any pt_load to calculate page offset.
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However, we will have vmcoreinfo and vmlinux information in case of
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re-filtering. So, we are able to find kaslr offset and we can get
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page_offset_base address. Thus we can read the page offset as well.
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If kaslr is not enabled and also we do not have valid PT_LOAD to
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calculate page offset then use old method to find fixed page
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offset.
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In case of virsh dump virtual addresses in PT_LOAD are 0. Ignore such
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addresses for the page_offset calculation.
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Suggested-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
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Signed-off-by: Pratyush Anand <panand@redhat.com>
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---
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arch/x86_64.c | 36 +++++++++++++++++++++++++++++-------
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1 file changed, 29 insertions(+), 7 deletions(-)
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diff --git a/makedumpfile-1.6.1/arch/x86_64.c b/makedumpfile-1.6.1/arch/x86_64.c
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index fd2e8ac154d6..18384a8dd684 100644
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--- a/makedumpfile-1.6.1/arch/x86_64.c
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+++ b/makedumpfile-1.6.1/arch/x86_64.c
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@@ -75,17 +75,39 @@ get_page_offset_x86_64(void)
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int i;
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unsigned long long phys_start;
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unsigned long long virt_start;
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+ unsigned long page_offset_base;
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+
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+ if (info->kaslr_offset) {
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+ page_offset_base = get_symbol_addr("page_offset_base");
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+ page_offset_base += info->kaslr_offset;
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+ if (!readmem(VADDR, page_offset_base, &info->page_offset,
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+ sizeof(info->page_offset))) {
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+ ERRMSG("Can't read page_offset_base.\n");
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+ return FALSE;
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+ }
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+ return TRUE;
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+ }
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- for (i = 0; get_pt_load(i, &phys_start, NULL, &virt_start, NULL); i++) {
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- if (virt_start < __START_KERNEL_map
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- && phys_start != NOT_PADDR) {
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- info->page_offset = virt_start - phys_start;
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- return TRUE;
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+ if (get_num_pt_loads()) {
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+ for (i = 0;
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+ get_pt_load(i, &phys_start, NULL, &virt_start, NULL);
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+ i++) {
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+ if (virt_start != NOT_KV_ADDR
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+ && virt_start < __START_KERNEL_map
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+ && phys_start != NOT_PADDR) {
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+ info->page_offset = virt_start - phys_start;
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+ return TRUE;
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+ }
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}
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}
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- ERRMSG("Can't get any pt_load to calculate page offset.\n");
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- return FALSE;
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+ if (info->kernel_version < KERNEL_VERSION(2, 6, 27)) {
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+ info->page_offset = __PAGE_OFFSET_ORIG;
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+ } else {
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+ info->page_offset = __PAGE_OFFSET_2_6_27;
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+ }
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+
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+ return TRUE;
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}
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int
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--
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2.9.3
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