diff options
Diffstat (limited to 'meta/recipes-kernel/kexec/kexec-tools/0006-arm64-kdump-set-up-kernel-image-segment.patch')
| -rw-r--r-- | meta/recipes-kernel/kexec/kexec-tools/0006-arm64-kdump-set-up-kernel-image-segment.patch | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/meta/recipes-kernel/kexec/kexec-tools/0006-arm64-kdump-set-up-kernel-image-segment.patch b/meta/recipes-kernel/kexec/kexec-tools/0006-arm64-kdump-set-up-kernel-image-segment.patch new file mode 100644 index 0000000000..414955107a --- /dev/null +++ b/meta/recipes-kernel/kexec/kexec-tools/0006-arm64-kdump-set-up-kernel-image-segment.patch @@ -0,0 +1,137 @@ +From 4079c93ac5453ef5f7889ab64920c1e9427690ef Mon Sep 17 00:00:00 2001 +From: AKASHI Takahiro <takahiro.akashi@linaro.org> +Date: Tue, 17 Feb 2015 16:06:55 +0900 +Subject: [PATCH 6/9] arm64: kdump: set up kernel image segment + +On arm64, we can use the same kernel image as 1st kernel, but +we have to modify the entry point as well as segments' addresses +in the kernel's elf header in order to load them into correct places. + +Upstream-Status: Backport [https://git.linaro.org/people/takahiro.akashi/kexec-tools.git] + +Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> +Signed-off-by: He Zhe <zhe.he@windriver.com> +--- + kexec/arch/arm64/crashdump-arm64.c | 23 +++++++++++++++++++++++ + kexec/arch/arm64/crashdump-arm64.h | 1 + + kexec/arch/arm64/kexec-arm64.c | 25 ++++++++++++++++++++----- + kexec/arch/arm64/kexec-elf-arm64.c | 10 +++++++++- + 4 files changed, 53 insertions(+), 6 deletions(-) + +diff --git a/kexec/arch/arm64/crashdump-arm64.c b/kexec/arch/arm64/crashdump-arm64.c +index 8346131..9517329 100644 +--- a/kexec/arch/arm64/crashdump-arm64.c ++++ b/kexec/arch/arm64/crashdump-arm64.c +@@ -213,3 +213,26 @@ int load_crashdump_segments(struct kexec_info *info) + + return 0; + } ++ ++/* ++ * e_entry and p_paddr are actually in virtual address space. ++ * Those values will be translated to physcal addresses by ++ * using virt_to_phys(). ++ * So let's get ready for later use so the memory base (phys_offset) ++ * will be correctly replaced with crash_reserved_mem.start. ++ */ ++void modify_ehdr_for_crashdump(struct mem_ehdr *ehdr) ++{ ++ struct mem_phdr *phdr; ++ int i; ++ ++ ehdr->e_entry += - arm64_mem.phys_offset + crash_reserved_mem.start; ++ ++ for (i = 0; i < ehdr->e_phnum; i++) { ++ phdr = &ehdr->e_phdr[i]; ++ if (phdr->p_type != PT_LOAD) ++ continue; ++ phdr->p_paddr += ++ (-arm64_mem.phys_offset + crash_reserved_mem.start); ++ } ++} +diff --git a/kexec/arch/arm64/crashdump-arm64.h b/kexec/arch/arm64/crashdump-arm64.h +index da75a2d..382f571 100644 +--- a/kexec/arch/arm64/crashdump-arm64.h ++++ b/kexec/arch/arm64/crashdump-arm64.h +@@ -21,5 +21,6 @@ extern struct memory_range crash_reserved_mem; + extern struct memory_range elfcorehdr_mem; + + extern int load_crashdump_segments(struct kexec_info *info); ++extern void modify_ehdr_for_crashdump(struct mem_ehdr *ehdr); + + #endif /* CRASHDUMP_ARM64_H */ +diff --git a/kexec/arch/arm64/kexec-arm64.c b/kexec/arch/arm64/kexec-arm64.c +index 8ac811d..cec4e41 100644 +--- a/kexec/arch/arm64/kexec-arm64.c ++++ b/kexec/arch/arm64/kexec-arm64.c +@@ -307,12 +307,27 @@ unsigned long arm64_locate_kernel_segment(struct kexec_info *info) + { + unsigned long hole; + +- hole = locate_hole(info, +- arm64_mem.text_offset + arm64_mem.image_size, +- MiB(2), 0, ULONG_MAX, 1); ++ if (info->kexec_flags & KEXEC_ON_CRASH) { ++ unsigned long hole_end; ++ ++ hole = (crash_reserved_mem.start < mem_min ? ++ mem_min : crash_reserved_mem.start); ++ hole = _ALIGN_UP(hole, MiB(2)); ++ hole_end = hole + arm64_mem.text_offset + arm64_mem.image_size; ++ ++ if ((hole_end > mem_max) || ++ (hole_end > crash_reserved_mem.end)) { ++ dbgprintf("%s: Crash kernel out of range\n", __func__); ++ hole = ULONG_MAX; ++ } ++ } else { ++ hole = locate_hole(info, ++ arm64_mem.text_offset + arm64_mem.image_size, ++ MiB(2), 0, ULONG_MAX, 1); + +- if (hole == ULONG_MAX) +- dbgprintf("%s: locate_hole failed\n", __func__); ++ if (hole == ULONG_MAX) ++ dbgprintf("%s: locate_hole failed\n", __func__); ++ } + + return hole; + } +diff --git a/kexec/arch/arm64/kexec-elf-arm64.c b/kexec/arch/arm64/kexec-elf-arm64.c +index c70a37a..842ce21 100644 +--- a/kexec/arch/arm64/kexec-elf-arm64.c ++++ b/kexec/arch/arm64/kexec-elf-arm64.c +@@ -9,6 +9,7 @@ + #include <stdlib.h> + #include <linux/elf.h> + ++#include "crashdump-arm64.h" + #include "kexec-arm64.h" + #include "kexec-elf.h" + #include "kexec-syscall.h" +@@ -105,7 +106,8 @@ int elf_arm64_load(int argc, char **argv, const char *kernel_buf, + } + + arm64_mem.vp_offset = _ALIGN_DOWN(ehdr.e_entry, MiB(2)); +- arm64_mem.vp_offset -= kernel_segment - get_phys_offset(); ++ if (!(info->kexec_flags & KEXEC_ON_CRASH)) ++ arm64_mem.vp_offset -= kernel_segment - get_phys_offset(); + + dbgprintf("%s: kernel_segment: %016lx\n", __func__, kernel_segment); + dbgprintf("%s: text_offset: %016lx\n", __func__, +@@ -127,6 +129,12 @@ int elf_arm64_load(int argc, char **argv, const char *kernel_buf, + __func__); + goto exit; + } ++ ++ /* ++ * offset addresses in order to fit vmlinux ++ * (elf_exec) into crash kernel's memory ++ */ ++ modify_ehdr_for_crashdump(&ehdr); + } + + /* load the kernel */ +-- +1.9.1 + |