diff options
Diffstat (limited to 'meta/recipes-kernel/kexec/kexec-tools/0005-arm64-kdump-add-elf-core-header-segment.patch')
| -rw-r--r-- | meta/recipes-kernel/kexec/kexec-tools/0005-arm64-kdump-add-elf-core-header-segment.patch | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/meta/recipes-kernel/kexec/kexec-tools/0005-arm64-kdump-add-elf-core-header-segment.patch b/meta/recipes-kernel/kexec/kexec-tools/0005-arm64-kdump-add-elf-core-header-segment.patch new file mode 100644 index 0000000000..fe535b6070 --- /dev/null +++ b/meta/recipes-kernel/kexec/kexec-tools/0005-arm64-kdump-add-elf-core-header-segment.patch @@ -0,0 +1,191 @@ +From 769da25627cebb2a53caee5d5be78a32d376adc1 Mon Sep 17 00:00:00 2001 +From: AKASHI Takahiro <takahiro.akashi@linaro.org> +Date: Wed, 5 Aug 2015 13:45:15 +0900 +Subject: [PATCH 5/9] arm64: kdump: add elf core header segment + +Elf core header contains the information necessary for the coredump of +the 1st kernel, including its physcal memory layout as well as cpu register +states at the panic. +The segment is allocated inside the reserved memory of crash dump kernel. + +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 | 96 ++++++++++++++++++++++++++++++++++++++ + kexec/arch/arm64/crashdump-arm64.h | 3 ++ + kexec/arch/arm64/iomem.h | 2 + + kexec/arch/arm64/kexec-elf-arm64.c | 10 ++++ + 4 files changed, 111 insertions(+) + +diff --git a/kexec/arch/arm64/crashdump-arm64.c b/kexec/arch/arm64/crashdump-arm64.c +index dcaca43..8346131 100644 +--- a/kexec/arch/arm64/crashdump-arm64.c ++++ b/kexec/arch/arm64/crashdump-arm64.c +@@ -39,6 +39,39 @@ struct memory_ranges usablemem_rgns = { + .ranges = &crash_reserved_mem, + }; + ++struct memory_range elfcorehdr_mem; ++ ++static struct crash_elf_info elf_info = { ++ .class = ELFCLASS64, ++#if (__BYTE_ORDER == __LITTLE_ENDIAN) ++ .data = ELFDATA2LSB, ++#else ++ .data = ELFDATA2MSB, ++#endif ++ .machine = EM_AARCH64, ++}; ++ ++/* ++ * Note: The returned value is correct only if !CONFIG_RANDOMIZE_BASE. ++ */ ++static uint64_t get_kernel_page_offset(void) ++{ ++ int i; ++ ++ if (elf_info.kern_vaddr_start == UINT64_MAX) ++ return UINT64_MAX; ++ ++ /* Current max virtual memory range is 48-bits. */ ++ for (i = 48; i > 0; i--) ++ if (!(elf_info.kern_vaddr_start & (1UL << i))) ++ break; ++ ++ if (i <= 0) ++ return UINT64_MAX; ++ else ++ return UINT64_MAX << i; ++} ++ + /* + * iomem_range_callback() - callback called for each iomem region + * @data: not used +@@ -62,6 +95,10 @@ static int iomem_range_callback(void *UNUSED(data), int UNUSED(nr), + else if (strncmp(str, SYSTEM_RAM, strlen(SYSTEM_RAM)) == 0) + return mem_regions_add(&crash_memory_rgns, + base, length, RANGE_RAM); ++ else if (strncmp(str, KERNEL_CODE, strlen(KERNEL_CODE)) == 0) ++ elf_info.kern_paddr_start = base; ++ else if (strncmp(str, KERNEL_DATA, strlen(KERNEL_DATA)) == 0) ++ elf_info.kern_size = base + length - elf_info.kern_paddr_start; + + return 0; + } +@@ -115,5 +152,64 @@ static int crash_get_memory_ranges(void) + dbgprint_mem_range("Coredump memory ranges", + crash_memory_rgns.ranges, crash_memory_rgns.size); + ++ /* ++ * For additional kernel code/data segment. ++ * kern_paddr_start/kern_size are determined in iomem_range_callback ++ */ ++ elf_info.kern_vaddr_start = get_kernel_sym("_text"); ++ if (!elf_info.kern_vaddr_start) ++ elf_info.kern_vaddr_start = UINT64_MAX; ++ ++ return 0; ++} ++ ++/* ++ * load_crashdump_segments() - load the elf core header ++ * @info: kexec info structure ++ * ++ * This function creates and loads an additional segment of elf core header ++ : which is used to construct /proc/vmcore on crash dump kernel. ++ * ++ * Return 0 in case of success and -1 in case of error. ++ */ ++ ++int load_crashdump_segments(struct kexec_info *info) ++{ ++ unsigned long elfcorehdr; ++ unsigned long bufsz; ++ void *buf; ++ int err; ++ ++ /* ++ * First fetch all the memory (RAM) ranges that we are going to ++ * pass to the crash dump kernel during panic. ++ */ ++ ++ err = crash_get_memory_ranges(); ++ ++ if (err) ++ return err; ++ ++ elf_info.page_offset = get_kernel_page_offset(); ++ dbgprintf("%s: page_offset: %016llx\n", __func__, ++ elf_info.page_offset); ++ ++ err = crash_create_elf64_headers(info, &elf_info, ++ crash_memory_rgns.ranges, crash_memory_rgns.size, ++ &buf, &bufsz, ELF_CORE_HEADER_ALIGN); ++ ++ if (err) ++ return err; ++ ++ elfcorehdr = add_buffer_phys_virt(info, buf, bufsz, bufsz, 0, ++ crash_reserved_mem.start, crash_reserved_mem.end, ++ -1, 0); ++ ++ elfcorehdr_mem.start = elfcorehdr; ++ elfcorehdr_mem.end = elfcorehdr + bufsz - 1; ++ ++ dbgprintf("%s: elfcorehdr 0x%llx-0x%llx\n", __func__, ++ elfcorehdr_mem.start, elfcorehdr_mem.end); ++ + return 0; + } +diff --git a/kexec/arch/arm64/crashdump-arm64.h b/kexec/arch/arm64/crashdump-arm64.h +index 07a0ed0..da75a2d 100644 +--- a/kexec/arch/arm64/crashdump-arm64.h ++++ b/kexec/arch/arm64/crashdump-arm64.h +@@ -18,5 +18,8 @@ + + extern struct memory_ranges usablemem_rgns; + extern struct memory_range crash_reserved_mem; ++extern struct memory_range elfcorehdr_mem; ++ ++extern int load_crashdump_segments(struct kexec_info *info); + + #endif /* CRASHDUMP_ARM64_H */ +diff --git a/kexec/arch/arm64/iomem.h b/kexec/arch/arm64/iomem.h +index 20cda87..d4864bb 100644 +--- a/kexec/arch/arm64/iomem.h ++++ b/kexec/arch/arm64/iomem.h +@@ -2,6 +2,8 @@ + #define IOMEM_H + + #define SYSTEM_RAM "System RAM\n" ++#define KERNEL_CODE "Kernel code\n" ++#define KERNEL_DATA "Kernel data\n" + #define CRASH_KERNEL "Crash kernel\n" + #define IOMEM_RESERVED "reserved\n" + +diff --git a/kexec/arch/arm64/kexec-elf-arm64.c b/kexec/arch/arm64/kexec-elf-arm64.c +index daf8bf0..c70a37a 100644 +--- a/kexec/arch/arm64/kexec-elf-arm64.c ++++ b/kexec/arch/arm64/kexec-elf-arm64.c +@@ -119,6 +119,16 @@ int elf_arm64_load(int argc, char **argv, const char *kernel_buf, + dbgprintf("%s: PE format: %s\n", __func__, + (arm64_header_check_pe_sig(header) ? "yes" : "no")); + ++ if (info->kexec_flags & KEXEC_ON_CRASH) { ++ /* create and initialize elf core header segment */ ++ result = load_crashdump_segments(info); ++ if (result) { ++ dbgprintf("%s: Creating eflcorehdr failed.\n", ++ __func__); ++ goto exit; ++ } ++ } ++ + /* load the kernel */ + result = elf_exec_load(&ehdr, info); + +-- +1.9.1 + |