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authorPratyush Anand <panand@redhat.com>2016-11-02 15:05:25 +0530
committerAKASHI Takahiro <takahiro.akashi@linaro.org>2017-05-22 09:09:36 +0900
commitd4f920d064bd4db477dffb0a4293f03971a19e89 (patch)
treee0f9131d38e423d55702647f8c7c865ae760bff1
parent2af165c586b6f4aa37514e363462083329f94899 (diff)
downloadkexec-tools-d4f920d064bd4db477dffb0a4293f03971a19e89.tar.gz
kexec: generalize and rename get_kernel_stext_sym()
get_kernel_stext_sym() has been defined for both arm and i386. Other architecture might need some other kernel symbol address. Therefore rewrite this function as generic function to get any kernel symbol address. More over, kallsyms is not arch specific representation, therefore have common function for all arches. Signed-off-by: Pratyush Anand <panand@redhat.com> [created symbols.c] Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
-rw-r--r--kexec/Makefile1
-rw-r--r--kexec/arch/arm/crashdump-arm.c40
-rw-r--r--kexec/arch/i386/crashdump-x86.c29
-rw-r--r--kexec/kexec.h2
-rw-r--r--kexec/symbols.c34
5 files changed, 38 insertions, 68 deletions
diff --git a/kexec/Makefile b/kexec/Makefile
index 39f365f..2b4fb3d 100644
--- a/kexec/Makefile
+++ b/kexec/Makefile
@@ -26,6 +26,7 @@ KEXEC_SRCS_base += kexec/kernel_version.c
KEXEC_SRCS_base += kexec/lzma.c
KEXEC_SRCS_base += kexec/zlib.c
KEXEC_SRCS_base += kexec/kexec-xen.c
+KEXEC_SRCS_base += kexec/symbols.c
KEXEC_GENERATED_SRCS += $(PURGATORY_HEX_C)
diff --git a/kexec/arch/arm/crashdump-arm.c b/kexec/arch/arm/crashdump-arm.c
index ac76e0a..daa4788 100644
--- a/kexec/arch/arm/crashdump-arm.c
+++ b/kexec/arch/arm/crashdump-arm.c
@@ -73,48 +73,10 @@ static struct crash_elf_info elf_info = {
extern unsigned long long user_page_offset;
-/* Retrieve kernel _stext symbol virtual address from /proc/kallsyms */
-static unsigned long long get_kernel_stext_sym(void)
-{
- const char *kallsyms = "/proc/kallsyms";
- const char *stext = "_stext";
- char sym[128];
- char line[128];
- FILE *fp;
- unsigned long long vaddr = 0;
- char type;
-
- fp = fopen(kallsyms, "r");
- if (!fp) {
- fprintf(stderr, "Cannot open %s\n", kallsyms);
- return 0;
- }
-
- while(fgets(line, sizeof(line), fp) != NULL) {
- unsigned long long addr;
-
- if (sscanf(line, "%Lx %c %s", &addr, &type, sym) != 3)
- continue;
-
- if (strcmp(sym, stext) == 0) {
- dbgprintf("kernel symbol %s vaddr = %#llx\n", stext, addr);
- vaddr = addr;
- break;
- }
- }
-
- fclose(fp);
-
- if (vaddr == 0)
- fprintf(stderr, "Cannot get kernel %s symbol address\n", stext);
-
- return vaddr;
-}
-
static int get_kernel_page_offset(struct kexec_info *info,
struct crash_elf_info *elf_info)
{
- unsigned long long stext_sym_addr = get_kernel_stext_sym();
+ unsigned long long stext_sym_addr = get_kernel_sym("_stext");
if (stext_sym_addr == 0) {
if (user_page_offset != (-1ULL)) {
elf_info->page_offset = user_page_offset;
diff --git a/kexec/arch/i386/crashdump-x86.c b/kexec/arch/i386/crashdump-x86.c
index 285dea9..69a063a 100644
--- a/kexec/arch/i386/crashdump-x86.c
+++ b/kexec/arch/i386/crashdump-x86.c
@@ -102,35 +102,6 @@ static int get_kernel_paddr(struct kexec_info *UNUSED(info),
return -1;
}
-/* Retrieve kernel symbol virtual address from /proc/kallsyms */
-static unsigned long long get_kernel_sym(const char *symbol)
-{
- const char *kallsyms = "/proc/kallsyms";
- char sym[128];
- char line[128];
- FILE *fp;
- unsigned long long vaddr;
- char type;
-
- fp = fopen(kallsyms, "r");
- if (!fp) {
- fprintf(stderr, "Cannot open %s\n", kallsyms);
- return 0;
- }
-
- while(fgets(line, sizeof(line), fp) != NULL) {
- if (sscanf(line, "%llx %c %s", &vaddr, &type, sym) != 3)
- continue;
- if (strcmp(sym, symbol) == 0) {
- dbgprintf("kernel symbol %s vaddr = %16llx\n", symbol, vaddr);
- return vaddr;
- }
- }
-
- dbgprintf("Cannot get kernel %s symbol address\n", symbol);
- return 0;
-}
-
/* Retrieve info regarding virtual address kernel has been compiled for and
* size of the kernel from /proc/kcore. Current /proc/kcore parsing from
* from kexec-tools fails because of malformed elf notes. A kernel patch has
diff --git a/kexec/kexec.h b/kexec/kexec.h
index 52bef9b..26225d2 100644
--- a/kexec/kexec.h
+++ b/kexec/kexec.h
@@ -317,4 +317,6 @@ int xen_kexec_unload(uint64_t kexec_flags);
void xen_kexec_exec(void);
int xen_kexec_status(uint64_t kexec_flags);
+extern unsigned long long get_kernel_sym(const char *text);
+
#endif /* KEXEC_H */
diff --git a/kexec/symbols.c b/kexec/symbols.c
new file mode 100644
index 0000000..e88f7f3
--- /dev/null
+++ b/kexec/symbols.c
@@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <string.h>
+#include "kexec.h"
+
+/* Retrieve kernel symbol virtual address from /proc/kallsyms */
+unsigned long long get_kernel_sym(const char *symbol)
+{
+ const char *kallsyms = "/proc/kallsyms";
+ char sym[128];
+ char line[128];
+ FILE *fp;
+ unsigned long long vaddr;
+ char type;
+
+ fp = fopen(kallsyms, "r");
+ if (!fp) {
+ fprintf(stderr, "Cannot open %s\n", kallsyms);
+ return 0;
+ }
+
+ while (fgets(line, sizeof(line), fp) != NULL) {
+ if (sscanf(line, "%llx %c %s", &vaddr, &type, sym) != 3)
+ continue;
+ if (strcmp(sym, symbol) == 0) {
+ dbgprintf("kernel symbol %s vaddr = %16llx\n",
+ symbol, vaddr);
+ return vaddr;
+ }
+ }
+
+ dbgprintf("Cannot get kernel %s symbol address\n", symbol);
+
+ return 0;
+}