[Resend PATCH v4 2/9] kexec: generalize and rename get_kernel_stext_sym()

[Pratyush Anand]

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 at redhat.com>
[created symbols.c]
Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
---
 kexec/Makefile                  |  1 +
 kexec/arch/arm/crashdump-arm.c  | 40 +---------------------------------------
 kexec/arch/i386/crashdump-x86.c | 29 -----------------------------
 kexec/kexec.h                   |  2 ++
 kexec/symbols.c                 | 41 +++++++++++++++++++++++++++++++++++++++++
 5 files changed, 45 insertions(+), 68 deletions(-)
 create mode 100644 kexec/symbols.c

diff --git a/kexec/Makefile b/kexec/Makefile
index 39f365f543d7..2b4fb3d162ec 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 4a89b5ea9645..245c21af5e32 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 ab833d416320..abf82a5537ce 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, "%Lx %c %s", &vaddr, &type, sym) != 3)
-			continue;
-		if (strcmp(sym, symbol) == 0) {
-			dbgprintf("kernel symbol %s vaddr = %16llx\n", symbol, vaddr);
-			return vaddr;
-		}
-	}
-
-	fprintf(stderr, "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 9194f1c87c91..b4fafad9487b 100644
--- a/kexec/kexec.h
+++ b/kexec/kexec.h
@@ -312,4 +312,6 @@ int xen_kexec_load(struct kexec_info *info);
 int xen_kexec_unload(uint64_t kexec_flags);
 void xen_kexec_exec(void);
 
+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 000000000000..ea6e3279e464
--- /dev/null
+++ b/kexec/symbols.c
@@ -0,0 +1,41 @@
+#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 *text)
+{
+	const char *kallsyms = "/proc/kallsyms";
+	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, text) == 0) {
+			dbgprintf("kernel symbol %s vaddr = %#llx\n",
+								text, addr);
+			vaddr = addr;
+			break;
+		}
+	}
+
+	fclose(fp);
+
+	if (vaddr == 0)
+		fprintf(stderr, "Cannot get kernel %s symbol address\n", text);
+
+	return vaddr;
+}
-- 
2.7.4