[Crash-utility] [PATCH 13/16] MIPS64: Add 'bt -l' command support

[Youling Tang]

Add 'bt -l' command support, get a line number associated with a
current pc address.

E.g. With this patch:
crash> bt -l
PID: 4768   TASK: 9800000243bcf200  CPU: 3   COMMAND: "bash"
 #0 [980000024291f930] __crash_kexec at ffffffff802fff84
    /home/tang/loongson-419/linux-4.19.152kexec/./arch/mips/include/asm/stacktrace.h: 43
 #1 [980000024291faa0] panic at ffffffff80248cac
    /home/tang/loongson-419/linux-4.19.152kexec/kernel/panic.c: 206
...

Signed-off-by: Huacai Chen <chenhuacai at loongson.cn>
Signed-off-by: Youling Tang <tangyouling at loongson.cn>
---
 mips64.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mips64.c b/mips64.c
index 2708f5d..6e8e922 100644
--- a/mips64.c
+++ b/mips64.c
@@ -647,6 +647,15 @@ mips64_dump_backtrace_entry(struct bt_info *bt, struct syment *sym,
 
 	fprintf(fp, "\n");
 
+	/*
+	 * 'bt -l', get a line number associated with a current pc address.
+	 */
+	if (bt->flags & BT_LINE_NUMBERS) {
+		get_line_number(current->pc, buf, FALSE);
+		if (strlen(buf))
+			fprintf(fp, "    %s\n", buf);
+	}
+
 	if (sym && mips64_is_exception_entry(sym)) {
 		GET_STACK_DATA(current->sp, &pt_regs, SIZE(pt_regs));
 		mips64_dump_exception_stack(bt, pt_regs);
-- 
2.1.0