libbpf-tools/capable: Add additional information to backtrace for -v option

Add additional information and change format of backtrace
- add symbol base offset, dso name, dso base offset
- symbol and dso info is included if it's available in target binary
- changed format:
INDEX ADDR [SYMBOL+OFFSET] (MODULE+OFFSET)

before:
  # ./capable -UK
    TIME     UID   PID     COMM             CAP     NAME                 AUDIT   VER DICT
    01:59:17 0     730     irqbalance       21      CAP_SYS_ADMIN        0       deny
        cap_vm_enough_memory
        security_vm_enough_memory_mm
        mmap_region
        do_mmap
        vm_mmap_pgoff
        do_syscall_64
        entry_SYSCALL_64_after_hwframe
        mmap64
        -                irqbalance (730)

After:
  # ./capable -UKv
    TIME     UID   PID     COMM             CAP     NAME                 AUDIT   VERDICT
    01:56:37 0     730     irqbalance       21      CAP_SYS_ADMIN        0       deny
        #0  0xffffffff81447dc6 cap_vm_enough_memory+0x26
        iovisor#1  0xffffffff8144a94f security_vm_enough_memory_mm+0x2f
        iovisor#2  0xffffffff812576e3 mmap_region+0x103
        iovisor#3  0xffffffff8125837e do_mmap+0x3de
        iovisor#4  0xffffffff8122c41c vm_mmap_pgoff+0xdc
        iovisor#5  0xffffffff81dc3be0 do_syscall_64+0x50
        iovisor#6  0xffffffff81e0011b entry_SYSCALL_64_after_hwframe+0x63
        iovisor#7  0x00007f3036e9e9ca mmap64+0xa (/lib/x86_64-linux-gnu/libc-2.19.so+0xf49ca)
        -                irqbalance (730)

Author: ekyooo

libbpf-tools/capable.c

@@ -195,6 +195,8 @@ static void print_map(struct ksyms *ksyms, struct syms_cache *syms_cache)
 	const struct ksym *ksym;
 	const struct syms *syms;
 	const struct sym *sym;
+	struct sym_info sinfo;
+	int idx;
 	int err, i;
 	unsigned long *ip;
 	struct cap_event val;
@@ -206,6 +208,8 @@ static void print_map(struct ksyms *ksyms, struct syms_cache *syms_cache)
 	}
 
 	while (!bpf_map_get_next_key(ifd, &lookup_key, &next_key)) {
+		idx = 0;
+
 		err = bpf_map_lookup_elem(ifd, &next_key, &val);
 		if (err < 0) {
 			fprintf(stderr, "failed to lookup info: %d\n", err);
@@ -218,7 +222,14 @@ static void print_map(struct ksyms *ksyms, struct syms_cache *syms_cache)
 				fprintf(stderr, "    [Missed Kernel Stack]\n");
 			for (i = 0; i < env.perf_max_stack_depth && ip[i]; i++) {
 				ksym = ksyms__map_addr(ksyms, ip[i]);
-				printf("    %s\n", ksym ? ksym->name : "Unknown");
+				if (!env.verbose) {
+					printf("    %s\n", ksym ? ksym->name : "Unknown");
+				} else {
+					if (ksym)
+						printf("    #%-2d 0x%lx %s+0x%lx\n", idx++, ip[i], ksym->name, ip[i] - ksym->addr);
+					else
+						printf("    #%-2d 0x%lx [unknown]\n", idx++, ip[i]);
+				}
 			}
 		}
 
@@ -237,11 +248,22 @@ static void print_map(struct ksyms *ksyms, struct syms_cache *syms_cache)
 				goto skip_ustack;
 			}
 			for (i = 0; i < env.perf_max_stack_depth && ip[i]; i++) {
-				sym = syms__map_addr(syms, ip[i]);
-				if (sym)
-					printf("    %s\n", sym->name);
-				else
-					printf("    [unknown]\n");
+				if (!env.verbose) {
+					sym = syms__map_addr(syms, ip[i]);
+					if (sym)
+						printf("    %s\n", sym->name);
+					else
+						printf("    [unknown]\n");
+				} else {
+					err = syms__map_addr_dso(syms, ip[i], &sinfo);
+					printf("    #%-2d 0x%016lx", idx++, ip[i]);
+					if (err == 0) {
+						if (sinfo.sym_name)
+							printf(" %s+0x%lx", sinfo.sym_name, sinfo.sym_offset);
+						printf(" (%s+0x%lx)", sinfo.dso_name, sinfo.dso_offset);
+					}
+					printf("\n");
+				}
 			}
 		}