From: Sandipan Das <sandipan@linux.vnet.ibm.com>
Date: Thu, 24 May 2018 12:26:54 +0530
Subject: tools: bpftool: add delimiters to multi-function JITed dumps
Patch-mainline: v4.18-rc1
Git-commit: f7f62c7134288a704f90b137097e1ee689ff25ab
References: bsc#1109837
This splits up the contiguous JITed dump obtained via the bpf
system call into more relatable chunks for each function in
the program. If the kernel symbols corresponding to these are
known, they are printed in the header for each JIT image dump
otherwise the masked start address is printed.
Before applying this patch:
# bpftool prog dump jited id 1
0: push %rbp
1: mov %rsp,%rbp
...
70: leaveq
71: retq
72: push %rbp
73: mov %rsp,%rbp
...
dd: leaveq
de: retq
# bpftool -p prog dump jited id 1
[{
"pc": "0x0",
"operation": "push",
"operands": ["%rbp"
]
},{
...
},{
"pc": "0x71",
"operation": "retq",
"operands": [null
]
},{
"pc": "0x72",
"operation": "push",
"operands": ["%rbp"
]
},{
...
},{
"pc": "0xde",
"operation": "retq",
"operands": [null
]
}
]
After applying this patch:
# echo 0 > /proc/sys/net/core/bpf_jit_kallsyms
# bpftool prog dump jited id 1
0xffffffffc02c7000:
0: push %rbp
1: mov %rsp,%rbp
...
70: leaveq
71: retq
0xffffffffc02cf000:
0: push %rbp
1: mov %rsp,%rbp
...
6b: leaveq
6c: retq
# bpftool -p prog dump jited id 1
[{
"name": "0xffffffffc02c7000",
"insns": [{
"pc": "0x0",
"operation": "push",
"operands": ["%rbp"
]
},{
...
},{
"pc": "0x71",
"operation": "retq",
"operands": [null
]
}
]
},{
"name": "0xffffffffc02cf000",
"insns": [{
"pc": "0x0",
"operation": "push",
"operands": ["%rbp"
]
},{
...
},{
"pc": "0x6c",
"operation": "retq",
"operands": [null
]
}
]
}
]
# echo 1 > /proc/sys/net/core/bpf_jit_kallsyms
# bpftool prog dump jited id 1
bpf_prog_b811aab41a39ad3d_foo:
0: push %rbp
1: mov %rsp,%rbp
...
70: leaveq
71: retq
bpf_prog_cf418ac8b67bebd9_F:
0: push %rbp
1: mov %rsp,%rbp
...
6b: leaveq
6c: retq
# bpftool -p prog dump jited id 1
[{
"name": "bpf_prog_b811aab41a39ad3d_foo",
"insns": [{
"pc": "0x0",
"operation": "push",
"operands": ["%rbp"
]
},{
...
},{
"pc": "0x71",
"operation": "retq",
"operands": [null
]
}
]
},{
"name": "bpf_prog_cf418ac8b67bebd9_F",
"insns": [{
"pc": "0x0",
"operation": "push",
"operands": ["%rbp"
]
},{
...
},{
"pc": "0x6c",
"operation": "retq",
"operands": [null
]
}
]
}
]
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>
Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
tools/bpf/bpftool/prog.c | 73 +++++++++++++++++++++++++++++++++++++-
tools/bpf/bpftool/xlated_dumper.c | 4 +-
tools/bpf/bpftool/xlated_dumper.h | 1
3 files changed, 75 insertions(+), 3 deletions(-)
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -422,7 +422,9 @@ static int do_dump(int argc, char **argv
{
unsigned long *func_ksyms = NULL;
struct bpf_prog_info info = {};
+ unsigned int *func_lens = NULL;
unsigned int nr_func_ksyms;
+ unsigned int nr_func_lens;
struct dump_data dd = {};
__u32 len = sizeof(info);
unsigned int buf_size;
@@ -508,12 +510,24 @@ static int do_dump(int argc, char **argv
}
}
+ nr_func_lens = info.nr_jited_func_lens;
+ if (nr_func_lens) {
+ func_lens = malloc(nr_func_lens * sizeof(__u32));
+ if (!func_lens) {
+ p_err("mem alloc failed");
+ close(fd);
+ goto err_free;
+ }
+ }
+
memset(&info, 0, sizeof(info));
*member_ptr = ptr_to_u64(buf);
*member_len = buf_size;
info.jited_ksyms = ptr_to_u64(func_ksyms);
info.nr_jited_ksyms = nr_func_ksyms;
+ info.jited_func_lens = ptr_to_u64(func_lens);
+ info.nr_jited_func_lens = nr_func_lens;
err = bpf_obj_get_info_by_fd(fd, &info, &len);
close(fd);
@@ -532,6 +546,11 @@ static int do_dump(int argc, char **argv
goto err_free;
}
+ if (info.nr_jited_func_lens > nr_func_lens) {
+ p_err("too many values returned");
+ goto err_free;
+ }
+
if ((member_len == &info.jited_prog_len &&
info.jited_prog_insns == 0) ||
(member_len == &info.xlated_prog_len &&
@@ -569,7 +588,57 @@ static int do_dump(int argc, char **argv
goto err_free;
}
- disasm_print_insn(buf, *member_len, opcodes, name);
+ if (info.nr_jited_func_lens && info.jited_func_lens) {
+ struct kernel_sym *sym = NULL;
+ char sym_name[SYM_MAX_NAME];
+ unsigned char *img = buf;
+ __u64 *ksyms = NULL;
+ __u32 *lens;
+ __u32 i;
+
+ if (info.nr_jited_ksyms) {
+ kernel_syms_load(&dd);
+ ksyms = (__u64 *) info.jited_ksyms;
+ }
+
+ if (json_output)
+ jsonw_start_array(json_wtr);
+
+ lens = (__u32 *) info.jited_func_lens;
+ for (i = 0; i < info.nr_jited_func_lens; i++) {
+ if (ksyms) {
+ sym = kernel_syms_search(&dd, ksyms[i]);
+ if (sym)
+ sprintf(sym_name, "%s", sym->name);
+ else
+ sprintf(sym_name, "0x%016llx", ksyms[i]);
+ } else {
+ strcpy(sym_name, "unknown");
+ }
+
+ if (json_output) {
+ jsonw_start_object(json_wtr);
+ jsonw_name(json_wtr, "name");
+ jsonw_string(json_wtr, sym_name);
+ jsonw_name(json_wtr, "insns");
+ } else {
+ printf("%s:\n", sym_name);
+ }
+
+ disasm_print_insn(img, lens[i], opcodes, name);
+ img += lens[i];
+
+ if (json_output)
+ jsonw_end_object(json_wtr);
+ else
+ printf("\n");
+ }
+
+ if (json_output)
+ jsonw_end_array(json_wtr);
+ } else {
+ disasm_print_insn(buf, *member_len, opcodes, name);
+ }
} else if (visual) {
if (json_output)
jsonw_null(json_wtr);
@@ -589,11 +658,13 @@ static int do_dump(int argc, char **argv
free(buf);
free(func_ksyms);
+ free(func_lens);
return 0;
err_free:
free(buf);
free(func_ksyms);
+ free(func_lens);
return -1;
}
--- a/tools/bpf/bpftool/xlated_dumper.c
+++ b/tools/bpf/bpftool/xlated_dumper.c
@@ -102,8 +102,8 @@ void kernel_syms_destroy(struct dump_dat
free(dd->sym_mapping);
}
-static struct kernel_sym *kernel_syms_search(struct dump_data *dd,
- unsigned long key)
+struct kernel_sym *kernel_syms_search(struct dump_data *dd,
+ unsigned long key)
{
struct kernel_sym sym = {
.address = key,
--- a/tools/bpf/bpftool/xlated_dumper.h
+++ b/tools/bpf/bpftool/xlated_dumper.h
@@ -56,6 +56,7 @@ struct dump_data {
void kernel_syms_load(struct dump_data *dd);
void kernel_syms_destroy(struct dump_data *dd);
+struct kernel_sym *kernel_syms_search(struct dump_data *dd, unsigned long key);
void dump_xlated_json(struct dump_data *dd, void *buf, unsigned int len,
bool opcodes);
void dump_xlated_plain(struct dump_data *dd, void *buf, unsigned int len,