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// SPDX-License-Identifier: GPL-2.0-only
#include "util/annotate.h"
#include "util/disasm_bpf.h"
#include "util/symbol.h"
#include <linux/zalloc.h>
#include <string.h>
#if defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
#define PACKAGE "perf"
#include <bfd.h>
#include <bpf/bpf.h>
#include <bpf/btf.h>
#include <bpf/libbpf.h>
#include <dis-asm.h>
#include <errno.h>
#include <linux/btf.h>
#include <tools/dis-asm-compat.h>
#include "util/bpf-event.h"
#include "util/bpf-utils.h"
#include "util/debug.h"
#include "util/dso.h"
#include "util/map.h"
#include "util/env.h"
#include "util/util.h"
int symbol__disassemble_bpf(struct symbol *sym, struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct bpf_prog_linfo *prog_linfo = NULL;
struct bpf_prog_info_node *info_node;
int len = sym->end - sym->start;
disassembler_ftype disassemble;
struct map *map = args->ms.map;
struct perf_bpil *info_linear;
struct disassemble_info info;
struct dso *dso = map__dso(map);
int pc = 0, count, sub_id;
struct btf *btf = NULL;
char tpath[PATH_MAX];
size_t buf_size;
int nr_skip = 0;
char *buf;
bfd *bfdf;
int ret;
FILE *s;
if (dso__binary_type(dso) != DSO_BINARY_TYPE__BPF_PROG_INFO)
return SYMBOL_ANNOTATE_ERRNO__BPF_INVALID_FILE;
pr_debug("%s: handling sym %s addr %" PRIx64 " len %" PRIx64 "\n", __func__,
sym->name, sym->start, sym->end - sym->start);
memset(tpath, 0, sizeof(tpath));
perf_exe(tpath, sizeof(tpath));
bfdf = bfd_openr(tpath, NULL);
if (bfdf == NULL)
abort();
if (!bfd_check_format(bfdf, bfd_object))
abort();
s = open_memstream(&buf, &buf_size);
if (!s) {
ret = errno;
goto out;
}
init_disassemble_info_compat(&info, s,
(fprintf_ftype) fprintf,
fprintf_styled);
info.arch = bfd_get_arch(bfdf);
info.mach = bfd_get_mach(bfdf);
info_node = perf_env__find_bpf_prog_info(dso__bpf_prog(dso)->env,
dso__bpf_prog(dso)->id);
if (!info_node) {
ret = SYMBOL_ANNOTATE_ERRNO__BPF_MISSING_BTF;
goto out;
}
info_linear = info_node->info_linear;
sub_id = dso__bpf_prog(dso)->sub_id;
info.buffer = (void *)(uintptr_t)(info_linear->info.jited_prog_insns);
info.buffer_length = info_linear->info.jited_prog_len;
if (info_linear->info.nr_line_info)
prog_linfo = bpf_prog_linfo__new(&info_linear->info);
if (info_linear->info.btf_id) {
struct btf_node *node;
node = perf_env__find_btf(dso__bpf_prog(dso)->env,
info_linear->info.btf_id);
if (node)
btf = btf__new((__u8 *)(node->data),
node->data_size);
}
disassemble_init_for_target(&info);
#ifdef DISASM_FOUR_ARGS_SIGNATURE
disassemble = disassembler(info.arch,
bfd_big_endian(bfdf),
info.mach,
bfdf);
#else
disassemble = disassembler(bfdf);
#endif
if (disassemble == NULL)
abort();
fflush(s);
do {
const struct bpf_line_info *linfo = NULL;
struct disasm_line *dl;
size_t prev_buf_size;
const char *srcline;
u64 addr;
addr = pc + ((u64 *)(uintptr_t)(info_linear->info.jited_ksyms))[sub_id];
count = disassemble(pc, &info);
if (prog_linfo)
linfo = bpf_prog_linfo__lfind_addr_func(prog_linfo,
addr, sub_id,
nr_skip);
if (linfo && btf) {
srcline = btf__name_by_offset(btf, linfo->line_off);
nr_skip++;
} else
srcline = NULL;
fprintf(s, "\n");
prev_buf_size = buf_size;
fflush(s);
if (!annotate_opts.hide_src_code && srcline) {
args->offset = -1;
args->line = strdup(srcline);
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl) {
annotation_line__add(&dl->al,
¬es->src->source);
}
}
args->offset = pc;
args->line = buf + prev_buf_size;
args->line_nr = 0;
args->fileloc = NULL;
args->ms.sym = sym;
dl = disasm_line__new(args);
if (dl)
annotation_line__add(&dl->al, ¬es->src->source);
pc += count;
} while (count > 0 && pc < len);
ret = 0;
out:
free(prog_linfo);
btf__free(btf);
fclose(s);
bfd_close(bfdf);
return ret;
}
#else // defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
int symbol__disassemble_bpf(struct symbol *sym __maybe_unused, struct annotate_args *args __maybe_unused)
{
return SYMBOL_ANNOTATE_ERRNO__NO_LIBOPCODES_FOR_BPF;
}
#endif // defined(HAVE_LIBBFD_SUPPORT) && defined(HAVE_LIBBPF_SUPPORT)
int symbol__disassemble_bpf_image(struct symbol *sym, struct annotate_args *args)
{
struct annotation *notes = symbol__annotation(sym);
struct disasm_line *dl;
args->offset = -1;
args->line = strdup("to be implemented");
args->line_nr = 0;
args->fileloc = NULL;
dl = disasm_line__new(args);
if (dl)
annotation_line__add(&dl->al, ¬es->src->source);
zfree(&args->line);
return 0;
}
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