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-rw-r--r--tools/net/bpf_jit_disasm.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/tools/net/bpf_jit_disasm.c b/tools/net/bpf_jit_disasm.c
index 544b05a53b70..ad572e6cdbd0 100644
--- a/tools/net/bpf_jit_disasm.c
+++ b/tools/net/bpf_jit_disasm.c
@@ -229,6 +229,7 @@ static void usage(void)
{
printf("Usage: bpf_jit_disasm [...]\n");
printf(" -o Also display related opcodes (default: off).\n");
+ printf(" -O <file> Write binary image of code to file, don't disassemble to stdout.\n");
printf(" -f <file> Read last image dump from file or stdin (default: klog).\n");
printf(" -h Display this help.\n");
}
@@ -238,12 +239,19 @@ int main(int argc, char **argv)
unsigned int len, klen, opt, opcodes = 0;
static uint8_t image[32768];
char *kbuff, *file = NULL;
+ char *ofile = NULL;
+ int ofd;
+ ssize_t nr;
+ uint8_t *pos;
- while ((opt = getopt(argc, argv, "of:")) != -1) {
+ while ((opt = getopt(argc, argv, "of:O:")) != -1) {
switch (opt) {
case 'o':
opcodes = 1;
break;
+ case 'O':
+ ofile = optarg;
+ break;
case 'f':
file = optarg;
break;
@@ -263,11 +271,35 @@ int main(int argc, char **argv)
}
len = get_last_jit_image(kbuff, klen, image, sizeof(image));
- if (len > 0)
- get_asm_insns(image, len, opcodes);
- else
+ if (len <= 0) {
fprintf(stderr, "No JIT image found!\n");
+ goto done;
+ }
+ if (!ofile) {
+ get_asm_insns(image, len, opcodes);
+ goto done;
+ }
+
+ ofd = open(ofile, O_WRONLY | O_CREAT | O_TRUNC, DEFFILEMODE);
+ if (ofd < 0) {
+ fprintf(stderr, "Could not open file %s for writing: ", ofile);
+ perror(NULL);
+ goto done;
+ }
+ pos = image;
+ do {
+ nr = write(ofd, pos, len);
+ if (nr < 0) {
+ fprintf(stderr, "Could not write data to %s: ", ofile);
+ perror(NULL);
+ goto done;
+ }
+ len -= nr;
+ pos += nr;
+ } while (len);
+ close(ofd);
+done:
put_log_buff(kbuff);
return 0;
}