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libspl/backtrace: dump registers in libunwind backtraces

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More useful stuff, especially when trying to follow a disassembly.

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #16653
This commit is contained in:
Rob Norris 2024-10-15 22:18:19 +11:00 committed by Brian Behlendorf
parent 27e8f56102
commit 0a001f3088
1 changed files with 35 additions and 9 deletions
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44
lib/libspl/backtrace.c
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@ -65,32 +65,58 @@ libspl_backtrace(int fd)
ssize_t ret __attribute__((unused));
unw_context_t uc;
unw_cursor_t cp;
unw_word_t loc;
unw_word_t v;
char buf[128];
size_t n;
size_t n, c;
ret = write(fd, "Call trace:\n", 12);
unw_getcontext(&uc);
unw_init_local(&cp, &uc);
ret = write(fd, "Registers:\n", 11);
c = 0;
for (uint_t regnum = 0; regnum <= UNW_TDEP_LAST_REG; regnum++) {
if (unw_get_reg(&cp, regnum, &v) < 0)
continue;
const char *name = unw_regname(regnum);
for (n = 0; name[n] != '\0' && name[n] != '?'; n++) {}
if (n == 0) {
buf[0] = '?';
n = libspl_u64_to_hex_str(regnum, 2,
&buf[1], sizeof (buf)-1) + 1;
name = buf;
}
ret = write(fd, " ", 5-MIN(n, 3));
ret = write(fd, name, n);
ret = write(fd, ": 0x", 4);
n = libspl_u64_to_hex_str(v, 18, buf, sizeof (buf));
ret = write(fd, buf, n);
if (!(++c % 3))
ret = write(fd, "\n", 1);
}
if (c % 3)
ret = write(fd, "\n", 1);
unw_init_local(&cp, &uc);
ret = write(fd, "Call trace:\n", 12);
while (unw_step(&cp) > 0) {
unw_get_reg(&cp, UNW_REG_IP, &loc);
unw_get_reg(&cp, UNW_REG_IP, &v);
ret = write(fd, " [0x", 5);
n = libspl_u64_to_hex_str(loc, 10, buf, sizeof (buf));
n = libspl_u64_to_hex_str(v, 18, buf, sizeof (buf));
ret = write(fd, buf, n);
ret = write(fd, "] ", 2);
unw_get_proc_name(&cp, buf, sizeof (buf), &loc);
unw_get_proc_name(&cp, buf, sizeof (buf), &v);
for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {}
ret = write(fd, buf, n);
ret = write(fd, "+0x", 3);
n = libspl_u64_to_hex_str(loc, 2, buf, sizeof (buf));
n = libspl_u64_to_hex_str(v, 2, buf, sizeof (buf));
ret = write(fd, buf, n);
#ifdef HAVE_LIBUNWIND_ELF
ret = write(fd, " (in ", 5);
unw_get_elf_filename(&cp, buf, sizeof (buf), &loc);
unw_get_elf_filename(&cp, buf, sizeof (buf), &v);
for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {}
ret = write(fd, buf, n);
ret = write(fd, " +0x", 4);
n = libspl_u64_to_hex_str(loc, 2, buf, sizeof (buf));
n = libspl_u64_to_hex_str(v, 2, buf, sizeof (buf));
ret = write(fd, buf, n);
ret = write(fd, ")", 1);
#endif