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libspl/backtrace: rename and document hex conversion function

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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 2024-10-18 14:30:05 +11:00 committed by Brian Behlendorf
parent c7e47b3d9a
commit 2596a75306
1 changed files with 13 additions and 8 deletions
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21
lib/libspl/backtrace.c
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@ -44,8 +44,13 @@
#define UNW_LOCAL_ONLY #define UNW_LOCAL_ONLY
#include <libunwind.h> #include <libunwind.h>
/*
* Convert `v` to ASCII hex characters. The bottom `n` nybbles (4-bits ie one
* hex digit) will be written, up to `buflen`. The buffer will not be
* null-terminated. Returns the number of digits written.
*/
static size_t static size_t
libspl_u64_to_hex_str(uint64_t v, size_t digits, char *buf, size_t buflen) spl_bt_u64_to_hex_str(uint64_t v, size_t n, char *buf, size_t buflen)
{ {
static const char hexdigits[] = { static const char hexdigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '0', '1', '2', '3', '4', '5', '6', '7',
@ -53,10 +58,10 @@ libspl_u64_to_hex_str(uint64_t v, size_t digits, char *buf, size_t buflen)
}; };
size_t pos = 0; size_t pos = 0;
boolean_t want = (digits == 0); boolean_t want = (n == 0);
for (int i = 15; i >= 0; i--) { for (int i = 15; i >= 0; i--) {
const uint64_t d = v >> (i * 4) & 0xf; const uint64_t d = v >> (i * 4) & 0xf;
if (!want && (d != 0 || digits > i)) if (!want && (d != 0 || n > i))
want = B_TRUE; want = B_TRUE;
if (want) { if (want) {
buf[pos++] = hexdigits[d]; buf[pos++] = hexdigits[d];
@ -88,14 +93,14 @@ libspl_backtrace(int fd)
for (n = 0; name[n] != '\0' && name[n] != '?'; n++) {} for (n = 0; name[n] != '\0' && name[n] != '?'; n++) {}
if (n == 0) { if (n == 0) {
buf[0] = '?'; buf[0] = '?';
n = libspl_u64_to_hex_str(regnum, 2, n = spl_bt_u64_to_hex_str(regnum, 2,
&buf[1], sizeof (buf)-1) + 1; &buf[1], sizeof (buf)-1) + 1;
name = buf; name = buf;
} }
spl_bt_write_n(fd, " ", 5-MIN(n, 3)); spl_bt_write_n(fd, " ", 5-MIN(n, 3));
spl_bt_write_n(fd, name, n); spl_bt_write_n(fd, name, n);
spl_bt_write(fd, ": 0x"); spl_bt_write(fd, ": 0x");
n = libspl_u64_to_hex_str(v, 18, buf, sizeof (buf)); n = spl_bt_u64_to_hex_str(v, 18, buf, sizeof (buf));
spl_bt_write_n(fd, buf, n); spl_bt_write_n(fd, buf, n);
if (!(++c % 3)) if (!(++c % 3))
spl_bt_write(fd, "\n"); spl_bt_write(fd, "\n");
@ -108,14 +113,14 @@ libspl_backtrace(int fd)
while (unw_step(&cp) > 0) { while (unw_step(&cp) > 0) {
unw_get_reg(&cp, UNW_REG_IP, &v); unw_get_reg(&cp, UNW_REG_IP, &v);
spl_bt_write(fd, " [0x"); spl_bt_write(fd, " [0x");
n = libspl_u64_to_hex_str(v, 18, buf, sizeof (buf)); n = spl_bt_u64_to_hex_str(v, 18, buf, sizeof (buf));
spl_bt_write_n(fd, buf, n); spl_bt_write_n(fd, buf, n);
spl_bt_write(fd, "] "); spl_bt_write(fd, "] ");
unw_get_proc_name(&cp, buf, sizeof (buf), &v); unw_get_proc_name(&cp, buf, sizeof (buf), &v);
for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {} for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {}
spl_bt_write_n(fd, buf, n); spl_bt_write_n(fd, buf, n);
spl_bt_write(fd, "+0x"); spl_bt_write(fd, "+0x");
n = libspl_u64_to_hex_str(v, 2, buf, sizeof (buf)); n = spl_bt_u64_to_hex_str(v, 2, buf, sizeof (buf));
spl_bt_write_n(fd, buf, n); spl_bt_write_n(fd, buf, n);
#ifdef HAVE_LIBUNWIND_ELF #ifdef HAVE_LIBUNWIND_ELF
spl_bt_write(fd, " (in "); spl_bt_write(fd, " (in ");
@ -123,7 +128,7 @@ libspl_backtrace(int fd)
for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {} for (n = 0; n < sizeof (buf) && buf[n] != '\0'; n++) {}
spl_bt_write_n(fd, buf, n); spl_bt_write_n(fd, buf, n);
spl_bt_write(fd, " +0x"); spl_bt_write(fd, " +0x");
n = libspl_u64_to_hex_str(v, 2, buf, sizeof (buf)); n = spl_bt_u64_to_hex_str(v, 2, buf, sizeof (buf));
spl_bt_write_n(fd, buf, n); spl_bt_write_n(fd, buf, n);
spl_bt_write(fd, ")"); spl_bt_write(fd, ")");
#endif #endif