tiny-printf: Handle formatting of %p with an extra Kconfig
The formatting with %pa / %pap behaves like %x, which results in an
incorrect value being output. To improve this, a new fine-tuning
Kconfig SPL_USE_TINY_PRINTF_POINTER_SUPPORT for pointer formatting
has been added. If it is enabled, the output of %pa / %pap should
be correct, and if it is disabled, the pointer formatting is
completely unsupported. In addition to indicate unsupported formatting,
'?' will be output. This allows enabling pointer formatting only
when needed. For SPL_NET it is selected by default. Then it also
supports the formatting with %pm, %pM and %pI4.
In summery this level of %p support for tiny printf is possible now:
1) The standard tiny printf won't have support for pointer formatting.
So it doesn't print misleading values for %pa, instead '?' will be
output:
%p => ?
%pa => ?a
%pap => ?ap
2) If SPL_USE_TINY_PRINTF_POINTER_SUPPORT is enabled or DEBUG is defined
tiny printf supports formatting %p and %pa / %pap.
3) If SPL_NET is enabled the support of pointers is extended
for %pm, %pM and %pI4.
Signed-off-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index aa3a85e..a84a0f8 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1123,6 +1123,7 @@
config SPL_NET
bool "Support networking"
depends on !NET_LWIP
+ select SPL_USE_TINY_PRINTF_POINTER_SUPPORT if SPL_USE_TINY_PRINTF
help
Enable support for network devices (such as Ethernet) in SPL.
This permits SPL to load U-Boot over a network link rather than
diff --git a/lib/Kconfig b/lib/Kconfig
index b2aecd8..cdf8f7e 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -253,6 +253,14 @@
The supported format specifiers are %c, %s, %u/%d and %x.
+config SPL_USE_TINY_PRINTF_POINTER_SUPPORT
+ bool "Extend tiny printf with the pointer formatting %p"
+ depends on SPL_USE_TINY_PRINTF
+ help
+ This option enables the formatting of pointers %p. It supports
+ %p and %pa / %pap. If this option is selected by SPL_NET
+ it also supports the formatting with %pm, %pM and %pI4.
+
config PANIC_HANG
bool "Do not reset the system on fatal error"
help
diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index 2a7a4d2..411ae61 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -141,7 +141,7 @@
string(info, ip4_addr);
}
-#endif
+#endif /* CONFIG_SPL_NET */
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
@@ -157,18 +157,14 @@
* decimal).
*/
-static void __maybe_unused pointer(struct printf_info *info, const char *fmt,
- void *ptr)
+#if defined(CONFIG_SPL_USE_TINY_PRINTF_POINTER_SUPPORT) || defined(DEBUG)
+static void pointer(struct printf_info *info, const char *fmt, void *ptr)
{
-#ifdef DEBUG
unsigned long num = (uintptr_t)ptr;
unsigned long div;
-#endif
switch (*fmt) {
-#ifdef DEBUG
case 'a':
-
switch (fmt[1]) {
case 'p':
default:
@@ -176,7 +172,6 @@
break;
}
break;
-#endif
#ifdef CONFIG_SPL_NET
case 'm':
return mac_address_string(info, ptr, false);
@@ -185,16 +180,22 @@
case 'I':
if (fmt[1] == '4')
return ip4_addr_string(info, ptr);
+#else
+ case 'm':
+ case 'M':
+ case 'I':
+ out(info, '?');
+ return;
#endif
default:
break;
}
-#ifdef DEBUG
+
div = 1UL << (sizeof(long) * 8 - 4);
for (; div; div /= 0x10)
div_out(info, &num, div);
-#endif
}
+#endif
static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
{
@@ -269,21 +270,18 @@
div_out(info, &num, div);
}
break;
+#if defined(CONFIG_SPL_USE_TINY_PRINTF_POINTER_SUPPORT) || defined(DEBUG)
case 'p':
- if (CONFIG_IS_ENABLED(NET) ||
- CONFIG_IS_ENABLED(NET_LWIP) || _DEBUG) {
- pointer(info, fmt, va_arg(va, void *));
- /*
- * Skip this because it pulls in _ctype which is
- * 256 bytes, and we don't generally implement
- * pointer anyway
- */
- while (isalnum(fmt[0]))
- fmt++;
- break;
- }
- islong = true;
- fallthrough;
+ pointer(info, fmt, va_arg(va, void *));
+ /*
+ * Skip this because it pulls in _ctype which is
+ * 256 bytes, and we don't generally implement
+ * pointer anyway
+ */
+ while (isalnum(fmt[0]))
+ fmt++;
+ break;
+#endif
case 'x':
case 'X':
if (islong) {
@@ -310,7 +308,9 @@
break;
case '%':
out(info, '%');
+ break;
default:
+ out(info, '?');
break;
}