[PATCH] tiny-printf: Handle formatting of %p with an extra Kconfig
Christoph Niedermaier
cniedermaier at dh-electronics.com
Mon Apr 7 10:56:14 CEST 2025
The formatting with %pa / %pap behaves like %x, which results in an
incorrect value being output. To improve this, a new fine-tuning
Kconfig XPL_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 and NET_LWIP it is selected by default.
Then it also supports the formatting with %pm, %pM and %pI4.
Signed-off-by: Christoph Niedermaier <cniedermaier at dh-electronics.com>
---
Cc: Tom Rini <trini at konsulko.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Michael Walle <mwalle at kernel.org>
Cc: Quentin Schulz <quentin.schulz at cherry.de>
Cc: Marek Vasut <marex at denx.de>
Cc: Benedikt Spranger <b.spranger at linutronix.de>
Cc: Jerome Forissier <jerome.forissier at linaro.org>
Cc: John Ogness <john.ogness at linutronix.de>
Cc: Ilias Apalodimas <ilias.apalodimas at linaro.org>
---
Kconfig | 1 +
common/spl/Kconfig | 1 +
lib/Kconfig | 8 ++++++++
lib/tiny-printf.c | 45 +++++++++++++++++++--------------------------
4 files changed, 29 insertions(+), 26 deletions(-)
diff --git a/Kconfig b/Kconfig
index 6379a454166..4d13717294c 100644
--- a/Kconfig
+++ b/Kconfig
@@ -757,6 +757,7 @@ config NET
config NET_LWIP
bool "Use lwIP for networking stack"
+ select XPL_USE_TINY_PRINTF_POINTER_SUPPORT if SPL_USE_TINY_PRINTF || TPL_USE_TINY_PRINTF || VPL_USE_TINY_PRINTF
imply NETDEVICES
help
Include networking support based on the lwIP (lightweight IP)
diff --git a/common/spl/Kconfig b/common/spl/Kconfig
index 94e118f8465..72736dbecf5 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -1096,6 +1096,7 @@ config SPL_DM_SPI_FLASH
config SPL_NET
bool "Support networking"
depends on !NET_LWIP
+ select XPL_USE_TINY_PRINTF_POINTER_SUPPORT if SPL_USE_TINY_PRINTF || TPL_USE_TINY_PRINTF || VPL_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 1a683dea670..62e28d4a1f3 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -253,6 +253,14 @@ config VPL_USE_TINY_PRINTF
The supported format specifiers are %c, %s, %u/%d and %x.
+config XPL_USE_TINY_PRINTF_POINTER_SUPPORT
+ bool "Extend tiny printf with the pointer formatting %p"
+ depends on SPL_USE_TINY_PRINTF || TPL_USE_TINY_PRINTF || VPL_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 or NET_LWIP
+ 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 0503c17341f..10db812567a 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -47,7 +47,7 @@ static void div_out(struct printf_info *info, unsigned long *num,
out_dgt(info, dgt);
}
-#ifdef CONFIG_SPL_NET
+#if defined(CONFIG_SPL_NET) || defined(CONFIG_NET_LWIP)
static void string(struct printf_info *info, char *s)
{
char ch;
@@ -141,7 +141,7 @@ static void ip4_addr_string(struct printf_info *info, u8 *addr)
string(info, ip4_addr);
}
-#endif
+#endif /* defined(CONFIG_SPL_NET) || defined(CONFIG_NET_LWIP) */
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
@@ -157,18 +157,14 @@ static void ip4_addr_string(struct printf_info *info, u8 *addr)
* decimal).
*/
-static void __maybe_unused pointer(struct printf_info *info, const char *fmt,
- void *ptr)
+#if defined(CONFIG_XPL_USE_TINY_PRINTF_POINTER_SUPPORT) || _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:
@@ -176,8 +172,7 @@ static void __maybe_unused pointer(struct printf_info *info, const char *fmt,
break;
}
break;
-#endif
-#ifdef CONFIG_SPL_NET
+#if defined(CONFIG_SPL_NET) || defined(CONFIG_NET_LWIP)
case 'm':
return mac_address_string(info, ptr, false);
case 'M':
@@ -189,12 +184,12 @@ static void __maybe_unused pointer(struct printf_info *info, const char *fmt,
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)
{
@@ -268,21 +263,18 @@ static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
div_out(info, &num, div);
}
break;
+#if defined(CONFIG_XPL_USE_TINY_PRINTF_POINTER_SUPPORT) || _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;
- /* no break */
+ 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':
if (islong) {
num = va_arg(va, unsigned long);
@@ -307,6 +299,7 @@ static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
case '%':
out(info, '%');
default:
+ out(info, '?');
break;
}
--
2.30.2
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