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authorVignesh R <vigneshr@ti.com>2017-04-10 12:23:22 +0530
committerTom Rini <trini@konsulko.com>2017-04-13 09:41:09 -0400
commitcdce1f762029619e80061833b153cdbf3d0a0860 (patch)
tree0c87305ad6c815383760cd8f54088aa938fd5d8d
parentb997a73ee63170579c3708a765d234f17f8effac (diff)
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tiny-printf: Add support for %p format
Add support for %p, %pa[p], %pM, %pm and %pI4 formats to tiny-printf. %pM and %pI4 are widely used by SPL networking stack and is required if networking support is desired in SPL. %p, %pa and %pap are mostly used by debug prints and hence supported only when DEBUG is enabled. Before this patch: $ size spl/u-boot-spl text data bss dec hex filename 99325 4899 218584 322808 4ecf8 spl/u-boot-spl After this patch (with CONFIG_SPL_NET_SUPPORT): $ size spl/u-boot-spl text data bss dec hex filename 99666 4899 218584 323149 4ee4d spl/u-boot-spl So, this patch adds ~350 bytes to code size. If CONFIG_SPL_NET_SUPPORT is not enabled, this adds ~25 bytes. If CONFIG_USE_TINY_PRINTF is disabled then: $ size spl/u-boot-spl text data bss dec hex filename 101116 4899 218584 324599 4f3f7 spl/u-boot-spl So, there is still ~1.4K space saved even with support for %pM/%pI4. Compiler used is to build is: arm-linux-gnueabihf-gcc (Linaro GCC 6.2-2016.11) 6.2.1 20161016 Signed-off-by: Vignesh R <vigneshr@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org>
-rw-r--r--lib/tiny-printf.c154
1 files changed, 154 insertions, 0 deletions
diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c
index 6def8f9..0b04813 100644
--- a/lib/tiny-printf.c
+++ b/lib/tiny-printf.c
@@ -12,6 +12,7 @@
#include <common.h>
#include <stdarg.h>
#include <serial.h>
+#include <linux/ctype.h>
struct printf_info {
char *bf; /* Digit buffer */
@@ -52,6 +53,154 @@ static void div_out(struct printf_info *info, unsigned long *num,
out_dgt(info, dgt);
}
+#ifdef CONFIG_SPL_NET_SUPPORT
+static void string(struct printf_info *info, char *s)
+{
+ char ch;
+
+ while ((ch = *s++))
+ out(info, ch);
+}
+
+static const char hex_asc[] = "0123456789abcdef";
+#define hex_asc_lo(x) hex_asc[((x) & 0x0f)]
+#define hex_asc_hi(x) hex_asc[((x) & 0xf0) >> 4]
+
+static inline char *pack_hex_byte(char *buf, u8 byte)
+{
+ *buf++ = hex_asc_hi(byte);
+ *buf++ = hex_asc_lo(byte);
+ return buf;
+}
+
+static void mac_address_string(struct printf_info *info, u8 *addr,
+ bool separator)
+{
+ /* (6 * 2 hex digits), 5 colons and trailing zero */
+ char mac_addr[6 * 3];
+ char *p = mac_addr;
+ int i;
+
+ for (i = 0; i < 6; i++) {
+ p = pack_hex_byte(p, addr[i]);
+ if (separator && i != 5)
+ *p++ = ':';
+ }
+ *p = '\0';
+
+ string(info, mac_addr);
+}
+
+static char *put_dec_trunc(char *buf, unsigned int q)
+{
+ unsigned int d3, d2, d1, d0;
+ d1 = (q >> 4) & 0xf;
+ d2 = (q >> 8) & 0xf;
+ d3 = (q >> 12);
+
+ d0 = 6 * (d3 + d2 + d1) + (q & 0xf);
+ q = (d0 * 0xcd) >> 11;
+ d0 = d0 - 10 * q;
+ *buf++ = d0 + '0'; /* least significant digit */
+ d1 = q + 9 * d3 + 5 * d2 + d1;
+ if (d1 != 0) {
+ q = (d1 * 0xcd) >> 11;
+ d1 = d1 - 10 * q;
+ *buf++ = d1 + '0'; /* next digit */
+
+ d2 = q + 2 * d2;
+ if ((d2 != 0) || (d3 != 0)) {
+ q = (d2 * 0xd) >> 7;
+ d2 = d2 - 10 * q;
+ *buf++ = d2 + '0'; /* next digit */
+
+ d3 = q + 4 * d3;
+ if (d3 != 0) {
+ q = (d3 * 0xcd) >> 11;
+ d3 = d3 - 10 * q;
+ *buf++ = d3 + '0'; /* next digit */
+ if (q != 0)
+ *buf++ = q + '0'; /* most sign. digit */
+ }
+ }
+ }
+ return buf;
+}
+
+static void ip4_addr_string(struct printf_info *info, u8 *addr)
+{
+ /* (4 * 3 decimal digits), 3 dots and trailing zero */
+ char ip4_addr[4 * 4];
+ char temp[3]; /* hold each IP quad in reverse order */
+ char *p = ip4_addr;
+ int i, digits;
+
+ for (i = 0; i < 4; i++) {
+ digits = put_dec_trunc(temp, addr[i]) - temp;
+ /* reverse the digits in the quad */
+ while (digits--)
+ *p++ = temp[digits];
+ if (i != 3)
+ *p++ = '.';
+ }
+ *p = '\0';
+
+ string(info, ip4_addr);
+}
+#endif
+
+/*
+ * Show a '%p' thing. A kernel extension is that the '%p' is followed
+ * by an extra set of characters that are extended format
+ * specifiers.
+ *
+ * Right now we handle:
+ *
+ * - 'M' For a 6-byte MAC address, it prints the address in the
+ * usual colon-separated hex notation.
+ * - 'm' Same as above except there is no colon-separator.
+ * - 'I4'for IPv4 addresses printed in the usual way (dot-separated
+ * decimal).
+ */
+
+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:
+ num = *(phys_addr_t *)ptr;
+ break;
+ }
+ break;
+#endif
+#ifdef CONFIG_SPL_NET_SUPPORT
+ case 'm':
+ return mac_address_string(info, ptr, false);
+ case 'M':
+ return mac_address_string(info, ptr, true);
+ case 'I':
+ if (fmt[1] == '4')
+ return ip4_addr_string(info, ptr);
+#endif
+ default:
+ break;
+ }
+#ifdef DEBUG
+ div = 1UL << (sizeof(long) * 8 - 4);
+ for (; div; div /= 0x10)
+ div_out(info, &num, div);
+#endif
+}
+
static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
{
char ch;
@@ -144,6 +293,11 @@ static int _vprintf(struct printf_info *info, const char *fmt, va_list va)
case 's':
p = va_arg(va, char*);
break;
+ case 'p':
+ pointer(info, fmt, va_arg(va, void *));
+ while (isalnum(fmt[0]))
+ fmt++;
+ break;
case '%':
out(info, '%');
default: