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 ---

Changes wrt RFC: * support %p[ap] only under DEBUG * Add comparsion data w/o tiny printf to commit message.

lib/tiny-printf.c | 154 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 154 insertions(+)

diff --git a/lib/tiny-printf.c b/lib/tiny-printf.c index 6def8f98aa41..0b04813dc206 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: