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efi/libstub: Add a basic printf implementation
Copy vsprintf from arch/x86/boot/printf.c to get a simple printf implementation. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Link: https://lore.kernel.org/r/20200518190716.751506-5-nivedita@alum.mit.edu [ardb: add some missing braces in if...else clauses] Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Arvind Sankar
Ard Biesheuvel
parent
fd0528a249
commit
2c7d1e30e5
@ -44,7 +44,7 @@ KCOV_INSTRUMENT := n
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lib-y := efi-stub-helper.o gop.o secureboot.o tpm.o \
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file.o mem.o random.o randomalloc.o pci.o \
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skip_spaces.o lib-cmdline.o lib-ctype.o \
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alignedmem.o relocate.o
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alignedmem.o relocate.o vsprintf.o
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# include the stub's generic dependencies from lib/ when building for ARM/arm64
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efi-deps-y := fdt_rw.c fdt_ro.c fdt_wip.c fdt.c fdt_empty_tree.c fdt_sw.c
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@ -7,6 +7,8 @@
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* Copyright 2011 Intel Corporation; author Matt Fleming
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*/
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#include <stdarg.h>
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#include <linux/efi.h>
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#include <linux/kernel.h>
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#include <asm/efi.h>
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@ -51,6 +53,21 @@ void efi_puts(const char *str)
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}
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}
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int efi_printk(const char *fmt, ...)
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{
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char printf_buf[256];
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va_list args;
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int printed;
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va_start(args, fmt);
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printed = vsprintf(printf_buf, fmt, args);
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va_end(args);
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efi_puts(printf_buf);
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return printed;
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}
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/*
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* Parse the ASCII string 'cmdline' for EFI options, denoted by the efi=
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* option, e.g. efi=nochunk.
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@ -3,6 +3,7 @@
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#ifndef _DRIVERS_FIRMWARE_EFI_EFISTUB_H
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#define _DRIVERS_FIRMWARE_EFI_EFISTUB_H
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#include <linux/compiler.h>
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#include <linux/efi.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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@ -632,6 +633,8 @@ void *get_efi_config_table(efi_guid_t guid);
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void efi_char16_puts(efi_char16_t *);
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void efi_puts(const char *str);
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__printf(1, 2) int efi_printk(char const *fmt, ...);
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void efi_free(unsigned long size, unsigned long addr);
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char *efi_convert_cmdline(efi_loaded_image_t *image, int *cmd_line_len,
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299
drivers/firmware/efi/libstub/vsprintf.c
Normal file
299
drivers/firmware/efi/libstub/vsprintf.c
Normal file
@ -0,0 +1,299 @@
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// SPDX-License-Identifier: GPL-2.0-only
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/* -*- linux-c -*- ------------------------------------------------------- *
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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* Copyright 2007 rPath, Inc. - All Rights Reserved
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*
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* ----------------------------------------------------------------------- */
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/*
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* Oh, it's a waste of space, but oh-so-yummy for debugging. This
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* version of printf() does not include 64-bit support. "Live with
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* it."
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*
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*/
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#include <stdarg.h>
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#include <linux/compiler.h>
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#include <linux/ctype.h>
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#include <linux/string.h>
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static int skip_atoi(const char **s)
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{
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int i = 0;
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while (isdigit(**s))
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i = i * 10 + *((*s)++) - '0';
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return i;
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}
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#define ZEROPAD 1 /* pad with zero */
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#define SIGN 2 /* unsigned/signed long */
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#define PLUS 4 /* show plus */
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#define SPACE 8 /* space if plus */
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#define LEFT 16 /* left justified */
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#define SMALL 32 /* Must be 32 == 0x20 */
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#define SPECIAL 64 /* 0x */
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#define __do_div(n, base) ({ \
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int __res; \
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__res = ((unsigned long) n) % (unsigned) base; \
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n = ((unsigned long) n) / (unsigned) base; \
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__res; })
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static char *number(char *str, long num, int base, int size, int precision,
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int type)
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{
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/* we are called with base 8, 10 or 16, only, thus don't need "G..." */
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static const char digits[16] = "0123456789ABCDEF"; /* "GHIJKLMNOPQRSTUVWXYZ"; */
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char tmp[66];
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char c, sign, locase;
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int i;
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/* locase = 0 or 0x20. ORing digits or letters with 'locase'
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* produces same digits or (maybe lowercased) letters */
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locase = (type & SMALL);
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if (type & LEFT)
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type &= ~ZEROPAD;
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if (base < 2 || base > 16)
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return NULL;
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c = (type & ZEROPAD) ? '0' : ' ';
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sign = 0;
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if (type & SIGN) {
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if (num < 0) {
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sign = '-';
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num = -num;
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size--;
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} else if (type & PLUS) {
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sign = '+';
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size--;
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} else if (type & SPACE) {
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sign = ' ';
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size--;
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}
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}
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if (type & SPECIAL) {
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if (base == 16)
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size -= 2;
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else if (base == 8)
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size--;
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}
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i = 0;
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if (num == 0)
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tmp[i++] = '0';
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else
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while (num != 0)
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tmp[i++] = (digits[__do_div(num, base)] | locase);
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if (i > precision)
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precision = i;
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size -= precision;
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if (!(type & (ZEROPAD + LEFT)))
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while (size-- > 0)
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*str++ = ' ';
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if (sign)
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*str++ = sign;
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if (type & SPECIAL) {
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if (base == 8) {
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*str++ = '0';
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} else if (base == 16) {
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*str++ = '0';
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*str++ = ('X' | locase);
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}
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}
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if (!(type & LEFT))
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while (size-- > 0)
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*str++ = c;
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while (i < precision--)
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*str++ = '0';
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while (i-- > 0)
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*str++ = tmp[i];
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while (size-- > 0)
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*str++ = ' ';
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return str;
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}
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int vsprintf(char *buf, const char *fmt, va_list args)
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{
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int len;
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unsigned long num;
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int i, base;
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char *str;
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const char *s;
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int flags; /* flags to number() */
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int field_width; /* width of output field */
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int precision; /* min. # of digits for integers; max
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number of chars for from string */
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int qualifier; /* 'h', 'l', or 'L' for integer fields */
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for (str = buf; *fmt; ++fmt) {
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if (*fmt != '%') {
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*str++ = *fmt;
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continue;
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}
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/* process flags */
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flags = 0;
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repeat:
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++fmt; /* this also skips first '%' */
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switch (*fmt) {
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case '-':
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flags |= LEFT;
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goto repeat;
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case '+':
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flags |= PLUS;
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goto repeat;
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case ' ':
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flags |= SPACE;
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goto repeat;
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case '#':
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flags |= SPECIAL;
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goto repeat;
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case '0':
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flags |= ZEROPAD;
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goto repeat;
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}
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/* get field width */
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field_width = -1;
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if (isdigit(*fmt)) {
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field_width = skip_atoi(&fmt);
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} else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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field_width = va_arg(args, int);
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if (field_width < 0) {
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field_width = -field_width;
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flags |= LEFT;
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}
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}
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/* get the precision */
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precision = -1;
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if (*fmt == '.') {
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++fmt;
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if (isdigit(*fmt)) {
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precision = skip_atoi(&fmt);
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} else if (*fmt == '*') {
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++fmt;
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/* it's the next argument */
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precision = va_arg(args, int);
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}
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if (precision < 0)
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precision = 0;
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}
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/* get the conversion qualifier */
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qualifier = -1;
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if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {
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qualifier = *fmt;
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++fmt;
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}
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/* default base */
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base = 10;
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switch (*fmt) {
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case 'c':
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if (!(flags & LEFT))
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while (--field_width > 0)
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*str++ = ' ';
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*str++ = (unsigned char)va_arg(args, int);
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while (--field_width > 0)
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*str++ = ' ';
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continue;
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case 's':
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s = va_arg(args, char *);
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len = strnlen(s, precision);
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if (!(flags & LEFT))
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while (len < field_width--)
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*str++ = ' ';
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for (i = 0; i < len; ++i)
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*str++ = *s++;
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while (len < field_width--)
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*str++ = ' ';
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continue;
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case 'p':
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if (field_width == -1) {
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field_width = 2 * sizeof(void *);
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flags |= ZEROPAD;
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}
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str = number(str,
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(unsigned long)va_arg(args, void *), 16,
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field_width, precision, flags);
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continue;
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case 'n':
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if (qualifier == 'l') {
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long *ip = va_arg(args, long *);
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*ip = (str - buf);
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} else {
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int *ip = va_arg(args, int *);
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*ip = (str - buf);
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}
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continue;
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case '%':
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*str++ = '%';
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continue;
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/* integer number formats - set up the flags and "break" */
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case 'o':
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base = 8;
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break;
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case 'x':
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flags |= SMALL;
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fallthrough;
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case 'X':
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base = 16;
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break;
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case 'd':
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case 'i':
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flags |= SIGN;
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fallthrough;
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case 'u':
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break;
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default:
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*str++ = '%';
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if (*fmt)
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*str++ = *fmt;
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else
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--fmt;
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continue;
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}
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if (qualifier == 'l') {
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num = va_arg(args, unsigned long);
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} else if (qualifier == 'h') {
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num = (unsigned short)va_arg(args, int);
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if (flags & SIGN)
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num = (short)num;
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} else if (flags & SIGN) {
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num = va_arg(args, int);
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} else {
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num = va_arg(args, unsigned int);
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}
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str = number(str, num, base, field_width, precision, flags);
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}
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*str = '\0';
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return str - buf;
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}
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int sprintf(char *buf, const char *fmt, ...)
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{
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va_list args;
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int i;
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va_start(args, fmt);
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i = vsprintf(buf, fmt, args);
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va_end(args);
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return i;
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}
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