064360e667
libgcc for boot environment isn't always present and compatible. libgcc is often absent if endianness or bit-size at boot is different from running OS. libgcc may use optimised opcodes that aren't available on boot time. So instead of relying on libgcc shipped with the compiler, supply the functions in GRUB directly. Tests are present to ensure that those replacement functions behave the way compiler expects them to.
93 lines
2 KiB
C
93 lines
2 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/types.h>
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#include <grub/misc.h>
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#include <grub/decompressor.h>
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void *
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grub_memset (void *s, int c, grub_size_t len)
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{
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grub_uint8_t *ptr;
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for (ptr = s; len; ptr++, len--)
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*ptr = c;
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return s;
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}
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void *
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grub_memmove (void *dest, const void *src, grub_size_t n)
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{
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char *d = (char *) dest;
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const char *s = (const char *) src;
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if (d < s)
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while (n--)
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*d++ = *s++;
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else
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{
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d += n;
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s += n;
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while (n--)
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*--d = *--s;
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}
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return dest;
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}
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int
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grub_memcmp (const void *s1, const void *s2, grub_size_t n)
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{
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const unsigned char *t1 = s1;
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const unsigned char *t2 = s2;
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while (n--)
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{
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if (*t1 != *t2)
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return (int) *t1 - (int) *t2;
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t1++;
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t2++;
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}
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return 0;
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}
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void *grub_decompressor_scratch;
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void
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find_scratch (void *src, void *dst, unsigned long srcsize,
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unsigned long dstsize)
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{
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#ifdef _mips
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/* Decoding from ROM. */
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if (((grub_addr_t) src & 0x10000000))
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{
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grub_decompressor_scratch = (void *) ALIGN_UP((grub_addr_t) dst + dstsize,
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256);
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return;
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}
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#endif
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if ((char *) src + srcsize > (char *) dst + dstsize)
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grub_decompressor_scratch = (void *) ALIGN_UP ((grub_addr_t) src + srcsize,
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256);
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else
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grub_decompressor_scratch = (void *) ALIGN_UP ((grub_addr_t) dst + dstsize,
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256);
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return;
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}
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