535c611ddd
Our memcpy and memcmp variants were implemented by calling the corresponding gcc builtin variants. However gcc is free to replace a call to __builtin_memcmp with a call to memcmp which, when called, will result in an endless recursion within memcmp. So let's provide asm variants and also fix the variants that are used for uncompressing the kernel image. In addition remove all other occurences of builtin function calls. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
172 lines
3.6 KiB
C
172 lines
3.6 KiB
C
/*
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* Definitions and wrapper functions for kernel decompressor
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*
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* Copyright IBM Corp. 2010
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*
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include <asm/ipl.h>
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#include "sizes.h"
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/*
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* gzip declarations
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*/
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#define STATIC static
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#undef memset
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#undef memcpy
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#undef memmove
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#define memmove memmove
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#define memzero(s, n) memset((s), 0, (n))
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/* Symbols defined by linker scripts */
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extern char input_data[];
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extern int input_len;
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extern char _text, _end;
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extern char _bss, _ebss;
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static void error(char *m);
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static unsigned long free_mem_ptr;
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static unsigned long free_mem_end_ptr;
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#ifdef CONFIG_HAVE_KERNEL_BZIP2
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#define HEAP_SIZE 0x400000
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#else
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#define HEAP_SIZE 0x10000
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#endif
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#ifdef CONFIG_KERNEL_GZIP
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#include "../../../../lib/decompress_inflate.c"
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#endif
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#ifdef CONFIG_KERNEL_BZIP2
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#include "../../../../lib/decompress_bunzip2.c"
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#endif
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#ifdef CONFIG_KERNEL_LZMA
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#include "../../../../lib/decompress_unlzma.c"
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#endif
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#ifdef CONFIG_KERNEL_LZO
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#include "../../../../lib/decompress_unlzo.c"
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#endif
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#ifdef CONFIG_KERNEL_XZ
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#include "../../../../lib/decompress_unxz.c"
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#endif
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extern _sclp_print_early(const char *);
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static int puts(const char *s)
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{
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_sclp_print_early(s);
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return 0;
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}
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void *memset(void *s, int c, size_t n)
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{
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char *xs;
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xs = s;
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while (n--)
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*xs++ = c;
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return s;
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}
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void *memcpy(void *dest, const void *src, size_t n)
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{
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const char *s = src;
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char *d = dest;
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while (n--)
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*d++ = *s++;
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return dest;
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}
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void *memmove(void *dest, const void *src, size_t n)
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{
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const char *s = src;
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char *d = dest;
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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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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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static void error(char *x)
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{
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unsigned long long psw = 0x000a0000deadbeefULL;
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puts("\n\n");
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puts(x);
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puts("\n\n -- System halted");
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asm volatile("lpsw %0" : : "Q" (psw));
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}
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/*
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* Safe guard the ipl parameter block against a memory area that will be
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* overwritten. The validity check for the ipl parameter block is complex
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* (see cio_get_iplinfo and ipl_save_parameters) but if the pointer to
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* the ipl parameter block intersects with the passed memory area we can
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* safely assume that we can read from that memory. In that case just copy
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* the memory to IPL_PARMBLOCK_ORIGIN even if there is no ipl parameter
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* block.
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*/
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static void check_ipl_parmblock(void *start, unsigned long size)
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{
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void *src, *dst;
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src = (void *)(unsigned long) S390_lowcore.ipl_parmblock_ptr;
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if (src + PAGE_SIZE <= start || src >= start + size)
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return;
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dst = (void *) IPL_PARMBLOCK_ORIGIN;
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memmove(dst, src, PAGE_SIZE);
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S390_lowcore.ipl_parmblock_ptr = IPL_PARMBLOCK_ORIGIN;
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}
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unsigned long decompress_kernel(void)
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{
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unsigned long output_addr;
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unsigned char *output;
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output_addr = ((unsigned long) &_end + HEAP_SIZE + 4095UL) & -4096UL;
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check_ipl_parmblock((void *) 0, output_addr + SZ__bss_start);
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memset(&_bss, 0, &_ebss - &_bss);
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free_mem_ptr = (unsigned long)&_end;
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free_mem_end_ptr = free_mem_ptr + HEAP_SIZE;
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output = (unsigned char *) output_addr;
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#ifdef CONFIG_BLK_DEV_INITRD
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/*
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* Move the initrd right behind the end of the decompressed
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* kernel image.
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*/
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if (INITRD_START && INITRD_SIZE &&
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INITRD_START < (unsigned long) output + SZ__bss_start) {
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check_ipl_parmblock(output + SZ__bss_start,
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INITRD_START + INITRD_SIZE);
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memmove(output + SZ__bss_start,
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(void *) INITRD_START, INITRD_SIZE);
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INITRD_START = (unsigned long) output + SZ__bss_start;
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}
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#endif
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puts("Uncompressing Linux... ");
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decompress(input_data, input_len, NULL, NULL, output, NULL, error);
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puts("Ok, booting the kernel.\n");
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return (unsigned long) output;
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}
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