a2ac1bb1f3
Using .bss in early code should be avoided. It might overlay initrd image or not yet be initialized. Clean up the last couple of places in the decompressor's code where .bss is used and enfore no .bss usage check on boot/compressed/misc.c. In particular: - initializing free_mem_ptr and free_mem_end_ptr with values guarantee that these variables won't end up in the .bss section. - define STATIC_RW_DATA to go into .data section. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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 <linux/uaccess.h>
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#include <asm/page.h>
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#include <asm/sclp.h>
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#include <asm/ipl.h>
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#include <asm/sections.h>
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#include "decompressor.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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#define STATIC_RW_DATA static __section(.data)
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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 _end[];
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extern unsigned char _compressed_start[];
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extern unsigned char _compressed_end[];
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static void error(char *m);
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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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static unsigned long free_mem_ptr = (unsigned long) _end;
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static unsigned long free_mem_end_ptr = (unsigned long) _end + HEAP_SIZE;
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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_LZ4
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#include "../../../../lib/decompress_unlz4.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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static int puts(const char *s)
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{
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sclp_early_printk(s);
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return 0;
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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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void *decompress_kernel(void)
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{
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void *output, *kernel_end;
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output = (void *) ALIGN((unsigned long) _end + HEAP_SIZE, PAGE_SIZE);
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kernel_end = output + vmlinux.image_size;
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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. This also prevents initrd corruption caused by
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* bss clearing since kernel_end will always be located behind the
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* current bss section..
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*/
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if (INITRD_START && INITRD_SIZE && kernel_end > (void *) INITRD_START) {
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memmove(kernel_end, (void *) INITRD_START, INITRD_SIZE);
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INITRD_START = (unsigned long) kernel_end;
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}
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#endif
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__decompress(_compressed_start, _compressed_end - _compressed_start,
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NULL, NULL, output, 0, NULL, error);
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return output;
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}
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