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fix x86 lzma loader

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7322 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd 2007-05-23 23:29:09 +00:00
parent 9e86b41ee9
commit c858d52495
1 changed files with 184 additions and 221 deletions
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405
target/linux/generic-2.6/patches/600-x86_lzma.patch
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@ -695,47 +695,136 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/LzmaDecode.h linux-2.6.21.1-o
diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-owrt/arch/i386/boot/compressed/lzma_misc.c
--- linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.21.1-owrt/arch/i386/boot/compressed/lzma_misc.c 2007-05-14 11:55:38.000000000 +0200
@@ -0,0 +1,412 @@
@@ -0,0 +1,374 @@
+/*
+ * lzma_misc.c
+ *
+ * malloc by Hannu Savolainen 1993 and Matthias Urlichs 1994
+ * puts by Nick Holloway 1993, better puts by Martin Mares 1995
+ * High loaded stuff by Hans Lermen & Werner Almesberger, Feb. 1996
+ *
+ * Decompress LZMA compressed vmlinuz
+ * Version 0.9 Copyright (c) Ming-Ching Tiew mctiew@yahoo.com
+ * Program adapted from misc.c for 2.6 kernel
+ * Date: 3 June 2005
+ * Source released under GPL
+ * Forward ported to latest 2.6 version of misc.c by
+ * Felix Fietkau <nbd@openwrt.org>
+ */
+
+#undef CONFIG_PARAVIRT
+#include <linux/linkage.h>
+#include <linux/vmalloc.h>
+#include <linux/tty.h>
+#include <linux/screen_info.h>
+#include <asm/io.h>
+#include <asm/page.h>
+#include <asm/boot.h>
+
+/* WARNING!!
+ * This code is compiled with -fPIC and it is relocated dynamically
+ * at run time, but no relocation processing is performed.
+ * This means that it is not safe to place pointers in static structures.
+ */
+
+/*
+ * Getting to provable safe in place decompression is hard.
+ * Worst case behaviours need to be analized.
+ * Background information:
+ *
+ * The file layout is:
+ * magic[2]
+ * method[1]
+ * flags[1]
+ * timestamp[4]
+ * extraflags[1]
+ * os[1]
+ * compressed data blocks[N]
+ * crc[4] orig_len[4]
+ *
+ * resulting in 18 bytes of non compressed data overhead.
+ *
+ * Files divided into blocks
+ * 1 bit (last block flag)
+ * 2 bits (block type)
+ *
+ * 1 block occurs every 32K -1 bytes or when there 50% compression has been achieved.
+ * The smallest block type encoding is always used.
+ *
+ * stored:
+ * 32 bits length in bytes.
+ *
+ * fixed:
+ * magic fixed tree.
+ * symbols.
+ *
+ * dynamic:
+ * dynamic tree encoding.
+ * symbols.
+ *
+ *
+ * The buffer for decompression in place is the length of the
+ * uncompressed data, plus a small amount extra to keep the algorithm safe.
+ * The compressed data is placed at the end of the buffer. The output
+ * pointer is placed at the start of the buffer and the input pointer
+ * is placed where the compressed data starts. Problems will occur
+ * when the output pointer overruns the input pointer.
+ *
+ * The output pointer can only overrun the input pointer if the input
+ * pointer is moving faster than the output pointer. A condition only
+ * triggered by data whose compressed form is larger than the uncompressed
+ * form.
+ *
+ * The worst case at the block level is a growth of the compressed data
+ * of 5 bytes per 32767 bytes.
+ *
+ * The worst case internal to a compressed block is very hard to figure.
+ * The worst case can at least be boundined by having one bit that represents
+ * 32764 bytes and then all of the rest of the bytes representing the very
+ * very last byte.
+ *
+ * All of which is enough to compute an amount of extra data that is required
+ * to be safe. To avoid problems at the block level allocating 5 extra bytes
+ * per 32767 bytes of data is sufficient. To avoind problems internal to a block
+ * adding an extra 32767 bytes (the worst case uncompressed block size) is
+ * sufficient, to ensure that in the worst case the decompressed data for
+ * block will stop the byte before the compressed data for a block begins.
+ * To avoid problems with the compressed data's meta information an extra 18
+ * bytes are needed. Leading to the formula:
+ *
+ * extra_bytes = (uncompressed_size >> 12) + 32768 + 18 + decompressor_size.
+ *
+ * Adding 8 bytes per 32K is a bit excessive but much easier to calculate.
+ * Adding 32768 instead of 32767 just makes for round numbers.
+ * Adding the decompressor_size is necessary as it musht live after all
+ * of the data as well. Last I measured the decompressor is about 14K.
+ * 10K of actuall data and 4K of bss.
+ *
+ */
+
+/*
+ * gzip declarations
+ */
+
+#define OF(args) args
+#define STATIC static
+
+#undef memset
+#undef memcpy
+
+/*
+ * Why do we do this? Don't ask me..
+ *
+ * Incomprehensible are the ways of bootloaders.
+ */
+static void* memcpy(void *, __const void *, size_t);
+
+typedef unsigned char uch;
+typedef unsigned short ush;
+typedef unsigned long ulg;
+
+#define WSIZE 0x8000 /* Window size must be at least 32k, */
+ /* and a power of two */
+#define WSIZE 0x80000000 /* Window size must be at least 32k,
+ * and a power of two
+ * We don't actually have a window just
+ * a huge output buffer so I report
+ * a 2G windows size, as that should
+ * always be larger than our output buffer.
+ */
+
+static uch *inbuf; /* input buffer */
+static uch *inbuf; /* input buffer */
+static uch *window; /* Sliding window buffer, (and final output buffer) */
+
+static unsigned insize = 0; /* valid bytes in inbuf */
+static unsigned inptr = 0; /* index of next byte to be processed in inbuf */
+static unsigned insize; /* valid bytes in inbuf */
+static unsigned inptr; /* index of next byte to be processed in inbuf */
+
+#define get_byte() (inptr < insize ? inbuf[inptr++] : fill_inbuf())
+
@ -757,7 +846,6 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+#endif
+
+static int fill_inbuf(void);
+static void error(char *m);
+
+/*
+ * This is set up by the setup-routine at boot-time
@ -770,30 +858,23 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+#endif
+#define RM_SCREEN_INFO (*(struct screen_info *)(real_mode+0))
+
+extern char input_data[];
+extern unsigned char input_data[];
+extern int input_len;
+
+static long bytes_out = 0;
+static uch *output_data;
+static void error(char *x);
+static void *memcpy(void *dest, const void *src, unsigned n);
+
+static void putstr(const char *);
+
+extern int _end;
+static long free_mem_ptr = (long)&_end;
+static long free_mem_end_ptr;
+
+#define INPLACE_MOVE_ROUTINE 0x1000
+#define LOW_BUFFER_START 0x2000
+#define LOW_BUFFER_MAX 0x90000
+#define HEAP_SIZE 0x3000
+static unsigned int low_buffer_end, low_buffer_size;
+static int high_loaded =0;
+static uch *high_buffer_start /* = (uch *)(((ulg)&_end) + HEAP_SIZE)*/;
+
+static char *vidmem = (char *)0xb8000;
+static int vidport;
+static int lines, cols;
+
+#ifdef CONFIG_X86_NUMAQ
+void *xquad_portio;
+#endif
+
+
+static void scroll(void)
+{
+ int i;
@ -819,7 +900,7 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+ y--;
+ }
+ } else {
+ vidmem [ ( x + cols * y ) * 2 ] = c;
+ vidmem [ ( x + cols * y ) * 2 ] = c;
+ if ( ++x >= cols ) {
+ x = 0;
+ if ( ++y >= lines ) {
@ -840,14 +921,13 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+ outb_p(0xff & (pos >> 1), vidport+1);
+}
+
+static void* memcpy(void* __dest, __const void* __src,
+ size_t __n)
+static void* memcpy(void* dest, const void* src, unsigned n)
+{
+ int i;
+ char *d = (char *)__dest, *s = (char *)__src;
+ char *d = (char *)dest, *s = (char *)src;
+
+ for (i=0;i<__n;i++) d[i] = s[i];
+ return __dest;
+ for (i=0;i<n;i++) d[i] = s[i];
+ return dest;
+}
+
+/* ===========================================================================
@ -856,85 +936,10 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+ */
+static int fill_inbuf(void)
+{
+ if (insize != 0) {
+ error("ran out of input data");
+ }
+
+ inbuf = input_data;
+ insize = input_len;
+ inptr = 1;
+ return inbuf[0];
+ error("ran out of input data");
+ return 0;
+}
+
+static void error(char *x)
+{
+ putstr("\n\n");
+ putstr(x);
+ putstr("\n\n -- System halted");
+
+ while(1); /* Halt */
+}
+
+#define STACK_SIZE (4096)
+
+long user_stack [STACK_SIZE];
+
+struct {
+ long * a;
+ short b;
+ } stack_start = { & user_stack [STACK_SIZE] , __BOOT_DS };
+
+static void setup_normal_output_buffer(void)
+{
+#ifdef STANDARD_MEMORY_BIOS_CALL
+ if (RM_EXT_MEM_K < 1024) error("Less than 2MB of memory");
+#else
+ if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) < 1024) error("Less than 2MB of memory");
+#endif
+ output_data = (char *)0x100000; /* Points to 1M */
+ free_mem_end_ptr = (long)real_mode;
+}
+
+struct moveparams {
+ uch *low_buffer_start; int lcount;
+ uch *high_buffer_start; int hcount;
+};
+
+static void setup_output_buffer_if_we_run_high(struct moveparams *mv)
+{
+ high_buffer_start = (uch *)(((ulg)&_end) + HEAP_SIZE);
+#ifdef STANDARD_MEMORY_BIOS_CALL
+ if (RM_EXT_MEM_K < (3*1024)) error("Less than 4MB of memory");
+#else
+ if ((RM_ALT_MEM_K > RM_EXT_MEM_K ? RM_ALT_MEM_K : RM_EXT_MEM_K) <
+ (3*1024))
+ error("Less than 4MB of memory");
+#endif
+ mv->low_buffer_start = output_data = (char *)LOW_BUFFER_START;
+ low_buffer_end = ((unsigned int)real_mode > LOW_BUFFER_MAX
+ ? LOW_BUFFER_MAX : (unsigned int)real_mode) & ~0xfff;
+ low_buffer_size = low_buffer_end - LOW_BUFFER_START;
+ high_loaded = 1;
+ free_mem_end_ptr = (long)high_buffer_start;
+ if ( (0x100000 + low_buffer_size) > ((ulg)high_buffer_start)) {
+ high_buffer_start = (uch *)(0x100000 + low_buffer_size);
+ mv->hcount = 0; /* say: we need not to move high_buffer */
+ }
+ else mv->hcount = -1;
+ mv->high_buffer_start = high_buffer_start;
+}
+
+static void close_output_buffer_if_we_run_high(struct moveparams *mv)
+{
+ if (bytes_out > low_buffer_size) {
+ mv->lcount = low_buffer_size;
+ if (mv->hcount)
+ mv->hcount = bytes_out - low_buffer_size;
+ } else {
+ mv->lcount = bytes_out;
+ mv->hcount = 0;
+ }
+}
+
+// When using LZMA in callback, the compressed length is not needed.
+// Otherwise you need a special version of lzma compression program
@ -956,16 +961,16 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+{
+
+ unsigned int i; /* temp value */
+ unsigned int lc; /* literal context bits */
+ unsigned int lp; /* literal pos state bits */
+ unsigned int pb; /* pos state bits */
+ unsigned int lc; /* literal context bits */
+ unsigned int lp; /* literal pos state bits */
+ unsigned int pb; /* pos state bits */
+ unsigned char* workspace;
+ unsigned int uncompressedSize = 0;
+ unsigned char* p;
+
+
+#ifdef _LZMA_IN_CB
+ ILzmaInCallback callback;
+ callback.Read = read_byte;
+ ILzmaInCallback callback;
+ callback.Read = read_byte;
+#else
+ unsigned char* inputbuf;
+ unsigned int lzma_workspace_size;
@ -975,95 +980,35 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+ /* lzma args */
+ i = get_byte();
+ lc = i % 9, i = i / 9;
+ lp = i % 5, pb = i / 5;
+
+ /* skip dictionary size */
+ for (i = 0; i < 4; i++)
+ get_byte();
+ // get uncompressedSize
+ p= (char*)&uncompressedSize;
+ for (i = 0; i < 4; i++)
+ *p++ = get_byte();
+
+ //get compressedSize
+ lp = i % 5, pb = i / 5;
+
+ /* skip dictionary size */
+ for (i = 0; i < 4; i++)
+ get_byte();
+ // get uncompressedSize
+ p= (char*)&uncompressedSize;
+ for (i = 0; i < 4; i++)
+ *p++ = get_byte();
+
+ //get compressedSize
+#ifdef _LZMA_IN_CB
+ for (i = 0; i < 4; i++)
+ get_byte();
+ for (i = 0; i < 4; i++)
+ get_byte();
+#else
+ p= (char*)&compressedSize;
+ for (i = 0; i < 4; i++)
+ *p++ = get_byte();
+ p= (char*)&compressedSize;
+ for (i = 0; i < 4; i++)
+ *p++ = get_byte();
+#endif
+
+#if 0
+ if ( (lc == 5 ) && (lp == 0 ) && ( pb == 0 ))
+ {
+ putstr("got prop!\n");
+ }
+
+#ifndef _LZMA_IN_CB
+ if( compressedSize == 496722 )
+ {
+ putstr( "got the right sizes\n");
+ }
+ else if ( compressedSize > 496722 )
+ {
+ putstr( "greater !\n");
+ }
+ else if ( compressedSize < 496722 )
+ putstr( "smaller!\n");
+
+#endif
+ if ( uncompressedSize == 1187168 )
+ {
+ putstr( "got the right uncompressed size \n");
+ }else if ( uncompressedSize > 1187168 )
+ {
+ putstr( "uncompressedSize greater!\n");
+ }else
+ putstr( "uncompressedSize smaller!|n");
+#endif
+
+ // point it beyond uncompresedSize
+ workspace = high_buffer_start + uncompressedSize;
+ //
+#ifndef _LZMA_IN_CB
+ lzma_workspace_size = (LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp))) * sizeof(CProb);
+ inputbuf = high_buffer_start + uncompressedSize + lzma_workspace_size;
+ // read the compressed data
+ for( i=0; i < compressedSize; i++)
+ {
+ if ( i % ( 1024 * 10 ) == 0 )
+ putstr(".");
+ *inputbuf++ = get_byte();
+ }
+#endif
+
+
+ // point it beyond uncompresedSize
+ workspace = window + uncompressedSize;
+
+ /* decompress kernel */
+#ifdef _LZMA_IN_CB
+ if (LzmaDecode(workspace, ~0, lc, lp, pb,
+ &callback,
+#else
+ if (LzmaDecode(workspace, lzma_workspace_size, lc, lp, pb,
+ inputbuf - compressedSize, compressedSize,
+#endif
+ (unsigned char*)high_buffer_start, uncompressedSize, &i) == LZMA_RESULT_OK)
+ {
+ if ( i != uncompressedSize )
+ error( "kernel corrupted!\n");
+ //copy it back to low_buffer
+ if( uncompressedSize > low_buffer_size )
+ {
+ memcpy((char*)LOW_BUFFER_START, high_buffer_start, low_buffer_size);
+ memcpy(high_buffer_start, high_buffer_start+low_buffer_size,
+ uncompressedSize-low_buffer_size);
+ }
+ else
+ memcpy((char*)LOW_BUFFER_START, high_buffer_start, uncompressedSize );
+ bytes_out = i;
+ if (LzmaDecode(workspace, ~0, lc, lp, pb, &callback,
+ (unsigned char*)window, uncompressedSize, &i) == LZMA_RESULT_OK)
+ return 0;
+ }
+ return 1;
+ else
+ return 1;
+}
+
+
@ -1075,13 +1020,23 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+ *bufferSize = 1;
+ val = get_byte();
+ *buffer = &val;
+ if ( i++ % ( 1024 * 50 ) == 0 )
+ putstr(".");
+ if ( i++ % ( 1024 * 50 ) == 0 )
+ putstr(".");
+ return LZMA_RESULT_OK;
+}
+#endif
+
+asmlinkage int decompress_kernel(struct moveparams *mv, void *rmode)
+static void error(char *x)
+{
+ putstr("\n\n");
+ putstr(x);
+ putstr("\n\n -- System halted");
+
+ while(1); /* Halt */
+}
+
+asmlinkage void decompress_kernel(void *rmode, unsigned long end,
+ uch *input_data, unsigned long input_len, uch *output)
+{
+ real_mode = rmode;
+
@ -1096,22 +1051,29 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/lzma_misc.c linux-2.6.21.1-ow
+ lines = RM_SCREEN_INFO.orig_video_lines;
+ cols = RM_SCREEN_INFO.orig_video_cols;
+
+ if (free_mem_ptr < 0x100000) setup_normal_output_buffer();
+ else setup_output_buffer_if_we_run_high(mv);
+ window = output;
+ inbuf = input_data; /* Input buffer */
+ insize = input_len;
+ inptr = 0;
+
+ putstr("LZMA vmlinuz: Ming-Ching Tiew <mctiew@yahoo.com> ...");
+ if( lzma_unzip() != 0 )
+ {
+ error("inflate error\n");
+ }
+ if ((u32)output & (CONFIG_PHYSICAL_ALIGN -1))
+ error("Destination address not CONFIG_PHYSICAL_ALIGN aligned");
+ if (end > ((-__PAGE_OFFSET-(512 <<20)-1) & 0x7fffffff))
+ error("Destination address too large");
+#ifndef CONFIG_RELOCATABLE
+ if ((u32)output != LOAD_PHYSICAL_ADDR)
+ error("Wrong destination address");
+#endif
+
+ putstr("Uncompressing Linux... ");
+ lzma_unzip();
+ putstr("Ok, booting the kernel.\n");
+ if (high_loaded) close_output_buffer_if_we_run_high(mv);
+ return high_loaded;
+ return;
+}
diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/Makefile linux-2.6.21.1-owrt/arch/i386/boot/compressed/Makefile
--- linux-2.6.21.1/arch/i386/boot/compressed/Makefile 2007-04-27 23:49:26.000000000 +0200
+++ linux-2.6.21.1-owrt/arch/i386/boot/compressed/Makefile 2007-05-14 12:01:25.000000000 +0200
@@ -4,7 +4,7 @@
@@ -4,15 +4,15 @@
# create a compressed vmlinux image from the original vmlinux
#
@ -1120,8 +1082,9 @@ diff -Nur linux-2.6.21.1/arch/i386/boot/compressed/Makefile linux-2.6.21.1-owrt/
vmlinux.bin.all vmlinux.relocs
EXTRA_AFLAGS := -traditional
@@ -12,7 +12,7 @@
CFLAGS_misc.o += -fPIC
LDFLAGS_vmlinux := -T
-CFLAGS_misc.o += -fPIC
+CFLAGS_lzma_misc.o += -fPIC
hostprogs-y := relocs
-$(obj)/vmlinux: $(src)/vmlinux.lds $(obj)/head.o $(obj)/misc.o $(obj)/piggy.o FORCE