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From: Jan Frey <jan.frey@nokia.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH] support for gzipped (ELF) core dumps
Date: 06 Jan 2005 14:19:38 +0100	[thread overview]
Message-ID: <1105017578.28175.1.camel@borcx178> (raw)

Hi,

I've written a patch for 2.4.28 kernel which enables writing of core
dump files for ELF binaries in .gz format. This is interesting when
using and debugging large binaries. In my case core files exceeded 1GB
and got written via NFS...
Anyhow, below patch is not really "beautiful", especially CRC looks
quite annoying here. Consequently it is to be seen as "proof of concept"
and I'm open for further discussion.

Is anybody else interested in something like this at all?

Regards,
Jan


diff -ur linux-2.4.28/arch/i386/config.in linux-2.4.28-patched/arch/i386/config.in
-- linux-2.4.28/arch/i386/config.in	2004-11-17 12:54:21.000000000 +0100
+++ linux-2.4.28-patched/arch/i386/config.in	2005-01-06 11:20:47.000000000 +0100
@@ -479,6 +479,7 @@
    bool '  Magic SysRq key' CONFIG_MAGIC_SYSRQ
    bool '  Spinlock debugging' CONFIG_DEBUG_SPINLOCK
    bool '  Compile the kernel with frame pointers' CONFIG_FRAME_POINTER
+   bool '  Write gzipped core dump files' CONFIG_GZIP_COREDUMPS
 fi
 
 int 'Kernel messages buffer length shift (0 = default)' CONFIG_LOG_BUF_SHIFT 0
diff -ur linux-2.4.28/Documentation/Configure.help linux-2.4.28-patched/Documentation/Configure.help
-- linux-2.4.28/Documentation/Configure.help	2004-11-17 12:54:20.000000000 +0100
+++ linux-2.4.28-patched/Documentation/Configure.help	2005-01-06 11:21:56.000000000 +0100
@@ -29121,6 +29121,11 @@
   
   If unsure, say N.
 
+CONFIG_GZIP_COREDUMPS
+  Saying yes here makes the kernel writing core dump files in a 
+  gzipped compressed format. You will have to uncompress core files
+  with gzip -d prior to usage (e.g. with gdb).
+
 #
 # A couple of things I keep forgetting:
 #   capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet,
diff -ur linux-2.4.28/fs/binfmt_elf.c linux-2.4.28-patched/fs/binfmt_elf.c
-- linux-2.4.28/fs/binfmt_elf.c	2004-11-17 12:54:21.000000000 +0100
+++ linux-2.4.28-patched/fs/binfmt_elf.c	2005-01-06 11:19:47.000000000 +0100
@@ -9,6 +9,7 @@
  * Copyright 1993, 1994: Eric Youngdale (ericy@cais.com).
  */
 
+#include <linux/config.h>
 #include <linux/module.h>
 
 #include <linux/fs.h>
@@ -59,6 +60,533 @@
  */
 #ifdef USE_ELF_CORE_DUMP
 static int elf_core_dump(long signr, struct pt_regs * regs, struct file * file);
+
+#ifdef CONFIG_GZIP_COREDUMPS
+
+/*
+ * Functions added to support writing core files in gzipped format, 2004
+ * Jan Frey <jan.frey@nokia.com>
+ */
+#include <linux/zlib.h>
+#include <linux/vmalloc.h>
+
+/* This table is needed for efficient CRC32 calculation */
+static const unsigned long crc_table[8][256] = {
+	{
+		0x00000000UL, 0x77073096UL, 0xee0e612cUL, 0x990951baUL, 0x076dc419UL,
+		0x706af48fUL, 0xe963a535UL, 0x9e6495a3UL, 0x0edb8832UL, 0x79dcb8a4UL,
+		0xe0d5e91eUL, 0x97d2d988UL, 0x09b64c2bUL, 0x7eb17cbdUL, 0xe7b82d07UL,
+		0x90bf1d91UL, 0x1db71064UL, 0x6ab020f2UL, 0xf3b97148UL, 0x84be41deUL,
+		0x1adad47dUL, 0x6ddde4ebUL, 0xf4d4b551UL, 0x83d385c7UL, 0x136c9856UL,
+		0x646ba8c0UL, 0xfd62f97aUL, 0x8a65c9ecUL, 0x14015c4fUL, 0x63066cd9UL,
+		0xfa0f3d63UL, 0x8d080df5UL, 0x3b6e20c8UL, 0x4c69105eUL, 0xd56041e4UL,
+		0xa2677172UL, 0x3c03e4d1UL, 0x4b04d447UL, 0xd20d85fdUL, 0xa50ab56bUL,
+		0x35b5a8faUL, 0x42b2986cUL, 0xdbbbc9d6UL, 0xacbcf940UL, 0x32d86ce3UL,
+		0x45df5c75UL, 0xdcd60dcfUL, 0xabd13d59UL, 0x26d930acUL, 0x51de003aUL,
+		0xc8d75180UL, 0xbfd06116UL, 0x21b4f4b5UL, 0x56b3c423UL, 0xcfba9599UL,
+		0xb8bda50fUL, 0x2802b89eUL, 0x5f058808UL, 0xc60cd9b2UL, 0xb10be924UL,
+		0x2f6f7c87UL, 0x58684c11UL, 0xc1611dabUL, 0xb6662d3dUL, 0x76dc4190UL,
+		0x01db7106UL, 0x98d220bcUL, 0xefd5102aUL, 0x71b18589UL, 0x06b6b51fUL,
+		0x9fbfe4a5UL, 0xe8b8d433UL, 0x7807c9a2UL, 0x0f00f934UL, 0x9609a88eUL,
+		0xe10e9818UL, 0x7f6a0dbbUL, 0x086d3d2dUL, 0x91646c97UL, 0xe6635c01UL,
+		0x6b6b51f4UL, 0x1c6c6162UL, 0x856530d8UL, 0xf262004eUL, 0x6c0695edUL,
+		0x1b01a57bUL, 0x8208f4c1UL, 0xf50fc457UL, 0x65b0d9c6UL, 0x12b7e950UL,
+		0x8bbeb8eaUL, 0xfcb9887cUL, 0x62dd1ddfUL, 0x15da2d49UL, 0x8cd37cf3UL,
+		0xfbd44c65UL, 0x4db26158UL, 0x3ab551ceUL, 0xa3bc0074UL, 0xd4bb30e2UL,
+		0x4adfa541UL, 0x3dd895d7UL, 0xa4d1c46dUL, 0xd3d6f4fbUL, 0x4369e96aUL,
+		0x346ed9fcUL, 0xad678846UL, 0xda60b8d0UL, 0x44042d73UL, 0x33031de5UL,
+		0xaa0a4c5fUL, 0xdd0d7cc9UL, 0x5005713cUL, 0x270241aaUL, 0xbe0b1010UL,
+		0xc90c2086UL, 0x5768b525UL, 0x206f85b3UL, 0xb966d409UL, 0xce61e49fUL,
+		0x5edef90eUL, 0x29d9c998UL, 0xb0d09822UL, 0xc7d7a8b4UL, 0x59b33d17UL,
+		0x2eb40d81UL, 0xb7bd5c3bUL, 0xc0ba6cadUL, 0xedb88320UL, 0x9abfb3b6UL,
+		0x03b6e20cUL, 0x74b1d29aUL, 0xead54739UL, 0x9dd277afUL, 0x04db2615UL,
+		0x73dc1683UL, 0xe3630b12UL, 0x94643b84UL, 0x0d6d6a3eUL, 0x7a6a5aa8UL,
+		0xe40ecf0bUL, 0x9309ff9dUL, 0x0a00ae27UL, 0x7d079eb1UL, 0xf00f9344UL,
+		0x8708a3d2UL, 0x1e01f268UL, 0x6906c2feUL, 0xf762575dUL, 0x806567cbUL,
+		0x196c3671UL, 0x6e6b06e7UL, 0xfed41b76UL, 0x89d32be0UL, 0x10da7a5aUL,
+		0x67dd4accUL, 0xf9b9df6fUL, 0x8ebeeff9UL, 0x17b7be43UL, 0x60b08ed5UL,
+		0xd6d6a3e8UL, 0xa1d1937eUL, 0x38d8c2c4UL, 0x4fdff252UL, 0xd1bb67f1UL,
+		0xa6bc5767UL, 0x3fb506ddUL, 0x48b2364bUL, 0xd80d2bdaUL, 0xaf0a1b4cUL,
+		0x36034af6UL, 0x41047a60UL, 0xdf60efc3UL, 0xa867df55UL, 0x316e8eefUL,
+		0x4669be79UL, 0xcb61b38cUL, 0xbc66831aUL, 0x256fd2a0UL, 0x5268e236UL,
+		0xcc0c7795UL, 0xbb0b4703UL, 0x220216b9UL, 0x5505262fUL, 0xc5ba3bbeUL,
+		0xb2bd0b28UL, 0x2bb45a92UL, 0x5cb36a04UL, 0xc2d7ffa7UL, 0xb5d0cf31UL,
+		0x2cd99e8bUL, 0x5bdeae1dUL, 0x9b64c2b0UL, 0xec63f226UL, 0x756aa39cUL,
+		0x026d930aUL, 0x9c0906a9UL, 0xeb0e363fUL, 0x72076785UL, 0x05005713UL,
+		0x95bf4a82UL, 0xe2b87a14UL, 0x7bb12baeUL, 0x0cb61b38UL, 0x92d28e9bUL,
+		0xe5d5be0dUL, 0x7cdcefb7UL, 0x0bdbdf21UL, 0x86d3d2d4UL, 0xf1d4e242UL,
+		0x68ddb3f8UL, 0x1fda836eUL, 0x81be16cdUL, 0xf6b9265bUL, 0x6fb077e1UL,
+		0x18b74777UL, 0x88085ae6UL, 0xff0f6a70UL, 0x66063bcaUL, 0x11010b5cUL,
+		0x8f659effUL, 0xf862ae69UL, 0x616bffd3UL, 0x166ccf45UL, 0xa00ae278UL,
+		0xd70dd2eeUL, 0x4e048354UL, 0x3903b3c2UL, 0xa7672661UL, 0xd06016f7UL,
+		0x4969474dUL, 0x3e6e77dbUL, 0xaed16a4aUL, 0xd9d65adcUL, 0x40df0b66UL,
+		0x37d83bf0UL, 0xa9bcae53UL, 0xdebb9ec5UL, 0x47b2cf7fUL, 0x30b5ffe9UL,
+		0xbdbdf21cUL, 0xcabac28aUL, 0x53b39330UL, 0x24b4a3a6UL, 0xbad03605UL,
+		0xcdd70693UL, 0x54de5729UL, 0x23d967bfUL, 0xb3667a2eUL, 0xc4614ab8UL,
+		0x5d681b02UL, 0x2a6f2b94UL, 0xb40bbe37UL, 0xc30c8ea1UL, 0x5a05df1bUL,
+		0x2d02ef8dUL
+	},
+	{
+		0x00000000UL, 0x191b3141UL, 0x32366282UL, 0x2b2d53c3UL, 0x646cc504UL,
+		0x7d77f445UL, 0x565aa786UL, 0x4f4196c7UL, 0xc8d98a08UL, 0xd1c2bb49UL,
+		0xfaefe88aUL, 0xe3f4d9cbUL, 0xacb54f0cUL, 0xb5ae7e4dUL, 0x9e832d8eUL,
+		0x87981ccfUL, 0x4ac21251UL, 0x53d92310UL, 0x78f470d3UL, 0x61ef4192UL,
+		0x2eaed755UL, 0x37b5e614UL, 0x1c98b5d7UL, 0x05838496UL, 0x821b9859UL,
+		0x9b00a918UL, 0xb02dfadbUL, 0xa936cb9aUL, 0xe6775d5dUL, 0xff6c6c1cUL,
+		0xd4413fdfUL, 0xcd5a0e9eUL, 0x958424a2UL, 0x8c9f15e3UL, 0xa7b24620UL,
+		0xbea97761UL, 0xf1e8e1a6UL, 0xe8f3d0e7UL, 0xc3de8324UL, 0xdac5b265UL,
+		0x5d5daeaaUL, 0x44469febUL, 0x6f6bcc28UL, 0x7670fd69UL, 0x39316baeUL,
+		0x202a5aefUL, 0x0b07092cUL, 0x121c386dUL, 0xdf4636f3UL, 0xc65d07b2UL,
+		0xed705471UL, 0xf46b6530UL, 0xbb2af3f7UL, 0xa231c2b6UL, 0x891c9175UL,
+		0x9007a034UL, 0x179fbcfbUL, 0x0e848dbaUL, 0x25a9de79UL, 0x3cb2ef38UL,
+		0x73f379ffUL, 0x6ae848beUL, 0x41c51b7dUL, 0x58de2a3cUL, 0xf0794f05UL,
+		0xe9627e44UL, 0xc24f2d87UL, 0xdb541cc6UL, 0x94158a01UL, 0x8d0ebb40UL,
+		0xa623e883UL, 0xbf38d9c2UL, 0x38a0c50dUL, 0x21bbf44cUL, 0x0a96a78fUL,
+		0x138d96ceUL, 0x5ccc0009UL, 0x45d73148UL, 0x6efa628bUL, 0x77e153caUL,
+		0xbabb5d54UL, 0xa3a06c15UL, 0x888d3fd6UL, 0x91960e97UL, 0xded79850UL,
+		0xc7cca911UL, 0xece1fad2UL, 0xf5facb93UL, 0x7262d75cUL, 0x6b79e61dUL,
+		0x4054b5deUL, 0x594f849fUL, 0x160e1258UL, 0x0f152319UL, 0x243870daUL,
+		0x3d23419bUL, 0x65fd6ba7UL, 0x7ce65ae6UL, 0x57cb0925UL, 0x4ed03864UL,
+		0x0191aea3UL, 0x188a9fe2UL, 0x33a7cc21UL, 0x2abcfd60UL, 0xad24e1afUL,
+		0xb43fd0eeUL, 0x9f12832dUL, 0x8609b26cUL, 0xc94824abUL, 0xd05315eaUL,
+		0xfb7e4629UL, 0xe2657768UL, 0x2f3f79f6UL, 0x362448b7UL, 0x1d091b74UL,
+		0x04122a35UL, 0x4b53bcf2UL, 0x52488db3UL, 0x7965de70UL, 0x607eef31UL,
+		0xe7e6f3feUL, 0xfefdc2bfUL, 0xd5d0917cUL, 0xcccba03dUL, 0x838a36faUL,
+		0x9a9107bbUL, 0xb1bc5478UL, 0xa8a76539UL, 0x3b83984bUL, 0x2298a90aUL,
+		0x09b5fac9UL, 0x10aecb88UL, 0x5fef5d4fUL, 0x46f46c0eUL, 0x6dd93fcdUL,
+		0x74c20e8cUL, 0xf35a1243UL, 0xea412302UL, 0xc16c70c1UL, 0xd8774180UL,
+		0x9736d747UL, 0x8e2de606UL, 0xa500b5c5UL, 0xbc1b8484UL, 0x71418a1aUL,
+		0x685abb5bUL, 0x4377e898UL, 0x5a6cd9d9UL, 0x152d4f1eUL, 0x0c367e5fUL,
+		0x271b2d9cUL, 0x3e001cddUL, 0xb9980012UL, 0xa0833153UL, 0x8bae6290UL,
+		0x92b553d1UL, 0xddf4c516UL, 0xc4eff457UL, 0xefc2a794UL, 0xf6d996d5UL,
+		0xae07bce9UL, 0xb71c8da8UL, 0x9c31de6bUL, 0x852aef2aUL, 0xca6b79edUL,
+		0xd37048acUL, 0xf85d1b6fUL, 0xe1462a2eUL, 0x66de36e1UL, 0x7fc507a0UL,
+		0x54e85463UL, 0x4df36522UL, 0x02b2f3e5UL, 0x1ba9c2a4UL, 0x30849167UL,
+		0x299fa026UL, 0xe4c5aeb8UL, 0xfdde9ff9UL, 0xd6f3cc3aUL, 0xcfe8fd7bUL,
+		0x80a96bbcUL, 0x99b25afdUL, 0xb29f093eUL, 0xab84387fUL, 0x2c1c24b0UL,
+		0x350715f1UL, 0x1e2a4632UL, 0x07317773UL, 0x4870e1b4UL, 0x516bd0f5UL,
+		0x7a468336UL, 0x635db277UL, 0xcbfad74eUL, 0xd2e1e60fUL, 0xf9ccb5ccUL,
+		0xe0d7848dUL, 0xaf96124aUL, 0xb68d230bUL, 0x9da070c8UL, 0x84bb4189UL,
+		0x03235d46UL, 0x1a386c07UL, 0x31153fc4UL, 0x280e0e85UL, 0x674f9842UL,
+		0x7e54a903UL, 0x5579fac0UL, 0x4c62cb81UL, 0x8138c51fUL, 0x9823f45eUL,
+		0xb30ea79dUL, 0xaa1596dcUL, 0xe554001bUL, 0xfc4f315aUL, 0xd7626299UL,
+		0xce7953d8UL, 0x49e14f17UL, 0x50fa7e56UL, 0x7bd72d95UL, 0x62cc1cd4UL,
+		0x2d8d8a13UL, 0x3496bb52UL, 0x1fbbe891UL, 0x06a0d9d0UL, 0x5e7ef3ecUL,
+		0x4765c2adUL, 0x6c48916eUL, 0x7553a02fUL, 0x3a1236e8UL, 0x230907a9UL,
+		0x0824546aUL, 0x113f652bUL, 0x96a779e4UL, 0x8fbc48a5UL, 0xa4911b66UL,
+		0xbd8a2a27UL, 0xf2cbbce0UL, 0xebd08da1UL, 0xc0fdde62UL, 0xd9e6ef23UL,
+		0x14bce1bdUL, 0x0da7d0fcUL, 0x268a833fUL, 0x3f91b27eUL, 0x70d024b9UL,
+		0x69cb15f8UL, 0x42e6463bUL, 0x5bfd777aUL, 0xdc656bb5UL, 0xc57e5af4UL,
+		0xee530937UL, 0xf7483876UL, 0xb809aeb1UL, 0xa1129ff0UL, 0x8a3fcc33UL,
+		0x9324fd72UL
+	},
+	{
+		0x00000000UL, 0x01c26a37UL, 0x0384d46eUL, 0x0246be59UL, 0x0709a8dcUL,
+		0x06cbc2ebUL, 0x048d7cb2UL, 0x054f1685UL, 0x0e1351b8UL, 0x0fd13b8fUL,
+		0x0d9785d6UL, 0x0c55efe1UL, 0x091af964UL, 0x08d89353UL, 0x0a9e2d0aUL,
+		0x0b5c473dUL, 0x1c26a370UL, 0x1de4c947UL, 0x1fa2771eUL, 0x1e601d29UL,
+		0x1b2f0bacUL, 0x1aed619bUL, 0x18abdfc2UL, 0x1969b5f5UL, 0x1235f2c8UL,
+		0x13f798ffUL, 0x11b126a6UL, 0x10734c91UL, 0x153c5a14UL, 0x14fe3023UL,
+		0x16b88e7aUL, 0x177ae44dUL, 0x384d46e0UL, 0x398f2cd7UL, 0x3bc9928eUL,
+		0x3a0bf8b9UL, 0x3f44ee3cUL, 0x3e86840bUL, 0x3cc03a52UL, 0x3d025065UL,
+		0x365e1758UL, 0x379c7d6fUL, 0x35dac336UL, 0x3418a901UL, 0x3157bf84UL,
+		0x3095d5b3UL, 0x32d36beaUL, 0x331101ddUL, 0x246be590UL, 0x25a98fa7UL,
+		0x27ef31feUL, 0x262d5bc9UL, 0x23624d4cUL, 0x22a0277bUL, 0x20e69922UL,
+		0x2124f315UL, 0x2a78b428UL, 0x2bbade1fUL, 0x29fc6046UL, 0x283e0a71UL,
+		0x2d711cf4UL, 0x2cb376c3UL, 0x2ef5c89aUL, 0x2f37a2adUL, 0x709a8dc0UL,
+		0x7158e7f7UL, 0x731e59aeUL, 0x72dc3399UL, 0x7793251cUL, 0x76514f2bUL,
+		0x7417f172UL, 0x75d59b45UL, 0x7e89dc78UL, 0x7f4bb64fUL, 0x7d0d0816UL,
+		0x7ccf6221UL, 0x798074a4UL, 0x78421e93UL, 0x7a04a0caUL, 0x7bc6cafdUL,
+		0x6cbc2eb0UL, 0x6d7e4487UL, 0x6f38fadeUL, 0x6efa90e9UL, 0x6bb5866cUL,
+		0x6a77ec5bUL, 0x68315202UL, 0x69f33835UL, 0x62af7f08UL, 0x636d153fUL,
+		0x612bab66UL, 0x60e9c151UL, 0x65a6d7d4UL, 0x6464bde3UL, 0x662203baUL,
+		0x67e0698dUL, 0x48d7cb20UL, 0x4915a117UL, 0x4b531f4eUL, 0x4a917579UL,
+		0x4fde63fcUL, 0x4e1c09cbUL, 0x4c5ab792UL, 0x4d98dda5UL, 0x46c49a98UL,
+		0x4706f0afUL, 0x45404ef6UL, 0x448224c1UL, 0x41cd3244UL, 0x400f5873UL,
+		0x4249e62aUL, 0x438b8c1dUL, 0x54f16850UL, 0x55330267UL, 0x5775bc3eUL,
+		0x56b7d609UL, 0x53f8c08cUL, 0x523aaabbUL, 0x507c14e2UL, 0x51be7ed5UL,
+		0x5ae239e8UL, 0x5b2053dfUL, 0x5966ed86UL, 0x58a487b1UL, 0x5deb9134UL,
+		0x5c29fb03UL, 0x5e6f455aUL, 0x5fad2f6dUL, 0xe1351b80UL, 0xe0f771b7UL,
+		0xe2b1cfeeUL, 0xe373a5d9UL, 0xe63cb35cUL, 0xe7fed96bUL, 0xe5b86732UL,
+		0xe47a0d05UL, 0xef264a38UL, 0xeee4200fUL, 0xeca29e56UL, 0xed60f461UL,
+		0xe82fe2e4UL, 0xe9ed88d3UL, 0xebab368aUL, 0xea695cbdUL, 0xfd13b8f0UL,
+		0xfcd1d2c7UL, 0xfe976c9eUL, 0xff5506a9UL, 0xfa1a102cUL, 0xfbd87a1bUL,
+		0xf99ec442UL, 0xf85cae75UL, 0xf300e948UL, 0xf2c2837fUL, 0xf0843d26UL,
+		0xf1465711UL, 0xf4094194UL, 0xf5cb2ba3UL, 0xf78d95faUL, 0xf64fffcdUL,
+		0xd9785d60UL, 0xd8ba3757UL, 0xdafc890eUL, 0xdb3ee339UL, 0xde71f5bcUL,
+		0xdfb39f8bUL, 0xddf521d2UL, 0xdc374be5UL, 0xd76b0cd8UL, 0xd6a966efUL,
+		0xd4efd8b6UL, 0xd52db281UL, 0xd062a404UL, 0xd1a0ce33UL, 0xd3e6706aUL,
+		0xd2241a5dUL, 0xc55efe10UL, 0xc49c9427UL, 0xc6da2a7eUL, 0xc7184049UL,
+		0xc25756ccUL, 0xc3953cfbUL, 0xc1d382a2UL, 0xc011e895UL, 0xcb4dafa8UL,
+		0xca8fc59fUL, 0xc8c97bc6UL, 0xc90b11f1UL, 0xcc440774UL, 0xcd866d43UL,
+		0xcfc0d31aUL, 0xce02b92dUL, 0x91af9640UL, 0x906dfc77UL, 0x922b422eUL,
+		0x93e92819UL, 0x96a63e9cUL, 0x976454abUL, 0x9522eaf2UL, 0x94e080c5UL,
+		0x9fbcc7f8UL, 0x9e7eadcfUL, 0x9c381396UL, 0x9dfa79a1UL, 0x98b56f24UL,
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+		0xbe9834edUL
+	},
+	{
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+	},
+	{
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+		0x8def022dUL
+	},
+	{
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+		0x370953eeUL, 0x763848f7UL, 0xb1ae09b8UL, 0xf09f12a1UL, 0x33cc3f8aUL,
+		0x72fd2493UL
+	},
+	{
+		0x00000000UL, 0x376ac201UL, 0x6ed48403UL, 0x59be4602UL, 0xdca80907UL,
+		0xebc2cb06UL, 0xb27c8d04UL, 0x85164f05UL, 0xb851130eUL, 0x8f3bd10fUL,
+		0xd685970dUL, 0xe1ef550cUL, 0x64f91a09UL, 0x5393d808UL, 0x0a2d9e0aUL,
+		0x3d475c0bUL, 0x70a3261cUL, 0x47c9e41dUL, 0x1e77a21fUL, 0x291d601eUL,
+		0xac0b2f1bUL, 0x9b61ed1aUL, 0xc2dfab18UL, 0xf5b56919UL, 0xc8f23512UL,
+		0xff98f713UL, 0xa626b111UL, 0x914c7310UL, 0x145a3c15UL, 0x2330fe14UL,
+		0x7a8eb816UL, 0x4de47a17UL, 0xe0464d38UL, 0xd72c8f39UL, 0x8e92c93bUL,
+		0xb9f80b3aUL, 0x3cee443fUL, 0x0b84863eUL, 0x523ac03cUL, 0x6550023dUL,
+		0x58175e36UL, 0x6f7d9c37UL, 0x36c3da35UL, 0x01a91834UL, 0x84bf5731UL,
+		0xb3d59530UL, 0xea6bd332UL, 0xdd011133UL, 0x90e56b24UL, 0xa78fa925UL,
+		0xfe31ef27UL, 0xc95b2d26UL, 0x4c4d6223UL, 0x7b27a022UL, 0x2299e620UL,
+		0x15f32421UL, 0x28b4782aUL, 0x1fdeba2bUL, 0x4660fc29UL, 0x710a3e28UL,
+		0xf41c712dUL, 0xc376b32cUL, 0x9ac8f52eUL, 0xada2372fUL, 0xc08d9a70UL,
+		0xf7e75871UL, 0xae591e73UL, 0x9933dc72UL, 0x1c259377UL, 0x2b4f5176UL,
+		0x72f11774UL, 0x459bd575UL, 0x78dc897eUL, 0x4fb64b7fUL, 0x16080d7dUL,
+		0x2162cf7cUL, 0xa4748079UL, 0x931e4278UL, 0xcaa0047aUL, 0xfdcac67bUL,
+		0xb02ebc6cUL, 0x87447e6dUL, 0xdefa386fUL, 0xe990fa6eUL, 0x6c86b56bUL,
+		0x5bec776aUL, 0x02523168UL, 0x3538f369UL, 0x087faf62UL, 0x3f156d63UL,
+		0x66ab2b61UL, 0x51c1e960UL, 0xd4d7a665UL, 0xe3bd6464UL, 0xba032266UL,
+		0x8d69e067UL, 0x20cbd748UL, 0x17a11549UL, 0x4e1f534bUL, 0x7975914aUL,
+		0xfc63de4fUL, 0xcb091c4eUL, 0x92b75a4cUL, 0xa5dd984dUL, 0x989ac446UL,
+		0xaff00647UL, 0xf64e4045UL, 0xc1248244UL, 0x4432cd41UL, 0x73580f40UL,
+		0x2ae64942UL, 0x1d8c8b43UL, 0x5068f154UL, 0x67023355UL, 0x3ebc7557UL,
+		0x09d6b756UL, 0x8cc0f853UL, 0xbbaa3a52UL, 0xe2147c50UL, 0xd57ebe51UL,
+		0xe839e25aUL, 0xdf53205bUL, 0x86ed6659UL, 0xb187a458UL, 0x3491eb5dUL,
+		0x03fb295cUL, 0x5a456f5eUL, 0x6d2fad5fUL, 0x801b35e1UL, 0xb771f7e0UL,
+		0xeecfb1e2UL, 0xd9a573e3UL, 0x5cb33ce6UL, 0x6bd9fee7UL, 0x3267b8e5UL,
+		0x050d7ae4UL, 0x384a26efUL, 0x0f20e4eeUL, 0x569ea2ecUL, 0x61f460edUL,
+		0xe4e22fe8UL, 0xd388ede9UL, 0x8a36abebUL, 0xbd5c69eaUL, 0xf0b813fdUL,
+		0xc7d2d1fcUL, 0x9e6c97feUL, 0xa90655ffUL, 0x2c101afaUL, 0x1b7ad8fbUL,
+		0x42c49ef9UL, 0x75ae5cf8UL, 0x48e900f3UL, 0x7f83c2f2UL, 0x263d84f0UL,
+		0x115746f1UL, 0x944109f4UL, 0xa32bcbf5UL, 0xfa958df7UL, 0xcdff4ff6UL,
+		0x605d78d9UL, 0x5737bad8UL, 0x0e89fcdaUL, 0x39e33edbUL, 0xbcf571deUL,
+		0x8b9fb3dfUL, 0xd221f5ddUL, 0xe54b37dcUL, 0xd80c6bd7UL, 0xef66a9d6UL,
+		0xb6d8efd4UL, 0x81b22dd5UL, 0x04a462d0UL, 0x33cea0d1UL, 0x6a70e6d3UL,
+		0x5d1a24d2UL, 0x10fe5ec5UL, 0x27949cc4UL, 0x7e2adac6UL, 0x494018c7UL,
+		0xcc5657c2UL, 0xfb3c95c3UL, 0xa282d3c1UL, 0x95e811c0UL, 0xa8af4dcbUL,
+		0x9fc58fcaUL, 0xc67bc9c8UL, 0xf1110bc9UL, 0x740744ccUL, 0x436d86cdUL,
+		0x1ad3c0cfUL, 0x2db902ceUL, 0x4096af91UL, 0x77fc6d90UL, 0x2e422b92UL,
+		0x1928e993UL, 0x9c3ea696UL, 0xab546497UL, 0xf2ea2295UL, 0xc580e094UL,
+		0xf8c7bc9fUL, 0xcfad7e9eUL, 0x9613389cUL, 0xa179fa9dUL, 0x246fb598UL,
+		0x13057799UL, 0x4abb319bUL, 0x7dd1f39aUL, 0x3035898dUL, 0x075f4b8cUL,
+		0x5ee10d8eUL, 0x698bcf8fUL, 0xec9d808aUL, 0xdbf7428bUL, 0x82490489UL,
+		0xb523c688UL, 0x88649a83UL, 0xbf0e5882UL, 0xe6b01e80UL, 0xd1dadc81UL,
+		0x54cc9384UL, 0x63a65185UL, 0x3a181787UL, 0x0d72d586UL, 0xa0d0e2a9UL,
+		0x97ba20a8UL, 0xce0466aaUL, 0xf96ea4abUL, 0x7c78ebaeUL, 0x4b1229afUL,
+		0x12ac6fadUL, 0x25c6adacUL, 0x1881f1a7UL, 0x2feb33a6UL, 0x765575a4UL,
+		0x413fb7a5UL, 0xc429f8a0UL, 0xf3433aa1UL, 0xaafd7ca3UL, 0x9d97bea2UL,
+		0xd073c4b5UL, 0xe71906b4UL, 0xbea740b6UL, 0x89cd82b7UL, 0x0cdbcdb2UL,
+		0x3bb10fb3UL, 0x620f49b1UL, 0x55658bb0UL, 0x6822d7bbUL, 0x5f4815baUL,
+		0x06f653b8UL, 0x319c91b9UL, 0xb48adebcUL, 0x83e01cbdUL, 0xda5e5abfUL,
+		0xed3498beUL
+	},
+	{
+		0x00000000UL, 0x6567bcb8UL, 0x8bc809aaUL, 0xeeafb512UL, 0x5797628fUL,
+		0x32f0de37UL, 0xdc5f6b25UL, 0xb938d79dUL, 0xef28b4c5UL, 0x8a4f087dUL,
+		0x64e0bd6fUL, 0x018701d7UL, 0xb8bfd64aUL, 0xddd86af2UL, 0x3377dfe0UL,
+		0x56106358UL, 0x9f571950UL, 0xfa30a5e8UL, 0x149f10faUL, 0x71f8ac42UL,
+		0xc8c07bdfUL, 0xada7c767UL, 0x43087275UL, 0x266fcecdUL, 0x707fad95UL,
+		0x1518112dUL, 0xfbb7a43fUL, 0x9ed01887UL, 0x27e8cf1aUL, 0x428f73a2UL,
+		0xac20c6b0UL, 0xc9477a08UL, 0x3eaf32a0UL, 0x5bc88e18UL, 0xb5673b0aUL,
+		0xd00087b2UL, 0x6938502fUL, 0x0c5fec97UL, 0xe2f05985UL, 0x8797e53dUL,
+		0xd1878665UL, 0xb4e03addUL, 0x5a4f8fcfUL, 0x3f283377UL, 0x8610e4eaUL,
+		0xe3775852UL, 0x0dd8ed40UL, 0x68bf51f8UL, 0xa1f82bf0UL, 0xc49f9748UL,
+		0x2a30225aUL, 0x4f579ee2UL, 0xf66f497fUL, 0x9308f5c7UL, 0x7da740d5UL,
+		0x18c0fc6dUL, 0x4ed09f35UL, 0x2bb7238dUL, 0xc518969fUL, 0xa07f2a27UL,
+		0x1947fdbaUL, 0x7c204102UL, 0x928ff410UL, 0xf7e848a8UL, 0x3d58149bUL,
+		0x583fa823UL, 0xb6901d31UL, 0xd3f7a189UL, 0x6acf7614UL, 0x0fa8caacUL,
+		0xe1077fbeUL, 0x8460c306UL, 0xd270a05eUL, 0xb7171ce6UL, 0x59b8a9f4UL,
+		0x3cdf154cUL, 0x85e7c2d1UL, 0xe0807e69UL, 0x0e2fcb7bUL, 0x6b4877c3UL,
+		0xa20f0dcbUL, 0xc768b173UL, 0x29c70461UL, 0x4ca0b8d9UL, 0xf5986f44UL,
+		0x90ffd3fcUL, 0x7e5066eeUL, 0x1b37da56UL, 0x4d27b90eUL, 0x284005b6UL,
+		0xc6efb0a4UL, 0xa3880c1cUL, 0x1ab0db81UL, 0x7fd76739UL, 0x9178d22bUL,
+		0xf41f6e93UL, 0x03f7263bUL, 0x66909a83UL, 0x883f2f91UL, 0xed589329UL,
+		0x546044b4UL, 0x3107f80cUL, 0xdfa84d1eUL, 0xbacff1a6UL, 0xecdf92feUL,
+		0x89b82e46UL, 0x67179b54UL, 0x027027ecUL, 0xbb48f071UL, 0xde2f4cc9UL,
+		0x3080f9dbUL, 0x55e74563UL, 0x9ca03f6bUL, 0xf9c783d3UL, 0x176836c1UL,
+		0x720f8a79UL, 0xcb375de4UL, 0xae50e15cUL, 0x40ff544eUL, 0x2598e8f6UL,
+		0x73888baeUL, 0x16ef3716UL, 0xf8408204UL, 0x9d273ebcUL, 0x241fe921UL,
+		0x41785599UL, 0xafd7e08bUL, 0xcab05c33UL, 0x3bb659edUL, 0x5ed1e555UL,
+		0xb07e5047UL, 0xd519ecffUL, 0x6c213b62UL, 0x094687daUL, 0xe7e932c8UL,
+		0x828e8e70UL, 0xd49eed28UL, 0xb1f95190UL, 0x5f56e482UL, 0x3a31583aUL,
+		0x83098fa7UL, 0xe66e331fUL, 0x08c1860dUL, 0x6da63ab5UL, 0xa4e140bdUL,
+		0xc186fc05UL, 0x2f294917UL, 0x4a4ef5afUL, 0xf3762232UL, 0x96119e8aUL,
+		0x78be2b98UL, 0x1dd99720UL, 0x4bc9f478UL, 0x2eae48c0UL, 0xc001fdd2UL,
+		0xa566416aUL, 0x1c5e96f7UL, 0x79392a4fUL, 0x97969f5dUL, 0xf2f123e5UL,
+		0x05196b4dUL, 0x607ed7f5UL, 0x8ed162e7UL, 0xebb6de5fUL, 0x528e09c2UL,
+		0x37e9b57aUL, 0xd9460068UL, 0xbc21bcd0UL, 0xea31df88UL, 0x8f566330UL,
+		0x61f9d622UL, 0x049e6a9aUL, 0xbda6bd07UL, 0xd8c101bfUL, 0x366eb4adUL,
+		0x53090815UL, 0x9a4e721dUL, 0xff29cea5UL, 0x11867bb7UL, 0x74e1c70fUL,
+		0xcdd91092UL, 0xa8beac2aUL, 0x46111938UL, 0x2376a580UL, 0x7566c6d8UL,
+		0x10017a60UL, 0xfeaecf72UL, 0x9bc973caUL, 0x22f1a457UL, 0x479618efUL,
+		0xa939adfdUL, 0xcc5e1145UL, 0x06ee4d76UL, 0x6389f1ceUL, 0x8d2644dcUL,
+		0xe841f864UL, 0x51792ff9UL, 0x341e9341UL, 0xdab12653UL, 0xbfd69aebUL,
+		0xe9c6f9b3UL, 0x8ca1450bUL, 0x620ef019UL, 0x07694ca1UL, 0xbe519b3cUL,
+		0xdb362784UL, 0x35999296UL, 0x50fe2e2eUL, 0x99b95426UL, 0xfcdee89eUL,
+		0x12715d8cUL, 0x7716e134UL, 0xce2e36a9UL, 0xab498a11UL, 0x45e63f03UL,
+		0x208183bbUL, 0x7691e0e3UL, 0x13f65c5bUL, 0xfd59e949UL, 0x983e55f1UL,
+		0x2106826cUL, 0x44613ed4UL, 0xaace8bc6UL, 0xcfa9377eUL, 0x38417fd6UL,
+		0x5d26c36eUL, 0xb389767cUL, 0xd6eecac4UL, 0x6fd61d59UL, 0x0ab1a1e1UL,
+		0xe41e14f3UL, 0x8179a84bUL, 0xd769cb13UL, 0xb20e77abUL, 0x5ca1c2b9UL,
+		0x39c67e01UL, 0x80fea99cUL, 0xe5991524UL, 0x0b36a036UL, 0x6e511c8eUL,
+		0xa7166686UL, 0xc271da3eUL, 0x2cde6f2cUL, 0x49b9d394UL, 0xf0810409UL,
+		0x95e6b8b1UL, 0x7b490da3UL, 0x1e2eb11bUL, 0x483ed243UL, 0x2d596efbUL,
+		0xc3f6dbe9UL, 0xa6916751UL, 0x1fa9b0ccUL, 0x7ace0c74UL, 0x9461b966UL,
+		0xf10605deUL
+	}
+};
+
+static __u32 crc32 (__u32 crc, const unsigned char *buf, unsigned len)
+{
+	__u32        c;
+	const __u32 *buf4;
+
+	if (buf == 0) 
+		return 0UL; /* init */
+
+	c = ~crc;
+	while (len && ((int)buf & 3)) {
+		c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+		len--;
+	}
+
+	buf4 = (const __u32 *)buf;
+
+	while (len >= 32) {
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24]; 
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24];
+
+		len -= 32;
+	}
+
+	while (len >= 4) {
+		c ^= *buf4++; 
+		c = crc_table[3][c & 0xff] ^ 
+			crc_table[2][(c >> 8) & 0xff] ^ 
+			crc_table[1][(c >> 16) & 0xff] ^ 
+			crc_table[0][c >> 24];
+		len -= 4;
+	}
+
+	buf = (const unsigned char *)buf4;
+  
+	if (len) do {
+		c = crc_table[0][(c ^ *buf++) & 0xff] ^ (c >> 8);
+	} while (--len);
+	
+	c = ~c;
+	return c;
+}
+#endif
+
 #else
 #define elf_core_dump	NULL
 #endif
@@ -941,15 +1469,83 @@
  * Modelled on fs/exec.c:aout_core_dump()
  * Jeremy Fitzhardinge <jeremy@sw.oz.au>
  */
+#ifdef CONFIG_GZIP_COREDUMPS
 /*
- * These are the only things you should do on a core-file: use only these
- * functions to write out all the necessary info.
+ * gz writing support 
+ * Jan Frey <jan.frey@nokia.com>
  */
-static int dump_write(struct file *file, const void *addr, int nr)
+static int gz_dump_write(struct file *file, const void *addr, int nr, __u32 *crc, z_streamp zstr)
 {
-	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+	const int OUT_BUF_SIZE = 100*1024;
+	int       all_fine     = 1;
+	void     *out_buf      = vmalloc(OUT_BUF_SIZE);
+
+	if (!out_buf) {
+		printk(KERN_WARNING "Failed to allocate deflate buffer");
+		return 0;
+	}
+
+	*crc = crc32 (*crc, addr, nr);
+
+	zstr->next_in  = addr;
+	zstr->avail_in = nr;
+
+	do {
+		zstr->next_out  = out_buf;
+		zstr->avail_out = OUT_BUF_SIZE;
+
+		if (zlib_deflate (zstr, Z_NO_FLUSH) == Z_OK) { 
+			/* new output generated */
+			all_fine = (file->f_op->write (file, 
+						       out_buf, 
+						       OUT_BUF_SIZE - zstr->avail_out, 
+						       &file->f_pos) 
+				    == (OUT_BUF_SIZE - zstr->avail_out));
+		}
+	} while ((zstr->avail_out != OUT_BUF_SIZE) && all_fine);
+
+	vfree (out_buf);
+	return all_fine;
 }
 
+static int gz_finish (struct file *file, z_streamp zstr)
+{
+	const int OUT_BUF_SIZE = 100*1024;
+	int       all_fine     = 1;
+	int       ret;
+	void     *out_buf      = vmalloc(OUT_BUF_SIZE);
+
+	if (!out_buf) {
+		printk(KERN_WARNING "Failed to allocate deflate buffer");
+		return 0;
+	}
+
+	zstr->next_in   = 0;
+	zstr->avail_in  = 0;
+
+	do {
+		zstr->next_out  = out_buf;
+		zstr->avail_out = OUT_BUF_SIZE;
+
+		ret = zlib_deflate (zstr, Z_FINISH);
+		if ((ret == Z_OK) || (ret == Z_STREAM_END)) { 
+			/* new output generated */
+			all_fine = (file->f_op->write (file, 
+						      out_buf, 
+						      OUT_BUF_SIZE - zstr->avail_out, 
+						      &file->f_pos) 
+				    == (OUT_BUF_SIZE - zstr->avail_out)); 
+		}
+	} while ((zstr->avail_out != OUT_BUF_SIZE) && all_fine && (ret != Z_STREAM_END));
+
+	vfree (out_buf);
+	return all_fine;
+}
+#else
+/*
+ * These are the only things you should do on a core-file: use only these
+ * functions to write out all the necessary info.
+ */
 static int dump_seek(struct file *file, off_t off)
 {
 	if (file->f_op->llseek) {
@@ -959,6 +1555,13 @@
 		file->f_pos = off;
 	return 1;
 }
+#endif
+
+static int dump_write(struct file *file, const void *addr, int nr)
+{
+	return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
+}
+
 
 /*
  * Decide whether a segment is worth dumping; default is yes to be
@@ -1030,11 +1633,54 @@
 }
 #endif
 
-#define DUMP_WRITE(addr, nr)	\
-	do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
+#ifdef CONFIG_GZIP_COREDUMPS
+#define PAD_GZ(nr, buf, crc, str) \
+        do { \
+	        int cur=(nr); \
+         	while (cur>1024) { \
+                        gz_dump_write(file, (buf), 1024, (crc), (str)); \
+                        cur-=1024; \
+                } \
+                if (cur) { \
+                        gz_dump_write(file, (buf), cur, (crc), (str)); \
+                } \
+        } while(0)
+
+#define DUMP_GZ(addr, nr, crc, str)	\
+	do { if (!gz_dump_write(file, (addr), (nr), (crc), (str))) return 0; } while(0)
+#else
 #define DUMP_SEEK(off)	\
 	do { if (!dump_seek(file, (off))) return 0; } while(0)
+#endif
+
+#define DUMP_WRITE(addr, nr)	\
+	do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
+
+#ifdef CONFIG_GZIP_COREDUMPS
+static int writenote_gz(struct memelfnote *men, struct file *file, char *buf, __u32 *crc, z_streamp zstr)
+{
+	struct elf_note en;
+	int dummy_bytes;
+
+	en.n_namesz = strlen(men->name);
+	en.n_descsz = men->datasz;
+	en.n_type = men->type;
 
+	DUMP_GZ(&en, sizeof(en), crc, zstr);
+	DUMP_GZ(men->name, en.n_namesz, crc, zstr);
+
+	dummy_bytes = roundup((unsigned long)zstr->total_in, 4) - zstr->total_in;
+	PAD_GZ(dummy_bytes, buf, crc, zstr);
+
+	DUMP_GZ(men->data, men->datasz, crc, zstr);
+
+	dummy_bytes = roundup((unsigned long)zstr->total_in, 4) - zstr->total_in;
+	PAD_GZ(dummy_bytes, buf, crc, zstr);
+
+	return 1;
+}
+#undef DUMP_GZ
+#else
 static int writenote(struct memelfnote *men, struct file *file)
 {
 	struct elf_note en;
@@ -1054,13 +1700,21 @@
 }
 #undef DUMP_WRITE
 #undef DUMP_SEEK
+#endif
 
+#ifdef CONFIG_GZIP_COREDUMPS
+#define DUMP_GZ(addr, nr, crc, str)	\
+	if ((size += (nr)) > limit || !gz_dump_write(file, (addr), (nr), (crc), (str))) \
+		goto end_coredump;
+#else
 #define DUMP_WRITE(addr, nr)	\
 	if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
 		goto end_coredump;
 #define DUMP_SEEK(off)	\
 	if (!dump_seek(file, (off))) \
 		goto end_coredump;
+#endif
+
 /*
  * Actual dumper
  *
@@ -1085,6 +1739,41 @@
 	elf_fpregset_t fpu;		/* NT_PRFPREG */
 	struct elf_prpsinfo psinfo;	/* NT_PRPSINFO */
 
+#ifdef CONFIG_GZIP_COREDUMPS
+	z_stream gz_stream;
+	void *deflate_workspace;
+	__u32 crc = 0; /* init */
+	unsigned char gz_magic[10] = { /* gzip magic header */
+	  0x1f, 0x8b, Z_DEFLATED, 0, 0, 0, 0, 0, 0, 0x03 }; 
+	unsigned char *empty_buf;	
+
+	deflate_workspace = vmalloc(zlib_deflate_workspacesize());
+        if (!deflate_workspace) {
+		printk(KERN_WARNING "Failed to allocate deflate workspace\n");
+		return -ENOMEM;
+        }
+
+	gz_stream.workspace = deflate_workspace;
+	if (Z_OK != zlib_deflateInit2(&gz_stream, 
+				      7, /* compression level */
+				      Z_DEFLATED,
+				      -15, /* window bits */
+				      6, /* mem level */
+				      Z_DEFAULT_STRATEGY)) {
+		printk(KERN_WARNING "deflateInit failed\n");
+		return -ENOMEM;
+        }
+	
+	empty_buf = vmalloc(1024);
+        if (!empty_buf) {
+		printk(KERN_WARNING "Failed to allocate 1024 bytes for dummy buffer\n");
+		return -ENOMEM;
+        }
+	memset (empty_buf, 0, 1024);
+	
+	crc = crc32 (0,0,0); /* init */
+#endif
+
 	/* first copy the parameters from user space */
 	memset(&psinfo, 0, sizeof(psinfo));
 	{
@@ -1154,7 +1843,15 @@
 	has_dumped = 1;
 	current->flags |= PF_DUMPCORE;
 
+#ifdef CONFIG_GZIP_COREDUMPS
+	/* write gzip header */
+	DUMP_WRITE(gz_magic, 10);
+
+	/* write elf header */
+	DUMP_GZ(&elf, sizeof(elf), &crc, &gz_stream);
+#else
 	DUMP_WRITE(&elf, sizeof(elf));
+#endif
 	offset += sizeof(elf);				/* Elf header */
 	offset += (segs+1) * sizeof(struct elf_phdr);	/* Program headers */
 
@@ -1239,7 +1936,12 @@
 		phdr.p_align = 0;
 
 		offset += phdr.p_filesz;
+
+#ifdef CONFIG_GZIP_COREDUMPS
+		DUMP_GZ(&phdr, sizeof(phdr), &crc, &gz_stream);
+#else
 		DUMP_WRITE(&phdr, sizeof(phdr));
+#endif
 	}
 
 	/* Page-align dumped data */
@@ -1264,14 +1966,27 @@
 		if (vma->vm_flags & VM_EXEC) phdr.p_flags |= PF_X;
 		phdr.p_align = ELF_EXEC_PAGESIZE;
 
+#ifdef CONFIG_GZIP_COREDUMPS
+		DUMP_GZ(&phdr, sizeof(phdr), &crc, &gz_stream);
+#else
 		DUMP_WRITE(&phdr, sizeof(phdr));
+#endif
 	}
 
-	for(i = 0; i < numnote; i++)
+	for(i = 0; i < numnote; i++) {
+#ifdef CONFIG_GZIP_COREDUMPS	
+		if (!writenote_gz(&notes[i], file, empty_buf, &crc, &gz_stream))
+			goto end_coredump;
+#else
 		if (!writenote(&notes[i], file))
 			goto end_coredump;
-
+#endif
+	}
+#ifdef CONFIG_GZIP_COREDUMPS	
+	PAD_GZ (dataoff-gz_stream.total_in, empty_buf, &crc, &gz_stream);
+#else
 	DUMP_SEEK(dataoff);
+#endif
 
 	for(vma = current->mm->mmap; vma != NULL; vma = vma->vm_next) {
 		unsigned long addr;
@@ -1290,16 +2005,28 @@
 			struct vm_area_struct *vma;
 
 			if (get_user_pages(current, current->mm, addr, 1, 0, 1,
-						&page, &vma) <= 0) {
-				DUMP_SEEK (file->f_pos + PAGE_SIZE);
+					   &page, &vma) <= 0) {	
+#ifdef CONFIG_GZIP_COREDUMPS
+			  PAD_GZ(PAGE_SIZE, empty_buf, &crc, &gz_stream);
+#else
+			  DUMP_SEEK (file->f_pos + PAGE_SIZE);
+#endif
 			} else {
-				if (page == ZERO_PAGE(addr)) {
-					DUMP_SEEK (file->f_pos + PAGE_SIZE);
+				if (page == ZERO_PAGE(addr)) {	
+#ifdef CONFIG_GZIP_COREDUMPS
+				  PAD_GZ(PAGE_SIZE, empty_buf, &crc, &gz_stream);
+#else
+				  DUMP_SEEK (file->f_pos + PAGE_SIZE);
+#endif
 				} else {
 					void *kaddr;
 					flush_cache_page(vma, addr);
 					kaddr = kmap(page);
+#ifdef CONFIG_GZIP_COREDUMPS
+					DUMP_GZ(kaddr, PAGE_SIZE, &crc, &gz_stream);
+#else
 					DUMP_WRITE(kaddr, PAGE_SIZE);
+#endif
 					flush_page_to_ram(page);
 					kunmap(page);
 				}
@@ -1308,15 +2035,37 @@
 		}
 	}
 
+#ifndef CONFIG_GZIP_COREDUMPS
 	if ((off_t) file->f_pos != offset) {
 		/* Sanity check */
 		printk("elf_core_dump: file->f_pos (%ld) != offset (%ld)\n",
 		       (off_t) file->f_pos, offset);
 	}
+#endif
 
- end_coredump:
+end_coredump:
+#ifdef CONFIG_GZIP_COREDUMPS
+	gz_finish (file, &gz_stream);
+	zlib_deflateEnd (&gz_stream);
+
+	gz_magic[0] = (crc & 0x000000FF);
+	gz_magic[1] = (crc & 0x0000FF00) >> 8;
+	gz_magic[2] = (crc & 0x00FF0000) >> 16;
+	gz_magic[3] = (crc & 0xFF000000) >> 24;
+	gz_magic[4] = (gz_stream.total_in & 0x000000FF);
+	gz_magic[5] = (gz_stream.total_in & 0x0000FF00) >> 8;
+	gz_magic[6] = (gz_stream.total_in & 0x00FF0000) >> 16;
+	gz_magic[7] = (gz_stream.total_in & 0xFF000000) >> 24;
+	dump_write (file, gz_magic, 8);
+#endif
 	set_fs(fs);
 	up_write(&current->mm->mmap_sem);
+
+#ifdef CONFIG_GZIP_COREDUMPS
+	vfree (deflate_workspace);
+	vfree (empty_buf);
+#endif
+
 	return has_dumped;
 }
 #endif		/* USE_ELF_CORE_DUMP */
diff -ur linux-2.4.28/lib/Config.in linux-2.4.28-patched/lib/Config.in
-- linux-2.4.28/lib/Config.in	2003-11-28 19:26:21.000000000 +0100
+++ linux-2.4.28-patched/lib/Config.in	2005-01-06 11:21:21.000000000 +0100
@@ -27,7 +27,8 @@
   fi
 fi
 
-if [ "$CONFIG_PPP_DEFLATE" = "y" -o \
+if [ "$CONFIG_GZIP_COREDUMPS" = "y" -o \
+     "$CONFIG_PPP_DEFLATE" = "y" -o \
      "$CONFIG_CRYPTO_DEFLATE" = "y" -o \
      "$CONFIG_JFFS2_FS" = "y" ]; then
    define_tristate CONFIG_ZLIB_DEFLATE y


             reply	other threads:[~2005-01-06 13:21 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2005-01-06 13:19 Jan Frey [this message]
2005-01-06 13:30 ` [PATCH] support for gzipped (ELF) core dumps linux-os
2005-01-06 13:43 ` Miquel van Smoorenburg
2005-01-08 17:27 Shaheed
2005-01-13 11:51 ` Jan Frey
2005-01-13 13:29   ` Shaheed

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