[PATCH v9 0/5] Improve stack unwind on ppc64
by Aditya Gupta
The Problem:
============
Currently crash is unable to show function arguments and local variables, as
gdb can do. And functionality for moving between frames ('up'/'down') is not
working in crash.
Crash has 'gdb passthroughs' for things gdb can do, but the gdb passthroughs
'bt', 'frame', 'info locals', 'up', 'down' are not working either, due to
gdb not getting the register values from `crash_target::fetch_registers`,
which then uses `machdep->get_cpu_reg`, which is not implemented for PPC64
Proposed Solution:
==================
Fix the gdb passthroughs by implementing "machdep->get_cpu_reg" for PPC64.
This way, "gdb mode in crash" will support this feature for both ELF and
kdump-compressed vmcore formats, while "gdb" would only have supported ELF
format
This way other features of 'gdb', such as seeing
backtraces/registers/variables/arguments/local variables, moving up and
down stack frames, can be used with any ppc64 vmcore, irrespective of
being ELF format or kdump-compressed format.
Note: This doesn't support live debugging on ppc64, since registers are not
available to be read
Implications on Architectures:
====================================
No architecture other than PPC64 has been affected, other than in case of
'frame' command
As mentioned in patch #2, since frame will not be prohibited, so it will print:
crash> frame
#0 <unavailable> in ?? ()
Instead of before prohibited message:
crash> frame
crash: prohibited gdb command: frame
Major change will be in 'gdb mode' on PPC64, that it will print the frames, and
local variables, instead of failing with errors showing no frame, or showing
that couldn't get PC, it will be able to give all this information.
Testing:
========
Git tree with this patch series applied:
https://github.com/adi-g15-ibm/crash/tree/stack-unwind-v9
To test various gdb passthroughs:
(crash) set
(crash) set gdb on
gdb> thread
gdb> bt
gdb> info threads
gdb> info threads
gdb> info locals
gdb> info variables irq_rover_lock
gdb> info args
gdb> thread 2
gdb> set gdb off
(crash) set
(crash) set -c 6
(crash) gdb thread
(crash) bt
(crash) gdb bt
(crash) frame
(crash) gdb up
(crash) gdb down
(crash) info locals
Known Issues:
=============
1. In gdb mode, 'bt' might fail to show backtrace in few vmcores collected
from older kernels. This is a known issue due to register mismatch, and
its fix has been merged upstream:
This can also cause some 'invalid kernel virtual address' errors during gdb
unwinding the stack registers
Commit: https://github.com/torvalds/linux/commit/b684c09f09e7a6af3794d4233ef78581...
Fixing GDB passthroughs on other architectures
==============================================
Much of the work for making gdb passthroughs like 'gdb bt', 'gdb
thread', 'gdb info locals' etc. has been done by the patches introducing
'machdep->get_cpu_reg' and this series fixing some issues in that.
Other architectures should be able to fix these gdb functionalities by
simply implementing 'machdep->get_cpu_reg (cpu, regno, ...)'.
The reasoning behind that has been explained with a diagram in commit
description of patch #1
I will assist with my findings/observations fixing it on ppc64 whenever needed.
Changelog:
==========
V9:
+ minor change in patch #5: sync gdb context on a 'set' and 'set -p'
+ add taoliu's patch for using current context, and fixes in ppc64_get_cpu_reg
V8:
+ use get_active_task instead of depending on CURRENT_CONTEXT in ppc64_get_cpu_reg
+ rebase to upstream/master (5977936c0a91)
V7:
+ move changes in gdb-10.2.patch to the end (minor change in patch #3,4,5)
+ fix a memory leak in ppc64_get_cpu_reg (minor change in patch #1)
+ use ascii diagram in patch #1 description
V6:
+ changes in patch #5: fix bug introduced in v5 that caused initial gdb thread
to be thread 1
V5:
+ changes in patch #1: made ppc64_get_cpu_reg static, and remove unreachable
code
+ changes in patch #3: fixed typo 'ppc64_renum' instead of 'ppc64_regnum',
remove unneeded if condition
+ changes in patch #5: implement refresh regcache on per thread, instead of all
threads at once
V4:
+ fix segmentation fault in live debugging (change in patch #1)
+ mention live debugging not supported in cover letter and patch #1
+ fixed some checkpatch warnings (change in patch #5)
V3:
+ default gdb thread will be the crashing thread, instead of being
thread '0'
+ synchronise crash cpu and gdb thread context
+ fix bug in gdb_interface, that replaced gdb's output stream, losing
output in some cases, such as info threads and extra output in info
variables
+ fix 'info threads'
RFC V2:
- removed patch implementing 'frame', 'up', 'down' in crash
- updated the cover letter by removing the mention of those commands other
than the respective gdb passthrough
Aditya Gupta (5):
ppc64: correct gdb passthroughs by implementing machdep->get_cpu_reg
remove 'frame' from prohibited commands list
synchronise cpu context changes between crash/gdb
fix gdb_interface: restore gdb's output streams at end of
gdb_interface
fix 'info threads' command
crash_target.c | 44 ++++++++++++++++
defs.h | 130 +++++++++++++++++++++++++++++++++++++++++++++++-
gdb-10.2.patch | 110 +++++++++++++++++++++++++++++++++++++++-
gdb_interface.c | 2 +-
kernel.c | 47 +++++++++++++++--
ppc64.c | 95 +++++++++++++++++++++++++++++++++--
task.c | 14 ++++++
tools.c | 2 +-
8 files changed, 434 insertions(+), 10 deletions(-)
--
2.41.0
8 months, 3 weeks
Re: Adding the zram decompression algorithm "lzo-rle" to support kernel versions >= 5.1
by HAGIO KAZUHITO(萩尾 一仁)
On 2024/03/01 12:24, Yulong TANG 汤玉龙 wrote:
> Hi Kazu,
>
> I have tried to decompress lzo-rle using the same approach as lzo, with
> only the following modifications:
>
> if (STREQ(name, "lzo")) ---> if (STREQ(name, "lzo") ||
> STREQ(name, "lzo-rle"))
>
>
> but the result is not successful.
>
> crash> gcore -v 0 1
>
> gcore: WARNING: zram decompress error
> gcore: WARNING: zram decompress error
> gcore: WARNING: zram decompress error
thank you for trying.
>
>
> Or is there a specific function in the lzo library for decompressing
> lzo-rle?
Is v2.10 [1] the latest upstream version? Then probably there is no
library for it. ok let's import the source code..
[1] http://www.oberhumer.com/opensource/lzo/
Thanks,
Kazu
8 months, 3 weeks
crash8.0.4 cannot get source line nums of functions from ko on android15-k6.6
by 王天明 (Tianming Wang)
Hi
I use crash8.0.4_arm64 to parse the ramdump of android15-k6.6, load the symbol of ko,
and disassemble the functions in ko through the "dis -lx" command.
I can get the assembly instructions, but I cannot get the corresponding assembly instructions. lines of source code.
The following error is reported when using the command
GNU_RESOLVE_TEXT_ADDR: returned via gdb_error_hook (1 buffer in use)
GNU_GET_FUNCTION_RANGE: returned via gdb_error_hook (1 buffer in use
I use the disassembly tool that comes with Android, such as objdump, to disassemble ko.
I can see the code lines corresponding to the functions in ko..
So, is this a problem with the gdb tool or is there something wrong with my ko symbol?
Thanks a lot.
________________________________
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8 months, 3 weeks
[PATCH v2 ] Adding the zram decompression algorithm "lzo-rle" to support kernel versions >= 5.1
by Tang Yulong
In Linux 5.1, the ZRAM block driver has changed its default compressor from "lzo" to "lzo-rle" to enhance LZO compression support. However, crash does not support the improved LZO algorithm, resulting in failure when reading memory.
change default compressor : ce82f19fd5809f0cf87ea9f753c5cc65ca0673d6
The issue was discovered when using the extension 'gcore' to generate a process coredump, which was found to be incomplete and unable to be opened properly with gdb.
This patch is for Crash-utility tool, it enables the Crash-utility to support decompression of the "lzo-rle" compression algorithm used in zram. The patch has been tested with vmcore files from kernel version 5.4, and successfully allows reading of memory compressed with the zram compression algorithm.
Testing:
========
before apply this patch :
crash> gcore -v 0 1
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
after:
crash> gcore -v 0 1
Saved core.1.init
Changelog:
==========
v2: keep the "if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)" related code of the copied kernel code, but change the "if defined" macro into a runtime check .
Thanks and regards,
Yulong
Patch:
==========
From 0e91de69e08c3d4087b84018bcbfe10be07b7f7b Mon Sep 17 00:00:00 2001
From: "yulong.tang" <yulong.tang(a)nio.com>
Date: Tue, 20 Feb 2024 15:09:49 +0800
Subject: [PATCH] Adding the zram decompression algorithm "lzo-rle" to support
kernel versions >= 5.1.
Port the improved decompression method for "lzo" in the kernel to support decompression of "lzorle". After the 5.1 version of the kernel, the default compression algorithm for zram was changed from "lzo" to "lzo-rle". the crash utility only supports decompression for "lzo", when parsing vmcore files that utilize zram compression, such as when using the gcore command to detach process core dump files, parsing cannot be completed successfully.
before:
crash> gcore -v 0 1
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
gcore: WARNING: only the lzo compressor is supported
after:
crash> gcore -v 0 1
Saved core.1.init
Signed-off-by: yulong.tang <yulong.tang(a)nio.com>
Reviewed-by: Tao Liu <ltao(a)redhat.com>
---
Makefile | 9 +-
defs.h | 1 +
diskdump.c | 15 +++
lzorle_decompress.c | 314 ++++++++++++++++++++++++++++++++++++++++++++
lzorle_decompress.h | 81 ++++++++++++
5 files changed, 418 insertions(+), 2 deletions(-)
create mode 100644 lzorle_decompress.c
create mode 100644 lzorle_decompress.h
diff --git a/Makefile b/Makefile
index 9e97313..ce0c070 100644
--- a/Makefile
+++ b/Makefile
@@ -74,7 +74,8 @@ CFILES=main.c tools.c global_data.c memory.c filesys.c help.c task.c \
xen_hyper.c xen_hyper_command.c xen_hyper_global_data.c \
xen_hyper_dump_tables.c kvmdump.c qemu.c qemu-load.c sadump.c ipcs.c \
ramdump.c vmware_vmss.c vmware_guestdump.c \
- xen_dom0.c kaslr_helper.c sbitmap.c maple_tree.c
+ xen_dom0.c kaslr_helper.c sbitmap.c maple_tree.c \
+ lzorle_decompress.c
SOURCE_FILES=${CFILES} ${GENERIC_HFILES} ${MCORE_HFILES} \
${REDHAT_CFILES} ${REDHAT_HFILES} ${UNWIND_HFILES} \
@@ -94,7 +95,8 @@ OBJECT_FILES=main.o tools.o global_data.o memory.o filesys.o help.o task.o \
xen_hyper.o xen_hyper_command.o xen_hyper_global_data.o \
xen_hyper_dump_tables.o kvmdump.o qemu.o qemu-load.o sadump.o ipcs.o \
ramdump.o vmware_vmss.o vmware_guestdump.o \
- xen_dom0.o kaslr_helper.o sbitmap.o maple_tree.o
+ xen_dom0.o kaslr_helper.o sbitmap.o maple_tree.o \
+ lzorle_decompress.o
MEMORY_DRIVER_FILES=memory_driver/Makefile memory_driver/crash.c memory_driver/README
@@ -546,6 +548,9 @@ bpf.o: ${GENERIC_HFILES} bpf.c
maple_tree.o: ${GENERIC_HFILES} ${MAPLE_TREE_HFILES} maple_tree.c
${CC} -c ${CRASH_CFLAGS} maple_tree.c ${WARNING_OPTIONS} ${WARNING_ERROR}
+lzorle_decompress.o: lzorle_decompress.c
+ ${CC} -c ${CRASH_CFLAGS} lzorle_decompress.c ${WARNING_OPTIONS} ${WARNING_ERROR}
+
${PROGRAM}: force
@$(MAKE) all
diff --git a/defs.h b/defs.h
index 98650e8..c2c3fba 100644
--- a/defs.h
+++ b/defs.h
@@ -51,6 +51,7 @@
#include <regex.h>
#ifdef LZO
#include <lzo/lzo1x.h>
+#include "lzorle_decompress.h"
#endif
#ifdef SNAPPY
#include <snappy-c.h>
diff --git a/diskdump.c b/diskdump.c
index 3ae7bf2..e324a2e 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -3068,6 +3068,21 @@ try_zram_decompress(ulonglong pte_val, unsigned char *buf, ulong len, ulonglong
"zram decompress error: this executable needs to be built"
" with lzo library\n");
return 0;
+#endif
+ } else if (STREQ(name, "lzo-rle")) {
+#ifdef LZO
+ if (!(dd->flags & LZO_SUPPORTED)) {
+ if (lzo_init() == LZO_E_OK)
+ dd->flags |= LZO_SUPPORTED;
+ else
+ return 0;
+ }
+ decompressor = (void *)&lzorle_decompress_safe;
+#else
+ error(WARNING,
+ "zram decompress error: this executable needs to be built"
+ " with lzo-rle library\n");
+ return 0;
#endif
} else { /* todo: support more compressor */
error(WARNING, "only the lzo compressor is supported\n");
diff --git a/lzorle_decompress.c b/lzorle_decompress.c
new file mode 100644
index 0000000..55900c3
--- /dev/null
+++ b/lzorle_decompress.c
@@ -0,0 +1,314 @@
+/* lzorle_decompress.h
+ *
+ * from kernel lib/lzo/lzo1x_decompress_safe.c
+ *
+ * Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus(a)oberhumer.com>
+ * Copyright (C) 2024 NIO
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include "lzorle_decompress.h"
+#include <stdint.h>
+#include <string.h>
+
+#include "defs.h"
+
+/* This MAX_255_COUNT is the maximum number of times we can add 255 to a base
+ * count without overflowing an integer. The multiply will overflow when
+ * multiplying 255 by more than MAXINT/255. The sum will overflow earlier
+ * depending on the base count. Since the base count is taken from a u8
+ * and a few bits, it is safe to assume that it will always be lower than
+ * or equal to 2*255, thus we can always prevent any overflow by accepting
+ * two less 255 steps. See Documentation/lzo.txt for more information.
+ */
+#define MAX_255_COUNT ((((unsigned long)~0) / 255) - 2)
+
+static uint16_t get_unaligned_le16(const void *p) {
+ uint16_t value;
+ memcpy(&value, p, sizeof(uint16_t));
+ return value;
+}
+
+int lzorle_decompress_safe(const unsigned char *in, unsigned long in_len,
+ unsigned char *out, unsigned long *out_len, void *other/* NOT USED */) {
+ unsigned char *op;
+ const unsigned char *ip;
+ unsigned long t, next;
+ unsigned long state = 0;
+ const unsigned char *m_pos;
+ const unsigned char * const ip_end = in + in_len;
+ unsigned char * const op_end = out + *out_len;
+
+ unsigned char bitstream_version;
+
+ bool efficient_unaligned_access = (get_kernel_config("CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS", NULL) == IKCONFIG_Y);
+
+ op = out;
+ ip = in;
+
+ if (in_len < 3)
+ goto input_overrun;
+
+ if (in_len >= 5 && *ip == 17) {
+ bitstream_version = ip[1];
+ ip += 2;
+ } else {
+ bitstream_version = 0;
+ }
+
+ if (*ip > 17) {
+ t = *ip++ - 17;
+ if (t < 4) {
+ next = t;
+ goto match_next;
+ }
+ goto copy_literal_run;
+ }
+
+ for (;;) {
+ t = *ip++;
+ if (t < 16) {
+ if (state == 0) {
+ if (t == 0) {
+ unsigned long offset;
+ const unsigned char *ip_last = ip;
+
+ while (*ip == 0) {
+ ip++;
+ NEED_IP(1);
+ }
+ offset = ip - ip_last;
+ if (offset > MAX_255_COUNT)
+ return LZO_E_ERROR;
+
+ offset = (offset << 8) - offset;
+ t += offset + 15 + *ip++;
+ }
+ t += 3;
+copy_literal_run:
+ if (efficient_unaligned_access) {
+ if (HAVE_IP(t + 15) && HAVE_OP(t + 15)) {
+ const unsigned char *ie = ip + t;
+ unsigned char *oe = op + t;
+ do {
+ COPY8(op, ip);
+ op += 8;
+ ip += 8;
+ COPY8(op, ip);
+ op += 8;
+ ip += 8;
+ } while (ip < ie);
+ ip = ie;
+ op = oe;
+ } else {
+ NEED_OP(t);
+ NEED_IP(t + 3);
+ do {
+ *op++ = *ip++;
+ } while (--t > 0);
+ }
+ } else {
+ NEED_OP(t);
+ NEED_IP(t + 3);
+ do {
+ *op++ = *ip++;
+ } while (--t > 0);
+ }
+ state = 4;
+ continue;
+ } else if (state != 4) {
+ next = t & 3;
+ m_pos = op - 1;
+ m_pos -= t >> 2;
+ m_pos -= *ip++ << 2;
+ TEST_LB(m_pos);
+ NEED_OP(2);
+ op[0] = m_pos[0];
+ op[1] = m_pos[1];
+ op += 2;
+ goto match_next;
+ } else {
+ next = t & 3;
+ m_pos = op - (1 + M2_MAX_OFFSET);
+ m_pos -= t >> 2;
+ m_pos -= *ip++ << 2;
+ t = 3;
+ }
+ } else if (t >= 64) {
+ next = t & 3;
+ m_pos = op - 1;
+ m_pos -= (t >> 2) & 7;
+ m_pos -= *ip++ << 3;
+ t = (t >> 5) - 1 + (3 - 1);
+ } else if (t >= 32) {
+ t = (t & 31) + (3 - 1);
+ if (t == 2) {
+ unsigned long offset;
+ const unsigned char *ip_last = ip;
+
+ while (*ip == 0) {
+ ip++;
+ NEED_IP(1);
+ }
+ offset = ip - ip_last;
+ if (offset > MAX_255_COUNT)
+ return LZO_E_ERROR;
+
+ offset = (offset << 8) - offset;
+ t += offset + 31 + *ip++;
+ NEED_IP(2);
+ }
+ m_pos = op - 1;
+
+ next = get_unaligned_le16(ip);
+ ip += 2;
+ m_pos -= next >> 2;
+ next &= 3;
+ } else {
+ NEED_IP(2);
+ next = get_unaligned_le16(ip);
+ if (((next & 0xfffc) == 0xfffc) &&
+ ((t & 0xf8) == 0x18) &&
+ bitstream_version) {
+ NEED_IP(3);
+ t &= 7;
+ t |= ip[2] << 3;
+ t += MIN_ZERO_RUN_LENGTH;
+ NEED_OP(t);
+ memset(op, 0, t);
+ op += t;
+ next &= 3;
+ ip += 3;
+ goto match_next;
+ } else {
+ m_pos = op;
+ m_pos -= (t & 8) << 11;
+ t = (t & 7) + (3 - 1);
+ if (t == 2) {
+ unsigned long offset;
+ const unsigned char *ip_last = ip;
+
+ while (*ip == 0) {
+ ip++;
+ NEED_IP(1);
+ }
+ offset = ip - ip_last;
+ if (offset > MAX_255_COUNT)
+ return LZO_E_ERROR;
+
+ offset = (offset << 8) - offset;
+ t += offset + 7 + *ip++;
+ NEED_IP(2);
+ next = get_unaligned_le16(ip);
+ }
+ ip += 2;
+ m_pos -= next >> 2;
+ next &= 3;
+ if (m_pos == op)
+ goto eof_found;
+ m_pos -= 0x4000;
+ }
+ }
+ TEST_LB(m_pos);
+
+ if (efficient_unaligned_access) {
+ if (op - m_pos >= 8) {
+ unsigned char *oe = op + t;
+ if (HAVE_OP(t + 15)) {
+ do {
+ COPY8(op, m_pos);
+ op += 8;
+ m_pos += 8;
+ COPY8(op, m_pos);
+ op += 8;
+ m_pos += 8;
+ } while (op < oe);
+ op = oe;
+ if (HAVE_IP(6)) {
+ state = next;
+ COPY4(op, ip);
+ op += next;
+ ip += next;
+ continue;
+ }
+ } else {
+ NEED_OP(t);
+ do {
+ *op++ = *m_pos++;
+ } while (op < oe);
+ }
+ } else {
+ unsigned char *oe = op + t;
+ NEED_OP(t);
+ op[0] = m_pos[0];
+ op[1] = m_pos[1];
+ op += 2;
+ m_pos += 2;
+ do {
+ *op++ = *m_pos++;
+ } while (op < oe);
+ }
+ } else {
+ unsigned char *oe = op + t;
+ NEED_OP(t);
+ op[0] = m_pos[0];
+ op[1] = m_pos[1];
+ op += 2;
+ m_pos += 2;
+ do {
+ *op++ = *m_pos++;
+ } while (op < oe);
+ }
+match_next:
+ state = next;
+ t = next;
+ if (efficient_unaligned_access) {
+ if (HAVE_IP(6) && HAVE_OP(4)) {
+ COPY4(op, ip);
+ op += t;
+ ip += t;
+ } else {
+ NEED_IP(t + 3);
+ NEED_OP(t);
+ while (t > 0) {
+ *op++ = *ip++;
+ t--;
+ }
+ }
+ } else {
+ NEED_IP(t + 3);
+ NEED_OP(t);
+ while (t > 0) {
+ *op++ = *ip++;
+ t--;
+ }
+ }
+ }
+
+eof_found:
+ *out_len = op - out;
+ return (t != 3 ? LZO_E_ERROR :
+ ip == ip_end ? LZO_E_OK :
+ ip < ip_end ? LZO_E_INPUT_NOT_CONSUMED : LZO_E_INPUT_OVERRUN);
+
+input_overrun:
+ *out_len = op - out;
+ return LZO_E_INPUT_OVERRUN;
+
+output_overrun:
+ *out_len = op - out;
+ return LZO_E_OUTPUT_OVERRUN;
+
+lookbehind_overrun:
+ *out_len = op - out;
+ return LZO_E_LOOKBEHIND_OVERRUN;
+}
\ No newline at end of file
diff --git a/lzorle_decompress.h b/lzorle_decompress.h
new file mode 100644
index 0000000..c7dfd70
--- /dev/null
+++ b/lzorle_decompress.h
@@ -0,0 +1,81 @@
+/* lzorle_decompress.h
+ *
+ * from kernel lib/lzo/lzodefs.h
+ *
+ * Copyright (C) 1996-2012 Markus F.X.J. Oberhumer <markus(a)oberhumer.com>
+ * Copyright (C) 2024 NIO
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef LZODEFS_H
+#define LZODEFS_H
+
+#define COPY4(dst, src) memcpy((dst), (src), sizeof(uint32_t))
+#define COPY8(dst, src) memcpy((dst), (src), sizeof(uint64_t))
+
+#define M1_MAX_OFFSET 0x0400
+#define M2_MAX_OFFSET 0x0800
+#define M3_MAX_OFFSET 0x4000
+#define M4_MAX_OFFSET_V0 0xbfff
+#define M4_MAX_OFFSET_V1 0xbffe
+
+#define M1_MIN_LEN 2
+#define M1_MAX_LEN 2
+#define M2_MIN_LEN 3
+#define M2_MAX_LEN 8
+#define M3_MIN_LEN 3
+#define M3_MAX_LEN 33
+#define M4_MIN_LEN 3
+#define M4_MAX_LEN 9
+
+#define M1_MARKER 0
+#define M2_MARKER 64
+#define M3_MARKER 32
+#define M4_MARKER 16
+
+#define MIN_ZERO_RUN_LENGTH 4
+#define MAX_ZERO_RUN_LENGTH (2047 + MIN_ZERO_RUN_LENGTH)
+
+#define lzo_dict_t unsigned short
+#define D_BITS 13
+#define D_SIZE (1u << D_BITS)
+#define D_MASK (D_SIZE - 1)
+#define D_HIGH ((D_MASK >> 1) + 1)
+
+#define LZO_E_OK 0
+#define LZO_E_ERROR (-1)
+#define LZO_E_OUT_OF_MEMORY (-2)
+#define LZO_E_NOT_COMPRESSIBLE (-3)
+#define LZO_E_INPUT_OVERRUN (-4)
+#define LZO_E_OUTPUT_OVERRUN (-5)
+#define LZO_E_LOOKBEHIND_OVERRUN (-6)
+#define LZO_E_EOF_NOT_FOUND (-7)
+#define LZO_E_INPUT_NOT_CONSUMED (-8)
+#define LZO_E_NOT_YET_IMPLEMELZO_HFILESNTED (-9)
+#define LZO_E_INVALID_ARGUMENT (-10)
+
+#define HAVE_IP(x) ((unsigned long)(ip_end - ip) >= (unsigned long)(x))
+#define HAVE_OP(x) ((unsigned long)(op_end - op) >= (unsigned long)(x))
+#define NEED_IP(x) \
+ if (!HAVE_IP(x)) \
+ goto input_overrun
+#define NEED_OP(x) \
+ if (!HAVE_OP(x)) \
+ goto output_overrun
+#define TEST_LB(m_pos) \
+ if ((m_pos) < out) \
+ goto lookbehind_overrun
+
+int lzorle_decompress_safe(const unsigned char *in, unsigned long in_len,
+ unsigned char *out, unsigned long *out_len, void *other/* NOT USED */);
+
+#endif
\ No newline at end of file
--
2.25.1
8 months, 3 weeks
Re: Adding the zram decompression algorithm "lzo-rle" to support kernel versions >= 5.1
by Yulong TANG 汤玉龙
Hi Kazu,
I have tried to decompress lzo-rle using the same approach as lzo, with only the following modifications:
if (STREQ(name, "lzo")) ---> if (STREQ(name, "lzo") || STREQ(name, "lzo-rle"))
but the result is not successful.
crash> gcore -v 0 1
gcore: WARNING: zram decompress error
gcore: WARNING: zram decompress error
gcore: WARNING: zram decompress error
Or is there a specific function in the lzo library for decompressing lzo-rle?
Thanks,
Yulong
9 months
