From 03f1f615e53cc1740f51b0178e6708443a4cb029 Mon Sep 17 00:00:00 2001
From: John Reiser <jreiser@BitWagon.com>
Date: Thu, 17 Jul 2003 01:46:48 +0000
Subject: [PATCH] filter 0x49 for [b]vmlinuz; 2nd parameter for ckt32
 (addvalue) 	p_vmlinz.cpp stub/macros.ash 	stub/l_lx_elf86.asm 
 stub/l_lx_exec86.asm 	stub/l_vmlinz.asm

committer: jreiser <jreiser> 1058406408 +0000
---
 src/p_vmlinz.cpp         |  2 +-
 src/stub/l_lx_elf86.asm  |  2 +-
 src/stub/l_lx_exec86.asm |  2 +-
 src/stub/l_vmlinz.asm    |  2 +-
 src/stub/macros.ash      | 26 ++++++++++++++++++--------
 5 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/src/p_vmlinz.cpp b/src/p_vmlinz.cpp
index 937b4e61..2d8b1af7 100644
--- a/src/p_vmlinz.cpp
+++ b/src/p_vmlinz.cpp
@@ -65,7 +65,7 @@ const int *PackVmlinuzI386::getCompressionMethods(int method, int level) const
 const int *PackVmlinuzI386::getFilters() const
 {
     static const int filters[] = {
-        /*0x49,*/  /* 2003-07-16 bug in unfilter? */
+        0x49,
         0x26, 0x24, 0x11, 0x14, 0x13, 0x16, 0x25, 0x15, 0x12,
     -1 };
     return filters;
diff --git a/src/stub/l_lx_elf86.asm b/src/stub/l_lx_elf86.asm
index 499308c9..08979e03 100644
--- a/src/stub/l_lx_elf86.asm
+++ b/src/stub/l_lx_elf86.asm
@@ -116,7 +116,7 @@ decompress:
                 ret
 
                 ctojr32
-                ckt32   dl
+                ckt32   edi, dl
 ;__LEXEC017__
                 popa
                 ret
diff --git a/src/stub/l_lx_exec86.asm b/src/stub/l_lx_exec86.asm
index 2e446a5a..814c6b46 100644
--- a/src/stub/l_lx_exec86.asm
+++ b/src/stub/l_lx_exec86.asm
@@ -135,7 +135,7 @@ decompress:
 ;;              jmpn lxunf0  ; logically belongs here
 
                 ctojr32
-                ckt32   dl
+                ckt32   edi, dl
 ;__LEXEC017__
                 popa
                 ret
diff --git a/src/stub/l_vmlinz.asm b/src/stub/l_vmlinz.asm
index 7779a23d..309812fe 100644
--- a/src/stub/l_vmlinz.asm
+++ b/src/stub/l_vmlinz.asm
@@ -120,7 +120,7 @@ checka20:
                 pop     ecx     ; MATCH05  len
                 pop     edx     ; MATCH04  cto
                 pop     edi     ; MATCH03  src
-                ckt32   dl
+                ckt32   0, dl
 %endif; __LZDUMMY2__
 %ifdef  __LZCALLT9__
                 pop     edi     ; MATCH03  src
diff --git a/src/stub/macros.ash b/src/stub/macros.ash
index 7bb06799..afd9a768 100644
--- a/src/stub/macros.ash
+++ b/src/stub/macros.ash
@@ -171,13 +171,18 @@ ctend:
 ;;  call/jump/jcc trick; also used more than once (and/or optionally), so
 ;;  ecx has byte count (not count of applied instances), and
 ;;  edi points to buffer.
-%macro          ckt32   1  ; param: where is cto8 (dl, bl, or literal)
+%macro          ckt32   2
+; 1st param: effective addvalue (typically 0 or edi; any rvalue)
+; 2nd param: where is cto8 (dl, bl, or literal)
+
 ;__CKLLTR00__
-                mov     esi, edi  ; base of block
+ %ifnidn %1,0
+                mov     esi, %1
+ %endif
                 jmps    ckstart
 ckloop3:
                 mov     al, [edi]
-                inc     edi
+                add     edi, byte 1
 ;__CKLLTR10__  Jcc only
                 cmp     al, 0x80  ; lo of 6-byte Jcc
                 jb      ckloop2
@@ -191,27 +196,32 @@ ckloop2:
                 cmp     al, 0xE9 - 0xE8
                 ja      ckcount
 ckmark:
-                cmp     byte [edi], %1  ; cto8
+                cmp     byte [edi], %2  ; cto8
                 jnz     ckcount
                 mov     eax, [edi]
 
                 shr     ax, 8
                 rol     eax, 16
                 xchg    al, ah
+; above 3 instr are equivalent to the following 2 instr:
+;               mov     al, 0   ; clear cto8  [setup partial-write stall]
+;               bswap   eax     ; not on 386: need 486 and up
 
                 sub     eax, edi
+ %ifnidn %1,0
                 add     eax, esi
+ %endif
                 mov     [edi], eax
                 add     edi, byte 4
 ckstart:
                 sub     ecx, byte 4
 ;__CKLLTR30__  Jcc only
                 mov     al, [edi]
-                inc     edi
+                add     edi, byte 1
                 loop    ckloop2  ; prefix cannot overlap previous displacement
 ;__CKLLTR40__
 ckcount:
-                dec     ecx
+                sub     ecx, byte 1
                 jg      ckloop3
 ckend:
 %endmacro
@@ -497,7 +507,7 @@ lxunf1:  ; allocate and clear mru[]
 ;__LXUNF030__
 lxctloop:
         movzx eax, word [edi]  ; 2 bytes, zero extended
-        inc edi
+        add edi, byte 1
 ;__LXJCC000__
         cmp al, 0x80  ; lo of Jcc <d32>
         jb lxct1
@@ -537,7 +547,7 @@ lxct3:
 
 ;__LXUNF034__
 unfcount:
-        dec ecx
+        sub ecx, byte 1
         jg lxctloop
 
 ;__LXMRU055__