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* autoload.cc (LoadDLLprime): Add jmp call to allow streamlining of later jmp

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rewrite.
(doit): Avoid use of cx register.  Just change one word to avoid races.
This commit is contained in:
Christopher Faylor 2002-07-20 04:59:15 +00:00
parent 504628e782
commit 5ec1dcc5bf
2 changed files with 15 additions and 8 deletions
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6
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,9 @@
2002-07-20 Christopher Faylor <cgf@redhat.com>
* autoload.cc (LoadDLLprime): Add jmp call to allow streamlining of
later jmp rewrite.
(doit): Avoid use of cx register. Just change one word to avoid races.
2002-07-18 Pierre Humblet <pierre.humblet@ieee.org> 2002-07-18 Pierre Humblet <pierre.humblet@ieee.org>
* security.cc (get_unix_group_sidlist): Create. * security.cc (get_unix_group_sidlist): Create.

17
winsup/cygwin/autoload.cc
View File

@ -84,9 +84,11 @@ details. */
.align 8 \n\ .align 8 \n\
_" mangle (name, n) ": \n\ _" mangle (name, n) ": \n\
_win32_" mangle (name, n) ": \n\ _win32_" mangle (name, n) ": \n\
movl (1f),%eax \n\ .byte 0xe9 \n\
.long -4 + 1f - . \n\
1:movl (2f),%eax \n\
call *(%eax) \n\ call *(%eax) \n\
1:.long ." #dllname "_info \n\ 2:.long ." #dllname "_info \n\
.long (" #n "+" #notimp ") | " #err "<<16 \n\ .long (" #n "+" #notimp ") | " #err "<<16 \n\
.asciz \"" #name "\" \n\ .asciz \"" #name "\" \n\
.text \n\ .text \n\
@ -153,12 +155,11 @@ dll_func_load: \n\
jne gotit # Yes \n\ jne gotit # Yes \n\
jmp noload # Issue an error or return \n\ jmp noload # Issue an error or return \n\
gotit: \n\ gotit: \n\
popl %ecx # Pointer to 'return address' \n\ popl %edx # Pointer to 'return address' \n\
movb $0xe9,-7(%ecx) # Turn preceding call to a jmp *%eax \n\ subl %edx,%eax # Make it relative \n\
movl %eax,%edx # Save \n\ addl $7,%eax # Tweak \n\
subl %ecx,%eax # Make it relative \n\ subl $12,%edx # Point to jmp \n\
addl $2,%eax # Tweak \n\ movl %eax,1(%edx) # Move relative address after jump \n\
movl %eax,-6(%ecx) # Move relative address after jump \n\
jmp *%edx # Jump to actual function \n\ jmp *%edx # Jump to actual function \n\
\n\ \n\
.global dll_chain \n\ .global dll_chain \n\