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GetProcAddress fix, comments

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git-svn-id: svn://kolibrios.org@6823 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
siemargl 2017-01-02 05:43:14 +00:00
parent 0a3c951b56
commit 48916984b1
1 changed files with 18 additions and 0 deletions
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18
programs/dll.inc
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@ -1,4 +1,9 @@
;-----------------------------------------------------------------------------
; load one or more DLL file in COFF format and try to import functions by our list
; if first function in import list begins with 'lib_', call it as DLL initialization
; return eax = 1 as fail, if anyone of .obj file not found in /sys/lib
; return 0 if all fine, but 0 not garantees in succesfull import - see dll.Link comment
; dirties all registers! eax, ebx, ecx, edx, esi, edi
proc dll.Load, import_table:dword
mov esi, [import_table]
.next_lib:
@ -37,6 +42,9 @@ proc dll.Load, import_table:dword
ret
endp
;-----------------------------------------------------------------------------
; scans dll export table for a functions we want to import
; break scan on first unresolved import
; no return value
proc dll.Link, exp:dword, imp:dword
push eax
mov esi, [imp]
@ -58,6 +66,8 @@ proc dll.Link, exp:dword, imp:dword
ret
endp
;-----------------------------------------------------------------------------
; calls lib_init with predefined parameters
; no return value
proc dll.Init, dllentry:dword
pushad
mov eax, mem.Alloc
@ -69,6 +79,8 @@ proc dll.Init, dllentry:dword
ret
endp
;-----------------------------------------------------------------------------
; scans export table for a sz_name function
; returns in eax function address or 0 if not found
proc dll.GetProcAddress, exp:dword, sz_name:dword
mov edx, [exp]
xor eax, eax
@ -85,9 +97,15 @@ proc dll.GetProcAddress, exp:dword, sz_name:dword
.ok:
mov eax, [edx + 4]
.end:
cmp eax, -1
jnz @f
xor eax, eax
@@:
ret
endp
;-----------------------------------------------------------------------------
; compares strings
; returns eax = 0 if equal, -1 otherwise
proc strcmp, str1:dword, str2:dword
push esi edi
mov esi, [str1]