* fixed copy-on-write for kernel accesses from other threads
* fixed return value of read/write_process_memory * fixed sysfunction 39.4 broken in rev. 1304 * more safe and slightly more effective FDO git-svn-id: svn://kolibrios.org@1314 a494cfbc-eb01-0410-851d-a64ba20cac60
This commit is contained in:
Evgeny Grechnikov (Diamond)
parent
5da0aff00a
commit
d5cbc5f493
@ -714,14 +714,17 @@ end if
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jmp .exit
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endp
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align 4
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proc map_mem stdcall, lin_addr:dword,pdir:dword,\
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ofs:dword,buf_size:dword
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mov eax, [buf_size]
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test eax, eax
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; returns number of mapped bytes
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proc map_mem stdcall, lin_addr:dword,slot:dword,\
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ofs:dword,buf_size:dword,req_access:dword
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push 0 ; initialize number of mapped bytes
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cmp [buf_size], 0
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jz .exit
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mov eax, [pdir]
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mov eax, [slot]
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shl eax, 8
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mov eax, [SLOT_BASE+eax+APPDATA.dir_table]
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and eax, 0xFFFFF000
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stdcall map_page,[ipc_pdir],eax,PG_UW
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@ -753,10 +756,11 @@ proc map_mem stdcall, lin_addr:dword,pdir:dword,\
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and edx, 0x3FF
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mov esi, [ipc_ptab]
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.map: mov eax, [esi+edx*4]
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and eax, 0xFFFFF000
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jz .exit
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stdcall map_page,edi,eax,PG_UW
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.map:
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stdcall safe_map_page,[slot],[req_access],[ofs]
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jnc .exit
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add dword [ebp-4], 4096
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add [ofs], 4096
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dec ecx
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jz .exit
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add edi, 0x1000
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@ -773,20 +777,23 @@ proc map_mem stdcall, lin_addr:dword,pdir:dword,\
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jmp .map
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.exit:
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pop eax
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ret
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endp
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align 4
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proc map_memEx stdcall, lin_addr:dword,pdir:dword,\
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ofs:dword,buf_size:dword
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mov eax, [buf_size]
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test eax, eax
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proc map_memEx stdcall, lin_addr:dword,slot:dword,\
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ofs:dword,buf_size:dword,req_access:dword
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push 0 ; initialize number of mapped bytes
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cmp [buf_size], 0
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jz .exit
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mov eax, [pdir]
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mov eax, [slot]
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shl eax, 8
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mov eax, [SLOT_BASE+eax+APPDATA.dir_table]
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and eax, 0xFFFFF000
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stdcall map_page,[proc_mem_pdir],eax,dword PG_UW
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stdcall map_page,[proc_mem_pdir],eax,PG_UW
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mov ebx, [ofs]
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shr ebx, 22
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mov esi, [proc_mem_pdir]
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@ -795,7 +802,7 @@ proc map_memEx stdcall, lin_addr:dword,pdir:dword,\
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and eax, 0xFFFFF000
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test eax, eax
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jz .exit
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stdcall map_page,edi,eax,dword PG_UW
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stdcall map_page,edi,eax,PG_UW
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@@: mov edi, [lin_addr]
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and edi, 0xFFFFF000
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@ -809,21 +816,101 @@ proc map_memEx stdcall, lin_addr:dword,pdir:dword,\
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and edx, 0x3FF
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mov esi, [proc_mem_tab]
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.map: mov eax, [esi+edx*4]
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; and eax, 0xFFFFF000
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; test eax, eax
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; jz .exit
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stdcall map_page,edi,eax,dword PG_UW
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.map:
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stdcall safe_map_page,[slot],[req_access],[ofs]
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jnc .exit
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add dword [ebp-4], 0x1000
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add edi, 0x1000
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add [ofs], 0x1000
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inc edx
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dec ecx
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jnz .map
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.exit:
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pop eax
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ret
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endp
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; in: esi+edx*4 = pointer to page table entry
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; in: [slot], [req_access], [ofs] on the stack
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; in: edi = linear address to map
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; out: CF cleared <=> failed
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; destroys: only eax
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proc safe_map_page stdcall, slot:dword, req_access:dword, ofs:dword
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mov eax, [esi+edx*4]
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test al, PG_MAP
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jz .not_present
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test al, PG_WRITE
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jz .resolve_readonly
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; normal case: writable page, just map with requested access
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.map:
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stdcall map_page, edi, eax, [req_access]
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stc
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.fail:
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ret
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.not_present:
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; check for alloc-on-demand page
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test al, 2
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jz .fail
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; allocate new page, save it to source page table
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push ecx
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call alloc_page
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pop ecx
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test eax, eax
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jz .fail
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or al, PG_UW
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mov [esi+edx*4], eax
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jmp .map
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.resolve_readonly:
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; readonly page, probably copy-on-write
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; check: readonly request of readonly page is ok
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test [req_access], PG_WRITE
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jz .map
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; find control structure for this page
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pushf
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cli
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cld
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push ebx ecx
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mov eax, [slot]
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shl eax, 8
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mov eax, [SLOT_BASE+eax+APPDATA.dlls_list_ptr]
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test eax, eax
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jz .no_hdll
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mov ecx, [eax+HDLL.fd]
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.scan_hdll:
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cmp ecx, eax
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jz .no_hdll
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mov ebx, [ofs]
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and ebx, not 0xFFF
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sub ebx, [ecx+HDLL.base]
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cmp ebx, [ecx+HDLL.size]
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jb .hdll_found
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mov ecx, [ecx+HDLL.fd]
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jmp .scan_hdll
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.no_hdll:
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pop ecx ebx
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popf
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clc
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ret
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.hdll_found:
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; allocate page, save it in page table, map it, copy contents from base
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mov eax, [ecx+HDLL.parent]
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add ebx, [eax+DLLDESCR.data]
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call alloc_page
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test eax, eax
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jz .no_hdll
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or al, PG_UW
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mov [esi+edx*4], eax
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stdcall map_page, edi, eax, [req_access]
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push esi edi
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mov esi, ebx
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mov ecx, 4096/4
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rep movsd
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pop edi esi
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pop ecx ebx
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popf
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stc
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ret
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endp
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sys_IPC:
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;input:
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@ -907,15 +994,15 @@ proc sys_ipc_send stdcall, PID:dword, msg_addr:dword, msg_size:dword
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mov ecx, [ipc_tmp]
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cmp esi, 0x40000-0x1000 ; size of [ipc_tmp] minus one page
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jbe @f
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push eax esi edi
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push esi edi
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add esi,0x1000
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stdcall alloc_kernel_space,esi
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mov ecx, eax
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pop edi esi eax
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pop edi esi
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@@:
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mov [used_buf], ecx
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stdcall map_mem, ecx, [SLOT_BASE+eax+0xB8],\
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edi, esi
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stdcall map_mem, ecx, [dst_slot],\
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edi, esi, PG_SW
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mov edi, [dst_offset]
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add edi, [used_buf]
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@ -751,18 +751,22 @@ proc read_process_memory
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jna @F
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mov ecx, 0x8000
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@@:
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mov eax, [slot]
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shl eax,8
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mov ebx, [offset]
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push ecx
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stdcall map_memEx, [proc_mem_map],\
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[SLOT_BASE+eax+0xB8],\
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ebx, ecx
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[slot], ebx, ecx, PG_MAP
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pop ecx
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mov esi, [offset]
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and esi, 0xfff
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sub eax, esi
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jbe .ret
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cmp ecx, eax
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jbe @f
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mov ecx, eax
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mov [tmp_r_cnt], eax
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@@:
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add esi, [proc_mem_map]
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mov edi, [buff]
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mov edx, ecx
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@ -772,7 +776,7 @@ proc read_process_memory
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add [offset], edx
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sub [tmp_r_cnt], edx
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jnz .read_mem
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.ret:
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popad
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mov eax, [r_count]
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ret
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@ -818,18 +822,22 @@ proc write_process_memory
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jna @F
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mov ecx, 0x8000
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@@:
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mov eax, [slot]
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shl eax,8
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mov ebx, [offset]
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; add ebx, new_app_base
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push ecx
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stdcall map_memEx, [proc_mem_map],\
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[SLOT_BASE+eax+0xB8],\
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ebx, ecx
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[slot], ebx, ecx, PG_SW
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pop ecx
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mov edi, [offset]
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and edi, 0xfff
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sub eax, edi
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jbe .ret
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cmp ecx, eax
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jbe @f
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mov ecx, eax
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mov [tmp_w_cnt], eax
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@@:
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add edi, [proc_mem_map]
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mov esi, [buff]
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mov edx, ecx
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@ -839,7 +847,7 @@ proc write_process_memory
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add [offset], edx
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sub [tmp_w_cnt], edx
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jnz .read_mem
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.ret:
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popad
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mov eax, [w_count]
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ret
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@ -6,6 +6,7 @@
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$Revision$
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_esp equ esp
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;
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; Formatted Debug Output (FDO)
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@ -61,9 +62,11 @@ macro DEBUGS_N _sign,_num,[_str] {
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jmp ..label
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..str db _str,0
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..label:
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add esp,4*8+4
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; add esp,4*8+4
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esp equ esp+4*8+4
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mov edx,..str
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sub esp,4*8+4
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esp equ _esp
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; sub esp,4*8+4
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else
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mov edx,_str
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end if
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@ -147,7 +150,8 @@ macro DEBUGD_N _sign,_num,_dec {
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else if _dec eqtype 0
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mov eax,_dec
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else
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add esp,4*8+4
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; add esp,4*8+4
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esp equ esp+4*8+4
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if _num eq
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mov eax,dword _dec
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else if _num = 1
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@ -165,7 +169,8 @@ macro DEBUGD_N _sign,_num,_dec {
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else
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mov eax,dword _dec
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end if
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sub esp,4*8+4
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esp equ _esp
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; sub esp,4*8+4
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end if
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mov cl,_sign
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call fdo_debug_outdec
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@ -215,9 +220,11 @@ macro DEBUGH_N _sign,_num,_hex {
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else if _hex eqtype 0
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mov eax,_hex
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else
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add esp,4*8+4
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; add esp,4*8+4
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esp equ esp+4*8+4
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mov eax,dword _hex
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sub esp,4*8+4
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esp equ _esp
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; sub esp,4*8+4
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end if
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if ~_num eq
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mov edx,_num
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@ -2604,6 +2604,7 @@ nogb1:
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nogb2:
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; cmp eax,4 ; TILED / STRETCHED
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dec ebx
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dec ebx
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jnz nogb4
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mov eax,[BgrDrawMode]
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