diff options
Diffstat (limited to 'libs/context/src/asm/fcontext_i386_ms_pe_masm.asm')
| -rw-r--r-- | libs/context/src/asm/fcontext_i386_ms_pe_masm.asm | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/libs/context/src/asm/fcontext_i386_ms_pe_masm.asm b/libs/context/src/asm/fcontext_i386_ms_pe_masm.asm new file mode 100644 index 0000000000..0f4dd671b1 --- /dev/null +++ b/libs/context/src/asm/fcontext_i386_ms_pe_masm.asm @@ -0,0 +1,151 @@ + +; Copyright Oliver Kowalke 2009. +; Distributed under the Boost Software License, Version 1.0. +; (See accompanying file LICENSE_1_0.txt or copy at +; http://www.boost.org/LICENSE_1_0.txt) + +; -------------------------------------------------------------- +; | 0 | 1 | 2 | 3 | 4 | 5 | +; -------------------------------------------------------------- +; | 0h | 04h | 08h | 0ch | 010h | 014h | +; -------------------------------------------------------------- +; | EDI | ESI | EBX | EBP | ESP | EIP | +; -------------------------------------------------------------- +; -------------------------------------------------------------- +; | 6 | 7 | | +; -------------------------------------------------------------- +; | 018h | 01ch | | +; -------------------------------------------------------------- +; | ss_base | ss_limit| | +; -------------------------------------------------------------- +; -------------------------------------------------------------- +; | 8 | | +; -------------------------------------------------------------- +; | 020h | | +; -------------------------------------------------------------- +; |fc_execpt| | +; -------------------------------------------------------------- +; -------------------------------------------------------------- +; | 9 | | +; -------------------------------------------------------------- +; | 024h | | +; -------------------------------------------------------------- +; |fc_strage| | +; -------------------------------------------------------------- +; -------------------------------------------------------------- +; | 10 | 11 | | +; -------------------------------------------------------------- +; | 028h | 02ch | | +; -------------------------------------------------------------- +; | fc_mxcsr|fc_x87_cw| | +; -------------------------------------------------------------- + +.386 +.XMM +.model flat, c +_exit PROTO, value:SDWORD +align_stack PROTO, vp:DWORD +seh_fcontext PROTO, except:DWORD, frame:DWORD, context:DWORD, dispatch:DWORD +.code + +jump_fcontext PROC EXPORT + mov ecx, [esp+04h] ; load address of the first fcontext_t arg + mov [ecx], edi ; save EDI + mov [ecx+04h], esi ; save ESI + mov [ecx+08h], ebx ; save EBX + mov [ecx+0ch], ebp ; save EBP + + assume fs:nothing + mov edx, fs:[018h] ; load NT_TIB + assume fs:error + mov eax, [edx] ; load current SEH exception list + mov [ecx+020h], eax ; save current exception list + mov eax, [edx+04h] ; load current stack base + mov [ecx+018h], eax ; save current stack base + mov eax, [edx+08h] ; load current stack limit + mov [ecx+01ch], eax ; save current stack limit + mov eax, [edx+010h] ; load fiber local storage + mov [ecx+024h], eax ; save fiber local storage + + lea eax, [esp+04h] ; exclude the return address + mov [ecx+010h], eax ; save as stack pointer + mov eax, [esp] ; load return address + mov [ecx+014h], eax ; save return address + + mov edx, [esp+08h] ; load address of the second fcontext_t arg + mov edi, [edx] ; restore EDI + mov esi, [edx+04h] ; restore ESI + mov ebx, [edx+08h] ; restore EBX + mov ebp, [edx+0ch] ; restore EBP + + mov eax, [esp+010h] ; check if fpu enve preserving was requested + test eax, eax + je nxt + + stmxcsr [ecx+028h] ; save MMX control word + fnstcw [ecx+02ch] ; save x87 control word + ldmxcsr [edx+028h] ; restore MMX control word + fldcw [edx+02ch] ; restore x87 control word +nxt: + mov ecx, edx + assume fs:nothing + mov edx, fs:[018h] ; load NT_TIB + assume fs:error + mov eax, [ecx+020h] ; load SEH exception list + mov [edx], eax ; restore next SEH item + mov eax, [ecx+018h] ; load stack base + mov [edx+04h], eax ; restore stack base + mov eax, [ecx+01ch] ; load stack limit + mov [edx+08h], eax ; restore stack limit + mov eax, [ecx+024h] ; load fiber local storage + mov [edx+010h], eax ; restore fiber local storage + + mov eax, [esp+0ch] ; use third arg as return value after jump + + mov esp, [ecx+010h] ; restore ESP + mov [esp+04h], eax ; use third arg as first arg in context function + mov ecx, [ecx+014h] ; fetch the address to return to + + jmp ecx ; indirect jump to context +jump_fcontext ENDP + +make_fcontext PROC EXPORT + mov eax, [esp+04h] ; load address of the fcontext_t arg0 + mov [eax], eax ; save the address of passed context + mov ecx, [esp+08h] ; load the address of the context function + mov [eax+014h], ecx ; save the address of the context function + mov edx, [eax+018h] ; load the stack base + + push eax ; save pointer to fcontext_t + push edx ; stack pointer as arg for align_stack + call align_stack ; align stack + mov edx, eax ; begin of aligned stack + pop eax ; remove arg for align_stack + pop eax ; restore pointer to fcontext_t + + lea edx, [edx-014h] ; reserve space for last frame on stack, (ESP + 4) & 15 == 0 + mov [eax+010h], edx ; save the aligned stack + + mov ecx, seh_fcontext ; set ECX to exception-handler + mov [edx+0ch], ecx ; save ECX as SEH handler + mov ecx, 0ffffffffh ; set ECX to -1 + mov [edx+08h], ecx ; save ECX as next SEH item + lea ecx, [edx+08h] ; load address of next SEH item + mov [eax+02ch], ecx ; save next SEH + + stmxcsr [eax+028h] ; save MMX control word + fnstcw [eax+02ch] ; save x87 control word + + mov ecx, finish ; address of finish + mov [edx], ecx + + xor eax, eax + ret + +finish: + xor eax, eax + push eax ; exit code is zero + call _exit ; exit application + hlt +make_fcontext ENDP +END |