kicad/thirdparty/libcontext/jump_i386_ms_pe_masm.asm

142 lines
3.7 KiB
NASM

; 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 | 6 | 7 |
; ---------------------------------------------------------------------------------
; | 0h | 04h | 08h | 0ch | 010h | 014h | 018h | 01ch |
; ---------------------------------------------------------------------------------
; | fc_mxcsr|fc_x87_cw| fc_strg |fc_deallo| limit | base | fc_seh | EDI |
; ---------------------------------------------------------------------------------
; ---------------------------------------------------------------------------------
; | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
; ---------------------------------------------------------------------------------
; | 020h | 024h | 028h | 02ch | 030h | 034h | 038h | 03ch |
; ---------------------------------------------------------------------------------
; | ESI | EBX | EBP | EIP | EXIT | | SEH NXT |SEH HNDLR|
; ---------------------------------------------------------------------------------
.386
.XMM
.model flat, c
.code
jump_fcontext PROC EXPORT
; fourth arg of jump_fcontext() == flag indicating preserving FPU
mov ecx, [esp+010h]
push ebp ; save EBP
push ebx ; save EBX
push esi ; save ESI
push edi ; save EDI
assume fs:nothing
; load NT_TIB into ECX
mov edx, fs:[018h]
assume fs:error
; load current SEH exception list
mov eax, [edx]
push eax
; load current stack base
mov eax, [edx+04h]
push eax
; load current stack limit
mov eax, [edx+08h]
push eax
; load current deallocation stack
mov eax, [edx+0e0ch]
push eax
; load fiber local storage
mov eax, [edx+010h]
push eax
; prepare stack for FPU
lea esp, [esp-08h]
; test for flag preserve_fpu
test ecx, ecx
je nxt1
; save MMX control- and status-word
stmxcsr [esp]
; save x87 control-word
fnstcw [esp+04h]
nxt1:
; first arg of jump_fcontext() == context jumping from
mov eax, [esp+030h]
; store ESP (pointing to context-data) in EAX
mov [eax], esp
; second arg of jump_fcontext() == context jumping to
mov edx, [esp+034h]
; third arg of jump_fcontext() == value to be returned after jump
mov eax, [esp+038h]
; restore ESP (pointing to context-data) from EDX
mov esp, edx
; test for flag preserve_fpu
test ecx, ecx
je nxt2
; restore MMX control- and status-word
ldmxcsr [esp]
; restore x87 control-word
fldcw [esp+04h]
nxt2:
; prepare stack for FPU
lea esp, [esp+08h]
assume fs:nothing
; load NT_TIB into ECX
mov edx, fs:[018h]
assume fs:error
; restore fiber local storage
pop ecx
mov [edx+010h], ecx
; restore current deallocation stack
pop ecx
mov [edx+0e0ch], ecx
; restore current stack limit
pop ecx
mov [edx+08h], ecx
; restore current stack base
pop ecx
mov [edx+04h], ecx
; restore current SEH exception list
pop ecx
mov [edx], ecx
pop edi ; save EDI
pop esi ; save ESI
pop ebx ; save EBX
pop ebp ; save EBP
; restore return-address
pop edx
; use value in EAX as return-value after jump
; use value in EAX as first arg in context function
mov [esp+04h], eax
; indirect jump to context
jmp edx
jump_fcontext ENDP
END