Merge branch 'iret' into 'master'

修改中断返回指令对应的微程序 See merge request engintime/Dream-Logic/Intel-classic-chips/8086!15

Merge branch 'iret' into 'master'
68d72d17 · 李川 · 4614dea2 · 760789d3 · 68d72d17 · 68d72d17
--- a/8086.dlsche
+++ b/8086.dlsche
--- a/8086.dlsche.svg
+++ b/8086.dlsche.svg
--- a/CU.dlsche
+++ b/CU.dlsche
--- a/CU.dlsche.svg
+++ b/CU.dlsche.svg
--- a/rom.dbg
+++ b/rom.dbg
--- a/rom.lst
+++ b/rom.lst
--- a/rom.masm
+++ b/rom.masm
@@ -883,26 +883,30 @@ dup 6, null


 ;====================================================================================================
-; 硬中断返回指令，执行出栈操作
+; 中断返回指令，执行出栈操作，后进先出
 ;93. iret
-; 先恢复标志寄存器内容，即标志寄存器FLAG出栈
 inc pc
 path [pc], ir
-path sp, a
-path alu_inc, mar
-path [mar], flag

 ; 恢复中断返回地址，即中断返回地址出栈
 path sp, mar
 path [mar], pc

-; 更新栈顶
+; 出栈后栈顶指针寄存器sp加1，指向先于返回地址入栈的对象
 path sp, a
-path alu_inc, a
 path alu_inc, sp
+
+; 恢复标志寄存器内容，即标志寄存器FLAG出栈
+path sp, mar
+path [mar], flag
+
+; 出栈后栈顶指针寄存器sp加1，指向先于标志寄存器入栈的对象
+path sp, a
+path alu_inc, sp
+check irq
 reset upc

-dup 5, null
+dup 4, null


 ;====================================================================================================

--- a/rom.rxm
+++ b/rom.rxm
-GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG߿GGGGGGGGGGGGGG?_GG߿GGGGG?G?GGGG߿G߿߿GG
\ No newline at end of file
+GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG߿GGGGGGGGGGGGGG?_GG߿GGпGGG?G?GGGG߿G߿߿GG
\ No newline at end of file