feat: new syscall: sigpending, sigsuspend

[lunaix-os.git] / lunaix-os / kernel / asm / x86 / interrupt.S

diff --git a/lunaix-os/kernel/asm/x86/interrupt.S b/lunaix-os/kernel/asm/x86/interrupt.S
index e9419837ab5b6c07ea36b9a23173b4aec3d15ba4..8a43aa7467c114d5cd6d7a31e32ad66b6256bf03 100644 (file)
--- a/lunaix-os/kernel/asm/x86/interrupt.S
+++ b/lunaix-os/kernel/asm/x86/interrupt.S
@@ -22,6 +22,12 @@
         .skip 16
 #endif
 
         .skip 16
 #endif
 

+.section .bss
+    .align 16
+    lo_tmp_stack:
+        .skip 128
+    tmp_stack:
+

 .section .text
     isr_template FAULT_DIVISION_ERROR
     isr_template FAULT_GENERAL_PROTECTION, no_error_code=0
 .section .text
     isr_template FAULT_DIVISION_ERROR
     isr_template FAULT_GENERAL_PROTECTION, no_error_code=0


@@ -111,6 +117,11 @@
     soft_iret:
         movl %eax, %esp
 
     soft_iret:
         movl %eax, %esp
 

+#ifdef __ASM_INTR_DIAGNOSIS
+        movl 56(%esp), %eax
+        movl %eax, (debug_resv + 4)
+#endif
+

         popl %eax
         popl %ebx
         popl %ecx
         popl %eax
         popl %ebx
         popl %ecx


@@ -128,40 +139,51 @@
 
         addl $8, %esp
 
 
         addl $8, %esp
 

-#ifdef __ASM_INTR_DIAGNOSIS

         pushl %eax
         pushl %eax

+#ifdef __ASM_INTR_DIAGNOSIS

         movl 4(%esp), %eax
         movl %eax, debug_resv
         movl 4(%esp), %eax
         movl %eax, debug_resv

-        popl %eax

 #endif
 #endif

+        # 处理TSS.ESP的一些边界条件。如果是正常iret（即从内核模式*优雅地*退出）
+        # 那么TSS.ESP0应该为iret进行弹栈后，%esp的值。
+        # 所以这里的边界条件是：如返回用户模式，iret会额外弹出8个字节（ss,esp）
+        movl 8(%esp), %eax
+        andl $3, %eax
+        setnz %al
+        shll $3, %eax
+        addl $16, %eax
+        addl %esp, %eax
+        movl %eax, (_tss + 4)
+        popl %eax

         iret
 
     .global switch_to
     switch_to:
         # 约定
         iret
 
     .global switch_to
     switch_to:
         # 约定

-        # arg1: 目标进程PCB地址 (next)
-        popl %ecx               # next
-
-        call signal_dispatch    # kernel/signal.c
-        movl %eax, %edx
+        # arg1: 目标进程PCB地址 (next

 
 

+        popl %ebx               # next

         movl __current, %eax    
         movl __current, %eax    

-        movl 88(%eax), %ebx     # __current->pagetable
-        movl 88(%ecx), %eax     # next->pagetable
+        movl 88(%eax), %ecx     # __current->pagetable
+        movl 88(%ebx), %eax     # next->pagetable

         
         

-        cmpl %ebx, %eax         # if(next->pagtable != __current->pagetable) {
+        cmpl %ecx, %eax         # if(next->pagtable != __current->pagetable) {

         jz 1f
         movl %eax, %cr3         #   cpu_lcr3(next->pagetable)
                                 # }
     1:
         jz 1f
         movl %eax, %cr3         #   cpu_lcr3(next->pagetable)
                                 # }
     1:

-        movl %ecx, __current    # __current = next
+        movl %ebx, __current    # __current = next
+
+        # 我们已经处在了新的地址空间，为了避免影响其先前的栈布局
+        # 需要使用一个临时的栈空间
+        movl $tmp_stack, %esp
+        call signal_dispatch    # kernel/signal.c

 
 

-        test %edx, %edx         # do we have signal to handle?
+        test %eax, %eax         # do we have signal to handle?

         jz 1f
         jz 1f

-        movl %edx, %eax

         jmp handle_signal
     1:
         jmp handle_signal
     1:

-        leal 8(%ecx), %eax
+        leal 8(%ebx), %eax

         jmp soft_iret
 
     .global handle_signal
         jmp soft_iret
 
     .global handle_signal


@@ -170,7 +192,7 @@
         # 注意2：handle_signal在调用之前，须确保proc_sig已经写入用户栈！
         leal 8(%eax), %ebx      # arg1 in %eax: addr of proc_sig structure in user stack
 
         # 注意2：handle_signal在调用之前，须确保proc_sig已经写入用户栈！
         leal 8(%eax), %ebx      # arg1 in %eax: addr of proc_sig structure in user stack
 

-        pushl 72(%ebx)          # proc_sig->prev_context.ss
+        pushl $UDATA_SEG        # proc_sig->prev_context.ss

         pushl %eax              # esp
         pushl 64(%ebx)          # proc_sig->prev_context.eflags
         pushl $UCODE_SEG        # cs
         pushl %eax              # esp
         pushl 64(%ebx)          # proc_sig->prev_context.eflags
         pushl $UCODE_SEG        # cs