X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/48b4a227035048fdebcd32532deb7a857c6199ac..61bcf0c65dac58d2f29ab40e016489c89ec8eec0:/lunaix-os/kernel/asm/x86/interrupt.S?ds=sidebyside

diff --git a/lunaix-os/kernel/asm/x86/interrupt.S b/lunaix-os/kernel/asm/x86/interrupt.S
index 471a8e6..cd3f547 100644
--- a/lunaix-os/kernel/asm/x86/interrupt.S
+++ b/lunaix-os/kernel/asm/x86/interrupt.S
@@ -1,6 +1,8 @@
 #define __ASM__
 #include <arch/x86/interrupts.h>
-// #define __ASM_INTR_DIAGNOSIS
+#include <lunaix/common.h>
+#include <lunaix/syscall.h>
+#define __ASM_INTR_DIAGNOSIS
 
 .macro isr_template vector, no_error_code=1
     .global _asm_isr\vector
@@ -36,8 +38,40 @@
     isr_template PC_KBD_IV
 
     interrupt_wrapper:
+        /*
+         Stack layout (layout of struct isr_param)
+    msa:   [ss]
+           [esp]
+           eflags     > offset = 48 + 16 = 64
+           cs
+           eip
+           err_code   
+           vector     > offset = 28 + 16 + 4 = 48
+           esp
+           gs
+           fs
+           es
+           ds         > offset = 7 * 4 = 28
+           esi
+           ebp
+           edi
+           edx
+           ecx
+           ebx
+    lsa:   eax        > offset = 0
+
+            las: Least Significant Address
+            msa: Most Significant Address
+        */
+        cld
         pushl %esp
 
+        subl $16, %esp
+        movw %gs, 12(%esp)
+        movw %fs,  8(%esp)
+        movw %es,  4(%esp)
+        movw %ds,   (%esp)
+
         pushl %esi
         pushl %ebp
         pushl %edi
@@ -46,6 +80,23 @@
         pushl %ebx
         pushl %eax
 
+        movl 60(%esp), %eax   /* 取出 %cs */
+        andl $0x3, %eax          /* 判断 RPL */
+        jz 1f
+
+        movw $KDATA_SEG, %ax    /* 如果从用户模式转来，则切换至内核数据段 */
+        movw %ax, %gs
+        movw %ax, %fs
+        movw %ax, %ds
+        movw %ax, %es
+
+        # 保存用户栈顶指针。这是因为我们允许系统调用内进行上下文切换，而这样一来，我们就失去了用户栈的信息，
+        # 这样一来，就无法设置信号上下文。这主要是为了实现了pause()而做的准备
+        movl (__current), %eax  
+        movl 68(%esp), %ebx     # 取出esp
+        movl %ebx, 84(%eax)     # 存入__current->ustack_top
+
+    1:
         movl %esp, %eax
         andl $0xfffffff0, %esp
         subl $16, %esp
@@ -53,9 +104,11 @@
 
         call intr_handler
 
+        movl (%esp), %eax
+
     .global soft_iret
     soft_iret:
-        popl %esp
+        movl %eax, %esp
 
         popl %eax
         popl %ebx
@@ -64,19 +117,84 @@
         popl %edi
         popl %ebp
         popl %esi
-        popl %esp
+        
+        movw   (%esp), %ds
+        movw  4(%esp), %es
+        movw  8(%esp), %fs
+        movw 12(%esp), %gs
+
+        movl 16(%esp), %esp
 
         addl $8, %esp
 
 #ifdef __ASM_INTR_DIAGNOSIS
-        cmpl $0, (%esp)
-        jz 1f
-        iret
-1:
-        movl $__current, %eax
-        movl  (%esp), %ebx
-        movl $debug_resv, %ecx
-        ud2
-#else
-        iret
+        pushl %eax
+        movl 4(%esp), %eax
+        movl %eax, debug_resv
+        popl %eax
 #endif
+        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
+
+        movl __current, %eax    
+        movl 88(%eax), %ebx     # __current->pagetable
+        movl 88(%ecx), %eax     # next->pagetable
+        
+        cmpl %ebx, %eax         # if(next->pagtable != __current->pagetable) {
+        jz 1f
+        movl %eax, %cr3         #   cpu_lcr3(next->pagetable)
+                                # }
+    1:
+        movl %ecx, __current    # __current = next
+
+        test %edx, %edx         # do we have signal to handle?
+        jz 1f
+        movl %edx, %eax
+        jmp handle_signal
+    1:
+        leal 8(%ecx), %eax
+        jmp soft_iret
+
+    .global handle_signal
+    handle_signal:
+        # 注意1：任何对proc_sig的布局改动，都须及时的保证这里的一致性！
+        # 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 %eax              # esp
+        pushl 64(%ebx)          # proc_sig->prev_context.eflags
+        pushl $UCODE_SEG        # cs
+        pushl $sig_wrapper      # eip for sig wrapper
+
+        movw $UDATA_SEG, %cx    # switch data seg to user mode
+        movw %cx, %es
+        movw %cx, %ds
+        movw %cx, %fs
+        movw %cx, %gs
+
+        iret  
+
+    sig_wrapper:                # in user mode
+        movl %esp, %eax
+        and $0xfffffff0, %esp
+        subl $8, %esp
+        pushl %eax              # Addr to proc_sig structure 
+        pushl 4(%eax)           # proc_sig->sig_num     ---- 16 bytes aligned
+
+        call (%eax)             # invoke signal handler
+
+        # invoke the sigreturn syscall to exit the signal wrapper
+        movl $__SYSCALL_sigreturn, %eax
+        movl 4(%esp), %ebx
+        int $LUNAIX_SYS_CALL    
+
+        ud2                     # never reach!
\ No newline at end of file