feat: (vm) memory mapping support: mmap/munmap

[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 9d392734efbbd7e7f640e01c7611984ce193e447..2961f3b7d89f50a8f01677abbf1d452bc972b323 100644 (file)
--- a/lunaix-os/kernel/asm/x86/interrupt.S
+++ b/lunaix-os/kernel/asm/x86/interrupt.S
@@ -1,26 +1,59 @@
 #define __ASM__
 #include <arch/x86/interrupts.h>
 #define __ASM__
 #include <arch/x86/interrupts.h>

+#include <lunaix/common.h>
+#include <lunaix/syscall.h>
+#define __ASM_INTR_DIAGNOSIS

 
 

-.macro isr_template vector, no_error_code=1
-    .global _asm_isr\vector
-    .type _asm_isr\vector, @function
-    _asm_isr\vector:
-        .if \no_error_code
-            pushl $0x0
-        .endif
-        pushl $\vector
-        jmp interrupt_wrapper
-.endm
+#ifdef __ASM_INTR_DIAGNOSIS
+.section .bss
+    .global debug_resv
+    debug_resv:
+        .skip 16
+#endif

 
 

-.section .text
-    isr_template FAULT_DIVISION_ERROR
-    isr_template FAULT_GENERAL_PROTECTION, no_error_code=0
-    isr_template FAULT_PAGE_FAULT, no_error_code=0
-
-    isr_template LUNAIX_SYS_PANIC
+.section .bss
+    .align 16
+    lo_tmp_stack:
+        .skip 128
+    tmp_stack:

 
 

+.section .text
+    .global interrupt_wrapper

     interrupt_wrapper:
     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
         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
         pushl %esi
         pushl %ebp
         pushl %edi


@@ -29,15 +62,53 @@
         pushl %ebx
         pushl %eax
 
         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
+
+        # 保存x87FPU的状态
+        movl 92(%eax), %ebx
+        fxsave (%ebx)
+
+        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
         movl %eax, (%esp)
 
         movl %esp, %eax
         andl $0xfffffff0, %esp
         subl $16, %esp
         movl %eax, (%esp)
 

-        call interrupt_handler
-        popl %eax
+        call intr_handler
+
+        movl (%esp), %eax
+
+    .global soft_iret
+    soft_iret:

         movl %eax, %esp
 
         movl %eax, %esp
 

+#ifdef __ASM_INTR_DIAGNOSIS
+        movl %eax, (debug_resv + 8)
+        movl 56(%esp), %eax
+        movl %eax, (debug_resv + 4)
+#endif
+        movl (__current), %eax
+        movl 92(%eax), %eax
+        
+        test %eax, %eax     # do we have stored x87 context?
+        jz 1f 
+        fxrstor (%eax)      
+1:

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


@@ -45,8 +116,96 @@
         popl %edi
         popl %ebp
         popl %esi
         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
 
 
         addl $8, %esp
 

-        iret
\ No newline at end of file
+        pushl %eax
+#ifdef __ASM_INTR_DIAGNOSIS
+        movl 4(%esp), %eax
+        movl %eax, debug_resv
+#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
+        # arg1: 目标进程PCB地址 (next
+
+        popl %ebx               # next
+        movl __current, %eax    
+        movl 88(%eax), %ecx     # __current->pagetable
+        movl 88(%ebx), %eax     # next->pagetable
+        
+        cmpl %ecx, %eax         # if(next->pagtable != __current->pagetable) {
+        jz 1f
+        movl %eax, %cr3         #   cpu_lcr3(next->pagetable)
+                                # }
+    1:
+        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 %eax, %eax         # do we have signal to handle?
+        jz 1f
+        jmp handle_signal
+    1:
+        leal 8(%ebx), %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 $UDATA_SEG        # proc_sig->prev_context.proc_regs.ss
+        pushl %eax              # esp
+        pushl 64(%ebx)          # proc_sig->prev_context.proc_regs.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  
+
+.section .usrtext
+    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