2 #include <arch/x86/interrupts.h>
3 #include <lunaix/common.h>
4 #include <lunaix/syscall.h>
5 #define __ASM_INTR_DIAGNOSIS
7 .macro isr_template vector, no_error_code=1
8 .global _asm_isr\vector
9 .type _asm_isr\vector, @function
18 #ifdef __ASM_INTR_DIAGNOSIS
32 isr_template FAULT_DIVISION_ERROR
33 isr_template FAULT_GENERAL_PROTECTION, no_error_code=0
34 isr_template FAULT_PAGE_FAULT, no_error_code=0
35 isr_template FAULT_STACK_SEG_FAULT, no_error_code=0
37 isr_template LUNAIX_SYS_PANIC
38 isr_template LUNAIX_SYS_CALL
40 isr_template APIC_ERROR_IV
41 isr_template APIC_LINT0_IV
42 isr_template APIC_TIMER_IV
43 isr_template APIC_SPIV_IV
44 isr_template RTC_TIMER_IV
46 isr_template PC_KBD_IV
47 isr_template AHCI_HBA_IV
51 Stack layout (layout of struct isr_param)
54 eflags > offset = 48 + 16 = 64
58 vector > offset = 28 + 16 + 4 = 48
63 ds > offset = 7 * 4 = 28
72 las: Least Significant Address
73 msa: Most Significant Address
92 movl 60(%esp), %eax /* 取出 %cs */
93 andl $0x3, %eax /* 判断 RPL */
96 movw $KDATA_SEG, %ax /* 如果从用户模式转来,则切换至内核数据段 */
102 # 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,
103 # 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
104 movl (__current), %eax
105 movl 68(%esp), %ebx # 取出esp
106 movl %ebx, 84(%eax) # 存入__current->ustack_top
110 andl $0xfffffff0, %esp
122 #ifdef __ASM_INTR_DIAGNOSIS
123 movl %eax, (debug_resv + 8)
125 movl %eax, (debug_resv + 4)
146 #ifdef __ASM_INTR_DIAGNOSIS
148 movl %eax, debug_resv
150 # 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)
151 # 那么TSS.ESP0应该为iret进行弹栈后,%esp的值。
152 # 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)
159 movl %eax, (_tss + 4)
166 # arg1: 目标进程PCB地址 (next
170 movl 88(%eax), %ecx # __current->pagetable
171 movl 88(%ebx), %eax # next->pagetable
173 cmpl %ecx, %eax # if(next->pagtable != __current->pagetable) {
175 movl %eax, %cr3 # cpu_lcr3(next->pagetable)
178 movl %ebx, __current # __current = next
180 # 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
182 movl $tmp_stack, %esp
183 call signal_dispatch # kernel/signal.c
185 test %eax, %eax # do we have signal to handle?
192 .global handle_signal
194 # 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!
195 # 注意2:handle_signal在调用之前,须确保proc_sig已经写入用户栈!
196 leal 8(%eax), %ebx # arg1 in %eax: addr of proc_sig structure in user stack
198 pushl $UDATA_SEG # proc_sig->prev_context.ss
200 pushl 64(%ebx) # proc_sig->prev_context.eflags
201 pushl $UCODE_SEG # cs
202 pushl $sig_wrapper # eip for sig wrapper
204 movw $UDATA_SEG, %cx # switch data seg to user mode
213 sig_wrapper: # in user mode
215 and $0xfffffff0, %esp
217 pushl %eax # Addr to proc_sig structure
218 pushl 4(%eax) # proc_sig->sig_num ---- 16 bytes aligned
220 call (%eax) # invoke signal handler
222 # invoke the sigreturn syscall to exit the signal wrapper
223 movl $__SYSCALL_sigreturn, %eax