X-Git-Url: https://scm.lunaixsky.com/lunaix-os.git/blobdiff_plain/8c6f505faaa66e18cdca108dca549d4ad806a077..b91be0033265b5b6bd716bd39cb0971da41906c4:/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 deleted file mode 100644 index 23df5b5..0000000 --- a/lunaix-os/kernel/asm/x86/interrupt.S +++ /dev/null @@ -1,252 +0,0 @@ -#define __ASM__ -#include -#include -#include -#define __ASM_INTR_DIAGNOSIS - -#ifdef __ASM_INTR_DIAGNOSIS -.section .bss - .global debug_resv - debug_resv: - .skip 16 - tmp_store: - .skip 4 -#endif - -.section .bss - .align 16 - lo_tmp_stack: - .skip 128 - tmp_stack: - -/* - This perhaps the ugliest part in the project. - It contains code to handle arbitrary depth of - nested interrupt and all those corner cases and - nasty gotchas. - - Be aware the twists, offsets and hidden dependencies! - -*/ - -.section .text - .global interrupt_wrapper - interrupt_wrapper: - /* - Stack layout (layout of struct isr_param) - msa: [ss] > 76 - [esp] > 72 - eflags > 68 - cs > 64 - eip > 60 - err_code > 56 - vector > offset = 52 - [saved_prev_ctx] > offset = 0 - --- - esp - gs - fs - es - ds > offset = 7 * 4 = 28 + 4 - esi - ebp - edi - edx - ecx - ebx - eax - lsa: depth > offset = 0 - - las: Least Significant Address - msa: Most Significant Address - */ - cld - - subl $52, %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 %edx - pushl %ecx - pushl %ebx - pushl %eax - - movl __current, %eax - movl 8(%eax), %eax - incl %eax - pushl %eax # nested intr: current depth - - movl 116(%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 68(%eax), %ebx - fxsave (%ebx) - - movl 124(%esp), %ebx # 取出esp - movl %ebx, 60(%eax) # 存入__current->ustack_top - - 1: - movl %esp, %eax - andl $0xfffffff0, %esp - subl $16, %esp - movl %eax, (%esp) - - call intr_handler - - movl (%esp), %eax - - .global soft_iret - soft_iret: - movl %eax, %esp - -#ifdef __ASM_INTR_DIAGNOSIS - movl %eax, (debug_resv + 8) - movl 48(%esp), %eax - movl 60(%eax), %eax - movl %eax, (debug_resv + 4) # eip -#endif - movl __current, %eax - movl 68(%eax), %eax - - test %eax, %eax # do we have stored x87 context? - jz 1f - fxrstor (%eax) -1: - popl %eax # discard isr_param::depth - popl %eax - popl %ebx - popl %ecx - popl %edx - popl %edi - popl %ebp - popl %esi - - movw (%esp), %ds - movw 4(%esp), %es - movw 8(%esp), %fs - movw 12(%esp), %gs - - movl 16(%esp), %esp - - movl %eax, tmp_store - movl __current, %eax - # nested intr: restore saved context - popl 8(%eax) # depth - popl 12(%eax) # eax - popl 16(%eax) # ebx - popl 20(%eax) # ecx - popl 24(%eax) # edx - popl 28(%eax) # edi - popl 32(%eax) # ebp - popl 36(%eax) # esi - popl 40(%eax) # ds - popl 44(%eax) # es - popl 48(%eax) # fs - popl 52(%eax) # gs - popl 56(%eax) # esp - - addl $8, %esp - -#ifdef __ASM_INTR_DIAGNOSIS - movl (%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 4(%esp), %eax - andl $3, %eax - setnz %al - shll $3, %eax - addl $12, %eax - addl %esp, %eax - movl %eax, (_tss + 4) - movl tmp_store, %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 64(%eax), %ecx # __current->pagetable - movl 64(%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 - movl 48(%ebx), %ebx - pushl 68(%ebx) # proc_sig->prev_context.proc_regs.execp->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