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001 /* Copyright (C) 2005 David Decotigny 001 /* Copyright (C) 2005 David Decotigny 002 Copyright (C) 2004 The KOS Team 002 Copyright (C) 2004 The KOS Team 003 003 004 This program is free software; you can redi 004 This program is free software; you can redistribute it and/or 005 modify it under the terms of the GNU Genera 005 modify it under the terms of the GNU General Public License 006 as published by the Free Software Foundatio 006 as published by the Free Software Foundation; either version 2 007 of the License, or (at your option) any lat 007 of the License, or (at your option) any later version. 008 008 009 This program is distributed in the hope tha 009 This program is distributed in the hope that it will be useful, 010 but WITHOUT ANY WARRANTY; without even the 010 but WITHOUT ANY WARRANTY; without even the implied warranty of 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR 011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 012 GNU General Public License for more details 012 GNU General Public License for more details. 013 013 014 You should have received a copy of the GNU 014 You should have received a copy of the GNU General Public License 015 along with this program; if not, write to t 015 along with this program; if not, write to the Free Software 016 Foundation, Inc., 59 Temple Place - Suite 3 016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 017 USA. 017 USA. 018 */ 018 */ 019 #include "segment.h" 019 #include "segment.h" 020 020 021 021 022 /** 022 /** 023 * @file swintr_wrappers.S 023 * @file swintr_wrappers.S 024 * 024 * 025 * The SOS low-level handlers for the software 025 * The SOS low-level handlers for the software interrupts. Currently 026 * only 1 wrapper: that for the SOS syscalls. 026 * only 1 wrapper: that for the SOS syscalls. 027 */ 027 */ 028 .file "swintr_wrappers.S" 028 .file "swintr_wrappers.S" 029 029 030 .text 030 .text 031 031 032 /* The address of the real "C" syscall functio 032 /* The address of the real "C" syscall function */ 033 .extern sos_do_syscall 033 .extern sos_do_syscall 034 034 035 /** Update the kernel TSS in case we are switc 035 /** Update the kernel TSS in case we are switching to a thread in user 036 mode in order to come back into the co 036 mode in order to come back into the correct kernel stack */ 037 .extern sos_cpu_context_update_kernel_tss 037 .extern sos_cpu_context_update_kernel_tss 038 038 039 /* The address of the function to call to set 039 /* The address of the function to call to set back the user thread's 040 MMU configuration upon return to user conte 040 MMU configuration upon return to user context */ 041 .extern sos_thread_prepare_syscall_switch_back 041 .extern sos_thread_prepare_syscall_switch_back 042 042 043 .p2align 2, 0x90 043 .p2align 2, 0x90 044 .globl sos_syscall_wrapper 044 .globl sos_syscall_wrapper 045 sos_syscall_wrapper: 045 sos_syscall_wrapper: 046 .type sos_syscall_wrapper,@function 046 .type sos_syscall_wrapper,@function 047 047 048 /* Fake error code */ 048 /* Fake error code */ 049 pushl $0 049 pushl $0 050 /* Backup the context */ 050 /* Backup the context */ 051 pushl %ebp 051 pushl %ebp 052 movl %esp, %ebp 052 movl %esp, %ebp 053 053 054 pushl %edi 054 pushl %edi 055 pushl %esi 055 pushl %esi 056 pushl %edx 056 pushl %edx 057 pushl %ecx 057 pushl %ecx 058 pushl %ebx 058 pushl %ebx 059 pushl %eax 059 pushl %eax 060 subl $2,%esp 060 subl $2,%esp 061 pushw %ss 061 pushw %ss 062 pushw %ds 062 pushw %ds 063 pushw %es 063 pushw %es 064 pushw %fs 064 pushw %fs 065 pushw %gs 065 pushw %gs 066 066 067 /* Set correct kernel segment descriptors' v 067 /* Set correct kernel segment descriptors' value */ 068 movw $SOS_BUILD_SEGMENT_REG_VALUE(0, 0, SOS_ 068 movw $SOS_BUILD_SEGMENT_REG_VALUE(0, 0, SOS_SEG_KDATA), %di 069 pushw %di ; popw %ds 069 pushw %di ; popw %ds 070 pushw %di ; popw %es 070 pushw %di ; popw %es 071 pushw %di ; popw %fs 071 pushw %di ; popw %fs 072 pushw %di ; popw %gs 072 pushw %di ; popw %gs 073 073 074 /* Prepare the call to do_syscall */ 074 /* Prepare the call to do_syscall */ 075 pushl %esp /* user_ctxt */ 075 pushl %esp /* user_ctxt */ 076 pushl %eax /* syscall ID */ 076 pushl %eax /* syscall ID */ 077 077 078 call sos_do_syscall 078 call sos_do_syscall 079 /* Unallocate the stack used by the 079 /* Unallocate the stack used by the 080 do_syscall arguments */ 080 do_syscall arguments */ 081 addl $8, %esp 081 addl $8, %esp 082 082 083 /* store the do_syscall return value into in 083 /* store the do_syscall return value into interrupted context */ 084 movl %eax, 12(%esp) 084 movl %eax, 12(%esp) 085 085 086 /* Set the MMU configuration to that of the 086 /* Set the MMU configuration to that of the user thread's process */ 087 pushl %esp /* user_ctxt */ 087 pushl %esp /* user_ctxt */ 088 call sos_thread_prepare_syscall_switch_back 088 call sos_thread_prepare_syscall_switch_back 089 addl $4, %esp /* Unallocate the stack */ 089 addl $4, %esp /* Unallocate the stack */ 090 090 091 /* Prepare kernel TSS because we are switchi 091 /* Prepare kernel TSS because we are switching back to a user 092 thread: we make sure that we will come ba 092 thread: we make sure that we will come back into the kernel at a 093 correct stack location */ 093 correct stack location */ 094 pushl %esp /* Pass the location of the conte 094 pushl %esp /* Pass the location of the context we are 095 restoring to the function */ 095 restoring to the function */ 096 call sos_cpu_context_update_kernel_tss 096 call sos_cpu_context_update_kernel_tss 097 addl $4, %esp 097 addl $4, %esp 098 098 099 /* Restore the user context */ 099 /* Restore the user context */ 100 popw %gs 100 popw %gs 101 popw %fs 101 popw %fs 102 popw %es 102 popw %es 103 popw %ds 103 popw %ds 104 popw %ss 104 popw %ss 105 addl $2,%esp 105 addl $2,%esp 106 popl %eax /* This is the return value of do 106 popl %eax /* This is the return value of do_syscall (see above) */ 107 popl %ebx 107 popl %ebx 108 popl %ecx 108 popl %ecx 109 popl %edx 109 popl %edx 110 popl %esi 110 popl %esi 111 popl %edi 111 popl %edi 112 112 113 popl %ebp 113 popl %ebp 114 /* Remove fake error code */ 114 /* Remove fake error code */ 115 addl $4, %esp 115 addl $4, %esp 116 iret 116 iret
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