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001 /* Copyright (C) 2005 David Decotigny !! 001 /* Copyright (C) 2000-2004, The KOS team 002 Copyright (C) 2000-2004, The KOS team !! 002 Copyright (C) 1999 Free Software Foundation, Inc. 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 #define ASM_SOURCE 1 019 #define ASM_SOURCE 1 020 << 021 020 022 .file "cpu_context_switch.S" 021 .file "cpu_context_switch.S" 023 022 024 .text 023 .text 025 024 026 025 027 .globl sos_cpu_context_switch !! 026 .globl sos_cpu_kstate_switch 028 .type sos_cpu_context_switch, @function !! 027 .type sos_cpu_kstate_switch, @function 029 sos_cpu_context_switch: !! 028 sos_cpu_kstate_switch: 030 // arg2= to_context -- esp+64 029 // arg2= to_context -- esp+64 031 // arg1= from_context -- esp+60 030 // arg1= from_context -- esp+60 032 // caller ip -- esp+56 031 // caller ip -- esp+56 033 pushf // (eflags) esp+52 032 pushf // (eflags) esp+52 034 pushl %cs // (cs) esp+48 033 pushl %cs // (cs) esp+48 035 pushl $resume_pc // (ip) esp+44 034 pushl $resume_pc // (ip) esp+44 036 pushl $0 // (error code) esp+40 035 pushl $0 // (error code) esp+40 037 pushl %ebp // esp+36 036 pushl %ebp // esp+36 038 pushl %edi // esp+32 037 pushl %edi // esp+32 039 pushl %esi // esp+28 038 pushl %esi // esp+28 040 pushl %edx // esp+24 039 pushl %edx // esp+24 041 pushl %ecx // esp+20 040 pushl %ecx // esp+20 042 pushl %ebx // esp+16 041 pushl %ebx // esp+16 043 pushl %eax // esp+12 042 pushl %eax // esp+12 044 subl $2, %esp // (alignment) esp+10 043 subl $2, %esp // (alignment) esp+10 045 pushw %ss // esp+8 044 pushw %ss // esp+8 046 pushw %ds // esp+6 045 pushw %ds // esp+6 047 pushw %es // esp+4 046 pushw %es // esp+4 048 pushw %fs // esp+2 047 pushw %fs // esp+2 049 pushw %gs // esp 048 pushw %gs // esp 050 049 051 /* 050 /* 052 * Now that the original eax/ebx are stored, !! 051 * Now that the original eax/ebx are store, we can use them safely 053 */ 052 */ 054 053 055 /* Store the address of the saved context */ 054 /* Store the address of the saved context */ 056 movl 60(%esp), %ebx 055 movl 60(%esp), %ebx 057 movl %esp, (%ebx) 056 movl %esp, (%ebx) 058 057 059 /* This is the proper context switch ! We ch 058 /* This is the proper context switch ! We change the stack here */ 060 movl 64(%esp), %esp 059 movl 64(%esp), %esp 061 060 062 /* Restore the CPU context */ 061 /* Restore the CPU context */ 063 popw %gs 062 popw %gs 064 popw %fs 063 popw %fs 065 popw %es 064 popw %es 066 popw %ds 065 popw %ds 067 popw %ss 066 popw %ss 068 addl $2,%esp 067 addl $2,%esp 069 popl %eax 068 popl %eax 070 popl %ebx 069 popl %ebx 071 popl %ecx 070 popl %ecx 072 popl %edx 071 popl %edx 073 popl %esi 072 popl %esi 074 popl %edi 073 popl %edi 075 popl %ebp 074 popl %ebp 076 addl $4, %esp /* Ignore "error code" */ 075 addl $4, %esp /* Ignore "error code" */ 077 076 078 /* This restores the eflags, the cs and the 077 /* This restores the eflags, the cs and the eip registers */ 079 iret /* equivalent to: popfl ; ret */ 078 iret /* equivalent to: popfl ; ret */ 080 079 081 resume_pc: 080 resume_pc: 082 // Same context as that when sos_cpu_c !! 081 // Same context as that when sos_cpu_kstate_switch got called 083 // arg2= to_context -- esp+8 082 // arg2= to_context -- esp+8 084 // arg1= from_context -- esp+4 083 // arg1= from_context -- esp+4 085 // caller ip -- esp 084 // caller ip -- esp 086 ret 085 ret 087 086 088 087 089 088 090 /* ------------------------- */ 089 /* ------------------------- */ 091 .globl sos_cpu_context_exit_to !! 090 .globl sos_cpu_kstate_exit_to 092 .type sos_cpu_context_exit_to, @function !! 091 .type sos_cpu_kstate_exit_to, @function 093 sos_cpu_context_exit_to: !! 092 sos_cpu_kstate_exit_to: 094 // arg3= reclaiming_arg -- esp+12 093 // arg3= reclaiming_arg -- esp+12 095 // arg2= reclaiming_func -- esp+8 094 // arg2= reclaiming_func -- esp+8 096 // arg1= to_context -- esp+4 095 // arg1= to_context -- esp+4 097 // caller ip -- esp 096 // caller ip -- esp 098 097 099 /* Store the current SP in a temporary regis 098 /* Store the current SP in a temporary register */ 100 movl %esp, %eax 099 movl %esp, %eax 101 100 102 /* This is the proper context switch ! We ch 101 /* This is the proper context switch ! We change the stack here */ 103 movl 4(%eax), %esp 102 movl 4(%eax), %esp 104 103 105 /* Call the reclaiming function (remember: t 104 /* Call the reclaiming function (remember: the old frame address 106 is stored in eax) */ 105 is stored in eax) */ 107 pushl 12(%eax) 106 pushl 12(%eax) 108 call *8(%eax) 107 call *8(%eax) 109 addl $4, %esp 108 addl $4, %esp 110 109 111 /* Restore the CPU context */ 110 /* Restore the CPU context */ 112 popw %gs 111 popw %gs 113 popw %fs 112 popw %fs 114 popw %es 113 popw %es 115 popw %ds 114 popw %ds 116 popw %ss 115 popw %ss 117 addl $2,%esp 116 addl $2,%esp 118 popl %eax 117 popl %eax 119 popl %ebx 118 popl %ebx 120 popl %ecx 119 popl %ecx 121 popl %edx 120 popl %edx 122 popl %esi 121 popl %esi 123 popl %edi 122 popl %edi 124 popl %ebp 123 popl %ebp 125 addl $4, %esp /* Ignore "error code" */ 124 addl $4, %esp /* Ignore "error code" */ 126 125 127 /* This restores the eflags, the cs and the 126 /* This restores the eflags, the cs and the eip registers */ 128 iret /* equivalent to: popfl ; ret */ 127 iret /* equivalent to: popfl ; ret */ >> 128
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