panaLiX: Plik źródłowy src/arch/x86/except.s

00001 /***********************************************************
00002 *PANALIX 0.06, (c) Adrian Panasiuk 2002,3                  *
00003 *adek336[at]o2.pl, panalix.prv.pl                          *
00004 *under GPLv3 license                                       *
00005 *                                                          *
00006 *panalix - small osdev project                             *
00007 ************************************************************
00008 *       except.s, version 2.0                              *
00009 *                                                          *
00010 ************************************************************
00011 *                                                          *
00012 *interrupt wrappers                                        *
00013 *                                                          *
00014 *26'07'04- ain't working that well, probably there are     *
00015 *   fatal bugs in this (old version) very file.            *
00016 *30'04'04- forked from panalix 0.05 branch except.s(1.2)   *
00017 *                                                          *
00018 ***********************************************************/
00019 
00020 
00021 .globl free_stacks_ptr
00022 .globl free_stacks
00023 .globl intr_body
00024 .globl sysentry
00025 
00026 .macro macro_push_context
00027 /*push on stack all regs*/
00028         pusha
00029         push %ds
00030         push %es
00031         push %fs
00032         push %gs
00033 .endm
00034 
00035 .extern pr
00036 .macro macro_pop_context
00037 /*pop regs from stack*/
00038         pop %gs
00039         pop %fs
00040         pop %es
00041         pop %ds
00042         popa
00043 .endm
00044 
00045 .macro macro_setup_segms
00046 /*setups kernel-level selectors*/
00047         movw $0x10, %ax
00048         movw %ax, %ds
00049         movw %ax, %ss
00050         movw %ax, %es
00051         movw %ax, %fs
00052         movw %ax, %gs
00053 .endm
00054 
00055 .macro intr code
00056 /*exceptions which do not save an error number on stack, and irqs*/
00057 .globl intr\code
00058 intr\code:
00059         pushl $0
00060         pushl $\code            /*save error number*/
00061         jmp intr_body           /*continue*/
00062 .endm
00063 
00064 .macro intr_err code
00065 /*exceptions which cast an error number on stack*/
00066 .globl intr\code
00067 intr\code:
00068         pushl $\code
00069         jmp intr_body
00070 .endm
00071 
00072 
00073 /*caution: adding more pushs may break the system because of the stack copying in chain2()*/
00074 /* this one is the way user apps call the system API. Why wouldn't we use the existing asm-stubs if they worked? */
00075 sysentry:
00076 /* this will fool chain2() that we are from an interrupt, and chain2() will save those values. */
00077         pushl $0x23     /* ss */
00078         pushl %ecx      /* esp */
00079         pushf           /* eflags */
00080         pushl $0x1b     /* cs */
00081         pushl %edx      /* eip */
00082 /*CHAINHANDLERSTACKCOPY*/
00083         pushf           /* eflags will be in code.c2; QUICKHACK */
00084         pushl $0x30
00085 
00086 
00087         macro_push_context              /*CHAINREGCOPY*/
00088         macro_setup_segms
00089 
00090         pushl %ebp
00091         movl %esp, %ebp
00092         call *exc
00093         popl %ebp
00094 
00095         macro_pop_context
00096         add $0x4, %esp  /* code.c1 */
00097         popf
00098 /* now get off stack the pseudo-iret-frame */
00099         add $0x14, %esp
00100 
00101         sti
00102         sysexit /* yea:) of course the user app remembered to put return %eip into %edx and %esp into %ecx.*/
00103 
00104 
00105 /* INTERRUPT WRAPPER BODY (stage1 :-) stage2 is in except_c.c) */
00106 intr_body:
00107         macro_push_context
00108         macro_setup_segms
00109 
00110         pushl %ebp
00111         movl %esp, %ebp
00112         call *exc
00113         popl %ebp
00114 
00115         macro_pop_context
00116         add $8, %esp    /* code.c1, code.c2 */
00117 
00118         iret
00119 
00120 
00121 
00122 /*exception handlers*/
00123 intr 0x00
00124 intr 0x01
00125 intr 0x02
00126 intr 0x03
00127 intr 0x04
00128 intr 0x05
00129 intr 0x06
00130 intr 0x07
00131 /* intr_err 0x08; double fault-not handled here, but by double_fault()*/
00132 intr 0x09
00133 intr_err 0x0a
00134 intr_err 0x0b
00135 /*intr_err 0x0c; stack fault- not handled here, but at double_fault()*/
00136 intr_err 0x0d
00137 intr_err 0x0e
00138 /*.globl intr0x0e
00139 intr0x0e:
00140    popl %eax
00141    popl %ebx
00142    popl %ecx
00143    popl %edx
00144    cli
00145    hlt
00146    pushl $0x0e
00147    jmp intr_body*/
00148 intr_err 0x0f
00149 intr 0x10
00150 intr_err 0x11
00151 intr 0x12
00152 intr 0x13
00153 intr 0x14
00154 intr 0x15
00155 intr 0x16
00156 intr 0x17
00157 intr 0x18
00158 intr 0x19
00159 intr 0x1a
00160 intr 0x1b
00161 intr 0x1c
00162 intr 0x1d
00163 intr 0x1e
00164 intr 0x1f
00165 
00166 /*irq handlers*/
00167 intr 0x20
00168 intr 0x21
00169 intr 0x22
00170 intr 0x23
00171 intr 0x24
00172 intr 0x25
00173 intr 0x26
00174 intr 0x27
00175 intr 0x28
00176 intr 0x29
00177 intr 0x2a
00178 intr 0x2b
00179 intr 0x2c
00180 intr 0x2d
00181 intr 0x2e
00182 intr 0x2f
00183 
00184 /*****************************************************
00185 *
00186 *panalix 0.04 (c) Adrian Panasiuk 2003
00187 *adek336[at]o2.pl, panalix.prv.pl
00188 *
00189 *****************************************************/