📄 excalib.s
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/* excALib.s - exception handling I80x86 assembly routines *//* Copyright 1984-1995 Wind River Systems, Inc. */ .data .globl _copyright_wind_river .long _copyright_wind_river/*modification history--------------------01d,26sep95,hdn fixed a bug by incrementing _intCnt in excIntStub.01c,04jun93,hdn updated to 5.1 -overhauled -fixed #else and #endif -changed ASMLANGUAGE to _ASMLANGUAGE -changed copyright notice01b,13oct92,hdn debugged.01a,28feb92,hdn written based on TRON, 68k version.*//*DESCRIPTIONThis module contains the assembly language exception handling stub.It is connected directly to the 80x86 exception vectors.It sets up an appropriate environment and then calls a routinein excLib(1)..ne 26EXCEPTION STACK FRAME GROWTH.CS Exception/Trap Interrupt ----------------------- vector-number sp_5 ----------------------- ----------------------- vector-number sp_1(pointer to ESFn) sp_4 ----------------------- ----------------------- sp_1(pointer to ESFn) sp_2(pointer to REGS) sp_3 ----------------------- ----------------------- sp_2(pointer to REGS) errno sp_2 ----------------------- ----------------------- edi edi | | eax eax eflags eflags pc / return-address pc / return-address sp_1 ----------------------- ----------------------- EIP ERROR EIP 0x04 --------- --------- ----------------------- CS EIP CS 0x08 --------- --------- --------- EFLAGS CS EFLAGS 0x0c --------- --------- --------- EFLAGS 0x10 --------- ESF0 or ESF1 ESF0.CESEE ALSO: excLib(1)*/#define _ASMLANGUAGE#include "vxWorks.h" /* internal */ .globl _excCallTbl /* Call table */ .globl _excStub /* uninitialized exception handler */ .globl _excIntStub /* uninitialized interrupt handler */ .text .align 4/**************************************************************************** excCallTbl - table of Calls** NOMANUAL*/_excCallTbl: call _excStub /* 0 */ /* divide error */ call _excStub /* debug */ call _excStub /* non-maskable interrupt */ call _excStub /* breakpoint */ call _excStub /* overflow */ call _excStub /* bound */ call _excStub /* invalid opcode */ call _excStub /* device not available */ call _excStub /* double fault */ call _excStub /* co-processor overrun */ call _excStub /* invalid TSS */ call _excStub /* segment not present */ call _excStub /* stack fault */ call _excStub /* general protection fault */ call _excStub /* page fault */ call _excStub /* reserved */ call _excStub /* 10 */ /* co-processor error */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excStub /* unassigned reserved */ call _excIntStub /* 20 */ /* User Interrupts */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 30 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 40 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 50 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 60 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 70 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 80 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* 90 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* a0 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* b0 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* c0 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* d0 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* e0 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub /* f0 */ call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub call _excIntStub/*********************************************************************** excStub - exception handler** NOMANUAL*/ .align 4,0x90_excStub: pushfl /* save eflags */ pushal /* save regs */ movl %esp, %ebx /* save pointer to regs */ /* compute vector offset from return address to Call in table */ movl 0x24(%esp), %eax /* get Call return adrs */ subl $4, %eax /* adjust return adrs to be Call adrs */ subl $_excCallTbl, %eax /* get offset from start of Call table * (= vector offset) */ movl $5, %ecx /* turn vector offset into excep num */ cltd idivl %ecx /* %eax has exception num */ /* check whether the exception stack frame is ESF0 or ESF1 */ cmpl $8, %eax jl excStub1 /* vecNum < 8 , it is ESF0 */ cmpl $14, %eax jg excStub1 /* vecNum > 14 , it is ESF0 */ cmpl $9, %eax je excStub1 /* vecNum == 9 , it is ESF0 */ /* exception stack frame is ESF1 which has error-code */ movl 0x2c(%esp), %edx /* get pc from ESF */ movl %edx, 0x24(%esp) /* replace a return addr by the pc */ pushl %ebx /* push pointer to REG_SET */ addl $0x28, %ebx pushl %ebx /* push pointer to ESF */ pushl %eax /* push exception number */ call _excExcHandle addl $0xc, %esp /* clean up pushed arguments */ popal /* restore regs */ addl $0xc, %esp /* get pointer to ESF */ iret /* retry the instruction */ .align 4,0x90excStub1: /* exception stack frame is ESF0 */ movl 0x28(%esp), %edx /* get pc from ESF */ movl %edx, 0x24(%esp) /* replace a return addr by the pc */ pushl %ebx /* push pointer to REG_SET */ addl $0x28, %ebx pushl %ebx /* push pointer to ESF */ pushl %eax /* push exception number */ call _excExcHandle /* do exception processing */ addl $0xc, %esp /* clean up pushed arguments */ popal /* restore regs */ addl $0x8, %esp /* get pointer to ESF */ iret /* retry the instruction *//*********************************************************************** excIntStub - uninitialized interrupt handler** NOMANUAL*/ .align 4,0x90_excIntStub: incl _intCnt /* bump the counter */ pushfl /* save eflags */ pushal /* save regs */ movl %esp, %ebx /* save pointer to regs */ /* compute vector offset from return address to Call in table */ movl 0x24(%esp), %eax /* get Call return adrs */ subl $4, %eax /* adjust return adrs to be Call adrs */ subl $_excCallTbl, %eax /* get offset from start of Call table * (= vector offset) */ movl $5, %ecx /* turn vector offset into excep num */ cltd idivl %ecx /* %eax has exception num */ /* exception stack frame is ESF0 */ movl 0x28(%esp), %edx /* get pc from ESF */ movl %edx, 0x24(%esp) /* replace a return addr by the pc */ pushl _errno /* save errno on the stack (intEnt()) */ pushl %ebx /* push pointer to REG_SET */ addl $0x28, %ebx pushl %ebx /* push pointer to ESF */ pushl %eax /* push exception number */ call _excIntHandle /* do exception processing */ addl $0xc, %esp /* clean up pushed arguments */ popl _errno /* restore errno */ popal /* restore regs */ addl $0x8, %esp /* get pointer to ESF */ pushl _errno jmp _intExit⌨️ 快捷键说明
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