diff options
Diffstat (limited to 'i386/pc/rv86/rv86_trap_handler.S')
| -rw-r--r-- | i386/pc/rv86/rv86_trap_handler.S | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/i386/pc/rv86/rv86_trap_handler.S b/i386/pc/rv86/rv86_trap_handler.S deleted file mode 100644 index 793f6b6..0000000 --- a/i386/pc/rv86/rv86_trap_handler.S +++ /dev/null @@ -1,167 +0,0 @@ -/* - * Copyright (c) 1995-1994 The University of Utah and - * the Computer Systems Laboratory at the University of Utah (CSL). - * All rights reserved. - * - * Permission to use, copy, modify and distribute this software is hereby - * granted provided that (1) source code retains these copyright, permission, - * and disclaimer notices, and (2) redistributions including binaries - * reproduce the notices in supporting documentation, and (3) all advertising - * materials mentioning features or use of this software display the following - * acknowledgement: ``This product includes software developed by the - * Computer Systems Laboratory at the University of Utah.'' - * - * THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS - * IS" CONDITION. THE UNIVERSITY OF UTAH AND CSL DISCLAIM ANY LIABILITY OF - * ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. - * - * CSL requests users of this software to return to csl-dist@cs.utah.edu any - * improvements that they make and grant CSL redistribution rights. - * - * Author: Bryan Ford, University of Utah CSL - */ - -#include <mach/machine/asm.h> -#include <mach/machine/eflags.h> - -#include "i386_asm.h" -#include "trap.h" -#include "trap_asm.h" - - .text - -ENTRY(rv86_trap_handler) - cmpl $T_GENERAL_PROTECTION,TR_TRAPNO(%esp) - jz gpf_from_v86 - - UNEXPECTED_TRAP - -gpf_from_v86: - - /* Load the linear/physical-address data segment, - for easy access to real-mode memory. */ - movl $LINEAR_DS,%eax - movw %ax,%ds - - /* Find the physical address of the trapping instruction (ebx). */ - movzwl TR_CS(%esp),%ebx - shll $4,%ebx - addl TR_EIP(%esp),%ebx - - /* See if we're just trying to get out of v86 mode. */ - cmpl %ss:EXT(rv86_return_int_pa),%ebx - je EXT(rv86_return) - - /* Check the instruction (al). */ - movb (%ebx),%al - cmpb $0xcd,%al - je gpf_int_n - - UNEXPECTED_TRAP - - -gpf_int_n: - - /* Bump the ip past the int instruction. */ - addw $2,TR_EIP(%esp) - - /* Find the real mode interrupt vector number (esi). */ - movzbl 1(%ebx),%esi - - /* See if it's a copy-extended-memory interrupt request; - if so, just handle it here. */ - cmpl $0x15,%esi - jne 1f - cmpb $0x87,TR_EAX+1(%esp) - je copy_ext_mem -1: - - /* XXX The stuff down here is essentially the same as in moss. */ - -reflect_v86_intr: - - /* Find the address of the real mode interrupt vector (esi). */ - shll $2,%esi - - /* Make room for the real-mode interrupt stack frame. */ - subw $6,TR_ESP(%esp) - - /* Find the physical address of the v86 stack (ebx). */ - movzwl TR_SS(%esp),%ebx - shll $4,%ebx - addl TR_ESP(%esp),%ebx - - /* Store the return information into the v86 stack frame. */ - movl TR_EIP(%esp),%eax - movw %ax,(%ebx) - movl TR_CS(%esp),%eax - movw %ax,2(%ebx) - movl TR_EFLAGS(%esp),%eax - movw %ax,4(%ebx) - - /* Find the real-mode interrupt vector to invoke, - and set up the real_call_thread's kernel stack frame - to point to it. */ - movl (%esi),%eax - movw %ax,TR_EIP(%esp) - shrl $16,%eax - movw %ax,TR_CS(%esp) - andl $-1-EFL_IF-EFL_TF,TR_EFLAGS(%esp) - - /* Restore saved state and return. */ - addl $4*4,%esp - popa - addl $4*2,%esp - iret - - - -/* We intercepted a copy-extended-memory software interrupt - (int 0x15 function 0x87). - This is used by HIMEM.SYS, for example, to manage extended memory. - The BIOS's routine isn't going to work in v86 mode, - so do it ourselves. */ -copy_ext_mem: - - /* Find the parameter block provided by the caller (ebx). */ - movzwl TR_V86_ES(%esp),%ebx - movzwl TR_ESI(%esp),%eax - shll $4,%ebx - addl %eax,%ebx - - /* Source address (esi). */ - movl 0x12(%ebx),%esi - andl $0x00ffffff,%esi - - /* Destination address (edi). */ - movl 0x1a(%ebx),%edi - andl $0x00ffffff,%edi - - /* Number of bytes (ecx). */ - movzwl TR_ECX(%esp),%ecx - addl %ecx,%ecx - - /* Use the standard i386 bcopy routine to copy the data. - This assumes it's "friendly" in its use of segment registers - (i.e. always uses ss for stack data and ds/es for the data to copy). - The bcopy is simple enough that this should always be true. */ - movw %ds,%ax - movw %ax,%es - cld - pushl %ecx - pushl %edi - pushl %esi - call EXT(bcopy) - addl $3*4,%esp - - /* Clear the carry flag to indicate that the copy was successful. - AH is also cleared, below. */ - andl $-1-EFL_CF,TR_EFLAGS(%esp) - - /* Restore saved state and return. */ - addl $4*4,%esp - popa - xorb %ah,%ah - addl $4*2,%esp - iret - |