66422f5b7a
under way to move the remnants of the a.out toolchain to ports. As the comment in src/Makefile said, this stuff is deprecated and one should not expect this to remain beyond 4.0-REL. It has already lasted WAY beyond that. Notable exceptions: gcc - I have not touched the a.out generation stuff there. ldd/ldconfig - still have some code to interface with a.out rtld. old as/ld/etc - I have not removed these yet, pending their move to ports. some includes - necessary for ldd/ldconfig for now. Tested on: i386 (extensively), alpha
161 lines
4.0 KiB
ArmAsm
161 lines
4.0 KiB
ArmAsm
/*-
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* Copyright (c) 1997 Jonathan Lemon
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* Functions for calling x86 BIOS functions from the BSD kernel
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*/
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#include <machine/asmacros.h>
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#include "assym.s"
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.data
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ALIGN_DATA
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bioscall_frame: .long 0
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bioscall_stack: .long 0
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.text
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/*
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* bios32(regs, offset, segment)
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* struct bios_regs *regs;
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* u_int offset;
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* u_short segment;
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*/
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ENTRY(bios32)
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pushl %ebp
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movl 16(%esp),%ebp
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mov %bp,bioscall_vector+4
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movl 12(%esp),%ebp
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movl %ebp,bioscall_vector
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movl 8(%esp),%ebp
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pushl %ebx
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pushl %esi
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pushl %edi
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movl 0(%ebp),%eax
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movl 4(%ebp),%ebx
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movl 8(%ebp),%ecx
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movl 12(%ebp),%edx
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movl 16(%ebp),%esi
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movl 20(%ebp),%edi
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pushl %ebp
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lcall *bioscall_vector
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popl %ebp
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movl %eax,0(%ebp)
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movl %ebx,4(%ebp)
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movl %ecx,8(%ebp)
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movl %edx,12(%ebp)
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movl %esi,16(%ebp)
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movl %edi,20(%ebp)
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movl $0,%eax /* presume success */
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jnc 1f
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movl $1,%eax /* nope */
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1:
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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ret
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/*
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* bios16_call(regs, stack)
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* struct bios_regs *regs;
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* char *stack;
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*/
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ENTRY(bios16_call)
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pushl %ebp
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movl %esp,%ebp
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addl $4,%ebp /* frame pointer */
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movl %ebp,bioscall_frame /* ... save it */
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pushl %ebx
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pushl %esi
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pushl %edi
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/*
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* the problem with a full 32-bit stack segment is that 16-bit code
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* tends to do a pushf, which only pushes %sp, not %esp. This value
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* is then popped off (into %esp) which causes a page fault because
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* it is the wrong address.
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*
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* the reverse problem happens for 16-bit stack addresses; the kernel
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* code attempts to get the address of something on the stack, and the
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* value returned is the address relative to %ss, not %ds.
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*
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* we fix this by installing a temporary stack at page 0, so the
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* addresses are always valid in both 32 bit and 16 bit modes.
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*/
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movl %esp,bioscall_stack /* save current stack location */
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movl 8(%ebp),%esp /* switch to page 0 stack */
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movl 4(%ebp),%ebp /* regs */
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movl 0(%ebp),%eax
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movl 4(%ebp),%ebx
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movl 8(%ebp),%ecx
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movl 12(%ebp),%edx
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movl 16(%ebp),%esi
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movl 20(%ebp),%edi
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pushl $BC32SEL
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leal CNAME(bios16_jmp),%ebp
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andl $PAGE_MASK,%ebp
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pushl %ebp /* reload %cs and */
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lret /* ...continue below */
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.globl CNAME(bios16_jmp)
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CNAME(bios16_jmp):
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lcallw *bioscall_vector /* 16-bit call */
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jc 1f
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pushl $0 /* success */
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jmp 2f
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1:
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pushl $1 /* failure */
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2:
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movl bioscall_frame,%ebp
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movl 4(%ebp),%ebp /* regs */
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movl %eax,0(%ebp)
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movl %ebx,4(%ebp)
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movl %ecx,8(%ebp)
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movl %edx,12(%ebp)
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movl %esi,16(%ebp)
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movl %edi,20(%ebp)
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popl %eax /* recover return value */
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movl bioscall_stack,%esp /* return to normal stack */
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popl %edi
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popl %esi
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popl %ebx
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popl %ebp
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movl (%esp),%ecx
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pushl %ecx /* return address */
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movl $KCSEL,4(%esp)
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lret /* reload %cs on the way out */
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