Add BTX startup/interface code.
This commit is contained in:
Robert Nordier
parent
49ee7af69e
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# $Id: Makefile,v 1.1.1.1 1998/09/12 04:29:22 rnordier Exp $
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# $Id: Makefile,v 1.2 1998/09/12 06:30:10 rnordier Exp $
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SUBDIR= btx btxldr
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SUBDIR= btx btxldr lib
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.include <bsd.subdir.mk>
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# $Id:$
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OBJS= btxcsu.o btxsys.o btxv86.o
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LDFLAGS+= -elf
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CLEANFILES+= crt0.o
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INTERNALLIB= true
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NOMAN= true
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NOPIC= true
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NOPROFILE= true
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all: crt0.o
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crt0.o: ${OBJS}
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${LD} ${LDFLAGS} -i -o ${.TARGET} ${OBJS}
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.include <bsd.lib.mk>
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#
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# Copyright (c) 1998 Robert Nordier
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms are freely
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# permitted provided that the above copyright notice and this
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# paragraph and the following disclaimer are duplicated in all
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# such forms.
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#
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# This software is provided "AS IS" and without any express or
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# implied warranties, including, without limitation, the implied
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# warranties of merchantability and fitness for a particular
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# purpose.
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#
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# $Id:$
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#
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# BTX C startup code (ELF).
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#
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#
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# Globals.
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#
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.global _start
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#
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# Constants.
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#
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.set ARGSIZ,0x60 # Size of arguments
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#
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# Client entry point.
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#
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_start: movl %eax,__base # Set base address
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subl $ARGSIZ,%esp # Set argument
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movl %esp,__args # pointer
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call main # Invoke client main()
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call exit # Invoke client exit()
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#
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# Data.
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#
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.comm __base,4 # Client base address
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.comm __args,4 # Client arguments
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#
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# Copyright (c) 1998 Robert Nordier
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms are freely
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# permitted provided that the above copyright notice and this
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# paragraph and the following disclaimer are duplicated in all
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# such forms.
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#
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# This software is provided "AS IS" and without any express or
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# implied warranties, including, without limitation, the implied
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# warranties of merchantability and fitness for a particular
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# purpose.
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#
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# $Id:$
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#
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# BTX system calls.
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#
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#
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# Globals.
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#
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.global __exit
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.global __exec
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#
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# Constants.
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#
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.set INT_SYS,0x30 # Interrupt number
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#
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# System call: exit
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#
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__exit: xorl %eax,%eax # BTX system
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int $INT_SYS # call 0x0
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#
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# System call: exec
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#
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__exec: movl $0x1,%eax # BTX system
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int $INT_SYS # call 0x1
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/*
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* Copyright (c) 1998 Robert Nordier
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are freely
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* permitted provided that the above copyright notice and this
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* paragraph and the following disclaimer are duplicated in all
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* such forms.
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*
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* This software is provided "AS IS" and without any express or
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* implied warranties, including, without limitation, the implied
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* warranties of merchantability and fitness for a particular
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* purpose.
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*/
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/*
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* $Id:$
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*/
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#ifndef _BTXV86_H_
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#define _BTXV86_H_
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#include <sys/types.h>
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#define V86_ADDR 0x10000 /* Segment:offset address */
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#define V86_CALLF 0x20000 /* Emulate far call */
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#define V86_FLAGS 0x40000 /* Return flags */
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struct __v86 {
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uint32_t ctl; /* Control flags */
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uint32_t addr; /* Interrupt number or address */
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uint32_t es; /* V86 ES register */
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uint32_t ds; /* V86 DS register */
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uint32_t fs; /* V86 FS register */
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uint32_t gs; /* V86 GS register */
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uint32_t eax; /* V86 EAX register */
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uint32_t ecx; /* V86 ECX register */
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uint32_t edx; /* V86 EDX register */
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uint32_t ebx; /* V86 EBX register */
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uint32_t efl; /* V86 eflags register */
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uint32_t ebp; /* V86 EBP register */
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uint32_t esi; /* V86 ESI register */
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uint32_t edi; /* V86 EDI register */
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};
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extern struct __v86 __v86; /* V86 interface structure */
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void __exit(int);
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void __exec(caddr_t, ...);
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void __v86int(void);
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#endif /* !_BTXV86_H_ */
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@ -0,0 +1,82 @@
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#
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# Copyright (c) 1998 Robert Nordier
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms are freely
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# permitted provided that the above copyright notice and this
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# paragraph and the following disclaimer are duplicated in all
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# such forms.
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#
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# This software is provided "AS IS" and without any express or
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# implied warranties, including, without limitation, the implied
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# warranties of merchantability and fitness for a particular
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# purpose.
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#
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# $Id:$
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#
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# BTX V86 interface.
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#
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#
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# Globals.
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#
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.global __v86int
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#
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# Fields in V86 interface structure.
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#
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.set V86_CTL,0x0 # Control flags
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.set V86_ADDR,0x4 # Int number/address
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.set V86_ES,0x8 # V86 ES
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.set V86_DS,0xc # V86 DS
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.set V86_FS,0x10 # V86 FS
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.set V86_GS,0x14 # V86 GS
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.set V86_EAX,0x18 # V86 EAX
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.set V86_ECX,0x1c # V86 ECX
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.set V86_EDX,0x20 # V86 EDX
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.set V86_EBX,0x24 # V86 EBX
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.set V86_EFL,0x28 # V86 eflags
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.set V86_EBP,0x2c # V86 EBP
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.set V86_ESI,0x30 # V86 ESI
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.set V86_EDI,0x34 # V86 EDI
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#
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# Other constants.
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#
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.set INT_V86,0x31 # Interrupt number
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.set SIZ_V86,0x38 # Size of V86 structure
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#
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# V86 interface function.
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#
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__v86int: pushl $__v86 # Push pointer
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call __v86_swap # Load V86 registers
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int $INT_V86 # To BTX
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call __v86_swap # Load user registers
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addl $0x4,%esp # Discard pointer
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ret # To user
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#
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# Swap V86 and user registers.
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#
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__v86_swap: xchgl %ebp,0x4(%esp,1) # Swap pointer, EBP
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xchgl %eax,V86_EAX(%ebp) # Swap EAX
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xchgl %ecx,V86_ECX(%ebp) # Swap ECX
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xchgl %edx,V86_EDX(%ebp) # Swap EDX
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xchgl %ebx,V86_EBX(%ebp) # Swap EBX
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pushl %eax # Save
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pushf # Put eflags
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popl %eax # in EAX
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xchgl %eax,V86_EFL(%ebp) # Swap
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pushl %eax # Put EAX
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popf # in eflags
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movl 0x8(%esp,1),%eax # Load EBP
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xchgl %eax,V86_EBP(%ebp) # Swap
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movl %eax,0x8(%esp,1) # Save EBP
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popl %eax # Restore
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xchgl %esi,V86_ESI(%ebp) # Swap ESI
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xchgl %edi,V86_EDI(%ebp) # Swap EDI
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xchgl %ebp,0x4(%esp,1) # Swap pointer, EBP
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ret # To caller
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#
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# V86 interface structure.
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#
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.comm __v86,SIZ_V86
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