afa8862328
a heavily stripped down FreeBSD/i386 (brutally stripped down actually) to attempt to get a stable base to start from. There is a lot missing still. Worth noting: - The kernel runs at 1GB in order to cheat with the pmap code. pmap uses a variation of the PAE code in order to avoid having to worry about 4 levels of page tables yet. - It boots in 64 bit "long mode" with a tiny trampoline embedded in the i386 loader. This simplifies locore.s greatly. - There are still quite a few fragments of i386-specific code that have not been translated yet, and some that I cheated and wrote dumb C versions of (bcopy etc). - It has both int 0x80 for syscalls (but using registers for argument passing, as is native on the amd64 ABI), and the 'syscall' instruction for syscalls. int 0x80 preserves all registers, 'syscall' does not. - I have tried to minimize looking at the NetBSD code, except in a couple of places (eg: to find which register they use to replace the trashed %rcx register in the syscall instruction). As a result, there is not a lot of similarity. I did look at NetBSD a few times while debugging to get some ideas about what I might have done wrong in my first attempt.
94 lines
3.1 KiB
C
94 lines
3.1 KiB
C
/*
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* Mach Operating System
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* Copyright (c) 1991,1990 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie Mellon
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* the rights to redistribute these changes.
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*
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* $FreeBSD$
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*/
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#ifndef _MACHINE_DB_MACHDEP_H_
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#define _MACHINE_DB_MACHDEP_H_
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#include <machine/frame.h>
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#include <machine/psl.h>
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#include <machine/trap.h>
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#define i386_saved_state trapframe
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typedef vm_offset_t db_addr_t; /* address - unsigned */
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typedef long db_expr_t; /* expression - signed */
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typedef struct i386_saved_state db_regs_t;
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extern db_regs_t ddb_regs; /* register state */
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#define DDB_REGS (&ddb_regs)
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#define PC_REGS(regs) ((db_addr_t)(regs)->tf_rip)
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#define BKPT_INST 0xcc /* breakpoint instruction */
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#define BKPT_SIZE (1) /* size of breakpoint inst */
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#define BKPT_SET(inst) (BKPT_INST)
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#define BKPT_SKIP ddb_regs.tf_eip += 1
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#define FIXUP_PC_AFTER_BREAK ddb_regs.tf_eip -= 1;
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#define db_clear_single_step(regs) ((regs)->tf_eflags &= ~PSL_T)
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#define db_set_single_step(regs) ((regs)->tf_eflags |= PSL_T)
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#define IS_BREAKPOINT_TRAP(type, code) ((type) == T_BPTFLT)
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/*
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* Watchpoints are not supported. The debug exception type is in %dr6
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* and not yet in the args to this macro.
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*/
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#define IS_WATCHPOINT_TRAP(type, code) 0
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#define I_CALL 0xe8
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#define I_CALLI 0xff
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#define I_RET 0xc3
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#define I_IRET 0xcf
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#define inst_trap_return(ins) (((ins)&0xff) == I_IRET)
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#define inst_return(ins) (((ins)&0xff) == I_RET)
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#define inst_call(ins) (((ins)&0xff) == I_CALL || \
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(((ins)&0xff) == I_CALLI && \
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((ins)&0x3800) == 0x1000))
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#define inst_load(ins) 0
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#define inst_store(ins) 0
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/*
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* There no interesting addresses below _kstack = 0xefbfe000. There
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* are small absolute values for GUPROF, but we don't want to see them.
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* Treat "negative" addresses below _kstack as non-small to allow for
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* future reductions of _kstack and to avoid sign extension problems.
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*
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* There is one interesting symbol above -db_maxoff = 0xffff0000,
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* namely _APTD = 0xfffff000. Accepting this would mess up the
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* printing of small negative offsets. The next largest symbol is
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* _APTmap = 0xffc00000. Accepting this is OK (unless db_maxoff is
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* set to >= 0x400000 - (max stack offset)).
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*/
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#define DB_SMALL_VALUE_MAX 0x7fffffff
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#define DB_SMALL_VALUE_MIN (-0x400001)
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#endif /* !_MACHINE_DB_MACHDEP_H_ */
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