91078fca0c
-----------------------------
By introducing a new sigframe so that the signal handler operates
on the new siginfo_t and on ucontext_t instead of sigcontext, we
now need two version of sendsig and sigreturn.
A flag in struct proc determines whether the process expects an
old sigframe or a new sigframe. The signal trampoline handles
which sigreturn to call. It does this by testing for a magic
cookie in the frame.
The alpha uses osigreturn to implement longjmp. This means that
osigreturn is not only used for compatibility with existing
binaries. To handle the new sigset_t, setjmp saves it in
sc_reserved (see NOTE).
the struct sigframe has been moved from frame.h to sigframe.h
to handle the complex header dependencies that was caused by
the new sigframe.
NOTE: For the i386, the size of jmp_buf has been increased to hold
the new sigset_t. On the alpha this has been prevented by
using sc_reserved in sigcontext.
92 lines
3.1 KiB
C
92 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/trap.h>
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#include <machine/psl.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 int 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_eip)
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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 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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