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prime objectives are: o Implement a syscall path based on the epc inststruction (see sys/ia64/ia64/syscall.s). o Revisit the places were we need to save and restore registers and define those contexts in terms of the register sets (see sys/ia64/include/_regset.h). Secundairy objectives: o Remove the requirement to use contigmalloc for kernel stacks. o Better handling of the high FP registers for SMP systems. o Switch to the new cpu_switch() and cpu_throw() semantics. o Add a good unwinder to reconstruct contexts for the rare cases we need to (see sys/contrib/ia64/libuwx) Many files are affected by this change. Functionally it boils down to: o The EPC syscall doesn't preserve registers it does not need to preserve and places the arguments differently on the stack. This affects libc and truss. o The address of the kernel page directory (kptdir) had to be unstaticized for use by the nested TLB fault handler. The name has been changed to ia64_kptdir to avoid conflicts. The renaming affects libkvm. o The trapframe only contains the special registers and the scratch registers. For syscalls using the EPC syscall path no scratch registers are saved. This affects all places where the trapframe is accessed. Most notably the unaligned access handler, the signal delivery code and the debugger. o Context switching only partly saves the special registers and the preserved registers. This affects cpu_switch() and triggered the move to the new semantics, which additionally affects cpu_throw(). o The high FP registers are either in the PCB or on some CPU. context switching for them is done lazily. This affects trap(). o The mcontext has room for all registers, but not all of them have to be defined in all cases. This mostly affects signal delivery code now. The *context syscalls are as of yet still unimplemented. Many details went into the removal of the requirement to use contigmalloc for kernel stacks. The details are mostly CPU specific and limited to exception_save() and exception_restore(). The few places where we create, destroy or switch stacks were mostly simplified by not having to construct physical addresses and additionally saving the virtual addresses for later use. Besides more efficient context saving and restoring, which of course yields a noticable speedup, this also fixes the dreaded SMP bootup problem as a side-effect. The details of which are still not fully understood. This change includes all the necessary backward compatibility code to have it handle older userland binaries that use the break instruction for syscalls. Support for break-based syscalls has been pessimized in favor of a clean implementation. Due to the overall better performance of the kernel, this will still be notived as an improvement if it's noticed at all. Approved by: re@ (jhb)
115 lines
3.4 KiB
C
115 lines
3.4 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: db_machdep.h,v 1.6 1997/09/06 02:02:25 thorpej Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its 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
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* FOR 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 the
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* rights to redistribute these changes.
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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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/*
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* Machine-dependent defines for new kernel debugger.
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*/
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#include <sys/param.h>
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#include <vm/vm.h>
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#include <machine/frame.h>
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#include <machine/ia64_cpu.h>
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#define DB_NO_AOUT
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struct ia64_bundle;
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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 trapframe 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_special.iip + \
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(((regs)->tf_special.psr >> 41) & 3))
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#define BKPT_WRITE(addr, storage) db_write_breakpoint(addr, storage)
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#define BKPT_CLEAR(addr, storage) db_clear_breakpoint(addr, storage)
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#define BKPT_INST_TYPE u_int64_t
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#define BKPT_SKIP db_skip_breakpoint()
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#define db_clear_single_step(regs) ddb_regs.tf_special.psr &= ~IA64_PSR_SS
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#define db_set_single_step(regs) ddb_regs.tf_special.psr |= IA64_PSR_SS
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#define IS_BREAKPOINT_TRAP(type, code) (type == IA64_VEC_BREAK)
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#define IS_WATCHPOINT_TRAP(type, code) 0
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#define inst_trap_return(ins) (ins & 0)
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#define inst_return(ins) (ins & 0)
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#define inst_call(ins) (ins & 0)
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#define inst_branch(ins) (ins & 0)
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#define inst_load(ins) (ins & 0)
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#define inst_store(ins) (ins & 0)
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#define inst_unconditional_flow_transfer(ins) (ins & 0)
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#define branch_taken(ins, pc, regs) pc
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/*
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* Functions needed for software single-stepping.
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*/
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/* No delay slots on Alpha. */
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#define next_instr_address(v, b) ((db_addr_t) ((b) ? (v) : ((v) + 4)))
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u_long db_register_value(db_regs_t *, int);
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int kdb_trap(int vector, struct trapframe *regs);
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u_int64_t *db_rse_current_frame(void);
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u_int64_t *db_rse_previous_frame(u_int64_t *bsp, int sof);
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u_int64_t *db_rse_register_address(u_int64_t *bsp, int regno);
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void db_read_bundle(db_addr_t addr, struct ia64_bundle *bp);
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void db_write_bundle(db_addr_t addr, struct ia64_bundle *bp);
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void db_write_breakpoint(db_addr_t addr, u_int64_t *storage);
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void db_clear_breakpoint(db_addr_t addr, u_int64_t *storage);
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void db_skip_breakpoint(void);
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/*
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* Pretty arbitrary
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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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/*
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* We define some of our own commands.
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*/
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#define DB_MACHINE_COMMANDS
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/*
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* We use Elf64 symbols in DDB.
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*/
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#define DB_ELFSIZE 64
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#endif /* _MACHINE_DB_MACHDEP_H_ */
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