d98eb707b0
In r356767, memcpy/memmove/bcopy optimizations were added to libc to improve performance. This exposed an existing kernel issue in VSX handling. The PSL_VSX flag was not being excluded from the psl_userstatic set, which meant that any thread that used these and then called swapcontext(3) would get an EINVAL error. Fixing this exposed a second issue - in r344123, the FPU was being forced off in set_mcontext(). However, this was neglecting to ensure VSX was turned off at the same time. While here, add some code comments to explain what's going on. Reviewed by: jhibbits, luporl (earlier rev), pkubaj (earlier rev) Sponsored by: Tag1 Consulting, Inc. Differential Revision: https://reviews.freebsd.org/D23497
474 lines
14 KiB
C
474 lines
14 KiB
C
/*-
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* Copyright (C) 2006-2012 Semihalf
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Copyright (C) 2001 Benno Rice
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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 Benno Rice ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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* $NetBSD: machdep.c,v 1.74.2.1 2000/11/01 16:13:48 tv Exp $
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*/
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/*-
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* Copyright (C) 1995, 1996 Wolfgang Solfrank.
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* Copyright (C) 1995, 1996 TooLs GmbH.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by TooLs GmbH.
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* 4. The name of TooLs GmbH may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_ddb.h"
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#include "opt_hwpmc_hooks.h"
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#include "opt_kstack_pages.h"
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#include "opt_platform.h"
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <sys/time.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/bus.h>
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#include <sys/cons.h>
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#include <sys/cpu.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/rwlock.h>
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#include <sys/sysctl.h>
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#include <sys/exec.h>
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#include <sys/ktr.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysproto.h>
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#include <sys/signalvar.h>
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#include <sys/sysent.h>
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#include <sys/imgact.h>
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#include <sys/msgbuf.h>
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#include <sys/ptrace.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_page.h>
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#include <vm/vm_object.h>
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#include <vm/vm_pager.h>
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#include <machine/cpu.h>
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#include <machine/kdb.h>
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#include <machine/reg.h>
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#include <machine/vmparam.h>
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#include <machine/spr.h>
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#include <machine/hid.h>
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#include <machine/psl.h>
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#include <machine/trap.h>
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#include <machine/md_var.h>
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#include <machine/mmuvar.h>
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#include <machine/sigframe.h>
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#include <machine/machdep.h>
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#include <machine/metadata.h>
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#include <machine/platform.h>
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#include <sys/linker.h>
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#include <sys/reboot.h>
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#include <contrib/libfdt/libfdt.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#ifdef DDB
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#include <ddb/ddb.h>
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#endif
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#ifdef DEBUG
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#define debugf(fmt, args...) printf(fmt, ##args)
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#else
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#define debugf(fmt, args...)
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#endif
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extern unsigned char _etext[];
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extern unsigned char _edata[];
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extern unsigned char __bss_start[];
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extern unsigned char __sbss_start[];
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extern unsigned char __sbss_end[];
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extern unsigned char _end[];
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extern vm_offset_t __endkernel;
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extern vm_paddr_t kernload;
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/*
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* Bootinfo is passed to us by legacy loaders. Save the address of the
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* structure to handle backward compatibility.
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*/
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uint32_t *bootinfo;
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void print_kernel_section_addr(void);
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void print_kenv(void);
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uintptr_t booke_init(u_long, u_long);
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void ivor_setup(void);
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extern void *interrupt_vector_base;
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extern void *int_critical_input;
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extern void *int_machine_check;
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extern void *int_data_storage;
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extern void *int_instr_storage;
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extern void *int_external_input;
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extern void *int_alignment;
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extern void *int_fpu;
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extern void *int_program;
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extern void *int_syscall;
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extern void *int_decrementer;
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extern void *int_fixed_interval_timer;
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extern void *int_watchdog;
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extern void *int_data_tlb_error;
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extern void *int_inst_tlb_error;
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extern void *int_debug;
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extern void *int_debug_ed;
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extern void *int_vec;
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extern void *int_vecast;
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#ifdef __SPE__
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extern void *int_spe_fpdata;
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extern void *int_spe_fpround;
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#endif
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#ifdef HWPMC_HOOKS
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extern void *int_performance_counter;
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#endif
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#define SET_TRAP(ivor, handler) \
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KASSERT(((uintptr_t)(&handler) & ~0xffffUL) == \
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((uintptr_t)(&interrupt_vector_base) & ~0xffffUL), \
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("Handler " #handler " too far from interrupt vector base")); \
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mtspr(ivor, (uintptr_t)(&handler) & 0xffffUL);
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uintptr_t powerpc_init(vm_offset_t fdt, vm_offset_t, vm_offset_t, void *mdp,
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uint32_t mdp_cookie);
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void booke_cpu_init(void);
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void
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booke_cpu_init(void)
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{
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cpu_features |= PPC_FEATURE_BOOKE;
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psl_kernset = PSL_CE | PSL_ME | PSL_EE;
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#ifdef __powerpc64__
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psl_kernset |= PSL_CM;
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#endif
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psl_userset = psl_kernset | PSL_PR;
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#ifdef __powerpc64__
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psl_userset32 = psl_userset & ~PSL_CM;
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#endif
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/*
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* Zeroed bits in this variable signify that the value of the bit
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* in its position is allowed to vary between userspace contexts.
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*
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* All other bits are required to be identical for every userspace
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* context. The actual *value* of the bit is determined by
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* psl_userset and/or psl_userset32, and is not allowed to change.
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*
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* Remember to update this set when implementing support for
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* *conditionally* enabling a processor facility. Failing to do
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* this will cause swapcontext() in userspace to break when a
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* process uses a conditionally-enabled facility.
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*
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* When *unconditionally* implementing support for a processor
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* facility, update psl_userset / psl_userset32 instead.
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*
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* See the access control check in set_mcontext().
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*/
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psl_userstatic = ~(PSL_VEC | PSL_FP | PSL_FE0 | PSL_FE1);
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pmap_mmu_install(MMU_TYPE_BOOKE, BUS_PROBE_GENERIC);
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}
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void
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ivor_setup(void)
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{
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mtspr(SPR_IVPR, ((uintptr_t)&interrupt_vector_base) & ~0xffffUL);
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SET_TRAP(SPR_IVOR0, int_critical_input);
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SET_TRAP(SPR_IVOR1, int_machine_check);
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SET_TRAP(SPR_IVOR2, int_data_storage);
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SET_TRAP(SPR_IVOR3, int_instr_storage);
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SET_TRAP(SPR_IVOR4, int_external_input);
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SET_TRAP(SPR_IVOR5, int_alignment);
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SET_TRAP(SPR_IVOR6, int_program);
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SET_TRAP(SPR_IVOR8, int_syscall);
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SET_TRAP(SPR_IVOR10, int_decrementer);
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SET_TRAP(SPR_IVOR11, int_fixed_interval_timer);
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SET_TRAP(SPR_IVOR12, int_watchdog);
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SET_TRAP(SPR_IVOR13, int_data_tlb_error);
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SET_TRAP(SPR_IVOR14, int_inst_tlb_error);
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SET_TRAP(SPR_IVOR15, int_debug);
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#ifdef HWPMC_HOOKS
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SET_TRAP(SPR_IVOR35, int_performance_counter);
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#endif
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switch ((mfpvr() >> 16) & 0xffff) {
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case FSL_E6500:
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SET_TRAP(SPR_IVOR32, int_vec);
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SET_TRAP(SPR_IVOR33, int_vecast);
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/* FALLTHROUGH */
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case FSL_E500mc:
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case FSL_E5500:
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SET_TRAP(SPR_IVOR7, int_fpu);
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SET_TRAP(SPR_IVOR15, int_debug_ed);
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break;
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case FSL_E500v1:
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case FSL_E500v2:
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SET_TRAP(SPR_IVOR32, int_vec);
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#ifdef __SPE__
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SET_TRAP(SPR_IVOR33, int_spe_fpdata);
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SET_TRAP(SPR_IVOR34, int_spe_fpround);
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#endif
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break;
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}
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#ifdef __powerpc64__
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/* Set 64-bit interrupt mode. */
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mtspr(SPR_EPCR, mfspr(SPR_EPCR) | EPCR_ICM);
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#endif
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}
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static int
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booke_check_for_fdt(uint32_t arg1, vm_offset_t *dtbp)
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{
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void *ptr;
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int fdt_size;
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if (arg1 % 8 != 0)
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return (-1);
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ptr = (void *)pmap_early_io_map(arg1, PAGE_SIZE);
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if (fdt_check_header(ptr) != 0)
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return (-1);
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/*
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* Read FDT total size from the header of FDT.
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* This for sure hits within first page which is
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* already mapped.
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*/
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fdt_size = fdt_totalsize((void *)ptr);
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/*
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* Ok, arg1 points to FDT, so we need to map it in.
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* First, unmap this page and then map FDT again with full size
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*/
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pmap_early_io_unmap((vm_offset_t)ptr, PAGE_SIZE);
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ptr = (void *)pmap_early_io_map(arg1, fdt_size);
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*dtbp = (vm_offset_t)ptr;
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return (0);
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}
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uintptr_t
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booke_init(u_long arg1, u_long arg2)
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{
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uintptr_t ret;
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void *mdp;
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vm_offset_t dtbp, end;
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end = (uintptr_t)_end;
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dtbp = (vm_offset_t)NULL;
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/* Set up TLB initially */
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bootinfo = NULL;
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bzero(__sbss_start, __sbss_end - __sbss_start);
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bzero(__bss_start, _end - __bss_start);
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tlb1_init();
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/*
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* Handle the various ways we can get loaded and started:
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* - FreeBSD's loader passes the pointer to the metadata
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* in arg1, with arg2 undefined. arg1 has a value that's
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* relative to the kernel's link address (i.e. larger
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* than 0xc0000000).
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* - Juniper's loader passes the metadata pointer in arg2
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* and sets arg1 to zero. This is to signal that the
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* loader maps the kernel and starts it at its link
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* address (unlike the FreeBSD loader).
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* - U-Boot passes the standard argc and argv parameters
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* in arg1 and arg2 (resp). arg1 is between 1 and some
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* relatively small number, such as 64K. arg2 is the
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* physical address of the argv vector.
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* - ePAPR loaders pass an FDT blob in r3 (arg1) and the magic hex
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* string 0x45504150 ('EPAP') in r6 (which has been lost by now).
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* r4 (arg2) is supposed to be set to zero, but is not always.
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*/
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if (arg1 == 0) /* Juniper loader */
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mdp = (void *)arg2;
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else if (booke_check_for_fdt(arg1, &dtbp) == 0) { /* ePAPR */
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end = roundup(end, 8);
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memmove((void *)end, (void *)dtbp, fdt_totalsize((void *)dtbp));
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dtbp = end;
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end += fdt_totalsize((void *)dtbp);
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__endkernel = end;
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mdp = NULL;
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} else if (arg1 > (uintptr_t)kernload) /* FreeBSD loader */
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mdp = (void *)arg1;
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else /* U-Boot */
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mdp = NULL;
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/* Default to 32 byte cache line size. */
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switch ((mfpvr()) >> 16) {
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case FSL_E500mc:
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case FSL_E5500:
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case FSL_E6500:
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cacheline_size = 64;
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break;
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}
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/*
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* Last element is a magic cookie that indicates that the metadata
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* pointer is meaningful.
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*/
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ret = powerpc_init(dtbp, 0, 0, mdp, (mdp == NULL) ? 0 : 0xfb5d104d);
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/* Enable caches */
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booke_enable_l1_cache();
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booke_enable_l2_cache();
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booke_enable_bpred();
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return (ret);
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}
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#define RES_GRANULE cacheline_size
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extern uintptr_t tlb0_miss_locks[];
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/* Initialise a struct pcpu. */
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void
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cpu_pcpu_init(struct pcpu *pcpu, int cpuid, size_t sz)
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{
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pcpu->pc_booke.tid_next = TID_MIN;
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#ifdef SMP
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uintptr_t *ptr;
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int words_per_gran = RES_GRANULE / sizeof(uintptr_t);
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ptr = &tlb0_miss_locks[cpuid * words_per_gran];
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pcpu->pc_booke.tlb_lock = ptr;
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*ptr = TLB_UNLOCKED;
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*(ptr + 1) = 0; /* recurse counter */
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#endif
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}
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/* Shutdown the CPU as much as possible. */
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void
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cpu_halt(void)
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{
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mtmsr(mfmsr() & ~(PSL_CE | PSL_EE | PSL_ME | PSL_DE));
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while (1)
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;
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}
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int
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ptrace_single_step(struct thread *td)
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{
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struct trapframe *tf;
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tf = td->td_frame;
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tf->srr1 |= PSL_DE;
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tf->cpu.booke.dbcr0 |= (DBCR0_IDM | DBCR0_IC);
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return (0);
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}
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int
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ptrace_clear_single_step(struct thread *td)
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{
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struct trapframe *tf;
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tf = td->td_frame;
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tf->srr1 &= ~PSL_DE;
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tf->cpu.booke.dbcr0 &= ~(DBCR0_IDM | DBCR0_IC);
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return (0);
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}
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void
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kdb_cpu_clear_singlestep(void)
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{
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register_t r;
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r = mfspr(SPR_DBCR0);
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mtspr(SPR_DBCR0, r & ~DBCR0_IC);
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kdb_frame->srr1 &= ~PSL_DE;
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}
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void
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kdb_cpu_set_singlestep(void)
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{
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register_t r;
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r = mfspr(SPR_DBCR0);
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mtspr(SPR_DBCR0, r | DBCR0_IC | DBCR0_IDM);
|
|
kdb_frame->srr1 |= PSL_DE;
|
|
}
|
|
|