f00519b613
a leftover from the days when a low-level debugger had hooks in the undefined exception vector and needed stack space to function. These days it effectively isn't used because we switch immediately to the svc32 mode stack on exception entry. For that, the single undef mode stack per core that gets set up at init time works fine. The stack wasn't necessary but it was harmful, because the space for it was carved out of the normal per-thread svc32 stack, in effect cutting that 8K stack in half. If svc32 mode used more than 4k of stack space it wandered down into the undef mode stack, and then an undef exception would overwrite a couple words on the stack while switching to svc32 mode, corrupting the scv32 stack. Having another stack abut the bottom of the svc32 stack also effectively mooted the guard page below the stack. This work is based on analysis and patches submitted by Juergen Weiss.
143 lines
5.4 KiB
C
143 lines
5.4 KiB
C
/*-
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* Copyright (c) 2004 Olivier Houchard
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/assym.h>
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#include <sys/proc.h>
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#include <sys/mbuf.h>
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#include <sys/vmmeter.h>
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#include <sys/bus.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include <vm/vm_map.h>
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#include <machine/vmparam.h>
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#include <machine/armreg.h>
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#include <machine/frame.h>
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#include <machine/pcb.h>
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#include <machine/cpu.h>
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#include <machine/proc.h>
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#include <machine/cpufunc.h>
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#include <machine/pte.h>
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#include <machine/intr.h>
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#include <machine/sysarch.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/ip_var.h>
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ASSYM(KERNBASE, KERNBASE);
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ASSYM(PCB_NOALIGNFLT, PCB_NOALIGNFLT);
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ASSYM(PCB_ONFAULT, offsetof(struct pcb, pcb_onfault));
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ASSYM(PCB_DACR, offsetof(struct pcb, pcb_dacr));
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ASSYM(PCB_FLAGS, offsetof(struct pcb, pcb_flags));
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ASSYM(PCB_PAGEDIR, offsetof(struct pcb, pcb_pagedir));
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ASSYM(PCB_L1VEC, offsetof(struct pcb, pcb_l1vec));
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ASSYM(PCB_PL1VEC, offsetof(struct pcb, pcb_pl1vec));
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ASSYM(PCB_R8, offsetof(struct pcb, un_32.pcb32_r8));
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ASSYM(PCB_R9, offsetof(struct pcb, un_32.pcb32_r9));
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ASSYM(PCB_R10, offsetof(struct pcb, un_32.pcb32_r10));
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ASSYM(PCB_R11, offsetof(struct pcb, un_32.pcb32_r11));
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ASSYM(PCB_R12, offsetof(struct pcb, un_32.pcb32_r12));
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ASSYM(PCB_PC, offsetof(struct pcb, un_32.pcb32_pc));
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ASSYM(PCB_SP, offsetof(struct pcb, un_32.pcb32_sp));
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ASSYM(PC_CURPCB, offsetof(struct pcpu, pc_curpcb));
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ASSYM(PC_CURTHREAD, offsetof(struct pcpu, pc_curthread));
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ASSYM(M_LEN, offsetof(struct mbuf, m_len));
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ASSYM(M_DATA, offsetof(struct mbuf, m_data));
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ASSYM(M_NEXT, offsetof(struct mbuf, m_next));
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ASSYM(IP_SRC, offsetof(struct ip, ip_src));
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ASSYM(IP_DST, offsetof(struct ip, ip_dst));
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ASSYM(CF_SETTTB, offsetof(struct cpu_functions, cf_setttb));
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ASSYM(CF_CONTROL, offsetof(struct cpu_functions, cf_control));
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ASSYM(CF_CONTEXT_SWITCH, offsetof(struct cpu_functions, cf_context_switch));
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ASSYM(CF_DCACHE_WB_RANGE, offsetof(struct cpu_functions, cf_dcache_wb_range));
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ASSYM(CF_L2CACHE_WB_RANGE, offsetof(struct cpu_functions, cf_l2cache_wb_range));
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ASSYM(CF_IDCACHE_WBINV_ALL, offsetof(struct cpu_functions, cf_idcache_wbinv_all));
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ASSYM(CF_L2CACHE_WBINV_ALL, offsetof(struct cpu_functions, cf_l2cache_wbinv_all));
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ASSYM(CF_TLB_FLUSHID_SE, offsetof(struct cpu_functions, cf_tlb_flushID_SE));
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ASSYM(CF_ICACHE_SYNC, offsetof(struct cpu_functions, cf_icache_sync_all));
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ASSYM(V_TRAP, offsetof(struct vmmeter, v_trap));
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ASSYM(V_SOFT, offsetof(struct vmmeter, v_soft));
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ASSYM(V_INTR, offsetof(struct vmmeter, v_intr));
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ASSYM(TD_PCB, offsetof(struct thread, td_pcb));
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ASSYM(TD_FLAGS, offsetof(struct thread, td_flags));
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ASSYM(TD_PROC, offsetof(struct thread, td_proc));
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ASSYM(TD_FRAME, offsetof(struct thread, td_frame));
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ASSYM(TD_MD, offsetof(struct thread, td_md));
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ASSYM(TD_LOCK, offsetof(struct thread, td_lock));
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ASSYM(MD_TP, offsetof(struct mdthread, md_tp));
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ASSYM(MD_RAS_START, offsetof(struct mdthread, md_ras_start));
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ASSYM(MD_RAS_END, offsetof(struct mdthread, md_ras_end));
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ASSYM(TF_R0, offsetof(struct trapframe, tf_r0));
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ASSYM(TF_R1, offsetof(struct trapframe, tf_r1));
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ASSYM(TF_PC, offsetof(struct trapframe, tf_pc));
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ASSYM(P_PID, offsetof(struct proc, p_pid));
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ASSYM(P_FLAG, offsetof(struct proc, p_flag));
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ASSYM(SIGF_UC, offsetof(struct sigframe, sf_uc));
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#ifdef ARM_TP_ADDRESS
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ASSYM(ARM_TP_ADDRESS, ARM_TP_ADDRESS);
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ASSYM(ARM_RAS_START, ARM_RAS_START);
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ASSYM(ARM_RAS_END, ARM_RAS_END);
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#endif
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#ifdef VFP
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ASSYM(PCB_VFPSTATE, offsetof(struct pcb, pcb_vfpstate));
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ASSYM(PC_CPU, offsetof(struct pcpu, pc_cpu));
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ASSYM(PC_CURPMAP, offsetof(struct pcpu, pc_curpmap));
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#endif
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ASSYM(PAGE_SIZE, PAGE_SIZE);
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ASSYM(PDESIZE, PDESIZE);
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ASSYM(PMAP_DOMAIN_KERNEL, PMAP_DOMAIN_KERNEL);
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#ifdef PMAP_INCLUDE_PTE_SYNC
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ASSYM(PMAP_INCLUDE_PTE_SYNC, 1);
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#endif
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ASSYM(TDF_ASTPENDING, TDF_ASTPENDING);
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ASSYM(TDF_NEEDRESCHED, TDF_NEEDRESCHED);
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ASSYM(P_TRACED, P_TRACED);
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ASSYM(P_SIGEVENT, P_SIGEVENT);
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ASSYM(P_PROFIL, P_PROFIL);
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ASSYM(TRAPFRAMESIZE, sizeof(struct trapframe));
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ASSYM(MAXCOMLEN, MAXCOMLEN);
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ASSYM(NIRQ, NIRQ);
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ASSYM(PCPU_SIZE, sizeof(struct pcpu));
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