50860ac0ee
the register values coming back from sigreturn(2). Normally this wouldn't matter because the 32 bit environment would truncate the upper 32 bits and re-save the truncated values at the next trap. However, if we got a fast second signal and it was pending while we were returning from sigreturn(2) in the signal trampoline, we'd never have had a chance to truncate the bogus values in 32 bit mode, and the new sendsig would get an EFAULT when trying to write to the bogus user stack address.
209 lines
5.9 KiB
C
209 lines
5.9 KiB
C
/*-
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* Copyright (c) 1999 Marcel Moolenaar
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* Copyright (c) 2003 Peter Wemm
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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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* in this position and unchanged.
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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. The name of the author 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 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.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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struct ia32_sigaltstack {
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u_int32_t ss_sp; /* signal stack base */
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u_int32_t ss_size; /* signal stack length */
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int ss_flags; /* SS_DISABLE and/or SS_ONSTACK */
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};
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struct ia32_mcontext {
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u_int32_t mc_onstack; /* XXX - sigcontext compat. */
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u_int32_t mc_gs; /* machine state (struct trapframe) */
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u_int32_t mc_fs;
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u_int32_t mc_es;
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u_int32_t mc_ds;
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u_int32_t mc_edi;
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u_int32_t mc_esi;
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u_int32_t mc_ebp;
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u_int32_t mc_isp;
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u_int32_t mc_ebx;
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u_int32_t mc_edx;
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u_int32_t mc_ecx;
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u_int32_t mc_eax;
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u_int32_t mc_trapno;
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u_int32_t mc_err;
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u_int32_t mc_eip;
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u_int32_t mc_cs;
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u_int32_t mc_eflags;
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u_int32_t mc_esp;
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u_int32_t mc_ss;
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u_int32_t mc_len; /* sizeof(struct ia32_mcontext) */
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/* We use the same values for fpformat and ownedfp */
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u_int32_t mc_fpformat;
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u_int32_t mc_ownedfp;
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u_int32_t mc_spare1[1]; /* align next field to 16 bytes */
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/*
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* See <i386/include/npx.h> for the internals of mc_fpstate[].
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*/
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u_int32_t mc_fpstate[128] __aligned(16);
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u_int32_t mc_spare2[8];
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};
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struct ia32_ucontext {
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sigset_t uc_sigmask;
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struct ia32_mcontext uc_mcontext;
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u_int32_t uc_link;
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struct ia32_sigaltstack uc_stack;
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u_int32_t uc_flags;
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u_int32_t __spare__[4];
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};
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#if defined(COMPAT_FREEBSD4)
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struct ia32_mcontext4 {
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u_int32_t mc_onstack; /* XXX - sigcontext compat. */
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u_int32_t mc_gs; /* machine state (struct trapframe) */
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u_int32_t mc_fs;
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u_int32_t mc_es;
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u_int32_t mc_ds;
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u_int32_t mc_edi;
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u_int32_t mc_esi;
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u_int32_t mc_ebp;
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u_int32_t mc_isp;
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u_int32_t mc_ebx;
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u_int32_t mc_edx;
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u_int32_t mc_ecx;
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u_int32_t mc_eax;
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u_int32_t mc_trapno;
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u_int32_t mc_err;
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u_int32_t mc_eip;
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u_int32_t mc_cs;
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u_int32_t mc_eflags;
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u_int32_t mc_esp;
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u_int32_t mc_ss;
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u_int32_t mc_fpregs[28];
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u_int32_t __spare__[17];
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};
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struct ia32_ucontext4 {
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sigset_t uc_sigmask;
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struct ia32_mcontext4 uc_mcontext;
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u_int32_t uc_link;
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struct ia32_sigaltstack uc_stack;
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u_int32_t __spare__[8];
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};
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#endif
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#ifdef COMPAT_FREEBSD3
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struct ia32_sigcontext3 {
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u_int32_t sc_onstack;
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u_int32_t sc_mask;
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u_int32_t sc_esp;
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u_int32_t sc_ebp;
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u_int32_t sc_isp;
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u_int32_t sc_eip;
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u_int32_t sc_eflags;
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u_int32_t sc_es;
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u_int32_t sc_ds;
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u_int32_t sc_cs;
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u_int32_t sc_ss;
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u_int32_t sc_edi;
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u_int32_t sc_esi;
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u_int32_t sc_ebx;
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u_int32_t sc_edx;
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u_int32_t sc_ecx;
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u_int32_t sc_eax;
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u_int32_t sc_gs;
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u_int32_t sc_fs;
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u_int32_t sc_trapno;
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u_int32_t sc_err;
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};
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#endif
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/*
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* Signal frames, arguments passed to application signal handlers.
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*/
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union ia32_sigval {
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int sigval_int;
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u_int32_t sigval_ptr;
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};
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struct ia32_siginfo {
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int si_signo; /* signal number */
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int si_errno; /* errno association */
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int si_code; /* signal code */
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int32_t si_pid; /* sending process */
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u_int32_t si_uid; /* sender's ruid */
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int si_status; /* exit value */
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u_int32_t si_addr; /* faulting instruction */
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union ia32_sigval si_value; /* signal value */
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int32_t si_band; /* band event for SIGPOLL */
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int __spare__[7]; /* gimme some slack */
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};
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#ifdef COMPAT_FREEBSD4
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struct ia32_sigframe4 {
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u_int32_t sf_signum;
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u_int32_t sf_siginfo; /* code or pointer to sf_si */
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u_int32_t sf_ucontext; /* points to sf_uc */
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u_int32_t sf_addr; /* undocumented 4th arg */
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u_int32_t sf_ah; /* action/handler pointer */
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struct ia32_ucontext4 sf_uc; /* = *sf_ucontext */
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struct ia32_siginfo sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
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};
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#endif
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struct ia32_sigframe {
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u_int32_t sf_signum;
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u_int32_t sf_siginfo; /* code or pointer to sf_si */
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u_int32_t sf_ucontext; /* points to sf_uc */
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u_int32_t sf_addr; /* undocumented 4th arg */
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u_int32_t sf_ah; /* action/handler pointer */
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/* Beware, hole due to ucontext being 16 byte aligned! */
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struct ia32_ucontext sf_uc; /* = *sf_ucontext */
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struct ia32_siginfo sf_si; /* = *sf_siginfo (SA_SIGINFO case) */
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};
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#ifdef COMPAT_FREEBSD3
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struct ia32_siginfo3 {
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struct ia32_sigcontext3 si_sc;
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int si_signo;
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int si_code;
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union ia32_sigval si_value;
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};
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struct ia32_sigframe3 {
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int sf_signum;
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u_int32_t sf_arg2; /* int or siginfo_t */
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u_int32_t sf_scp;
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u_int32_t sf_addr;
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u_int32_t sf_ah; /* action/handler pointer */
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struct ia32_siginfo3 sf_siginfo;
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};
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#endif
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extern char ia32_sigcode[];
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extern char freebsd4_ia32_sigcode[];
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extern int sz_ia32_sigcode;
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extern int sz_freebsd4_ia32_sigcode;
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extern void ia32_sendsig(sig_t, int, sigset_t *, u_long);
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extern void ia32_setregs(struct thread *td, u_long entry, u_long stack,
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u_long ps_strings);
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