d85631c4ac
stolen from the ia64/ia32 code (indeed there was a repocopy), but I've redone the MD parts and added and fixed a few essential syscalls. It is sufficient to run i386 binaries like /bin/ls, /usr/bin/id (dynamic) and p4. The ia64 code has not implemented signal delivery, so I had to do that. Before you say it, yes, this does need to go in a common place. But we're in a freeze at the moment and I didn't want to risk breaking ia64. I will sort this out after the freeze so that the common code is in a common place. On the AMD64 side, this required adding segment selector context switch support and some other support infrastructure. The %fs/%gs etc code is hairy because loading %gs will clobber the kernel's current MSR_GSBASE setting. The segment selectors are not used by the kernel, so they're only changed at context switch time or when changing modes. This still needs to be optimized. Approved by: re (amd64/* blanket)
165 lines
4.8 KiB
C
165 lines
4.8 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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/* XXX should be 640 bytes long; check and see if __packed is needed */
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struct ia32_mcontext {
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int mc_onstack; /* XXX - sigcontext compat. */
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int mc_gs; /* machine state (struct trapframe) */
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int mc_fs;
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int mc_es;
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int mc_ds;
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int mc_edi;
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int mc_esi;
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int mc_ebp;
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int mc_isp;
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int mc_ebx;
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int mc_edx;
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int mc_ecx;
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int mc_eax;
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int mc_trapno;
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int mc_err;
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int mc_eip;
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int mc_cs;
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int mc_eflags;
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int mc_esp;
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int mc_ss;
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int mc_len; /* sizeof(struct ia32_mcontext) */
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/* We use the same values for fpformat and ownedfp */
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int mc_fpformat;
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int mc_ownedfp;
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int mc_spare1[1]; /* align next field to 16 bytes */
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/*
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* See <machine/npx.h> for the internals of mc_fpstate[].
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*/
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int mc_fpstate[128] __aligned(16);
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int mc_spare2[8];
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};
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/* XXX should be 704 bytes long; check and see if __packed is needed */
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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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int uc_flags;
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int __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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int mc_onstack; /* XXX - sigcontext compat. */
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int mc_gs; /* machine state (struct trapframe) */
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int mc_fs;
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int mc_es;
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int mc_ds;
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int mc_edi;
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int mc_esi;
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int mc_ebp;
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int mc_isp;
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int mc_ebx;
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int mc_edx;
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int mc_ecx;
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int mc_eax;
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int mc_trapno;
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int mc_err;
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int mc_eip;
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int mc_cs;
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int mc_eflags;
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int mc_esp;
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int mc_ss;
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int mc_fpregs[28];
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int __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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int __spare__[8];
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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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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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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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