afe1a68827
Extend struct sysvec with three new elements: sv_fetch_syscall_args - the method to fetch syscall arguments from usermode into struct syscall_args. The structure is machine-depended (this might be reconsidered after all architectures are converted). sv_set_syscall_retval - the method to set a return value for usermode from the syscall. It is a generalization of cpu_set_syscall_retval(9) to allow ABIs to override the way to set a return value. sv_syscallnames - the table of syscall names. Use sv_set_syscall_retval in kern_sigsuspend() instead of hardcoding the call to cpu_set_syscall_retval(). The new functions syscallenter(9) and syscallret(9) are provided that use sv_*syscall* pointers and contain the common repeated code from the syscall() implementations for the architecture-specific syscall trap handlers. Syscallenter() fetches arguments, calls syscall implementation from ABI sysent table, and set up return frame. The end of syscall bookkeeping is done by syscallret(). Take advantage of single place for MI syscall handling code and implement ptrace_lwpinfo pl_flags PL_FLAG_SCE, PL_FLAG_SCX and PL_FLAG_EXEC. The SCE and SCX flags notify the debugger that the thread is stopped at syscall entry or return point respectively. The EXEC flag augments SCX and notifies debugger that the process address space was changed by one of exec(2)-family syscalls. The i386, amd64, sparc64, sun4v, powerpc and ia64 syscall()s are changed to use syscallenter()/syscallret(). MIPS and arm are not converted and use the mostly unchanged syscall() implementation. Reviewed by: jhb, marcel, marius, nwhitehorn, stas Tested by: marcel (ia64), marius (sparc64), nwhitehorn (powerpc), stas (mips) MFC after: 1 month
138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/*-
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* Copyright (c) 1995 Steven Wallace
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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 Steven Wallace.
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* 4. 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/exec.h>
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#include <sys/imgact.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/sysent.h>
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#include <sys/signalvar.h>
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#include <sys/proc.h>
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#include <sys/sx.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <i386/ibcs2/ibcs2_syscall.h>
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#include <i386/ibcs2/ibcs2_signal.h>
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MODULE_VERSION(ibcs2, 1);
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extern int bsd_to_ibcs2_errno[];
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extern struct sysent ibcs2_sysent[IBCS2_SYS_MAXSYSCALL];
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extern int szsigcode;
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extern char sigcode[];
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static int ibcs2_fixup(register_t **, struct image_params *);
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struct sysentvec ibcs2_svr3_sysvec = {
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.sv_size = sizeof (ibcs2_sysent) / sizeof (ibcs2_sysent[0]),
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.sv_table = ibcs2_sysent,
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.sv_mask = 0xff,
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.sv_sigsize = IBCS2_SIGTBLSZ,
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.sv_sigtbl = bsd_to_ibcs2_sig,
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.sv_errsize = ELAST + 1,
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.sv_errtbl = bsd_to_ibcs2_errno,
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.sv_transtrap = NULL,
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.sv_fixup = ibcs2_fixup,
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.sv_sendsig = sendsig,
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.sv_sigcode = sigcode, /* use generic trampoline */
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.sv_szsigcode = &szsigcode,
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.sv_prepsyscall = NULL,
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.sv_name = "IBCS2 COFF",
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.sv_coredump = NULL, /* we don't have a COFF coredump function */
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.sv_imgact_try = NULL,
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.sv_minsigstksz = IBCS2_MINSIGSTKSZ,
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.sv_pagesize = PAGE_SIZE,
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.sv_minuser = VM_MIN_ADDRESS,
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.sv_maxuser = VM_MAXUSER_ADDRESS,
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.sv_usrstack = USRSTACK,
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.sv_psstrings = PS_STRINGS,
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.sv_stackprot = VM_PROT_ALL,
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.sv_copyout_strings = exec_copyout_strings,
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.sv_setregs = exec_setregs,
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.sv_fixlimit = NULL,
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.sv_maxssiz = NULL,
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.sv_flags = SV_ABI_UNDEF | SV_IA32 | SV_ILP32,
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.sv_set_syscall_retval = cpu_set_syscall_retval,
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.sv_fetch_syscall_args = cpu_fetch_syscall_args,
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.sv_syscallnames = NULL,
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};
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static int
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ibcs2_fixup(register_t **stack_base, struct image_params *imgp)
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{
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return (suword(--(*stack_base), imgp->args->argc));
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}
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/*
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* Create an "ibcs2" module that does nothing but allow checking for
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* the presence of the subsystem.
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*/
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static int
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ibcs2_modevent(module_t mod, int type, void *unused)
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{
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struct proc *p = NULL;
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int rval = 0;
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switch(type) {
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case MOD_LOAD:
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break;
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case MOD_UNLOAD:
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/* if this was an ELF module we'd use elf_brand_inuse()... */
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sx_slock(&allproc_lock);
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FOREACH_PROC_IN_SYSTEM(p) {
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if (p->p_sysent == &ibcs2_svr3_sysvec) {
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rval = EBUSY;
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break;
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}
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}
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sx_sunlock(&allproc_lock);
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break;
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default:
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rval = EOPNOTSUPP;
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break;
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}
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return (rval);
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}
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static moduledata_t ibcs2_mod = {
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"ibcs2",
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ibcs2_modevent,
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0
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};
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DECLARE_MODULE(ibcs2, ibcs2_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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