/*- * Copyright (c) 2002 Doug Rabson * Copyright (c) 2003 Peter Wemm * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include "opt_compat.h" #define __ELF_WORD_SIZE 32 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static register_t *ia32_copyout_strings(struct image_params *imgp); static void ia32_setregs(struct thread *td, u_long entry, u_long stack, u_long ps_strings); extern struct sysent ia32_sysent[]; struct sysentvec ia32_freebsd_sysvec = { SYS_MAXSYSCALL, ia32_sysent, 0, 0, NULL, 0, NULL, NULL, elf32_freebsd_fixup, ia32_sendsig, ia32_sigcode, &sz_ia32_sigcode, NULL, "FreeBSD ELF32", elf32_coredump, NULL, MINSIGSTKSZ, PAGE_SIZE, 0, IA32_USRSTACK, IA32_USRSTACK, IA32_PS_STRINGS, VM_PROT_ALL, ia32_copyout_strings, ia32_setregs }; static Elf32_Brandinfo ia32_brand_info = { ELFOSABI_FREEBSD, EM_386, "FreeBSD", "/compat/ia32", "/usr/libexec/ld-elf.so.1", &ia32_freebsd_sysvec }; SYSINIT(ia32, SI_SUB_EXEC, SI_ORDER_ANY, (sysinit_cfunc_t) elf32_insert_brand_entry, &ia32_brand_info); extern int _ucode32sel, _udatasel; static register_t * ia32_copyout_strings(struct image_params *imgp) { int argc, envc; u_int32_t *vectp; char *stringp, *destp; u_int32_t *stack_base; struct ia32_ps_strings *arginfo; int szsigcode; /* * Calculate string base and vector table pointers. * Also deal with signal trampoline code for this exec type. */ arginfo = (struct ia32_ps_strings *)IA32_PS_STRINGS; szsigcode = *(imgp->proc->p_sysent->sv_szsigcode); destp = (caddr_t)arginfo - szsigcode - SPARE_USRSPACE - roundup((ARG_MAX - imgp->stringspace), sizeof(char *)); /* * install sigcode */ if (szsigcode) copyout(imgp->proc->p_sysent->sv_sigcode, ((caddr_t)arginfo - szsigcode), szsigcode); /* * If we have a valid auxargs ptr, prepare some room * on the stack. */ if (imgp->auxargs) { /* * 'AT_COUNT*2' is size for the ELF Auxargs data. This is for * lower compatibility. */ imgp->auxarg_size = (imgp->auxarg_size) ? imgp->auxarg_size : (AT_COUNT * 2); /* * The '+ 2' is for the null pointers at the end of each of * the arg and env vector sets,and imgp->auxarg_size is room * for argument of Runtime loader. */ vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2 + imgp->auxarg_size) * sizeof(u_int32_t)); } else /* * The '+ 2' is for the null pointers at the end of each of * the arg and env vector sets */ vectp = (u_int32_t *) (destp - (imgp->argc + imgp->envc + 2) * sizeof(u_int32_t)); /* * vectp also becomes our initial stack base */ stack_base = vectp; stringp = imgp->stringbase; argc = imgp->argc; envc = imgp->envc; /* * Copy out strings - arguments and environment. */ copyout(stringp, destp, ARG_MAX - imgp->stringspace); /* * Fill in "ps_strings" struct for ps, w, etc. */ suword32(&arginfo->ps_argvstr, (u_int32_t)(intptr_t)vectp); suword32(&arginfo->ps_nargvstr, argc); /* * Fill in argument portion of vector table. */ for (; argc > 0; --argc) { suword32(vectp++, (u_int32_t)(intptr_t)destp); while (*stringp++ != 0) destp++; destp++; } /* a null vector table pointer separates the argp's from the envp's */ suword32(vectp++, 0); suword32(&arginfo->ps_envstr, (u_int32_t)(intptr_t)vectp); suword32(&arginfo->ps_nenvstr, envc); /* * Fill in environment portion of vector table. */ for (; envc > 0; --envc) { suword32(vectp++, (u_int32_t)(intptr_t)destp); while (*stringp++ != 0) destp++; destp++; } /* end of vector table is a null pointer */ suword32(vectp, 0); return ((register_t *)stack_base); } /* * Clear registers on exec */ void ia32_setregs(td, entry, stack, ps_strings) struct thread *td; u_long entry; u_long stack; u_long ps_strings; { struct trapframe *regs = td->td_frame; struct pcb *pcb = td->td_pcb; wrmsr(MSR_FSBASE, 0); wrmsr(MSR_KGSBASE, 0); /* User value while we're in the kernel */ pcb->pcb_fsbase = 0; pcb->pcb_gsbase = 0; load_ds(_udatasel); load_es(_udatasel); load_fs(_udatasel); load_gs(_udatasel); pcb->pcb_ds = _udatasel; pcb->pcb_es = _udatasel; pcb->pcb_fs = _udatasel; pcb->pcb_gs = _udatasel; bzero((char *)regs, sizeof(struct trapframe)); regs->tf_rip = entry; regs->tf_rsp = stack; regs->tf_rflags = PSL_USER | (regs->tf_rflags & PSL_T); regs->tf_ss = _udatasel; regs->tf_cs = _ucode32sel; regs->tf_rbx = ps_strings; /* * Arrange to trap the next npx or `fwait' instruction (see npx.c * for why fwait must be trapped at least if there is an npx or an * emulator). This is mainly to handle the case where npx0 is not * configured, since the npx routines normally set up the trap * otherwise. It should be done only at boot time, but doing it * here allows modifying `npx_exists' for testing the emulator on * systems with an npx. */ load_cr0(rcr0() | CR0_MP | CR0_TS); fpstate_drop(td); /* Return via doreti so that we can change to a different %cs */ pcb->pcb_flags |= PCB_FULLCTX; td->td_retval[1] = 0; }