cloudabi32_sysvec.c revision 321343
1/*- 2 * Copyright (c) 2015-2016 Nuxi, https://nuxi.nl/ 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD: stable/11/sys/arm/cloudabi32/cloudabi32_sysvec.c 321343 2017-07-21 18:06:57Z kib $"); 28 29#include <sys/param.h> 30#include <sys/imgact.h> 31#include <sys/kernel.h> 32#include <sys/proc.h> 33#include <sys/sysent.h> 34 35#include <vm/vm.h> 36#include <vm/pmap.h> 37 38#include <machine/frame.h> 39#include <machine/pcb.h> 40#include <machine/vmparam.h> 41 42#include <compat/cloudabi/cloudabi_util.h> 43 44#include <compat/cloudabi32/cloudabi32_syscall.h> 45#include <compat/cloudabi32/cloudabi32_util.h> 46 47extern const char *cloudabi32_syscallnames[]; 48extern struct sysent cloudabi32_sysent[]; 49 50static void 51cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp, 52 unsigned long stack) 53{ 54 struct trapframe *regs; 55 56 exec_setregs(td, imgp, stack); 57 58 /* 59 * The stack now contains a pointer to the TCB and the auxiliary 60 * vector. Let r0 point to the auxiliary vector, and set 61 * tpidrurw to the TCB. 62 */ 63 regs = td->td_frame; 64 regs->tf_r0 = td->td_retval[0] = 65 stack + roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t)); 66 (void)cpu_set_user_tls(td, (void *)stack); 67} 68 69static int 70cloudabi32_fetch_syscall_args(struct thread *td) 71{ 72 struct trapframe *frame; 73 struct syscall_args *sa; 74 int error; 75 76 frame = td->td_frame; 77 sa = &td->td_sa; 78 79 /* Obtain system call number. */ 80 sa->code = frame->tf_r12; 81 if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL) 82 return (ENOSYS); 83 sa->callp = &cloudabi32_sysent[sa->code]; 84 sa->narg = sa->callp->sy_narg; 85 86 /* Fetch system call arguments from registers and the stack. */ 87 sa->args[0] = frame->tf_r0; 88 sa->args[1] = frame->tf_r1; 89 sa->args[2] = frame->tf_r2; 90 sa->args[3] = frame->tf_r3; 91 if (sa->narg > 4) { 92 error = copyin((void *)td->td_frame->tf_usr_sp, &sa->args[4], 93 (sa->narg - 4) * sizeof(register_t)); 94 if (error != 0) 95 return (error); 96 } 97 98 /* Default system call return values. */ 99 td->td_retval[0] = 0; 100 td->td_retval[1] = frame->tf_r1; 101 return (0); 102} 103 104static void 105cloudabi32_set_syscall_retval(struct thread *td, int error) 106{ 107 struct trapframe *frame = td->td_frame; 108 109 switch (error) { 110 case 0: 111 /* System call succeeded. */ 112 frame->tf_r0 = td->td_retval[0]; 113 frame->tf_r1 = td->td_retval[1]; 114 frame->tf_spsr &= ~PSR_C; 115 break; 116 case ERESTART: 117 /* Restart system call. */ 118 frame->tf_pc -= 4; 119 break; 120 case EJUSTRETURN: 121 break; 122 default: 123 /* System call returned an error. */ 124 frame->tf_r0 = cloudabi_convert_errno(error); 125 frame->tf_spsr |= PSR_C; 126 break; 127 } 128} 129 130static void 131cloudabi32_schedtail(struct thread *td) 132{ 133 struct trapframe *frame = td->td_frame; 134 135 /* 136 * Initial register values for processes returning from fork. 137 * Make sure that we only set these values when forking, not 138 * when creating a new thread. 139 */ 140 if ((td->td_pflags & TDP_FORKING) != 0) { 141 frame->tf_r0 = CLOUDABI_PROCESS_CHILD; 142 frame->tf_r1 = td->td_tid; 143 } 144} 145 146int 147cloudabi32_thread_setregs(struct thread *td, 148 const cloudabi32_threadattr_t *attr, uint32_t tcb) 149{ 150 struct trapframe *frame; 151 stack_t stack; 152 153 /* Perform standard register initialization. */ 154 stack.ss_sp = TO_PTR(attr->stack); 155 stack.ss_size = attr->stack_len; 156 cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack); 157 158 /* 159 * Pass in the thread ID of the new thread and the argument 160 * pointer provided by the parent thread in as arguments to the 161 * entry point. 162 */ 163 frame = td->td_frame; 164 frame->tf_r0 = td->td_tid; 165 frame->tf_r1 = attr->argument; 166 167 /* Set up TLS. */ 168 return (cpu_set_user_tls(td, (void *)tcb)); 169} 170 171static struct sysentvec cloudabi32_elf_sysvec = { 172 .sv_size = CLOUDABI32_SYS_MAXSYSCALL, 173 .sv_table = cloudabi32_sysent, 174 .sv_fixup = cloudabi32_fixup, 175 .sv_name = "CloudABI ELF32", 176 .sv_coredump = elf32_coredump, 177 .sv_pagesize = PAGE_SIZE, 178 .sv_minuser = VM_MIN_ADDRESS, 179 .sv_maxuser = VM_MAXUSER_ADDRESS, 180 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, 181 .sv_copyout_strings = cloudabi32_copyout_strings, 182 .sv_setregs = cloudabi32_proc_setregs, 183 .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_ILP32, 184 .sv_set_syscall_retval = cloudabi32_set_syscall_retval, 185 .sv_fetch_syscall_args = cloudabi32_fetch_syscall_args, 186 .sv_syscallnames = cloudabi32_syscallnames, 187 .sv_schedtail = cloudabi32_schedtail, 188}; 189 190INIT_SYSENTVEC(elf_sysvec, &cloudabi32_elf_sysvec); 191 192Elf32_Brandinfo cloudabi32_brand = { 193 .brand = ELFOSABI_CLOUDABI, 194 .machine = EM_ARM, 195 .sysvec = &cloudabi32_elf_sysvec, 196 .flags = BI_BRAND_ONLY_STATIC, 197}; 198