1 /*-
2 * Copyright (c) 2015 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("$FreeBSD$");
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/cloudabi64/cloudabi64_syscall.h>
45 #include <compat/cloudabi64/cloudabi64_util.h>
46
47 extern const char *cloudabi64_syscallnames[];
48 extern struct sysent cloudabi64_sysent[];
49
50 static void
cloudabi64_proc_setregs(struct thread * td,struct image_params * imgp,unsigned long stack)51 cloudabi64_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 x0 point to the auxiliary vector, and set
61 * tpidr_el0 to the TCB.
62 */
63 regs = td->td_frame;
64 regs->tf_x[0] =
65 stack + roundup(sizeof(cloudabi64_tcb_t), sizeof(register_t));
66 (void)cpu_set_user_tls(td, TO_PTR(stack));
67 }
68
69 static int
cloudabi64_fetch_syscall_args(struct thread * td)70 cloudabi64_fetch_syscall_args(struct thread *td)
71 {
72 struct trapframe *frame;
73 struct syscall_args *sa;
74 int i;
75
76 frame = td->td_frame;
77 sa = &td->td_sa;
78
79 /* Obtain system call number. */
80 sa->code = frame->tf_x[8];
81 if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
82 return (ENOSYS);
83 sa->callp = &cloudabi64_sysent[sa->code];
84 sa->narg = sa->callp->sy_narg;
85
86 /* Fetch system call arguments. */
87 for (i = 0; i < MAXARGS; i++)
88 sa->args[i] = frame->tf_x[i];
89
90 /* Default system call return values. */
91 td->td_retval[0] = 0;
92 td->td_retval[1] = frame->tf_x[1];
93 return (0);
94 }
95
96 static void
cloudabi64_set_syscall_retval(struct thread * td,int error)97 cloudabi64_set_syscall_retval(struct thread *td, int error)
98 {
99 struct trapframe *frame = td->td_frame;
100
101 switch (error) {
102 case 0:
103 /* System call succeeded. */
104 frame->tf_x[0] = td->td_retval[0];
105 frame->tf_x[1] = td->td_retval[1];
106 frame->tf_spsr &= ~PSR_C;
107 break;
108 case ERESTART:
109 /* Restart system call. */
110 frame->tf_elr -= 4;
111 break;
112 case EJUSTRETURN:
113 break;
114 default:
115 /* System call returned an error. */
116 frame->tf_x[0] = cloudabi_convert_errno(error);
117 frame->tf_spsr |= PSR_C;
118 break;
119 }
120 }
121
122 static void
cloudabi64_schedtail(struct thread * td)123 cloudabi64_schedtail(struct thread *td)
124 {
125 struct trapframe *frame = td->td_frame;
126
127 /*
128 * Initial register values for processes returning from fork.
129 * Make sure that we only set these values when forking, not
130 * when creating a new thread.
131 */
132 if ((td->td_pflags & TDP_FORKING) != 0) {
133 frame->tf_x[0] = CLOUDABI_PROCESS_CHILD;
134 frame->tf_x[1] = td->td_tid;
135 }
136 }
137
138 int
cloudabi64_thread_setregs(struct thread * td,const cloudabi64_threadattr_t * attr,uint64_t tcb)139 cloudabi64_thread_setregs(struct thread *td,
140 const cloudabi64_threadattr_t *attr, uint64_t tcb)
141 {
142 struct trapframe *frame;
143 stack_t stack;
144
145 /* Perform standard register initialization. */
146 stack.ss_sp = TO_PTR(attr->stack);
147 stack.ss_size = attr->stack_len;
148 cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
149
150 /*
151 * Pass in the thread ID of the new thread and the argument
152 * pointer provided by the parent thread in as arguments to the
153 * entry point.
154 */
155 frame = td->td_frame;
156 frame->tf_x[0] = td->td_tid;
157 frame->tf_x[1] = attr->argument;
158
159 /* Set up TLS. */
160 return (cpu_set_user_tls(td, TO_PTR(tcb)));
161 }
162
163 static struct sysentvec cloudabi64_elf_sysvec = {
164 .sv_size = CLOUDABI64_SYS_MAXSYSCALL,
165 .sv_table = cloudabi64_sysent,
166 .sv_fixup = cloudabi64_fixup,
167 .sv_name = "CloudABI ELF64",
168 .sv_coredump = elf64_coredump,
169 .sv_minuser = VM_MIN_ADDRESS,
170 .sv_maxuser = VM_MAXUSER_ADDRESS,
171 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
172 .sv_copyout_strings = cloudabi64_copyout_strings,
173 .sv_setregs = cloudabi64_proc_setregs,
174 .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64,
175 .sv_set_syscall_retval = cloudabi64_set_syscall_retval,
176 .sv_fetch_syscall_args = cloudabi64_fetch_syscall_args,
177 .sv_syscallnames = cloudabi64_syscallnames,
178 .sv_schedtail = cloudabi64_schedtail,
179 };
180
181 INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);
182
183 Elf64_Brandinfo cloudabi64_brand = {
184 .brand = ELFOSABI_CLOUDABI,
185 .machine = EM_AARCH64,
186 .sysvec = &cloudabi64_elf_sysvec,
187 .flags = BI_CAN_EXEC_DYN | BI_BRAND_ONLY_STATIC,
188 };
189