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,uintptr_t stack)51 cloudabi64_proc_setregs(struct thread *td, struct image_params *imgp,
52 uintptr_t 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
85 /* Fetch system call arguments. */
86 for (i = 0; i < MAXARGS; i++)
87 sa->args[i] = frame->tf_x[i];
88
89 /* Default system call return values. */
90 td->td_retval[0] = 0;
91 td->td_retval[1] = frame->tf_x[1];
92 return (0);
93 }
94
95 static void
cloudabi64_set_syscall_retval(struct thread * td,int error)96 cloudabi64_set_syscall_retval(struct thread *td, int error)
97 {
98 struct trapframe *frame = td->td_frame;
99
100 switch (error) {
101 case 0:
102 /* System call succeeded. */
103 frame->tf_x[0] = td->td_retval[0];
104 frame->tf_x[1] = td->td_retval[1];
105 frame->tf_spsr &= ~PSR_C;
106 break;
107 case ERESTART:
108 /* Restart system call. */
109 frame->tf_elr -= 4;
110 break;
111 case EJUSTRETURN:
112 break;
113 default:
114 /* System call returned an error. */
115 frame->tf_x[0] = cloudabi_convert_errno(error);
116 frame->tf_spsr |= PSR_C;
117 break;
118 }
119 }
120
121 static void
cloudabi64_schedtail(struct thread * td)122 cloudabi64_schedtail(struct thread *td)
123 {
124 struct trapframe *frame = td->td_frame;
125
126 /*
127 * Initial register values for processes returning from fork.
128 * Make sure that we only set these values when forking, not
129 * when creating a new thread.
130 */
131 if ((td->td_pflags & TDP_FORKING) != 0) {
132 frame->tf_x[0] = CLOUDABI_PROCESS_CHILD;
133 frame->tf_x[1] = td->td_tid;
134 }
135 }
136
137 int
cloudabi64_thread_setregs(struct thread * td,const cloudabi64_threadattr_t * attr,uint64_t tcb)138 cloudabi64_thread_setregs(struct thread *td,
139 const cloudabi64_threadattr_t *attr, uint64_t tcb)
140 {
141 struct trapframe *frame;
142 stack_t stack;
143
144 /* Perform standard register initialization. */
145 stack.ss_sp = TO_PTR(attr->stack);
146 stack.ss_size = attr->stack_len;
147 cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
148
149 /*
150 * Pass in the thread ID of the new thread and the argument
151 * pointer provided by the parent thread in as arguments to the
152 * entry point.
153 */
154 frame = td->td_frame;
155 frame->tf_x[0] = td->td_tid;
156 frame->tf_x[1] = attr->argument;
157
158 /* Set up TLS. */
159 return (cpu_set_user_tls(td, TO_PTR(tcb)));
160 }
161
162 static struct sysentvec cloudabi64_elf_sysvec = {
163 .sv_size = CLOUDABI64_SYS_MAXSYSCALL,
164 .sv_table = cloudabi64_sysent,
165 .sv_fixup = cloudabi64_fixup,
166 .sv_name = "CloudABI ELF64",
167 .sv_coredump = elf64_coredump,
168 .sv_minuser = VM_MIN_ADDRESS,
169 .sv_maxuser = VM_MAXUSER_ADDRESS,
170 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
171 .sv_copyout_strings = cloudabi64_copyout_strings,
172 .sv_setregs = cloudabi64_proc_setregs,
173 .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64,
174 .sv_set_syscall_retval = cloudabi64_set_syscall_retval,
175 .sv_fetch_syscall_args = cloudabi64_fetch_syscall_args,
176 .sv_syscallnames = cloudabi64_syscallnames,
177 .sv_schedtail = cloudabi64_schedtail,
178 };
179
180 INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);
181
182 Elf64_Brandinfo cloudabi64_brand = {
183 .brand = ELFOSABI_CLOUDABI,
184 .machine = EM_AARCH64,
185 .sysvec = &cloudabi64_elf_sysvec,
186 .flags = BI_CAN_EXEC_DYN | BI_BRAND_ONLY_STATIC,
187 };
188