2 * Copyright (c) 2015 Nuxi, https://nuxi.nl/
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
29 #include <sys/param.h>
30 #include <sys/imgact.h>
31 #include <sys/kernel.h>
33 #include <sys/sysent.h>
38 #include <machine/frame.h>
39 #include <machine/pcb.h>
40 #include <machine/vmparam.h>
42 #include <compat/cloudabi/cloudabi_util.h>
44 #include <compat/cloudabi64/cloudabi64_syscall.h>
45 #include <compat/cloudabi64/cloudabi64_util.h>
47 extern const char *cloudabi64_syscallnames[];
48 extern struct sysent cloudabi64_sysent[];
51 cloudabi64_fixup_tcb(register_t **stack_base, struct image_params *imgp)
56 /* Place auxiliary vector and TCB on the stack. */
57 error = cloudabi64_fixup(stack_base, imgp);
62 * On x86-64, the TCB is referred to by %fs:0. Take some space
63 * from the top of the stack to store a single element array,
64 * containing a pointer to the TCB. %fs base will point to this.
66 tcbptr = (register_t)*stack_base;
67 return (copyout(&tcbptr, --*stack_base, sizeof(tcbptr)));
71 cloudabi64_proc_setregs(struct thread *td, struct image_params *imgp,
74 struct trapframe *regs;
76 exec_setregs(td, imgp, stack);
79 * The stack now contains a pointer to the TCB, the TCB itself,
80 * and the auxiliary vector. Let %rdx point to the auxiliary
81 * vector, and set %fs base to the address of the TCB.
84 regs->tf_rdi = stack + sizeof(register_t) +
85 roundup(sizeof(cloudabi64_tcb_t), sizeof(register_t));
86 (void)cpu_set_user_tls(td, (void *)stack);
90 cloudabi64_fetch_syscall_args(struct thread *td, struct syscall_args *sa)
92 struct trapframe *frame = td->td_frame;
94 /* Obtain system call number. */
95 sa->code = frame->tf_rax;
96 if (sa->code >= CLOUDABI64_SYS_MAXSYSCALL)
98 sa->callp = &cloudabi64_sysent[sa->code];
99 sa->narg = sa->callp->sy_narg;
101 /* Fetch system call arguments. */
102 sa->args[0] = frame->tf_rdi;
103 sa->args[1] = frame->tf_rsi;
104 sa->args[2] = frame->tf_rdx;
105 sa->args[3] = frame->tf_rcx; /* Actually %r10. */
106 sa->args[4] = frame->tf_r8;
107 sa->args[5] = frame->tf_r9;
109 /* Default system call return values. */
110 td->td_retval[0] = 0;
111 td->td_retval[1] = frame->tf_rdx;
116 cloudabi64_set_syscall_retval(struct thread *td, int error)
118 struct trapframe *frame = td->td_frame;
122 /* System call succeeded. */
123 frame->tf_rax = td->td_retval[0];
124 frame->tf_rdx = td->td_retval[1];
125 frame->tf_rflags &= ~PSL_C;
128 /* Restart system call. */
129 frame->tf_rip -= frame->tf_err;
130 frame->tf_r10 = frame->tf_rcx;
131 set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
136 /* System call returned an error. */
137 frame->tf_rax = cloudabi_convert_errno(error);
138 frame->tf_rflags |= PSL_C;
144 cloudabi64_schedtail(struct thread *td)
146 struct trapframe *frame = td->td_frame;
148 /* Initial register values for processes returning from fork. */
149 frame->tf_rax = CLOUDABI_PROCESS_CHILD;
150 frame->tf_rdx = td->td_tid;
154 cloudabi64_thread_setregs(struct thread *td,
155 const cloudabi64_threadattr_t *attr, uint64_t tcb)
157 struct trapframe *frame;
163 * On x86-64, the TCB is referred to by %fs:0. Take some space
164 * from the top of the stack to store a single element array,
165 * containing a pointer to the TCB. %fs base will point to this.
167 tcbptr = rounddown(attr->stack + attr->stack_len - sizeof(tcbptr),
169 error = copyout(&tcb, (void *)tcbptr, sizeof(tcb));
173 /* Perform standard register initialization. */
174 stack.ss_sp = TO_PTR(attr->stack);
175 stack.ss_size = tcbptr - attr->stack;
176 cpu_set_upcall(td, TO_PTR(attr->entry_point), NULL, &stack);
179 * Pass in the thread ID of the new thread and the argument
180 * pointer provided by the parent thread in as arguments to the
183 frame = td->td_frame;
184 frame->tf_rdi = td->td_tid;
185 frame->tf_rsi = attr->argument;
187 return (cpu_set_user_tls(td, (void *)tcbptr));
190 static struct sysentvec cloudabi64_elf_sysvec = {
191 .sv_size = CLOUDABI64_SYS_MAXSYSCALL,
192 .sv_table = cloudabi64_sysent,
193 .sv_fixup = cloudabi64_fixup_tcb,
194 .sv_name = "CloudABI ELF64",
195 .sv_coredump = elf64_coredump,
196 .sv_pagesize = PAGE_SIZE,
197 .sv_minuser = VM_MIN_ADDRESS,
198 .sv_maxuser = VM_MAXUSER_ADDRESS,
199 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
200 .sv_copyout_strings = cloudabi64_copyout_strings,
201 .sv_setregs = cloudabi64_proc_setregs,
202 .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64,
203 .sv_set_syscall_retval = cloudabi64_set_syscall_retval,
204 .sv_fetch_syscall_args = cloudabi64_fetch_syscall_args,
205 .sv_syscallnames = cloudabi64_syscallnames,
206 .sv_schedtail = cloudabi64_schedtail,
209 INIT_SYSENTVEC(elf_sysvec, &cloudabi64_elf_sysvec);
211 Elf64_Brandinfo cloudabi64_brand = {
212 .brand = ELFOSABI_CLOUDABI,
213 .machine = EM_X86_64,
214 .sysvec = &cloudabi64_elf_sysvec,
215 .flags = BI_CAN_EXEC_DYN | BI_BRAND_ONLY_STATIC,