2 * Copyright (c) 2015-2017 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/cloudabi32/cloudabi32_syscall.h>
45 #include <compat/cloudabi32/cloudabi32_util.h>
47 extern const char *cloudabi32_syscallnames[];
48 extern struct sysent cloudabi32_sysent[];
51 cloudabi32_proc_setregs(struct thread *td, struct image_params *imgp,
54 struct trapframe *regs;
57 memset(regs, 0, sizeof(*regs));
59 stack + roundup(sizeof(cloudabi32_tcb_t), sizeof(register_t));
60 regs->tf_x[13] = STACKALIGN(stack);
61 regs->tf_elr = imgp->entry_addr;
62 regs->tf_spsr |= PSR_AARCH32;
63 (void)cpu_set_user_tls(td, TO_PTR(stack));
67 cloudabi32_fetch_syscall_args(struct thread *td)
69 struct trapframe *frame;
70 struct syscall_args *sa;
76 /* Obtain system call number. */
77 sa->code = frame->tf_x[0];
78 if (sa->code >= CLOUDABI32_SYS_MAXSYSCALL)
80 sa->callp = &cloudabi32_sysent[sa->code];
83 * Fetch system call arguments.
85 * The vDSO has already made sure that the arguments are
86 * eight-byte aligned. Pointers and size_t parameters are
87 * zero-extended. This makes it possible to copy in the
88 * arguments directly. As long as the call doesn't use 32-bit
89 * data structures, we can just invoke the same system call
90 * implementation used by 64-bit processes.
92 error = copyin((void *)frame->tf_x[2], sa->args,
93 sa->callp->sy_narg * sizeof(sa->args[0]));
97 /* Default system call return values. */
104 cloudabi32_set_syscall_retval(struct thread *td, int error)
106 struct trapframe *frame = td->td_frame;
111 * System call succeeded.
113 * Simply copy out the 64-bit return values into the
114 * same buffer provided for system call arguments. The
115 * vDSO will copy them to the right spot, truncating
116 * pointers and size_t values to 32 bits.
118 if (copyout(td->td_retval, (void *)frame->tf_x[2],
119 sizeof(td->td_retval)) == 0) {
121 frame->tf_spsr &= ~PSR_C;
123 frame->tf_x[0] = CLOUDABI_EFAULT;
124 frame->tf_spsr |= PSR_C;
128 /* Restart system call. */
134 /* System call returned an error. */
135 frame->tf_x[0] = cloudabi_convert_errno(error);
136 frame->tf_spsr |= PSR_C;
142 cloudabi32_schedtail(struct thread *td)
144 struct trapframe *frame = td->td_frame;
145 register_t retval[2];
147 /* Return values for processes returning from fork. */
148 if ((td->td_pflags & TDP_FORKING) != 0) {
149 retval[0] = CLOUDABI_PROCESS_CHILD;
150 retval[1] = td->td_tid;
151 copyout(retval, (void *)frame->tf_x[2], sizeof(retval));
153 frame->tf_spsr |= PSR_AARCH32;
157 cloudabi32_thread_setregs(struct thread *td,
158 const cloudabi32_threadattr_t *attr, uint32_t tcb)
160 struct trapframe *frame;
163 * Pass in the thread ID of the new thread and the argument
164 * pointer provided by the parent thread in as arguments to the
167 frame = td->td_frame;
168 memset(frame, 0, sizeof(*frame));
169 frame->tf_x[0] = td->td_tid;
170 frame->tf_x[1] = attr->argument;
171 frame->tf_x[13] = STACKALIGN(attr->stack + attr->stack_len);
172 frame->tf_elr = attr->entry_point;
175 return (cpu_set_user_tls(td, TO_PTR(tcb)));
178 static struct sysentvec cloudabi32_elf_sysvec = {
179 .sv_size = CLOUDABI32_SYS_MAXSYSCALL,
180 .sv_table = cloudabi32_sysent,
181 .sv_fixup = cloudabi32_fixup,
182 .sv_name = "CloudABI ELF32",
183 .sv_coredump = elf32_coredump,
184 .sv_elf_core_osabi = ELFOSABI_FREEBSD,
185 .sv_elf_core_abi_vendor = FREEBSD_ABI_VENDOR,
186 .sv_elf_core_prepare_notes = elf32_prepare_notes,
187 .sv_minuser = VM_MIN_ADDRESS,
188 .sv_maxuser = (uintmax_t)1 << 32,
189 .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE,
190 .sv_copyout_strings = cloudabi32_copyout_strings,
191 .sv_setregs = cloudabi32_proc_setregs,
192 .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_ILP32,
193 .sv_set_syscall_retval = cloudabi32_set_syscall_retval,
194 .sv_fetch_syscall_args = cloudabi32_fetch_syscall_args,
195 .sv_syscallnames = cloudabi32_syscallnames,
196 .sv_schedtail = cloudabi32_schedtail,
199 INIT_SYSENTVEC(elf_sysvec, &cloudabi32_elf_sysvec);
201 Elf32_Brandinfo cloudabi32_brand = {
202 .brand = ELFOSABI_CLOUDABI,
204 .sysvec = &cloudabi32_elf_sysvec,
205 .flags = BI_BRAND_ONLY_STATIC,