static void
cloudabi64_set_syscall_retval(struct thread *td, int error)
{
struct trapframe *frame = td->td_frame;
switch (error) {
case 0:
/* System call succeeded. */
frame->tf_x[0] = td->td_retval[0];
frame->tf_x[1] = td->td_retval[1];
frame->tf_spsr &= ~PSR_C;
break;
case ERESTART:
/* Restart system call. */
frame->tf_elr -= 4;
break;
case EJUSTRETURN:
break;
default:
/* System call returned an error. */
frame->tf_x[0] = cloudabi_convert_errno(error);
frame->tf_spsr |= PSR_C;
break;
}
}
static void
cloudabi32_set_syscall_retval(struct thread *td, int error)
{
struct trapframe *frame = td->td_frame;
switch (error) {
case 0:
/*
* System call succeeded.
*
* Simply copy out the 64-bit return values into the
* same buffer provided for system call arguments. The
* vDSO will copy them to the right spot, truncating
* pointers and size_t values to 32 bits.
*/
frame->tf_rax = copyout(td->td_retval, (void *)frame->tf_rcx,
sizeof(td->td_retval)) == 0 ? 0 : CLOUDABI_EFAULT;
break;
case ERESTART:
/* Restart system call. */
frame->tf_rip -= frame->tf_err;
frame->tf_r10 = frame->tf_rcx;
set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
break;
case EJUSTRETURN:
break;
default:
/* System call returned an error. */
frame->tf_rax = cloudabi_convert_errno(error);
break;
}
}
static int
aarch64_cloudabi64_fetch_retval(struct trussinfo *trussinfo, long *retval,
int *errorp)
{
struct reg regs;
lwpid_t tid;
tid = trussinfo->curthread->tid;
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) == -1) {
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
return (-1);
}
retval[0] = regs.x[0];
retval[1] = regs.x[1];
*errorp = (regs.spsr & PSR_C) != 0;
if (*errorp)
retval[0] = cloudabi_convert_errno(retval[0]);
return (0);
}