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Differential D6731 Diff 17628 head/sys/riscv/riscv/vm_machdep.c

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head/sys/riscv/riscv/vm_machdep.c

Show First 20 Lines • Show All 140 Lines • ▼ Show 20 Linescpu_set_syscall_retval(struct thread *td, int error)
default: default:
frame->tf_a[0] = error; frame->tf_a[0] = error;
frame->tf_t[0] = 1; /* syscall error */ frame->tf_t[0] = 1; /* syscall error */
break; break;
} }
} }
/* /*
* Initialize machine state (pcb and trap frame) for a new thread about to * Initialize machine state, mostly pcb and trap frame for a new
* upcall. Put enough state in the new thread's PCB to get it to go back * thread, about to return to userspace. Put enough state in the new
* userret(), where we can intercept it again to set the return (upcall) * thread's PCB to get it to go back to the fork_return(), which
* Address and stack, along with those from upcals that are from other sources * finalizes the thread state and handles peculiarities of the first
* such as those generated in thread_userret() itself. * return to userspace for the new thread.
*/ */
void void
cpu_set_upcall(struct thread *td, struct thread *td0) cpu_copy_thread(struct thread *td, struct thread *td0)
{ {
bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe)); bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));
bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb)); bcopy(td0->td_pcb, td->td_pcb, sizeof(struct pcb));
td->td_pcb->pcb_s[0] = (uintptr_t)fork_return; td->td_pcb->pcb_s[0] = (uintptr_t)fork_return;
td->td_pcb->pcb_s[1] = (uintptr_t)td; td->td_pcb->pcb_s[1] = (uintptr_t)td;
td->td_pcb->pcb_ra = (uintptr_t)fork_trampoline; td->td_pcb->pcb_ra = (uintptr_t)fork_trampoline;
td->td_pcb->pcb_sp = (uintptr_t)td->td_frame; td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
/* Setup to release spin count in fork_exit(). */ /* Setup to release spin count in fork_exit(). */
td->td_md.md_spinlock_count = 1; td->td_md.md_spinlock_count = 1;
td->td_md.md_saved_sstatus_ie = 1; td->td_md.md_saved_sstatus_ie = 1;
} }
/* /*
* Set that machine state for performing an upcall that has to * Set that machine state for performing an upcall that starts
* be done in thread_userret() so that those upcalls generated * the entry function with the given argument.
* in thread_userret() itself can be done as well.
*/ */
void void
cpu_set_upcall_kse(struct thread *td, void (*entry)(void *), void *arg, cpu_set_upcall(struct thread *td, void (*entry)(void *), void *arg,
stack_t *stack) stack_t *stack)
{ {
struct trapframe *tf = td->td_frame; struct trapframe *tf = td->td_frame;
tf->tf_sp = STACKALIGN((uintptr_t)stack->ss_sp + stack->ss_size); tf->tf_sp = STACKALIGN((uintptr_t)stack->ss_sp + stack->ss_size);
tf->tf_sepc = (register_t)entry; tf->tf_sepc = (register_t)entry;
tf->tf_a[0] = (register_t)arg; tf->tf_a[0] = (register_t)arg;
} }
Show All 39 Lines
/* /*
* Intercept the return address from a freshly forked process that has NOT * Intercept the return address from a freshly forked process that has NOT
* been scheduled yet. * been scheduled yet.
* *
* This is needed to make kernel threads stay in kernel mode. * This is needed to make kernel threads stay in kernel mode.
*/ */
void void
cpu_set_fork_handler(struct thread *td, void (*func)(void *), void *arg) cpu_fork_kthread_handler(struct thread *td, void (*func)(void *), void *arg)
{ {
td->td_pcb->pcb_s[0] = (uintptr_t)func; td->td_pcb->pcb_s[0] = (uintptr_t)func;
td->td_pcb->pcb_s[1] = (uintptr_t)arg; td->td_pcb->pcb_s[1] = (uintptr_t)arg;
td->td_pcb->pcb_ra = (uintptr_t)fork_trampoline; td->td_pcb->pcb_ra = (uintptr_t)fork_trampoline;
td->td_pcb->pcb_sp = (uintptr_t)td->td_frame; td->td_pcb->pcb_sp = (uintptr_t)td->td_frame;
} }
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