diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv64/kernel/vmem.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/riscv64/kernel/vmem.c b/arch/riscv64/kernel/vmem.c index a1ca54e..fa3c1c2 100644 --- a/arch/riscv64/kernel/vmem.c +++ b/arch/riscv64/kernel/vmem.c @@ -599,8 +599,8 @@ stat_t setup_rpc_stack(struct tcb *t) { /* by default rpc stack is marked inaccessible to generate segfaults on * access so as to ease stack usage tracking */ - vmflags_t flags = VM_V | VM_R | - VM_W /*| VM_U note how this is missing */; + vmflags_t flags = VM_V | VM_R | VM_W; + /* note how VM_U is missing, userspace messing about will be done later */ for (size_t i = 0; i < rpc_pages; ++i) { pm_t page = alloc_page(BASE_PAGE); @@ -611,7 +611,6 @@ stat_t setup_rpc_stack(struct tcb *t) RPC_STACK_BASE + BASE_PAGE_SIZE * i, flags, BASE_PAGE)) return ERR_OOMEM; - } /* we allocated a second order page for rpc stack usage */ @@ -625,9 +624,9 @@ stat_t setup_rpc_stack(struct tcb *t) /* we count downward in base pages, the top page is *always* reserved */ t->arch.rpc_idx = rpc_pages - 1; - /* mark our stack region inaccessible to userspace */ - vm_t stack_top = t->rpc_stack - BASE_PAGE_SIZE; - set_stack(t, stack_top); + + /* point registers to stack */ + t->regs = t->rpc_stack - sizeof(struct call_ctx); return OK; } |