diff options
Diffstat (limited to 'sys/amd64/cloudabi64/cloudabi64_sysvec.c')
| -rw-r--r-- | sys/amd64/cloudabi64/cloudabi64_sysvec.c | 64 |
1 files changed, 60 insertions, 4 deletions
diff --git a/sys/amd64/cloudabi64/cloudabi64_sysvec.c b/sys/amd64/cloudabi64/cloudabi64_sysvec.c index 16d3ef9..b94c0ef 100644 --- a/sys/amd64/cloudabi64/cloudabi64_sysvec.c +++ b/sys/amd64/cloudabi64/cloudabi64_sysvec.c @@ -27,6 +27,7 @@ __FBSDID("$FreeBSD$"); #include <sys/param.h> +#include <sys/imgact.h> #include <sys/kernel.h> #include <sys/proc.h> #include <sys/sysent.h> @@ -47,6 +48,45 @@ extern const char *cloudabi64_syscallnames[]; extern struct sysent cloudabi64_sysent[]; static int +cloudabi64_fixup_tcb(register_t **stack_base, struct image_params *imgp) +{ + int error; + register_t tcbptr; + + /* Place auxiliary vector and TCB on the stack. */ + error = cloudabi64_fixup(stack_base, imgp); + if (error != 0) + return (error); + + /* + * On x86-64, the TCB is referred to by %fs:0. Take some space + * from the top of the stack to store a single element array, + * containing a pointer to the TCB. %fs base will point to this. + */ + tcbptr = (register_t)*stack_base; + return (copyout(&tcbptr, --*stack_base, sizeof(tcbptr))); +} + +static void +cloudabi64_proc_setregs(struct thread *td, struct image_params *imgp, + unsigned long stack) +{ + struct trapframe *regs; + + exec_setregs(td, imgp, stack); + + /* + * The stack now contains a pointer to the TCB, the TCB itself, + * and the auxiliary vector. Let %rdx point to the auxiliary + * vector, and set %fs base to the address of the TCB. + */ + regs = td->td_frame; + regs->tf_rdi = stack + sizeof(register_t) + + roundup(sizeof(cloudabi64_tcb_t), sizeof(register_t)); + (void)cpu_set_user_tls(td, (void *)stack); +} + +static int cloudabi64_fetch_syscall_args(struct thread *td, struct syscall_args *sa) { struct trapframe *frame = td->td_frame; @@ -109,16 +149,29 @@ cloudabi64_schedtail(struct thread *td) frame->tf_rdx = td->td_tid; } -void +int cloudabi64_thread_setregs(struct thread *td, - const cloudabi64_threadattr_t *attr) + const cloudabi64_threadattr_t *attr, uint64_t tcb) { struct trapframe *frame; stack_t stack; + uint64_t tcbptr; + int error; + + /* + * On x86-64, the TCB is referred to by %fs:0. Take some space + * from the top of the stack to store a single element array, + * containing a pointer to the TCB. %fs base will point to this. + */ + tcbptr = rounddown(attr->stack + attr->stack_size - sizeof(tcbptr), + _Alignof(tcbptr)); + error = copyout(&tcb, (void *)tcbptr, sizeof(tcb)); + if (error != 0) + return (error); /* Perform standard register initialization. */ stack.ss_sp = (void *)attr->stack; - stack.ss_size = attr->stack_size; + stack.ss_size = tcbptr - attr->stack; cpu_set_upcall_kse(td, (void *)attr->entry_point, NULL, &stack); /* @@ -129,12 +182,14 @@ cloudabi64_thread_setregs(struct thread *td, frame = td->td_frame; frame->tf_rdi = td->td_tid; frame->tf_rsi = attr->argument; + + return (cpu_set_user_tls(td, (void *)tcbptr)); } static struct sysentvec cloudabi64_elf_sysvec = { .sv_size = CLOUDABI64_SYS_MAXSYSCALL, .sv_table = cloudabi64_sysent, - .sv_fixup = cloudabi64_fixup, + .sv_fixup = cloudabi64_fixup_tcb, .sv_name = "CloudABI ELF64", .sv_coredump = elf64_coredump, .sv_pagesize = PAGE_SIZE, @@ -143,6 +198,7 @@ static struct sysentvec cloudabi64_elf_sysvec = { .sv_usrstack = USRSTACK, .sv_stackprot = VM_PROT_READ | VM_PROT_WRITE, .sv_copyout_strings = cloudabi64_copyout_strings, + .sv_setregs = cloudabi64_proc_setregs, .sv_flags = SV_ABI_CLOUDABI | SV_CAPSICUM | SV_LP64, .sv_set_syscall_retval = cloudabi64_set_syscall_retval, .sv_fetch_syscall_args = cloudabi64_fetch_syscall_args, |
