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Diffstat (limited to 'freebsd/sys/sys/sysent.h')
| -rw-r--r-- | freebsd/sys/sys/sysent.h | 327 |
1 files changed, 327 insertions, 0 deletions
diff --git a/freebsd/sys/sys/sysent.h b/freebsd/sys/sys/sysent.h new file mode 100644 index 00000000..d1d9e99b --- /dev/null +++ b/freebsd/sys/sys/sysent.h @@ -0,0 +1,327 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1982, 1988, 1991 The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#ifndef _SYS_SYSENT_H_ +#define _SYS_SYSENT_H_ + +#include <bsm/audit.h> + +struct rlimit; +struct sysent; +struct thread; +struct ksiginfo; +struct syscall_args; + +enum systrace_probe_t { + SYSTRACE_ENTRY, + SYSTRACE_RETURN, +}; + +typedef int sy_call_t(struct thread *, void *); + +typedef void (*systrace_probe_func_t)(struct syscall_args *, + enum systrace_probe_t, int); +typedef void (*systrace_args_func_t)(int, void *, uint64_t *, int *); + +#ifdef _KERNEL +extern bool systrace_enabled; +#endif +extern systrace_probe_func_t systrace_probe_func; + +struct sysent { /* system call table */ + int sy_narg; /* number of arguments */ + sy_call_t *sy_call; /* implementing function */ + au_event_t sy_auevent; /* audit event associated with syscall */ + systrace_args_func_t sy_systrace_args_func; + /* optional argument conversion function. */ + u_int32_t sy_entry; /* DTrace entry ID for systrace. */ + u_int32_t sy_return; /* DTrace return ID for systrace. */ + u_int32_t sy_flags; /* General flags for system calls. */ + u_int32_t sy_thrcnt; +}; + +/* + * A system call is permitted in capability mode. + */ +#define SYF_CAPENABLED 0x00000001 + +#define SY_THR_FLAGMASK 0x7 +#define SY_THR_STATIC 0x1 +#define SY_THR_DRAINING 0x2 +#define SY_THR_ABSENT 0x4 +#define SY_THR_INCR 0x8 + +#ifdef KLD_MODULE +#define SY_THR_STATIC_KLD 0 +#else +#define SY_THR_STATIC_KLD SY_THR_STATIC +#endif + +struct image_params; +struct __sigset; +struct trapframe; +struct vnode; + +struct sysentvec { + int sv_size; /* number of entries */ + struct sysent *sv_table; /* pointer to sysent */ + u_int sv_mask; /* optional mask to index */ + int sv_errsize; /* size of errno translation table */ + const int *sv_errtbl; /* errno translation table */ + int (*sv_transtrap)(int, int); + /* translate trap-to-signal mapping */ + int (*sv_fixup)(register_t **, struct image_params *); + /* stack fixup function */ + void (*sv_sendsig)(void (*)(int), struct ksiginfo *, struct __sigset *); + /* send signal */ + char *sv_sigcode; /* start of sigtramp code */ + int *sv_szsigcode; /* size of sigtramp code */ + char *sv_name; /* name of binary type */ + int (*sv_coredump)(struct thread *, struct vnode *, off_t, int); + /* function to dump core, or NULL */ + int (*sv_imgact_try)(struct image_params *); + void (*sv_stackgap)(struct image_params *, u_long *); + int sv_minsigstksz; /* minimum signal stack size */ + int sv_pagesize; /* spare / no longer used */ + vm_offset_t sv_minuser; /* VM_MIN_ADDRESS */ + vm_offset_t sv_maxuser; /* VM_MAXUSER_ADDRESS */ + vm_offset_t sv_usrstack; /* USRSTACK */ + vm_offset_t sv_psstrings; /* PS_STRINGS */ + int sv_stackprot; /* vm protection for stack */ + register_t *(*sv_copyout_strings)(struct image_params *); + void (*sv_setregs)(struct thread *, struct image_params *, + u_long); + void (*sv_fixlimit)(struct rlimit *, int); + u_long *sv_maxssiz; + u_int sv_flags; + void (*sv_set_syscall_retval)(struct thread *, int); + int (*sv_fetch_syscall_args)(struct thread *); + const char **sv_syscallnames; + vm_offset_t sv_timekeep_base; + vm_offset_t sv_shared_page_base; + vm_offset_t sv_shared_page_len; + vm_offset_t sv_sigcode_base; + void *sv_shared_page_obj; + void (*sv_schedtail)(struct thread *); + void (*sv_thread_detach)(struct thread *); + int (*sv_trap)(struct thread *); + u_long *sv_hwcap; /* Value passed in AT_HWCAP. */ + u_long *sv_hwcap2; /* Value passed in AT_HWCAP2. */ +}; + +#define SV_ILP32 0x000100 /* 32-bit executable. */ +#define SV_LP64 0x000200 /* 64-bit executable. */ +#define SV_IA32 0x004000 /* Intel 32-bit executable. */ +#define SV_AOUT 0x008000 /* a.out executable. */ +#define SV_SHP 0x010000 /* Shared page. */ +#define SV_CAPSICUM 0x020000 /* Force cap_enter() on startup. */ +#define SV_TIMEKEEP 0x040000 /* Shared page timehands. */ +#define SV_ASLR 0x080000 /* ASLR allowed. */ + +#define SV_ABI_MASK 0xff +#define SV_ABI_ERRNO(p, e) ((p)->p_sysent->sv_errsize <= 0 ? e : \ + ((e) >= (p)->p_sysent->sv_errsize ? -1 : (p)->p_sysent->sv_errtbl[e])) +#define SV_PROC_FLAG(p, x) ((p)->p_sysent->sv_flags & (x)) +#define SV_PROC_ABI(p) ((p)->p_sysent->sv_flags & SV_ABI_MASK) +#define SV_CURPROC_FLAG(x) SV_PROC_FLAG(curproc, x) +#define SV_CURPROC_ABI() SV_PROC_ABI(curproc) +/* same as ELFOSABI_XXX, to prevent header pollution */ +#define SV_ABI_LINUX 3 +#define SV_ABI_FREEBSD 9 +#define SV_ABI_CLOUDABI 17 +#define SV_ABI_UNDEF 255 + +#ifdef _KERNEL +extern struct sysentvec aout_sysvec; +extern struct sysent sysent[]; +extern const char *syscallnames[]; + +#if defined(__amd64__) +extern int i386_read_exec; +#endif + +#define NO_SYSCALL (-1) + +struct module; + +struct syscall_module_data { + int (*chainevh)(struct module *, int, void *); /* next handler */ + void *chainarg; /* arg for next event handler */ + int *offset; /* offset into sysent */ + struct sysent *new_sysent; /* new sysent */ + struct sysent old_sysent; /* old sysent */ + int flags; /* flags for syscall_register */ +}; + +/* separate initialization vector so it can be used in a substructure */ +#define SYSENT_INIT_VALS(_syscallname) { \ + .sy_narg = (sizeof(struct _syscallname ## _args ) \ + / sizeof(register_t)), \ + .sy_call = (sy_call_t *)&sys_##_syscallname, \ + .sy_auevent = SYS_AUE_##_syscallname, \ + .sy_systrace_args_func = NULL, \ + .sy_entry = 0, \ + .sy_return = 0, \ + .sy_flags = 0, \ + .sy_thrcnt = 0 \ +} + +#define MAKE_SYSENT(syscallname) \ +static struct sysent syscallname##_sysent = SYSENT_INIT_VALS(syscallname); + +#define MAKE_SYSENT_COMPAT(syscallname) \ +static struct sysent syscallname##_sysent = { \ + (sizeof(struct syscallname ## _args ) \ + / sizeof(register_t)), \ + (sy_call_t *)& syscallname, \ + SYS_AUE_##syscallname \ +} + +#define SYSCALL_MODULE(name, offset, new_sysent, evh, arg) \ +static struct syscall_module_data name##_syscall_mod = { \ + evh, arg, offset, new_sysent, { 0, NULL, AUE_NULL } \ +}; \ + \ +static moduledata_t name##_mod = { \ + "sys/" #name, \ + syscall_module_handler, \ + &name##_syscall_mod \ +}; \ +DECLARE_MODULE(name, name##_mod, SI_SUB_SYSCALLS, SI_ORDER_MIDDLE) + +#define SYSCALL_MODULE_HELPER(syscallname) \ +static int syscallname##_syscall = SYS_##syscallname; \ +MAKE_SYSENT(syscallname); \ +SYSCALL_MODULE(syscallname, \ + & syscallname##_syscall, & syscallname##_sysent, \ + NULL, NULL) + +#define SYSCALL_MODULE_PRESENT(syscallname) \ + (sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmnosys && \ + sysent[SYS_##syscallname].sy_call != (sy_call_t *)lkmressys) + +/* + * Syscall registration helpers with resource allocation handling. + */ +struct syscall_helper_data { + struct sysent new_sysent; + struct sysent old_sysent; + int syscall_no; + int registered; +}; +#define SYSCALL_INIT_HELPER_F(syscallname, flags) { \ + .new_sysent = { \ + .sy_narg = (sizeof(struct syscallname ## _args ) \ + / sizeof(register_t)), \ + .sy_call = (sy_call_t *)& sys_ ## syscallname, \ + .sy_auevent = SYS_AUE_##syscallname, \ + .sy_flags = (flags) \ + }, \ + .syscall_no = SYS_##syscallname \ +} +#define SYSCALL_INIT_HELPER_COMPAT_F(syscallname, flags) { \ + .new_sysent = { \ + .sy_narg = (sizeof(struct syscallname ## _args ) \ + / sizeof(register_t)), \ + .sy_call = (sy_call_t *)& syscallname, \ + .sy_auevent = SYS_AUE_##syscallname, \ + .sy_flags = (flags) \ + }, \ + .syscall_no = SYS_##syscallname \ +} +#define SYSCALL_INIT_HELPER(syscallname) \ + SYSCALL_INIT_HELPER_F(syscallname, 0) +#define SYSCALL_INIT_HELPER_COMPAT(syscallname) \ + SYSCALL_INIT_HELPER_COMPAT_F(syscallname, 0) +#define SYSCALL_INIT_LAST { \ + .syscall_no = NO_SYSCALL \ +} + +int syscall_module_handler(struct module *mod, int what, void *arg); +int syscall_helper_register(struct syscall_helper_data *sd, int flags); +int syscall_helper_unregister(struct syscall_helper_data *sd); +/* Implementation, exposed for COMPAT code */ +int kern_syscall_register(struct sysent *sysents, int *offset, + struct sysent *new_sysent, struct sysent *old_sysent, int flags); +int kern_syscall_deregister(struct sysent *sysents, int offset, + const struct sysent *old_sysent); +int kern_syscall_module_handler(struct sysent *sysents, + struct module *mod, int what, void *arg); +int kern_syscall_helper_register(struct sysent *sysents, + struct syscall_helper_data *sd, int flags); +int kern_syscall_helper_unregister(struct sysent *sysents, + struct syscall_helper_data *sd); + +struct proc; +const char *syscallname(struct proc *p, u_int code); + +/* Special purpose system call functions. */ +struct nosys_args; + +int lkmnosys(struct thread *, struct nosys_args *); +int lkmressys(struct thread *, struct nosys_args *); + +int _syscall_thread_enter(struct thread *td, struct sysent *se); +void _syscall_thread_exit(struct thread *td, struct sysent *se); + +static inline int +syscall_thread_enter(struct thread *td, struct sysent *se) +{ + + if (__predict_true((se->sy_thrcnt & SY_THR_STATIC) != 0)) + return (0); + return (_syscall_thread_enter(td, se)); +} + +static inline void +syscall_thread_exit(struct thread *td, struct sysent *se) +{ + + if (__predict_true((se->sy_thrcnt & SY_THR_STATIC) != 0)) + return; + _syscall_thread_exit(td, se); +} + +int shared_page_alloc(int size, int align); +int shared_page_fill(int size, int align, const void *data); +void shared_page_write(int base, int size, const void *data); +void exec_sysvec_init(void *param); +void exec_inittk(void); + +#define INIT_SYSENTVEC(name, sv) \ + SYSINIT(name, SI_SUB_EXEC, SI_ORDER_ANY, \ + (sysinit_cfunc_t)exec_sysvec_init, sv); + +#endif /* _KERNEL */ + +#endif /* !_SYS_SYSENT_H_ */ |