diff options
Diffstat (limited to 'sys/kern/kern_exec.c')
| -rw-r--r-- | sys/kern/kern_exec.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c index d9baab6..80502e3 100644 --- a/sys/kern/kern_exec.c +++ b/sys/kern/kern_exec.c @@ -28,6 +28,7 @@ __FBSDID("$FreeBSD$"); #include "opt_capsicum.h" +#include "opt_compat.h" #include "opt_hwpmc_hooks.h" #include "opt_kdtrace.h" #include "opt_ktrace.h" @@ -64,6 +65,7 @@ __FBSDID("$FreeBSD$"); #include <sys/sysent.h> #include <sys/shm.h> #include <sys/sysctl.h> +#include <sys/vdso.h> #include <sys/vnode.h> #include <sys/stat.h> #ifdef KTRACE @@ -1608,10 +1610,76 @@ shared_page_init(void *dummy __unused) SYSINIT(shp, SI_SUB_EXEC, SI_ORDER_FIRST, (sysinit_cfunc_t)shared_page_init, NULL); +static void +timehands_update(void *arg) +{ + struct sysentvec *sv; + struct sf_buf *sf; + struct vdso_timehands th; + struct vdso_timekeep *tk; + uint32_t enabled, idx; + + sv = arg; + sx_xlock(&shared_page_alloc_sx); + enabled = tc_fill_vdso_timehands(&th); + sf = shared_page_write_start(sv->sv_timekeep_off); + tk = (void *)(sf_buf_kva(sf) + (sv->sv_timekeep_off & PAGE_MASK)); + idx = sv->sv_timekeep_curr; + atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0); + if (++idx >= VDSO_TH_NUM) + idx = 0; + sv->sv_timekeep_curr = idx; + if (++sv->sv_timekeep_gen == 0) + sv->sv_timekeep_gen = 1; + th.th_gen = 0; + if (enabled) + tk->tk_th[idx] = th; + tk->tk_enabled = enabled; + atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen); + tk->tk_current = idx; + shared_page_write_end(sf); + sx_xunlock(&shared_page_alloc_sx); +} + +#ifdef COMPAT_FREEBSD32 +static void +timehands_update32(void *arg) +{ + struct sysentvec *sv; + struct sf_buf *sf; + struct vdso_timekeep32 *tk; + struct vdso_timehands32 th; + uint32_t enabled, idx; + + sv = arg; + sx_xlock(&shared_page_alloc_sx); + enabled = tc_fill_vdso_timehands32(&th); + sf = shared_page_write_start(sv->sv_timekeep_off); + tk = (void *)(sf_buf_kva(sf) + (sv->sv_timekeep_off & PAGE_MASK)); + idx = sv->sv_timekeep_curr; + atomic_store_rel_32(&tk->tk_th[idx].th_gen, 0); + if (++idx >= VDSO_TH_NUM) + idx = 0; + sv->sv_timekeep_curr = idx; + if (++sv->sv_timekeep_gen == 0) + sv->sv_timekeep_gen = 1; + th.th_gen = 0; + if (enabled) + tk->tk_th[idx] = th; + tk->tk_enabled = enabled; + atomic_store_rel_32(&tk->tk_th[idx].th_gen, sv->sv_timekeep_gen); + tk->tk_current = idx; + shared_page_write_end(sf); + sx_xunlock(&shared_page_alloc_sx); +} +#endif + void exec_sysvec_init(void *param) { struct sysentvec *sv; + int tk_base; + uint32_t tk_ver; sv = (struct sysentvec *)param; @@ -1620,4 +1688,29 @@ exec_sysvec_init(void *param) sv->sv_shared_page_obj = shared_page_obj; sv->sv_sigcode_base = sv->sv_shared_page_base + shared_page_fill(*(sv->sv_szsigcode), 16, sv->sv_sigcode); + tk_ver = VDSO_TK_VER_CURR; +#ifdef COMPAT_FREEBSD32 + if ((sv->sv_flags & SV_ILP32) != 0) { + tk_base = shared_page_alloc(sizeof(struct vdso_timekeep32) + + sizeof(struct vdso_timehands32) * VDSO_TH_NUM, 16); + KASSERT(tk_base != -1, ("tk_base -1 for 32bit")); + EVENTHANDLER_REGISTER(tc_windup, timehands_update32, sv, + EVENTHANDLER_PRI_ANY); + shared_page_write(tk_base + offsetof(struct vdso_timekeep32, + tk_ver), sizeof(uint32_t), &tk_ver); + } else { +#endif + tk_base = shared_page_alloc(sizeof(struct vdso_timekeep) + + sizeof(struct vdso_timehands) * VDSO_TH_NUM, 16); + KASSERT(tk_base != -1, ("tk_base -1 for native")); + EVENTHANDLER_REGISTER(tc_windup, timehands_update, sv, + EVENTHANDLER_PRI_ANY); + shared_page_write(tk_base + offsetof(struct vdso_timekeep, + tk_ver), sizeof(uint32_t), &tk_ver); +#ifdef COMPAT_FREEBSD32 + } +#endif + sv->sv_timekeep_base = sv->sv_shared_page_base + tk_base; + sv->sv_timekeep_off = tk_base; + EVENTHANDLER_INVOKE(tc_windup); } |
