1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
40  * Traditional sbrk/grow interface to VM
57 #include <vm/vm.h>
58 #include <vm/vm_param.h>
59 #include <vm/pmap.h>
60 #include <vm/vm_map.h>
74 	addr = (uintptr_t)uap->nsize;  in sys_break()
77 		td->td_retval[0] = addr;  in sys_break()
87 	struct vmspace *vm = td->td_proc->p_vmspace;  in kern_break()  local
88 	vm_map_t map = &vm->vm_map;  in kern_break()  local
99 	vm_map_lock(map);  in kern_break()
101 	base = round_page((vm_offset_t) vm->vm_daddr);  in kern_break()
102 	old = base + ctob(vm->vm_dsize);  in kern_break()
108 		if (new - base > datalim && new > old) {  in kern_break()
112 		if (new > vm_map_max(map)) {  in kern_break()
119 		 * modifying any state.  This is an ad-hoc interface  in kern_break()
129 		if (!old_mlock && map->flags & MAP_WIREFUTURE) {  in kern_break()
130 			if (ptoa(pmap_wired_count(map->pmap)) +  in kern_break()
131 			    (new - old) > lmemlim) {  in kern_break()
136 		if (map->size + (new - old) > vmemlim) {  in kern_break()
142 			PROC_LOCK(td->td_proc);  in kern_break()
143 			error = racct_set(td->td_proc, RACCT_DATA, new - base);  in kern_break()
145 				PROC_UNLOCK(td->td_proc);  in kern_break()
149 			error = racct_set(td->td_proc, RACCT_VMEM,  in kern_break()
150 			    map->size + (new - old));  in kern_break()
152 				racct_set_force(td->td_proc, RACCT_DATA,  in kern_break()
153 				    old - base);  in kern_break()
154 				PROC_UNLOCK(td->td_proc);  in kern_break()
158 			if (!old_mlock && map->flags & MAP_WIREFUTURE) {  in kern_break()
159 				error = racct_set(td->td_proc, RACCT_MEMLOCK,  in kern_break()
160 				    ptoa(pmap_wired_count(map->pmap)) +  in kern_break()
161 				    (new - old));  in kern_break()
163 					racct_set_force(td->td_proc, RACCT_DATA,  in kern_break()
164 					    old - base);  in kern_break()
165 					racct_set_force(td->td_proc, RACCT_VMEM,  in kern_break()
166 					    map->size);  in kern_break()
167 					PROC_UNLOCK(td->td_proc);  in kern_break()
172 			PROC_UNLOCK(td->td_proc);  in kern_break()
177 		if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))  in kern_break()
180 		rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL,  in kern_break()
182 		if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE) != 0) {  in kern_break()
183 			rv = vm_map_wire_locked(map, old, new,  in kern_break()
186 				(void)vm_map_delete(map, old, new);  in kern_break()
191 				PROC_LOCK(td->td_proc);  in kern_break()
192 				racct_set_force(td->td_proc,  in kern_break()
193 				    RACCT_DATA, old - base);  in kern_break()
194 				racct_set_force(td->td_proc,  in kern_break()
195 				    RACCT_VMEM, map->size);  in kern_break()
196 				if (!old_mlock && map->flags & MAP_WIREFUTURE) {  in kern_break()
197 					racct_set_force(td->td_proc,  in kern_break()
199 					    ptoa(pmap_wired_count(map->pmap)));  in kern_break()
201 				PROC_UNLOCK(td->td_proc);  in kern_break()
207 		vm->vm_dsize += btoc(new - old);  in kern_break()
209 		rv = vm_map_delete(map, new, old);  in kern_break()
214 		vm->vm_dsize -= btoc(old - new);  in kern_break()
217 			PROC_LOCK(td->td_proc);  in kern_break()
218 			racct_set_force(td->td_proc, RACCT_DATA, new - base);  in kern_break()
219 			racct_set_force(td->td_proc, RACCT_VMEM, map->size);  in kern_break()
220 			if (!old_mlock && map->flags & MAP_WIREFUTURE) {  in kern_break()
221 				racct_set_force(td->td_proc, RACCT_MEMLOCK,  in kern_break()
222 				    ptoa(pmap_wired_count(map->pmap)));  in kern_break()
224 			PROC_UNLOCK(td->td_proc);  in kern_break()
229 	vm_map_unlock(map);  in kern_break()