X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/2d21ac55c334faf3a56e5634905ed6987fc787d4..cc8bc92ae4a8e9f1a1ab61bf83d34ad8150b3405:/osfmk/kern/stack.c?ds=inline diff --git a/osfmk/kern/stack.c b/osfmk/kern/stack.c index 68cdcabc0..18db3f24b 100644 --- a/osfmk/kern/stack.c +++ b/osfmk/kern/stack.c @@ -39,11 +39,13 @@ #include #include #include +#include #include #include #include +#include /* * We allocate stacks from generic kernel VM. @@ -61,7 +63,11 @@ decl_simple_lock_data(static,stack_lock_data) static vm_offset_t stack_free_list; static unsigned int stack_free_count, stack_free_hiwat; /* free list count */ -static unsigned int stack_total, stack_hiwat; /* current total count */ +static unsigned int stack_hiwat; +unsigned int stack_total; /* current total count */ +unsigned long long stack_allocs; /* total count of allocations */ + +static int stack_fake_zone_index = -1; /* index in zone_info array */ static unsigned int stack_free_target; static int stack_free_delta; @@ -70,22 +76,60 @@ static unsigned int stack_new_count; /* total new stack allocations */ static vm_offset_t stack_addr_mask; +unsigned int kernel_stack_pages; +vm_offset_t kernel_stack_size; +vm_offset_t kernel_stack_mask; +vm_offset_t kernel_stack_depth_max; + /* * The next field is at the base of the stack, * so the low end is left unsullied. */ #define stack_next(stack) \ - (*((vm_offset_t *)((stack) + KERNEL_STACK_SIZE) - 1)) + (*((vm_offset_t *)((stack) + kernel_stack_size) - 1)) + +static inline int +log2(vm_offset_t size) +{ + int result; + for (result = 0; size > 0; result++) + size >>= 1; + return result; +} + +static inline vm_offset_t +roundup_pow2(vm_offset_t size) +{ + return 1UL << (log2(size - 1) + 1); +} + +static vm_offset_t stack_alloc_internal(void); +static void stack_free_stack(vm_offset_t); void stack_init(void) { simple_lock_init(&stack_lock_data, 0); - if (KERNEL_STACK_SIZE < round_page(KERNEL_STACK_SIZE)) - panic("stack_init: stack size %d not a multiple of page size %d\n", KERNEL_STACK_SIZE, PAGE_SIZE); + kernel_stack_pages = KERNEL_STACK_SIZE / PAGE_SIZE; + kernel_stack_size = KERNEL_STACK_SIZE; + kernel_stack_mask = -KERNEL_STACK_SIZE; + kernel_stack_depth_max = 0; + + if (PE_parse_boot_argn("kernel_stack_pages", + &kernel_stack_pages, + sizeof (kernel_stack_pages))) { + kernel_stack_size = kernel_stack_pages * PAGE_SIZE; + printf("stack_init: kernel_stack_pages=%d kernel_stack_size=%p\n", + kernel_stack_pages, (void *) kernel_stack_size); + } + + if (kernel_stack_size < round_page(kernel_stack_size)) + panic("stack_init: stack size %p not a multiple of page size %d\n", + (void *) kernel_stack_size, PAGE_SIZE); - stack_addr_mask = KERNEL_STACK_SIZE - 1; + stack_addr_mask = roundup_pow2(kernel_stack_size) - 1; + kernel_stack_mask = ~stack_addr_mask; } /* @@ -94,18 +138,18 @@ stack_init(void) * Allocate a stack for a thread, may * block. */ -void -stack_alloc( - thread_t thread) + +static vm_offset_t +stack_alloc_internal(void) { - vm_offset_t stack; + vm_offset_t stack = 0; spl_t s; - int guard_flags; - - assert(thread->kernel_stack == 0); + int flags = 0; + kern_return_t kr = KERN_SUCCESS; s = splsched(); stack_lock(); + stack_allocs++; stack = stack_free_list; if (stack != 0) { stack_free_list = stack_next(stack); @@ -128,13 +172,15 @@ stack_alloc( * for these. */ - guard_flags = KMA_GUARD_FIRST | KMA_GUARD_LAST; - if (kernel_memory_allocate(kernel_map, &stack, - KERNEL_STACK_SIZE + (2*PAGE_SIZE), + flags = KMA_GUARD_FIRST | KMA_GUARD_LAST | KMA_KSTACK | KMA_KOBJECT; + kr = kernel_memory_allocate(kernel_map, &stack, + kernel_stack_size + (2*PAGE_SIZE), stack_addr_mask, - KMA_KOBJECT | guard_flags) - != KERN_SUCCESS) - panic("stack_alloc: kernel_memory_allocate"); + flags, + VM_KERN_MEMORY_STACK); + if (kr != KERN_SUCCESS) { + panic("stack_alloc: kernel_memory_allocate(size:0x%llx, mask: 0x%llx, flags: 0x%x) failed with %d\n", (uint64_t)(kernel_stack_size + (2*PAGE_SIZE)), (uint64_t)stack_addr_mask, flags, kr); + } /* * The stack address that comes back is the address of the lower @@ -143,8 +189,23 @@ stack_alloc( stack += PAGE_SIZE; } + return stack; +} - machine_stack_attach(thread, stack); +void +stack_alloc( + thread_t thread) +{ + + assert(thread->kernel_stack == 0); + machine_stack_attach(thread, stack_alloc_internal()); +} + +void +stack_handoff(thread_t from, thread_t to) +{ + assert(from == current_thread()); + machine_stack_handoff(from, to); } /* @@ -158,12 +219,30 @@ stack_free( { vm_offset_t stack = machine_stack_detach(thread); +#if KASAN + kasan_unpoison_stack(stack, kernel_stack_size); + kasan_unpoison_fakestack(thread); +#endif + assert(stack); - if (stack != thread->reserved_stack) + if (stack != thread->reserved_stack) { stack_free_stack(stack); + } } void +stack_free_reserved( + thread_t thread) +{ + if (thread->reserved_stack != thread->kernel_stack) { +#if KASAN + kasan_unpoison_stack(thread->reserved_stack, kernel_stack_size); +#endif + stack_free_stack(thread->reserved_stack); + } +} + +static void stack_free_stack( vm_offset_t stack) { @@ -270,12 +349,14 @@ stack_collect(void) * back in stack_alloc(). */ - stack = vm_map_trunc_page(stack); + stack = (vm_offset_t)vm_map_trunc_page( + stack, + VM_MAP_PAGE_MASK(kernel_map)); stack -= PAGE_SIZE; if (vm_map_remove( kernel_map, stack, - stack + KERNEL_STACK_SIZE+(2*PAGE_SIZE), + stack + kernel_stack_size+(2*PAGE_SIZE), VM_MAP_REMOVE_KUNWIRE) != KERN_SUCCESS) panic("stack_collect: vm_map_remove"); @@ -329,14 +410,23 @@ __unused void *arg) } void -stack_fake_zone_info(int *count, vm_size_t *cur_size, vm_size_t *max_size, vm_size_t *elem_size, - vm_size_t *alloc_size, int *collectable, int *exhaustable) +stack_fake_zone_init(int zone_index) +{ + stack_fake_zone_index = zone_index; +} + +void +stack_fake_zone_info(int *count, + vm_size_t *cur_size, vm_size_t *max_size, vm_size_t *elem_size, vm_size_t *alloc_size, + uint64_t *sum_size, int *collectable, int *exhaustable, int *caller_acct) { unsigned int total, hiwat, free; + unsigned long long all; spl_t s; s = splsched(); stack_lock(); + all = stack_allocs; total = stack_total; hiwat = stack_hiwat; free = stack_free_count; @@ -344,12 +434,15 @@ stack_fake_zone_info(int *count, vm_size_t *cur_size, vm_size_t *max_size, vm_si splx(s); *count = total - free; - *cur_size = KERNEL_STACK_SIZE * total; - *max_size = KERNEL_STACK_SIZE * hiwat; - *elem_size = KERNEL_STACK_SIZE; - *alloc_size = KERNEL_STACK_SIZE; + *cur_size = kernel_stack_size * total; + *max_size = kernel_stack_size * hiwat; + *elem_size = kernel_stack_size; + *alloc_size = kernel_stack_size; + *sum_size = all * kernel_stack_size; + *collectable = 1; *exhaustable = 0; + *caller_acct = 1; } /* OBSOLETE */ @@ -382,8 +475,8 @@ processor_set_stack_usage( vm_size_t maxusage; vm_offset_t maxstack; - register thread_t *thread_list; - register thread_t thread; + thread_t *thread_list; + thread_t thread; unsigned int actual; /* this many things */ unsigned int i; @@ -398,7 +491,7 @@ processor_set_stack_usage( addr = NULL; for (;;) { - mutex_lock(&tasks_threads_lock); + lck_mtx_lock(&tasks_threads_lock); actual = threads_count; @@ -408,7 +501,7 @@ processor_set_stack_usage( if (size_needed <= size) break; - mutex_unlock(&tasks_threads_lock); + lck_mtx_unlock(&tasks_threads_lock); if (size != 0) kfree(addr, size); @@ -423,15 +516,15 @@ processor_set_stack_usage( /* OK, have memory and list is locked */ thread_list = (thread_t *) addr; - for (i = 0, thread = (thread_t) queue_first(&threads); + for (i = 0, thread = (thread_t)(void *) queue_first(&threads); !queue_end(&threads, (queue_entry_t) thread); - thread = (thread_t) queue_next(&thread->threads)) { + thread = (thread_t)(void *) queue_next(&thread->threads)) { thread_reference_internal(thread); thread_list[i++] = thread; } assert(i <= actual); - mutex_unlock(&tasks_threads_lock); + lck_mtx_unlock(&tasks_threads_lock); /* calculate maxusage and free thread references */ @@ -451,7 +544,7 @@ processor_set_stack_usage( kfree(addr, size); *totalp = total; - *residentp = *spacep = total * round_page(KERNEL_STACK_SIZE); + *residentp = *spacep = total * round_page(kernel_stack_size); *maxusagep = maxusage; *maxstackp = maxstack; return KERN_SUCCESS; @@ -461,10 +554,10 @@ processor_set_stack_usage( vm_offset_t min_valid_stack_address(void) { - return vm_map_min(kernel_map); + return (vm_offset_t)vm_map_min(kernel_map); } vm_offset_t max_valid_stack_address(void) { - return vm_map_max(kernel_map); + return (vm_offset_t)vm_map_max(kernel_map); }