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Reduce code size of mandatory runtime

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This change reduces o/tiny/examples/life from 44kb to 24kb in size since
it avoids linking mmap() when unnecessary. This is important, to helping
cosmo not completely lose touch with its roots.
This commit is contained in:
Justine Tunney 2024-07-04 02:50:20 -07:00
parent fdab49b30e
commit 15ea0524b3
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GPG key ID: BE714B4575D6E328
17 changed files with 164 additions and 163 deletions
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36
libc/intrin/maps.c
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@ -31,35 +31,51 @@ __static_yoink("_init_maps");
struct Maps __maps;
void __maps_add(struct Map *map) {
dll_init(&map->elem);
dll_make_first(&__maps.used, &map->elem);
map->next = __maps.maps;
__maps.maps = map;
++__maps.count;
}
static void __maps_adder(struct Map *map, int pagesz) {
__maps.pages += ((map->size + pagesz - 1) & -pagesz) / pagesz;
__maps_add(map);
}
void __maps_stack(void *stackaddr, int pagesz, size_t stacksize, int stackprot,
intptr_t stackhand) {
__maps.stack.addr = stackaddr;
__maps.stack.size = stacksize;
__maps.stack.prot = stackprot;
__maps.stack.h = stackhand;
__maps_adder(&__maps.stack, pagesz);
}
void __maps_init(void) {
int pagesz = getauxval(AT_PAGESZ);
// record _start() stack mapping
if (!IsWindows()) {
struct AddrSize stack;
stack = __get_main_stack();
dll_init(&__maps.stack.elem);
__maps.stack.addr = stack.addr;
__maps.stack.size = stack.size;
__maps.stack.prot = (uintptr_t)ape_stack_prot;
__maps_insert(&__maps.stack);
__maps_stack(stack.addr, pagesz, stack.size, (uintptr_t)ape_stack_prot, 0);
}
// record .text and .data mappings
static struct Map text, data;
dll_init(&text.elem);
text.addr = (char *)__executable_start;
text.size = _etext - __executable_start;
text.prot = PROT_READ | PROT_EXEC;
int pagesz = getauxval(AT_PAGESZ);
uintptr_t ds = ((uintptr_t)_etext + pagesz - 1) & -pagesz;
if (ds < (uintptr_t)_end) {
dll_init(&data.elem);
data.addr = (char *)ds;
data.size = (uintptr_t)_end - ds;
data.prot = PROT_READ | PROT_WRITE;
__maps_insert(&data);
__maps_adder(&data, pagesz);
}
__maps_insert(&text);
__maps_adder(&text, pagesz);
}
privileged void __maps_lock(void) {