mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-05-28 08:12:28 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Reduce code size of mandatory runtime

Browse source 
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
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
17 changed files with 164 additions and 163 deletions
Download patch file Download diff file Expand all files Collapse all files

21
libc/runtime/winmain.greg.c
View file

@ -159,7 +159,7 @@ static bool32 HasEnvironmentVariable(const char16_t *name) {
}
static abi unsigned OnWinCrash(struct NtExceptionPointers *ep) {
int code, sig = __sig_crash_sig(ep, &code);
int code, sig = __sig_crash_sig(ep->ExceptionRecord->ExceptionCode, &code);
TerminateThisProcess(sig);
}
@ -194,28 +194,23 @@ static abi wontreturn void WinInit(const char16_t *cmdline) {
__imp_AddVectoredExceptionHandler(true, (void *)OnWinCrash);
// allocate memory for stack and argument block
intptr_t stackhand;
char *stackaddr = (char *)GetStaticStackAddr(0);
size_t stacksize = GetStaticStackSize();
__imp_MapViewOfFileEx(
(__maps.stack.h = __imp_CreateFileMappingW(
-1, 0, kNtPageExecuteReadwrite, stacksize >> 32, stacksize, NULL)),
(stackhand = __imp_CreateFileMappingW(-1, 0, kNtPageExecuteReadwrite,
stacksize >> 32, stacksize, NULL)),
kNtFileMapWrite | kNtFileMapExecute, 0, 0, stacksize, stackaddr);
int prot = (intptr_t)ape_stack_prot;
if (~prot & PROT_EXEC) {
int stackprot = (intptr_t)ape_stack_prot;
if (~stackprot & PROT_EXEC) {
uint32_t old;
__imp_VirtualProtect(stackaddr, stacksize, kNtPageReadwrite, &old);
}
uint32_t oldattr;
__imp_VirtualProtect(stackaddr, GetGuardSize(),
kNtPageReadwrite | kNtPageGuard, &oldattr);
__maps.stack.addr = stackaddr;
__maps.stack.size = stacksize;
__maps.stack.prot = prot;
__maps.maps = &__maps.stack;
__maps.pages = (stacksize + 4095) / 4096;
__maps.count = 1;
dll_init(&__maps.stack.elem);
dll_make_first(&__maps.used, &__maps.stack.elem);
if (_weaken(__maps_stack))
_weaken(__maps_stack)(stackaddr, 4096, stacksize, stackprot, stackhand);
struct WinArgs *wa =
(struct WinArgs *)(stackaddr + (stacksize - sizeof(struct WinArgs)));