mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-01 16:58:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Rewrite brk() and sbrk()

Browse source 
This change reduces the .bss memory requirement for all executables by
O(64kb). The brk system calls are now fully tested and figured out and
might be useful for tiny programs that only target System Five.
This commit is contained in:
Justine Tunney 2022-10-01 23:11:56 -07:00
parent bc8532688b
commit 5005f2e446
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
23 changed files with 643 additions and 294 deletions
Download patch file Download diff file Expand all files Collapse all files

12
libc/intrin/kprintf.greg.c
View file

@ -43,6 +43,7 @@
#include "libc/nt/runtime.h"
#include "libc/nt/thunk/msabi.h"
#include "libc/nt/winsock.h"
#include "libc/runtime/brk.internal.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/runtime/runtime.h"
@ -103,8 +104,17 @@ privileged static inline bool kistextpointer(const void *p) {
return _base <= (const unsigned char *)p && (const unsigned char *)p < _etext;
}
privileged static inline unsigned char *kend(void) {
unsigned char *p;
if (_weaken(__brk) && (p = _weaken(__brk)->p)) {
return p;
} else {
return _end;
}
}
privileged static inline bool kisimagepointer(const void *p) {
return _base <= (const unsigned char *)p && (const unsigned char *)p < _end;
return _base <= (const unsigned char *)p && (const unsigned char *)p < kend();
}
privileged static inline bool kischarmisaligned(const char *p, signed char t) {