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Rewrite memory manager

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Actually Portable Executable now supports Android. Cosmo's old mmap code
required a 47 bit address space. The new implementation is very agnostic
and supports both smaller address spaces (e.g. embedded) and even modern
56-bit PML5T paging for x86 which finally came true on Zen4 Threadripper

Cosmopolitan no longer requires UNIX systems to observe the Windows 64kb
granularity; i.e. sysconf(_SC_PAGE_SIZE) will now report the host native
page size. This fixes a longstanding POSIX conformance issue, concerning
file mappings that overlap the end of file. Other aspects of conformance
have been improved too, such as the subtleties of address assignment and
and the various subtleties surrounding MAP_FIXED and MAP_FIXED_NOREPLACE

On Windows, mappings larger than 100 megabytes won't be broken down into
thousands of independent 64kb mappings. Support for MAP_STACK is removed
by this change; please use NewCosmoStack() instead.

Stack overflow avoidance is now being implemented using the POSIX thread
APIs. Please use GetStackBottom() and GetStackAddr(), instead of the old
error-prone GetStackAddr() and HaveStackMemory() APIs which are removed.
This commit is contained in:
Justine Tunney 2024-06-20 20:46:42 -07:00
parent 7f6d0b8709
commit 6ffed14b9c
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GPG key ID: BE714B4575D6E328
150 changed files with 1893 additions and 5634 deletions
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86
libc/intrin/kprintf.greg.c
View file

@ -25,8 +25,11 @@
#include "libc/fmt/magnumstrs.internal.h"
#include "libc/intrin/asmflag.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/dll.h"
#include "libc/intrin/getenv.internal.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/likely.h"
#include "libc/intrin/maps.h"
#include "libc/intrin/nomultics.internal.h"
#include "libc/intrin/weaken.h"
#include "libc/log/internal.h"
@ -45,9 +48,11 @@
#include "libc/runtime/internal.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/runtime/symbols.internal.h"
#include "libc/serialize.h"
#include "libc/stdckdint.h"
#include "libc/stdio/sysparam.h"
#include "libc/str/str.h"
#include "libc/str/tab.internal.h"
#include "libc/str/utf16.h"
@ -117,7 +122,7 @@ __msabi extern typeof(SetLastError) *const __imp_SetLastError;
__msabi extern typeof(WriteFile) *const __imp_WriteFile;
// clang-format on
long __klog_handle;
extern long __klog_handle;
extern struct SymbolTable *__symtab;
__funline char *kadvance(char *p, char *e, long n) {
@ -141,20 +146,6 @@ __funline char *kemitquote(char *p, char *e, signed char t, unsigned c) {
return p;
}
__funline bool kiskernelpointer(const void *p) {
return 0x7f0000000000 <= (intptr_t)p && (intptr_t)p < 0x800000000000;
}
__funline bool kistextpointer(const void *p) {
return __executable_start <= (const unsigned char *)p &&
(const unsigned char *)p < _etext;
}
__funline bool kisimagepointer(const void *p) {
return __executable_start <= (const unsigned char *)p &&
(const unsigned char *)p < _end;
}
__funline bool kischarmisaligned(const char *p, signed char t) {
if (t == -1)
return (intptr_t)p & 1;
@ -163,55 +154,26 @@ __funline bool kischarmisaligned(const char *p, signed char t) {
return false;
}
__funline bool kismemtrackhosed(void) {
return !((_weaken(_mmi)->i <= _weaken(_mmi)->n) &&
(_weaken(_mmi)->p == _weaken(_mmi)->s ||
_weaken(_mmi)->p == (struct MemoryInterval *)kMemtrackStart));
}
privileged static bool kismapped(int x) {
// xxx: we can't lock because no reentrant locks yet
size_t m, r, l = 0;
if (!_weaken(_mmi))
return true;
if (kismemtrackhosed())
return false;
r = _weaken(_mmi)->i;
while (l < r) {
m = (l & r) + ((l ^ r) >> 1); // floor((a+b)/2)
if (_weaken(_mmi)->p[m].y < x) {
l = m + 1;
} else {
r = m;
privileged static bool32 kisdangerous_unlocked(const char *addr) {
struct Dll *e, *e2;
for (e = dll_first(__maps.used); e; e = e2) {
e2 = dll_next(__maps.used, e);
struct Map *map = MAP_CONTAINER(e);
if (map->addr <= addr && addr < map->addr + map->size) {
dll_remove(&__maps.used, e);
dll_make_first(&__maps.used, e);
return !(map->prot & PROT_READ);
}
}
if (l < _weaken(_mmi)->i && x >= _weaken(_mmi)->p[l].x) {
return !!(_weaken(_mmi)->p[l].prot & PROT_READ);
} else {
return false;
}
return true;
}
privileged bool32 kisdangerous(const void *p) {
int frame;
if (kisimagepointer(p))
return false;
if (kiskernelpointer(p))
return false;
if (IsOldStack(p))
return false;
if (IsLegalPointer(p)) {
frame = (uintptr_t)p >> 16;
if (IsStackFrame(frame))
return false;
if (kismapped(frame))
return false;
}
if (GetStackAddr() + GetGuardSize() <= (uintptr_t)p &&
(uintptr_t)p < GetStackAddr() + GetStackSize()) {
return false;
}
return true;
privileged bool32 kisdangerous(const void *addr) {
bool32 res;
__maps_lock();
res = kisdangerous_unlocked(addr);
__maps_unlock();
return res;
}
privileged static void klogclose(long fd) {
@ -463,10 +425,6 @@ privileged static size_t kformat(char *b, size_t n, const char *fmt,
unsigned long long x;
unsigned i, j, m, rem, sign, hash, cols, prec;
char c, *p, *e, pdot, zero, flip, dang, base, quot, uppr, ansi, z[128];
if (kistextpointer(b) || kisdangerous(b))
n = 0;
if (!kistextpointer(fmt))
fmt = "!!WONTFMT";
p = b;
f = fmt;
e = p + n; // assume if n was negative e < p will be the case