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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
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
150 changed files with 1893 additions and 5634 deletions
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10
libc/log/backtrace.internal.h
View file

@ -1,19 +1,9 @@
#ifndef COSMOPOLITAN_LIBC_LOG_BACKTRACE_H_
#define COSMOPOLITAN_LIBC_LOG_BACKTRACE_H_
#include "libc/nexgen32e/stackframe.h"
#include "libc/runtime/memtrack.internal.h"
#include "libc/runtime/symbols.internal.h"
COSMOPOLITAN_C_START_
forceinline pureconst bool IsValidStackFramePointer(struct StackFrame *x) {
/* assumes __mmi_lock() is held */
return IsLegalPointer(x) && !((uintptr_t)x & 15) &&
(IsStaticStackFrame((uintptr_t)x >> 16) ||
IsOldStackFrame((uintptr_t)x >> 16) ||
/* lua coroutines need this */
IsMemtracked((uintptr_t)x >> 16, (uintptr_t)x >> 16));
}
void ShowBacktrace(int, const struct StackFrame *);
int PrintBacktraceUsingSymbols(int, const struct StackFrame *,
struct SymbolTable *);

1
libc/log/leaks.c
View file

@ -126,7 +126,6 @@ dontasan void CheckForMemoryLeaks(void) {
malloc_inspect_all(OnMemory, 0);
kprintf("\n");
/* __print_maps(); */
/* PrintSystemMappings(2); */
/* PrintGarbage(); */
_Exit(78);
}

5
libc/log/oncrash_amd64.c
View file

@ -245,7 +245,6 @@ static relegated void ShowCrashReport(int err, int sig, siginfo_t *si,
if (!IsWindows()) {
__print_maps();
}
/* PrintSystemMappings(2); */
if (__argv) {
for (i = 0; i < __argc; ++i) {
kprintf("%s ", __argv[i]);
@ -269,6 +268,8 @@ static inline void SpinUnlock(atomic_uint *lock) {
relegated void __oncrash(int sig, siginfo_t *si, void *arg) {
static atomic_uint lock;
ftrace_enabled(-1);
strace_enabled(-1);
BLOCK_CANCELATION;
SpinLock(&lock);
int err = errno;
@ -291,6 +292,8 @@ relegated void __oncrash(int sig, siginfo_t *si, void *arg) {
SpinUnlock(&lock);
ALLOW_CANCELATION;
strace_enabled(+1);
ftrace_enabled(+1);
}
#endif /* __x86_64__ */

7
libc/log/oncrash_arm64.c
View file

@ -33,6 +33,7 @@
#include "libc/calls/ucontext.h"
#include "libc/cosmo.h"
#include "libc/cxxabi.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/describebacktrace.internal.h"
@ -211,8 +212,6 @@ static relegated void __oncrash_impl(int sig, siginfo_t *si, ucontext_t *ctx) {
struct utsname names = {0};
struct Buffer b[1] = {{buf, size}};
b->p[b->i++] = '\n';
ftrace_enabled(-1);
strace_enabled(-1);
__restore_tty();
uname(&names);
gethostname(host, sizeof(host));
@ -390,6 +389,8 @@ static inline void SpinUnlock(atomic_uint *lock) {
relegated void __oncrash(int sig, siginfo_t *si, void *arg) {
static atomic_uint lock;
ftrace_enabled(-1);
strace_enabled(-1);
BLOCK_CANCELATION;
SpinLock(&lock);
__oncrash_impl(sig, si, arg);
@ -416,6 +417,8 @@ relegated void __oncrash(int sig, siginfo_t *si, void *arg) {
SpinUnlock(&lock);
ALLOW_CANCELATION;
strace_enabled(+1);
ftrace_enabled(+1);
}
#endif /* __aarch64__ */