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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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150 changed files with 1893 additions and 5634 deletions
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5
libc/sysv/consts.sh
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@ -219,10 +219,9 @@ syscon mmap MAP_FILE 0 0 0 0 0 0 0 0 # consensus
syscon mmap MAP_SHARED 1 1 1 1 1 1 1 1 # forced consensus & faked nt
syscon mmap MAP_SHARED_VALIDATE 3 3 1 1 1 1 1 1 # weird linux thing
syscon mmap MAP_PRIVATE 2 2 2 2 2 2 2 2 # forced consensus & faked nt
syscon mmap MAP_STACK 6 6 6 6 6 6 6 6 # our definition
syscon mmap MAP_TYPE 15 15 15 15 15 15 15 15 # mask for type of mapping
syscon mmap MAP_FIXED 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 0x00000010 # unix consensus; openbsd appears to forbid; faked nt
syscon mmap MAP_FIXED_NOREPLACE 0x08000000 0x08000000 0x00004010 0x00004010 0x08000000 0x08000000 0x08000000 0x08000000 # handled and defined by cosmo runtime; 0x100000 on linux 4.7+; MAP_FIXED|MAP_EXCL on FreeBSD
syscon mmap MAP_FIXED_NOREPLACE 0x08000000 0x08000000 0x00004000 0x00004000 0x08000000 0x08000000 0x08000000 0x08000000 # handled and defined by cosmo runtime; 0x100000 on linux 4.7+; MAP_FIXED|MAP_EXCL on FreeBSD
syscon mmap MAP_ANONYMOUS 0x00000020 0x00000020 0x00001000 0x00001000 0x00001000 0x00001000 0x00001000 0x00000020 # bsd consensus; faked nt
syscon mmap MAP_GROWSDOWN 0x00000100 0x00000100 0 0 0 0 0 0 # use MAP_STACK; abstracted by MAP_STACK; may be passed to __sys_mmap() for low-level Linux fiddling
syscon mmap MAP_LOCKED 0x00002000 0x00002000 0 0 0 0 0 0
@ -293,8 +292,6 @@ syscon mprot PROT_NONE 0 0 0 0 0 0 0 0 # mmap, mprotect, unix
syscon mprot PROT_READ 1 1 1 1 1 1 1 1 # mmap, mprotect, unix consensus
syscon mprot PROT_WRITE 2 2 2 2 2 2 2 2 # mmap, mprotect, unix consensus
syscon mprot PROT_EXEC 4 4 4 4 4 4 4 4 # mmap, mprotect, unix consensus
syscon mprot PROT_GROWSDOWN 0x01000000 0x01000000 0 0 0 0 0 0 # intended for mprotect; see MAP_GROWSDOWN for mmap() (todo: what was 0x01000000 on nt)
syscon mprot PROT_GROWSUP 0x02000000 0x02000000 0 0 0 0 0 0 # intended for mprotect; see MAP_GROWSDOWN for mmap()
# mremap() flags
# the revolutionary praxis of realloc()