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Avoid mapping above 4gb on Windows 7 x64 (#19)

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Windows 7 support is now confirmed to be working. However it comes at
the cost of needing to workaround this tragically oppressive behavior
which is imposed for reasons unknown.

Fixes #19
This commit is contained in:
Justine Tunney 2021-01-16 19:18:37 -08:00
parent f0600a898c
commit 2ad0d05d31
4 changed files with 25 additions and 6 deletions
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19
libc/runtime/memtrack.h
View file

@ -1,13 +1,26 @@
#ifndef COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_
#define COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_
#include "libc/dce.h"
#include "libc/macros.h"
#include "libc/nt/enum/version.h"
#include "libc/nt/struct/teb.h"
#include "libc/runtime/runtime.h"
#if !(__ASSEMBLER__ + __LINKER__ + 0)
COSMOPOLITAN_C_START_
#define kAutomapStart 0x0000100080000000 // asan can't spread its poison here
#define kAutomapSize 0x00000fff80000000
#define kFixedmapStart 0x0000200000000000
#define _kAutomapStart 0x0000100080000000 // asan can't spread its poison here
#define _kAutomapSize 0x00000fff80000000
#define _kFixedmapStart 0x0000200000000000
/*
* TODO: Why can't we allocate addresses above 4GB on Windows 7 x64?
* https://github.com/jart/cosmopolitan/issues/19
*/
#define MEMTRACK_ADDRESS(NORMAL, WIN7) \
(!(IsWindows() && NtGetVersion() < kNtVersionWindows10) ? NORMAL : WIN7)
#define kAutomapStart MEMTRACK_ADDRESS(_kAutomapStart, 0x10000000)
#define kAutomapSize MEMTRACK_ADDRESS(_kAutomapSize, 0x40000000)
#define kFixedmapStart MEMTRACK_ADDRESS(_kFixedmapStart, 0x40000000)
struct MemoryIntervals {
int i;