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add OpenBSD MAP_STACK for coroutines (#14353)

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This commit is contained in:
John
2020-05-16 12:56:52 -07:00
committed by GitHub
parent 7f377da1d2
commit 40ac19572a
1 changed files with 10 additions and 4 deletions
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14
lib/system/osalloc.nim
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@@ -196,7 +196,13 @@ elif defined(posix) and not defined(StandaloneHeapSize):
PROT_READ = 1 # page can be read
PROT_WRITE = 2 # page can be written
when defined(macosx) or defined(bsd):
when defined(netbsd) or defined(openbsd):
# OpenBSD security for setjmp/longjmp coroutines
var MAP_STACK {.importc: "MAP_STACK", header: "<sys/mman.h>".}: cint
else:
const MAP_STACK = 0 # avoid sideeffects
when defined(macosx) or defined(freebsd):
const MAP_ANONYMOUS = 0x1000
const MAP_PRIVATE = 0x02 # Changes are private
elif defined(solaris):
@@ -210,7 +216,7 @@ elif defined(posix) and not defined(StandaloneHeapSize):
elif defined(haiku):
const MAP_ANONYMOUS = 0x08
const MAP_PRIVATE = 0x02
else:
else: # posix including netbsd or openbsd
var
MAP_ANONYMOUS {.importc: "MAP_ANONYMOUS", header: "<sys/mman.h>".}: cint
MAP_PRIVATE {.importc: "MAP_PRIVATE", header: "<sys/mman.h>".}: cint
@@ -222,13 +228,13 @@ elif defined(posix) and not defined(StandaloneHeapSize):
proc osAllocPages(size: int): pointer {.inline.} =
result = mmap(nil, cast[csize_t](size), PROT_READ or PROT_WRITE,
MAP_PRIVATE or MAP_ANONYMOUS, -1, 0)
MAP_ANONYMOUS or MAP_PRIVATE or MAP_STACK, -1, 0)
if result == nil or result == cast[pointer](-1):
raiseOutOfMem()
proc osTryAllocPages(size: int): pointer {.inline.} =
result = mmap(nil, cast[csize_t](size), PROT_READ or PROT_WRITE,
MAP_PRIVATE or MAP_ANONYMOUS, -1, 0)
MAP_ANONYMOUS or MAP_PRIVATE or MAP_STACK, -1, 0)
if result == cast[pointer](-1): result = nil
proc osDeallocPages(p: pointer, size: int) {.inline.} =