mirror of
https://github.com/golang/go
synced 2024-10-05 04:21:22 -06:00
e4492ce3c3
Fixes #1511 again. R=golang-dev, iant CC=golang-dev https://golang.org/cl/4527070
87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
#include "runtime.h"
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#include "defs.h"
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#include "os.h"
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#include "malloc.h"
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void*
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runtime·SysAlloc(uintptr n)
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{
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void *p;
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mstats.sys += n;
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p = runtime·mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(p < (void*)4096) {
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if(p == (void*)EACCES) {
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runtime·printf("runtime: mmap: access denied\n");
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runtime·printf("if you're running SELinux, enable execmem for this process.\n");
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runtime·exit(2);
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}
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return nil;
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}
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return p;
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}
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void
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runtime·SysUnused(void *v, uintptr n)
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{
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USED(v);
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USED(n);
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// TODO(rsc): call madvise MADV_DONTNEED
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}
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void
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runtime·SysFree(void *v, uintptr n)
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{
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mstats.sys -= n;
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runtime·munmap(v, n);
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}
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void*
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runtime·SysReserve(void *v, uintptr n)
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{
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void *p;
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// On 64-bit, people with ulimit -v set complain if we reserve too
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// much address space. Instead, assume that the reservation is okay
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// and check the assumption in SysMap.
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if(sizeof(void*) == 8)
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return v;
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p = runtime·mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(p < (void*)4096) {
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return nil;
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}
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return p;
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}
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enum
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{
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ENOMEM = 12,
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};
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void
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runtime·SysMap(void *v, uintptr n)
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{
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void *p;
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mstats.sys += n;
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// On 64-bit, we don't actually have v reserved, so tread carefully.
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if(sizeof(void*) == 8) {
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p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
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if(p == (void*)ENOMEM)
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runtime·throw("runtime: out of memory");
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if(p != v) {
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runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p);
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runtime·throw("runtime: address space conflict");
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}
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return;
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}
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p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, -1, 0);
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if(p == (void*)ENOMEM)
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runtime·throw("runtime: out of memory");
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if(p != v)
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runtime·throw("runtime: cannot map pages in arena address space");
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}
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