src/pkg/runtime/plan9/mem.c - Issue 2273041: code review 2273041: Initial Plan9 runtime support for 386.

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Side by Side Diff: src/pkg/runtime/plan9/mem.c

Issue 2273041: code review 2273041: Initial Plan9 runtime support for 386. (Closed)

Patch Set: code review 2273041: Initial Plan9 runtime support for 386. Created 15 years, 1 month ago

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1 // Copyright 2010 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 #include "runtime.h"
6 #include "malloc.h"
7
8 extern int8 end[];
9 static int8 *bloc = { end };
10
11 enum
12 {
13 Round = 7
14 };
15
16 void*
17 SysAlloc(uintptr ask)
18 {
19 uintptr bl;
20 ········
21 // Plan 9 sbrk from /sys/src/libc/9sys/sbrk.c
22 bl = ((uintptr)bloc + Round) & ~Round;
23 if(brk_((void*)(bl + ask)) < 0)
24 return (void*)-1;
25 bloc = (int8*)bl + ask;
26 return (void*)bl;
27 }
28
29 void
30 SysFree(void *v, uintptr n)
31 {
32 // from tiny/mem.c
33 // Push pointer back if this is a free
34 // of the most recent SysAlloc.
35 n += (n + Round) & ~Round;
36 if(bloc == (int8*)v+n)
37 bloc -= n;······
38 }
39
40 void
41 SysUnused(void *v, uintptr n)
42 {
43 USED(v, n);
44 }
45
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