OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [runtime/] [mem.c] - Blame information for rev 801

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 747 jeremybenn 
/* Defining _XOPEN_SOURCE hides the declaration of madvise() on Solaris <
2 
   11 and the MADV_DONTNEED definition on IRIX 6.5.  */
3 
#undef _XOPEN_SOURCE
4 
 
5 
#include <errno.h>
6 
#include <unistd.h>
7 
 
8 
#include "runtime.h"
9 
#include "arch.h"
10 
#include "malloc.h"
11 
 
12 
#ifndef MAP_ANON
13 
#ifdef MAP_ANONYMOUS
14 
#define MAP_ANON MAP_ANONYMOUS
15 
#else
16 
#define USE_DEV_ZERO
17 
#define MAP_ANON 0
18 
#endif
19 
#endif
20 
 
21 
#ifdef USE_DEV_ZERO
22 
static int dev_zero = -1;
23 
#endif
24 
 
25 
static _Bool
26 
addrspace_free(void *v __attribute__ ((unused)), uintptr n __attribute__ ((unused)))
27 
{
28 
#ifdef HAVE_MINCORE
29 
        size_t page_size = getpagesize();
30 
        size_t off;
31 
        char one_byte;
32 
 
33 
        errno = 0;
34 
        for(off = 0; off < n; off += page_size)
35 
                if(mincore((char *)v + off, page_size, (void *)&one_byte) != -1
36 
                   || errno != ENOMEM)
37 
                        return 0;
38 
#endif
39 
        return 1;
40 
}
41 
 
42 
void*
43 
runtime_SysAlloc(uintptr n)
44 
{
45 
        void *p;
46 
        int fd = -1;
47 
 
48 
        mstats.sys += n;
49 
 
50 
#ifdef USE_DEV_ZERO
51 
        if (dev_zero == -1) {
52 
                dev_zero = open("/dev/zero", O_RDONLY);
53 
                if (dev_zero < 0) {
54 
                        runtime_printf("open /dev/zero: errno=%d\n", errno);
55 
                        exit(2);
56 
                }
57 
        }
58 
        fd = dev_zero;
59 
#endif
60 
 
61 
        p = runtime_mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, fd, 0);
62 
        if (p == MAP_FAILED) {
63 
                if(errno == EACCES) {
64 
                        runtime_printf("runtime: mmap: access denied\n");
65 
                        runtime_printf("if you're running SELinux, enable execmem for this process.\n");
66 
                        exit(2);
67 
                }
68 
                return nil;
69 
        }
70 
        return p;
71 
}
72 
 
73 
void
74 
runtime_SysUnused(void *v __attribute__ ((unused)), uintptr n __attribute__ ((unused)))
75 
{
76 
#ifdef MADV_DONTNEED
77 
        runtime_madvise(v, n, MADV_DONTNEED);
78 
#endif
79 
}
80 
 
81 
void
82 
runtime_SysFree(void *v, uintptr n)
83 
{
84 
        mstats.sys -= n;
85 
        runtime_munmap(v, n);
86 
}
87 
 
88 
void*
89 
runtime_SysReserve(void *v, uintptr n)
90 
{
91 
        int fd = -1;
92 
        void *p;
93 
 
94 
        // On 64-bit, people with ulimit -v set complain if we reserve too
95 
        // much address space.  Instead, assume that the reservation is okay
96 
        // and check the assumption in SysMap.
97 
        if(sizeof(void*) == 8)
98 
                return v;
99 
 
100 
#ifdef USE_DEV_ZERO
101 
        if (dev_zero == -1) {
102 
                dev_zero = open("/dev/zero", O_RDONLY);
103 
                if (dev_zero < 0) {
104 
                        runtime_printf("open /dev/zero: errno=%d\n", errno);
105 
                        exit(2);
106 
                }
107 
        }
108 
        fd = dev_zero;
109 
#endif
110 
 
111 
        p = runtime_mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE, fd, 0);
112 
        if((uintptr)p < 4096 || -(uintptr)p < 4096) {
113 
                return nil;
114 
        }
115 
        return p;
116 
}
117 
 
118 
void
119 
runtime_SysMap(void *v, uintptr n)
120 
{
121 
        void *p;
122 
        int fd = -1;
123 
 
124 
        mstats.sys += n;
125 
 
126 
#ifdef USE_DEV_ZERO
127 
        if (dev_zero == -1) {
128 
                dev_zero = open("/dev/zero", O_RDONLY);
129 
                if (dev_zero < 0) {
130 
                        runtime_printf("open /dev/zero: errno=%d\n", errno);
131 
                        exit(2);
132 
                }
133 
        }
134 
        fd = dev_zero;
135 
#endif
136 
 
137 
        // On 64-bit, we don't actually have v reserved, so tread carefully.
138 
        if(sizeof(void*) == 8) {
139 
                p = runtime_mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, fd, 0);
140 
                if(p != v && addrspace_free(v, n)) {
141 
                        // On some systems, mmap ignores v without
142 
                        // MAP_FIXED, so retry if the address space is free.
143 
                        p = runtime_mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, fd, 0);
144 
                }
145 
                if(p != v) {
146 
                        runtime_printf("runtime: address space conflict: map(%p) = %p\n", v, p);
147 
                        runtime_throw("runtime: address space conflict");
148 
                }
149 
                return;
150 
        }
151 
 
152 
        p = runtime_mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, fd, 0);
153 
        if(p != v)
154 
                runtime_throw("runtime: cannot map pages in arena address space");
155 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.