diff options
Diffstat (limited to 'gcc-4.8.1/libgo/runtime/mem.c')
| -rw-r--r-- | gcc-4.8.1/libgo/runtime/mem.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/gcc-4.8.1/libgo/runtime/mem.c b/gcc-4.8.1/libgo/runtime/mem.c deleted file mode 100644 index e606bdd4d..000000000 --- a/gcc-4.8.1/libgo/runtime/mem.c +++ /dev/null @@ -1,185 +0,0 @@ -/* Defining _XOPEN_SOURCE hides the declaration of madvise() on Solaris < - 11 and the MADV_DONTNEED definition on IRIX 6.5. */ -#undef _XOPEN_SOURCE - -#include <errno.h> -#include <unistd.h> - -#include "runtime.h" -#include "arch.h" -#include "malloc.h" - -#ifndef MAP_ANON -#ifdef MAP_ANONYMOUS -#define MAP_ANON MAP_ANONYMOUS -#else -#define USE_DEV_ZERO -#define MAP_ANON 0 -#endif -#endif - -#ifndef MAP_NORESERVE -#define MAP_NORESERVE 0 -#endif - -#ifdef USE_DEV_ZERO -static int dev_zero = -1; -#endif - -static _Bool -addrspace_free(void *v __attribute__ ((unused)), uintptr n __attribute__ ((unused))) -{ -#ifdef HAVE_MINCORE - size_t page_size = getpagesize(); - size_t off; - char one_byte; - - errno = 0; - for(off = 0; off < n; off += page_size) - if(mincore((char *)v + off, page_size, (void *)&one_byte) != -1 - || errno != ENOMEM) - return 0; -#endif - return 1; -} - -static void * -mmap_fixed(byte *v, uintptr n, int32 prot, int32 flags, int32 fd, uint32 offset) -{ - void *p; - - p = runtime_mmap((void *)v, n, prot, flags, fd, offset); - if(p != v && addrspace_free(v, n)) { - // On some systems, mmap ignores v without - // MAP_FIXED, so retry if the address space is free. - if(p != MAP_FAILED) - runtime_munmap(p, n); - p = runtime_mmap((void *)v, n, prot, flags|MAP_FIXED, fd, offset); - } - return p; -} - -void* -runtime_SysAlloc(uintptr n) -{ - void *p; - int fd = -1; - - mstats.sys += n; - -#ifdef USE_DEV_ZERO - if (dev_zero == -1) { - dev_zero = open("/dev/zero", O_RDONLY); - if (dev_zero < 0) { - runtime_printf("open /dev/zero: errno=%d\n", errno); - exit(2); - } - } - fd = dev_zero; -#endif - - p = runtime_mmap(nil, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, fd, 0); - if (p == MAP_FAILED) { - if(errno == EACCES) { - runtime_printf("runtime: mmap: access denied\n"); - runtime_printf("if you're running SELinux, enable execmem for this process.\n"); - exit(2); - } - if(errno == EAGAIN) { - runtime_printf("runtime: mmap: too much locked memory (check 'ulimit -l').\n"); - runtime_exit(2); - } - return nil; - } - return p; -} - -void -runtime_SysUnused(void *v __attribute__ ((unused)), uintptr n __attribute__ ((unused))) -{ -#ifdef MADV_DONTNEED - runtime_madvise(v, n, MADV_DONTNEED); -#endif -} - -void -runtime_SysFree(void *v, uintptr n) -{ - mstats.sys -= n; - runtime_munmap(v, n); -} - -void* -runtime_SysReserve(void *v, uintptr n) -{ - int fd = -1; - void *p; - -#ifdef USE_DEV_ZERO - if (dev_zero == -1) { - dev_zero = open("/dev/zero", O_RDONLY); - if (dev_zero < 0) { - runtime_printf("open /dev/zero: errno=%d\n", errno); - exit(2); - } - } - fd = dev_zero; -#endif - - // On 64-bit, people with ulimit -v set complain if we reserve too - // much address space. Instead, assume that the reservation is okay - // if we can reserve at least 64K and check the assumption in SysMap. - // Only user-mode Linux (UML) rejects these requests. - if(sizeof(void*) == 8 && (uintptr)v >= 0xffffffffU) { - p = mmap_fixed(v, 64<<10, PROT_NONE, MAP_ANON|MAP_PRIVATE, fd, 0); - if (p != v) - return nil; - runtime_munmap(p, 64<<10); - return v; - } - - // Use the MAP_NORESERVE mmap() flag here because typically most of - // this reservation will never be used. It does not make sense - // reserve a huge amount of unneeded swap space. This is important on - // systems which do not overcommit memory by default. - p = runtime_mmap(v, n, PROT_NONE, MAP_ANON|MAP_PRIVATE|MAP_NORESERVE, fd, 0); - if(p == MAP_FAILED) - return nil; - return p; -} - -void -runtime_SysMap(void *v, uintptr n) -{ - void *p; - int fd = -1; - - mstats.sys += n; - -#ifdef USE_DEV_ZERO - if (dev_zero == -1) { - dev_zero = open("/dev/zero", O_RDONLY); - if (dev_zero < 0) { - runtime_printf("open /dev/zero: errno=%d\n", errno); - exit(2); - } - } - fd = dev_zero; -#endif - - // On 64-bit, we don't actually have v reserved, so tread carefully. - if(sizeof(void*) == 8 && (uintptr)v >= 0xffffffffU) { - p = mmap_fixed(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, fd, 0); - if(p == MAP_FAILED && errno == ENOMEM) - runtime_throw("runtime: out of memory"); - if(p != v) { - runtime_printf("runtime: address space conflict: map(%p) = %p\n", v, p); - runtime_throw("runtime: address space conflict"); - } - return; - } - - p = runtime_mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_FIXED|MAP_PRIVATE, fd, 0); - if(p != v) - runtime_throw("runtime: cannot map pages in arena address space"); -} |