6433ec22b1
Linker --wrap option resolves to __wrap_symbol for undefined symbol. During the compilation of host libportable.a, __HOST__ is defined to rename all portable functions to __wrap_symbol, and the real function to __real_symbol. This way libportable.a can be validated at host w/o changes of user's source code. See http://sourceware.org/binutils/docs/ld/Options.html Change-Id: Idcbe53dd642536f3dc2be85a875f95535b9dc0b1
130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*
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* Copyright 2012, The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <portability.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <mman_portable.h>
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#if MAP_ANONYMOUS_PORTABLE==MAP_ANONYMOUS
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#error Bad build environment
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#endif
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#define PORTABLE_TAG "mmap_portable"
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#include <log_portable.h>
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static inline int mmap_prot_pton(int portable_prot)
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{
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int native_prot = portable_prot;
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ALOGV("%s(portable_prot:0x%x) {", __func__, portable_prot);
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/* Only PROT_SEM is different */
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if (portable_prot & PROT_SEM_PORTABLE) {
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native_prot &= ~PROT_SEM_PORTABLE;
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native_prot |= PROT_SEM;
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}
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ALOGV("%s: return(native_prot:0x%x); }", __func__, native_prot);
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return native_prot;
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}
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static inline int mmap_flags_pton(int portable_flags)
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{
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int native_flags = 0;
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ALOGV("%s(portable_flags:0x%x) {", __func__, portable_flags);
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if (portable_flags & MAP_SHARED_PORTABLE) {
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native_flags |= MAP_SHARED;
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}
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if (portable_flags & MAP_PRIVATE_PORTABLE) {
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native_flags |= MAP_PRIVATE;
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}
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if (portable_flags & MAP_FIXED_PORTABLE) {
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native_flags |= MAP_FIXED;
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}
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if (portable_flags & MAP_ANONYMOUS_PORTABLE) {
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native_flags |= MAP_ANONYMOUS;
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}
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if (portable_flags & MAP_GROWSDOWN_PORTABLE) {
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native_flags |= MAP_GROWSDOWN;
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}
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if (portable_flags & MAP_DENYWRITE_PORTABLE) {
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native_flags |= MAP_DENYWRITE;
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}
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if (portable_flags & MAP_EXECUTABLE_PORTABLE) {
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native_flags |= MAP_EXECUTABLE;
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}
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if (portable_flags & MAP_LOCKED_PORTABLE) {
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native_flags |= MAP_LOCKED;
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}
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if (portable_flags & MAP_NORESERVE_PORTABLE) {
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native_flags |= MAP_NORESERVE;
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}
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if (portable_flags & MAP_POPULATE_PORTABLE) {
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native_flags |= MAP_POPULATE;
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}
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if (portable_flags & MAP_NONBLOCK_PORTABLE) {
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native_flags |= MAP_NONBLOCK;
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}
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ALOGV("%s: return(native_flags:0x%x); }", __func__, native_flags);
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return native_flags;
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}
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extern void* REAL(mmap)(void *, size_t, int, int, int, off_t);
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void *WRAP(mmap)(void *addr, size_t size, int prot, int flags, int fd, long byte_offset)
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{
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int native_prot, native_flags;
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int saved_errno;
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void *ret_addr;
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ALOGV(" ");
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ALOGV("%s(addr:%p, size:%d, prot:0x%x, flags:0x%x, fd:%d, byte_offset:0x%lx) {", __func__,
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addr, size, prot, flags, fd, byte_offset);
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native_prot = mmap_prot_pton(prot);
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native_flags = mmap_flags_pton(flags);
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ret_addr = REAL(mmap)(addr, size, native_prot, native_flags, fd, byte_offset);
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ALOGV("%s: return(ret_addr:%p); }", __func__, ret_addr);
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return ret_addr;
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}
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extern int mprotect(const void *, size_t, int);
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int WRAP(mprotect)(const void *addr, size_t size, int portable_prot)
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{
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int rv;
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int native_prot;
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ALOGV(" ");
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ALOGV("%s(addr:%p, size:%d, portable_prot:0x%x); {", __func__,
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addr, size, portable_prot);
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native_prot = mmap_prot_pton(portable_prot);
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rv = REAL(mprotect)(addr, size, native_prot);
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ALOGV("%s: return(rv:%d); }", __func__, rv);
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return rv;
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}
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