7d6689055f
This patch adds the mprotect() syscall to allow changing the protection flags for memory regions. We don't do any region splitting/merging yet, so this only works on whole mmap() regions. Added a "crash -r" flag to verify that we crash when you attempt to write to read-only memory. :^)
59 lines
1.4 KiB
C++
59 lines
1.4 KiB
C++
#include <Kernel/Syscall.h>
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#include <errno.h>
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#include <mman.h>
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#include <stdio.h>
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extern "C" {
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void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset)
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{
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Syscall::SC_mmap_params params { (u32)addr, size, prot, flags, fd, offset, nullptr };
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int rc = syscall(SC_mmap, ¶ms);
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if (rc < 0 && -rc < EMAXERRNO) {
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errno = -rc;
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return (void*)-1;
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}
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return (void*)rc;
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}
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void* mmap_with_name(void* addr, size_t size, int prot, int flags, int fd, off_t offset, const char* name)
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{
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Syscall::SC_mmap_params params { (u32)addr, size, prot, flags, fd, offset, name };
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int rc = syscall(SC_mmap, ¶ms);
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if (rc < 0 && -rc < EMAXERRNO) {
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errno = -rc;
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return (void*)-1;
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}
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return (void*)rc;
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}
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int munmap(void* addr, size_t size)
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{
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int rc = syscall(SC_munmap, addr, size);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int mprotect(void* addr, size_t size, int prot)
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{
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int rc = syscall(SC_mprotect, addr, size, prot);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int set_mmap_name(void* addr, size_t size, const char* name)
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{
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int rc = syscall(SC_set_mmap_name, addr, size, name);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int shm_open(const char* name, int flags, mode_t mode)
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{
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int rc = syscall(SC_shm_open, name, flags, mode);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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int shm_unlink(const char* name)
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{
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int rc = syscall(SC_unlink, name);
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__RETURN_WITH_ERRNO(rc, rc, -1);
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}
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}
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