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Kernel+LibELF: Support initializing values of TLS data

Previously, TLS data was always zero-initialized.

To support initializing the values of TLS data, sys$allocate_tls now
receives a buffer with the desired initial data, and copies it to the
master TLS region of the process.

The DynamicLinker gathers the initial TLS image and passes it to
sys$allocate_tls.

We also now require the size passed to sys$allocate_tls to be
page-aligned, to make things easier. Note that this doesn't waste memory
as the TLS data has to be allocated in separate pages anyway.
This commit is contained in:
Itamar 2021-04-24 11:30:20 +03:00 committed by Andreas Kling
parent db76702d71
commit 6bbd2ebf83
7 changed files with 63 additions and 12 deletions

View file

@ -73,9 +73,9 @@ int madvise(void* address, size_t size, int advice)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
void* allocate_tls(size_t size)
void* allocate_tls(const char* initial_data, size_t size)
{
ptrdiff_t rc = syscall(SC_allocate_tls, size);
ptrdiff_t rc = syscall(SC_allocate_tls, initial_data, size);
if (rc < 0 && -rc < EMAXERRNO) {
errno = -rc;
return MAP_FAILED;

View file

@ -40,6 +40,6 @@ int munmap(void*, size_t);
int mprotect(void*, size_t, int prot);
int set_mmap_name(void*, size_t, const char*);
int madvise(void*, size_t, int advice);
void* allocate_tls(size_t);
void* allocate_tls(const char* initial_data, size_t);
__END_DECLS