vasilito
991d05ce2f
Mesa's Intel Anvil Vulkan driver requires dl_iterate_phdr, which relibc lacked (meson cc.has_function fails). Implement it against the dynamic linker's authoritative object list: store each object's program headers on the DSO (new DSO.phdrs, populated in both from_raw and new), add Linker::iter_dsos, and add a src/header/link module exporting dl_iterate_phdr that walks the loaded objects and reports each one's base/name/phdr-table to the callback (stopping early on non-zero return, per spec). Static binaries (no linker) report zero objects. Hand-written include/link.h declares struct dl_phdr_info with a correctly-typed const Elf64_Phdr* dlpi_phdr.
46 lines
1.6 KiB
C
46 lines
1.6 KiB
C
/*
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* link.h — dynamic-linker introspection (dl_iterate_phdr).
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*
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* Non-POSIX (glibc/BSD extension). The implementation of dl_iterate_phdr lives
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* in relibc's dynamic linker (src/header/link/mod.rs); this header only
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* declares the ABI. Keep `struct dl_phdr_info` in sync with the Rust
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* `DlPhdrInfo` struct in that module.
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*/
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#ifndef _RELIBC_LINK_H
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#define _RELIBC_LINK_H
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#include <elf.h>
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#include <stddef.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct dl_phdr_info {
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Elf64_Addr dlpi_addr; /* base / load bias of the object */
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const char *dlpi_name; /* object pathname (NUL-terminated) */
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const Elf64_Phdr *dlpi_phdr; /* pointer to the program header array */
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Elf64_Half dlpi_phnum; /* number of program headers */
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/* glibc-compatible extension fields */
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unsigned long long dlpi_adds; /* # objects added since process start */
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unsigned long long dlpi_subs; /* # objects removed since start */
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size_t dlpi_tls_modid; /* TLS module ID (0 if none) */
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void *dlpi_tls_data; /* TLS block for the calling thread */
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};
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/*
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* Call `callback` once per loaded object. `size` is sizeof(struct dl_phdr_info).
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* Iteration stops as soon as a callback returns non-zero, and that value is
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* returned; otherwise the return value is that of the last callback (or 0 when
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* there are no objects).
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*/
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int dl_iterate_phdr(int (*callback)(struct dl_phdr_info *info,
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size_t size, void *data),
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void *data);
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* _RELIBC_LINK_H */
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