vasilito
a2f047712e
Portable ELF code (Mesa util/build_id.c, unwinders) uses ElfW(Nhdr) etc. and expects <link.h> to define ElfW -> Elf64_type (LP64) / Elf32_type. Without it those TUs fall back to an undefined Elf_##type and fail to compile.
60 lines
2.1 KiB
C
60 lines
2.1 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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/*
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* glibc-compatible `ElfW(type)` macro: expands to the native-word-size ELF type
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* (Elf64_type on LP64, Elf32_type otherwise). Portable ELF code (Mesa's
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* util/build_id.c, unwinders) uses `ElfW(Nhdr)` etc. and expects <link.h> to
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* provide this.
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*/
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#ifndef ElfW
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# if defined(__LP64__) || defined(_LP64) || (__SIZEOF_POINTER__ == 8)
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# define ElfW(type) Elf64_##type
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# else
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# define ElfW(type) Elf32_##type
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# endif
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#endif
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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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