diff options
Diffstat (limited to 'ldso/include')
| -rw-r--r-- | ldso/include/dl-defs.h | 66 | ||||
| -rw-r--r-- | ldso/include/dl-elf.h | 9 | ||||
| -rw-r--r-- | ldso/include/dl-hash.h | 4 | ||||
| -rw-r--r-- | ldso/include/ldso.h | 2 |
4 files changed, 75 insertions, 6 deletions
diff --git a/ldso/include/dl-defs.h b/ldso/include/dl-defs.h index 878ebc3b8..dc6531d19 100644 --- a/ldso/include/dl-defs.h +++ b/ldso/include/dl-defs.h @@ -66,4 +66,70 @@ typedef struct { #endif +/* Machines in which different sections may be relocated by different + amounts should define this and LD_RELOC_ADDR. If you change this, + make sure you change struct link_map in include/link.h accordingly + such that it matches a prefix of struct elf_resolve. */ +#ifndef DL_LOADADDR_TYPE +# define DL_LOADADDR_TYPE ElfW(Addr) +#endif + +/* When DL_LOADADDR_TYPE is not a scalar value, or some different + computation is needed to relocate an address, define this. */ +#ifndef DL_RELOC_ADDR +# define DL_RELOC_ADDR(ADDR, LOADADDR) \ + ((void*)((intptr_t)(ADDR) + (intptr_t)(LOADADDR))) +#endif + +/* Define if any declarations/definitions of local variables are + needed in a function that calls DT_INIT_LOADADDR or + DL_INIT_LOADADDR_HDR. Declarations must be properly terminated + with a semicolon, and non-declaration statements are forbidden. */ +#ifndef DL_INIT_LOADADDR_EXTRA_DECLS +# define DL_INIT_LOADADDR_EXTRA_DECLS /* int i; */ +#endif + +/* Prepare a DL_LOADADDR_TYPE data structure for incremental + initialization with DL_INIT_LOADADDR_HDR, given pointers to a base + load address and to program headers. */ +#ifndef DL_INIT_LOADADDR +# define DL_INIT_LOADADDR(LOADADDR, BASEADDR, PHDR, PHDRCNT) \ + ((LOADADDR) = (BASEADDR)) +#endif + +/* Convert a DL_LOADADDR_TYPE to an identifying pointer. Used mostly + for debugging. */ +#ifndef DL_LOADADDR_BASE +# define DL_LOADADDR_BASE(LOADADDR) (LOADADDR) +#endif + +/* Initialize a LOADADDR representing the loader itself. It's only + called from DL_BOOT, so additional arguments passed to it may be + referenced. */ +#ifndef DL_INIT_LOADADDR_BOOT +# define DL_INIT_LOADADDR_BOOT(LOADADDR, BASEADDR) \ + ((LOADADDR) = (BASEADDR)) +#endif + +/* Initialize a LOADADDR representing the program. It's called from + DL_BOOT only. */ +#ifndef DL_INIT_LOADADDR_PROG +# define DL_INIT_LOADADDR_PROG(LOADADDR, BASEADDR) \ + ((LOADADDR) = (BASEADDR)) +#endif + +/* Test whether a given ADDR is more likely to be within the memory + region mapped to TPNT (a struct elf_resolve *) than to TFROM. + Everywhere that this is used, TFROM is initially NULL, and whenever + a potential match is found, it's updated. One might want to walk + the chain of elf_resolve to locate the best match and return false + whenever TFROM is non-NULL, or use an exact-matching algorithm + using additional information encoded in DL_LOADADDR_TYPE to test + for exact containment. */ +#ifndef DL_ADDR_IN_LOADADDR +# define DL_ADDR_IN_LOADADDR(ADDR, TPNT, TFROM) \ + ((void*)(TPNT)->loadaddr < (void*)(ADDR) \ + && (! (TFROM) || (TFROM)->loadaddr < (TPNT)->loadaddr)) +#endif + #endif /* _LD_DEFS_H */ diff --git a/ldso/include/dl-elf.h b/ldso/include/dl-elf.h index de404aec1..9e364d680 100644 --- a/ldso/include/dl-elf.h +++ b/ldso/include/dl-elf.h @@ -94,10 +94,12 @@ extern void _dl_protect_relro (struct elf_resolve *l); #define DYNAMIC_SIZE (DT_NUM+OS_NUM+ARCH_NUM) -extern void _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, ElfW(Addr) load_off); +extern void _dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, + DL_LOADADDR_TYPE load_off); static __always_inline -void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, ElfW(Addr) load_off) +void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void *debug_addr, + DL_LOADADDR_TYPE load_off) { for (; dpnt->d_tag; dpnt++) { if (dpnt->d_tag < DT_NUM) { @@ -139,7 +141,8 @@ void __dl_parse_dynamic_info(ElfW(Dyn) *dpnt, unsigned long dynamic_info[], void #define ADJUST_DYN_INFO(tag, load_off) \ do { \ if (dynamic_info[tag]) \ - dynamic_info[tag] += load_off; \ + dynamic_info[tag] = (unsigned long)DL_RELOC_ADDR (dynamic_info[tag], \ + load_off); \ } while(0) ADJUST_DYN_INFO(DT_HASH, load_off); ADJUST_DYN_INFO(DT_PLTGOT, load_off); diff --git a/ldso/include/dl-hash.h b/ldso/include/dl-hash.h index b12b36f3b..26fb334fe 100644 --- a/ldso/include/dl-hash.h +++ b/ldso/include/dl-hash.h @@ -28,7 +28,7 @@ struct dyn_elf{ struct elf_resolve{ /* These entries must be in this order to be compatible with the interface used by gdb to obtain the list of symbols. */ - ElfW(Addr) loadaddr; /* Base address shared object is loaded at. */ + DL_LOADADDR_TYPE loadaddr; /* Base address shared object is loaded at. */ char *libname; /* Absolute file name object was found in. */ ElfW(Dyn) *dynamic_addr; /* Dynamic section of the shared object. */ struct elf_resolve * next; @@ -77,7 +77,7 @@ extern struct elf_resolve * _dl_loaded_modules; extern struct dyn_elf * _dl_handles; extern struct elf_resolve * _dl_add_elf_hash_table(const char * libname, - char * loadaddr, unsigned long * dynamic_info, + DL_LOADADDR_TYPE loadaddr, unsigned long * dynamic_info, unsigned long dynamic_addr, unsigned long dynamic_size); extern char * _dl_find_hash(const char * name, struct dyn_elf * rpnt1, diff --git a/ldso/include/ldso.h b/ldso/include/ldso.h index 0a3f70691..573652e61 100644 --- a/ldso/include/ldso.h +++ b/ldso/include/ldso.h @@ -88,7 +88,7 @@ extern void _dl_unsetenv(const char *symbol, char **envp); extern char *_dl_strdup(const char *string); extern void _dl_dprintf(int, const char *, ...); -extern void _dl_get_ready_to_run(struct elf_resolve *tpnt, unsigned long load_addr, +extern void _dl_get_ready_to_run(struct elf_resolve *tpnt, DL_LOADADDR_TYPE load_addr, ElfW(auxv_t) auxvt[AT_EGID + 1], char **envp, char **argv); #endif /* _LDSO_H_ */ |