diff options
Diffstat (limited to 'src/cmd/ld/elf.c')
| -rw-r--r-- | src/cmd/ld/elf.c | 135 |
1 files changed, 117 insertions, 18 deletions
diff --git a/src/cmd/ld/elf.c b/src/cmd/ld/elf.c index b0cce4985d..fc917b203b 100644 --- a/src/cmd/ld/elf.c +++ b/src/cmd/ld/elf.c @@ -331,17 +331,62 @@ elfinterp(ElfShdr *sh, uint64 startva, char *p) } extern int nelfsym; +int elfverneed; + +typedef struct Elfaux Elfaux; +typedef struct Elflib Elflib; + +struct Elflib +{ + Elflib *next; + Elfaux *aux; + char *file; +}; + +struct Elfaux +{ + Elfaux *next; + int num; + char *vers; +}; + +Elfaux* +addelflib(Elflib **list, char *file, char *vers) +{ + Elflib *lib; + Elfaux *aux; + + for(lib=*list; lib; lib=lib->next) + if(strcmp(lib->file, file) == 0) + goto havelib; + lib = mal(sizeof *lib); + lib->next = *list; + lib->file = file; + *list = lib; +havelib: + for(aux=lib->aux; aux; aux=aux->next) + if(strcmp(aux->vers, vers) == 0) + goto haveaux; + aux = mal(sizeof *aux); + aux->next = lib->aux; + aux->vers = vers; + lib->aux = aux; +haveaux: + return aux; +} void elfdynhash(void) { - Sym *s, *sy; - int i, nbucket, b; - uchar *pc; - uint32 hc, g; - uint32 *chain, *buckets; + Sym *s, *sy, *dynstr; + int i, j, nbucket, b, nfile; + uint32 hc, *chain, *buckets; int nsym; char *name; + Elfaux **need; + Elflib *needlib; + Elflib *l; + Elfaux *x; if(!iself) return; @@ -358,29 +403,29 @@ elfdynhash(void) i >>= 1; } - chain = malloc(nsym * sizeof(uint32)); - buckets = malloc(nbucket * sizeof(uint32)); - if(chain == nil || buckets == nil) { + needlib = nil; + need = malloc(nsym * sizeof need[0]); + chain = malloc(nsym * sizeof chain[0]); + buckets = malloc(nbucket * sizeof buckets[0]); + if(need == nil || chain == nil || buckets == nil) { cursym = nil; diag("out of memory"); errorexit(); } - memset(chain, 0, nsym * sizeof(uint32)); - memset(buckets, 0, nbucket * sizeof(uint32)); + memset(need, 0, nsym * sizeof need[0]); + memset(chain, 0, nsym * sizeof chain[0]); + memset(buckets, 0, nbucket * sizeof buckets[0]); for(sy=allsym; sy!=S; sy=sy->allsym) { if (sy->dynid <= 0) continue; - hc = 0; + if(sy->dynimpvers) + need[sy->dynid] = addelflib(&needlib, sy->dynimplib, sy->dynimpvers); + name = sy->dynimpname; if(name == nil) name = sy->name; - for(pc = (uchar*)name; *pc; pc++) { - hc = (hc<<4) + *pc; - g = hc & 0xf0000000; - hc ^= g >> 24; - hc &= ~g; - } + hc = elfhash((uchar*)name); b = hc % nbucket; chain[sy->dynid] = buckets[b]; @@ -396,8 +441,62 @@ elfdynhash(void) free(chain); free(buckets); + + // version symbols + dynstr = lookup(".dynstr", 0); + s = lookup(".gnu.version_r", 0); + i = 2; + nfile = 0; + for(l=needlib; l; l=l->next) { + nfile++; + // header + adduint16(s, 1); // table version + j = 0; + for(x=l->aux; x; x=x->next) + j++; + adduint16(s, j); // aux count + adduint32(s, addstring(dynstr, l->file)); // file string offset + adduint32(s, 16); // offset from header to first aux + if(l->next) + adduint32(s, 16+j*16); // offset from this header to next + else + adduint32(s, 0); + + for(x=l->aux; x; x=x->next) { + x->num = i++; + // aux struct + adduint32(s, elfhash((uchar*)x->vers)); // hash + adduint16(s, 0); // flags + adduint16(s, x->num); // other - index we refer to this by + adduint32(s, addstring(dynstr, x->vers)); // version string offset + if(x->next) + adduint32(s, 16); // offset from this aux to next + else + adduint32(s, 0); + } + } + + // version references + s = lookup(".gnu.version", 0); + for(i=0; i<nsym; i++) { + if(i == 0) + adduint16(s, 0); // first entry - no symbol + else if(need[i] == nil) + adduint16(s, 1); // global + else + adduint16(s, need[i]->num); + } - elfwritedynent(lookup(".dynamic", 0), DT_NULL, 0); + free(need); + + s = lookup(".dynamic", 0); + elfverneed = nfile; + if(elfverneed) { + elfwritedynentsym(s, DT_VERNEED, lookup(".gnu.version_r", 0)); + elfwritedynent(s, DT_VERNEEDNUM, nfile); + elfwritedynentsym(s, DT_VERSYM, lookup(".gnu.version", 0)); + } + elfwritedynent(s, DT_NULL, 0); } ElfPhdr* |