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authorEric Andersen <andersen@codepoet.org>2001-04-23 17:43:54 +0000
committerEric Andersen <andersen@codepoet.org>2001-04-23 17:43:54 +0000
commit66f269d2a51dae6a2cb10f1a9ae4aaeba815219b (patch)
treee2094832990caf6d849ba90e4b1a82a6264f86b3 /ldso/util/readelf2.c
parentc4a3f3f81ea90e3df93c352ac0e2161a4bfd3327 (diff)
Initial checkin for ld.so. This is a combination of effort from Manuel Novoa
III and me. I've been working on stripping out arch dependant stuff and replacing it with generic stuff whenever possible. -Erik
Diffstat (limited to 'ldso/util/readelf2.c')
-rw-r--r--ldso/util/readelf2.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/ldso/util/readelf2.c b/ldso/util/readelf2.c
new file mode 100644
index 000000000..1bf47b7c6
--- /dev/null
+++ b/ldso/util/readelf2.c
@@ -0,0 +1,115 @@
+char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)
+{
+ ElfW(Ehdr) *epnt;
+ ElfW(Phdr) *ppnt;
+ int i, j;
+ char *header;
+ ElfW(Word) dynamic_addr = 0;
+ ElfW(Word) dynamic_size = 0;
+ unsigned long page_size = getpagesize();
+ ElfW(Word) strtab_val = 0;
+ ElfW(Word) needed_val;
+ ElfW(Sword) loadaddr = -1;
+ ElfW(Dyn) *dpnt;
+ struct stat st;
+ char *needed;
+ char *soname = NULL;
+ int multi_libcs = 0;
+
+ if(expected_type == LIB_DLL)
+ {
+ warn("%s does not match type specified for directory!", name);
+ expected_type = LIB_ANY;
+ }
+
+ *type = LIB_ELF;
+
+ if (fstat(fileno(infile), &st))
+ return NULL;
+ header = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(infile), 0);
+ if (header == (caddr_t)-1)
+ return NULL;
+
+ epnt = (ElfW(Ehdr) *)header;
+ if ((char *)(epnt+1) > (char *)(header + st.st_size))
+ goto skip;
+
+ ppnt = (ElfW(Phdr) *)&header[epnt->e_phoff];
+ if ((char *)ppnt < (char *)header ||
+ (char *)(ppnt+epnt->e_phnum) > (char *)(header + st.st_size))
+ goto skip;
+
+ for(i = 0; i < epnt->e_phnum; i++)
+ {
+ if (loadaddr == -1 && ppnt->p_type == PT_LOAD)
+ loadaddr = (ppnt->p_vaddr & ~(page_size-1)) -
+ (ppnt->p_offset & ~(page_size-1));
+ if(ppnt->p_type == 2)
+ {
+ dynamic_addr = ppnt->p_offset;
+ dynamic_size = ppnt->p_filesz;
+ };
+ ppnt++;
+ };
+
+ dpnt = (ElfW(Dyn) *) &header[dynamic_addr];
+ dynamic_size = dynamic_size / sizeof(ElfW(Dyn));
+ if ((char *)dpnt < (char *)header ||
+ (char *)(dpnt+dynamic_size) > (char *)(header + st.st_size))
+ goto skip;
+
+ while (dpnt->d_tag != DT_NULL)
+ {
+ if (dpnt->d_tag == DT_STRTAB)
+ strtab_val = dpnt->d_un.d_val;
+ dpnt++;
+ };
+
+ if (!strtab_val)
+ goto skip;
+
+ dpnt = (ElfW(Dyn) *) &header[dynamic_addr];
+ while (dpnt->d_tag != DT_NULL)
+ {
+ if (dpnt->d_tag == DT_SONAME || dpnt->d_tag == DT_NEEDED)
+ {
+ needed_val = dpnt->d_un.d_val;
+ if (needed_val + strtab_val - loadaddr >= 0 ||
+ needed_val + strtab_val - loadaddr < st.st_size)
+ {
+ needed = (char *) (header - loadaddr + strtab_val + needed_val);
+
+ if (dpnt->d_tag == DT_SONAME)
+ soname = xstrdup(needed);
+
+ for (j = 0; needed_tab[j].soname != NULL; j++)
+ {
+ if (strcmp(needed, needed_tab[j].soname) == 0)
+ {
+ if (*type != LIB_ELF && *type != needed_tab[j].type)
+ multi_libcs = 1;
+ *type = needed_tab[j].type;
+ }
+ }
+ }
+ }
+ dpnt++;
+ };
+
+ if (multi_libcs)
+ warn("%s appears to be for multiple libc's", name);
+
+ /* If we could not deduce the libc type, and we know what to expect, set the type */
+ if(*type == LIB_ELF && expected_type != LIB_ANY) *type = expected_type;
+
+ if(expected_type != LIB_ANY && expected_type != LIB_ELF &&
+ expected_type != *type)
+ {
+ warn("%s does not match type specified for directory!", name);
+ }
+
+ skip:
+ munmap(header, st.st_size);
+
+ return soname;
+}