Allow ldconfig.host to build ld.so.cache for target, regardless of

the target system's byteorder

1 files changed, 31 insertions, 1 deletions

diff --git a/utils/readsoname2.c b/utils/readsoname2.c
index 1bf47b7c6..9452c0c4d 100644
--- a/utils/readsoname2.c
+++ b/utils/readsoname2.c
@@ -26,7 +26,7 @@ char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)
 
   if (fstat(fileno(infile), &st))
     return NULL;
-  header = mmap(0, st.st_size, PROT_READ, MAP_SHARED, fileno(infile), 0);
+  header = mmap(0, st.st_size, PROT_READ|PROT_WRITE, MAP_PRIVATE, fileno(infile), 0);
   if (header == (caddr_t)-1)
     return NULL;
 
@@ -34,6 +34,19 @@ char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)
   if ((char *)(epnt+1) > (char *)(header + st.st_size))
     goto skip;
 
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+  byteswap = (epnt->e_ident[5] == ELFDATA2MSB) ? 1 : 0;
+#elif __BYTE_ORDER == __BIG_ENDIAN
+  byteswap = (epnt->e_ident[5] == ELFDATA2LSB) ? 1 : 0;
+#else
+#error Unknown host byte order!
+#endif
+  /* Be very lazy, and only byteswap the stuff we use */
+  if (byteswap==1) {
+    epnt->e_phoff=bswap_32(epnt->e_phoff);
+    epnt->e_phnum=bswap_16(epnt->e_phnum);
+  }
+
   ppnt = (ElfW(Phdr) *)&header[epnt->e_phoff];
   if ((char *)ppnt < (char *)header ||
       (char *)(ppnt+epnt->e_phnum) > (char *)(header + st.st_size))
@@ -41,6 +54,14 @@ char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)
 
   for(i = 0; i < epnt->e_phnum; i++)
   {
+    /* Be very lazy, and only byteswap the stuff we use */
+    if (byteswap==1) {
+      ppnt->p_type=bswap_32(ppnt->p_type);
+      ppnt->p_vaddr=bswap_32(ppnt->p_vaddr);
+      ppnt->p_offset=bswap_32(ppnt->p_offset);
+      ppnt->p_filesz=bswap_32(ppnt->p_filesz);
+    }
+
     if (loadaddr == -1 && ppnt->p_type == PT_LOAD) 
       loadaddr = (ppnt->p_vaddr & ~(page_size-1)) -
 	(ppnt->p_offset & ~(page_size-1));
@@ -58,11 +79,20 @@ char *readsonameXX(char *name, FILE *infile, int expected_type, int *type)
       (char *)(dpnt+dynamic_size) > (char *)(header + st.st_size))
     goto skip;
   
+  if (byteswap==1) {
+    dpnt->d_tag=bswap_32(dpnt->d_tag);
+    dpnt->d_un.d_val=bswap_32(dpnt->d_un.d_val);
+  }
+
   while (dpnt->d_tag != DT_NULL)
   {
     if (dpnt->d_tag == DT_STRTAB)
       strtab_val = dpnt->d_un.d_val;
     dpnt++;
+    if (byteswap==1) {
+      dpnt->d_tag=bswap_32(dpnt->d_tag);
+      dpnt->d_un.d_val=bswap_32(dpnt->d_un.d_val);
+    }
   };
 
   if (!strtab_val)