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Fix some unused DT_ warnings

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* DT_PLTGOT - ignored for non-mips
 * DT_RELCOUNT/RELACOUNT - ignored
 * DT_RELENT/RELAENT - sanity checks
 * DT_SYMENT - sanity check
 * DT_SONAME - ignore for now.

Bug: 18186310

(cherry picked from commit 4a6e9a835a84aca965f0170f604381dae7f130be)

Change-Id: Ib40095f0770d65628fc7abac5a471378de35ebe7
This commit is contained in:
Dmitriy Ivanov 2014-09-16 15:51:25 -07:00
parent b364d95380
commit 634a045c5c
1 changed files with 35 additions and 4 deletions
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39
linker/linker.cpp
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@ -1875,6 +1875,10 @@ bool soinfo::PrelinkImage() {
DEBUG("d = %p, d[0](tag) = %p d[1](val) = %p",
d, reinterpret_cast<void*>(d->d_tag), reinterpret_cast<void*>(d->d_un.d_val));
switch (d->d_tag) {
case DT_SONAME:
// TODO: glibc dynamic linker uses this name for
// initial library lookup; consider doing the same here.
break;
case DT_HASH:
nbucket = reinterpret_cast<uint32_t*>(load_bias + d->d_un.d_ptr)[0];
nchain = reinterpret_cast<uint32_t*>(load_bias + d->d_un.d_ptr)[1];
@ -1887,6 +1891,12 @@ bool soinfo::PrelinkImage() {
case DT_SYMTAB:
symtab = reinterpret_cast<ElfW(Sym)*>(load_bias + d->d_un.d_ptr);
break;
case DT_SYMENT:
if (d->d_un.d_val != sizeof(ElfW(Sym))) {
DL_ERR("invalid DT_SYMENT: %d", d->d_un.d_val);
return false;
}
break;
#if !defined(__LP64__)
case DT_PLTREL:
if (d->d_un.d_val != DT_REL) {
@ -1909,12 +1919,13 @@ bool soinfo::PrelinkImage() {
plt_rel_count = d->d_un.d_val / sizeof(ElfW(Rel));
#endif
break;
#if defined(__mips__)
case DT_PLTGOT:
#if defined(__mips__)
// Used by mips and mips64.
plt_got = reinterpret_cast<ElfW(Addr)**>(load_bias + d->d_un.d_ptr);
break;
#endif
// Ignore for other platforms... (because RTLD_LAZY is not supported)
break;
case DT_DEBUG:
// Set the DT_DEBUG entry to the address of _r_debug for GDB
// if the dynamic table is writable
@ -1935,6 +1946,15 @@ bool soinfo::PrelinkImage() {
case DT_RELASZ:
rela_count = d->d_un.d_val / sizeof(ElfW(Rela));
break;
case DT_RELAENT:
if (d->d_un.d_val != sizeof(ElfW(Rela))) {
DL_ERR("invalid DT_RELAENT: %d", d->d_un.d_val);
return false;
}
break;
case DT_RELACOUNT:
// ignored (see DT_RELCOUNT comments for details)
break;
case DT_REL:
DL_ERR("unsupported DT_REL in \"%s\"", name);
return false;
@ -1948,6 +1968,19 @@ bool soinfo::PrelinkImage() {
case DT_RELSZ:
rel_count = d->d_un.d_val / sizeof(ElfW(Rel));
break;
case DT_RELENT:
if (d->d_un.d_val != sizeof(ElfW(Rel))) {
DL_ERR("invalid DT_RELENT: %d", d->d_un.d_val);
return false;
}
break;
case DT_RELCOUNT:
// "Indicates that all RELATIVE relocations have been concatenated together,
// and specifies the RELATIVE relocation count."
//
// TODO: Spec also mentions that this can be used to optimize relocation process;
// Not currently used by bionic linker - ignored.
break;
case DT_RELA:
DL_ERR("unsupported DT_RELA in \"%s\"", name);
return false;
@ -2007,8 +2040,6 @@ bool soinfo::PrelinkImage() {
break;
#if defined(__mips__)
case DT_STRSZ:
case DT_SYMENT:
case DT_RELENT:
break;
case DT_MIPS_RLD_MAP:
// Set the DT_MIPS_RLD_MAP entry to the address of _r_debug for GDB.