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use separate stub/armeb-linux.elf-entry and fold

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This commit is contained in:
John Reiser
2006-11-20 08:02:28 -08:00
parent 2f483ec8e8
commit 796d58867b
7 changed files with 35 additions and 156 deletions
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src/p_lx_elf.cpp
+18 -140
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@@ -711,78 +711,27 @@ static const
static const
#include "stub/arm-linux.elf-fold.h"
static const
#include "stub/armeb-linux.elf-entry.h"
static const
#include "stub/armeb-linux.elf-fold.h"
#include "mem.h"
static void brev(
unsigned char *const dst,
unsigned char const *const src,
unsigned len
)
{
assert(0==(3 & len));
// Detect overlap which over-writes src before it is used.
assert(!((4+ src)<=dst && dst < (len + src)));
for (unsigned j = 0; j < len; j += 4) {
// Simple way (and somewhat slow) to allow in-place brev().
unsigned char tmp[4];
memcpy(tmp, j + src, 4);
dst[0+ j] = tmp[3];
dst[1+ j] = tmp[2];
dst[2+ j] = tmp[1];
dst[3+ j] = tmp[0];
}
}
static void
ehdr_bele(Elf_BE32_Ehdr *const ehdr_be, Elf_LE32_Ehdr const *const ehdr_le)
{
memcpy(&ehdr_be->e_ident, &ehdr_le->e_ident, sizeof(ehdr_be->e_ident));
ehdr_be->e_ident[Elf32_Ehdr::EI_DATA] = Elf32_Ehdr::ELFDATA2MSB;
ehdr_be->e_type = ehdr_le->e_type;
ehdr_be->e_machine = ehdr_le->e_machine;
ehdr_be->e_version = ehdr_le->e_version;
ehdr_be->e_entry = ehdr_le->e_entry;
ehdr_be->e_phoff = ehdr_le->e_phoff;
ehdr_be->e_shoff = ehdr_le->e_shoff;
ehdr_be->e_flags = ehdr_le->e_flags;
ehdr_be->e_ehsize = ehdr_le->e_ehsize;
ehdr_be->e_phentsize = ehdr_le->e_phentsize;
ehdr_be->e_phnum = ehdr_le->e_phnum;
ehdr_be->e_shentsize = ehdr_le->e_shentsize;
ehdr_be->e_shnum = ehdr_le->e_shnum;
ehdr_be->e_shstrndx = ehdr_le->e_shstrndx;
}
static void
ehdr_lebe(Elf_LE32_Ehdr *const ehdr_le, Elf_BE32_Ehdr const *const ehdr_be)
{
memcpy(&ehdr_le->e_ident, &ehdr_be->e_ident, sizeof(ehdr_le->e_ident));
ehdr_le->e_ident[Elf32_Ehdr::EI_DATA] = Elf32_Ehdr::ELFDATA2LSB;
ehdr_le->e_type = ehdr_be->e_type;
ehdr_le->e_machine = ehdr_be->e_machine;
ehdr_le->e_version = ehdr_be->e_version;
ehdr_le->e_entry = ehdr_be->e_entry;
ehdr_le->e_phoff = ehdr_be->e_phoff;
ehdr_le->e_shoff = ehdr_be->e_shoff;
ehdr_le->e_flags = ehdr_be->e_flags;
ehdr_le->e_ehsize = ehdr_be->e_ehsize;
ehdr_le->e_phentsize = ehdr_be->e_phentsize;
ehdr_le->e_phnum = ehdr_be->e_phnum;
ehdr_le->e_shentsize = ehdr_be->e_shentsize;
ehdr_le->e_shnum = ehdr_be->e_shnum;
ehdr_le->e_shstrndx = ehdr_be->e_shstrndx;
}
void
PackLinuxElf32armBe::buildLoader(Filter const *ft)
{
ARM_buildLoader(ft, true);
buildLinuxLoader(
linux_elf32armeb_loader, sizeof(linux_elf32armeb_loader),
linux_elf32armeb_fold, sizeof(linux_elf32armeb_fold), ft);
}
void
PackLinuxElf32armLe::buildLoader(Filter const *ft)
{
ARM_buildLoader(ft, false);
buildLinuxLoader(
linux_elf32arm_loader, sizeof(linux_elf32arm_loader),
linux_elf32arm_fold, sizeof(linux_elf32arm_fold), ft);
}
static const
@@ -1222,37 +1171,20 @@ void PackBSDElf32x86::pack1(OutputFile *fo, Filter &ft)
generateElfHdr(fo, bsd_i386elf_fold, getbrk(phdri, get_native16(&ehdri.e_phnum)) );
}
void PackLinuxElf32::ARM_pack1(OutputFile *fo, bool const isBE)
{
Elf32_Ehdr const *const fold = (Elf32_Ehdr const *)&linux_elf32arm_fold;
cprElfHdr3 h3;
// We need Elf32_Ehdr and Elf32_Phdr with byte gender of target.
// The stub may have been compiled differently.
if (this->ei_data==fold->e_ident[Elf32_Ehdr::EI_DATA]) {
memcpy(&h3, (void const *)linux_elf32arm_fold,
sizeof(Elf32_Ehdr) + 2*sizeof(Elf32_Phdr) );
}
else {
(isBE ? (void (*)(void *, void const *))ehdr_bele
: (void (*)(void *, void const *))ehdr_lebe)
((void *)&h3.ehdr, (void const *)linux_elf32arm_fold);
brev((unsigned char *)&h3.phdr[0],
sizeof(Elf32_Ehdr) + (unsigned char const *)&linux_elf32arm_fold,
3*sizeof(Elf32_Phdr) );
}
generateElfHdr(fo, &h3, getbrk(phdri, get_native16(&ehdri.e_phnum)) );
}
void PackLinuxElf32armLe::pack1(OutputFile *fo, Filter &ft)
{
super::pack1(fo, ft);
ARM_pack1(fo, false);
cprElfHdr3 h3;
memcpy(&h3, linux_elf32arm_fold, sizeof(Elf32_Ehdr) + 2*sizeof(Elf32_Phdr));
generateElfHdr(fo, &h3, getbrk(phdri, get_native16(&ehdri.e_phnum)) );
}
void PackLinuxElf32armBe::pack1(OutputFile *fo, Filter &ft) // FIXME
void PackLinuxElf32armBe::pack1(OutputFile *fo, Filter &ft)
{
super::pack1(fo, ft);
ARM_pack1(fo, true);
cprElfHdr3 h3;
memcpy(&h3, linux_elf32armeb_fold, sizeof(Elf32_Ehdr) + 2*sizeof(Elf32_Phdr));
generateElfHdr(fo, &h3, getbrk(phdri, get_native16(&ehdri.e_phnum)) );
}
void PackLinuxElf32ppc::pack1(OutputFile *fo, Filter &ft)
@@ -1511,60 +1443,6 @@ PackLinuxElf32armLe::getFilters() const
return ARM_getFilters(false);
}
void
PackLinuxElf32::ARM_buildLoader(const Filter *ft, bool const isBE)
{
unsigned const sz_loader = sizeof(linux_elf32arm_loader);
unsigned const sz_fold = sizeof(linux_elf32arm_fold);
// Was ARM stub assembled for same endianness as the target?
bool const asm_brev = (this->ei_data
!= ((Elf32_Ehdr const *)linux_elf32arm_fold)->e_ident[Elf32_Ehdr::EI_DATA] );
MemBuffer tmp_fold(sz_fold);
memcpy(tmp_fold, linux_elf32arm_fold, sz_fold);
// 0xe3530050 is "cmp fid,#0x50" with fid .req r3
if (isBE) { // change filter 0x50 to filter 0x51
checkPatch(NULL,0,0,0); // reset
if (!asm_brev) { // find 0xe3530050 big-endian
patch_be32(tmp_fold, sz_fold, "\xe3\x53\x00\x50", 0xe3530051);
}
else { // find 0xe3530050 little-endian
patch_le32(tmp_fold, sz_fold, "\x50\x00\x53\xe3", 0xe3530051);
}
checkPatch(NULL,0,0,0); // reset
}
if (!asm_brev) { // was assembled to match target
buildLinuxLoader(linux_elf32arm_loader, sz_loader,
tmp_fold, sz_fold, ft );
}
else { // was assembled brev() from target
// linux_elf32arm_loader[] is all instructions, except for two strings
// at the end: the copyright message, and the SELinux message.
// The copyright message begins and ends with '\n', and the SELinux
// message ends with '\n'. So copy back to the third '\n' from the end,
// and apply brev() only before that point.
MemBuffer brev_loader(sz_loader);
int nl = 0;
int j;
for (j= sz_loader; --j>=0; ) {
unsigned char const c = linux_elf32arm_loader[j];
brev_loader[j] = c;
if ('\n'==c) {
if (3==++nl) {
break;
}
}
}
brev(brev_loader, linux_elf32arm_loader, j);
(isBE ? (void (*)(void *, void const *))ehdr_bele
: (void (*)(void *, void const *))ehdr_lebe)
(tmp_fold.getVoidPtr(), (void const *)linux_elf32arm_fold);
buildLinuxLoader(brev_loader, sz_loader, tmp_fold, sz_fold, ft);
}
}
void PackLinuxElf32::ARM_defineSymbols(Filter const * /*ft*/)
{
unsigned const hlen = sz_elf_hdrs + sizeof(l_info) + sizeof(p_info);