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arm-linux.shlib escape hatch: munmap temporary pages

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This commit is contained in:
John Reiser
2009-10-21 09:32:42 -07:00
parent d8ed259bce
commit 4e1c342e55
6 changed files with 2020 additions and 2002 deletions
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src/p_lx_elf.cpp
+12 -9
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@@ -1671,6 +1671,9 @@ void PackLinuxElf32::pack1(OutputFile */*fo*/, Filter &/*ft*/)
while (x>>=1) {
++lg2_page;
}
if (hatch_off < 16 && Elf32_Ehdr::EM_ARM==e_machine) {
hatch_off = get_te32(&phdr->p_offset) + get_te32(&phdr->p_memsz);
}
}
}
page_size = 1u<<lg2_page;
@@ -2269,10 +2272,10 @@ void PackLinuxElf32::pack4(OutputFile *fo, Filter &ft)
fo->seek(0, SEEK_SET);
if (0!=xct_off) { // shared library
ehdri.e_ident[0+hatch_off] = 0xcd; // INT 0x80 (syscall [munmap])
ehdri.e_ident[1+hatch_off] = 0x80;
ehdri.e_ident[2+hatch_off] = 0x61; // POPA
ehdri.e_ident[3+hatch_off] = 0xc3; // RET
ehdri.e_ident[12] = 0xcd; // INT 0x80 (syscall [munmap])
ehdri.e_ident[13] = 0x80;
ehdri.e_ident[14] = 0x61; // POPA
ehdri.e_ident[15] = 0xc3; // RET
fo->rewrite(&ehdri, sizeof(ehdri));
fo->rewrite(phdri, e_phnum * sizeof(*phdri));
}
@@ -2328,11 +2331,11 @@ void PackLinuxElf64::pack4(OutputFile *fo, Filter &ft)
fo->seek(0, SEEK_SET);
if (0!=xct_off) { // shared library
ehdri.e_ident[0+hatch_off] = 0x0f; // syscall [munmap]
ehdri.e_ident[1+hatch_off] = 0x05;
ehdri.e_ident[2+hatch_off] = 0x5f; // pop %rdi (arg1)
ehdri.e_ident[3+hatch_off] = 0x5e; // pop %rsi (arg2)
ehdri.e_ident[4+hatch_off] = 0xc3; // RET
ehdri.e_ident[11] = 0x0f; // syscall [munmap]
ehdri.e_ident[12] = 0x05;
ehdri.e_ident[13] = 0x5f; // pop %rdi (arg1)
ehdri.e_ident[14] = 0x5e; // pop %rsi (arg2)
ehdri.e_ident[15] = 0xc3; // RET
fo->rewrite(&ehdri, sizeof(ehdri));
fo->rewrite(phdri, e_phnum * sizeof(*phdri));
}