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amd64 stub: fix length of move for non-small programs

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This commit is contained in:
John Reiser
2006-10-04 08:38:06 -07:00
parent 610fd7561b
commit 014236c861
4 changed files with 443 additions and 449 deletions
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src/p_lx_elf.cpp
+9 -4
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@@ -589,7 +589,7 @@ PackLinuxElf64amd::defineSymbols(Filter const *)
adrx = adru + hlen;
lenm = PAGE_SIZE + len;
lenu = PAGE_SIZE + len;
cntc = len >> 3;
cntc = len >> 3; // over-estimate; corrected at runtime
}
else {
adrm = lo_va_stub + len;
@@ -603,14 +603,19 @@ PackLinuxElf64amd::defineSymbols(Filter const *)
adrm = PAGE_MASK & (~PAGE_MASK + adrm); // round up to page boundary
adrc = PAGE_MASK & (~PAGE_MASK + adrc); // round up to page boundary
//avoid circularity linker->defineSymbol("LENX", sz_pack2 - hlen);
linker->defineSymbol("ADRX", adrx); // compressed input for eXpansion
linker->defineSymbol("CNTC", cntc); // count for copy
// For actual moving, we need the true count, which depends on sz_pack2
// and is not yet known. So the runtime stub detects "no move"
// if adrm==adrc, and otherwise uses actual sz_pack2 to compute cntc.
//linker->defineSymbol("CNTC", cntc); // count for copy
linker->defineSymbol("LENU", lenu); // len for unmap
linker->defineSymbol("ADRC", adrc); // addr for copy
linker->defineSymbol("ADRU", adru); // addr for unmap
linker->defineSymbol("JMPU", 12 + lo_va_user); // trampoline for unmap
#define EI_NIDENT 16 /* <elf.h> */
linker->defineSymbol("JMPU", EI_NIDENT -4 + lo_va_user); // unmap trampoline
#undef EI_NIDENT
linker->defineSymbol("LENM", lenm); // len for map
linker->defineSymbol("ADRM", adrm); // addr for map
#undef PAGE_SIZE