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PPC branch+call trick: filter first 4MB only

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filteri.cpp filter/ppcbxx.h stub/ppc_bxx.S

committer: jreiser <jreiser> 1114229877 +0000
This commit is contained in:
John Reiser
2005-04-23 04:17:57 +00:00
parent d339ee3135
commit c282e7fdb4
3 changed files with 21 additions and 9 deletions
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src/filter/ppcbxx.h
+6 -5
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@@ -47,7 +47,8 @@ static int F(Filter *f)
// scan
const upx_byte *b = f->buf;
#endif
const unsigned size = f->buf_len;
const unsigned size = umin(f->buf_len, -(~0u<<(32 - (6+ W_CTO))));
const unsigned size4 = size -4;
unsigned ic;
unsigned calls = 0, noncalls = 0;
@@ -62,7 +63,7 @@ static int F(Filter *f)
memset(buf , 0, WW);
memset(buf + WW, 1, 256 - WW);
for (ic = 0; ic < size - 4; ic+=4) if (COND(b,ic)) {
for (ic = 0; ic<=size4; ic+=4) if (COND(b,ic)) {
unsigned const off = (int)(get_be32(b+ic)<<6) >>6;
if (size <= (off & (~0u<<2))+ic) {
buf[(~(~0u<<W_CTO)) & (off>>(26 - W_CTO))] |= 1;
@@ -81,7 +82,7 @@ static int F(Filter *f)
const unsigned cto = (unsigned)f->cto << (24+2 - W_CTO);
#endif
for (ic = 0; ic < size - 4; ic+=4) if (COND(b,ic)) {
for (ic = 0; ic<=size4; ic+=4) if (COND(b,ic)) {
unsigned const word = get_be32(b+ic);
unsigned const off = (int)(word<<6) >>6;
unsigned const jc = (off & (~0u<<2))+ic;
@@ -121,12 +122,12 @@ static int F(Filter *f)
static int U(Filter *f)
{
upx_byte *b = f->buf;
const unsigned size4 = f->buf_len - 4;
const unsigned size4 = umin(f->buf_len - 4, -(~0u<<(32 - (6+ W_CTO))));
const unsigned addvalue = f->addvalue;
unsigned ic;
for (ic = 0; ic < size4; ic+=4) if (COND(b,ic)) {
for (ic = 0; ic<=size4; ic+=4) if (COND(b,ic)) {
unsigned const word = get_be32(b+ic);
if ((~(~0u<<W_CTO) & (word>>(24+2 - W_CTO))) == f->cto) {
unsigned const jc = word & (~(~0u<<(26 - W_CTO)) & (~0u<<2));