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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/stub/ppc_bxx.S
+7 -2
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@@ -36,8 +36,13 @@ ppcbxx: # (*f_unf)(xo->buf, out_len, h.b_cto8, h.b_ftid);
#define ptr0 a4
cmpli cr0,ftid,0xd0; bnelr- cr0 # if (0xd0!=ftid) return;
rlwinm. len,len,32-2,2,31; beqlr- cr0 # if (0==(len>>=2)) return;
cmpli cr0,ftid,0xd0; bnelr- cr0 # if (0xd0!=ftid) return;
rlwinm. len,len,32-2,2,31; beqlr- cr0 # if (0==(len>>=2)) return;
lis r0,-(~0<<(32-16- (2+6+ W_CTO))) # limit in 32-bit words
cmpl cr0,len,r0
blt cr0,L5
mr len,r0
L5:
addi cto8,cto8,18<<W_CTO # cat(bxx_opcode, cto8)
movr ptr0,ptr # save base address
addi ptr,ptr,-4 # prepare for 'lwzu'